Method for compensating electrode loss based on discharge energy in electricity discharge milling process

Abstract

The invention discloses a method for compensating electrode loss based on on-line discharge energy detection in an electricity discharge milling process, which is characterized in that the electrode loss is compensated based on the discharge energy amount between the on-line real-time detected electrode and a workpiece in the electric discharge milling process; the relation data of the electrode loss amount and the discharge energy is determined through a statistical manner according to the experimental measurement between the discharge energy and the electrode loss at the process condition that the process parameters in the process are the same; or the loss amount of the electrode relative to the discharge energy in the current phase is determined according to the discharge energy and the electrode actual loss at the previous phase of the electricity discharge milling process; the electrode actual loss is detected through the contact between the electrode and the datum plane which is arranged relative to the workpiece; and the amount of the discharge energy is sampled at regular time through the discharge power or current signals, and accumulated to obtain the discharge energy value. The method of the invention can preferably adapt to the changes of the workpiece shape and the processing state, and correspondingly dynamically adjusts the electrode compensation value, so as to lead the electrode loss compensation value to be more accurate in the electricity discharge milling process, thus improving the workpiece processing accuracy.

Description

technical field [0001] The invention relates to a method for online compensation of electrode loss in electric discharge milling, which belongs to the field of special processing. Background technique [0002] In aerospace, military industry, gas turbine, mold and other fields, there are many parts of special materials that need to be processed, such as titanium alloy, high temperature heat-resistant alloy, stainless steel, etc. These materials have strong viscosity, poor thermal conductivity, and poor machinability. The processing efficiency is very low, especially the cost of cutting tools is very high, which seriously restricts the technological progress and development of these industries. In recent years, with the rapid development of electrical machining technology and technological level, the milling forming technology for the above special materials has been proposed as a cutting-edge electrical machining technology. Among them, discharge layered milling as a new pro...

AI Technical Summary

Problems solved by technology

However, the actual situation is that, on the one hand, due to the complexity of the shape of the processed part, the shape of the part in the current processing path or period is often inconsistent with the shape of the part in the process test or the previous path or period, resulting in a significant drop in the accuracy of the processed workpiece

On the other hand, due to the existence of "empty tool" (no machining allowance) and the different processing conditions, the electrode loss will be significantly different, resulting in inaccurate compensation for online electrode loss, and the effect of compensation and processing size control will be affected.

Images