Method for thermally adjusting width of crystallizer and crystalline wedge-shaped blank of crystallizer

Abstract

The invention discloses a method for thermally adjusting width of a crystallizer. The method comprises the following steps of: 1) positioning the narrow side of the crystallizer at an initial position; 2) performing uniformly accelerated curvilinear motion on the top end of the narrow side of the crystallizer relative to a casting blank, and after the top end reaches a preset middle position, performing uniformly retarded curvilinear motion on the top end of the narrow side of the crystallizer; 3) after the bottom end of the narrow side of the crystallizer moves for a certain time at the top end, performing motion according to the track of the top end of the narrow side in the step 2); and 4) after the top end and the bottom end of the narrow side of the crystallizer reach the target set positions, finishing a width-adjusting process. Online width quick adjustment on the crystallizer can be realized under the condition of a full pulling speed, and the metal yield and the production operation rate are improved. The invention also discloses a crystalline wedge-shaped blank. Envelope lines on the two sides of the crystalline wedge-shaped blank are symmetrical mutually. Each envelope line comprises two sections of externally tangent arc lines, wherein the radians of the arc lines are alpha-0 and 0-alpha respectively, and circle centers are respectively positioned on the left side and the right side of the envelope line. Due to the shape of the envelope lines of the crystalline wedge-shaped blank, a casting blank shell can be stably and continuously supported in a width-adjusting process, a steel-leaking accident is prevented, and a casting defect is overcome.

Description

technical field [0001] The invention relates to the field of metallurgical continuous casting, in particular to a method for thermally adjusting width by using a crystallizer and a crystallized wedge-shaped billet. Background technique [0002] The traditional mold width adjustment method must pull out the tail slab of the previous steel type and then re-adjust the width, and reopen the sliding nozzle of the tundish. Every time the slab section is changed, the production needs to be stopped for more than 2 hours. The technology of crystallizer thermal width adjustment can avoid replacing the crystallizer in the traditional way or adjusting the width of the crystallizer in an online cold state during shutdown, resulting in loss of production time and loss of raw materials for secondary casting, thereby improving metal yield and production rate, and improving Casting machine capacity, reducing production costs. Because of this flexible and continuous production mode, the crys...

AI Technical Summary

Problems solved by technology

Baoxin's CN101334672A discloses a method of circular "cone adjustment-amplitude modulation-cone adjustment". CN102240783A of China Metallurgical South discloses a method for on-line adjustment width reduction of a large-scale continuous casting mold. The widening process is extremely slow and the safety of widening is difficult to guarantee

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