Valve bush carbonitriding thermal treatment process for high-pressure common rail

A high-pressure common rail and carbonitriding technology, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., to shorten labor time, reduce quenching deformation and cracking tendency, and improve hardenability.

Inactive Publication Date: 2015-12-16
SHANDONG LIAOCHENG DERUN EMT DEVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the original heat treatment technologies used above are very important for increasing the wear resistance of the valve sleeve, especially for the wear resistance of the valve sleeve under high temperature working conditions, the stability of the size and precision of the valve sleeve, and prolonging the service life. All aspects have not been fundamentally resolved

Method used

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  • Valve bush carbonitriding thermal treatment process for high-pressure common rail
  • Valve bush carbonitriding thermal treatment process for high-pressure common rail
  • Valve bush carbonitriding thermal treatment process for high-pressure common rail

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one, preferably, the heat preservation time in step one is 160 minutes.

Embodiment 2

[0037] Embodiment 2, preferably, in step 2, the input rate of ammonia gas is 4 L / min, the input rate of propane is 10 L / min, and the input rate of methanol is 20 L / min.

Embodiment 3

[0038] Embodiment three, the tempering time in preferred step six is ​​165 minutes.

[0039] Further, the valve sleeve of the high-pressure common rail is made of GCr15 material.

[0040] Further, as image 3 , Figure 4 As shown, the station is a processing frame with an open top. In order to ensure the uniformity of carbonitriding, the bottom of the processing frame is flat, and the bottom and surroundings of the processing frame are hollow structures. The station Made of high-temperature-resistant stainless steel, the high-pressure common rail valve sleeves are laid flat and scattered in the processing frame.

[0041] Each process of the above heat treatment process is carried out on the automatic line of the multi-purpose furnace. The temperature control and programmed automatic operation are set by computer, and the process parameters can be monitored from the automatic recorder.

[0042]The high-pressure common rail valve sleeve products made of ball bearing steel (GC...

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Abstract

The invention provides a valve bush carbonitriding thermal treatment process for a high-pressure common rail. The process mainly solves the problems that an existing valve bush is poor in abrasion resistance, low in dimensional accuracy and short in service life. The process includes the steps of firstly, stress relief annealing, secondly, carbonitriding, thirdly, quenching treatment, fourthly, washing and drying, fifthly, freezing treatment and sixthly, tempering treatment. By the adoption of the valve bush carbonitriding thermal treatment process, the abrasion resistance of the valve bush is reinforced, the size accuracy of the valve bush is improved, and the service life of the valve bush is prolonged.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology, in particular to a carbonitriding heat treatment technology of a high-pressure common rail valve sleeve. Background technique [0002] Valve sleeves for high pressure common rail (such as figure 1 ) is an important part of the vehicle engine fuel injection system, and it is also a wearing part, which needs to be replaced in time after wear and tear. It is made of ball bearing steel (GCr15) and assembled in the oil chamber of the common rail injector body. It can control the one-time injection quantity of fuel in the vehicle engine fuel injection system and improve the fuel deflagration rate. effect. Although the structure of the high-pressure common rail valve sleeve is relatively simple, because it is installed and worked in a high-pressure (above 200MPa) working environment, it needs to have excellent wear resistance, high temperature resistance and impact resistance, as wel...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C8/56C21D1/30C21D1/18C21D9/00
Inventor 谢成华武及峰李志民
Owner SHANDONG LIAOCHENG DERUN EMT DEVING
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