Boots – shoes – and leggings
Patent
1981-07-28
1984-12-04
Thomas, James D.
Boots, shoes, and leggings
364472, 364476, 72 6, 72 8, 72 11, 72 16, 72240, 72245, G06F 1546
Patent
active
044854978
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a multistage continuous rolling mill, and more particularly to a system for controlling the re-distribution of a load in a longitudinal direction of a single strip (which is called hereinafter within the plate) on a continuous hot rolling mill. More specifically, it concerns a re-distribution-of-load control apparatus for maintaining a predetermined ratio of the distribution of a rolling force to a multistage continuous rolling mill comprising an automatic screw-down setting device and a master drive control for the rolling mill and for preventing the shape of a product and more particularly the flatness thereof from deteriorating within the plate or suppressing an inclination of a rolling load toward a specified rolling mill.
2. Description of the Prior Art
The distribution of a load (a load called herein implies a rolling force) to each of a plurality of roll stands on a continuous rolling mill is an extremely important subject in view of the standpoint of the ensuring of a product's shape and the maintenance of the smooth operation thereof. In conventional continuous rolling mills, for example, continuous hot rolling mills, therefore, the distribution of a load to each stand which has been predetermined through an initial setting calculation (the setting before the metal-in-stand) so that it is preliminarily of a proper ratio but the exact control has not been effected with respect to the monitoring and correcting of the distribution of the rolling force in a longitudinal direction of a material after the rolling of the material has been initiated, which is called the passage of the plate.
On the other hand, the material rolling conditions are momentaly changed within the plate of a material for both the main causes on the side of the material and those on the side of the rolling mill. As a result, it is natural that the distribution of the load to each rolling mill is also varied upon and after the initial setting.
This situation is described by taking the case of a conventional hot finish rolling mill as shown in FIG. 1. In FIG. 1, element 1 designates a working roll on the hot finish rolling mill; element 2 is a backup roll; element 3 is an automatic roll-opening positioning device; element 4 is a main control system for the driving speed of the rolling mill; element 5 is a looper which is located between stands; element 6 is a looper height control system, element 7 is a rolling force sensor (a load cell); element 8 is an automatic gauge control device (which is called an RF.multidot.AGC); element 9 is a monitor AGC device; element 10 is a high speed X-ray AGC device; element 11 is a product gauge sensor disposed adjacent to the exit side of the finish rolling mill and S designates a rolled material (i.e. a strip). In FIG. 1, the strip S is successively gripped by stands of from F.sub.1 to F.sub.7 and as a result, a preliminarily estimated rolling force Pi is generated on the load cell 7 on each stand. When the strip S is gripped by each stand, the RF.multidot.AGC provided on each stand is actuated so as to tend to maintain an exit gauge on each stand at a stored value (which is called a lock-on value) at the beginning of a passage of the plate. Also, upon the strip S reaching the product gauge sensor 11, the monitor AGC device 9 and the high speed X-ray AGC device 10 are further actuated to control the final product's gauge to be held at a predetermined absolute gauge. Also, in order to maintain the tension between the stands at a constant value and to render the mass flow between the stands at a constant value in the steady state, the looper 5 is present and the looper height control system 6 effects the fine adjustment of each speed control system 4 for the rolling mill.
While the hot finish rolling proceeds as described above, the material on the entry side of the finishing stand has a temperature drop due to the heat dissipation, for example, and, as the trailing end of the plate is reached, the temperature member
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Mitsubishi Denki & Kabushiki Kaisha
Thomas James D.
Williams Jr. Archie E.
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