Electroplastic Incremental Forming Method of Magnesium Alloy Sheet

Abstract

The invention discloses an electroplastic progressive forming method for a magnesium alloy sheet, which belongs to the field of metal processing. The magnesium alloy sheet is progressively formed by a machine tool. The upper and lower surfaces of the magnesium alloy sheet are connected with a pulse power supply, and the output voltage of the pulse power supply is It is a narrow-tip shock triangular wave pulse, the narrow-tip shock triangular wave pulse width is 60-80μs, the output voltage of the pulse power supply is greater than or equal to 70V, the output frequency of the pulse power supply is greater than or equal to 200Hz, and the effective value of the current density flowing through the magnesium alloy sheet is greater than or equal to 95A / mm2. When the effective value of the current density is greater than or equal to 95A / mm2, the magnesium alloy sheet material has good formability, high shape limit, good forming accuracy and good forming quality; the present invention reduces the recrystallization temperature of the magnesium alloy sheet material; Pulse power supplies generate less Joule heat. Compared with the prior art, the invention has high forming limit, good forming precision and good forming quality of the magnesium alloy sheet material, and can obtain better quality parts at lower temperature.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to an electroplastic progressive forming method for a magnesium alloy sheet. Background technique [0002] The electroplastic effect is a phenomenon in which the deformation resistance of materials decreases and plasticity increases under the action of electricity (including electrical stimulation such as electron irradiation, electric field, and current pulse). Using the electroplastic effect can not only reduce the flow stress, improve the plasticity of the material, but also improve the structure and properties of the product to a certain extent, and at the same time avoid many shortcomings of heating and heat treatment, and reduce equipment costs. The electroplastic effect is the result of various physical effects such as Joule heating effect, magnetic compression effect, skin effect and pure electroplastic effect. The high-density moving electrons flowing through the metal defo...

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Problems solved by technology

However, this method only made some improvements on the conventional machine tool use method, and did not study the various parameters (such as current, etc.) in the sheet metal forming. Since the electroplastic effect is closely related to the current, when the current is not appropriate, the sheet metal Poor formability, resulting in low sheet forming limit, poor forming accuracy and poor forming quality

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