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Light and wear-resistant automobile engine piston and preparing method thereof

An automotive engine and engine technology, applied in engine components, machines/engines, pistons, etc., can solve the problems of difficult to meet the new standard engine, difficult to increase power, high noise, etc., achieve excellent mechanical properties and service performance, reduce cracks and Shrinkage, the effect of increasing heat resistance

Inactive Publication Date: 2016-03-23
NINGBO QUNXING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This large cylinder matching gap causes the engine to have large vibration, noise, and emission during operation, and it is difficult to increase the power, which is difficult to meet the requirements of the new standard engine.

Method used

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  • Light and wear-resistant automobile engine piston and preparing method thereof
  • Light and wear-resistant automobile engine piston and preparing method thereof
  • Light and wear-resistant automobile engine piston and preparing method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0044] The steps of the preparation method are as follows:

[0045] S1. The aluminum alloy powder, ceramic powder, porogen, and binder are mixed in proportions, and after the mixing is uniform, they are pressed into a green engine piston under a pressure of 300-450Mpa;

[0046] S2, in hollow ZrO 2 Add resin binder to the powder and mix well, then mix the hollow ZrO 2 The powder is coated on the top of the green engine piston head;

[0047] S3. The green body in step S2 is pre-fired at 300-450Mpa pressure and 450-500℃ for 25-35min; then under 450-500Mpa pressure at a rate of 5℃ / min to 630℃, 650℃, 670 ℃, 690℃, hold for 0.5h, 0.5h, 0.6h, 0.8h respectively, and then cool to room temperature to get a layer of hollow ZrO on the top of the head 2 Engine piston with ceramic insulation;

[0048] S4. For the hollow ZrO in step S3 2 The ceramic heat insulation layer is scanned by laser to obtain the finished product of light and wear-resistant automobile engine piston.

Embodiment 1

[0051] The head and skirt of the engine piston in this embodiment are made of aluminum alloy ceramic porous material, and the aluminum alloy ceramic porous material is made of aluminum alloy powder, ceramic powder, porogen and binder. The porosity of the aluminum alloy ceramic porous material is 55.4%, and the pore size is 13.1 μm.

[0052] The engine piston of the present invention is prepared by the following method:

[0053] The aluminum alloy powder, ceramic powder, porogen and binder are mixed according to a mass ratio of 100:55.1:0.4:9, and pressed into a green engine piston under a pressure of 300Mpa; among them, the aluminum alloy powder consists of the following mass percentages Component composition: 19.3% Si, 0.9% Cu, 1.1% Mg, 0.6% Ni, 0.20% Mn, 0.20% Ti, 0.05% C, 0.3% Bi, 0.05% Fe, 0.7% Re, the balance is Al and not Impurities to avoid; ceramic powder includes 50% w / w β-SiC and 50% w / w HBN; porogen is 12% of the total mass of the mixture TiH 2 , 40% SrCO3, 48% azodicar...

Embodiment 2

[0058] The head and skirt of the engine piston in this embodiment are made of aluminum alloy ceramic porous material, and the aluminum alloy ceramic porous material is made of aluminum alloy powder, ceramic powder, porogen and binder. Among them, the porosity of the aluminum alloy ceramic porous material is 62.4%, and the pore size is 17.3 μm.

[0059] The engine piston of the present invention is prepared by the following method:

[0060] The aluminum alloy powder, ceramic powder, porogen and binder are mixed in a mass ratio of 100:75.2:0.6:10, and pressed into a green engine piston under a pressure of 380Mpa; among them, the aluminum alloy powder consists of the following mass percentages Component composition: 20.3% Si, 1.0% Cu, 1.6% Mg, 0.9% Ni, 0.28% Mn, 0.27% Ti, 0.06% C, 0.3% Bi, 0.09% Fe, 0.9% Re, the balance is Al and not Avoided impurities; ceramic powder package 54% w / w β-SiC and 46% w / w HBN; porogen is ZrH which accounts for 13% of the total mass of the mixture 2 , 42%...

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Abstract

The invention relates to a light and wear-resistant automobile engine piston and a preparing method thereof and belongs to the technical field of piston machining. A head and a skirt part connected to the lower end of the head are reserved on the automobile engine piston. The head is provided with an oil ring groove and a gas ring groove in sequence from bottom to top. A radial small hole is formed in the bottom face of the oil ring groove. Two opposite pin holes are formed in the two sides of the skirt part. The engine piston is made of an aluminum alloy ceramic porous material which includes aluminum alloy powder, ceramic powder, a pore-forming agent and a binding agent with the mass ratio of 100:(55.1-165.2):(0.4-0.9):(9-12). The piston prepared through the method is good in mechanical property, good in thermal shock resisting property, low in noise, small in specific gravity and convenient o use and transport.

Description

Technical field [0001] The invention belongs to the technical field of piston processing, and relates to a light wear-resistant automobile engine piston and a preparation method thereof. Background technique [0002] The piston is called the heart of the engine. It is one of the most important parts in the engine. Its function is to withstand the gas pressure and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate. When the engine is working, the piston is in direct contact with high-temperature gas with an instantaneous temperature of 2200 degrees Celsius. The top temperature of the piston reaches 300℃~400℃, and the temperature distribution is uneven; the top of the piston bears a large gas pressure during the work stroke, and the gasoline engine reaches 4MPa ~5MPa, diesel engine is as high as 8MP~9MPa, or even higher; in addition, the linear velocity of the piston reciprocating in the cylinder can reach 11m / s~16m / s; it works under such h...

Claims

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Application Information

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IPC IPC(8): F02F3/00F02F3/12C22C21/02B22F3/16B22F1/00
Inventor 潘成群
Owner NINGBO QUNXING POWDER METALLURGY
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