Method for removing stress by using variable-frequency electromagnetic pulses

Abstract

The invention discloses a method for removing stress by using variable-frequency electromagnetic pulses. In the method, a thin-wall sleeve-like workpiece needing machining stress removal is placed in a variable-frequency electromagnetic pulser through the coil of which the pulses having intensity that firstly increases gradually and then decreases gradually and a frequency that changes procedurally from 10kHz to 60kHz pass, so as to be heated quickly to 110 to 160 DEG C by using the heating effect of electromagnetic pulses and is kept at the temperature for 3 to 10 minutes. Currently, the method does not appear in the processing processes for ferro magnetic material thin-wall sleeve-like workpieces and fills a technical blank in the field of ferro magnetic material thin-wall sleeve-like workpiece processing processes. Compared with the prior art and processing method, the method has the advantages that: the processing requires only 3 to 10 minutes, so the processing period is reduced greatly; and energy consumption is only about 10 percent of the conventional processing processes and the pollution is light.

Description

technical field [0001] The invention relates to a processing method for thin-walled sleeve workpieces, in particular to a frequency-variable electromagnetic pulse stress relief method. Background technique [0002] During the machining process, residual stress will be generated inside the workpiece. If the residual stress is not removed in time, it will affect the machining accuracy of the subsequent process (finishing), and will also have a great impact on the precision, quality and service life of the finished workpiece. Especially for thin-walled sleeve workpieces, although the precision is tested to be qualified when the processing is completed, after a period of storage, due to the internal residual stress, the workpiece will be deformed, and in severe cases, the product may even be scrapped. [0003] At present, during the processing of thin-walled sleeve workpieces (such as thin-walled bearings), natural aging or thermal aging processes are generally used for processi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a frequency-variable electromagnetic pulse stress relief method to overcome the shortcomings of the prior art such as long processing period, high cost, large floor space, and large deformation of parts.