详细讲述了数控中重要的部件及概念.pptVIP

下载本文档

6
0
约1.54万字
约 67页
2018-05-15 发布于四川
举报
版权申诉

详细讲述了数控中重要的部件及概念.ppt

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Chapter 5:Fundamentals of Numerical Control 5.1 Historical Development/历史演变 It has been over 50 years since … In 1947, a jig borer （坐标镗床）that was coupled with a computer was developed In 1949, a prototype of a programmable milling machine was developed In 1952, a modified three-axis milling machine was demonstrated 5.1 Historical Development/历史演变 Since then, many improvements, in the machine and in the control have been made. NC machine tool/数控机床 Turning center/车削中心 Machining center/加工中心 Mill-turn center/车铣复合加工中心 High-speed machine tool/高速切削机床 Vertical Machining center/立式加工中心 Machining centers and turning centers can perform multiple machining processes Machining center/加工中心 Mill-turn center/车铣复合加工中心 Mill-turn center/车铣复合加工中心 High-speed machine tool/高速切削机床 Three high high-speed spindle: 20,000 rpm high-feed-rate drives: 600 ipm high precision: 0.0001-in accuracy 5.1 Historical Development/历史演变 Position/地位 The invention of the NC machine tool is a major technological evolution in manufacturing. NC is the foundation for many modern manufacturing technologies 5.2 PRINCIPLES OF NUMERICAL CONTROL /数控原理 Definition of NC/定义 “a system in which actions are controlled by direct insertion of numerical data at some point. The system must automatically interpret this data.” ----Electronic Industries Association (EIA) 5.3 CLASSIFICATION OF NUMERICAL CONTROL/数控类型 Motion control: point to point (PTP) continuous (contouring) path Control loops: open loop and closed loop Power drives: hydraulic, electric, pneumatic Positioning systems: incremental positioning absolute positioning Hardware and software: Hardware NC software computer numerical control (CNC) 5.3.5 NC and CNC Hardware NC: vacuum-tube circuit（电子管电路） transistor（晶体管）, relay（继电器） Computer numerical control (CNC) Since the 1980s, no hardwired NCs have been produced. Toda