摘  要

目前，零件三维建模及数控铣削加工中普遍采用UG或SolidWorks三维建模和自动编程，目前而数控加工中大多采用手工编程的方法，而手工编程效率低，准确性差.然而UG包含了三维建模和数控铣削编程模块，在对工件的加工过程中，可以利用UG进行数控铣削自动编程。结合UG强大的参数化功能和后处理器支持多种数控机床功能，可迅速自动生成数控代码,缩短编程人员的编程时间,提高程序的正确性和安全性,降低生产成本,提高工作效率。
    本文以加工QQ公仔为例，详细介绍了基于UG的自动编程的方法和创建数控铣床后处理文件的方法,并且单独创建后置处理构造器来生成出符合加工人员实际操作的机床程序。在数控铣床上完成该曲面类的铣削加工，结果表明加工精度符合图纸要求、基于UC的自动编程可以提高NC程序的正确性和安全性、同时还能提高工作效率。
本文主要讲述曲面零件的加工工艺，通过对曲面零件的三维建模并对零件图纸进行工艺分析，然后设计出毛坯，制定出加工工艺路线，分析工序尺寸与确定公差，选择加工设备，再到夹具、刀具、量具的设计，最终编制出零件的数控加工程序，运用程序在数控机床上进行数控加工，最后完成该零件的所有工序，得到合格的零件。
 
关键词：UG；曲面零件；自动编程；工艺分析；加工方案；切削用量；数控编程

Abstract

At present, UG or Mastercam automatic programming is widely used in CNC milling and CNC machining, mainly using the method of manual programming manual programming, and low efficiency, poor accuracy. However, UG contains a 3D modeling and NC milling programming module, in the machining process of the workpiece in NC milling programming, can be performed automatically by UG. Combined with the processor supports a variety of NC machine tool powerful function of UG parametric function and, can quickly generate CNC code automatically, shorten the programmers' time, improve the correctness and safety procedures, reduce the production cost, improve work efficiency.
In this paper, the processing as an example, introduces the method of document processing method for automatic programming of UG and creation of CNC milling machine based on the post, and create a separate post processing to generate the actual constructor operation in accordance with the processing personnel machine program. Milling the surface finish on the NC milling machine, the results show that the machining precision to meet the requirements of the drawings, automatic programming based on UC NC procedures can improve the correctness and security, but also can improve the work efficiency.
This paper focuses on the processing technology of surface parts, through the opening on the drawing of parts for process analysis, and then design a blank, formulate the process route, process dimension and tolerance analysis to determine the selection, processing equipment, and then to the fixture design, tool, measuring tool, eventually make NC program components, applications NC machining in CNC machine tools, finally completed all the procedures of the parts, be qualified parts.
 
Keywords: UG; automatic programming; process analysis; machining; cutting; numerical control programming