A Method of On-line Measuring Slab Width

Abstract

The invention provides a method for measuring the width of a plate blank online. The method comprises a pressure-width detection method, a displacement-width detection method and a plate blank width overproof judgment method. The width of the plate blank is measured online through the pressure-width detection method or the displacement-width detection method, and the measurement result is judged through the plate blank width overproof judgment method. The method is used for measuring the width of the plate blank before processing by a fixed-width press and aims to reduce the width blocking rate caused by the narrow width of the plate blank; accidents caused by the ultra-large width of the plate blank during rolling of the fixed-width press (SP) and an E1 vertical roller mill are avoided; and quality accidents caused by error feeding due to the difference of the width sizes are avoided.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for measuring the width of a slab online. Background technique [0002] At present, the steel strip produced by Angang 1580 line will produce narrow-gauge or fixed-width presses (SP) during rough rolling, and the reduction of E1 vertical rolls will be too large and overloaded to trip, which will seriously cause accidents such as breakage of the vertical roll spindle , It will cause width blockage in terms of quality, and equipment failure in production, which will directly affect production seriously. After on-site tracking and analysis, the cause of the accident was mainly due to the large difference between the width of the raw material and the nominal width, that is, the width of the raw material was too wide or narrow. One is that during equal-width rolling (raw material width-finished product width ≤ 50mm), the fixed-width press (SP) is automatically set to e...

AI Technical Summary

Problems solved by technology

One is that during equal-width rolling (raw material width-finished product width ≤ 50mm), the fixed-width press (SP) is automatically set to empty. If the raw material width is too wide or the narrow ruler of the raw material exceeds a certain range, the narrow It caused quality defects such as narrow rulers of finished products and narrow rulers at the head and tail, which increased the amount of quality blockade. In 2016, the rate of quality blockage due to the unsuitable slab size was 0.25%, which increased the processing amount of packaging defects and affected the delivery cycle. Affect the finished product rate and rolling cost; if the raw material is too wide, the load of the E1 vertical roll will exceed the limit, the head will be squeezed, and the E1 vertical roll will trip. In serious cases, the E1 spindle will be broken, resulting in the shutdown of the rolling line, which will seriously affect the production; The second is that during normal production (SP is not empty), the over-width of the raw material will cause the width reduction of the SP fixed-width press to exceed the limit, and the load of the fixed-width press (SP) will exceed the limit, resulting in a trip, and the joint shaft will be broken, etc. Accidents, the narrow gauge of the raw material will cause the finished product to be narrow, which will increase the quality blockade, increase the amount of packaging defect processing, affect the delivery cycle, affect the yield and rolling cost; the third is caused by the wrong material due to the difference in width and size The mixed steel can not be identified by the steel loader on the width, and can only be judged according to the slab number. If the slab number is wrongly sprayed or traced, the wrong material will be loaded, and the hot rolling is normally rolled after being released from the furnace, and inspected after coiling Performance or in the hands of customers will find mixed steel, which will cause major quality accidents, not only prone to accidents during production, increasing rolling costs, but also affecting the company's reputation in the market

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