When processing parts, horizontal machining centers usually require the table to rotate at any angle due to the needs of the parts to be processed. When the origin of the workpiece coordinate system coincides with the rotation center of the table, the rotation of the table will not affect the processing. However, the choice of the origin of the workpiece coordinate system is determined according to the structural characteristics of the parts and the needs of programming. Generally, the processed parts cannot coincide with the rotation center of the worktable. The position of the origin of the workpiece coordinate system follows the rotation of the worktable. Changes in the system.
Therefore, reset the origin of the workpiece coordinate system. Each horizontal machining center has a fixed value on the end surface of the z-axis spindle and the rotation center of the B-axis, because when the horizontal and B-axis rotation is used, this value needs to be used when the macro program is used to convert the coordinate system. A simple and feasible solution.
After the origin of the workpiece coordinate system of one surface is set, according to the compensation value, manually calculate the origin of the workpiece coordinate system of the other surface and enter it into the corresponding workpiece coordinate system, which is prone to errors and can only calculate the table rotation of 90 degrees and 180 degrees , The origin of the workpiece coordinate system at 270 degrees, the origin of the coordinate system at any rotation angle cannot be calculated.
This program can realize the automatic compensation calculation of the origin of the workpiece coordinate system at any angle according to the initial workpiece coordinate system origin setting, and set a new workpiece coordinate system origin, which is automatically input into the corresponding workpiece coordinate system, reducing the The setting time and error probability of the workpiece coordinate system improve the production efficiency and accuracy.
Find the distance Z0 of the table rotation center to the Z-direction machine origin is the position of the Z-direction table rotation center. The position of the center of rotation of the table is shown in Figure 1c.
Measurement method: When the worktable is at 0 degrees and 180 degrees respectively, move the worktable to adjust the Z-direction coordinate so that the dial indicator reads the same, then:
Z rotation center = Z coordinate value displayed by CRT
The accuracy of the Z-direction rotation center affects the dimensional accuracy of the distance between the two end surfaces of the machine tool when turning the workpiece (on the premise of accurate measurement of the tool length). Conversely, it can also correct tool length measurement deviation.
Horizontal machining center machine tool rotation center can be used as a reference for a period of time after the accurate value is measured in one measurement. However, with the use of the machine tool, especially when a mechanical failure occurs in the relevant part of the machine tool, the rotation center of the machine tool may change. For example, when a machine tool crashes during processing, when the screw nut of the machine tool becomes loose, etc. Therefore, the turning center of the machine tool must be measured regularly, especially before processing a relatively high-precision workpiece, it should be re-measured to correct the turning center of the machine tool, so as to ensure the accuracy of the workpiece processing.