A method for induction heat treatment of a low-speed high-torque drive axle

Abstract

The invention discloses an inductive heat treatment method of a low-speed large-torque drive axle and relates to the technical field of inductive heat treatment. The method comprises the specific steps as follows: an annular inductor and a quenching liquid spraying device are installed; a transformer ratio and the capacitance are determined; a run program is formulated according to specific technical requirements for a part; the part is clamped; a zero position and the rotational speed of the part are determined; an electrical parameter is adjusted and determined in coordination with the run program; an automatic run button is started, and the inductive heat treatment is performed on the part with a two-step method, that is, the first step is preheating, continuous heating is only performed in the annular inductor when the whole part is displaced from the head end to the tail end up and down, and the second step is to perform liquid spray cooling on the part to realize quenching of the part and the like while the part is heated in a manner identical with the first time. According to the inductive heat treatment method, the requirement for inductive heat treatment of the drive axle simultaneously provided with four structural types, namely, a rack, a keyway, steps and a spline is met; and the method in simple and reliable in operation, easy to implement, stable in quality and high in efficiency and has high application values.

Description

【Technical field】 [0001] The invention belongs to the technical field of induction heat treatment, and in particular relates to an induction heat treatment method for shaft parts, in particular to an induction heat treatment method for low-speed, high-torque drive axles. 【Background technique】 [0002] The low-speed, high-torque driving axle (material 42CrMo steel) is a key and safety component on a high-horsepower (above 160 horsepower) wheeled tractor. In order to meet the needs of the tractor for farming and transportation under different working conditions, the structural design of the driving axle is relatively complicated. , and the structural form cannot be changed arbitrarily, otherwise some functions will be lost, the usability of the tractor will be reduced, and in severe cases, the safety of the whole machine will even be affected. figure 1 It is a schematic diagram of the structure of the wheel shaft parts driven by low speed and high torque for high horsepower w...

AI Technical Summary

Problems solved by technology

The contact induction heat treatment method has achieved success on the shaft parts with racks, but the disadvantage is that this induction heat treatment method cannot realize the induction heat treatment of the drive shaft with four structural types of rack, keyway, multi-step and spline at the same time Requirements, can not achieve a deep hardened layer

But the disadvantage is that the segmented induction heat treatment method causes a quenching transition zone in the middle of each area of ​​the part. The induction hardening layer in this area is a weak link, that is, the induction hardening layer is discontinuous, and cannot be used for induction heat treatment of low-speed and high-torque drive axles.

But the disadvantage is that this induction heat treatment method requires a considerable power supply. It is reported that the power supply required for a torsion bar for a car with a length of 1298mm and a diameter of Φ29mm in the polished rod is 500kW, and a high-powered tractor with a length of 925mm and a diameter of Φ95mm is used. The power supply required to drive the axle at low speed and high torque will be greater, so this method is difficult to adopt in induction heat treatment of axles driven at low speed and high torque on high-horsepower tractors due to limited conditions

But the disadvantage is that this induction heat treatment method is only suitable for induction heat treatment of large variable diameter stepped shafts, and cannot meet the requirements of induction heat treatment for low-speed, high-torque drive axles with four structural types: rack, keyway, multi-step and spline. , and due to the skin effect principle of induction heat treatment, directly using this method will cause parts such as the root of the rack to fail to reach the quenching temperature, and the tip of the rack is overheated, and the expected purpose cannot be achieved

This technical solution mainly solves the strength of the arc surface of the flange and improves the performance of the half shaft, but the disadvantage is that if this induction heat treatment method is used to heat the rack, it will not be able to achieve uniform temperature on the tooth surface, resulting in quality ACCIDENT

But the disadvantages are: the one-time heat treatment method of the rectangular inductor needs a large power supply and the supporting facilities are complicated, and the cost is high, so it is not suitable for the induction heat treatment of the low-speed and high-torque drive axle of the high-horsepower wheeled tractor.

[0015] It can be seen from the above that none of the current methods can effectively and economically solve the requirements for induction heat treatment of large-sized drive axles with four structural types of racks, keyways, steps and splines. With the development of the machinery manufacturing industry, More and more of these parts

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