JW-CIMS 中 CAD/CAM 的集成

CAD/CAM integration based on STEP standard

介绍了基于ＳＴＥＰ的工程设计集成系统ＪＷ－ＣＡＤ／ＣＡＭ。该系统在统一的产品信息模型基础上，采用ＳＴＥＰ实现产品数据的交换与共享，达到ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成。ＣＡＤ系统根据应用协议（ＡＰ）建立零件特征模型，输出ＳＴＥＰ中性文件；ＣＡＰＰ根据协议对ＳＴＥＰ中性文件进行后处理，提取零件信息，制订加工工艺；铸造ＣＡＤ／夹具ＣＡＤ完成零件铸件毛坯的设计和装夹设计；ＣＡＭ后处理产生的ＮＣ代码在传给加工机床使用之前，加工仿真根据ＮＣ代码模拟毛坯加工过程，检查ＮＣ代码正确性以及加工时刀具、夹具、机床之间碰撞干涉状况。

STEP standard affords a method for data representation and exchange in the whole production life. This paper presented an integration CAD/CAM system JWCAD/CAM based on STEP standard. The system realizes the production data exchange and shares with STEP by adopting a unified production information model. CAD system created part feature model according to application protocol (AP), output to STEP file; CAPP postprocess the STEP file according to AP, pick up part information and establish process plans; cast CAD/Fixture CAD accomplishes the design of block and fixtures; CAD generates NC code and translates it to machining process simulator; machining process simulator checks the validity of the NC program to confirm the probable collision between cutter, fixtures and, machine tools.