机械5

摘要 本次设计的题目是CA6140车床法兰盘的工艺规程和夹具设计，主要内容如下： 首先，对零件进行分析，主要是零件作用的分析和工艺性分析，通过零件分析可以了解零件的基本情况，而工艺分析可以知道零件的加工表面和加工要求。根据零件图提出的加工要求，确定毛坯的制造形式和尺寸。 其次，进行基面的选择，确定加工过程中的粗基准和精基准。根据选好的基准，制订工艺路线，通常制订两种以上的工艺路线，通过工艺方案的比较与分析，再选择可以使零件的几何形状、尺寸精度及位置精度等技术要求得到合理的保证的一种较佳工序路线。 然后，根据已经选定的工序路线，确定每一步的切削用量及基本工时，并选择合适的机床和刀具和量具。 最后，设计车φ100大法兰端面和φ20 0+0.045孔夹具。设计车床夹具，首先要仔细分析被加工零件的技术要求，运用夹具设计的基本原理和方法，拟定夹具设计方案；在满足加工精度的条件下，合理的进行安装、定位、夹紧；在完成夹具草图后，进一步考虑零件间的连接关系和螺钉、螺母、定位销等的固定方式，设计合理的结构实现各零部件间的相对运动；根据各零件的使用要求，选择相应的材料。 完成车床夹具的所有设计后，用AutoCAD进行二维图形的绘制，首先画装配图，然后从装配图上拆画零件图，标注相关尺寸及技术要求；再画出三维模型图，最后进行的撰写、整理、修改完成该设计。 关键词：机械，法兰盘，加工工艺，夹具设计 ABSTRACT The title of this desig
n is the process specificatio
n a
nd fixture desig
n of﹥ CA6140 lathe fla
nge, the mai
n co
nte
nts are as follows: First of all, the a
nalysis of parts, mai
nly the a
nalysis of the role of parts a
nd process a
nalysis, through the a
nalysis of parts ca
n u
ndersta
nd the basic situatio
n of parts, a
nd process a
nalysis ca
n k
now the processi
ng surface a
nd processi
ng requireme
nts of parts. Accordi
ng to the processi
ng requireme
nts of the part drawi
ng, the ma
nufacturi
ng form a
nd size of the bla
nk are determi
ned. Seco
ndly, the selectio
n of base pla
ne is carried out to determi
ne the rough a
nd fi
ne datum i
n the machi
ni
ng process. Accordi
ng to the selected be
nchmark, the process route isworked out. Usually, two or more process routes areworked out. Through the compariso
n a
nd a
nalysis of process schemes, a better process route ca
n be selected to e
nsure the geometric shape, dime
nsio
nal accuracy a
nd positio
n accuracy of parts. The
n, accordi
ng to the selected process route, determi
ne the cutti
ng parameters a
nd basicworki
ng hours of each step, a
nd select the appropriate machi
ne tools, cutti
ng tools a
nd measuri
ng tools. Fi
nally, the fixture for tur
ni
ng the large fla
nge e
nd face ofφ 100 a
nd the hole ofφ 200+ 0.045 is desig
ned. To desig
n the lathe fixture, first of all,we should carefully a
nalyze the tech
nical requireme
nts of the parts to be processed, a
nd use the basic pri
nciples a
nd methods of fixture desig
n to draw up the fixture desig
n scheme; u
nder the co
nditio
n of meeti
ng the processi
ng accuracy, reaso
nable i
nstallatio
n, positio
ni
ng a
nd clampi
ng are carried out; after completi
ng the fixture sketch, the co
n
nectio
n relatio
nship betwee
n parts a
nd the fixi
ng methods of screws,
nuts a
nd positio
ni
ng pi
ns are further co
nsidered to desig
n The reaso
nable structure ca
n realize the relative moveme
nt betwee
n the parts, a
nd select the correspo
ndi
ng materials accordi
ng to the use requireme
nts of each part. After fi
nishi
ng all the desig
n of the lathe fixture, AutoCAD is used to draw two-dime
nsio
nal graphics. First, draw the assembly drawi
ng, the
n draw the part drawi
ng from the assembly drawi
ng, a
nd mark the releva
nt dime
nsio
ns a
nd tech
nical requireme
nts; the
n draw the three-dime
nsio
nal model drawi
ng; fi
nally,write, sort out a
nd modify the paper to complete the desig
n. Keywords: machi
nery, fla
nge, processi
ng tech
nology, fixture desig
n 目录 摘要I ABSTRACT II 第1章绪论1 第2章零件的结构工艺性分析2 2.1零件的作用2 2.2零件的工艺性分析2 第3章工艺规程设计4 3.1确定毛坯的制造形式4 3.2基准的选择4 3.2.1粗基准的选择4 3.2.2精基准的选择5 3.3工艺路线的拟定5 3.3.1选择加工方法5 3.3.2划分加工阶段6 3.3.3安排加工顺序6 3.5确定切削用量及基本工时12 第5章车床夹具设计17 5.1生产条件17 5.2零件工艺分析17 5.3夹具结构设计18 5.3.1夹紧机构20 5.3.2导向装置的选择21 5.3.3机床夹具的总体形式22 5.4绘制夹具零件图23 5.5绘制夹具装配图24 5.6误差分析26 5.6.1定位误差26 5.6.2产生定位误差的原因27 5.7定位误差的计算27 结论29 致谢30 参考文献32