Marine flat-bulb steel squirrel-cage type induction heating device and marine flat-bulb steel squirrel-cage type induction heating process

Abstract

The invention relates to a marine flat-bulb steel squirrel-cage type induction heating device and a marine flat-bulb steel squirrel-cage type induction heating process and belongs to the technical field of metallurgical thermal treatment processes. Continuous quenching is achieved by way of preheating and heating the marine flat-bulb steel by using copy coils of a preheating coil group and a heating coil group as the marine flat-bulb steel is driven by a roller conveyor belt to move at a uniform speed. A reasonable temperature distribution is obtained on the surface of a workpiece by means ofheat conduction, and an ideal heating effect is obtained by way of secondary heating. The surface temperature of the preheated marine flat-bulb steel is detected in real time through an infrared temperature measuring camera and the copy coils are matched with different shape parameters of the marine flat-bulb steel on line in the heating process, so that a phenomenon of an excessive local temperature difference caused by a sharp corner effect is reduced and the performance of the marine flat-bulb steel after induction heating quenching and the uniformity of a hardening layer are improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical heat treatment technology, and relates to the quenching treatment of flat bulb steel for ships, in particular to a squirrel-cage induction heating device and process for flat bulb steel for ships. Background technique [0002] Bulb flat steel for ships is an auxiliary medium section for shipbuilding. Generally, when designing larger ships and regular ships, the main hull is usually made of bulb flat steel with the same thickness and material as the connected plates, which can improve the carrying capacity and safe navigation of the ship. . In recent years, with the development of the shipbuilding industry in the direction of high speed, large scale and automation, the demand for high strength, high toughness and large specification of marine bulb flat steel has been put forward. [0003] In actual production, most of the flat bulbs for ships are heated and quenched in a heating furnace at p...

AI Technical Summary

Problems solved by technology

When the traditional profiling coil is used to heat the marine bulb flat steel, due to the influence of the sharp corner effect, the temperature rises faster at the rounded corner of the ball end and the rounded corner between the top surface of the ball and the web, and it is easy to produce a large temperature difference after heating , resulting in increased internal stress, seriously affecting the performance of the bulb flat steel after induction heating and quenching and the uniformity of the hardened layer

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