机械5

小支架三维造及数控自动编程设计 摘要 数控机床加工程序的编制比普通机床工艺规程编制复杂。这是因为在普通机床的加工工艺中不必考虑的问题，如工序内工步的安排、对刀点、换刀点及走刀路线的确定等问题，在数控铣削加工时，这一切都无例外地都变成了固定的程序内容，正由于这个特点，促使对加工程序的正确性和合理性要求极高，工艺设计不能有丝毫的差错，否则加工不出合格的零件。 本文主要讲述小支架零件的三维造型和数控车削、铣削加工自动编程，通过对零件图纸的分析，确定该零件的加工工艺、刀具、切削用量，制定出该零件的机械加工工艺过程卡片及数控加工工序卡，选择各工序加工设备和工艺装备（刀具、夹具、量具、辅具），确定各工序切削用量及工序尺寸，然后利用CAD软件绘制出该零件的二维图，并对零件进行数控编程。 关键词：三维造型；自动编程；工艺设计；加工工艺；切削用量 Abstract The programmi
ng of NC machi
ne tools is more complicated tha
n that of commo
n machi
ne tools. This is because i
n the ordi
nary machi
ne tool processi
ng tech
nology do
not have to co
nsider the problem, such as theworki
ng procedure of the step arra
ngeme
nt, to the k
nife poi
nt, cha
nge the k
nife poi
nt a
nd the path to determi
ne the problem, i
n the NC milli
ng, all of these have become a fixed program co
nte
nt, it is precisely because of this characteristic, prompti
ng the correct processi
ng program. The requireme
nt of ratio
nality a
nd reaso
nable
ness isvery high, a
nd there must be
no mistake i
n the process desig
n, otherwise the qualified parts ca
n
not be processed. This paper mai
nly describes the three-dime
nsio
nal modeli
ng of small support parts a
nd the automatic programmi
ng of NC tur
ni
ng a
nd milli
ng. Through the a
nalysis of part drawi
ngs, the processi
ng tech
nology, cutti
ng tools a
nd cutti
ng parameters of the parts are determi
ned, the machi
ni
ng process cards a
nd NC machi
ni
ng process cards of the parts areworked out, a
nd the processi
ng equipme
nt a
nd processes are selected. Equipme
nt(cutter, fixture, measuri
ng tool, auxiliary tool), determi
ne the cutti
ng parameters a
nd process size of each process, a
nd the
n use CAD software to draw the two-dime
nsio
nal diagram of the part, a
nd the part of the NC programmi
ng. Keywords: 3D modeli
ng; automatic programmi
ng; process desig
n; processi
ng tech
nology; cutti
ng parameters 目录 摘要I Abstract II 前言1 第一章设计内容总述2 第二章零件三维造型设计及图样分析3 2.1零件图3 2.2零件三维造型设计3 2.3零件材料和结构分析8 2.3.1零件毛坯材料分析8 2.3.2零件结构工艺分析9 2.4装夹方案分析9 2.5加工方法与加工顺序及进给路线分析10 2.5.1加工方法的确定10 2.4.2加工工序选择原则11 2.4.3确定加工方案11 2.6选择数控加工刀具13 2.7选择加工设备13 2.8切削用量的选择14 2.9计算切削用量14 2.10机械加工工艺卡片16 2.11数控加工工序卡片16 第三章零件程序的编制17 3.1编程的分类17 3.2程序的编制17 3.2.1数控车自动编程17 3.2.2数控铣自动编程19 3.2.3程序后处理24 总结25 致谢26 参考文献27