Electromagnetic forming method for deeply punched member

Abstract

The invention provides an electromagnetic forming method for a deeply punched member. The method comprises the first step of placing a sheet to be formed in a female die, the second step of placing a coil on the sheet to be formed, the third step of allowing the sheet to be formed to be just in contact with a stop block of the female die, the fourth step of driving the coil to descend to the position where the coil is just in contact with the sheet to be formed, the fifth step of performing charging and discharging so as to generate pulse current in the coil to make the sheet to be formed be deformed at a high speed, the sixth step of performing heat treatment of annealing on the sheet to be formed, the seventh step of placing the sheet to be formed after the heat treatment of annealing back onto the female die and pressing the sheet to be formed tight through a drawing ring, and the eighth step of repeating from the second step to the seventh step until electromagnetic forming with a high depth-diameter ratio is completed. Deep drawing of the sheet to be formed (such as an aluminum alloy sheet) is achieved through the electromagnetic forming method of one-time discharging plus one-time annealing, and electromagnetic forming with the high depth-diameter (forming depth to the diameter of a final part) ratio larger than two to one is achieved; compared with common drawing at constant temperature, the extreme drawing ratio can be enhanced obviously.

Description

technical field [0001] The invention belongs to the field of parts forming and manufacturing, and in particular relates to an electromagnetic forming method for deep-drawing components. Background technique [0002] Electromagnetic forming is a high-speed forming method that uses magnetic field force to deform metal blanks. It has the advantages of simple tooling, no lubrication in the process, and high product precision. Especially in the forming of aluminum alloy sheets, it has shown increasingly broad application prospects. [0003] Although the aluminum alloy sheet exhibits superplasticity (hyperplasticity) in electromagnetic forming, the forming limit has been improved to a certain extent; however, due to the short duration of electromagnetic force, the discharge is completed instantaneously, and most of the deformation is completed in the inertial stage. The effect cannot be sustained and the forming depth is limited. Moreover, the forming accuracy is guaranteed by th...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that deep drawing cannot be realized in the existing electromagnetic forming, the present invention provides a method for electromagnetic forming of deep-drawable components. Each discharge passes through the energy-absorbing block to obtain a relatively flat workpiece, and annealing is used after each discharge Heat treatment, and then repeat the above process to gradually realize the forming of parts with large depth-to-diameter ratio

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