A processing method for a diesel engine valve seat

A processing method and technology of valve seats, which are applied in the manufacturing process of diesel engine valve seats, can solve problems such as high production costs, affecting equipment operation, and low bonding strength, so as to reduce production and manufacturing costs, improve product qualification rate, increase The effect of binding strength

Active Publication Date: 2021-06-22
CHONGQING YUEJIN MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this process, there are the following problems in the production of valve seats: after the alloy powder is heated by high-temperature and high-speed flame flow, it melts on the surface of the alloy powder particles, softens inside the particles, and collides with the base metal at a high speed, and the hardness often reaches 460. ~530HV, the bonding strength of the sprayed coating is only 67~78MPa for a long time, most of the products do not meet the drawing design requirements
It is precisely because of the high hardness, high brittleness, and low bonding strength of the sprayed coating that it is prone to peeling off during mechanical processing. The scrap rate of peeling off due to the use of traditional thermal spraying technology is as high as 31.7%. What is more serious is that users use it during use. Occasionally, the coating will peel off, affecting the normal operation of the equipment
In addition, plasma spraying or supersonic flame spraying equipment is complicated, with large investment and high production cost

Method used

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  • A processing method for a diesel engine valve seat

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, a method for processing a diesel engine valve seat, which includes the following steps.

[0033] 1) Surfacing welding on the cone surface, the cone surface of the inner hole of the diesel engine valve seat is subjected to surfacing welding, and the surfacing layer is obtained on the cone surface of the inner hole, and then the flaw detection is carried out.

[0034] 2) Spraying, flame-spray the inner hole of the valve seat of the diesel engine with nickel-based alloy powder, first clean the valve seat with acetone or alcohol to remove rust or burrs on the base of the valve seat, and then use 0.3Mpa compressed air and 200μm quartz sand For the inner hole of the jet valve seat, the surface roughness Ra of the inner hole to be sprayed is 3.3 μm, and then the air valve seat is cleaned with clean 0.2 MPa compressed air, and finally sprayed. The specific process parameters are: first, the diesel engine gas The valve seat is preheated to 105°C, then fixed on the ...

Embodiment 2

[0042] Embodiment 2, a method for processing a diesel engine valve seat, which includes the following steps.

[0043] 1) Surfacing welding on the cone surface, the cone surface of the inner hole of the diesel engine valve seat is subjected to surfacing welding, and the surfacing layer is obtained on the cone surface of the inner hole, and then the flaw detection is carried out.

[0044] 2) Spraying, flame-spray the inner hole of the valve seat of the diesel engine with nickel-based alloy powder, first clean the valve seat with acetone or alcohol to remove rust or burrs on the base of the valve seat, and then use 0.35Mpa compressed air and 160μm quartz sand For the inner hole of the jet valve seat, the surface roughness Ra of the inner hole to be sprayed is 3.2μm, and then the air valve seat is cleaned with clean 0.14MPa compressed air, and finally the spraying treatment is carried out. The specific process parameters are: first, the diesel engine gas The valve seat is preheate...

Embodiment 3

[0052] Embodiment 3, a method for processing a diesel engine valve seat, which includes the following steps.

[0053] 1) Surfacing welding on the cone surface, the cone surface of the inner hole of the diesel engine valve seat is subjected to surfacing welding, and the surfacing layer is obtained on the cone surface of the inner hole, and then the flaw detection is carried out.

[0054] 2) Spraying, flame-spray the inner hole of the valve seat of the diesel engine with nickel-based alloy powder, first clean the valve seat with acetone or alcohol to remove rust or burrs on the base of the valve seat, and then use 0.34Mpa compressed air and 190μm quartz sand For the inner hole of the jet valve seat, make the surface roughness Ra of the inner hole to be sprayed be 3.3 μm, then use clean 0.14MPa compressed air to clean the air valve seat, and finally carry out spraying treatment. The specific process parameters are: first, the diesel engine gas The valve seat is preheated to 80°C,...

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Abstract

The invention discloses a processing method for a diesel engine valve seat, which comprises the following steps: 1) surfacing welding on a cone surface; 2) spraying; 3) high-temperature diffusion, when the furnace temperature rises to 600-700°C, put the valve seat into Put it into the high-temperature furnace and heat it up to 1050~1100°C with the furnace, keep it warm for 50~70min, cool the furnace to 650~750°C and then air cool to room temperature; 4) Quenching and tempering, heating the valve seat of the diesel engine to 1060~1100°C , and then pre-cooled to 850~900°C for quenching treatment, the quenching medium is nitrate, the temperature of the nitrate is 350~400°C, after quenching for 15~30min, it is air cooled to 100~150°C, and then placed in the temperature ≥ 75°C Rinse in a sink, then temper at high temperature and cool in air. It can increase the bonding strength of the inner hole coating of the valve seat, reduce the hardness and brittleness of the coating, and improve the qualified rate of products.

Description

technical field [0001] The invention relates to a manufacturing process of a diesel engine valve seat, in particular to a processing method for a diesel engine valve seat. Background technique [0002] The valve seat is an important part of the diesel engine. During the working process, it bears the impact at high temperature, friction and wear, thermal fatigue and other complex working conditions and the erosion and corrosion of fuel exhaust gas. In order to ensure the safety and reliability of the diesel engine during use, in addition to making the valve seat base have high enough strength, plasticity and toughness through heat treatment, in addition to overlaying high hardness and wear-resistant superalloy on the conical surface of the inner hole of the valve seat, It is necessary to find a way to make the inner hole of the valve seat resistant to combustion exhaust gas corrosion, so as to ensure its service life. In recent years, the development of diesel engines has be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/001
Inventor 明国建
Owner CHONGQING YUEJIN MACHINERY
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