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Manufacture method of high-strength powder metallurgy bevel gear and copper seeping agent for the same

A manufacturing method and powder metallurgy technology, which are used in the manufacture of high-strength powder metallurgy bevel gears and the field of copper infiltration agents, can solve the problems of low density of finished products, residues or pits, poor strength, etc., and achieve good wettability, Improve the density and strength, the effect of high density

Inactive Publication Date: 2008-12-10
南通市海门常乐粉末冶金厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for manufacturing high-strength powder metallurgy bevel gears. On the premise of maintaining product precision, it overcomes the shortcomings of low density and poor strength of finished products of ordinary powder metallurgy methods, and improves the density and strength of products; at the same time, it provides a The slag-free copper infiltrating agent used in this powder metallurgy process solves the defect of residue or pits left on the surface of the product by copper infiltration sintering, and realizes slag-free copper infiltration sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 A high-strength powder metallurgy bevel gear is manufactured according to the method of the present invention.

[0026] Water atomized iron powder is selected, and alloying elements and auxiliary materials are added according to the following proportions: by weight percentage, Cu 1.6%, Ni1.8, Mo0.5, C 0.7%, micro wax powder 0.3, and the rest is water atomized Iron powder. Put the above-mentioned raw materials into a V-shaped mixer for mixing and stirring, and the stirring time is 15 minutes. After mixing, it is pressed into a bevel gear special mold on a powder metallurgy press, and the compact density is 6.8g / cm 3 ~6.9g / cm 3 .

[0027] Put the compact into the sintering furnace, and use Cu-Fe-Ni-Zn slag-free copper infiltrating agent for high-temperature copper infiltrating sintering. The copper infiltrating agent contains (weight percent) carbonyl iron powder 3.5%, Ni 0.9%, Zn 4.5%, The rest is Cu. For sintering, first degrease in the range of 420°C-...

Embodiment 2

[0031] The copper infiltrating agent is an alloy made according to the following weight percentages, wherein carbonyl iron powder is 3%, nickel is 0.7%, zinc is 3%, and the rest is copper.

Embodiment 3

[0033] The copper infiltrating agent is an alloy made according to the following weight percentages, wherein carbonyl iron powder is 5%, nickel is 1%, zinc is 5%, and the rest is copper.

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PUM

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Abstract

the invention discloses a preparing method of high-strength powder metallurgical bevel gear and cupric cemented agent, which comprises the following steps: allocating through ferric powder; stirring evenly; moulding in the specific model on the powder metallurgical machine; sintering to obtain the high-strength bevel gear. the cupric cemented agent is composed of 3-5% carbonyl ferric powder, 0.7-1% Ni, 3-5% Zn and Cu, which doesn't reduce precision of bevel gear.

Description

1. Technical field [0001] The invention relates to a manufacturing process of powder metallurgy parts, in particular to a manufacturing method of a high-strength powder metallurgy bevel gear and a copper infiltrating agent used in the method. 2. Background technology [0002] The bevel gear is one of the key parts in the light mechanical gearbox, which affects the transmission efficiency and service life of the whole machine, and requires high strength and precision. Bevel gears are usually produced by forging / swinging process. The process and equipment are complicated, the material utilization rate is low, and the production cost is high. Due to its technical advantages, powder metallurgy process has been widely used in parts manufacturing. In order to reduce manufacturing costs, domestic manufacturers began to use powder metallurgy to produce bevel gears. In 1991, the "high-precision powder metallurgy gear" project of the Casting Research Institute of Tianjin Machinery R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/16
Inventor 宋永盛高瑞华汤春华宋永刚
Owner 南通市海门常乐粉末冶金厂