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Processing method of steel piston gas ring

A piston gas ring and processing method technology, applied in the field of piston ring processing, to achieve the effect of saving process manufacturing costs, low overall yield, and solving the effect of machining process

Active Publication Date: 2011-09-07
NANJING FAYN PISTON RING
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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to overcome the deficiencies of the prior art and provide a processing method for a steel piston air ring, which calculates the pressure distribution profiles required by different ellipticities and fully considers the effects of nitriding shrinkage. The change of the molded line improves the size of the shaped tire rod, thereby greatly reducing the deformation of the air ring after nitriding and other procedures, and improving the yield of the product

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  • Processing method of steel piston gas ring
  • Processing method of steel piston gas ring
  • Processing method of steel piston gas ring

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Embodiment Construction

[0031] Take the single-cylinder diesel engine steel piston ring group as an example to further the present invention. The diesel engine steel piston ring set adopts the following combination: steel barrel ring (chrome-plated or nitrided) + steel cone ring (nitrided) + steel belt combined oil ring (chrome-plated or nitrided).

[0032] The selection of the surface treatment of the air ring must ensure long-lasting wear resistance, so the surface treatment layer must be thick and high in hardness, and it must be able to achieve or even exceed the effect of chrome plating. Nitriding treatment is used, and the nitriding performance is selected according to the characteristics of the nitriding process. 6Cr13Mo steel as the base material. Oil ring lining spring material is SUS304, coloring treatment, scraper ring is SWRH72A (NHC-54), hard chrome plated. Since the steel becomes brittle after nitriding, after nitriding the wiper ring reaches the thickness of the chromium layer, the fl...

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Abstract

The invention discloses a processing method of a steel piston gas ring, which comprises the following steps: winding-destressing-grooving-shaping-top line trimming-flat surface grinding-excircle boning-chroming or nitriding-top line trimming-excircle boning-top line trimming-flat surface grinding; the size of a shaped blank rod is improved by calculating pressure distribution mold lines with different ovality requirements and fully considering the mold line change caused by nitriding shrinkage, thereby the problem of gas ring deformation after procedures, such as nitridation, and the like is greatly reduced, and the finished product ratio of the product is improved. Compared with the defects of long process routes, multi-workshop crossing processing and low comprehensive finished product ratio in the casting iron gas ring, the comprehensive finished product ratio of the steel gas ring processed by using the shaped blank rod can reach up to 95 percent. By utilizing the pliability characteristic of the steel and adopting a shaped steel winding and shaping process, the invention solves the fussy machining process of cast iron material, shortens the manufacturing period, also reduces the procedure waste simultaneously and saves the process manufacturing cost.

Description

technical field [0001] The invention relates to a processing method for a piston ring, in particular to a processing method for processing a steel piston air ring for a single-cylinder diesel engine by using a pressure profile. Background technique [0002] At present, the piston rings of single-cylinder diesel engines are all made of cast iron, and the design of the piston ring group generally adopts the combination of "chrome-plated gas ring + phosphating gas ring + integral oil ring or inner spring oil ring". Although the cast iron ring improves the self-lubricating ability in the working process by virtue of its unique graphite structure, it has the following defects: ① Due to the limitation of the material strength, in order to ensure that it will not break during the working and manufacturing process, the size of the piston ring is relatively small. Large, resulting in heavy mass of the entire ring group, large inertial force during work, poor dynamic stability of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/06
Inventor 黄代凤艾国李丽
Owner NANJING FAYN PISTON RING
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