Swinging arm heat treatment technology of general small gasoline engine
A gasoline engine and process technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of high brittleness and poor wear resistance of rocker arm, and achieve the effect of high wear resistance
Inactive Publication Date: 2005-04-20
张权芳
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Problems solved by technology
After quenching, the brittleness of this part is extremely high, and it will break during use. If the carburized layer does not meet the requirements, the wear resistance of the rocker arm is poor, resulting in early failure. Once the above defects appear, only the whole furnace will be scrapped.
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[0018] The tempering temperature in the heat treatment process of the rocker arm of the 168F gasoline engine is 620±10°C, and the temperature is kept for 30±10 minutes to make the surface hardness of the rocker arm HRC25±3. Minutes, after cleaning, put it in a preheating furnace to preheat to 330±10°C, keep it warm for 10 minutes, and then put it into a nitride salt bath with a cyanide content of 35-37% and a temperature of 560±5°C for 130 ±10 minutes, the depth of the ε-phase nitride layer on the surface of the rocker arm is 0.011mm, the hardness is HV460-500, and the depth of the total nitride layer is 0.25-0.35mm.
[0019] The heat treatment process of the rocker arm of the 182F gasoline engine is the same as that of the 168F gasoline engine.
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Abstract
The invention relates to a rocker arm treatment process of a general small gasoline engine, which relates to the rocker arm treatment process of a small gasoline engine, and is particularly applicable to the rocker arm treatment process of a general small gasoline engine whose cylinder diameter is within φ100mm. Solve the brittle fracture of the rocker arm and reduce the requirements for carburizing equipment. The invention includes stamping forming, carburizing, quenching, high temperature tempering, preheating and nitriding of the rocker arm. The invention can completely prevent the brittle fracture of the rocker arm and reduce the requirement on carburizing equipment. After the rocker arm is treated by the process, the qualified rate of the product reaches 100%.
Description
Technical field: [0001] The invention belongs to a rocker arm heat treatment process for a small gasoline engine, in particular to a rocker arm heat treatment process for a general small gasoline engine with a cylinder diameter within Φ100 mm. Background technique: [0002] At present, the heat treatment process adopted by the rocker arm includes stamping and forming the raw material of 08 steel plate, carburizing, quenching, low temperature tempering, and polishing. This heat treatment process has very strict technical requirements on the carburizing furnace, and it is necessary to use a controllable atmosphere heat treatment furnace or a carburizing furnace with a microcomputer to control the carbon potential in the furnace. The depth of the carbon layer is 0.3-0.5mm. When the carburized layer reaches the required upper limit, the rocker arm will be penetrated at the stretched place (generally, the thickness of the raw material of the rocker arm is 1.5-2mm, and it will be ...
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IPC IPC(8): C23C8/00C23C8/20C23C8/48
Inventor 张权芳
Owner 张权芳