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Bottom valve

A bottom valve and main body technology, applied in the field of powder metallurgy, can solve the problems of unsatisfactory quality and waste of raw materials, etc., and achieve the effects of increasing the induced internal stress, reducing the bending strength and improving the surface hardness

Active Publication Date: 2017-02-01
宁波拓发汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the processing of this kind of parts mainly adopts casting and cutting processing, but both casting and machining have the defect of wasting raw materials. In addition, considering the quality of parts, the quality of casting processing can not meet the requirements. Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Mixing: Weigh the raw materials according to the composition and parts by weight of the bottom valve described in Table 1, Example 1, pour the weighed raw materials into a powder mixer and mix to obtain a uniform iron-based powder mixture; the lubricated The agent is a lubricant particle made by mixing polyvinyl isobutyl ether, metal oxide particles, zinc stearate, and fatty acid bisamide in proportion and wrapped by paraffin powder. The mass percentages of each component in the lubricant particle are respectively It is: polyvinyl isobutyl ether 45%, metal oxide particles 11%, zinc stearate 6%, fatty acid bisamide 38%; the metal oxide particles are calcium oxide 5% and aluminum oxide 6% (accounting for mass percent of the total mass of lubricant particles).

[0053] Compression molding: Feed the iron-based powder mixture into the molding machine, under the mixed gas of hydrogen and nitrogen (the volume percentage of hydrogen and nitrogen is 1-3.8%: 96.2-99%), the bottom...

Embodiment 2

[0057] Mixing: Weigh the raw materials according to the composition and parts by weight of the bottom valve described in Table 1, Example 2, pour the weighed raw materials into a powder mixer and mix to obtain a uniform iron-based powder mixture; the lubricated The agent is a lubricant particle made by mixing polyvinyl isobutyl ether, metal oxide particles, zinc stearate, and fatty acid bisamide in proportion and wrapped by paraffin powder. The mass percentages of each component in the lubricant particle are respectively It is: polyvinyl isobutyl ether 48%, metal oxide microparticles 11%, zinc stearate 7%, fatty acid bisamide 34%; described metal oxide microparticles are calcium oxide 5% and aluminum oxide 6% (accounting for mass percent of the total mass of lubricant particles).

[0058] Compression molding: Feed the iron-based powder mixture into the molding machine, under the mixed gas of hydrogen and nitrogen (the volume percentage of hydrogen and nitrogen is 1-3.8%: 96.2-...

Embodiment 3

[0062] Mixing: Weigh the raw materials according to the composition and parts by weight of the bottom valve described in Table 1, Example 3, pour the weighed raw materials into a powder mixer and mix to obtain a uniform iron-based powder mixture; the lubricated The agent is a lubricant particle made by mixing polyvinyl isobutyl ether, metal oxide particle calcium oxide, zinc stearate, and fatty acid bisamide in proportion and wrapping it with paraffin powder. The mass of each component in the lubricant particle is The percentages are respectively: 40% of polyvinyl isobutyl ether, 12% of metal oxide particles of calcium oxide, 8% of zinc stearate, and 40% of fatty acid bisamide.

[0063] Compression molding: Feed the iron-based powder mixture into the molding machine, under the mixed gas of hydrogen and nitrogen (the volume percentage of hydrogen and nitrogen is 1-3.8%: 96.2-99%), the bottom valve blank is obtained by one-time compression molding ; The pressing pressure is 280M...

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Abstract

The invention relates to a bottom valve, and belongs to the technical field of powder metallurgy. The bottom valve comprises a disc-shaped main body, a shaft boss, grooves and protrusions, wherein the grooves and the protrusions are arranged on the edge of the main body evenly, the main body and the shaft boss are arranged coaxially, and the grooves and the protrusions are arranged alternately; and a plurality of through holes are further formed in the main body and located in the inner sides of the grooves and the protrusions. The bottom valve is prepared from, by weight, 1-5 parts of aquadag, 1-5 parts of copper powder, 3-5 parts of nickel powder, 1-3 parts of molybdenum powder, 0.5-2 parts of chromium powder, 0.3-3 parts of lubricating agents, 1-5 parts of calcium fluoride, 0.3-3 parts of manganous sulphide, and 60-100 parts of water-atomized iron powder, wherein the water-atomized iron powder is formed by compounding two kinds of water-atomized iron powder with different particle sizes and specifically includes 20-40 parts of water-atomized iron powder with the particle size being 50-120 [mu]m and 40-60 parts of water-atomized iron powder with the particle size being 10-30 [mu]m. The bottom valve is low in surface porosity, small in dimensional tolerance, high in density, hardness and strength, and long in service life.

Description

technical field [0001] The invention relates to a bottom valve and belongs to the technical field of powder metallurgy. Background technique [0002] As we all know, with the development and progress of the times. Materials, energy and information have been called the three pillars of contemporary science and technology. For materials, especially advanced materials, the level of understanding, ability to master and use will have a vital impact on the scientific and technological and economic strength, comprehensive national strength and social civilization progress of a modern country. The development of materials and the national economic industry development are closely related. Powder metallurgy is the process of using metal materials (or a mixture of metal powder and non-metal powder) as raw materials, forming and sintering to manufacture metal materials, composite materials and various types of products. The powder metallurgy method is similar to the production of ce...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F3/02B22F3/14B22F3/24C22C33/02B22F1/00C22C38/44C22C38/42
CPCC22C33/006C22C33/02C22C33/0264C22C33/0278C22C38/42C22C38/44B22F3/02B22F3/14B22F3/24B22F5/00B22F2998/10B22F2003/241B22F2003/023B22F1/10B22F2003/247
Inventor 石文光
Owner 宁波拓发汽车零部件有限公司
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