Vertical slab quenching machine and quenching method

Abstract

The invention relates to a vertical-type plate blank quenching machine and a quenching method. The vertical-type plate blank quenching machine is arranged above a quenching medium pool body, and comprises an overturning rack, an overturning rack base, a moving trolley and a vertical guide rail arranged in the pool body; the overturning rack base can be overturned and switched between the horizontal direction and the vertical direction; the overturning rack is arranged on the overturning rack base; a translation guide rail is arranged on the overturning rack; when the overturning rack base is at a vertical state, the translation guide rail can be in butt joint with the vertical guide rail; the moving trolley is arranged on the overturning rack; at the state that the overturning rack base is vertical, and the translation guide rail is in butt joint with the vertical guide rail, the moving trolley can slide to the vertical guide rail and slide downwards into the pool body; and a water supplement and gas supplying device is arranged in the pool body. By adopting the vertical-type plate blank quenching machine, a steel plate can be conveniently, rapidly and vertically dipped into a quenching medium, so that the problem that after a large-size plate blank is horizontally dipped into the quenching medium or is dipped into the quenching medium with an inclination angle, a steam film on the lower surface of the plate blank cannot be discharged out smoothly, so that difference between the cooling strength of an upper plate surface and the cooling strength of the lower plate surface is high is solved.

Description

technical field [0001] The invention relates to the technical field of quenching equipment for heat treatment of steel plates, in particular to a vertical slab quenching machine that vertically enters a quenching medium and a corresponding quenching method. Background technique [0002] Quenching of thick steel plates is mainly used for large steel structures, buildings, bridges, hydraulic engineering, offshore engineering, pressure vessels and commercial vehicles. [0003] With the rapid development of the domestic machinery manufacturing industry, the quenching of extra-thick steel plates has become an important guarantee for high-quality thick-spec semi-finished raw materials for large-scale container production, large-scale rack steel and tool and die steel processing and manufacturing. [0004] Due to the large size, thick thickness and wide surface of extra-thick steel plates, the quenching problem has become a difficult problem in the heat treatment industry for many ...

AI Technical Summary

Problems solved by technology

There are two ways to enter the liquid for immersion quenching of steel plates. One is to immerse and quench in a horizontal manner between the upper and lower plates of the steel plate and the liquid surface of the quenching medium. In this way, the thickness of the steam film generated on the lower plate is greater than that of the upper plate. As a result, the cooling intensity of the upper plate surface is significantly greater than that of the lower plate surface, resulting in a significant increase in the distortion of the steel plate after quenching and unstable microstructure and properties.

The other is that the upper and lower plates of the steel plate are perpendicular to the liquid surface of the quenching medium for immersion quenching and cooling. This method reduces the cooling difference between the upper and lower plates, and the distortion after quenching is relatively small and the microstructure is more stable. , but this quenching method needs to turn the horizontally heated steel plate by 90° before quenching. It needs to be equipped with a large special turning mechanism, which has requirements for the height of the factory building; The water entry time difference from the post-immersion side is relatively large, which will also cause inconsistency in the quality of the steel plate in the width direction. Therefore, considering the water entry time of the steel plate and eliminating the time difference between the beginning of the steel plate entering the water and the full immersion also need to be considered

[0006] Quenching and tempering of extra-thick steel plates, the patent of authorized notification number CN202047095U discloses a thick steel plate quenching device, which can be used for quenching steel plates with a maximum specification of 250*3800*9000mm (thickness*width*length), and the specification range is narrow and cannot meet the requirements Market Quenching Requirements for Larger Size Steel Plates

Moreover, in practice, it is found that the method of tilting the steel plate into the quenching medium will cause uneven structure of the steel plate after quenching and tempering, poor quality stability, low success rate and high initial investment cost of equipment.

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