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Method for improving anti-friction and anti-wear performance of impactor piston

A technology of wear resistance and impactor, applied in the direction of coating, furnace type, furnace, etc., can solve problems such as weakening effect, and achieve the effect of improving service life, improving quality and prolonging working time.

Pending Publication Date: 2019-01-18
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ion sulfurized layer has excellent solid lubricating properties and anti-scratch properties, if the substrate is soft and cannot be well supported, its effect will be greatly weakened

Method used

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  • Method for improving anti-friction and anti-wear performance of impactor piston
  • Method for improving anti-friction and anti-wear performance of impactor piston
  • Method for improving anti-friction and anti-wear performance of impactor piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for improving the antifriction and wear resistance of 20Cr2Ni4 steel, specifically:

[0058] (1) Finely grind and polish the surface of 20Cr2Ni4 steel; heat the 20Cr2Ni4 steel to 930°C and keep it warm for 1h;

[0059] (2) Gas carburizing of 20Cr2Ni4 steel with endothermic atmosphere and methane, that is, strong carburizing for 6 hours at a carbon potential of 1.2% and a temperature of 930°C;

[0060] (3) Diffusion for 4 hours at a carbon potential of 0.8% and a temperature of 930°C;

[0061] (4) Pre-cool the 20Cr2Ni4 steel to 850°C, heat it for 1 hour and then oil quench it;

[0062] (5) Heat the 20Cr2Ni4 steel to 180°C for low-temperature tempering, and the heating time for tempering is 2h.

[0063] (6) the 20Cr2Ni4 steel after step (6) is cooled to room temperature, and its surface is finely ground and polished;

[0064] (7) Place 20Cr2Ni4 steel on the cathode tower of the ion sulfurization furnace body, connect the sample to the cathode of the ion sulfur...

Embodiment 2

[0066] A method for improving the antifriction and wear resistance of 20Cr2Ni4 steel, specifically:

[0067] (1) Finely grind and polish the surface of 20Cr2Ni4 steel; heat the 20Cr2Ni4 steel to 930°C and keep it warm for 1h;

[0068] (2) Gas carburizing of 20Cr2Ni4 steel with endothermic atmosphere and methane, that is, strong carburizing for 6 hours at a carbon potential of 1.2% and a temperature of 930°C;

[0069] (3) Diffusion for 4 hours at a carbon potential of 0.8% and a temperature of 930°C;

[0070] (4) Pre-cool the 20Cr2Ni4 steel to 850°C, heat it for 1 hour and then oil quench it;

[0071] (5) Heat the 20Cr2Ni4 steel to 180°C for low-temperature tempering, and the heating time for tempering is 2h.

[0072] (6) the 20Cr2Ni4 steel after step (6) is cooled to room temperature, and its surface is finely ground and polished;

[0073] (7) Place 20Cr2Ni4 steel on the cathode tower of the ion sulfurization furnace body, connect the sample to the cathode of the ion sulfur...

Embodiment 3

[0075] A method for improving the antifriction and wear resistance of 20Cr2Ni4 steel, specifically:

[0076] (1) Finely grind and polish the surface of 20Cr2Ni4 steel; heat the 20Cr2Ni4 steel to 930°C and keep it warm for 1h;

[0077] (2) Gas carburizing of 20Cr2Ni4 steel with endothermic atmosphere and methane, that is, strong carburizing for 6 hours at a carbon potential of 1.2% and a temperature of 930°C;

[0078] (3) Diffusion for 4 hours at a carbon potential of 0.8% and a temperature of 930°C;

[0079] (4) Pre-cool the 20Cr2Ni4 steel to 850°C, heat it for 1 hour and then oil quench it;

[0080] (5) Heat the 20Cr2Ni4 steel to 180°C for low-temperature tempering, and the heating time for tempering is 2h.

[0081] (6) the 20Cr2Ni4 steel after step (6) is cooled to room temperature, and its surface is finely ground and polished;

[0082] (7) Place 20Cr2Ni4 steel on the cathode tower of the ion sulfurization furnace body, connect the sample to the cathode of the ion sulfur...

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Abstract

The invention relates to a method for improving the anti-friction and anti-wear performance of an impactor piston. The method specifically comprises the steps that carburization treatment is conductedfirstly, and sulphurizing treatment is conducted after that. 20CR2Ni steel is accurately ground and polished, and then the surface of the steel is subjected to carburization treatment and low temperature ionic sulphurizing treatment in sequence. The obtained composite sulphurized layer surface is composed of tiny and compact spherical sulfide, and conglobated large particles of the sulfide are fewer. The composite sulphruized layer has good anti-friction performance under the mediate load, and when the load is too low or too high, the friction coefficient of the composite sulphurized layer issomewhat increased on the contrary. The carburized-sulphurized composite layer with a solid lubricating effect is prepared on the surface of a 20Cr2Ni4 steel impactor piston carburized layer, the service life of a piston is effectively prolonged, the working time of an impactor is prolonged, and the quality of an impactor product is improved greatly.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for improving the anti-friction and wear-resisting performance of an impactor piston. Background technique [0002] Hammers are not only widely used in surface mining, underground mining and quarrying, but also widely used in drilling, mineral exploration installations. The piston is one of the key components of the impactor, and it is also the most complex and fragile component. At present, there is a problem that the piston is severely worn and fails during use, and the main reason is the abrasion caused by lack of or no lubrication. [0003] The traditional strengthening methods for impactor pistons are carburizing, nitriding and quenching. [0004] The vulcanized layer formed by low-temperature ion sulfurization is loose and porous, which can store lubricating oil and form an adsorbed oil film to realize mixed lubrication of fluid lubrication and solid ...

Claims

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Application Information

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IPC IPC(8): C23C8/34C23C8/02C21D1/18C21D9/00
CPCC21D1/18C21D9/0068C23C8/02C23C8/34
Inventor 韩彬李美艳杨莹王稼林崔岗
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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