Continuous restraining quenching device for thin-walled square pipes

Abstract

A continuous restraining quenching device for thin-walled square pipes comprises a longitudinal restraining system, a transverse restraining system and a water spraying system. The longitudinal restraining system is composed of a longitudinal restraining roller set, a longitudinal hydraulic displacement device, a roller way transmission shaft, a transmission motor and a reduction gearbox. A servo control system controls a hydraulic cylinder to drive an upper longitudinal restraining roller to ascend and descend for implementing constant-position closed-loop control. The transverse restraining system is similar to the longitudinal restraining system in structure and working principle. The water spraying system is composed of large / small water spraying units and a transverse moving mechanism, and water mist nozzles are automatically switched according to the specification of a square pipe. The longitudinal / transverse restraining systems and the water spraying systems are alternately arranged to conduct continuous restraining quenching on a square pipe. According to the method, the problems of large deformation, poor quenching uniformity, low production efficiency and the like in the square tube quenching process are solved, flexible quenching according to the process path is realized, various cooling modes are beneficial to regulation and control of the structure performance of square pipes, and the mechanical property and the service performance of square pipes are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of steel heat treatment, and relates to a thin-walled square tube continuous restraint quenching device. Background technique [0002] Square pipe (referred to as square pipe) is a pipe with equal side lengths, usually made of strip steel after flattening, crimping, welding to form a round pipe, and then rolled into a square pipe. This kind of steel is widely used in mechanical chemical industry, automobile, marine engineering, structural manufacturing and other fields. For some special-purpose square tubes, due to high requirements on strength and toughness, harsh service environment, and strict requirements on mechanical properties such as material strength, toughness, plasticity, hardness, and corrosion resistance, they need to be quenched and heat treated, and different heating systems and cooling systems are used. Adjust the structure and shape of the steel to obtain more excellent performance. [000...

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Problems solved by technology

[0007] In view of the problems of poor quenching uniformity of existing high-strength thin-walled square tubes, poor controllability of the quenching process, serious material distortion after quenching, and low production efficiency, the purpose of the present invention is to provide a continuous restraint quenching device for thin-walled square tubes, which can meet the high uniformity requirements of such steel products. High-precision, high-precision, high-efficiency quenching heat treatment

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