Quenching process and equipment used in hollow variable-section shaft heads for vehicles

Abstract

The invention provides a novel quenching technology applied to a vehicular hollow variable cross-section spindle nose, which adopts a technical process of charging, induction heating, spray cooling, blanking, quenching hardness detection, tempering, cooling, hardness detection and mechanical property analysis. Equipment used by the quenching technology is characterized in that a turntable is arranged on a machine tool station, a locating disc is arranged on the turntable, a workpiece is placed on the locating disc, an induction coil is arranged at the periphery of the workpiece, water spray plates with a plurality of water inlet pipes are arranged at the periphery of the induction coil, and an upper centre having a clamp action is arranged at the upper part of the workpiece. The technology is energy-saving, efficient, environment-friendly and easy to control, easily achieves automatic heat treatment, can allow the vehicular spindle nose to obtain good comprehensive mechanical properties after heat treatment and ensures that products of all batches and all workpieces can keep relatively high consistency.

Description

technical field [0001] The invention relates to a metal material heat treatment process, in particular to a quenching process applied to a vehicle-used hollow variable-section shaft head and equipment used therefor. Background technique [0002] The axle head of the vehicle is generally a metal stepped axle, which has a solid, hollow variable section and semi-hollow variable section structure. It is located at both ends of the axle to support the rotating workpiece and rotate with it to transmit motion, torque or bending moment. Typical security parts on automobiles affected by fatigue force are subjected to random loads caused by drastic changes in road conditions during driving, and their performance directly affects driving safety and reliability. Therefore, products are required to have higher strength and durability. Abrasive. [0003] The vehicle shaft head is usually made of alloy structural steel. The basic conditions that need to be met are: quenched and tempered h...

AI Technical Summary

Problems solved by technology

[0004] 1. There is a certain period of time between the workpiece coming out of the furnace and entering the cooling tank. The shape of the workpiece causes the local temperature to drop below the Ar3 critical point, and a complete quenching structure cannot be obtained;

[0005] 2. The amount of workpiece loaded in the furnace and the placement of the workpiece in the furnace will cause uneven heating, resulting in uneven hardness;

[0006] 3. When entering the water, the workpiece is too close in the material basket, which hinders the rupture of the nearby steam film, resulting in low hardness of the adjacent surface of the workpiece;

[0007] 4. It is impossible to quench each furnace of red material in one go, and the decrease of furnace temperature will lead to inconsistent hardness of workpieces successively released from the furnace after quenching;

[0008] 5. If the coolant is used repeatedly, it is inevitable that there will be impurities such as oil and mud, and the temperature of the coolant will also rise, resulting in insufficient or uneven hardness;

[0009] 6. Long heating and holding time, severe oxidation and decarburization, coarse grains, affect quenching quality, and cause energy waste, low production efficiency, and high manufacturing cost

[0010] Due to the inaccuracy and randomness of human control factors, the above problems inevitably appear in the actual heat treatment production process, resulting in low product reliability and fatigue life, and it is difficult to meet the driving requirements of cars that have been driving at high speed on the road for a long time security, and it is not suitable for the social status quo with the increasingly serious energy crisis

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