Method for machining circular array grooves with electrode displacement compensation

Abstract

The invention discloses a method for machining circular array grooves with electrode displacement compensation. The method comprises the following steps that step 1, a cantilever-type electrode base is manufactured and is designed according to the size of a larges workpiece which can be placed in a machine tool and the axial stroke differences of the machine tool; step 2, the displacement of an electrode relative to the rotation axis of a C axis is corrected by utilizing an EROWA probe and a criterion ball; the C axis is of an internal C-axis structure which rotates around the Z-axis of a four-axis electric discharge forming machine; step 3, the center of a part is corrected by adopting a dial indicator or a four-point aligning method, so that the rotation center of the C axis coincides with the rotation center of the uniform grooves; and step 4, a machining program is called out, and part feature dimensions and electrode displacement are input at corresponding variable parts of the program. By adopting the method, the machine tool can find correct machining hole positions when the cantilever-type electrode base is applied due to electrode displacement compensation precise measurement and calculation.

Description

technical field [0001] The invention belongs to the field of electric discharge machining, in particular to a method for machining circular array grooves with electrode offset compensation. Background technique [0002] The fourth axis of the domestic four-axis EDM machine is a built-in C-axis structure that rotates around the Z-axis. The electrode is clamped on the rotatable C-axis through a pneumatic quick-change system, and the worktable is fixed at the bottom of the machine tool. When machining the centripetal annular uniform groove, the hole position is often out of tolerance due to the offset between the electrode center and the C-axis rotation center in the X and Y directions. However, when machining evenly distributed grooves with a large centripetal radius, the electrode cannot reach the machining position due to the travel limitation of the machine tool. For programming, according to different requirements, the coordinates of the center point of each groove are co...

AI Technical Summary

Problems solved by technology

If the radius of the part or the uniform number of centripetal grooves is different, it is necessary to re-convert the coordinate points and reprogram, which is time-consuming and labor-intensive

Otherwise, special tooling that can be manually rotated and positioned needs to be dispatched. After each groove is processed, the processing needs to be suspended, and the tooling must be manually rotated and positioned to the next groove before continuing to process. The efficiency is low, the work intensity is high, and the tooling production cost is high.

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