Valve finisher surface modified processing method

A technology of surface modification and processing method, which is applied in the direction of metal processing equipment, metal material coating technology, coating, etc., can solve the problems of reduced mold life, increased mold cost, significant mold collapse and wear, and achieves improved resistance Effects of crushing, improving thermal fatigue performance, and reducing wear

Inactive Publication Date: 2005-01-26
SHANGHAI UNIV
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the valve is made of heat-resistant stainless steel, high-temperature alloy and other materials, its thermal deformation resistance is improved, but the collapse and wear of the mold become more significant
If the heat treatment process is adjusted to adjust the plasticity and toughness of the hot work die steel and obtain high strength to improve the ability of the die to resist compression and wear, it cannot fundamentally solve the problem of the obvious decline in the life of the die
[0004] In addition, high-speed steel with better thermal strength and even powder alloy are used to manufacture valve precision forging dies. Since high-speed steel and powder alloy materials can still maintain high hardness at high temperatures, the collapse and wear of the die are controlled. , but the ability of these materials to withstand alternating cold and heat shocks is relatively poor, and the thermal fatigue on the mold surface occurs and develops faster
Moreover, the use of high-speed steel, especially powder alloy molds, will greatly increase the cost of molds

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: the specific technological process and technological steps of the embodiment of the present invention are as follows:

[0018] 1) The valve fine-blanking die made of hot work die steel is put into special plasma heat treatment equipment after quenching and tempering, and the nitrogen-containing atmosphere mainly composed of ammonia gas is first introduced, and plasma infiltration is carried out at a temperature of 530°C for 5 hours. nitrogen treatment.

[0019] 2) At the end of plasma nitriding, feed ammonia gas and acetone mixed gas, the volume ratio of ammonia gas and acetone gas is 7.5:1, and carry out plasma nitrocarburizing treatment at the same temperature of 530° C. for 2 hours.

[0020] 3) Then put the mold into a steam oxidation furnace, and carry out surface oxidation treatment on the mold under a steam pressure of 0.15 MPa and a temperature of 530°C.

[0021] 4) After the above composite process, the surface of the mold is uniform blue-gray, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a surface modification processing method for the engine critical component, which belongs to the field of the steel surface chemistry thermal treatment processing technology. The processing method comprises: nitriding for the air valve finisher by using the plasma technology, adding carbon-containing gas in the nitrogen-containing gas at the late stage of nitriding and carrying out the nitrocarburizing, and placing the mould in the steam oxidizing furnace for surface oxidizing treatment. The mould treated by said technology has excellent mechanical property, improved surface hardness, improved compression resistance, improved wear resistance and improved thermal fatigue resistance.

Description

technical field [0001] The invention relates to a surface modification treatment processing method of a precision forging die of a valve, a key component of an engine, and belongs to the technical field of steel surface chemical heat treatment processing. Background technique [0002] Valves are key parts of various engines and are widely used in industries such as automobiles, aircraft, agricultural machinery and ships. When the valve is scoured by high-temperature gas and the friction and wear of the valve seat, it is easy to fail and be scrapped. In order to improve the performance of the valve, its material selection has gradually changed from carburizing steel to heat-resistant stainless steel and high-temperature alloy. The new materials used in the valves generally have higher high-temperature strength than conventional materials, and their resistance to thermal deformation is increased accordingly. [0003] Valve precision forging dies are generally made of hot work...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02C23C8/06C23C8/34C23C8/36
Inventor 闵永安吴晓春许珞萍李麟王荣
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap