机械5

矫正椅典型零件造型与加工编程 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。 本文主要讲述矫正椅零件的数控加工工艺和编程，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，然后利用UG软件绘制出该零件的三维造型设计，并运用UG软件对零件进行数控编程，最终将程序录入机床，完成该零件的加工。 关键词：数控铣削；工艺设计；加工工艺；三维造型；数控编程 Abstract The programmi
ng of NC machi
ne tools is more complicated tha
n that of ordi
nary machi
ne tools. This is because i
n the process of ge
neral machi
ne tools do
not co
nsider the problem, such as the steps i
n the process ofwork arra
ngeme
nts, the k
nife poi
nt, cha
nge poi
nt a
nd the tool path determi
natio
n problem i
n NC milli
ng, it allwithout exceptio
n i
nto a fixed program co
nte
nt, precisely because of this characteristic for the processi
ng procedures, the correct
ness a
nd ratio
nality of the highly dema
ndi
ng process desig
n, there ca
n be
no mistake, otherwise the processi
ng of qualified parts. The NC machi
ni
ng process a
nd programmi
ng, this paper describes the typical milli
ng parts, through the a
nalysis of the drawi
ngs, determi
ne the cutti
ng process, the cutti
ng tool a
nd the dosage, formulate the parts machi
ni
ng process card a
nd NC machi
ni
ng process card, a
nd the
n use UG software to draw the three-dime
nsio
nal desig
n of the part, a
nd the use of UG software for NC programmi
ng of parts,will eve
ntually complete the program recordi
ng machi
ne, the parts processi
ng. Keywords: NC milli
ng; process desig
n; machi
ni
ng process; 3D modeli
ng; NC programmi
ng 目录 摘要I Abstract II 1.1本课题的目的及意义1 1.2数控加工工艺的特点1 1.3数控加工工艺设计的主要内容2 1.4数控加工工序的设计方法3 第二章零件三维造型设计5 2.1 CAD/CAM的国内外发展5 2.2 UG软件的简介5 2.3 UG的优点6 2.4三维实体造型7 第三章零件的工艺分析13 3.1零件几何要素的分析13 3.2尺寸精度的分析15 3.3形位精度分析15 3.4装夹方案分析15 3.5确定加工工艺方案16 3.4刀具的选择17 3.5切削参数对机械加工的影响18 3.6切削用量的确定原则18 3.7数控加工工艺文件20 第四章基于UG的数控编程与模拟加工22 4.1 CAM编程的一般步骤22 4.2建立几何毛坯和加工坐标系22 4.3后处理30 4.4 NC程序的输出30 总结33 致谢34 参考文献35