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数控加工原理和特点

 (1)数控加工原理
当我们使用机床加工零件时,通常都需要对机床的各种动作进行控制,一是控制动作的先后次序,二是控制机床各运动部件的位移量。采用普通机床加工时,这种开车、停车、走刀、换向、主轴变速和开关切削液等操作都是由人工直接控制的。采用自动机床和仿形机床加工时,上述操作和运动参数则是通过设计好的凸轮、靠模和挡块等装置以模拟量的形式来控制的,它们虽能加工比较复杂的零件,且有一定的灵活性和通用性,但是零件的加工精度受凸轮、靠模制造精度的影响,而且工序准备时间也很长。
采用数控机床加工零件时,只需要将零件图形和工艺参数、加工步骤等以数字信息的形式,编成程序代码输入到机床控制系统中,再由其进行运算处理后转成驱动伺服机构的指令信号,从而控制机床各部件协调动作,自动地加工出零件来。当更换加工对象时,只需要重新编写程序代码,输入给机床,即可由数控装置代替人的大脑和双手的大部分功能,控制加工的全过程,制造出任意复杂的零件。数控加工的原理如图1-1所示。

(2)数控加工的特点
总的来说,数控加工有如下特点:
① 自动化程度高,具有很高的生产效率。
② 对加工对象的适应性强。
③ 加工精度高,质量稳定。
④ 易于建立与计算机间的通信联络,容易实现群控。

转盘轴承加工工艺流程
数控车削加工的主要对象及加工过程

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轴承生产与加工
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