Forming method and forming device for powder metallurgy part

A technology of powder metallurgy and forming method, which is applied in the field of forming method and forming device of powder metallurgy parts, which can solve the problems of density reduction and achieve the effects of small relative density difference, high relative density and improved green body performance

Active Publication Date: 2020-03-24
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method cannot solve the problem of dimensional accuracy of powder metallurgy parts with large aspect ratio due to the decrease in density caused by the neutral zone and the thinner middle part and thicker ends.

Method used

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  • Forming method and forming device for powder metallurgy part
  • Forming method and forming device for powder metallurgy part
  • Forming method and forming device for powder metallurgy part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0049] The forming method of the powder metallurgy part of the present embodiment is different from Embodiment 1 in that:

[0050] The forming method of this implementation also includes an intermediate pressing between the first pressing of step S1 and the last pressing of step S2. The method of intermediate pressing is the same as the first pressing method: the upper die punch 1 moves upward and leaves the female mold cavity 201 of the female die 2 , the lower die punch 3 descends and remains in the female mold cavity 201, and sends the powder into the female mold cavity 201, and the filling height is lower than the height of the female mold cavity 201. The powder is pressed, the lower die punch 3 remains still, and when the upper die punch 1 descends to the designated position, the pressing is completed. Then do the final pressing.

[0051] The rest of the molding method is basically the same as that of Embodiment 1, and will not be repeated here.

[0052] It should be no...

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PUM

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Abstract

The invention discloses a forming method and a forming device for a powder metallurgy part. The method comprises the steps of: first pressing, final pressing, mold stripping and sintering, the formingdevice comprises an upper plunger, a female die and a lower plunger, the female die is provided with a female die cavity for containing powder, the upper plunger comprises an upper die holder and anupper die stamping piece, the lower plunger comprises a lower die holder and a lower die stamping piece, and the upper die stamping piece and the lower die stamping piece can penetrate into the femaledie cavity to press the powder. A powder part processed by the method and the device has good compactness, the initial density in the middle is increased effectively, the overall density is increased, the relative density difference value is reduced, and the overall green body performance is improved.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a molding method and molding device for powder metallurgy parts. Background technique [0002] Powder metallurgy is the process of using metal powder or a mixture of metal powder and non-metal powder as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. The characteristics of high efficiency, environmental protection, and less waste make its application range and in-depth application expansion in industry continue to expand, and this technology has been continuously improved. Powder metallurgy parts can be seen in the automotive industry, military industry, aerospace, computer industry, nuclear power and other industries. [0003] Large aspect ratio powder metallurgy parts, such as large aspect ratio (L / D>3) rods, have a neutral zone when they are pressed, resulting in a small waist size. The powder metallurgy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/03
CPCB22F3/02B22F3/03
Inventor 刘爱强江凌燕贺蕊刘敏
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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