High-strength toughness differential mechanism universal joint pin machining process

A processing technology and differential technology, applied in the field of heat treatment, can solve the problems of the cross shaft being seized, the verticality of the cross shaft being difficult to correct, and the high heat treatment rejection rate.

Inactive Publication Date: 2003-11-19
重汽(济南)车桥有限公司
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  • Application Information

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Problems solved by technology

Usually, this product uses 20CrMnTi material and adopts carburizing, straightening, quenching, straightening, and oxidation processes. Due to the high carburizing temperature, the product is prone to heat treatment deformation, especially the verticality of the cross axis is not easy to correct, and the heat treatment rejection rate is relatively high. high
The cross shaft also bears large compressive stress and friction force on the working surface, so that the cross shaft is seized and broken

Method used

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  • High-strength toughness differential mechanism universal joint pin machining process
  • High-strength toughness differential mechanism universal joint pin machining process

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Embodiment Construction

[0014] Embodiment: As shown in the attached figure, the shaft diameter of the cross shaft of the differential gear is Ф24mm, the design requires that the depth of the seepage layer is 0.8-1.1mm, the depth of the hard layer is 0.4-0.7mm, and the hardness is HRC59-63. Adopt this method: ① First, clean the cross shaft of the differential gear to make the surface free from rust and dirt; put it into the quenching rack; In the exhaust stage, the kerosene intake is 180d / min, the nitrogen intake is 0.3m / h, the furnace temperature rises to 860°C, and the exhaust stage is 0.5h; enter the strong infiltration stage, the furnace pressure is 26mm water column, and the kerosene intake The flow rate is 130d / min, the intake of ammonia gas is 0.13m / h, the furnace temperature is kept at 860°C, and the infiltration stage is 6.5h, so that the infiltration layer meets the process requirements; ③Cool with 20# engine oil to make the workpiece not easily deformed and Cracking; ④ Tempering, the temper...

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Abstract

A technology for preparing the high-strength and-toughness cross axle of differential gear includes such steps as washing to remove rust and dirt, osmosizing carbon and nitrogen (including ammonia gas and osmosizing), cooling in oil, tempering, fine grinding, treating with Mn and P, electrostatic spraying, and solidifying at 150-180 deg.C. The advantages of its product are high antiwear and anticorrosion nature, no deformation and cracking, high load-bearing power, and high rate of finished products.

Description

(1) Technical field [0001] The invention relates to a processing technology for a cross shaft of a differential gear of an automobile, and belongs to the technical field of heat treatment. (2) Background technology [0002] At present, the cross shafts of automobile differentials are carburized, straightened, quenched, straightened, and oxidized, and the surface is not coated. However, due to the characteristics of the application of the two-stage reduction bridge: compact structure, small size, large impact load and alternating bending load during work, and the working surface also bears large compressive stress and friction, so it is required The differential cross shaft should have high bending strength and contact fatigue strength, the surface should have high hardness, wear resistance and seizure resistance, and the core should have sufficient strength and toughness. Usually, this product uses 20CrMnTi material and adopts carburizing, straightening, quenching, straight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00
Inventor 沈静春孙兆福苏家庆于安军马殿宝李从军胡雁
Owner 重汽(济南)车桥有限公司
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