JPH0381010A - Hot rolling mill - Google Patents

Abstract

PURPOSE:To avoid the trouble in the plate running out and to improve the efficiency and yield, by arranging a looper equipped with a rotating roller capable of positive and reverse rotations by fluid at the tip thereof between rolling stands. CONSTITUTION:A hot rolling mills provided with plural rolling stands is arranged with a looper which equips a rotating roller 1 capable of positive and reverse rotations by fluid at the tip thereof. At the plate passing time, the roller 1 is positively rotated to give thrust by a friction force to the tip of the material to be rolled and to guide it without folding the material to be rolled to the roll gap of the succeeding stand. Also at the running out time, the roller 1 is reversely rotated to give a braking force by the friction force to the tail end of the material to be rolled and to guide it without folding the material to be rolled to the roll gap of the succeeding stand.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot rolling mill, particularly a hot finishing mill for hot rolling strips and strips.

[Prior Art] In a hot finishing rolling mill for strip, a looper is disposed between stands. The reason is that in hot rolling, when tension between stands occurs, tensile force is applied to the rolled material between the stands, resulting in a reduction in its cross-sectional area.

In order to avoid this, a looper is provided and its height is adjusted during rolling to reduce the tension to zero, thereby preventing dimensional fluctuations.

Threading and shearing are sometimes carried out with the looper tilted down.

[Problems to be Solved by the Invention] However, the prior art has the following problems. In other words, during sheet passing, the tip of the material to be rolled is in a non-tensioned state and is pushed out by the rolling force, but before it is bitten by the next stand, it is bent by the contact resistance of various guides between the stands, rolled over, and broken. Problems such as roll flaws occur. This tendency is particularly noticeable in the latter stage stand where the material to be rolled is thin and has low rigidity. Also,
During tail removal, sometimes after the material to be rolled leaves the front stand, the tail end of the material to be rolled bends due to inertia before it bites into the next stand, causing problems such as breakage and roll flaws due to over-rolling. The object of the present invention is to solve the above-mentioned problems and to provide a hot rolling mill in which threading and ash removal can be carried out smoothly.

[Means for Solving the Problems] A hot rolling mill according to the present invention is a hot rolling mill equipped with a plurality of rolling stands, and has a rotary mechanism between the rolling stands that can be rotated forward and backward by a fluid at its tip. This is a hot rolling mill equipped with a looper equipped with rollers.

[Operation] The hot rolling mill of the present invention is a hot rolling mill equipped with a plurality of rolling stands, in which a looper having a rotary roller that can be rotated in forward and backward directions by a fluid is disposed between the rolling stands at its tip. During sheet threading, this roller rotates in the normal direction and applies thrust (tension for the rolled material) due to frictional force to the tip of the rolled material, bending the rolled material into the gap between the rolls of the following stand. Guidance without incident. In addition, in some cases, the rollers are reversed to apply frictional braking force (tension for the rolled material) to the tail end of the rolled material, and the rolled material is bent into the gap between the rolls of the following stand. Guide without.

[Eleventh Practical Example] FIG. 1 is an explanatory diagram showing one embodiment of the present invention. The looper main body consists of a looper frame 2 and a looper roll 1.The main body is rotated around an axis 4 by a looper motor 3.The main body is tilted by this, and during rolling, it moves up and down to control tension, and threads the sheet. , it is located at the lower limit when pulling the butt.

A water wheel 5 is arranged at the end of the looper roll shaft (not shown) and is driven by a nozzle 6.7. Nozzle 6 rotates the water wheel in the normal direction, and nozzle 7 rotates the water wheel in the reverse direction. These nozzles are connected via line 8.9 to a switching valve 10 which, via line 11 and on-off valve 12, is connected to a pressure water source.
(not shown).

During sheet passing, a sensor (not shown) detects when the material to be rolled arrives just before the hot rolling mill, opens an on-off valve, and a switching valve switches the water channel to the conduit 8 of the nozzle 6. . As a result, the water wheel rotates in the normal direction, and the tip of the material to be rolled is given tension and guided to the roll gaps of each stand without any hindrance. A sensor (not shown) detects that the material to be rolled has reached the final stand and closes the on-off valve. When the tail end of the material to be rolled passes just before the hot rolling mill, the sensor detects this, opens the on-off valve, and the switching valve switches the water channel to the conduit 9 of the nozzle 7. As a result, the water wheel is reversed, and the tail end of the material to be rolled is applied with tension and guided to the roll gap of each stand without any hindrance.

By implementing the present invention, the number of troubles in threading and shearing the blade, which previously occurred in 30 cases, has been reduced by half.

[Effects of the Invention] As described above, according to the present invention, troubles in removing ash from one strip are avoided by driving the looper roll and correctly guiding the tip and tail ends of the strip to the roll gap, thereby improving efficiency and improving efficiency. This has the effect of improving yield.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. 1... Looper roll, 2... Looper frame 3
...looper motor, 4...axis, 5...water wheel,
6.7... Nozzle, 8.9... Pipe line, 1o... Switching valve, 11... Pipe line, 12... On/off valve.

Claims (1)

[Claims] A hot rolling mill equipped with a plurality of rolling stands, in which a looper having a rotary roller that can be rotated in forward and backward directions by a fluid is disposed between the rolling stands.