Hot working technology for 4Cr14Ni14W2Mo air valve

A thermal processing and gas valve technology, which is applied in the field of thermal processing of 4Cr14Ni14W2Mo diesel engine gas valves, can solve problems such as valve safety, reliability, service life is not ideal, design requirements cannot be met, and tensile strength of strength indicators is unqualified, etc. , to achieve reasonable distribution of precipitated phases, increase in tensile strength and yield strength, and increase in service life and reliability

Active Publication Date: 2018-01-12
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] From the above situation, it can be seen that the strength index (including tensile strength σb and yield strength σ0.2) is unqualified and cannot meet the design requirements
This has caused the safety, reliability and service life of the air valve to be unsatisfactory.

Method used

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  • Hot working technology for 4Cr14Ni14W2Mo air valve
  • Hot working technology for 4Cr14Ni14W2Mo air valve
  • Hot working technology for 4Cr14Ni14W2Mo air valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of thermal processing technology of 4Cr14Ni14W2Mo gas valve, comprises the following steps:

[0035] The first step: Upsetting the rough blank of the valve;

[0036] The air valve rough blank with garlic head is made by upsetting round bar. The diameter of the garlic head of the air valve rough blank is smaller than the valve disc diameter of the air valve blank, and the diameter of the stem part of the air valve rough blank is larger than the valve of the air valve blank. rod diameter, figure 1 Air valve blank shown, figure 2 Air valve blank shown.

[0037] The second step: solid solution;

[0038] A through-type continuous operation high-temperature furnace is used to load a rough billet of air valve every 90 seconds, and keep warm at 1180°C for 1.5 hours in sequence, and the furnace is loaded first and the furnace is taken out in sequence every 90 seconds. , and then air-cooled for 6 seconds after the water outlet, at this time the surface temperature of ...

Embodiment 2

[0046] A kind of thermal processing technology of 4Cr14Ni14W2Mo gas valve, comprises the following steps:

[0047] The first step: Upsetting the rough blank of the valve;

[0048] The air valve rough blank with garlic head is made by upsetting round bar. The diameter of the garlic head of the air valve rough blank is smaller than the valve disc diameter of the air valve blank, and the diameter of the stem part of the air valve rough blank is larger than the valve of the air valve blank. rod diameter, figure 1 Air valve blank shown, figure 2 Air valve blank shown.

[0049] The second step: solid solution;

[0050] A through-type continuous operation high-temperature furnace is used to load a rough billet of air valve every 100 seconds, and keep warm at 1165°C for 105 minutes in sequence, and the furnace is loaded first and then taken out in sequence every 100 seconds, and the workpieces after being released from the furnace are quickly cooled in water for 6 seconds , and t...

Embodiment 3

[0058] A kind of thermal processing technology of 4Cr14Ni14W2Mo gas valve, comprises the following steps:

[0059] The first step: Upsetting the rough blank of the valve;

[0060] The air valve rough blank with garlic head is made by upsetting round bar. The diameter of the garlic head of the air valve rough blank is smaller than the valve disc diameter of the air valve blank, and the diameter of the stem part of the air valve rough blank is larger than the valve of the air valve blank. rod diameter, figure 1 Air valve blank shown, figure 2 Air valve blank shown.

[0061] The second step: solid solution;

[0062] A through-type continuous operation high-temperature furnace is used to load a rough billet of air valve at an interval of 95 seconds, and keep warm at 1150°C for 2 hours in sequence, and the furnace is loaded first and then taken out in sequence at an interval of 95 seconds, and the workpiece after being released from the furnace is quickly cooled in water for 5 ...

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Abstract

The invention discloses a hot working technology for a 4Cr14Ni14W2Mo air valve, and belongs to the technical field of working technologies. The hot working technology comprises the following steps of1 air valve rough blank upsetting, 2 solid solution, 3 strain strengthening and 4 aging treatment. According to the technology, air valve rough blank upsetting and strain strengthening are additionally conducted on the basis of traditional solid solution and aging treatment, and the water cooling time, the air cooling time, the initial forging temperature, the forging frequency and the deformationwhich are generated before valve rod portion and garlic head portion forging machining are strictly controlled. According to the technology, the tensile strength and the yield strength of the 4Cr14Ni14W2Mo air valve can be significantly improved, the plasticity indexes (including the percentage elongation after fracture and the percentage reduction of area) are not decreased or slightly increased, the metallographic structure is more ideal, and the 4Cr14Ni14W2Mo air valve produced through the technology has the advantages that the fatigue strength, the safety and the reliability are significantly improved, and the service life is significantly prolonged.

Description

technical field [0001] The invention belongs to the technical field of processing technology, and in particular relates to a thermal processing technology of a 4Cr14Ni14W2Mo diesel engine gas valve. Background technique [0002] The 4Cr14Ni14W2Mo steel valve is one of the key moving parts of the heart of the diesel engine, and it is also its basic part and vulnerable part. [0003] As the "heart" moving part, it is the key moving part that determines the performance and reliability of the diesel engine. [0004] As a basic part, it plays a very important role in the maintenance cycle and service life of the diesel engine. [0005] If the gas valve fails during the service life, it will directly cause serious consequences such as deformation or even damage of the cylinder, piston, supercharger and other components on the diesel engine, which will cause huge economic losses to the user. [0006] Since the air valve is a consumable part and is located in the "heart", the dies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 明国建
Owner CHONGQING YUEJIN MACHINERY
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