A rapid prediction method for the grinding amount of back-up rolls in a hot-rolled strip mill

Abstract

The invention relates to a method for fast predicting the grinding quantity of a support roller of a hot rolled plate strip rolling mill, belongs to the technical field of a rolling roller maintenance process and is used for predicating the grinding quantity of the support roller during the roller maintenance by a calculation formula. The method has the technical scheme that a support roller grinding quantity predicating formula is adopted, the constants and the coefficients corresponding to a rolling roller material and a machine frame of the support roller to be ground are substituted into the support roller grinding quantity predicating formula, and the required grinding quantity of the support roller can be obtained. The method can overcome the defects of the grinding method adopted during the support roller maintenance in the prior art, the effect of fast and accurately predicting the reasonable grinding quantity of the support roller to be maintained is realized, the goals of high speed, accuracy and high efficiency in the maintenance process are achieved, after the method is adopted, the consumption quantity of the support roller is obviously changed and is averagely reduced by about 0.03 kg / t. The method has the advantages that the problem of restricting difficulty of the support roller maintenance is solved, the production of the rolling mill is ensured, the maintenance time and the cost are also greatly reduced, and the production cost is reduced.

Description

Technical field [0001] The invention relates to a method for determining the grinding amount of a support roll during the maintenance of a roll in a hot-rolled plate and strip rolling mill, and belongs to the technical field of roll maintenance technology. Background technique [0002] The four-high rolling mill of the hot strip rolling mill consists of two upper and lower working rolls and support rolls. Each support roller needs to be ground after service. The important purpose is to remove the work hardened layer on the support roller surface due to long-term rolling contact. However, how much the support roller needs to be ground is safe and economical. At present, the grinding methods of support rolls are roughly divided into the following two types: One is the hardness measurement method. This method refers to the comparative measurement of the qualified hardness of the roll products when they enter the factory, that is, after each support roll is ground a certain unit mil...

AI Technical Summary

Problems solved by technology

For the above two methods, the empirical grinding method requires long-term and rich on-site work experience and non-destructive testing skills for roll tools, and is relatively abstract and difficult to master.

Although the hardness measurement method is more scientific and intuitive than the former, but the process is complicated, so that the backup roller needs to be continuously repeated for 24 hours during grinding "grinding 1 mm → stop grinding → hardness testing → hardness exceeding the standard → increase grinding 1 mm" process until the hardness is qualified. Such a cycle often needs to be carried out 4 or 5 times during the processing of each support roll, and the grinding time exceeds 12 hours, which can easily affect the normal production of the rolling mill.

In addition, in the past, the qualified standard for the hardness of the back-up roll was "the hardness of the roll surface after the back-up roll is ground should be close to or not higher than its incoming hardness within 3HSD". However, this standard is too conservative, causing unnecessary waste of rolls

[0003] In addition to the above two methods, so far there is no better method to determine the amount of back-up roll grinding, making back-up roll grinding a long-standing problem that restricts back-up roll maintenance, which has not been resolved for a long time, not only greatly affecting the production of the rolling mill, but also Increase the maintenance time and cost, and increase the production cost. Therefore, it is necessary to develop a fast prediction method for the grinding amount of the support roll to quickly and effectively grind the support roll to ensure the smooth progress of production