Control method for cold-rolled product size precision

Abstract

The invention relates to the field of cold rolling, in particular to a control method for the cold-rolled product size precision. The control method comprises the steps that regression analysis is conducted on relevant parameters of the raw material texture, an acid pickling and cold rolling technology of an acid pickling and cold rolling unit and a continuous annealing technology of a continuous annealing unit by adopting a five-stand six-roll UCM rolling mill, and a final reasonable regression equation and main influence factors are determined through multiple times of analysis and selection. According to the control method, the improving direction is provided for size precision control of various cold-rolled varieties, main points of new variety size precision control and size precision control of all unit products obtained after technology optimization are adjusted, and the good guiding significance is achieved. In addition, reference is provided for galvanized product size precision control according to analysis on the factors influencing the product size precision.

Description

technical field [0001] The invention relates to the field of cold rolling, in particular to a method for controlling the dimensional accuracy of cold rolling products. Background technique [0002] At present, the domestic application of cold-rolled sheets is mostly in the automobile industry and the home appliance industry, and the application in the automobile industry is mainly deep-drawing and above grades and high-strength steel. Higher requirements are placed on the surface, shape quality, performance and dimensional accuracy of steel. After the cold-rolled sheet is stamped and formed, the general thickness of the sheet will change. If the thickness thinning rate is too large, it will directly affect the strength and use of the stamping part; and if the deviation of the thickness accuracy of the steel plate is slightly large, it will easily affect the gap between the stamping die and the stamping part. As a result, it is easy to cause excessive tensile stress or compr...

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Problems solved by technology

[0003] In recent years, with the substantial increase in the variety, specifications and output of high-end automotive sheets and home appliance sheets, the number of user complaints and objections to product size accuracy has also increased significantly. Beijing Hyundai and other high-end users have been working with our factory since the beginning. The dimensional accuracy of the product was proposed as a standard; in addition, only in 2009, Beijing Hyundai, Brilliance and other users raised more than 1,200 tons of product dimensional accuracy objections and complaints, which seriously affected the use of users and caused greater cost loss

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