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Pressure variable edge force difference temperature drawing method for magnesium alloy plate

A technology of variable blank holder force and magnesium alloy, applied in metal processing equipment, forming tools, manufacturing tools, etc., can solve problems such as unfavorable material flow, and achieve good heating and thermal insulation effects, easy to implement, and accurate blank holder force control. Effect

Inactive Publication Date: 2008-04-23
鄂尔多斯市天旭轻合金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are: (1) the temperature of the working parts such as the punch, die, and blank holder is the same, and its essence is an isothermal drawing die; (2) the drawing die adopts an elastic blank holder structure, and the blank holder force varies with the pressure of the punch. The stroke is gradually increased; the patented heating scheme and blank holder force change mode are not conducive to material flow, fully developing the warm and hot forming properties of magnesium alloy sheets

Method used

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  • Pressure variable edge force difference temperature drawing method for magnesium alloy plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Coat the 0.8mm thick AZ31 magnesium alloy slab with high-temperature-resistant lubricating oil and place it in the mold, close the mold, heat the blank holder and the die to 250°C, and pass the high-pressure air of 3Mpa from the high-pressure air compressor into the punch , keep the temperature of the punch at 30°C, hold the holding time for 10 minutes; set the initial blank-holding force to 300kN; ;The drawing speed is 20mm / min, and the limit drawing ratio can reach 3.5.

Embodiment 2

[0026] Coat the 0.8mm thick AZ31 magnesium alloy slab with high-temperature-resistant lubricating oil and place it in the mold, close the mold, heat the blank holder and the die to 225°C, and the high-pressure air of 3Mpa generated by the high-pressure air compressor is passed into the punch , keep the temperature of the punch at 40°C, hold the holding time for 10 minutes; set the initial blank-holding force to 300kN; ;The drawing speed is 20mm / min, and the limit drawing ratio can reach 3.2.

Embodiment 3

[0028] Coat the 0.8mm thick AZ31 magnesium alloy slab with high-temperature-resistant lubricating oil and place it in the mold, close the mold, heat the blank holder and the die to 200°C, and pass the high-pressure air of 3Mpa from the high-pressure air compressor into the punch , keep the temperature of the punch at 50°C, and hold the holding time for 10 minutes; set the initial blank-holding force to 300kN, set the blank-holding force to 600kN between the stroke of 20mm and 40mm, and set the blank-holding force to 400kN between the stroke of 40mm and 60mm ;The drawing speed is 20mm / min, and the limit drawing ratio can reach 3.3.

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Abstract

The variable blank holder pressure and temperature difference drawing method for magnesium alloy plate belongs to the field of material forming technology. The mold of the present invention has male die, hold down plate, female die and female die plate. The drawing process includes the following steps: heating the female die and hold down ring, setting the magnesium alloy plate coated with high temperature lubricating oil inside the die and heating, setting the change values of the hold down force to increase first and decrease then, introducing air to maintain the male temperature at 30-50 deg.C, and drawing at the speed of 20 mm / min and at the hold down force of initial value of 300 kN, 600 kN in stroke of 20-40 mm and 400 kN in stroke of 40- 60 mm. The present invention has good formation performance, 15 % over raised limiting drawing ratio, high formation efficiency and other advantages.

Description

technical field [0001] The invention relates to a method in the technical field of material forming, in particular to a method for drawing a magnesium alloy plate with variable blank-holder force and temperature difference. Background technique [0002] As the lightest metal structure material in engineering applications (mass density of magnesium is about 2 / 3 of aluminum, 1 / 4 of steel), magnesium alloy has high specific strength, good rigidity, good damping coefficient, anti-electromagnetic interference and shielding With the advantages of good performance and high recycling rate, it has great application potential in auto parts, aviation, aerospace, electronics and other industries, and is known as the "green engineering material" with the most potential for development and application. Due to the hexagonal close-packed (hcp) crystal structure of magnesium alloy, the plastic forming ability at room temperature is poor, so at present, magnesium alloy parts are mainly formed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/20B21D37/10B21D37/16
Inventor 范立坤苌群峰李大永曾小勤彭颖红丁文江
Owner 鄂尔多斯市天旭轻合金有限责任公司
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