1、 1 摘要 数控机床在机械制造业中发挥着巨大的作用,但数控机床一次性投资较大, 对机床进行数控化改造不失为一良策。CA6140 车床主轴转速部分保留原车床的 手动变速功能,改造简单易行,可降低劳动强度,提高生产效率。主要介绍了经济 型数控机床进给伺服系统设计计算。阐述了 CA6140 普通数控车床的主轴系统的 改进及机床的改造。针对现有常规 CA6140 普遍车床的缺点提出数控改装方案和 单片机系统设计，提高加工精度和扩大机床使用范围，并提高生产率。本论文说 明了普通车床的数控化改造的设计过程，较详尽地介绍了 CA6140 机械改造部分 的设计及数控系统部分的设计。 采用以 8031 为 CP
2、U 的控制系统对信号进行处理， 由 I/O 接口输出步进脉冲，经一级齿轮传动减速后，带动滚动丝杠转动，从而实 现纵向、横向的进给运动。 【关键词】CA6140 车床; 数控改造; 滚珠丝杠; 步进电动机; 数控机床；单 片机数控系统；改装设计。 2 Abstract The NC machine plays a very great role in mechanical engineering.Although the investment needs a great deal of money,it is a good way to try digital modification for
3、ordinary lathe.The spindle speed of CA6140 remains the manual function of shiftinggears.The alteration is easy and it can reduce labor intensity and improve productive efficiency.Introduces the design calculation of servo system on economic NC machine tools.It also tells us how to improve the spindl
4、e and the control system of CA6140 NC lathe. To remedy the defects of ordinary lather CA6140, a design of data processing system and its single chip microcomputer system program is put forward to raise the processing precision and extend the machines usage, and to improve production rate。This paper presents the process of designing numerical control reform，and explicitly introduces the design of mechanical and numerical control system reforms。We adopt control system which has 8031 as cpu to cop
