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Powder metallurgy cam and preparation method thereof

A powder metallurgy and cam technology, applied in the field of powder metallurgy cam and its preparation, can solve the problems of poor cam dimensional accuracy, increase in production cost, increase equipment investment, etc., and achieve reduction in production cost, equipment investment, and energy consumption. Effect

Inactive Publication Date: 2017-11-28
GRIPM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process increases the investment in equipment, and also increases the energy consumption, thereby increasing the production cost, and the dimensional accuracy of the cam after pre-burning becomes worse

Method used

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  • Powder metallurgy cam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of powder metallurgy cam and the preparation steps of the camshaft prepared from this cam are as follows:

[0022] (1) Put 97.0% ASTALOY-E alloy powder, 2.0% graphite and 1.0% epoxy resin powder into the mixer, and take it out after mixing for 2 hours;

[0023] (2) Put the uniformly mixed powder in step (1) into a mold for molding, the molding pressure is 450MPa, take it out after pressing, and obtain the cam green body;

[0024] (3) The green body obtained in step (2) is placed in a blast drying oven for curing, and the curing temperature is 120° C.,

[0025] (4) The solidification time is 120min, cool down with the furnace, and take out;

[0026] (5) Assembling the solidified green body obtained in step (3) into a shaft on a camshaft assembly machine, the assembly interference is 0.04 mm;

[0027] (6) Put the camshaft obtained in step (4) into a vacuum sintering furnace for high-temperature calcination at a temperature of 1098°C for 2 hours. After cooling, ta...

Embodiment 2

[0029] A powder metallurgy cam and a camshaft prepared from the cam, the preparation steps are as follows:

[0030] (1) 1.5% epoxy resin and 0.5% polyurethane are dissolved in ethyl acetate to obtain binder solution;

[0031] (2) Put 84.0% (mass fraction, the same below) atomized iron powder, 3.0% copper powder, 3.0% graphite, 6.0% ferrochromium, and 2.0% ferrophosphorus into the mixer, pre-mix for 0.5 hours, and spray Add the binder solution in the same way, dry while mixing, and finally get a uniformly dry bonding powder;

[0032] (3) Put the uniformly mixed powder in step (2) into a mold for compression molding, the molding pressure is 600MPa, take it out after compression, and obtain the cam green body;

[0033] (4) Place the green body obtained in step (3) into a blast drying oven to solidify, the solidification temperature is 120° C., and the solidification time is 150 min. Cool with the furnace and take it out;

[0034] (5) Assembling the solidified green body obtaine...

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Abstract

The invention discloses a powder metallurgy cam and a preparation method thereof and relates to the technical field of powder metallurgy. A binding agent is added to raw material powder of the cam; and after compression and low-temperature curing of the cam are completed, a cam green body with the strength being 15 MPa or above and the tensile deformation rate being 0.05% or above can obtained. It can be guaranteed that in the transportation and assembling processes, edges of the cam green body do not fall, and the cam green body does not crack; therefore, direct interference assembly of the cam green body is achieved; and in addition, after the cam is sintered, performance is equivalent to that of a cam prepared through a traditional process. The process can replace the traditional process that the cam is presintered and then assembled; equipment investment is reduced; energy consumption is lowered, and thus production cost is lowered; and in addition, the problem that dimensional precision of the presintered cam is worsened is solved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a powder metallurgy cam and a preparation method thereof. Background technique [0002] Assembled powder metallurgy camshaft is a kind of decomposing camshaft into powder metallurgy cam, mandrel (generally steel pipe), journal and other parts that can be assembled, and the materials are optimized and finished separately, and then the cam is made through a specific process. A new camshaft preparation method that is connected with a mandrel to form a shaft. The method has the advantages of light weight, flexible design and processing, and good wear resistance, and is currently widely used in engines of automobiles and motorcycles. [0003] As we all know, the green body of powder metallurgy parts has low strength and high brittleness, so the cam green body is easy to break during transportation and assembly. At present, the assembled powder metallurgy camshaft needs to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F5/08
CPCB22F5/08B22F2998/10B22F1/10B22F3/16B22F3/02
Inventor 张少明张望王林山梁雪冰胡强汪礼敏
Owner GRIPM ADVANCED MATERIALS CO LTD
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