JPS5868416A - Sheet passing device of rolling mill - Google Patents

Abstract

PURPOSE:To improve biting properties of a material to be rolled, and to give a desired backside tension, by press-clamping the material to force-feed it into between rolling rolls, and making a pressing force of a sheet feeding device which gives a backside tension to the material after said feeding, at the time of rolling larger than said force at the time of feeding based on the moving quantity of clamping members. CONSTITUTION:When an arrival of the tip of a material 1 to be rolled is detected by a position detector 11, the position of the tip is successively obtained by an arithmetic circuit 12 from signals of a detector 9 of the number of revolutions. At the time when the tip protrudes by a prescribed quantity after passing through the space between open clamping members 4 and 5, a stop signal is given to a driving device 10 of feed rollers 8 from a circuit 12. Next, a command for setting a large pressing force is given to a controlling device 13 for driving a pressing cylinder from the circuit 12, and after clamping, starting signals are given to a controlling device 14 for driving a moving cylinder 7, and to the device 10. The time, when the tip of the material is moved to the position from which the tip is forced into the rolls 2 and 3, is detected, the moving of the material is stopped, and then commands are given to each drive controlling device so as to change the pressing force to a small force capable of giving a prescribed backside tension.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet passing device for a rolling mill that clamps a rolled material and supplies the rolled material to rolling rolls.

Conventionally, as a sheet threading device for a rolling mill, a pair of clamping members press and hold the rolled material, guide it toward the rolling rolls, and forcibly push it between the rolling rolls, thereby improving the biting property of the rolled material. There is also a method that prevents the rolled material from meandering by pressing and clamping the rolled material with the clamping members to apply back tension to the rolled material even during rolling after biting.

However, with conventional devices, the pressing force is constant during pushing and rolling, so it is not possible to significantly improve the biting property and prevention of meandering, especially in high-reduction rolling machines where rolled materials are difficult to bite. The problem is that it is not suitable. In other words, if the pressing force is increased to prevent slippage between the rolled material and the clamping member and to improve the biting property, the back tension during rolling also increases, which causes excessive friction between the rolled material and the clamping member. This generates heat and power loss, and requires frequent replacement of the clamping members as their lifespan decreases.

Of course, the rolling material cannot be bitten by the rolling rolls with a small pressing force that provides an appropriate back tension.

The present invention has been made to solve the above-mentioned problems, and is capable of improving the biting property of the rolled material into the rolling rolls and imparting desired punctures/jones to the rolled material during rolling. The purpose is to provide a plate device that detects when the clamping member has moved a predetermined amount toward the rolling roll,
The method is characterized in that the pressing force during pushing is set larger than during rolling based on this detected value.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is an overall layout diagram including the control system of the sheet threading device;
The figure is a detailed diagram showing the structure of the threading device around the rolling mill.

1 is a rolled material, 8 is a feed roller that sends the rolled material 1 to the rolling mill, 9 is a rotation speed detector of the feed roller, 11 is a position detector that detects the arrival of the tip of the rolled material, and 2 and 3 are rolling rolls. . No. 2 on the upstream side of this rolling roll
0 includes a pair of upper and lower clamping members 4 and 5 for clamping the rolled material 1, a pressing cylinder 6 for moving the clamping member 4 downward to press the rolled material, and rolling rolls 2 and 3 for holding the rolled material 1. A threading device consisting of a moving cylinder 7 for guiding and pushing the sheet into the gap is arranged.

12 is a feed roller drive control device 1 based on the signals from the position detector 11 and the feed roller rotation speed detector 9.
0. This is a circuit that calculates command signals to the drive control device 13 for the pressing cylinder and the drive control device 14 for the movable cylinder.

The operation will be explained below.

When the arrival of the tip of the rolled material is detected by 11, the position of the tip of the rolled material is sequentially determined by the calculation circuit 1 based on the signal from the rotation speed detector.
Obtained by 2. When the tip passes between the clamping members 4 and 5, which are open, and protrudes by a predetermined amount, the arithmetic circuit 12 gives a stop signal to the feed roller drive control device 10. Next, a command signal for setting a larger pressing force is given to the suppression cylinder drive control device 13 from the arithmetic circuit 12, and a start signal is given to the post-clamping movement cylinder drive control device 14 and the feed roller drive control device 10.

When a position detector (not shown) detects that the movable cylinder 7 has moved toward the rolling roll by a predetermined amount, specifically, to a position where the tip of the rolled material is pushed into the rolling roll, the movable cylinder 7 is stopped. A command signal is given to each drive control device to switch to a small pressing force that can provide a predetermined back tension.

According to this embodiment, since the position of the tip of the rolled material is detected and the pressing force is switched, the rolled material can be reliably pushed in, and a desired back tension can be immediately applied after pushing.

Of course, the position of the tip of the rolled material can be detected based on a signal from a position detector placed upstream of the rolling roll, a signal from the feed roller rotation speed detector mentioned above, or a predetermined operating time determined in advance for the moving cylinder. The pressing force may also be changed over.

According to the present invention, it is possible to improve the biting property of a rolled material into a rolling roll, and to provide a desired back tension during rolling. Therefore, there is an effect that high reduction rolling can be performed without causing power loss or meandering.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the threading device including a control system, and FIG. 2 is a diagram showing the structure of the threading device in detail. ■... Strip, 2, 3... Roll, 4, 5
... Holding member, 6... Suppressing cylinder, 7... Moving cylinder, 8... Feed roller, 9... Rotation speed detector, 10... Feed roller drive control device, 11.
...Position detector, 12... Arithmetic circuit, 13... Pressing cylinder drive control device, 14... Moving cylinder drive control device. 1st day/;l: /3 \, -181

Claims (1)

[Scope of Claims] 1. A rolling machine that presses a rolled material compressed and clamped by a clamping member capable of applying a pressing force between rolling rolls, and after pushing, applies back tension to the rolled material by the pressing force and performs rolling. A rolling device characterized by comprising means for detecting the amount of movement of the clamping member, and a device for setting a larger pressing force during pushing than during rolling based on a signal from the detecting means. Machine threading device. 2. The sheet threading device for a rolling mill according to claim 1, wherein the detection means comprises a position detector. 3. In claim 1, the detection means:
A sheet passing device for a rolling mill, comprising means for detecting that a predetermined period of time has elapsed after the clamping member started moving in the direction of the rolling rolls.