JPS5874202A - Cutting method for coiling end part of steel plate for rolling - Google Patents

Abstract

PURPOSE:To bite a steel plate stably and surely by cutting the coiling end part of the steel plate in such a way that the cut end face has a wedgelike chamfered shape and the edges of the cut end face have a projecting arc shape. CONSTITUTION:The coiling end part of a steel plate S to be coiled on a coiler is cut by a cutter 13 provided at the intermediate of the outlet line of a pickling line for steel plates a and the coiler in such a way that the cut end face has a wedgelike chamfered shape and the edges of the cut end face have a projecting arc shape in the outlet side direction of the pickling line. If the cut steel plate coil is set on a pay-off reel on the inlet side of cold rolling mills and is uncoiled and if the preceding end of the uncoilded steel pkate is bitten in the rolling mills, the angle of bites of reduction rolls decreases; therefore the steel plate is bitten stably and surely into the rolling mills.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a coil winding end portion of a steel plate for rolling.

For example, when rolling a steel plate using a cold rolling mill, generally
The coils of steel sheets to be rolled are unwound one by one onto a payoff reel, and the unwound steel sheets are sent to a cold rolling mill.

In this case, if the thickness of the steel plate is greater than or equal to this value, the steel plate will not bite into the rolling rolls.

This n is called the limit plate thickness for biting, and it is determined by the friction angle and biting angle depending on the relationship between the roll diameter and plate thickness.
Ru.

In the pickling process, which is a pre-process of cold rolling, the thicker the steel plate, the better the rolling and stopping speed, which is desirable. The thickness of the steel plate at the entrance side of the rolling mill cannot be increased beyond a certain level.

In addition, poor biting of the steel plate causes roll wear, roll flaws, and the like.

Conventionally, when the steel plate gets caught, kerosene, etc. are sprayed on the tip of the steel plate to increase the friction coefficient, and when it is not possible to get the steel plate simply caught, a pushing device is used to push the steel plate into the gap between the rolls of the steel plate. He was taking measures.

Furthermore, when a small-diameter work roll mill is introduced into the front stand and high pressure reduction rolling is performed, the reduction amount becomes large in the first floor stand, and this, combined with the reduction in the diameter of the rolling rolls, makes jamming a particularly important problem. It's coming.

Furthermore, from the viewpoint of automatic sheet threading into a rolling mill, stable and reliable engagement of the steel sheet was desired.

The present invention has been developed in view of the above circumstances, and an example of its implementation will be described below based on the drawings.

As shown in Fig. 1, uncoiler 11 shear one end plate processing 2
, a welding machine 3, an inlet coil dolphin 4, a scale breaker 5, a pickling tank 6, a cleaning device 7, a dry car 8, an outlet coil car 9, a side rear 1O1, an oil application ful 1, etc. Bickling Lie, N's Exit (Kou Yuso fil)
The winder a! is located between the winder 12 and the winder 12. As shown in FIGS. 2 and 3, the winding end portion of the steel plate S which has been wound up into 12 pieces has a cut end surface having a wedge-shaped chamfered polygonal shape, and an edge of the cut end surface facing toward the exit side of the bicking line. Cutting scissors fl 13 were provided for cutting into a convex arc shape.

In this way, a steel plate coil in which the cut surface and cut end surface edge of the winding end of the steel plate coil are formed into a wedge-shaped chamfered multi-shape and a convex circular arc shape is mounted on a payoff reel on the entry side of a cold rolling mill. Then, the tip of the unwound steel plate (winding end) is inserted into the rolling mill.

In this case, since the tip of the steel plate (port finishing end) has a multi-shaped wedge-shaped chamfer, the biting angle of the rolling roll is small, and therefore the steel can be fed to the rolling mill.

Furthermore, since the tip edge of the steel plate has a convex arc shape, the impact load when the steel plate is caught in a rolling mill can be reduced.

In addition, as mentioned above, the cut end face and the cut end face edge of the winding end portion of the steel plate S to be wound into winding B2 @ 12 have a wedge-shaped chamfered shape and a convex arc shape.The winding is completed. It is possible to reduce the occurrence of end marks at times.

This means that the steel plate S on the side opposite to the winding end portion of the steel plate S
The winding top part of (chain i in Fig. 211, Figure 3) also has a cut end face and a cut end blood relation having a symmetrical spiky chamfer shape and a concave arc shape, so that the winding top part of the following steel plate S It is possible to reduce the occurrence of top marks at the initial stage of winding.

In addition, as the cutting scissors #13, for example, the cutting scissors shown in FIGS.
As shown in the figure, a clamper 14 that clamps the steel plate S,
Above this clamper 14, a pedestal 15 is installed perpendicular to the steel plate S, and on this pedestal 15, a rail 15 is installed.
A truck 16 is moved perpendicular to the steel plate S by an electric motor (not shown), a bender mirror 17 is provided on the truck 16, and a rail 15 is placed on the truck 16 (not shown). A cart 18 that is moved in the longitudinal direction of the steel plate S by an electric motor, a bender mirror 19 provided on the cart 18, a laser torch, a condensing lens 21, an Og gas nozzle for fusing, and a stand separate from the stand 15. At the top, cutting scissors made of laser oscillation and a cutter movable vertically and horizontally in synchronization with the trolley 16.18 were used.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a steel plate bicking line showing an example of the implementation of the method of the present invention, Fig. 2 is a side view of the cut end shape of the winding end of the steel plate, and Fig. 3 is a diagram of the winding end of the steel plate. FIG. 4 is a plan view showing an example of the cutting device, and FIG. 5 is a side view thereof. 2t'XI Figure 4 Figure 5

Claims (1)

[Claims] A cutting device is installed between the claw side of the pickling line of the steel plate and the winding machine, and the winding end of the steel plate that is wound on the winding machine is cut with a wedge-shaped chamfer. shape, and the cut end edge is angled toward the exit side of the bicking line.
A method for cutting a coil winding end of a rolling steel plate, the method comprising cutting into a convex arc shape.