Control method for roller-type quenching process of large-single-weight large-section super-thick steel plate

Abstract

The invention provides a control method for a roller-type quenching process of a large-single-weight large-section super-thick steel plate. According to the control method, a specific heat model, a heat conduction coefficient model, a temperature field model and a correction model are involved. An implementation process of the control method comprises the following steps: inputting various parameters such as steel plate parameters, technological regulations and actually measured parameters at first, wherein the steel plate parameters comprise the thickness, the length and the carbon content, the technological regulations comprise the roller bed speed, the acceleration and the like, and the actually measured parameters comprise the tapping temperature, the temperature after air cooling, thetemperature after self-tempering and the like; calculating temperature fields in an air cooling section, a water cooling section and a self-tempering temperature section in sequence by utilizing thetemperature field mode as well as by invoking the specific heat model and the heat conduction coefficient model; correcting the temperature fields through the correction model; and acquiring a simulation result, that is, acquiring a group of cooling curves and cooling rate curves at different thicknesses. The control method has the advantages of being combined with the actual production situationso as to acquire the actual cooling curves and cooling rate curves; part of an actual debugging process can be substituted with model calculation; the control method can be utilized for guiding the adjustment of the technological regulations; the production cost can be reduced; and besides, a product in a good plate shape can be acquired.

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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