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Isothermal die forging technique of large-sized magnesium alloy component

A technology of isothermal die forging and magnesium alloy, applied in the field of warm die forging, can solve the problems of increasing die damage, difficulty in filling the cavity, and increasing cost, and achieves the effect of improving plastic deformation ability, reducing deformation difficulty and easy deformation.

Active Publication Date: 2013-12-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The die forging temperature range of magnesium alloy is narrow (about 150°C), and the thermal conductivity is very large (167.25W / m·°C). If the die temperature is too low during die forging, the temperature drop of the billet is very serious, especially at the thin wall , the temperature drops rapidly, the plasticity of the metal decreases, the deformation resistance increases, and it is difficult to fill the cavity
(3) After large deformation die forging of magnesium alloy, due to the appearance of a large number of new surfaces, it may cause sticking phenomenon, and prone to folding defects
Although it solves the difficulty of deformation of magnesium alloy and the phenomenon of die sticking and folding that may occur after large deformation die forging, its mechanical properties will be reduced due to the serious growth of grains and uneven structure after repeated heating. Moreover, the pickling and cleaning processes of each pass increase the damage to the mold, while reducing production efficiency and increasing costs
Therefore, it is difficult for the current die forging process to produce a die with a diameter of 680mm and a maximum horizontal projected area of ​​0.4m with high efficiency and low cost. 2 High performance magnesium alloy die forgings

Method used

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  • Isothermal die forging technique of large-sized magnesium alloy component
  • Isothermal die forging technique of large-sized magnesium alloy component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] An isothermal die forging process for large-size magnesium alloy parts, the size is Φ670×100mm, and the composition is (wt.%): Al8.2~8.5; Mn0.2~0.25; Zn0.4~0.5; Cu≦0.05 ; Ni≦0.005; Si≦0.15; Be≦0.02; Fe≦0.05; Area up to 0.4m 2 magnesium alloy parts; including the following steps:

[0045] 1. Machining and flaw detection of billets: Remove visible cracks and scale on the surface of large-size magnesium alloy forging cakes and process them into billets with a size of Φ670×100mm. Ultrasonic waves are used to detect flaws on the billets to ensure that there are no obvious cracks and shrinkage inside the billets. Hole, inclusion defects;

[0046] 2. Billet heating: place the processed billet in a resistance furnace, heat it to 380°C, and keep it warm for 6 hours;

[0047] 3. Fix the lower mold base in the isothermal forming heater, fix the upper and lower molds on the upper and lower mold bases respectively, the matching gap between the mold and the reference plane of the ...

Embodiment 2

[0052] An isothermal die forging process for large-size magnesium alloy parts, the size is Φ670×100mm, and the composition is (wt.%): Al8.2~8.5; Mn0.2~0.25; Zn0.4~0.5; Cu≦0.05 ; Ni≦0.005; Si≦0.15; Be≦0.02; Fe≦0.05; Projected area up to 0.45m 2 magnesium alloy parts; including the following steps:

[0053] 1. Machining and flaw detection of billets: Remove visible cracks and scale on the surface of large-size magnesium alloy forging cakes and process them into billets with a size of Φ670×100mm. Ultrasonic waves are used to detect flaws on the billets to ensure that there are no obvious cracks and shrinkage inside the billets. Hole, inclusion defects;

[0054] 2. Blank heating: place the processed blank in a resistance furnace, heat it to 420°C, and keep it warm for 3 hours;

[0055] 3. Fix the lower mold base in the isothermal forming heater, fix the upper and lower molds on the upper and lower mold bases respectively, the matching gap between the mold and the base surface o...

Embodiment 3

[0060] An isothermal die forging process for large-size magnesium alloy parts, the size is Φ670×100mm, and the composition is (wt.%): Al8.2~8.5; Mn0.2~0.25; Zn0.4~0.5; Cu≦0.05 ; Ni≦0.005; Si≦0.15; Be≦0.02; Fe≦0.05; Horizontal projection area up to 0.5m 2 magnesium alloy parts; including the following steps:

[0061] 1. Machining and flaw detection of billets: Remove visible cracks and scale on the surface of large-size magnesium alloy forging cakes and process them into billets with a size of Φ670×100mm. Ultrasonic waves are used to detect flaws on the billets to ensure that there are no obvious cracks and shrinkage inside the billets. Hole, inclusion defects;

[0062] 2. Blank heating: place the processed blank in a resistance furnace, heat it to 400°C, and keep it warm for 5 hours;

[0063] 3. Fix the lower mold base in the isothermal molding heater, fix the upper and lower molds on the upper and lower mold bases respectively, the matching gap between the mold and the bas...

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Abstract

The invention relates to an isothermal die forging technique of a large-sized magnesium alloy component and belongs to the technical field of magnesium alloy materialmachining. According to the implementation scheme of the invention, the isothermal die forging technique comprises the following steps of heating to 380-430 DEG C after a large-sized magnesium alloy forged disc is machined to be a blank according to a designed blank size; carrying out once isothermal die forging formation at 380-430 DEG C after preserving the temperature for 3-6h to obtain a forged piece; taking out the forged piece and cooling down to obtain a finished-product, wherein the average crystal size of the large-sized magnesium alloy forged disc is smaller than or equal to 15 microns, and the ratio of equiaxed grain number to total crystal grain number of the large-sized magnesium alloy forged disc is equal to or larger than 0.95; in the isothermal die forging process, the downstream speed when the die is fed is 0.05-0.2mm / s, the downstream time when the die is fed is 10-30min, the pressure is 35,000-80,000kN, and the pressure preservation time after the die is formed is 30-40min. According to the isothermal die forging technique of the large-sized magnesium alloy component, which is disclosed by the invention, the magnesium alloy die forged piece with the diameter of 680-1,000mm, the wall thickness of 30-100mm and the maximum horizontal projected area of equal to or larger than 0.4m<2> can be prepared; the preparation technique is simple, the production period is short and the precision and the performance of the obtained forged piece are higher than the precision and the performance of a common die forged piece.

Description

technical field [0001] The invention relates to an isothermal die forging process for large-size magnesium alloy parts, belonging to the technical field of magnesium alloy material processing. Background technique [0002] Due to the essential characteristics of poor plasticity and difficult deformation of magnesium alloys, the current magnesium alloy products are mainly castings, of which more than 90% are die castings. High-performance magnesium alloy forgings are rarely used, and isothermal die forging technology is difficult to deform. The plastic working of this paper points out an effective processing way, and it has good applicability to the isothermal die forging of small size magnesium alloys at present. However, the following difficulties still exist in the isothermal die forging of large-size magnesium alloys: (1) Magnesium alloys are different from other materials such as aluminum alloys, and the number of hot forgings should not be too many. Every time heating a...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21J5/06C22C23/02C22F1/06
Inventor 李慧中姜俊梁霄鹏欧阳杰李轶黄岚刘楚明
Owner CENT SOUTH UNIV
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