摘 要
从研究数控龙门铣床着手，借鉴国内外先进经验，设计了一台用于板材及多种工件加工的数控龙门铣床，满足了生产和设计的要求。整个龙门铣床主要包括横纵向进给机构、立柱、横梁、底座、工作台等主要组部件。其中所有进给机构均采用滚珠丝杠进行传动，并由伺服电机进行驱动。主轴箱安装在龙门架上，运用类比法自行设计了滚珠丝杠螺母副的制动装置。
全面阐述了数控龙门铣床的结构原理，设计特点，论述了采用伺服电机和滚珠丝杠螺母副的优点。详细介绍了数控龙门铣床的结构设计及校核，并进行了分析。另外汇总了有关技术参数。
其中着重介绍了滚珠丝杠的原理及选用原则，系统地对滚珠丝杠生产、应用等环节进行了介绍。包括种类选择、参数选择、精度选择、循环方式选择、与主机匹配的原则以及厂家的选择等。
关键词  龙门铣床    数控   伺服电机   滚珠丝杠

Abstract
Begins from the research CNC planer type milling machine, to profit from the domestic and foreign advanced experiences, designed one to use in the sheet material and various workpiece the numerical control CNC planer type milling machine, has satisfied the production and the design request.
Elaborated comprehensively the numerical control CNC planer type milling machine's structure principle, the design feature, elaborated has used step-by-steps the electrical machinery and the ball bearing guide screw nut vice-merit. Introduced in detail the numerical control CNC planer type milling machine's structural design and the examination, and have carried on the analysis. And has compiled the related technical parameter.
In which introduced emphatically the ball bearing guide screw principle and selects the principle，To ball bearing links and so on guide screw production, application has systematically carried on the introduction. Including the type choice, the parameter choice, the precision choice, the round-robin mode choice, the principle as well as the factory choice which matches with the main engine and so on.
Keywords　 planer type milling machine     Board Numerical control     Step-by-steps the electrical machinery      Ball bearing guide screw nut