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Technological method for raising toughness and hardening layer depth of heavy truck axle shaft

A technology of hardened layer depth and heavy-duty vehicles, which is applied in the field of heat treatment, can solve the problems of not being able to guarantee the use of half shafts, fracture of shaft diameter fillets, and affecting the quality of the whole vehicle, and achieve the effects of increased deformation, stable performance, and easy operation

Inactive Publication Date: 2003-08-06
重汽(济南)车桥有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The half shaft is a key part in the automobile assembly. It not only has the function of transmitting large torque, but also plays the role of protection when the torque is overloaded, so as to ensure that other parts will not fail when overloaded; and the half shaft The mechanical properties of the shaft are mainly determined by the quality of heat treatment, but at present, the heat treatment process cannot guarantee the use requirements of the half shaft, and often breaks at the rounded corner of the shaft diameter when the torque is not strong, seriously affecting the quality of the vehicle

Method used

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  • Technological method for raising toughness and hardening layer depth of heavy truck axle shaft
  • Technological method for raising toughness and hardening layer depth of heavy truck axle shaft
  • Technological method for raising toughness and hardening layer depth of heavy truck axle shaft

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Embodiment 1

[0016] Embodiment 1: The steps are as follows: firstly, the material is blanked, and the material of the half shaft 1 is 42CrMo; forging is carried out on a flat forging machine; the blank is subjected to quenching and tempering treatment on a heat treatment production line, and its process parameters: quenching temperature is 880 ° C, heating time For 160 minutes, the quenching medium is diesel oil, the tempering temperature is 610°C, the heating time is 180 minutes, and then water cooling; CNC machine tools are used for machining, the diameter of the semi-axis is φ58mm; medium frequency induction quenching, using 2500HZ, 100KW quenching machine tools, its Process parameters: power supply output power is 68KW, frequency is 1700HZ, workpiece moving speed is 2.1mm / s, quenching temperature is 890°C, cooling with 10% Jinyu quenching fluid, and then heating the disk surface statically for 12s, delay spraying water The time is 2s; when the semi-shaft is quenched in the induction coi...

Embodiment 2

[0017] Embodiment 2: The method steps are the same as in Embodiment 1, except that the quenching and tempering process parameters are that the quenching temperature is 850° C., the heating time is 140 minutes, the quenching medium is diesel oil, the tempering temperature is 560° C., and the heating time is 180 minutes. Minutes, then water cooling; medium frequency induction hardening, use 2500HZ, 100KW quenching machine tool, its process parameters: power output power is 66KW, frequency is 1680HZ, workpiece moving speed is 1.9mm / s, quenching temperature is 890°C, using 12% Jinyu The quenching liquid is cooled, and then the plate surface is statically heated for 15s, and the delayed water spraying time is 2s; when the half shaft is quenched in the induction coil, the surface gap between the induction coil and the half shaft rod is 7mm, and the lower plane of the induction coil and the The gap in the vertical direction of the blue plate plane is 5mm. After processing and testing...

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Abstract

The process for raising strong toughness and hardened layer depth of axle shaft of heavy lorry belongs to the field of heat treatment technology, and includes the following steps: blanking, forging; blank thermal refining, hardening temp. is at 850-890 deg.C, heating time is 140-160 min., hardening agent is diesel oil, tempering temperature is at 560-620 deg.C, heating time is 180 min.; cooling; machining; mild-frequency induction quenching, quenching temperature 870-900 deg.C, hardening liquid is 8-13% Jinyu hardening liquid, power supply output power is 65-70 KW, frequency is 1650-1700 Hz,work piece moving speed 1.8-2.1 mm / s, static heating time is 8-15s, delayed water-spraying time is 2s, gap between induction coil and axle shaft rod surface is 5-8 mm gap between induction coil undersurface and vertical direction of flange surface is 4-5 mm.

Description

(1) Technical field [0001] The invention belongs to the technical field of heat treatment, in particular to a process method for improving the strength and toughness and the depth of hardened layer of a half shaft of a heavy-duty vehicle. (2) Background technology [0002] With the increase in the use of heavy-duty vehicles, the requirements for axle shafts that transmit high torque are getting higher and higher. The half shaft is a key part in the automobile assembly. It not only has the function of transmitting large torque, but also plays the role of protection when the torque is overloaded, so as to ensure that other parts will not fail when overloaded; and the half shaft The mechanical properties of the shaft are mainly determined by the quality of heat treatment, but at present, the heat treatment process cannot guarantee the use requirements of the half shaft, and often breaks at the rounded corner of the shaft diameter when the torque is not strong, seriously affecti...

Claims

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Application Information

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IPC IPC(8): B21K1/06B60B35/14C21D1/06C21D9/28H05B6/10
CPCY02P10/25
Inventor 鲁统轮沈静春孙兆福杨嘉华李文英张彦于长建李长顺徐忠良程希峰李从军王世方
Owner 重汽(济南)车桥有限公司
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