Device and method for pulse current assisted multi-directional forging toughened magnesium alloy
A multi-directional forging, pulse current technology, applied in the field of metal material processing, can solve the problems of poor continuity and manufacturability, long heating time before forging, high energy consumption and high cost, achieve good grain refinement effect, reduce forging passes, The effect of high heating efficiency
Inactive Publication Date: 2017-07-18
HARBIN UNIV OF SCI & TECH
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[0005] The purpose of the present invention is to provide a pulse current assisted multi-directional forging device and method for strengthening and toughening magnesium alloys, so as to solve the problem of many forging passes, repeated heating and long heating time before forging in the multi-directional forging process of magnesium alloys. , low heating efficiency, poor grain refinement effect and other factors cause high energy consumption and cost, poor continuity and manufacturability, and further improve the strengthening and toughening effect and efficiency of magnesium alloys
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[0019] The present invention provides a method for using a pulse current-assisted multi-directional forging device for strengthening and toughening magnesium alloys for magnesium alloys. The specific implementation manners are as follows:
[0020] 1. Set the three mutually perpendicular surfaces of the rectangular parallelepiped forging blank as A surface, B surface, and C surface respectively. Place the forging blank on the titanium plate of the copper spacer 10 along the center line of the mold with the forging blank A facing upwards 4 on, close the mold.
[0021] 2. The forging blank is pre-pressurized, and the pressure is about 5-10 MPa, so as to ensure good contact between the forging blank and the indenter 15 and the titanium plate on the copper spacer 10.
[0022] 3. Turn on the pulse power supply 5 and energize, so that the pulse current density reaches about 25-28A / mm², and keep the power on for about 20-40 seconds, so that the temperature of the forging billet can quickly r...
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The invention relates to a device and method for pulse current assisting multi-directional forging of toughened magnesium alloy. The device specifically comprises a heating device, a heat preservation device, a forging device and an insulation device. The device and method are characterized in that external pulse current of the device is utilized to achieve an assisting effect on the multi-directional forging process, so that the heating, plastification and grain refinement effect of the pulse current acts on magnesium alloy forging stocks during multi-directional forging. Efficient heating and heat preservation of the forging stocks in the multi-directional forging process of the magnesium alloy can be achieved through the device and method, the accelerating effect of the pulse current on recrystallization of the magnesium alloy can be fully used in the deformation process, and grains are further refined, so that toughening of the magnesium alloy is effectively achieved. The problems of high energy consumption and cost caused by negative factors such as multiple passes of forging and pressing, repeated heating, long heating time before forging and poor grain refining effect in common multi-directional forging processes can be solved, the toughening effect of the magnesium alloy is effectively improved, and the efficiency is improved.
Description
Technical field [0001] The invention relates to the field of metal material processing, in particular to a device and method for pulse current assisted multi-directional forging magnesium alloy strengthening and toughening. Background technique [0002] Magnesium alloy was first used in industry as a formal material in the 1930s, when it was used in racing pistons. However, at that time magnesium alloy was still considered a special material with limited potential. Later, with the development and progress of science and technology, the characteristics of magnesium alloy materials were further discovered: ①The density is small, one third lighter than aluminum, and its specific strength (the ratio of tensile strength to density) is higher than that of aluminum alloy; ②Fatigue limit High; ③ can withstand greater impact load than aluminum alloy; ④ good thermal conductivity; ⑤ good castability; good dimensional stability; ⑦ easy to recycle; ⑧ good machinability; ⑨ good vibration redu...
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IPC IPC(8): C22F1/06C21D1/04
CPCC21D1/04C22F1/06
Inventor 李超槐宝李彩霞
Owner HARBIN UNIV OF SCI & TECH