JPH0310404B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The technical content described in this specification regarding a rolling mill control method when changing the running strip thickness during rolling of a strip metal material by a tandem rolling mill is to This is where we propose the development results for smoothly controlling the circumferential speed of the roll. In the rolling process of strip metal materials, rolling was generally carried out by setting the distance between the rolls of each stand of a tandem rolling mill and the circumferential speed of the rolls for each coil. It is necessary to stop the rolling process, which reduces rolling efficiency (b) It requires a large number of people to perform the threading process (c) The roll unit consumption deteriorates due to roll flaws that occur during threading (b) The tip of the coil This results in poor board thickness and lower yields. In order to alleviate these disadvantages, a fully continuous tandem rolling method was developed in which each coil is joined and rolled in sequence. (Prior Art) In a fully continuous tandem rolling system, it is essential to change the thickness of a strip of metal material between runs while rolling it. Here, in Special Publication No. 58-17145, between the rolls
The set values of the previous schedule are expressed as S and the set values of the next schedule are expressed as S' as shown in Table 1, and the set values of the roll circumferential speed are similarly expressed as V and V' as shown in Table 2. It shows how to change to .

【table】

Claims (1)

[Scope of Claims] 1. During tandem rolling in which the plate thickness is changed while continuing rolling, the distance between the rolls and the rolls of the i-th stand when the plate thickness change point reaches the j-th stand in advance The amount of circumferential speed setting change is calculated separately for each stand, and the control parameter that changes in a ramp function from 0 to 1 as soon as the plate thickness change point reaches the j-th stand is calculated between the rolls of each stand. , for each roll circumferential speed, and multiplying the setting change amount when reaching the j-th stand by the control parameter, the roll distance of the i-th stand when the j-th stand is reached 〓 and the roll circumferential speed, and further calculate the command value for the i-th stand by adding it over all the stands, thereby controlling the roll distance and the roll circumferential speed. Rolling mill control method when changing plate thickness.