cad/cam集成的双刀车削数控编程系统的开发.doc

CAD/CAM集成的双刀车削数控编程系统的开发

摘要

随着火车提速，对车轮的质量和加工精度提出更高的要求。车轮毛坯是热轧件，毛坯尺寸散差大。车轮按订单生产，中小批量，供货周期短，要求数控编程周期短、效率高、错误率低。手工编程不能满足生产要求，应用现代编程技术是理所当然。目前国内外关于数控车床自动编程技术研究得较多，而双刀架数控车床自动编程技术研究的较少。根据企业的需求开发双刀数控车削自动编程系统，该系统在计算机辅助下进行产品建模、工艺规划、刀位数据计算、NC程序生成和轨迹模拟等任务，从而提高数控编程效率和质量。本文主要研究内容如下：

1．综述国内外数控技术现状及发展趋势。论述了数控编程技术和方法，指出了双刀车削数控编程系统的一些关键技术。

2．介绍了双刀车削数控自动编程系统的开发平台及开发工具：0bjectARX、VC．NET。

3。设计了双刀车削数控自动编程系统的功能及技术方案，包括菜单的定制、工艺交互、前置处理、后置处理和刀具运动轨迹模拟。

4．在CAD通用平台上实现人机交互工艺规划，以工步为单元输入工艺数据，并用链表存储这些信息。

5．论述刀具运动轨迹模拟的目的和实现轨迹模拟时涉及的关键技术，以及轨迹模拟在AutoCAD平台上的效果。

关键词：双刀车削加工；数控编程；轨迹模拟；VC．NET；ObjectARX

Development on CAD／CAM Integrated Twin—cutter

NC Turning Programming System

Abstract

With increase speed of train, the higher quality and machining accuracy of train wheels are required. The rough wheels are hot rolled steel, whose dimensions are scattered in a large range. The wheels are produced by order with middle or small batch. The cycle of supply is short．Given the situation mentioned above, NC programming is requested to be fast，efficient，and accurate．Manual programming can not satisfy the demands of production．With no doubt, modem programming technology is the first choice. In recent years, automatic programming technology of single-curer NC lathes has been researched widely in the world. However, the technology of twin-cutter NC lathes has barely been researched．Twin-cutter NC turning programming system is helpful to improve programming efficiency and quality according to enterprise’s requirements．In this system，computer-aided technology is utilized in creation of the models，process planning，calculation of curer location data(CLDATA), generation of NC code and simulation of the machining, etc. The main contents are as follows：

1．An overview on current situation of NC technology is represented．NC programming technology and method are presented．Further more，some key technologies of twin-cutter NC    turning programming system are released。

2．The platforms and tools(ObjectARX and VC．NET)to develop twin-cutter NC turning programming system are introduced．

3．The function and technology scheme of twin-cutter NC turning programming system are designed, with the content of menu customization，interactive interfaces of process，preprocess，post process and simulation of the tool path．

4. The function of the interactive process plan is performed on common CAD platform．Process plan data is gathered as unit of step，which is stored into chain tables.

5．The purpose of simulating tool paths and the key technology of implementing trail simulation are discussed. Besides, the effect of trail simulation on AutoCAD platform is presented too．

Key Words：twin—curer turning；NC programming；trail simulation；VC．NET；ObjectARX

目录

第一章绪论…………………………………………………………………… 4

1.1国内外数控技术的现状………………………………………………………………… 4

1.2数控技术的发展趋势…………………………………………………………………… 5

第二章双刀车削数控自动编程关键技术分析……………………………… 6

2.1 CAD建模………………………………………………………………………………… 6

2.2 工艺规划………………………………………………………………………………… 6

2.3 刀具轨迹的自动生成…………………………………………………………………… 6

2.4 前置处理和后置处理…………………………………………………………………… 6

2.5 刀具运动轨迹模拟……………………………………………………………………… 7

2.6 加工过程分析…………………………………………………………………………… 8

第三章 双刀车削数控系统的开发平台…………………………… 9

3.1 AUTOCAD简介…………………………………………………………………………… 9

3.2开发工具0bjectARX………………………………………………………………………9

第四章 双刀车削数控编程系统功能要求……………………… 11

4.1 AutoCAD菜单的定制…………………………………………………………………  11

4.2 工艺交换……………………………………………………………………………… 11

4.3 前处理与后处理……………………………………………………………………… 12

4.4 模拟轨迹……………………………………………………………………………… 13

第五章 双刀车削工艺规划及信息处理………………………… 14

5.1双刀车削的特点…………………………………………………………………………14

5.2 工艺规划……………………………………………………………………………… 14

5.2.1 工艺规划方法……………………………………………………………………… 14

5.2.2 左右刀架加工任务的分配原则…………………………………………………… 14

5.2.3 切削参数的确定…………………………………………………………………… 15

5.3 工艺规划中防止刀具干涉问题……………………………………………………… 15

5.4 加工规划数据储存…………………………………………………………………… 16

第六章 轨迹模拟………………………………………………… 17

6.1 轨迹模拟的目的……………………………………………………………………… 17

6.2 影响模拟效果的因素………………………………………………………………… 17 

6.3 轨迹模拟在AUTOCAD平台的实现…………………………………………………… 18

结论…………………………………………………………………19

致谢…………………………………………………………………20

参考文献……………………………………………………………21