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Magnesium alloy lean liquid semi-solid impact extruding shaping technology

A forming technology and impact extrusion technology, applied in the field of magnesium alloy semi-solid extrusion deformation processing, can solve the problems of expensive production equipment, high cost of semi-solid forming raw materials, and hindering promotion.

Inactive Publication Date: 2005-02-23
山西银光华盛镁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the high cost of semi-solid forming raw materials and expensive production equipment, its promotion is hindered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Cup-shaped AZ31 magnesium alloy thin shell parts with a diameter of 32 mm, a height of 55 mm, and a wall thickness of 0.3 are produced by the lean liquid semi-solid impact extrusion forming technology. The billet is preheated by induction, and the preheating time is 1 second. Several billets can be preheated at the same time. The whole process does not need to adopt protection measures to prevent oxidation and combustion of magnesium alloys. The forming process parameters are blank preheating temperature 773K, liquid volume ratio of about 3%, deformation pressure of 40Mpa, average punch speed of 400 mm / s, mold temperature maintained at 200-300°C, and piece production cycle of 0.4- 0.5 seconds, the yield rate is above 98%.

Embodiment 2

[0018] The liquid-poor semi-solid impact extrusion molding of the mobile phone case adopts AM60 magnesium alloy sheet material with a thickness of 1mm, the liquid phase content is 5%, the mold temperature is 180-200°C, and the extrusion force is 80MPa. At the beginning of extrusion, the flow resistance is small, and when the mold is filled, the resistance increases, so the pressure should be increased appropriately. Other processing parameters and situation are similar to embodiment 1.

Embodiment 3

[0020] The lean liquid semi-solid impact extrusion forming of magnesium alloy digital camera housing parts adopts AZ91D magnesium alloy sheet, the billet is heated by induction, and the liquid phase content is 7%. The mold design should make the flow of metal flow in a certain direction and order as much as possible to avoid possible defects such as broken ribs. The surface of the mold is smooth and clean, and a good lubricant is used to ensure the minimum friction coefficient during the extrusion process, so that the metal flow is more uniform. The mold temperature is 200-300°C, and the extrusion force is 100MPa. The filling speed is 300-400mm / s to prevent excessive cooling, resulting in a sharp increase in resistance, so impact extrusion is used. Other processing parameters and situation are similar to embodiment 2.

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Abstract

A liquid-poor semi-solid punch-squeeze technology for forming Mg-alloy workpiece includes such steps as heating the raw Mg-alloy material until less liquid is generated and punching squeeze.

Description

technical field [0001] The invention belongs to a metal semi-solid plastic deformation processing technology, in particular to a magnesium alloy semi-solid extrusion deformation processing technology. technical background [0002] Magnesium is the lightest metal structure material. Its specific strength and specific stiffness are second only to titanium alloys and alloy structural steels. Others such as impact resistance and recyclability are superior to aluminum alloys. Magnesium is rich in resources, easy to produce, and low in energy consumption for smelting and casting. Magnesium has become the third largest metal structural material next to steel and aluminum alloys. It is used more and more in the field of lightweight manufacturing of structures, appliances and equipment. wide. [0003] Information, communication, and imaging equipment require aesthetics, portability, electromagnetic shielding, impact resistance, high rigidity, strong heat dissipation, and environment...

Claims

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Application Information

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IPC IPC(8): B21J1/06B22D18/02
Inventor 李华伦黄育宏李书伟杨仲可
Owner 山西银光华盛镁业股份有限公司
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