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Method for improving wear resistance of ring slots of combined piston steel top of diesel engine

A technology of combined piston and piston top, which is applied in the direction of coating, metal material coating process, solid diffusion coating, etc., can solve the problems of large component deformation, failure to meet requirements, high cost process, etc., and achieve small component deformation and low cost. The effect of low and short processing time

Inactive Publication Date: 2011-02-09
DATONG ELECTRIC LOCOMOTIVE OF NCR
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, it is found through experiments that the laser quenching method has large deformation of components and cannot meet the requirements; while the method of surface spraying ceramics is costly and there is no mature process at present

Method used

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  • Method for improving wear resistance of ring slots of combined piston steel top of diesel engine
  • Method for improving wear resistance of ring slots of combined piston steel top of diesel engine
  • Method for improving wear resistance of ring slots of combined piston steel top of diesel engine

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Embodiment Construction

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0021] like figure 1 As shown, the method for improving the wear resistance of the diesel engine combined piston steel top ring groove of the present invention includes the following steps: die forging the piston top, rough machining the dimensions of each part of the piston crown, semi-finishing the dimensions of each part of the piston crown, and processing the oil return hole , Finishing the size of each part of the piston top, quenching and tempering the piston top, processing the internal control size of the ring groove on the piston top, performing ion nitriding treatment on the piston top, and polishing the piston top.

[0022] Firstly, the blank of the piston top is made by the die forging process, and then the various s...

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Abstract

The invention discloses a method for improving the wear resistance of ring slots of a combined piston steel top of a diesel engine. The method comprises the following steps of: providing an accurately machined piston top; tempering the piston top; machining the internal control size of the ring slots of the tempered piston top; and performing ion nitriding treatment on the piston top. Through ring slot internal control size machining and ion nitriding treatment, the ion nitriding treatment hardness of three ring slots of the piston steel top is HRC45 to HRC54; the hardness and the wear resistance of the ring slots of the combined piston steel top are improved; the service life of the combined piston is improved; section repairing rule is met; and the requirement of no failure within 300,000 kilometers required by users is met.

Description

technical field [0001] The invention relates to a 240 or 275 type diesel engine steel top aluminum skirt combined piston, in particular to a method for improving the wear resistance of the diesel engine combined piston steel top ring groove. Background technique [0002] The piston used in existing 240 or 275 type diesel engines is a steel top aluminum skirt combination piston, wherein the steel top 1 is in the shape of a cover (such as image 3 shown) and fixed on the upper end of the aluminum skirt (not shown). The central part of the upper surface of the steel roof is an arc-shaped protrusion 11, and a concave arc-shaped annular groove 13 is formed between the arc-shaped protrusion 11 and the periphery 12 of the steel roof, and the annular groove 13 constitutes the W combustion of the steel roof. chamber; the central part of the lower surface of the steel roof forms an upwardly concave vault space 14, and a ring wall 15 is formed downward on the peripheral edge 12 of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/36C21D1/25B23P15/10C23F17/00
Inventor 张德忠赵春香
Owner DATONG ELECTRIC LOCOMOTIVE OF NCR