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Pressing mold for production of powder metallurgy parts and application of pressing mold

A technology of powder metallurgy and mold pressing, which is applied in the field of powder metallurgy, can solve the problems of reduced service life, reduced product hardness, and poor wear resistance of products, and achieve the effects of prolonging service life, uniform hardness, and improving wear resistance

Active Publication Date: 2019-07-23
LAIWU XINYI SINTERED METAL PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Some powder metallurgy parts need quenching heat treatment after sintering. Quenching heat treatment is to heat the parts at 800-900°C for a period of time, and then rapidly cool them in the medium to improve the hardness and physical properties of the parts, but in the process of cooling the parts , the outside of the product is cooled first, and its cooling rate is faster than that of the inside, which causes the hardness of the product to gradually decrease from the outside to the inside; according to the forming principle of powder metallurgy products, the density distribution of the product gradually decreases from the outside to the inside, The higher the density, the higher the hardness of the product after heat treatment
Therefore, the two factors of product density distribution and cooling rate cause the internal hardness of the parts to be lower than the external ones after overall quenching, and the working parts of some parts are internal, and the internal hardness is low, resulting in poor wear resistance of the product and reducing the service life of the product. It is very necessary to improve the internal hardness of parts

Method used

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  • Pressing mold for production of powder metallurgy parts and application of pressing mold
  • Pressing mold for production of powder metallurgy parts and application of pressing mold
  • Pressing mold for production of powder metallurgy parts and application of pressing mold

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for producing powder metallurgy parts, comprising the steps of:

[0034] (1) The powder metallurgy raw material is pressed into shape by a pressing die; the pressing surface of the pressing die used to press the working surface of the part blank is a hemispherical concave surface, and the concave surface forms a hemispherical convex surface on the pressed blank, so The height of the highest position of the hemispherical convex surface accounts for 3% of the height of the molding body;

[0035] The powder metallurgy raw material is composed of the following components by weight percentage: graphite powder 0.6%, copper powder 3%, lubricant 0.6%, iron powder balance;

[0036] (2) Carry out sintering to the compacted green body, the sintering temperature is 1120 ℃ for 35 minutes, and the sintering process is protected by nitrogen gas;

[0037] (3) The green body after sintering is put into a shaping mold for pressing and shaping; the shaping surface of the shaping...

Embodiment 2

[0041] A method for producing powder metallurgy parts, comprising the steps of:

[0042] (1) The powder metallurgy raw material is pressed into shape by a pressing die; the pressing surface of the pressing die used to press the working surface of the part blank is a hemispherical concave surface, and the concave surface forms a hemispherical convex surface on the pressed blank, so The height of the highest position of the hemispherical convex surface accounts for 4% of the height of the molding body;

[0043] The powder metallurgy raw material is composed of the following components by weight percentage: graphite powder 0.9%, copper powder 1%, lubricant 0.6%, iron powder balance;

[0044] (2) Carry out sintering to the compacted green body, the sintering temperature is 1120 ℃ for 40 minutes, and the sintering process is protected by nitrogen gas;

[0045] (3) the green body after sintering is put into the shaping mold for pressing and shaping; the shaping surface of the shapi...

Embodiment 3

[0049] A method for producing powder metallurgy parts, comprising the steps of:

[0050] (1) The powder metallurgy raw material is pressed into shape by a pressing die; the pressing surface of the pressing die used to press the working surface of the part blank is a hemispherical concave surface, and the concave surface forms a hemispherical convex surface on the pressed blank, so The height of the highest position of the hemispherical convex surface accounts for 3.5% of the height of the molding body;

[0051] The powder metallurgy raw material is composed of the following components by weight percentage: graphite powder 0.8%, copper powder 2%, lubricant 0.6%, iron powder balance;

[0052] (2) Carry out sintering to the compacted green body, the sintering temperature is 1120 ℃ for 40 minutes, and the sintering process is protected by nitrogen gas;

[0053] (3) The green body after sintering is put into a shaping mold for pressing and shaping; the shaping surface of the shaping...

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Abstract

The invention discloses a pressing mold for production of powder metallurgy parts. The pressing mold is used for pressing a to-be-pressed surface of the working surface of a part blank into a semi-spherical concave surface; the concave surface forms semi-spherical convex surface on a pressed-formed blank; and the height of the highest position of the semi-spherical convex surface accounts for 3%-4% of the height of the formed blank. A production method of the powder metallurgy parts includes the following steps that (1) powder metallurgy raw materials are subjected to pressing forming throughthe pressing mold; (2) the pressed and formed blank is sintered; (3) a sintered blank is put in a shaping mold to be subjected to pressing shaping, and the shaping surface of the shaping mold is a plane; and (4) a shaped blank is subjected to heat treatment, and a finished product is obtained. By means of the pressing mold, the uniform hardness of the product after heat treatment is finished is achieved, and the problem that the heat treatment hardness is externally high and internally low is solved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a pressing mold for producing powder metallurgy parts and its application. Background technique [0002] Powder metallurgy is a processing method that uses metal powder as raw material to make various products by pressing and sintering. The production process of powder metallurgy parts has the advantages of rapid prototyping ability of complex parts and high utilization rate of materials, so it is widely used. [0003] Some powder metallurgy parts need quenching heat treatment after sintering. Quenching heat treatment is to heat the parts at 800-900°C for a period of time, and then rapidly cool them in the medium to improve the hardness and physical properties of the parts, but in the process of cooling the parts , the outside of the product is cooled first, and its cooling rate is faster than that of the inside, which causes the hardness of the product to gradually de...

Claims

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Application Information

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IPC IPC(8): B22F3/03B22F3/10B22F3/24B22F1/00C22C38/16C22C33/02
CPCB22F3/03B22F3/1007B22F3/24C22C38/16C22C33/0264B22F2003/248B22F1/10
Inventor 李伟段崇和周文虎苑军
Owner LAIWU XINYI SINTERED METAL PROD CO LTD
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