JPH0360817A - Method for controlling stop position of tail end of strip in coiler - Google Patents

Abstract

PURPOSE:To prevent the damage of the tail end part of coil by estimating the diameter of coil when rolling, estimating the diameter of coiling coil, controlling predictively the number of revolution of mandrel until a coiler is stopped and controlling correctively the number of revolution of mandrel until the coiler is stopped. CONSTITUTION:Until the tail end of a strip 1 is passed through the final finishing stand 2, the diameter of coil when rolling is estimated with the speed of the strip 1 at that stand 2 and the number of revolution of the mandrel 5A of the coiler 5. After the tail end of the strip 1 is passed through the stand 2, the diameter of the coiling coil is estimated based on the number of revolution of the mandrel 5A. After the tail end of the strip 1 is passed a tail end detector 6 on the downstream of the stand 2, the number of revolution of the mandrel until the coiler is stopped is predictively controlled on the basis of the diameter of the coiling coil. The diameter of the coiling coil for predictive control is detected by the opening degree of a detector 11 for opening degree when blocker rolls 7, 8, 9 are brought into contact with the coil and, by use of that diameter of coil, the number of revolution of the mandrel 5A until the coiler 5 is stopped is correctively controlled with a control device. By the way, frequency of manual intervention by operator can be reduced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a method for controlling the stop position of a strip tail end of a winder used when winding a strip that has passed through a finishing stand with a winder equipped with a blocker roll. Regarding. [Prior art 1] Conventionally, methods for controlling the stop position of the strip tail end of a winder in hot rolling have been disclosed in Japanese Patent Application Laid-Open No. 51-20047, Japanese Patent Application Laid-Open No. 74213-1983, or the patent application disclosed by the present applicant. Techniques such as JP-A-58-107217 have been disclosed. JP-A No. 51-20047 discloses that since the length from the tail end detector installed downstream of the rolling mill to the winding machine is known, by counting the winding length with a presser roll, This is to control the tail end to stop at a desired position. In addition, Japanese Patent Application Laid-open No. 58-74213 detects the tail end of the winder that is actually wound on the winder using a wrapper roll (blocker roll), and detects the tail end from this and the rotation angle information of the mandrel of the winder. The end is stopped at the desired position. This wrapper roll is provided to assist the winding of the leading end of the strip, and is usually also used at the tail end of the strip to prevent the strip from flapping. When the tail end passes through the contact portion of the bugle roll, the bugle roll is subjected to a shock, so that the position of the tail end on the coil can be detected. JP-A-58-107217 discloses that the position of the tail end of the strip is detected by a tail end detector installed downstream of a finishing stand, and that the position of the tail end of the strip is detected from the tail end detector to a predetermined tail end stop position in the winder. Using the length, the winding coil diameter is determined from the plate thickness and space factor, and the winding machine's mandrel rotation speed is predictively controlled to stop the winding machine (the mandrel) at a predetermined tail end stop position. That is what it is. [Problem to be Solved by the Invention] However, in the above-mentioned Japanese Patent Application Laid-Open No. 51-20047, the error due to the change in 1'8 length due to the change in the roll diameter becomes large, and as a result, the error in the stopping position becomes large. There was a problem. Further, in Japanese Patent Application Laid-open No. 58-74213, there was a problem in that it was difficult to determine whether the tail end had passed due to vibrations during winding. In other words, in order to accurately detect the tail end of the winding machine, it is necessary to improve the followability and sensitivity to changes in the coil diameter of the wrapper roll. This poses a problem in that it is more susceptible to the effects of vibrations and the like, making it easier to make erroneous judgments. Furthermore, also,
Since the tail end is detected after the strip is completely wound on the winder, there is a problem in that the time required for the winder to stop is extended. On the other hand, although the method of JP-A-58-107217 provides relatively good results, this method still has the problem that an error in the coil diameter information induces an error in the stop position. That is, since the set plate thickness and set space factor were used as information for determining the coil diameter, there was a problem in that errors between calculated values and actual results were unavoidable.

Claims (1)

[Claims] (1) In the strip tail end stop position control method of the winder used when winding the strip that has passed through the finishing stand with a winder equipped with a blocker roll, until the tail end of the strip passes through the final finishing stand, The procedure for estimating the coil diameter during rolling based on the stripping speed of the final finishing stand and the number of rotations of the mandrel of the winder, and after the tail end of the strip passes through the final finishing stand.
A procedure for estimating the winding coil diameter by determining the increase in the coil diameter during rolling from the strip thickness and space factor based on the mandrel rotation speed of the winder, and the procedure for estimating the winding coil diameter by determining the increase in the coil diameter during rolling based on the mandrel rotation speed of the winder. After passing through the tail end detector installed at
A procedure for predicting and controlling the mandrel rotation speed until the winding machine stops based on the winding coil diameter using the strip length from the tail end detector to a predetermined tail end stop position in the winding machine; and the prediction. A procedure for correcting and controlling the mandrel rotation speed leading to the winding machine stop, using a detection coil diameter detected by the opening degree when the Brocker roll contacts the winding coil as a winding coil diameter used for control. A method for controlling a stop position of a strip tail end of a winder, the method comprising: