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Surface alloy strengthening method of aluminum-based piston ring grooves

A piston ring groove and surface alloy technology, which is applied in metal material coating process, fusion spraying, coating, etc., can solve the problems of thin surface strengthening layer, complex process, environmental pollution, etc., and achieve low cost and high process efficiency. Simple operation and high bonding strength

Active Publication Date: 2016-02-03
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, these methods generally have the disadvantages of thin surface strengthening layer, high cost, complicated process, and serious environmental pollution.

Method used

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  • Surface alloy strengthening method of aluminum-based piston ring grooves
  • Surface alloy strengthening method of aluminum-based piston ring grooves
  • Surface alloy strengthening method of aluminum-based piston ring grooves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1, determine the specific gravity of iron, nickel, chromium, tungsten, molybdenum and other elements, and mix the iron-based alloy powder (the content of nickel is 37%, the content of chromium is 15%, the content of molybdenum is 3%, and the rest is iron element) ;Dry and put into the powder feeder;

[0027] Step 2, use alcohol or kerosene to purify the upper, lower and inner surfaces of the aluminum-based piston ring groove to eliminate dirt and activate the surface; preheat the piston ring groove substrate to eliminate surface moisture and moisture, and improve the powder and The interface temperature when the surface of the ring groove is in contact can reduce the stress of the coating caused by the expansion of the substrate and avoid cracking of the coating. The aluminum-based piston head in the initial state is as figure 1 As shown, there are generally three ring grooves, the first and second are gas ring grooves, and the third is oil ring groove. Each annul...

Embodiment 2

[0035] Step 1, determine the specific gravity of iron, nickel, chromium, tungsten, molybdenum and other elements, and mix the iron-based alloy powder (the content of nickel is 37%, the content of chromium is 15%, the content of molybdenum is 3%, and the rest is iron element) ;Dry and put into the powder feeder;

[0036] Step 2, use alcohol or kerosene to purify the upper, lower and inner surfaces of the aluminum-based piston ring groove to eliminate dirt and activate the surface; preheat the piston ring groove substrate to eliminate surface moisture and moisture, and improve the powder and The interface temperature when the surface of the ring groove is in contact can reduce the stress of the coating caused by the expansion of the substrate and avoid cracking of the coating;

[0037] Step 3: Determine the plasma spraying process parameters according to the type of alloy powder, the structure of the ring groove and the performance of the spray gun. The voltage is controlled at ...

Embodiment 3

[0043]Step 1, determine the specific gravity of iron, nickel, chromium, tungsten, molybdenum and other elements, and mix the iron-based alloy powder (the content of nickel is 37%, the content of chromium is 15%, the content of molybdenum is 3%, and the rest is iron element) ;Dry and put into the powder feeder;

[0044] Step 2, use alcohol or kerosene to purify the upper, lower and inner surfaces of the aluminum-based piston ring groove to eliminate dirt and activate the surface; preheat the piston ring groove substrate to eliminate surface moisture and moisture, and improve the powder and The interface temperature when the surface of the ring groove is in contact can reduce the stress of the coating caused by the expansion of the substrate and avoid cracking of the coating;

[0045] Step 3: Determine the plasma spraying process parameters according to the type of alloy powder, the ring groove structure and the performance of the spray gun. The voltage is controlled at 85V, the...

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Abstract

A surface alloy strengthening method of aluminum-based piston ring grooves is characterized in that the method includes the following steps that firstly, matching is conducted on iron-based alloy powder; secondly, plasma spraying is conducted on the aluminum-based piston ring grooves; fourthly, remelting treatment is conducted on coatings and substrates through electronic beams; and fifthly, turning finishing is conducted on the aluminum-based piston ring grooves. According to the method, the plasma spraying technology and the electronic beam remelting reinforcing technology are combined, and the defects of holes and unmelted powder in the coatings and the like can be eliminated, so that reinforcing layers and the ring groove substrates can form stable and reliable metallurgical bonding, and bonding strength is high; and the overall process is easy to operate, low in cost and free of polluting the environment.

Description

technical field [0001] The invention relates to a surface treatment method of a piston ring groove, which is mainly used in an internal combustion engine. Background technique [0002] The piston is the most critical moving part of the internal combustion engine. It bears the action of repeated alternating loads under high temperature and high pressure, and is called the heart of the internal combustion engine. The failure of the piston is mainly caused by the abrasion of the contact surface of the ring groove that works with the piston ring at a temperature of 500-573K. [0003] Engine piston rings are responsible for sealing and heat transfer under high temperature, high pressure and high speed conditions. The piston ring fits closely with the piston ring groove, the sealing effect is good, the oil and gas in the combustion chamber are evenly mixed, the combustion is complete, the stored chemical energy can be fully converted into heat energy, and the exhaust gas has litt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C23C4/08C23C4/134C23C4/18
Inventor 沈正祥李亚哲刘峰涛王芳杨辉周克周春华陈炯袁书强
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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