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Thermal treatment process of rocker arm

A process, nitriding treatment technology, applied in the field of heat treatment of rocker arms of general gasoline engines, can solve the problems of high brittleness and poor wear resistance of rocker arms, achieve large changes in hardness gradient, reduce requirements, 100% safety and reliability Effect

Inactive Publication Date: 2018-06-12
QINGDAO XIAOMIXING ELECTRONICS TECH CO LTD
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AI Technical Summary

Problems solved by technology

After quenching, the brittleness of this part is extremely high, and fractures often occur here during use. For example, the carburized layer does not meet the requirements, and the wear resistance of the rocker arm is poor, resulting in early failure. Once the above defects appear, only the entire furnace is scrapped.

Method used

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Embodiment Construction

[0009] A rocker arm heat treatment process with stable quality, preventing brittle fracture of the rocker arm, lowering the requirements for carburizing equipment, and achieving a 100% product qualification rate. The technical scheme of the present invention includes placing the plate in an ordinary gas carburizing furnace after stamping, carburizing, quenching, high-temperature tempering, shot peening, and nitriding treatment, and dropping kerosene into the furnace after heating to 860-920°C to make the furnace The carbon potential is 0.8-1.1%, the pressure in the furnace is 15-20mm water column, and the temperature is kept for 60-150 minutes to make the carburized layer depth 0.3-0.7mm, and it is directly quenched out of the furnace and cooled in 2.5-7% sodium hydroxide aqueous solution. Then put the workpiece into a furnace at 480-600°C for tempering, keep it warm for 40-80 minutes, make the surface hardness of the workpiece HRC20-33, then clean it, put it in a preheating fu...

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Abstract

The invention discloses a thermal treatment process of a rocker arm, belongs to a thermal treatment process of a workpiece for general machinery, and aims to provide the thermal treatment process of the rocker arm workpiece which is stable in quality, prevents brittle fracture of the workpiece, reduces a requirement on carburizing equipment and has a product qualification ratio being up to 100 percent. The thermal treatment process of the rocker arm disclosed by the invention comprises technological processes including impact molding, carburizing, quenching, high-temperature tempering, preheating and nitriding thermal treatment of the rocker arm.

Description

technical field [0001] The invention belongs to a rocker arm heat treatment process for general machinery, in particular to a rocker arm heat treatment process for a general gasoline engine with a cylinder diameter within Φ100mm. Background technique [0002] In view of the common problems in the current heat treatment process, the heat treatment of metal parts with complex shapes, many stress concentration points, and frequent use cannot meet the requirements of use, and problems such as deformation stress often occur. For example, the heat treatment process used by the rocker arm includes stamping the raw material of 08 steel plate, carburizing, quenching, low temperature tempering, and polishing. This heat treatment process has high technical requirements on the carburizing furnace, and it is necessary to use a controllable atmosphere heat treatment carburizing furnace or a carburizing furnace with a microcomputer to control the carbon potential in the furnace; Extremely...

Claims

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Application Information

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IPC IPC(8): C23C8/50C23C8/22C21D1/18C21D9/00C23F17/00
CPCC23C8/50C21D1/18C21D9/0068C23C8/22C23F17/00
Inventor 曲立辉
Owner QINGDAO XIAOMIXING ELECTRONICS TECH CO LTD
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