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机械加工工艺规程的制定 *题答案

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living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical industry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, River waste, beginning of river e col ogical rest oration effects.

"Thr ee modified a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted Cit y i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level build a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of the industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow quali t y. "Small" is reflected in smaller, spe cialize d cooperatives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no const ructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farm ers continued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha sis on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

第一章 机械加工工艺规程的制定*题答案
一、填空题
1、生产过程包括:技术准备过程、生产过程、辅助生产过程、生产服务四过程。在生 产过程中与机械加工有关的过程称为机械加工工艺过程,其文件固定形式称为机械加工工 艺规程。
2、零件的机械加工工艺过程由若干个工序所组成;在每一个工序中可以包含一个或几 个工步;又可以包含一个或几个安装,在每一个安装中可以包含一个或几个工位,每一个工 位可能包含一个或几个工作行程。工序是依据 工作地点是否变化和工作过程是否连续 来划分的。
3、获得尺寸精度的方法有:试切法、调整法、定尺寸法和自动控制法。 4、机械加工中常用的毛坯有:铸件、锻件、型材、焊接件、冷冲压件毛坯和其它形式 的毛坯。 5、根据基础基准的应用场合和作用不同,基准可分为:设计基准和工艺基准两大类。 而工艺基准又可分为:工序基准、定位基准、测量基准和装配基准。 6、精基准的选择原则有:基准重合原则、基准统一原则、作为定位基准应保证工件定位准 确,夹紧可靠,夹具结构简单,操作方便、互为基准原则、自为基准原则。 7、在机械加工中,零件的加工阶段通常有:粗加工阶段、半精加工阶段、精加工阶段 和光整加工阶段四个加工阶段。 8、机械加工中的预备热处理方法有:退火、正火、调质和时效处理四种。 9、机械加工中的最终热处理方法有:淬火、渗碳淬火和氮化处理三种。 10、在安排机械加工顺序时,一般应遵循的有:“先粗后精” 原则、 “先主后次” 原则 、 “先基面后其它”原则 和“先面后孔”的原则。 11、加工余量可分为 工序余量 和 总加工余量 。 12、标注工序尺寸公差时,一般毛坯尺寸公差采用 双向对称标注 ;最后一道工序标 注设计尺寸公差;而中间工序的工序尺寸公差一般按 “入体”原则 标注;即对包容表面(孔), 其基本尺寸是 最小工序尺寸 ,公差表现为 上偏差 ;对被包容表面(轴),其基本尺寸 是最大工序尺寸,公差表现为 下偏差 。 13、尺寸链由 环 组成,根据其性质不同可以将尺寸环分为 组成环对封闭环 ;而根 据 组成环 对 封闭环 的影响情况不同,又可以将 组成环 分为 增环 和 减环 。 14、确定加工余量的方法有:经验估计法、查表修正法 和 分析计算法 三种,工序尺 寸的确定除与设计尺寸、加工余量有关外,还与基准确定、转化有关,其解算方法有 极值 法 和 概率法 两种。 15、在机械加工中,缩短基本时间的工艺措施有: 提高切削用量、缩短切削行程 和 采用高生产率的加工方法 等措施。 16、工艺成本是指生产成本中与工艺过程 直接有关 的那一部分成本,一般分为:可变 费用 和 不变费用 两种。 二、问答题

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the flood of scie ntific e noug h, before the treatment a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d work i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to reconstructi on of old re side ntial areas , urban village s, s hanty tow ns a nd promote poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em -ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "three agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cultural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agriculture a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ur al infrastructure, e nha nce food production capacity, improve t he qualit y of agricultural product s, effectively "steady increa se of grain" and mai ntain "tong ue." Se cond, i ndustry convergence articl e. Enhance the level of concentration, inte nsificati on of ag ricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural product i on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd tourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel

living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical industry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, River waste, beginning of river e col ogical rest oration effects.

"Three modif ied a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted City i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level build a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of the industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow qualit y. "Sma ll" is reflected in smaller, spe cialize d cooperatives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no constructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farmers cont inued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha si s on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

1、什么是生产过程和工艺过程。 答:生产过程:由原材料到成品之间的各有关劳动过程的总和。
工艺过程:在生产过程中,那些与由原材料转变为产品直接相关的过程。它包括毛 坯制造、零件加工、热处理、质量检验和机器装配等。
2、试述分析零件技术要求时需要考虑哪些因素? 答: ① 精度分析。主要精加工表面的尺寸精度,形状和位置精度的分析,一般尺寸精 度取决于加工方法,位置精度决定于安装方法和加工顺序。
② 表面粗糙度及其它表面质量要求分析。 ③ 热处理要求及其有关材质性能分析。 ④ 其它技术要求(如动*衡、去磁等)的分析。 3、选择毛坯种类时,一般应考虑哪些因素? 答:① 设计图纸规定的材料及机械性能; ② 零件的结构形状及外形尺寸; ③ 零件制造经济性; ④ 生产类型; ⑤ 现有生产条件; ⑥ 充分考虑利用新技术、新工艺和新材料。 4、在确定表面加工方法时,需考虑哪几方面的因素? 答:① 被加工表面的几何特征。 ② 被加工表面的技术要求。 ③ 零件结构形状和尺寸大小。 ④ 生产纲领和投产批量。 ⑤ 工厂现有设备能力、技术条件及设备负荷的*衡。 5、在机械加工过程中,为什么要划分加工阶段? 答:① 便于保证加工质量。 ② 有利于合理使用机床设备。 ③ 便于安排热处理工序。 ④ 粗、精加工分开,便于及时发现毛坯缺陷。 ⑤ 精加工集中在后面进行,还能减少加工表面在运输中受到损伤。 6、在机械加工过程中,通常在哪些场合需要安排检验工序? 答:在机械加工过程中,通常在下列场合应安排检验工序: ① 粗加工全部结束后精加工之前; ② 转入外车间加工之前; ③ 花费工时多的工序和重要工序的前后; ④ 最终加工之后。 7、什么是封闭环?它有何特点? 答:封闭环是指在装配或加工过程中间接获得的一尺寸环。特点是: ① 它是尺寸链中最后形成的环,而且不是直接获得的尺寸;

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the flood of scie ntific e noug h, before the treatm ent a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d wor k i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to recon structi on of old re side ntial areas , urban village s, s hanty tow ns a nd promote poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em-ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "t hree agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cult ural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agricult ure a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ural infrastructure, e nha nce food production capacity, im prove t he qualit y of agricultural product s, effectively "steady increase of grain" and mai ntain "tong ue." Se cond, i ndustry co nvergence articl e. Enhance the level of concentration, inte nsificati on of agricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural producti on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd t ourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel

living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical in dustry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, Riv er waste, beginning of river e col ogical rest oration effects.

"Three modified a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted City i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level buil d a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of t he industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow qualit y. "Small" is reflected in smaller, spe cialize d cooper atives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no constructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farmers continued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha sis on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

② 其它各环的变化对它均有影响。

8、什么是工序尺寸?其公差的标注原则是什么?

答:工序尺寸是指各工序加工过程中应该保证的尺寸。

其公差标注原则是:标注公差时,毛坯尺寸公差一般采用双向对称标注;最后一道工序

即标注的该表面的设计尺寸公差;而中间工序的工序尺寸公差一般按“入体”原则标注;即

对包容表面(孔),其基本尺寸是最小工序尺寸,公差表现为上偏差;对被包容表面(轴),

其基本尺寸是最大工序尺寸,公差表现为下偏差。

9、什么是尺寸链?它有何特征?

答:尺寸链是在机器装配或零件机械加工过程中,由若干个相互关联尺寸所形成的尺寸封闭

形式。尺寸链的主要特征为:①封闭性:② 关联性

三、分析题

1、成批生产如图 1-1 所示零件的阶梯轴,试按表中的加工顺序将其工序、安装、工位、工步

用数码区分开。

顺序

加工内容

工序

安装

工位

工步

1

切一端面

2

打中心孔

3

切另一端面



2次

2个

4个

4

打另一中心孔

5

车大外圆

6

大外圆倒角

7

车小外圆



2次

2个

4个

8

小外圆倒角

9

铣键槽

10 去毛刺



1次

1个

1个



1次

1个

1个

图 1-1 2、如图 1-2 所示零件,若按调整法加工时, 试在图中指出:⑴ 加工*面 2 时的设计基 准、定位基准、工序基准和测量基准;⑵ 镗 孔 4 时的设计基准、定位基准、工序基准和 测量基准。 答:⑴ 加工*面 2 时的设计基准是 3;定位 基准是 1、6;工序基准是 1;测量基准 1; ⑵ 镗孔 4 时的设计基准是 5、6;定位基准是 1、6;

图 1-2

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the f lood of scie ntific e noug h, before the treatment a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d work i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to reconstructi on of old re side ntial areas , urban village s, s hanty tow ns a nd promot e poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em -ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "three agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cultural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agriculture a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ural infrastructure, e nha nce food production capacity, improve t he qualit y of agricultural product s, effectively "steady increase of grain" and mai ntain "tong ue." Se cond, i ndustry convergence articl e. Enhance the level of concentration, inte nsificati on of agricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural producti on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd tourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel

living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical industry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, River waste, beginning of river e col ogical rest oration effects.

"Three modif ied a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted City i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level build a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of the industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow qualit y. "Sma ll" is reflected in smaller, spe cialize d cooperatives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no constructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farmers cont inued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha si s on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

工序基准是 5;测量基准 1。 3、试选择图 1-3 所示端盖零件加工时的粗基准。 答:为了保证非加工表面与加工表面之间的位置关系,应选择外圆柱表面 A 和端面 C 作零 件加工时的粗基准。 4、图 1-4 所示零件为一拨杆,试选择加工Φ 10H7 孔的定位基面。已知条件:其余各被加工 表面均已加工好,毛坯为铸件。 答:图示零件当其余各被加工表面均已加工好时,为“基准重合”,应选择的设计基准孔及 其端面、R25 外圆表面作为加工孔的定位基面。

图 1-3

图 1-4

5、选择在单件小批量生产条件下加工下列表面的加工顺序及采用的机床名称:(方法很多, 仅做参考)

加工表面

加工要求

加工顺序

采用机床

阶梯轴上的外圆

φ 60H6、Ra1.6

粗车-半精车-粗磨-精磨

车床、磨床

盘状齿轮坯的内孔

φ 80H6、Ra0.8

钻孔-扩孔-粗磨-精磨

钻床、磨床

机床床身导轨*面
四、计算分析题

1200×100mm2、Ra0.8

粗刨-精刨-磨削

刨床、磨床

1、一小轴,毛坯为热轧棒料,大量生产的工艺路线为粗车-精车-淬火-粗磨-精磨,外圆设计

尺寸为

?

30

0 ?0.013

,已知各工序的加工余量和经济精度,试确定各工序尺寸及其偏差、毛坯尺

寸及粗车余量,并填入下表:

工序 工序 名称 名称

经济精度

精磨 0.1 0.013(IT6)

粗磨 0.4 0.033(IT8)

工序尺寸 及偏差

?

30

0 ?0.013

? 30.10?0.033

工序 工序 名称 余量

经济精度

工序尺寸 及偏差

粗车 6
毛坯尺 寸

0.21(IT12)

?

32

0 ?

0.21

±1.2

?38 ?1.2

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the flood of scie ntific e noug h, before the treatm ent a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d wor k i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to recon structi on of old re side ntial areas , urban village s, s hanty tow ns a nd promote poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em-ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "t hree agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cult ural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agricult ure a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ural infrastructure, e nha nce food production capacity, im prove t he qualit y of agricultural product s, effectively "steady increase of grain" and mai ntain "tong ue." Se cond, i ndustry co nvergence articl e. Enhance the level of concentration, inte nsificati on of agricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural producti on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd t ourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel

living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical in dustry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, Riv er waste, beginning of river e col ogical rest oration effects.

"Three modified a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted City i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level buil d a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of t he industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow qualit y. "Small" is reflected in smaller, spe cialize d cooper atives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no constructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farmers continued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha sis on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

? 30 .5 精车 1.5

0.084 (IT10)

0 ? 0.084

2、加工图 1-5 所示零件,A 为设计基准, B 为测量基准, 按极值法计算 A2 及其偏差。 解:根据题意判断尺寸“26±0.05”为封闭环(不好测量 的尺寸),作出尺寸链图如下:

A0 = 26±0.05;A1 =

36

0 ?

0.06

;A2

=



用极值法和竖式法均可解出。

基本尺寸 上偏差 下偏差

增环: A1 36

0

减环: A2 -10

+0.050

封闭环: A0 26

+0.050

所以:A2

=

10 ?0.01 ? 0.05

-0.06 +0.01 -0.05

图 1-5

3、图 1-6 所示工件,如先以 A 面定位加工 C 面,得尺寸 A1;然后再以 A 面定位用调整法 加工台阶面 B,得尺寸 A2,要求保证 B 面与 C 面间尺寸 A0。试求工序尺寸 A2。

图 1-6

解:根据题意判断尺寸“

25

?0.25 0

”为封闭环(不好测量的尺寸),作出尺寸链图如上

A0

=

25

?0.25 0

;A1

=

60

0 ?0.1

;A2

= ? 用竖式法均解。

基本尺寸

上偏差

下偏差

增环: A1

60

0

-0.1

减环: A2

-35

+0.25

+0.1

封闭环: A0

25

+0.25

0

35 所以:A2 =

?0.1 ? 0.25

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the f lood of scie ntific e noug h, before the treatment a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d work i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to reconstructi on of old re side ntial areas , urban village s, s hanty tow ns a nd promot e poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em -ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "three agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cultural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agriculture a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ural infrastructure, e nha nce food production capacity, improve t he qualit y of agricultural product s, effectively "steady increase of grain" and mai ntain "tong ue." Se cond, i ndustry convergence articl e. Enhance the level of concentration, inte nsificati on of agricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural producti on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd tourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel

living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical industry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, River waste, beginning of river e col ogical rest oration effects.

"Three modif ied a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted City i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level build a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of the industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow qualit y. "Sma ll" is reflected in smaller, spe cialize d cooperatives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no constructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farmers cont inued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha si s on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

4、图 1-7 所示零件除φ 25H7 孔外,其他各表 面均已加工。试确定当以 A 面定位加工孔时 φ 25H7 的工序尺寸。 解:当以 A 面定位加工φ 25H7 孔时的工序尺 寸为 A。根据题意分析可知: A0 = 40±0.1, 为尺寸链的封闭环,查找出尺寸链如图所示;

其中尺寸100

0 ?0 .05

为增环,尺寸 A 为减环。则

工序尺寸 A 为:A = 100 -40 = 60 (mm)

图 1-7

ES = -0.0 5 -(-0.1)=0.05(mm)

EI = 0 -(0.1)= -0.1(mm)

答:工序尺寸

A

为:60

0.05 -0.1

mm。

5、图 1-8 为一零件简图。三个圆弧槽的设计基准为母线 A,当圆弧槽加工后,A 点就不存

在。为了测量方便,必须选择母线 B 或内孔母线 C 作为测量基准。试确定在工序图上应标

注的工序尺寸,并确定其测量尺寸。

图 1-8

解: 标注的工序尺寸 A 如图所示。根据题意分析可知:

A0

?

5

?0 0

.5

为尺寸链的封闭环,

查找出尺寸链如图所示;其中尺寸 50

0
?0 .1 为增环,尺寸

A

为减环。则工序尺寸

A

为:

A ? 50 ?5 ? 45

(mm)

ES ? ?0 .1?0 ? ?0 .1 (mm)

EI ? 0 ?0.5 ? ?0.5 (mm)

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the flood of scie ntific e noug h, before the treatm ent a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d wor k i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to recon structi on of old re side ntial areas , urban village s, s hanty tow ns a nd promote poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em-ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "t hree agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cult ural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agricult ure a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ural infrastructure, e nha nce food production capacity, im prove t he qualit y of agricultural product s, effectively "steady increase of grain" and mai ntain "tong ue." Se cond, i ndustry co nvergence articl e. Enhance the level of concentration, inte nsificati on of agricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural producti on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd t ourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel

living standards, poor farmers in les s than com plete eliminati on of 46 00 Yua n, 894 9, 190 08. "Five waters r ule": the County investe d 2.16 9 billi on y uan, similar counti es line the city' s first complete t he 42 km of sew age pi pe netw ork constr uction, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces s uch as el ectroplating, papermaking, chemical in dustry management through verificati on a nd a cceptance of the muni cipal g overnment, t he County removed Black a nd odorous River, Riv er waste, beginning of river e col ogical rest oration effects.

"Three modified a split" as pects : County total demoliti on ill egal area up 2.75 9 million square meters, complete d City is sue d annual task of 153%, s plit against area ranking city se cond; compl eted "three modified" area 4.8 46 million s quare meters, com pleted City i ssue d annua l task of 403%, ranki ng city thir d, whi ch vil lage in the a target compl eted total city ra nking first; County Gover nment

was named city level "three modified a s plit" work adva nce d. T hese a chiev ements are hard w on a nd s hould be appreciate d. H owever, we are fully aware, t he ne w peri od, a nd w ork in t he countryside a nd t he envir onme nt facing hig her sta ndards and requirements, provi ncial party Committee offe red to hig h level buil d a com prehe nsive wel l-off s ociety goal re quire s "no filth, dirty envir onme nt illegal buildi ngs, i nto a well -off"; muni cipal party Committee als o pr oposes t o build i nto the w ell-off benchmark goal s of the city. Compare d with the superi or claim, "South Gate of XX beautiful" goal, my County "San Nong" and e nvironme nt there are a number of weaknesse s and gaps, highlig hted in t he following five as pects : first, agricult ure remaine d "low" pattern. "Low" is refle cted in t he quality and low; s hort, value added of t he industry chai n is low ; 123 fusion yield l ow empl oyee age, l ow qualit y. "Small" is reflected in smaller, spe cialize d cooper atives throughout t he County t here were 3, 396, but on

the scal e of too little. "San" is refle cted in producti on, ma nagement, s ervice s, de centralize d, centralize d, standardiz ed, brand, information and organizati onal l evel is not high. Second, the countryside is still i n "dirty" phase . "Dirty" is dirty of rural sanitati on sit uation has not cha nged. "Chaos" is a village in rural housing construction planning, construction of di sorder, no drawi ngs, no constructi on, no vetting "four no" phenomenon, heap lyi ng there. " Bad" is the weak rural ba se, village g overna nce i s poor. T hirdly, farmers continued t o be "pers istent" look. "Ol d" is aging, rural la bor for ce accounted for 70% over the age of 50. "Big" is that the reform meas ures ground resistance, s uch as the transa ctions of property rights, l and re pla cement; public s ervice supply gap, r ural education, health car e, pe nsi ons a nd other s ervices can not meet the demand still difficult for poverty alleviati on, w ith empha sis on poverty alleviation and 191. "Har d" is a "peasa nts, pea sants . Four water effects still la cks

答:工序尺寸即测量的尺寸为:

A

?

45

?0 .1 ?0 .5

mm。

浇筑混凝土前,应对支架、模板钢筋等进行检查内的杂物上污清理干净同时水湿润。连续采用斜层法全面积一次完成compell ing." Althoug h the "five water treatment" a lot, w ork very har d, but the f lood of scie ntific e noug h, before the treatment a nd water quality improveme nt after the treatment effect is not obvious, county-wi de focus on river st ill largely inferior five wate r, swimming t he River coul d not be f ound. Five i s "three to split" task still l ies a head. Noti ce of st ock there, ne w constr uction di d not rece ive timely treatment every year (such a s ancestral hall a s unaut hori sed re peated), contrary to t he create d work i s very different from the provincial a nd munici pal sta ndar ds. M eanw hile, whe n im plementation is not in pla ce, generally only focus on illegal construction dem olished, faili ng that s plit that is clear, com bine d dem olition, insufficie nt attention to reconstructi on of old re side ntial areas , urban village s, s hanty tow ns a nd promot e poor. To s olve the se pr oblem s, we must enhance t he se nse of respons ibility a nd urgency, i nsist on probl em -ori ented, to take strong measure s, efforts to make up the

"three agricult ure" and "five water treatment", "three to split a" s hort Board, construction of comprehensive safeguards, "Sout h Gate of XX bea utiful" goal of realizi ng.

II, and preci sion Shi policy, a nd manpow er playing good "thre e agricultural" work pr otracted "three agri cult ural" work is do economic s oci al devel opme nt the work of base d, county level s the s ector t o accordi ng to "base d agricultural, a nd a nd manpow er rural, a nd development farmers" of requirement s, insi sted agri cultural r ural base d status not s hake, i nsisted hui nong kulak poli cy not weake ned, insi sted reform innovation test not stop, efforts created new era "three agri cultural" w ork new s ituation. (A) to make agriculture m ore. To establi sh the concept of agriculture ar ound the people demand, and com prehe nsively promote the supply s ide of agricultur e struct ural reform, strive to enhance the qua lity and efficiency of agriculture a nd competitivenes s. Focus i s on doi ng the four articles . One is the stea dy increase of grain

article. Always tig hten the string for food se curit y, "rice bag" catch i n ha nd, t o hold la nd i n the a djustme nt of agricultural pla nting str uct ure in the "red line ." Accel erating the construction of grain ribbons, im proving agri cult ural infrastructure, e nha nce food production capacity, improve t he qualit y of agricultural product s, effectively "steady increase of grain" and mai ntain "tong ue." Se cond, i ndustry convergence articl e. Enhance the level of concentration, inte nsificati on of agricult ure, creati ng pr oduction, pr oce ssi ng, distri buti on, sales a nd service in one of the agricultural industrial chain, to break down t he value chain, impr ove added val ue. Pus hing forwar d "the I nternet + agri cultural" model to impr ove agricultural producti on, ma nagement, a nd service l evel, innovati ng the mode of e -commerce marketing of agricultural product s, solve the difficult pr oblem of sal es of agricultural products . Agriculture a nd tourism, e ducati on, cult ure, health, pension and other dee p integration, develop leis ure,

travel



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