Petrol pump motor oil bearing manufacturing method based on powder metallurgy

A powder metallurgy and manufacturing method technology, applied in the field of bearing manufacturing, can solve the problems of easy segregation of materials, pollute oil pumps, reduce the life of gasoline pumps, etc., achieve the effect of uniform graphite mixing, improve lubrication effect, and reduce mechanical sliding noise

Inactive Publication Date: 2015-12-16
JIANGSU YINGQIU GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

How to solve the conflict between the two is usually adding graphite to the copper powder and dipping high-viscosity lubricating oil. However, due to the large amount of graphite in the bearing manufactured by this method, the material is easily segregated, and the graphite is precipitated in gasoline, and gasoline Dissolve the impregnated oil in the bearing, contaminate the oil pump, and reduce the life of the gasoline pump

Method used

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  • Petrol pump motor oil bearing manufacturing method based on powder metallurgy
  • Petrol pump motor oil bearing manufacturing method based on powder metallurgy
  • Petrol pump motor oil bearing manufacturing method based on powder metallurgy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] S101: Powder mixing: mix the following raw material powders by weight percentage, 70% of Sn element powder, 6% of composite graphite powder, and the rest is copper powder;

[0020] S102: Low-temperature diffusion: the uniformly mixed powder is diffused at low temperature in a diffusion furnace under the protection of nitrogen;

[0021] S103: Compression molding: placing the low-temperature diffused powder in a mold for compression molding, and pressing it into a compact;

[0022] S104: Sintering treatment: gradually sinter and heat the compact in a N and H reducing atmosphere for 0.5 to 1.5 hours, then raise the temperature to 300 to 500°C, then heat to 720 to 820°C for main sintering, keep the temperature constant for 0.5 to 1.5 hours, and then After 0.5 to 1.5 hours, the temperature is gradually lowered to normal temperature, and sintered into an alloy sintered body;

[0023] S105: Finishing and finishing: pressing and shaping the alloy sintered body with a die;

[...

Embodiment 2

[0031] S101: Powder mixing: mix the following raw material powders by weight percentage, 80% of Sn element powder, 8% of composite graphite powder, and the rest is copper powder;

[0032] S102: Low-temperature diffusion: the uniformly mixed powder is diffused at low temperature in a diffusion furnace under the protection of nitrogen;

[0033] S103: Compression molding: placing the low-temperature diffused powder in a mold for compression molding, and pressing it into a compact;

[0034] S104: Sintering treatment: gradually sinter and heat the compact in a N and H reducing atmosphere for 0.5 to 1.5 hours, then raise the temperature to 300 to 500°C, then heat to 720 to 820°C for main sintering, keep the temperature constant for 0.5 to 1.5 hours, and then After 0.5 to 1.5 hours, the temperature is gradually lowered to normal temperature, and sintered into an alloy sintered body;

[0035] S105: Finishing and finishing: pressing and shaping the alloy sintered body with a die;

[...

Embodiment 3

[0043] S101: Powder mixing: mix the following raw material powders by weight, 85% of Sn element powder, 10% of composite graphite powder, and the rest is copper powder;

[0044] S102: Low-temperature diffusion: the uniformly mixed powder is diffused at low temperature in a diffusion furnace under the protection of nitrogen;

[0045] S103: Compression molding: placing the low-temperature diffused powder in a mold for compression molding, and pressing it into a compact;

[0046] S104: Sintering treatment: gradually sinter and heat the compact in a N and H reducing atmosphere for 0.5 to 1.5 hours, then raise the temperature to 300 to 500°C, then heat to 720 to 820°C for main sintering, keep the temperature constant for 0.5 to 1.5 hours, and then After 0.5 to 1.5 hours, the temperature is gradually lowered to normal temperature, and sintered into an alloy sintered body;

[0047] S105: Finishing and finishing: pressing and shaping the alloy sintered body with a die;

[0048] S106...

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Abstract

The invention discloses a petrol pump motor oil bearing manufacturing method based on powder metallurgy. The method comprises the steps of powder mixing, low-temperature diffusion, press molding, sintering, finishing and surface beating, and oil-impregnated treatment. In the powder mixing process, 70%-85% of Sn powder, 5%-10% of composite graphite powder and the balance copper powder are mixed by weight. In the low-temperature diffusion process, evenly mixed powder is subjected to low-temperature diffusion in a diffusion furnace under the protection of nitrogen. In the press molding process, powder subjected to low-temperature diffusion is placed in a die for press molding and pressed into a pressed blank. In the sintering process, the pressed blank is sintered into an alloy sintered body in the N and H reducing atmosphere. In the finishing and surface beating process, the alloy sintered body is pressed and shaped with a molding die. In the oil-impregnated treatment process, the pressed part is placed in a vacuum oil impregnation machine for oil-impregnated treatment. According to the method, the copper-coated graphite powder is added to serve as the solid lubricant to enable Cu-Sn alloy to be combined more easily at a low temperature; furthermore, graphite is evenly mixed and not prone to segregation.

Description

technical field [0001] The invention relates to the field of bearing manufacturing, in particular to a method for manufacturing oil-impregnated bearings of gasoline pump motors by powder metallurgy. Background technique [0002] Various gasoline injection systems are used in modern cars, and their fuel supply areas are also different, but an electric fuel (gasoline) oil pump must be installed. Its main task is to supply the fuel (gasoline) oil system with enough energy. A certain pressure of fuel (gasoline) oil. Because the gasoline pump is installed in the fuel tank, it is immersed in gasoline, and gasoline is an organic solution that can dissolve substances that cannot be dissolved by water such as oil. The powder metallurgy oil-impregnated bearing is due to the pumping action, which sucks out the impregnated oil in the bearing to form boundary lubrication. How to solve the conflict between the two is usually adding graphite to the copper powder and dipping high-viscosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F3/14
CPCB22F5/00
Inventor 王春官丁海维陈璐璐
Owner JIANGSU YINGQIU GRP CO LTD
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