A kind of sintered valve guide material and its preparation method

A valve guide and sintering time technology, applied in the valve guide related fields, can solve the problems affecting the longevity and safety of the valve guide, the valve guide is prone to wear, and the hardness is insufficient, and achieves easy promotion and use, high hardness, and production cost. low effect

Active Publication Date: 2021-06-04
ASIMCO SHUANGHUAN PISTON RING YIZHENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sintered valve guide material and its preparation method to solve the phenomenon that the valve guide mentioned in the above background technology is prone to wear and deformation due to insufficient hardness, which affects the long-term use of the valve guide sex and safety issues

Method used

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  • A kind of sintered valve guide material and its preparation method
  • A kind of sintered valve guide material and its preparation method
  • A kind of sintered valve guide material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A sintered valve guide material, made of sintered alloy, wherein the sintered alloy has a metallographic structure, which includes: pearlite phase, ferrite phase, pores, Fe-P-C compound phase, Cu-Sn alloy phase or Cu and Cu - the mixed structure of the Sn alloy phase and the dispersed graphite phase accounting for 1-2% of the mass ratio of the sintered alloy, and the at least one solid lubricant, the lubricant is distributed in the pores or the grain boundaries of the sintered alloy metallographic structure .

[0018] Among them, on the cross-section of the metallographic structure of the sintered alloy, the pearlite phase accounts for 50-85% of the matrix area, the Fe-P-C compound phase accounts for 8-25% of the cross-sectional area of ​​the metallographic structure, and the Cu-Sn alloy phase or Cu The mixed structure with Cu-Sn alloy phase accounts for 0.5-3% of the cross-sectional area of ​​the metallographic structure.

[0019] A preparation method of a sintered va...

Embodiment 2

[0026] It is basically the same as that of Example 1, furthermore, a preparation method of sintered valve guide material, the preparation method has the following steps:

[0027] A powder mixture was prepared, by mass, which included 1.2% Fe-P alloy powder, 4.1% Cu-Sn alloy powder, 1.7% C powder, 1% Si powder, 1.4% Ni powder and the balance Fe powder ; Wherein, Fe-P powder powder is made up of 16% phosphorus, unavoidable impurity and remainder iron; Cu-Sn alloy powder is made up of 10% tin, unavoidable impurity and remainder copper;

[0028] compressing the powder mixture in the tubular lumen, the powder mixture forms a tubular compact;

[0029] Then the tubular compacted body is sintered in a non-oxidizing atmosphere at a sintering temperature of 900°C;

[0030] Wherein the sintering time is 30 minutes;

[0031] The sintered body obtained by sintering is cooled at a cooling rate of 10° C. / minute or more.

[0032] The obtained valve guide was subjected to a wear test on a w...

Embodiment 3

[0037] It is basically the same as that of Example 1, furthermore, a preparation method of sintered valve guide material, the preparation method has the following steps:

[0038] A powder mixture was prepared, by mass, which included 1.5% Fe-P alloy powder, 4.5% Cu-Sn alloy powder, 1.9% C powder, 1.5% Si powder, 1.6% Ni powder and the balance Fe powder ; Wherein, Fe-P powder powder is made up of 16% phosphorus, unavoidable impurity and remainder iron; Cu-Sn alloy powder is made up of 10% tin, unavoidable impurity and remainder copper;

[0039] compressing the powder mixture in the tubular lumen, the powder mixture forms a tubular compact;

[0040] Then the tubular compacted body is sintered in a non-oxidizing atmosphere at a sintering temperature of 950°C;

[0041] Wherein the sintering time is 40 minutes;

[0042] The sintered body obtained by sintering is cooled at a cooling rate of 10° C. / minute or more.

[0043] The obtained valve guide was subjected to a wear test on a...

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Abstract

The invention discloses a sintered valve guide material, which is made of sintered alloy, and the sintered alloy consists of C: 1.3-3%, Cu: 3.17-5.0%, P: 0.16-0.29%, Sn: 0.41-0.52%, Cr: 2%-5%, Mo: 5%-7%, greater than or equal to 0.15% lubricant and the balance is composed of Fe and unavoidable impurities, by mass, wherein the sintered alloy has a metallographic structure, which includes: pearlite phase, ferrite phase, pores, Fe-P-C compound phase, Cu-Sn alloy phase or mixed structure of Cu and Cu-Sn alloy phase and the dispersed graphite phase accounting for 1-2% of the mass ratio of sintered alloy and the described At least one solid lubricant, the lubricant is distributed in the pores or in the grain boundaries of the sintered alloy metallographic structure. The present invention manufactures the valve guide by adopting the sintering process, so that the valve guide can have good and balanced wear resistance, better self-lubricating performance, and higher hardness, thereby increasing its long-term use and safety Sex, and the production cost of the present invention is low, is convenient to popularize and use.

Description

technical field [0001] The invention relates to the related technical field of valve guides, in particular to a sintered valve guide material and a preparation method thereof. Background technique [0002] The valve guide is the guide device for the valve of the automobile engine. The function of the valve guide is to guide the movement of the valve. The valve guide supports and guides the reciprocating valve in it, ensuring that the valve and the valve seat can fit correctly and make the valve The heat on the rod is transmitted to the cylinder head through the valve guide, which is an important part that guides the opening and closing movement of the engine valve. [0003] Due to the high working temperature of the valve guide, and the valve guide is prone to wear due to long-term reciprocating motion, it is easy to deform due to insufficient hardness due to wear, which affects the durability and safety of the valve guide, and needs to be improved. . Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/36C22C38/22C22C38/20C22C33/02
CPCC22C33/0207C22C33/0278C22C38/002C22C38/008C22C38/20C22C38/22C22C38/36
Inventor 李开顺陈荣敏代东华
Owner ASIMCO SHUANGHUAN PISTON RING YIZHENG
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