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Re-melted and hardened natural gas engine aluminum alloy piston

A technology for engines and natural gas, which is applied in the field of aluminum alloy pistons of natural gas engines, can solve problems such as cracking, and achieve the effects of increased strength, improved service life, and reliable bearing

Inactive Publication Date: 2015-04-15
DONGFENG PISTON & BEARING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strengthening of the engine enables the piston to work in harsher environments and conditions, resulting in cracks at the arc corners at the bottom of the piston bowl-shaped combustion chamber

Method used

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  • Re-melted and hardened natural gas engine aluminum alloy piston
  • Re-melted and hardened natural gas engine aluminum alloy piston

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Effect test

Embodiment Construction

[0012] Such as figure 1 and 2 As shown, a remelted and strengthened natural gas engine aluminum alloy piston includes a piston body and a combustion chamber on the top. An annular remelted strengthening layer is provided at the arc corner of the bottom of the combustion chamber. The cross section of the remelting strengthening layer is an arc shape; the depth C of the remelted strengthening layer, C is 2 ~ 9mm; the radial width W of the remelting strengthening layer, W is 2 ~ 10mm; the axial height H of the remelting strengthening layer, H is 2~10mm.

[0013] A method for remelting and strengthening aluminum alloy pistons of natural gas engines, the specific steps are: (1), pretreatment: cleaning, degreasing and descaling the roughly processed piston blanks, and then heat preservation treatment at 50-150°C 0.5~1.5 hours; （ 2) Remelting treatment: Use tungsten argon arc welding method to remelt the arc corner at the bottom of the piston combustion chamber, fix the welding to...

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Abstract

A re-melted and hardened natural gas engine aluminum alloy piston comprises a piston body and a top combustion chamber. An annular re-melted and hardened layer is arranged at an arc corner of the bottom of the combustion chamber, the cross section of the re-melted and hardened layer is a circular arc, the particle size of a metallographic structure primary silicon phase and an intermetallic phase of a reinforced annular area is 1 / 4-1 / 10 that of a non-re-melted portion of a matrix after the arc corner of the bottom of the combustion chamber of the piston is re-melted, so that the thermal fatigue resistance of the piston is improved, mechanical load and thermal load generated in operation of an engine are more reliably borne, thermal fatigue resistance experiment results indicate that the thermal fatigue resistance life of the reinforced annular area can be prolonged by about 2-5 times, and the service life of the piston is greatly prolonged in practical use.

Description

technical field [0001] The invention relates to an aluminum alloy piston, in particular to a remelted and strengthened aluminum alloy piston for a natural gas engine. Background technique [0002] Natural gas is a new type of clean fuel. As a new type of energy engine, natural gas engine is economical and emits less pollutants. It is an important measure to realize energy saving and emission reduction of automobiles. At present, the piston material of a natural gas engine is mainly made of aluminum-silicon alloy, and the structure of the piston combustion chamber is generally a bowl-shaped structure. As one of the core key components of the engine, the degree of strengthening of the piston often restricts the degree of strengthening of the engine and the economy of the engine. In order to further improve the economy of the natural gas engine and reduce emissions, the natural gas engine adopts in-cylinder direct injection and high-voltage electronic control injection. And ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/14F02F3/26
CPCF02F3/0084F02F3/14F02F3/26F02F2003/0007F02F2200/00
Inventor 袁国民郑思乐范海民赵敏岳济余鑫
Owner DONGFENG PISTON & BEARING
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