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Warm-pressing process of powder metallurgy

A powder metallurgy and warm pressing technology, applied in the field of powder metallurgy warm pressing process, can solve the problems of harsh process conditions and high cost, and achieve the effects of good surface finish, improved pressing density and simple process steps.

Inactive Publication Date: 2013-01-30
曹艺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The technical points of traditional powder metallurgy manufacturing parts are forming technology and material sintering technology. For mechanical structural parts with complex shapes and high precision requirements, the requirements for forming technology are very high, and the process conditions for heat treatment are relatively harsh. One-time pressing and sintering The cost of the ordinary powder metallurgy process is 1, the cost of the powder forging process is 2.0, the cost of the repressing and refiring process is 1.5, and the cost of the copper infiltration process is 1.4, which is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The warm pressing process of powder metallurgy includes the following steps:

[0018] a. Weigh copper gall alloy powder raw materials, amide wax micropowder and graphite, and mix alloy powder, lubricant and additives in a weight ratio of 10:1:1 to form a mixture;

[0019] b. Press the mixed material into the preform, and carry out the warm press forming process on the preform, control the temperature at 130°C, and control the time for 10 hours, and the pressing density of the warm press forming treatment is 7.5g / cm 3 , and then put into the furnace for sintering, the sintering temperature is 1200℃;

[0020] c. Deburring and cutting the above-mentioned sintered preform to form a rough product;

[0021] d. The crude product is subjected to impregnation treatment and surface steam treatment at a temperature as high as 420° C. to obtain finished parts.

Embodiment 2

[0023] The warm pressing process of powder metallurgy includes the following steps:

[0024] a. Weigh the copper gallium alloy powder, zinc stearate and graphite, and mix the alloy powder, lubricant and additives in a weight ratio of 20:1:1 to form a mixture;

[0025] b. Press the mixed material into the preform, and carry out the warm press forming process on the preform, control the temperature at 140°C, and control the time for 11 hours, and the pressing density of the warm press forming process is 7.7g / cm 3 , and then put into the furnace for sintering, the sintering temperature is 1300℃;

[0026] c. Deburring and cutting the above-mentioned sintered preform to form a rough product;

[0027] d. The crude product is subjected to impregnation treatment and surface steam treatment at a temperature as high as 480° C. to obtain finished parts.

Embodiment 3

[0029] The warm pressing process of powder metallurgy includes the following steps:

[0030] a. Weigh the copper gall alloy powder, amide wax micropowder and graphite, and mix the alloy powder, lubricant and additive respectively in a weight ratio of 30:1:1 to form a mixture;

[0031] b. Press the mixed material into the preform, and carry out the warm press forming process on the preform, control the temperature at 150°C, and control the time for 12 hours, and the pressing density of the warm press forming process is 8g / cm 3 , and then put into the furnace for sintering, the sintering temperature is 1400℃;

[0032] c. Deburring and cutting the above-mentioned sintered preform to form a rough product;

[0033] d. The crude product is subjected to impregnation treatment and surface steam treatment at a temperature as high as 550° C. to obtain finished parts.

[0034] The process steps are simple, the pressing density is improved by using the warm pressing forming process, the...

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Abstract

The invention discloses a warm-pressing process of powder metallurgy. The warm-pressing process comprises the following steps of: a, weighing an alloy powder raw material, a lubricating agent and an additive; mixing the alloy powder, the lubricating agent and the additive in a weight ratio of (10-30): 1: 1 to form a mixed material; b, pressing the mixed material into a pre-formed blank; carrying out warm-pressing treatment on the pre-formed blank; controlling the temperature to 130-150 DEG C and controlling the time to 10-12 hours, wherein the pressing density of warm-pressing forming treatment is 7.5-8g / cm<3>; putting into a furnace to be sintered, wherein the sintering temperature is 1200-1400 DEG C; c, de-burring the sintered pre-formed blank; cutting and machining to form a rough product; and d, carrying out immersing treatment on the rough product; and carrying out surface steam treatment at the temperature of 420-550 DEG C to obtain a finished-product part. The process disclosed by the invention has simple steps; the pressing density is improved by adopting a warm-pressing forming treatment process and the cost of the warm-pressing process is only 1.25; the surface smoothness is good and the sintering shrinking percentage is small; and the yielding strength and the impacting toughness are better than those of a traditional process.

Description

technical field [0001] The invention relates to a powder metallurgy warm pressing process. Background technique [0002] The technical points of traditional powder metallurgy manufacturing parts are forming technology and material sintering technology. For mechanical structural parts with complex shapes and high precision requirements, the requirements for forming technology are very high, and the process conditions for heat treatment are relatively harsh. One-time pressing and sintering The cost of the ordinary powder metallurgy process is 1, the cost of the powder forging process is 2.0, the cost of the repressing and refiring process is 1.5, and the cost of the copper infiltration process is 1.4, which is relatively high. Therefore, it is necessary to provide a new technical solution to solve the above problems. Contents of the invention [0003] The purpose of the present invention is to provide a low-cost powder metallurgy warm pressing process. [0004] The technic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F1/00B22F3/24
Inventor 曹艺
Owner 曹艺
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