Method for removing oxide film on inner wall of piston ring
A piston ring and oxide film technology is applied in the field of removing the oxide film on the inner wall of the piston ring to achieve the effects of improving the contact pressure distribution, reducing the scrap rate and simplifying the process.
Inactive Publication Date: 2016-10-05
重庆广鼎道路设施有限公司
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AI Technical Summary
Problems solved by technology
[0004] The technical problem to be solved by the present invention is to improve the existing method for removing the oxide film on the inner wall of the piston ring, solve the distortion of the piston ring, and improve the production accuracy
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0007] The present invention will be further described below in conjunction with embodiment:
[0008] A piston ring heat treatment process, comprising the following steps:
[0009] S1, remove the oxide film on the inner wall of the piston ring. Through this process, the oxide film on the inner wall of the piston ring (inner circle side wall) is removed to ensure that the target material can penetrate into the inner circle side wall of the piston ring in subsequent heat treatment processes such as nitriding and carburizing to ensure the inner and outer circles of the piston ring. The side wall can be treated evenly, thereby improving the contact pressure distribution of the piston ring and avoiding the occurrence of two types of distortions, "neck" and "light leakage".
[0010] Specifically, the method of removing the oxide film on the inner wall of the piston ring can be sandblasting or grinding. Taking the sandblasting process as an example, corundum or quartz sand with a p...
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Abstract
The invention discloses a method for removing an oxide film on the inner wall of a piston ring. According to the method, carborundum or quartz sand with a particle size of 9 to 70 meshes is employed for abrasive blasting of the inner wall of the piston ring under the conditions of an air pressure of 0.3 to 1.2 MPa, abrasive blasting distance of 15 to 23 cm and abrasive blasting time of 2 to 25 min so as to remove the oxide film with a thickness of 0.5 to 4 mm on the inner wall of the piston ring. As the procedure of removal of the oxide film on the inner wall of the piston ring is additionally carried out before heat treatment, the inner circular sidewall and the outer circular sidewall of the piston ring are adequately treated at the same time, so distribution of contact pressure of the piston ring is improved, and the problem of unbalanced residual stress caused by one-side nitriding and carburizing of the outer circular sidewall of the piston ring is overcome; and thus, two distortions consisting of necking-down and light leakage after heat treatment of the piston ring are substantially overcome, the precision of the piston ring is guaranteed, and the rejection rate of piston rings after heat treatment is obviously reduced. The method for removing the oxide film on the inner wall of the piston ring is simple in procedure, does not need precise equipment and can be implemented by ordinary workers.
Description
technical field [0001] The invention belongs to the technical field of heat treatment of automobile parts, in particular to a method for removing an oxide film on the inner wall of a piston ring. Background technique [0002] The automobile piston ring is a key part in the automobile engine, and it is also a vulnerable part. Our country manufactures hundreds of millions of piston rings every year. At present, most of the piston ring manufacturers in my country use high-chromium martensitic stainless steel such as 6Cr13Mo and 9Cr18Mo for nitriding to manufacture piston rings. However, the nitriding of high-chromium martensitic stainless steel has always had a relatively big problem, that is, the distortion rate of high-chromium martensitic stainless steel nitriding treatment is relatively high. This distortion destroys the curved shape of the piston ring and changes its original shape. Some contact pressure distributions greatly reduce the sealing performance of piston rings...
Claims
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IPC IPC(8): B24C1/08
Inventor 杨斌
Owner 重庆广鼎道路设施有限公司