Powder metallurgy duplicate gear and preparation method thereof

A double gear, powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of uneven green density, poor mechanical properties, uneven overall density of parts, etc., achieve uniform density, improve material utilization and Productivity, the effect of increasing self-lubricating properties

Inactive Publication Date: 2013-07-31
ANHUI HENGJUN POWDER METALLURGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing powder metallurgy parts, due to the different proportions of various raw materials in the formula, it is difficult to ensure uniform mixing during mixing, resulting in uneven density of the pressed green body. After heat treatment, the overall density of the obtained parts is uneven. lead to poor mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Examples Weigh the following raw materials (kg): iron powder 100, copper powder 1.9, molybdenum powder 0.6, vanadium powder 0.2, nickel powder 1.0, graphite powder 0.7, modified tree ash 0.2, rare earth ferrosilicon alloy 0.5, zinc stearate 0.2, Ethylene bis stearic acid amide 0.15, molybdenum disulfide 0.2, aluminum oxide 0.3, boron nitride 0.3, LiF 0.45, the grade of the rare earth ferrosilicon alloy is FeSiRE23, particle size 5-20 mm,

[0021] The preparation method comprises the following steps:

[0022] (1) First put 40-50% of the base iron powder into the high-speed mixer, add silane coupling agent KH-550 with a mass of 0.3-0.6% of the base iron powder, stir at high speed for 5-6 minutes, and then Add copper powder, molybdenum powder, vanadium powder, nickel powder, graphite powder, modified tree ash powder, zinc stearate, ethylene bis stearic acid amide and the rest of the iron powder in turn, and heat while mixing at high speed. When the temperature rises to 12...

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PUM

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Abstract

The invention provides a powder metallurgy duplicate gear which is prepared by pressing the following raw powder materials in parts by weight: 100 parts of ferrous powder, 1.8-2.0 parts of copper powder, 0.5-0.8 parts of molybdenum powder, 0.1-0.3 parts of vanadium powder, 0.8-1.2 parts of nickel powder, 0.5-0.8 parts of graphite powder, 0.1-0.3 parts of modified wood ash, 0.2-0.6 parts of rare earth ferrosilicon alloy, 0.1-0.3 parts of zinc stearate, 0.1-0.2 parts of ethylene bis stearamide, 0.1-0.3 parts of molybdenum disulfide, 0.2-0.4 parts of aluminum oxide, 0.2-0.4 parts of boron nitride and 0.4-0.5 parts of LiF. During preparation, the raw powder materials are mixed step by step, then pressed, sintered, and subjected to heat treatment and surface treatment to form a finished duplicate gear. The produced powder metallurgy duplicate gear has the characteristics that the powder metallurgy duplicate gear is good in abrasive resistance, high in strength, high in hardness, good in machinability, long in service life, corrosion-resistant, and not easy to break.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy double gear and a preparation method thereof. Background technique [0002] Powder metallurgy technology can produce parts requiring high dimensional accuracy and complex shapes in a shape very similar to the shape of the product, which can greatly reduce cutting costs. Therefore, powder metallurgy products are used in various fields as parts of various machines and devices. [0003] Generally speaking, after mixing powders for alloys such as graphite powder and lubricant powders such as stearic acid and zinc stearate into iron-based powders to form iron-based powder mixed powders, the iron-based powder mixed powders are filled into metal Mold, press molding to manufacture iron-based powder compacts (compact powders) for powder metallurgy. Among them, the iron-based powder can be divided into iron powder (pure iron powder, etc.), alloy steel powder, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F5/08
Inventor 丁邦顺
Owner ANHUI HENGJUN POWDER METALLURGY TECH
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