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Novel process for making piston ring

A processing technology, piston ring technology, applied in the field of piston ring processing technology, can solve the problems of low bonding force between coating and substrate, high price, etc.

Inactive Publication Date: 2007-12-05
江苏仪征威龙活塞环有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its price is much higher than that of chrome-plated rings and molybdenum-sprayed rings, and the low bonding force between the coating and the substrate is still a major obstacle in its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Piston rings are processed by the following process steps:

[0015] Rough casting→grinding end face→heat treatment→machining both end faces→profiling rough turning outer circle→spraying alloyed coating→laser scanning→heat treatment→milling incision→rough boring→rough repairing→grinding outer circle→fine boring → Finishing mouth → Phosphating → Oiling.

[0016] The alloying coating contains (mass percent wt% of each element) 15% to 25% of carbon, 8% to 28% of silicon, 3% to 10% of boron, 2.5% to 7.5% of rare earth, 4% to 9% of molybdenum, Tungsten 10% to 28%, titanium 2% to 10%, cobalt 4% to 9%, nickel 4% to 9%. The coating thickness of the spray alloyed coating is 0.2 mm to 0.4 mm. Scan the laser beam along the circumference, and the power density of the laser scanning is 10 4 ~10 5 W / cm 2 .

[0017] The following table compares the main technical performance indicators of laser ceramic particle reinforced composite coating piston rings with similar products at ho...

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Abstract

The new process for piston ring processing relates to a machining process of piston rings. The process comprises the following steps: casting, grinding, heat treating, grinding again, metalworking, laser intensification processing, thermal shaping, and then metalworking again. Since the surface layer of the piston ring is alloyed by laser or executed laser melting-covering processing and then is flash molten through high-energy laser bean, the substrate of finite depth at external surface of the piston ring is flash molten and then solidifies to from specific ceramic granule reinforced composite coating. The coating layer and the piston ring body are of a metallurgy structure and will not fall off or peel off under exogenous process. It is easy to realize the industrialisation production of the present invention, the product possesses excellent anti-adhesive wear, resistance to abrasion grains and excellent technology stability.

Description

technical field [0001] The present invention relates to the processing technology of piston ring. Background technique [0002] The surface modification technology of piston rings mainly includes chrome plating and plasma spraying molybdenum for mass production. In addition, there are research reports at home and abroad on the preparation of wear-resistant coatings on the surface of piston rings by gas nitriding, vacuum plasma spraying, TiN plating and other physical vapor deposition (PVD), chemical vapor deposition (CVD), and some researches have been carried out. Small batch production and loading test, but their common is always complex equipment and process, poor technical stability, product testing difficulties, so it is difficult to control the quality of mass production, the coating prepared by these methods is very thin (2-10μm), It has a good effect on improving the early wear of the piston ring, but it has no obvious effect on improving the overall life of the pis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F5/00F16J9/26
Inventor 刘文今朱有慧马明星孙康和钟敏霖张伟明张锦英
Owner 江苏仪征威龙活塞环有限公司
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