Periodical stepped quenching cooling equipment

Abstract

The present invention relates to heat treatment of metal material. The periodical stepped quenching cooling equipment of the present invention includes tank, U-shaped fluid guiding tube, propeller stirrer set beside the tank and with propeller extending below the liquid surface, elevating platform and this driving system, cover plate, one nozzle below the cover plate and one other nozzle over the liquid surface. The propeller is inserted into one opening of the fluid guiding tube and the other opening of the fluid guiding tube is set below the soaked quenched part. The present invention makes it possible to regulate the cooling strength of the quenching based on the requirement, has low quenching cost, no pollution of nitrate and oil to atmosphere and high production safety.

Description

technical field [0001] The invention relates to a graded quenching cooling device, in particular to a periodic graded quenching cooling device, which belongs to the field of heat treatment of metal materials. Background technique [0002] Quenching refers to heating the steel part to A C3 or A C1 It is a heat treatment process in which a certain temperature above the temperature is maintained for a certain period of time, and then cooled at an appropriate rate to obtain martensite and (or) bainite structure. In order to obtain the desired organization and performance, many conventional, special and combined cooling methods and equipment are used. Martensite quenching is one of the methods. Martensitic graded quenching mostly uses nitrate or graded quenching oil as the quenching medium, which has the advantage of reducing the structural stress caused by phase transformation, reducing the tendency of distortion and cracking, and obtaining the expected structure and performa...

AI Technical Summary

Problems solved by technology

The difference between the ITQS system and the traditional real-time quenching (Time quenching) equipment is that the time and order of changing the stirring speed of the former are theoretically calculated and verified by experiments, and then controlled by a computer to reproduce it in actual production; while the latter uses is a trial-and-error approach, the success of which is determined by the operator and is often difficult to reproduce

Although the time-controlled immersion quenching system (ITQS) has a certain effect in reducing the distortion of the workpiece, when the temperature of the workpiece is close to the Ms point, it only reduces the cooling intensity of the medium by reducing the stirring rate of the medium, and cannot be classified as martensite. It is kept isothermally at a temperature close to the Ms point like quenching, so as to minimize the structural stress caused by phase transformation, reduce the tendency of distortion and cracking, and obtain the expected structure and performance goals

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