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Powder metallurgy part and preparation method thereof

A technology of powder metallurgy and parts, applied in the field of powder metallurgy parts and its preparation, can solve the problem of poor uniformity of densification on the surface of the preform, affect the surface density and mechanical properties of the final powder metallurgy parts, and the shape and dimensional accuracy of the final parts are not easy to guarantee, etc. question

Active Publication Date: 2020-10-23
XIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, these current manufacturing technologies are likely to cause poor densification uniformity on the surface of the preform, which affects the surface density and mechanical properties of the final powder metallurgy parts, and the shape and dimensional accuracy of the final parts are not easy to guarantee

Method used

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  • Powder metallurgy part and preparation method thereof
  • Powder metallurgy part and preparation method thereof

Examples

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Effect test

Embodiment 1

[0124] This embodiment provides a powder metallurgy wear-resistant ring densified by vibration extrusion on the outer surface, and its preparation process mainly includes:

[0125] ① According to the composition of the powder metallurgy wear ring: Fe-0.5Mo-2Cu-0.6C (wt%), weigh Fe-Mo pre-alloyed powder, copper powder, graphite powder and lubricant in proportion and mix them evenly in the mixer ;

[0126] ② Put the mixed powder in the powder forming mold, and press it into a prefabricated green body of the powder metallurgy wear ring with a porosity of about 10% which is similar in shape and size to the final powder metallurgy wear ring;

[0127] ③The pressed prefabricated body was sintered in a sintering furnace at 1150°C for 60 minutes to obtain a preformed powder metallurgy wear-resistant ring;

[0128] ④ Place the preform of the powder metallurgy wear-resistant ring in the surface vibration extrusion die with a step angle α of 5°, and extrude the wear resistance under the ...

Embodiment 2

[0139] This embodiment provides a vibratory extrusion densified powder metallurgy wear-resistant ring on the surface of the inner hole. The preparation process mainly includes:

[0140] ① According to the powder metallurgy wear ring composition: Fe-2Cu-0.6C (wt%), weigh iron powder, copper powder, graphite powder and a small amount of lubricant in proportion and mix them evenly in the mixer;

[0141] ② Put the mixed powder in the powder forming mold, and press it into a prefabricated green body of the powder metallurgy wear ring with a porosity of about 10% which is similar in shape and size to the final powder metallurgy wear ring;

[0142] ③The pressed prefabricated body is sintered in a sintering furnace at 1200°C for 30 minutes to obtain a preformed powder metallurgy wear ring.

[0143] ④ Place the preform of the powder metallurgy wear-resistant ring in a surface vibration extrusion die with a step angle of 60°, and extrude the wear resistance under the conditions of frequ...

Embodiment 3

[0147] This embodiment provides a tooth surface vibration extrusion densification powder metallurgy gear, the preparation process mainly includes:

[0148] ① According to the powder metallurgy gear composition: Fe-2Cu-0.6C (wt%), weigh iron powder, copper powder, graphite powder and lubricant in proportion and mix them evenly in the mixer;

[0149] ②Place the mixed powder in a powder forming mold, and press it into a prefabricated green body of a powder metallurgy gear with a porosity of about 10% that is similar in shape and size to the final powder metallurgy gear;

[0150] ③The pressed prefabricated body was sintered in a sintering furnace at 1120°C for 45 minutes to obtain a preformed powder metallurgy gear;

[0151] ④ Place the preform of the powder metallurgy gear in a surface vibration extrusion die with a step angle of 30°, and press the gear under the conditions of frequency 50Hz, amplitude 0.5mm, and one vibration cycle extrusion feed rate 0.2mm The surface of the too...

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Abstract

The invention discloses a powder metallurgy part and a preparation method thereof and belongs to the technical field of powder metallurgy. The preparation method of the powder metallurgy part comprises the following step of vibrating and extruding the surface of a prefabricated blank of the powder metallurgy part. The method can provide a uniform extruding force, so that surface metal plastic flowing and surface layer densifying of the prefabricated blank of the powder metallurgy part are more uniform and furthermore, the method can process the powder metallurgy part easily, can ensure the shape and the dimensional precision of the powder metallurgy part better, and further can reduce the extruding load, reduce the wear of an extruding die, prolong the service life of the extruding die andimprove the processing quality and the mechanical property of the powder metallurgy part. The prepared powder metallurgy part is low in extruding load, good in surface quality after being extruded, small in recurrent magnitude, more uniform in densifying of the densifying layer, high in hardness and good in wear resistance.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy part and a preparation method thereof. Background technique [0002] Powder metallurgy technology has the advantages of energy saving, high production efficiency, short production process, less pollution, and near net shape in the manufacture of automobiles, machinery and other parts. However, powder metallurgy parts produced by traditional mixing, pressing and sintering processes often have more coarse pores (low density), which seriously weakens the mechanical properties of powder metallurgy parts such as strength and hardness, and greatly limits the performance of powder metallurgy parts. application range. A large number of engineering practices have shown that the failure of most parts first occurs on the surface of the part, and then leads to the final failure. Improving the surface mechanical properties of parts can significantly improve the...

Claims

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Application Information

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IPC IPC(8): B22F3/20B22F3/24
CPCB22F3/20B22F3/24B22F2003/248B22F2003/242
Inventor 郭彪李肖吴辉李强张羽
Owner XIHUA UNIV
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