JPH0489135A - Method for changing over coiler of endless hot rolling - Google Patents

Abstract

PURPOSE:To eliminate the need for intricate deflectors by providing freely tiltable upper and lower pinch rolls behind a cutting machine and oscillating the pinch rolls and changing the direction of the front end of a strip toward the coiler which next coils the cut front end of a strip. CONSTITUTION:The freely tiltable upper and lower pinch rolls 1, 2 are provided behind the cutting machine and the cut front end of the strip 8 is easily directionally changed toward the coiler 9 which next coils the front end by oscillating the upper and lower pinch rolls. The change over between the coilers in endless hot rolling is speeded up and, therefore, the productivity is improved. The change over from the downstream coiler to the upstream coiler is possible as well. The need for the intricate deflector is eliminated in this way and the final end of the preceding strip is retained by the upper pinch roll. The foremost end of the succeeding strip is guided by the upper pinch roll.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for switching winders in endless hot rolling.

[Prior Art] In a hot rolling line, a rolled material is roughly rolled and finished rolled in units of slabs, and then rolled by a discontinuous rolling method in which the rolled material is wound into a coil using a winder. In this discontinuous rolling method, it is necessary to reduce the impact load when the rolled material is bitten into the rolling mill, and it is necessary to limit the rolling speed during biting. The rolling speed had to be varied in order to adjust the thickness and shape. Particularly when rolling a thin plate, in order to prevent the tip of the rolled material from lifting during the rolling process, the threading speed is limited until the winding machine starts winding the material around the mandrel. in this way,
In the discontinuous rolling method, the rolling speed fluctuates, resulting in low rolling efficiency, and there is wasted time for setup etc. between the rolling of the preceding rolled material and the rolling of the subsequent rolled material, reducing the efficiency of equipment usage. . In addition, there were problems such as poor shape easily occurring at the leading and trailing ends of the rolled material after finish rolling, resulting in poor production efficiency.

In order to solve such problems, Japanese Patent Application Laid-Open No. 61-014
Publication No. 003 (continuous hot rolling down coiler switching method),
JP-A-61-119326 (rolling line switching gate device) is disclosed.

[Problem to be Solved by the Invention 1] In the above-mentioned Japanese Patent Application Laid-Open No. 119326/1983, the winding machine is switched by moving the deflector 5a up and down as shown in FIG. 3 of the embodiment. In order to prevent the formation of scratches on the strip 8 when the deflector 5a moves up and down, the deflector 5a is provided with rollers 6.7. However, since the rollers 6.7 are installed in a narrow space, they must have a small diameter. Since the diameter of the roller 7 is small, there is a disadvantage that even if the position of the strip 8 that contacts the roller 7 is slightly shifted, the guiding direction of the strip 8 becomes unstable, and the strip tends to become unwindable. Also,
The mechanism of the deflector 5a is complicated. In addition, 1 in Figure 3
．． 2 is King Pinchrol.

Furthermore, in Japanese Patent Application Laid-Open No. 61-014003, each winder requires two sets of main and auxiliary pinch rolls, which makes the mechanism more complicated.

[Means for Solving the Problems] The present invention solves the above-mentioned problems and is applied to a winding machine switching method in endless hot rolling, and employs the following method. That is, the endless heating system is characterized in that tiltable upper and lower pinch rolls are installed downstream of the cutting machine, and the upper and lower pinch rolls are swung to change the direction of the cut end of the strip toward the winding machine that will wind it next. This is a method of switching winders during rolling.

[Function 1] According to the present invention, by swinging the upper and lower pinch rolls, it is possible to easily change the direction of the cut end of the strip toward the winding machine that will wind it next, thereby eliminating the need for endless hot rolling. In this case, switching between winding machines can be performed at high speed, so that productivity can be improved.

Note that it is of course possible to switch from the downstream winder to the upstream winder.

[Example] The present invention involves joining sheet bars upstream of the finishing mill entrance, endlessly hot rolling the joined sheet bars in the finishing rolling mill, and cutting the rolled strip upstream of the winding machine entrance. This invention relates to a winding machine switching method in endless hot rolling in which a strip is continuously wound by alternately switching between a plurality of winding machines arranged in series, and FIG. 1 shows a preferred embodiment of the present invention. FIG. 3 shows an explanatory diagram of a possible switching device;

Upper and lower pinch rolls l and 2 are installed in the housing 3,
The housing 3 is configured to be tilted by a hydraulic cylinder 4. Therefore, when winding the strip onto the winder 9, the housing 3 is swung as shown by the dotted line by the hydraulic cylinder 4, the center line passing through the centers of the upper pinch roll 1 and the lower pinch roll 2 is tilted, and the deflector 5 is It can be wound up toward the winding machine 9 side. When winding with a downstream winder, the housing 3 is returned to the position shown by the solid line in FIG. 1, and the deflector 5 is returned downstream.

Figure 2 shows how to switch the winder. FIG. 2(a) shows switching from the downstream winding machine to the upstream side, and FIG. 2(b) shows switching from the upstream winding machine to the downstream side. When switching the winding of the strip 8 from the downstream winder to the upstream winder, the upstream housing 3 is tilted to tilt the center line passing through the centers of the upper pinch roll 1 and the lower pinch roll 2.
The strip 8 is cut with the upstream winder in a winding preparation state. At this time, the upper pinch roll 1 and the lower pinch roll 2 of the downstream winder may not be tilted. This allows the tail end of the strip to be held down more reliably and improves the winding appearance of the coil.

When switching the winding of the strip 8 from the upstream winder to the downstream winder, the downstream housing 3 is tilted to pass through the center of the upper pinch roll 1 and the lower pinch roll 2 of the downstream winder. The center line is tilted, the downstream winder is in a winding preparation state, and the center line passing through the centers of the upper pinch roll 1 and the lower pinch roll 2 of the upstream winder is not tilted,
The upper vinyl roll 1 of the upstream winder cuts the strip without generating downward hydraulic force on the subsequent strip.

In this way, the winder can be switched.

[Effect of the invention] The present invention has the following excellent effects.

■A complicated deflector like the conventional technology is not required.

■The rear end of the leading strip can be held down with the main pinch roll.

■The leading edge of the trailing strip can be guided by the main pinch roll.

■In the conventional technology, two sets of pinch rolls were required for the upstream winder, but this can be replaced with one set of pinch rolls.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a switching device that can suitably implement the present invention;
FIG. 2 is an explanatory diagram of the switching method of the present invention, and FIG.
) is switching from the winder on the downstream side to the upstream side, Figure 2 (b)
FIG. 3 is an explanatory diagram of a conventional example of switching from an upstream winding machine to a downstream winding machine. ■, 2...Main pinch roll 3...Housing 4...Cylinder 5.5a...Deflector 6.7--Roller 8--Strip 9...Rewinder application agent people kawasaki

Claims (1)

[Claims] 1. A winding machine switching method in endless hot rolling, in which tiltable upper and lower pinch rolls are provided downstream of the cutting machine, and the upper and lower pinch rolls are oscillated to wind the cut end of the strip next. A method for switching a winding machine in endless hot rolling, which is characterized by changing the direction toward.