Surface slot blasting sealing method of dewaxed powder metallurgy green ware body

A technology of powder metallurgy and treatment method, which is applied in the field of high-temperature forging of powder metallurgy green bodies, can solve the problems of undamaged oxides and affecting pore structure, etc., and achieve the effects of weakening sensitivity, improving quality, and reducing oxidation and decarburization

Inactive Publication Date: 2014-03-26
刘福平
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Problems solved by technology

Oxidation greatly affects the structure of the pores
While post-forging shot blasting removes oxides from the connecting rod surface, oxides trapped in channels and pores beneath the surface remain unscathed

Method used

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  • Surface slot blasting sealing method of dewaxed powder metallurgy green ware body
  • Surface slot blasting sealing method of dewaxed powder metallurgy green ware body
  • Surface slot blasting sealing method of dewaxed powder metallurgy green ware body

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Embodiment Construction

[0026] Combine below image 3 , the present invention is further described:

[0027] A high-density layer 2 is formed on the surface of the powder metallurgy green body 3 after dewaxing and before sintering, and the thickness of 0.1mm≤high-density layer≤0.5mm. Specifically, the high-density layer 2 is formed on the surface layer of the powder metallurgy green body after dewaxing and before sintering by shot peening and sealing with a shot peening machine.

[0028] The shot peening sealing treatment technology of the shot blasting machine can seal the surface of the powder metallurgy workpiece, that is, close the pores on the surface and near the surface as channels for oxide penetration and decarburization. This technology reduces the oxidation depth by more than 50% and the decarburization thickness by more than 70%. In addition, the hot forged product treated by the shot peening sealing treatment technology of the shot blasting machine eradicates the pores on the surface a...

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Abstract

The invention relates to a surface slot blasting sealing method of a dewaxed powder metallurgy green ware body. The method comprises the steps of dewaxing and sintering, the surface of the powder metallurgy green ware body (3) forms a high-density layer (2) before sintering and after dewaxing, and the thickness of the high-density layer is greater than or equal to 0.1mm and less than or equal to 0.5mm. According to the method, as the surface of the powder metallurgy green ware body (3) forms the high-density layer (2) before sintering and after dewaxing, the high-density layer prevents oxygen and water from entering within preset definite time between a sintering procedure and a hot forging procedure, oxidation and decarburization of powder metallurgy finished products are effectively reduced, and quality of the powder metallurgy finished products is improved.

Description

technical field [0001] The invention relates to a high-temperature forging method for a powder metallurgy green body and a method for shot blasting and sealing the surface of the powder metallurgy green body after dewaxing. Background technique [0002] Over the past two decades, powder forged connecting rods have developed significantly. However, continuous improvement is necessary in order to survive and win in this challenging market. Oxidation and decarburization are recognized as barriers to improving quality and reducing rejects. Everyone knows that oxidation and decarburization mainly occur between the two processes of sintering and forging. When the preformed part of the powder forged connecting rod is taken out of the high temperature sintering furnace, this hot workpiece (approx. caused by water vapor. Before forging, the hot workpiece has interconnected voids, that is, a three-dimensional network of holes connected throughout the entire workpiece, and its poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F3/00
Inventor 刘福平
Owner 刘福平
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