Powder metallurgical gear and forming method thereof

A technology of powder metallurgy and gears, applied in the direction of belts/chains/gears, components with teeth, portable lifting devices, etc., can solve the problems of powder metallurgy gears with insufficient toughness and fragility, and meet the requirements of reducing equipment, The effect of increasing the service life and reducing costs

Inactive Publication Date: 2013-02-20
WUXI ZHONGCAI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing powder metallurgy technology has obvious defects. Most of the powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for forming a powder metallurgy gear, comprising the following steps:

[0026] 1) Prepare the powder metallurgy alloy powder according to the following ratio to obtain the powder metallurgy alloy powder raw material mixture, the ratio is 20kg of sintered aluminum powder, 20kg of nickel-molybdenum alloy powder, 40kg of iron-based alloy powder, 10kg of cobalt-based alloy powder, silicon carbide 1kg, Akewax 2kg;

[0027] 2) Heating the powder metallurgy alloy powder raw material mixture obtained in step 1) to 160° C. under nitrogen protection to obtain heated powder metallurgy alloy powder;

[0028] 3) The heated powder metallurgy alloy powder obtained in step 2) is injected into a gear mold, and the gear mold needs to be preheated to 160° C. and press-molded under a pressure of 300 MPa to obtain a powder metallurgy gear.

Embodiment 2

[0030] A method for forming a powder metallurgy gear, comprising the following steps:

[0031] 1) Prepare the powder metallurgy alloy powder according to the following ratio to obtain the powder metallurgy alloy powder raw material mixture, the ratio is 30kg of sintered aluminum powder, 30kg of nickel-molybdenum alloy powder, 60kg of iron-based alloy powder, 15kg of cobalt-based alloy powder, silicon carbide 3kg, stearic acid 5kg;

[0032] 2) Heating the powder metallurgy alloy powder raw material mixture obtained in step 1) to 200°C under the protection of ammonia gas to obtain heated powder metallurgy alloy powder;

[0033] 3) The heated powder metallurgy alloy powder obtained in step 2) is injected into a gear mold, and the gear mold needs to be preheated to 200° C. and press-molded under a pressure of 450 MPa to obtain a powder metallurgy gear.

Embodiment 3

[0035] A method for forming a powder metallurgy gear, comprising the following steps:

[0036] 1) Prepare the powder metallurgy alloy powder according to the following ratio to obtain the powder metallurgy alloy powder raw material mixture, the ratio is 25kg of sintered aluminum powder, 25kg of nickel-molybdenum alloy powder, 50kg of iron-based alloy powder, 12kg of cobalt-based alloy powder, silicon carbide 2kg, ethyl acetate 4kg;

[0037] 2) Heating the powder metallurgy alloy powder raw material mixture obtained in step 1) to 180°C under the protection of carbon dioxide gas to obtain heated powder metallurgy alloy powder;

[0038] 3) The heated powder metallurgy alloy powder obtained in step 2) is injected into a gear mold, and the gear mold needs to be preheated to 180° C. and press-molded under a pressure of 400 MPa to obtain a powder metallurgy gear.

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Abstract

The invention discloses a powder metallurgical gear which is prepared from powder metallurgical alloy powder, and the powder metallurgical alloy powder is prepared from the following materials in parts by weight: 20-30 parts of sintered aluminum power, 20-30 parts of nickel-molybdenum alloy power, 40-60 parts of iron-based alloy powder, 10-15 parts of cobalt-based alloy powder, 1-3 parts of silicon carbide, and 2-5 parts of lubricant. The invention also provides a method for forming the powder metallurgical gear. The powder metallurgical gear and forming method thereof disclosed by the invention have the beneficial effects that the raw material ratio is changed, the toughness and strength of the powder metallurgical gear can be enhanced, and the service life of the powder metallurgical gear can be prolonged; and in the method for forming the powder metallurgical gear, the pressure is lower than the existing commonly used pressure (500MPa), thereby lowering the demands on equipment and reducing the cost.

Description

technical field [0001] The invention relates to the field of metal components, in particular to a powder metallurgy gear and a forming method thereof. Background technique [0002] Powder metallurgy is a process technology for producing metal or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to manufacture metal materials, composites and various types of products. Powder metallurgy has similarities with the production of ceramics. Therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials. Due to the advantages of powder metallurgy technology, it has become the key to solve the problems of new materials and plays a pivotal role in the development of new materials. Powder metallurgy gears are powder metallurgy parts commonly used in various automobile engines. Through one-time forming and finishing process, no other post-processing process is required, and ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F5/08B22F3/02C22C38/12C22C30/00F16H55/06F16H55/17
Inventor 周元庆
Owner WUXI ZHONGCAI NEW MATERIAL
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