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Home - News - How should cnc four-axis machining to tool use problems?

How should cnc four-axis machining to tool use problems?

February 18, 2023

A. Tool position point

cnc four-axis machining tool position point is a reference point on the tool, the tool position point relative movement of the track that is the processing route, also known as the programming track.


Second, the tooling and tooling point

Tool setting is to make the tool position point coincide with the tool setting point by certain measurement means before starting the CNC program by the index control operator. You can use the tool setting instrument to the tool, its operation is relatively simple, the measurement data is also more accurate. You can also position the fixture and install the parts on the CNC machine tool after the use of measuring blocks, stoppers, micrometers, etc., using the coordinates on the CNC machine tool to the tool. On the operator, determine the point of tooling will be very important, will directly affect the accuracy of the machining of parts and program control. In the batch production process, it is more important to consider the repetition accuracy of the tool setting point, it is necessary for the operator to deepen the understanding of CNC equipment and master more tool setting skills.

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(1) the selection guidelines of the tool setting point


In the machine tool is easy to find the right, easy to view in the processing, easy to calculate when programming, and the tooling error is small.
Tool setting point can pick a point on the part (such as the center of the positioning hole of the part), can also pick a point outside the part (such as a point on the fixture or machine tool), but must have a certain coordinate connection with the positioning reference of the part.
Improve the accuracy and precision of tool setting, even if the part does not require high precision or the program requirements are not strict, the machining accuracy of the selected tool setting part should be higher than the machining accuracy of other orientations.

Select the part with large contact surface, easy to monitor, and stable machining process as the tool setting point.

Tooling point as far as possible and the design reference or process reference unified, to avoid the size of the conversion leads to tooling accuracy or even processing accuracy reduced, increasing the difficulty of CNC programs or parts CNC machining.

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In order to improve the machining accuracy of the part, the tooling point should be selected as far as possible in the design of the part benchmark or process benchmark. For example, the hole positioning parts, the center of the hole as the tooling point is more appropriate.
The accuracy of the tooling point depends on both the accuracy of the CNC equipment, but also depends on the requirements of the parts processing, manual check the accuracy of the tooling to improve the quality of CNC machining of parts. Especially in the batch production to take into account the repetition accuracy of the tooling point, the accuracy of the tooling point can be used relative to the machine tool origin of the coordinate value to check.

(2) the selection method of the tooling point

On the CNC lathe or turning and milling machining center CNC equipment, due to the center of the orientation (X0, Y0, A0) has been determined by CNC equipment, determine the axial orientation can determine the entire processing coordinate system. Therefore, only need to determine the axial (Z0 or relative orientation) of a certain end face as a tool setting point can be.