Thermal hydro-mechanical drawing forming method for dot matrix self-impedance electrical heating plates

Abstract

The invention relates to a thermal hydro-mechanical drawing forming method for dot matrix self-impedance electrical heating plates, and belongs to the technical field of the thermal hydraulic forming of the plates. The method comprises the following steps of: fully filling liquid into a cavity of a female die serving as a liquid pond; when the plates are driven by a male die to enter the female die, forming the plates by reverse pressure generated when the liquid is compressed; embedding pin type electrodes inside pressure plates according to the distribution of dot matrixes, and performing self-impedance electrical heating on flanges of the plates by using contact resistors between the electrodes and the plates; adjusting the distribution of temperature fields of the flanges by changing the distribution law of the dot matrixes of the electrodes and adjusting the heating current of each heating electrode; adjusting the flow stress of heating points by changing the temperature of each mass point on the flanges so as to control the flow of metal by the asynchronous flow of the metal mass points on the flanges; and coordinating the deformation process of the metal by the asynchronousdeformation of each mass point on the flanges due to the temperature to fulfill the aim of improving the limit drawing ratio of the plates. The method has the advantages that: the heating speed is high, the effect is good, the plates can be heated controllably and flexibly, and the forming limit of the plates is improved.

Description

Technical field: [0001] The invention discloses a lattice self-resistance electric heating plate warming liquid-filled deep drawing method, which belongs to the technical field of plate warm forming. Background technique: [0002] Sheet metal hydraulic warm forming is one of the development trends of sheet metal hydraulics. By heating the blank of the flange, the drawing resistance can be reduced and the limit drawing ratio of the sheet can be increased. Usually, heating resistors are buried inside the binder plate and the die to realize the heating of the flange, such as figure 2 shown. The flange is heated by the heating method of buried resistance, which has low heating flexibility and poor controllability, and the formed temperature field is relatively uniform, which is not conducive to the differential control of metal flow. In sheet metal forming, the metal flow of each particle in the deformation zone is coordinated and controlled, and the performance of sheet meta...

AI Technical Summary

Problems solved by technology

The flange is heated by the heating method of buried resistance, which has low heating flexibility and poor controllability, and the formed temperature field is relatively uniform, which is not conducive to the differential control of metal flow

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