Powder metallurgy compressor unloading shaft sleeve and method for preparing same

A powder metallurgy and compressor technology, applied in the field of powder metallurgy compressor unloading bushing and its preparation, achieves the effects of high yield, few steps and simple operation

Inactive Publication Date: 2009-11-11
扬州保来得科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the special requirements for the shape of the product, strict tolerances for the outer diameter, and strict requirements for the metallographic structure of the product, according to such strict technical requirements, the general production method and the traditional powder metallurgy process cannot meet the requirements.

Method used

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  • Powder metallurgy compressor unloading shaft sleeve and method for preparing same
  • Powder metallurgy compressor unloading shaft sleeve and method for preparing same
  • Powder metallurgy compressor unloading shaft sleeve and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After mixing Fe powder, C powder and Mo powder evenly, put them into a molding machine for molding; the parts by weight of each component are: C: 0.30, Mo: 1.0, and the rest is Fe powder; the temperature is controlled at 850°C, and pre-sintered ; followed by shaping; temperature control at 1050°C, and then sintering; heat treatment, after 8 hours, cryogenic treatment; vacuum oil immersion and telecentric separation in sequence, that is, the powder metallurgy compressor unloading sleeve is prepared.

[0030] After testing, the average hardness of the shaft sleeve is HRC≥38, the minimum hardness value is HRC≥35, and the residual austenite structure of the shaft sleeve is 15%, which fully meets the requirements for use. After the durability test, they all meet the life test requirements of the product.

Embodiment 2

[0032] After mixing Cu powder, Fe powder, C powder and Mo powder evenly, put them into a molding machine for molding; the parts by weight of each component are: Cu: 3.0, C: 1.0, Mo: 2.0, and the rest is Fe powder; Control temperature at 940°C, pre-sintering; then shaping; temperature control at 1100°C, then sintering; heat treatment, 6 hours later, cryogenic treatment; vacuum oil immersion and telecentric separation in sequence to prepare powder metallurgy compressor unloading shaft set.

[0033] After testing, the average hardness of the shaft sleeve is HRC ≥ 38, the minimum hardness value is HRC ≥ 35, and the residual austenite structure of the shaft sleeve is 10%, which fully meets the requirements for use. After the durability test, they all meet the life test requirements of the product.

Embodiment 3

[0035] After mixing Cu powder, Fe powder, C powder and Mo powder evenly, put them into a molding machine for molding; the parts by weight of each component are: Cu: 1.0, C: 0.50, Mo: 1.5, and the rest is Fe powder; Control the temperature at 890°C, pre-sintering; then carry out shaping; control the temperature at 1120°C, and then sinter; conduct heat treatment, and after 2 hours, carry out cryogenic treatment; carry out vacuum oil immersion and telecentric separation in sequence, that is, the powder metallurgy compressor unloading shaft is prepared set.

[0036] After testing, the average hardness of the shaft sleeve is HRC ≥ 38, the minimum hardness value is HRC ≥ 35, and the residual austenite structure of the shaft sleeve is 5%, which fully meets the requirements for use. After the durability test, they all meet the life test requirements of the product.

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Abstract

The invention discloses a powder metallurgy compressor unloading shaft sleeve and a method for preparing the same. The shaft sleeve comprises a shaft sleeve body provided with a shaft center hole, the outer side surface of the shaft sleeve body is provided with a tangent plane, and the inner side surface of the shaft sleeve body is an arc protrusion curved surface. The preparation method comprises the following steps: evenly mixing Cu powder, Fe powder, C powder and Mo powder and forming in a forming machine; controlling the temperature to between 850 and 940 DEG C, and performing presintering; performing shaping, controlling the temperature to between 1,050 and 1,200 DEG C, and performing sintering again; orderly performing thermal treatment and deep cooling treatment; and orderly performing vacuum oil immersion and centrifugal separation to prepare the powder metallurgy compressor unloading shaft sleeve. The internal diameter of the shaft sleeve has a shape of the arc protrusion curved surface, the average hardness (HRC) of the shaft sleeve is more than or equal to 38, the minimum hardness (HRC) of the shaft sleeve is more than or equal to 35, and the retained austenite structure of the shaft sleeve is less than 15 percent. The preparation method has the advantages of less steps and simple operation; and products meet life testing requirements through durability tests.

Description

technical field [0001] The invention relates to a powder metallurgy shaft sleeve and a preparation method thereof, in particular to a powder metallurgy compressor unloading shaft sleeve and a preparation method thereof. Background technique [0002] At present, unloading sleeves are widely used in compressors, the purpose is to reduce the friction caused by the high-speed rotation of the bearing. At the same time, it is necessary to ensure that the inner and outer diameters must be wear-resistant and have certain strength requirements. Due to the special requirements for the shape of the product, strict tolerances for the outer diameter, and strict requirements for the metallographic structure of the product, according to such strict technical requirements, general production methods and traditional powder metallurgy methods cannot meet them. Contents of the invention [0003] Purpose of the invention: Aiming at the deficiencies in the prior art, the purpose of the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B39/00B22F3/16B22F5/10
Inventor 刘文雄徐同官劲松刘宇
Owner 扬州保来得科技实业有限公司
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