Engine valve guide tube of composite powder metallurgy material and its manufacture

An engine valve and composite material technology, which is applied to engine components, machines/engines, mechanical equipment, etc., can solve the problems that the valve cannot be opened and closed normally, affect the performance of the engine, and the utilization rate of materials is low, so as to save the machining process. , the effect of material saving and simple preparation method

Inactive Publication Date: 2002-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing engine valve guide cylinder parts are usually made of forged alloy steel, such as (12CrNi3A steel, etc.) through machining, heat treatment and other processes, the material utilization rate is low, the process is complicated, and the valve guide cylinder parts are worn during use. Seriously, the top of the valve guide cylinder is sometimes worn through by the cam, so that the valve cannot be opened and closed normally, which seriously affects the performance of the engine. For high-power engines, the situation is even more serious

Method used

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  • Engine valve guide tube of composite powder metallurgy material and its manufacture
  • Engine valve guide tube of composite powder metallurgy material and its manufacture
  • Engine valve guide tube of composite powder metallurgy material and its manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] ——Prepare powder material A according to the following components and their mass percentage content:

[0044] Composition Particle size Mass percentage dosage

[0045] Iron powder ≤147 83%

[0046] Copper powder ≤74 0.5%

[0047] Nickel powder 2 2.0%

[0048] Molybdenum powder ≤74 0.5%

[0049] Graphite powder ≤74 1.0%

[0050] Ferrophosphorus powder ≤74 2.4%

[0051] Niobium carbide powder 4 10%

[0052] Acla powder ≤38 0.6% Prepare powder material B according to the following components and their mass percentages:

[0053] Composition Particle size Mass percentage dosage

[0054] Iron powder ≤147 76%

[0055] Copper powder ≤74 2.0%

[0056] Nickel powder 2 2.0%

[0057] Molybdenum powder ≤74 1.0%

[0058] Graphite powder ≤74 1.0%

[0059] Phosphorus iron or phosphor copper powde...

Embodiment 2

[0069] ——Prepare powder material A according to the following components and their mass percentage content:

[0070] Composition Particle size Mass percentage dosage

[0071] Iron powder ≤147 75%

[0072] Copper powder ≤74 2.0%

[0073] Nickel powder 2 3.0%

[0074] Molybdenum powder ≤74 0.9%

[0075] Graphite powder ≤74 0.8%

[0076] Phosphor copper powder ≤74 4.5%

[0077] Niobium carbide powder 4 12%

[0078] Akela powder ≤38 0.8% Prepare powder material B according to the following components and their mass percentages:

[0079] Composition Particle size Mass percentage dosage

[0080] Iron powder ≤147 65%

[0081] Copper powder ≤74 4.0%

[0082] Nickel powder 2 3.0%

[0083] Molybdenum powder ≤74 2.0%

[0084] Graphite powder ≤74 0.5%

[0085] Phosphorus iron or phosphor copper powd...

Embodiment 3

[0094] ——Prepare powder material A according to the following components and their mass percentage content:

[0095] Composition Particle size Mass percentage dosage

[0096] Iron powder ≤147 86%

[0097] Copper powder ≤74 1.5%

[0098] Nickel powder 2 1.0%

[0099] Molybdenum powder ≤74 1.0%

[0100] Graphite powder ≤74 0.5%

[0101] Phosphor copper powder ≤74 4.5%

[0102] Niobium carbide powder 4 5.0%

[0103] Acla powder ≤38 0.5% Prepare powder material B according to the following components and their mass percentages:

[0104] Composition Particle size Mass percentage dosage

[0105] Iron powder ≤147 78%

[0106] Copper powder ≤74 2.2%

[0107] Nickel powder 2 4.0%

[0108] Molybdenum powder ≤74 1.5%

[0109] Graphite powder ≤74 1.5%

[0110] Ferrophosphorus powder ≤74 2.0%

[...

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Abstract

The engine valve guide tube has its top made of material B and other parts made of material A. The material A consists of Cu 0.5-2 wt%, Ni 1-3 wt%, Mo 0.5-1 wt%, C 0.5-1 wt%, NbC 5-12 wt% and P 0.3-0.6 wt% other than Fe and inevitable impurity; and the material B consists of Cu 2-4 wt%, Ni 2-4 wt%, Mo 1-2 wt%, C 0.5-1.5 wt%, NbC 10-20 wt% and P 0.3-0.6 wt% other than Fe and inevitable impurity. It is manufactured through the processes of compounding material, mixing, hot pressing to form and sintering to obtain product. The valve guide tube manufactured through once pressing and sintering hashigh strength and high hardness and wear resistance.

Description

technical field [0001] The invention relates to a powder metallurgy material and a preparation method, in particular to a powder metallurgy composite material engine valve guide cylinder made of powder metallurgy composite material and a preparation method thereof. Background technique [0002] The existing engine valve guide cylinder parts are usually made of forged alloy steel, such as (12CrNi3A steel, etc.) through machining, heat treatment and other processes, the material utilization rate is low, the process is complicated, and the valve guide cylinder parts are worn during use. Seriously, the top of the valve guide cylinder is sometimes worn through by the cam, so that the valve cannot be opened and closed normally, which seriously affects the performance of the engine. For high-power engines, the situation is even more serious. Contents of the invention [0003] The purpose of the present invention is to use powder metallurgy technology to overcome the problems exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C7/00C22C33/02C22C38/16F01L3/02
Inventor 李元元肖志瑜夏伟龙雁吴苑标
Owner SOUTH CHINA UNIV OF TECH
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