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Powder metallurgy automobile engine stator and manufacturing methods thereof

An automobile engine, powder metallurgy technology, applied in the manufacture of stator/rotor body, magnetic circuit shape/style/structure, magnetic circuit static parts, etc., can solve the problems of stress concentration, large difference in wall thickness, stator damage, etc. Achieve the effect of increased yield strength, high material utilization, and increased hardness

Inactive Publication Date: 2016-05-25
TAIZHOU KECHENG AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this structure is manufactured, due to the large difference in wall thickness, it is easy to generate stress concentration, which will cause damage to the stator in severe cases.

Method used

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  • Powder metallurgy automobile engine stator and manufacturing methods thereof
  • Powder metallurgy automobile engine stator and manufacturing methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] By weight, nickel powder 1.75, molybdenum powder 0.5, copper powder 1.5, chromium powder 1.7, manganese powder 1.0, graphite powder 0.8, cerium dioxide 0.2, stearic acid Zinc 0.05%, the rest is iron powder, the sum of each component is 100%; the corresponding process is green density 7.5g / cm3, sintering temperature 1200-1240℃, without tempering treatment.

[0032] After testing, the yield strength of the prepared powder metallurgy alloy is 575MPa, the tensile strength reaches 955MPa, the hardness is 98HRB, and the impact toughness is 31.3J / cm 2 .

Embodiment 2

[0034] The chromium and part of iron in the formula of Example 1 are achieved by adding fine particle Cr-Fe alloy powder with an average particle size of 4.65 μm to achieve the weight ratio.

[0035] After testing, the tensile strength of the prepared powder metallurgy alloy reaches 1212MPa, and the hardness is 31HRC.

Embodiment 3

[0037] By weight, nickel powder 1.75, molybdenum powder 0.5, copper powder 1.5, chromium powder 1.7, manganese powder 1.0, graphite powder 0.8, cerium dioxide 0.2, stearic acid Zinc 0.05%, molybdenum disulfide 0.5%, rare earth element La 0.6%, the rest is iron powder, the sum of each component is 100%; the corresponding process is green density 7.5g / cm 3 , Sintering temperature 1200-1240 ℃, without tempering treatment.

[0038] After testing, the yield strength of the prepared powder metallurgy alloy is 578MPa, the tensile strength reaches 962MPa, the hardness is 80-85HRA, and the impact toughness is 58J / cm 2 .

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Abstract

The invention discloses a powder metallurgy automobile engine stator. The stator is a circular ring component taking powder metallurgy as a main body. The stator comprises an annular main body. An inner hole of the main body is formed by several embossments and grooves which are arranged with intervals along a circumference direction. Inner walls of the embossments are provided with technology grooves. A main body outer wall corresponding to a radial direction of the technology grooves is provided with an oil groove. Improved points are characterized in that a hole wall of the inner hole of the main body is provided with a wear-resisting composite layer; and the wear-resisting composite layer is a rare earth compound composite layer. The invention also discloses three kinds of manufacturing methods of the powder metallurgy automobile engine stator. Structure intensity is high, a material utilization rate is high, wear-resisting performance is good and a lubricity is good.

Description

technical field [0001] The invention relates to an engine stator and its manufacturing method, more specifically, the invention relates to an engine stator manufactured by powder metallurgy method and its manufacturing method. Background technique [0002] The powder metallurgy automotive engine stator is a ring-shaped component with powder metallurgy as the main body, including a ring-shaped main body. The inner hole of the main body is composed of several protrusions and grooves arranged at intervals along the circumferential direction. During the manufacture of this structure, due to the large difference in wall thickness, stress concentration is likely to occur, and in severe cases, the stator will be damaged. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a powder metallurgy automobile engine stator that can significantly reduce stress concentration. In addition, the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/12H02K15/02B22F1/00B22F5/00C22C38/44
Inventor 程继贵秦永强钱军徐迅刘桦时辰徐小璟
Owner TAIZHOU KECHENG AUTOMOBILE PARTS
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