Elongated gear shaft heat treatment deformation control process method

Abstract

The invention discloses an elongated gear shaft heat treatment deformation control process method. The method comprises the following steps that rough machining is carried out; stress-relieving and annealing treatment are carried out on a part after the rough machining; hobbing is carried out, the hobbing are carried out at the two ends of the part, and grinding allowance of the tooth surface is reserved; carburizing treatment is carried out, deformation direction and deformation quantity of the part are detected after carburization; pressurization, straightening and quenching treatments are carried out, according to the deformation direction and the deformation quantity of the part, a pressurizing position is selected, and a supporting part is correspondingly arranged; a pressurizing heavy object is placed at the upper end of the part corresponding to the pressurizing position; the part, the supporting part and the pressurizing heavy object are integrally hoisted into a quenching furnace for heat preservation, and then the quenching oil is wholly hoisted; and after quenching, low-temperature tempering and stress-relieving treatment are carried out. According to the technological process, a supporting point is arranged in the quenching process, pressurizing and quenching are carried out at the supporting point, so that deformation caused by quenching can be effectively reduced,the qualified rate is greatly improved, the rejection rate is remarkably reduced, and the problem that deformation control of the large-span herringbone-tooth long gear shaft is solved.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a process method for heat treatment deformation control of an elongated gear shaft. Background technique [0002] For the gear shafts used in large-scale heavy-duty construction machinery equipment such as fracturing pumps in the petroleum industry, on the one hand, in order to ensure reliability and high fatigue life, it is necessary to carry out carburizing and quenching treatment on the teeth of the gear shaft to improve the hardness of the tooth surface . On the other hand, because the length of the part is long, the diameter is small, and the aspect ratio (length / diameter) is above 10, the deformation tendency of the part is relatively large during the heat treatment process. Large, the gear modulus is small (modulus less than 8), and the depth of the carburized layer of the part is relatively shallow. If it is large, it will lead to a decrease in tooth surface hard...

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a process method for heat treatment deformation control of a slender gear shaft, which can effectively solve the problem of large amount of bending and torsional deformation during the heat treatment process of the slender gear shaft. The depth and hardness of the effective hardened layer on the tooth surface cannot be guaranteed, resulting in a high scrap rate of parts

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