Quenching process of high-carbon chromium bearing

Abstract

The invention relates to a quenching process of a high-carbon chromium bearing. The quenching process comprises the following specific steps of S1, positioning a quenching furnace device; S2, preheating the high-carbon chromium bearing; S3, heating the high-carbon chromium bearing; S4, cooling and quenching; and S5, cleaning and tempering. The quenching process has the following advantages that preheating is conducted firstly, then uniform heating is conducted, the deformation degree is reduced while the hardness of the high-carbon-chromium bearing is guaranteed, oil flowing in a quenching oiltank is accelerated through the arrangement of a circulating conveying assembly, the uniformity of the oil temperature in all directions in the quenching oil tank is achieved, deformation of the high-carbon-chromium bearing is reduced, meanwhile, direct impact with a baffle on a conveying mesh belt is avoided, the hardness of the high-carbon chromium bearing is guaranteed, and the high-carbon chromium bearing is overturned up and down multiple times through the circulating conveying assembly, so that the quenching cooling uniformity is further improved, and the deformation degree is reduced.

Description

Technical field: [0001] The invention relates to the field of heat treatment of high-carbon chromium bearings, in particular to a quenching process for high-carbon chromium bearings. Background technique: [0002] The heat treatment of high-carbon chromium bearing parts generally adopts the process of quenching and tempering. The ferrule of high-carbon chromium bearings is in a pearlite state before heat treatment, and is in austenite state when heated. After quenching and cooling, it is in a martensitic state. The quenching expansion of the ring is caused by the specific tolerance difference between the pearlite before quenching and the martensitic structure after quenching. The heat treatment deformation of high carbon chromium bearings is the focus of the bearing industry. [0003] At present, the reasons for the heat treatment deformation of high-carbon chromium bearings during quenching are as follows: 1. The high-carbon chromium bearings are heated from room temperatur...

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Problems solved by technology

[0003] At present, the reasons for heat treatment deformation of high-carbon chromium bearings during quenching are as follows: 1. High-carbon chromium bearings are heated from room temperature to high temperature suddenly. When high-carbon chromium bearings transform from pearlite to austenite, the surface and The heating rate of the heart tissue and the temperature uniform rate are inconsistent, so that there is a certain difference in the heating temperature between the surface of the high-carbon chromium bearing and the heart tissue, and after quenching, heat treatment defects are easily generated; 2. The bottom of the quenching oil tank The oil in the quenching oil tank is cooled by setting the agitator, and the oil flows upward from the bottom of the quenching oil tank when the agitator stirs, the temperature of the oil at the bottom of the quenching oil tank and around the agitator is low, and the temperature of the oil above the quenching oil tank High, the uniformity of the oil temperature in the quenching oil tank cannot be achieved, the high-carbon chromium bearing falls into the quenching oil in the vertical direction, the temperature difference between the upper and lower sides of the oil in the quenching oil tank is large, the cooling is uneven, and the quenching deformation is large; 3. High carbon chromium The ring of the bearing falls vertically into the quenching oil tank, and it is easy to collide with the rollers or baffles on the conveyor belt in the quenching oil tank, thereby affecting the hardness of the high-carbon chromium bearing and causing surface deformation

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