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Two-stage press forging and forming method of metal thin shell piece with inward convex micro-structure

A metal thin and convex technology, applied in metal processing equipment and other directions, can solve the problems of slow production speed, low yield rate, casting surface holes and poor mechanical properties, etc., to achieve good forming quality, low forming load, and good mechanical properties. Effect

Inactive Publication Date: 2012-04-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a two-pass stamping and forging forming method for a metal thin shell with an inner convex microstructure, which solves the problems of slow production speed, low yield, poor casting surface holes and poor mechanical properties in the prior art. Applicable materials are magnesium alloy and aluminum alloy

Method used

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  • Two-stage press forging and forming method of metal thin shell piece with inward convex micro-structure
  • Two-stage press forging and forming method of metal thin shell piece with inward convex micro-structure
  • Two-stage press forging and forming method of metal thin shell piece with inward convex micro-structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this embodiment, the grade of magnesium alloy is AZ31B, and the two-pass hot stamping and forging forming method of magnesium alloy thin shell parts, the specific process and steps are as follows:

[0044] (1) Heat the mold to 400°C;

[0045] (2) After polishing the first pass blank 4 (extruded plate or rolled plate) with a thickness of 4.0mm, it is coated with a mixture of graphite and silicone oil. In the present embodiment, the weight percentage of graphite is 15%;

[0046] (3) heating the blank 4 of the first pass to 450°C;

[0047] (4) Put the blank 4 of the first pass into the cavity 3 of the die, and the punch 1 of the first pass moves downward with a reduction of 1.2 mm to form a shell part with a part of the side wall (that is, the second pass blank 5);

[0048] (5) The temperature of the second pass billet 5 is reduced to 400°C;

[0049](6) Use the punch 2 of the second pass, and the punch 2 of the second pass moves downward with a reduction of 1.8 mm to...

Embodiment 2

[0058] The difference from Example 1 is:

[0059] In this embodiment, the grade of magnesium alloy is ZK60A, and the two-pass hot stamping and forging forming method of magnesium alloy thin shell parts, the specific process and steps are as follows:

[0060] (1) Heat the mold to 200°C;

[0061] (2) After polishing the first pass blank (extruded plate or rolled plate) with a thickness of 1.5mm, the mixture of molybdenum disulfide and graphite is coated. In the present embodiment, the weight percentage of molybdenum disulfide is 80% ;

[0062] (3) Heating the blank for the first pass to 250°C;

[0063] (4) Put the blank of the first pass into the die cavity, the punch of the first pass moves downward, and the reduction is 0.4mm, and a shell part with a part of the side wall is formed (that is, the blank of the second pass );

[0064] (5) Lower the temperature of the blank in the second pass to 200°C;

[0065] (6) Use the punch of the second pass, and the punch of the second...

Embodiment 3

[0068] The difference from Example 1 is:

[0069] In this embodiment, the grade of aluminum alloy is 1050, and the two-pass stamping and forging forming method of aluminum alloy thin shell parts, the specific process and steps are as follows:

[0070] (1) be coated with the mixture of talc powder and animal oil after polishing the first pass blank (extruded plate or rolled plate) with a thickness of 3mm; in the present embodiment, the weight percentage of talcum powder is 10%;

[0071] (2) Put the blank of the first pass into the cavity of the die, the punch of the first pass moves downward, and the reduction is 0.8mm, and a shell part with a part of the side wall is formed (that is, the blank of the second pass );

[0072] (3) Use the punch of the second pass, and the punch of the second pass moves downward with a reduction of 1.5 mm to form a complete side wall and a shell with an internal convex microstructure.

[0073] The punched and forged parts are trimmed and then ma...

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Abstract

The invention relates to a metal plastic processing production technology, in particular to a two-stage press forging and pressing method of a metal thin shell piece with the complex geometric shape (with an inward convex micro-structure such as a stud bolt, a buckle and a hinged flange), which is applicable to metal materials such as magnesium alloy and aluminum alloy. A metal plate is taken as a blank, a die needs to be heated to 200 DEG C-400 DEG C for the magnesium alloy (the die does not need to be heated for the aluminum alloy), the magnesium alloy blank is heated to 250 DEG C-450 DEG C(the blank does not need to be heated for the aluminum alloy), a lubricant is uniformly coated on the blank, then the blank is placed in a female die cavity, a first-stage male die is used for forming an outer shell piece with the partial side wall, and a second-stage male die is used for forming the complete side wall and the inward convex micro-structure such as the stud bolt, the buckle, the hinged flange and the like. The method can solve the problems of slow production speed, low excellent rate, holes on the surface of a casting and poor mechanical properties in the prior art, and form the side wall of the metal thin shell piece with high dimensional precision and the inward convex micro-structure with the complex shape, and the forming quality of the inward convex micro-structure isgood.

Description

technical field [0001] The invention relates to metal plastic processing production technology, in particular to a two-pass stamping and forging forming method for thin metal shells with complex geometric shapes (with internal convex microstructures such as studs, buckles and hinged flanges). Background technique [0002] The development of modern electronic technology puts forward higher and higher requirements on the performance of structural materials and components for electronic devices. In order to adapt to the development direction of light, thin and miniaturized electronic devices, the housing materials of electronic devices are required to have the characteristics of low density, high strength and rigidity, good heat dissipation performance, easy recycling and environmental protection requirements. At present, the casings of electronic devices are generally made of plastic. Plastics cannot meet the demand in terms of structural rigidity, heat dissipation, and recyc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02
Inventor 张士宏孙成唐伟东王忠堂
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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