When using a vertical cnc machine to process parts, one of the most important operations is to perform tool setting. The accuracy of tool setting will directly affect the accuracy of parts processing. Therefore, it can be said that the accuracy of the tool setting process will affect the machining accuracy of parts. As a professional machining center manufacturer, our technical experts will introduce to you in detail several issues involved in the machining center tool setting process for your reference:
1. First, let's talk about the steps of knife setting:
Steps of tool setting in CNC machining center-workpiece positioning and clamping (that is, the preparation work before tool setting is often said). Commonly used clamps on CNC milling machines include flat-nose pliers, indexing heads, three-jaw self-centering chucks and Platform fixtures, etc.,
The economical CNC milling machine generally uses flat-nose pliers to clamp the workpiece. Install the flat-nose pliers on the center of the worktable of the milling machine and then align and fix the flat-nose pliers according to the height of the workpiece. Put a shim with a suitable shape and good surface quality into the jaws of the flat-nose pliers, and then put the workpiece, usually with the reference surface of the workpiece facing down, close to the surface of the shim, and then tighten the flat-nose pliers.
2. Tool setting steps of machining center-determination of tool setting point and tool change point
(1) Determination of the tool setting point. The tool setting point is the reference point used to determine the position of the workpiece coordinate system in the machine tool coordinate system after the workpiece is positioned and clamped on the machine tool.
The tool setting point can be selected on the workpiece or the clamping and positioning component, but the tool setting point and the workpiece coordinate point must have an accurate and reasonable positional correspondence to facilitate the calculation of the position of the origin of the workpiece coordinate system on the machine tool.
Generally speaking, the tool setting point is best to coincide with the origin of the workpiece coordinate system.
(2) Determination of tool change point
On a milling machine or machining center machine tool that uses a variety of tools for processing, the tool needs to be changed frequently during workpiece processing. The tool change point should be based on the principle that the tool does not touch the workpiece, fixture and machine tool during tool change.
3. Tool setting steps of machining center-common tool setting methods of CNC milling machine tool setting operations are divided into X, Y direction tool setting and Z direction tool setting. The accuracy of tool setting will directly affect the machining accuracy. The tool setting method must be compatible with the machining accuracy requirements of the parts.
According to the different tool setting tools used, the commonly used methods of tool setting are as follows:
(1) Trial cutting method;
(2) Feeler gauge, standard mandrel and block gauge tool setting method;
(3) Tool setting methods such as edge finder, eccentric rod and Z-axis setter are used;
(4) Top knife setting method;
(5) Dial indicator (or dial indicator) method of knife setting;
(6) Tool setting method with special tool setting device.
In addition, depending on the position of the selected tool setting point and the data calculation method,
It can be divided into unilateral tool setting, bilateral tool setting, transfer (indirect) tool setting method and "centering to zero" tool setting method (requires the machine tool to have relative coordinate and zero reset function).
