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Types of Control Systems
控制系统的类型
There are two basic types of control system in numerical control:point-to-point and contouring. In the point-to-point system, also called positioning, each axis of the machine is driven separately by leadscrews and, depending on the type of operation, at different velocities.
数控有2种基本类型,点对点式和轮廓式控制,点对点式控制也称定位控制,每个轴都是通过丝杠单独驱动,根据加工类型不同,加工速度也不一样。
The machine moves initially at maximum velocity in order to reduce nonproductive time but decelerates as the tool reaches its numerically defined position.
机器开始以最大速度运行来减少非加工时间,但当他达到数据定义的位置时,机器开始减速。
Thus in an operation such as drilling or punching, the positioning and cutting take place sequentially.
因此在一个操作中,如钻或冲孔操作先定位在加工。
After the hole is drilled or punched, the tool retracts, moves rapidly to another position, and repeats the operation.
在钻或冲孔之后,迅速收起工具移动到另一个位置重复此操作。
The path followed from one position to another is important in only one aspect: The time required should be minimized for efficiency.
从一个位置移到另一个位置是非常重要的,要遵循一个原则,从效率上考虑只要时间最短即可。
Point-to-point systems are used mainly in drilling, punching, and straight milling operations.
点对点系统主要用于钻,冲孔,直铣操作中。
In the contouring system, also known as the continuous path system, positioning and cutting operations are both along controlled paths but at different velocities. Because the tool cuts as it travels along a prescribed path, accurate control and synchronization of velocities and movements are important.
轮廓式也就是连续路径式系统,定位和切削同时按不同速度来控制,由于刀具在指定路线运动同时切削,因此速度和运动的同步控制是非常重要的。
