A control method for the roller quenching process of large single weight and large section extra thick steel plate

Abstract

A control method for a roller quenching process of a heavy-piece weight and large-section ultra-heavy plate has a specific heat model, heat transfer coefficient model, temperature field model and correction model. Plate parameters inputted include thickness, length and carbon content, technological procedure, roller speed and acceleration. Measured parameters include tapping temperature, temperature after air cooling and temperature after self-tempering. The temperature field model is used. Specific heat model and the heat transfer coefficient model are invoked for calculating an air cooling stage, water cooling stage and self-tempering stage in sequence. Temperature fields are corrected through the correction model. Simulated results include a group of cooling curves and cooling speed curves at different thicknesses. Practical temperature drop curves and cooling speed curves are obtained in combination with actual production and part of actual debugging process is replaced by model calculation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for controlling a steel plate roller quenching process. Background technique [0002] The temperature field distribution of the extra-thick steel plate after quenching will affect the physical properties and machining performance of the steel plate to a large extent. In the traditional immersion quenching, the steel plate is immersed in the quenching pool or quenching tank, limited by the volume of the container, the cooling rate is slow and the distribution is uneven. Roller quenching, the steel plate enters the quenching machine through the rotating roller table, and the high-pressure jet is sprayed on the surface of the steel plate. Compared with the traditional quenching method, the cooling speed is greatly increased, and the steel plate can be cooled to room temperature in a short time. However, due to the large thickness of the steel plate and the slow heat transf...

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Problems solved by technology

The patent CN102507636A discloses a method for measuring the interface heat transfer coefficient in the rapid cooling process of steel. By connecting the thermocouple spot welding to the temperature acquisition module, the surface temperature change data is obtained, and the interface heat transfer coefficient in the cooling process is obtained by using heat treatment software. , and then simulate the temperature change of the workpiece cooling process, and compare with the measured results until the change trend is in good agreement; none of the prior art involves the control method related to the roller quenching process of large single weight and large cross-section extra-thick steel plates , not to mention the specific method of correcting the heat transfer coefficient in the roll quenching process of large single weight and large cross-section extra-thick steel plates by using the corrected model

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