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Method for enhancing hardness of valve face of lift valve

A technology of poppet valve and valve surface, which is applied in the direction of poppet valve, valve device, engine components, etc., and can solve the problem of reducing the sealing performance

Inactive Publication Date: 2018-04-24
重庆华厦新力新能源汽车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the case of exhaust valves of marine diesel engines with low-quality fuel, the entry of combustion residues into the valve surfaces can cause compression of the surfaces and reduce the tightness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0004] A method for enhancing the hardness of the valve face of a poppet valve made of a thermal resistance alloy, the poppet valve has a valve head with a valve face, the method includes the following steps: A protrusion is formed at the center of the protrusion, and the middle part of the protrusion has the largest processing rate expressed by a percentage. The processing rate is the height difference between the protrusion and the valve surface divided by the height of the protrusion. The processing of the protrusion The ratio gradually decreases toward the end of the inner and outer circumferences; and the protrusion is pressurized to make it deform and enhance the hardness of the valve surface.

[0005] The maximum machining rate in the middle of the protrusion is 30-55%, and the machining rate near the inner peripheral end of the protrusion is 6-9.5%.

[0006] The longitudinal section of the protrusion is an isosceles triangle, and the apex is in the middle of the protru...

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PUM

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Abstract

The invention discloses a method for enhancing hardness of a valve face of a lift valve. The method comprises the steps that a protrusion part is formed in a valve head of the lift valve used in an internal combustion engine, the longitudinal section of the protrusion part is in an isosceles triangle shape, and the vertex is arranged in the middle portion of the protrusion part; and the protrusionpart is pressurized in a hole opening of a punching die so that the protrusion part can be plastically deformed, then the valve face is formed at the position, in contact with a valve seat, of the protrusion part, and a proper air tightness is obtained between the valve face and the valve seat.

Description

technical field [0001] The invention relates to a method for enhancing the hardness of a poppet valve surface to obtain higher hardness and stable quality. Background technique [0002] The valve face of an intake or exhaust valve used in an internal combustion engine is repeatedly coupled to a valve seat while maintaining airtightness, so abrasion resistance is required. Especially in the case of exhaust valves of marine diesel engines with low-quality fuel, the penetration of combustion residues into the valve surfaces can cause compression of the surfaces, reducing the tightness. Therefore, high hardness is required. Contents of the invention [0003] The object of the present invention is to propose a method for enhancing the hardness of the poppet valve face, and keep the hardness of the entire valve face uniform, so as to prevent the local wear of the valve face or the valve seat, thereby providing Sufficient airtightness. detailed description [0004] A method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L3/20F01L3/02
CPCF01L3/02F01L3/20F01L2303/00
Inventor 刘存福
Owner 重庆华厦新力新能源汽车有限公司
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