JPH0671607B2 - Width press buckling prevention method and device - Google Patents

Description

The present invention relates to a buckling prevention method and device for a width press.

[Prior Art] Although it has been researched that the width reduction of a material such as a slab is performed by a press capable of achieving a large reduction amount, the material is apt to buckle due to the action of a large width reduction force. A pressing roll for preventing buckling is set on the flat surface of the material of the portion where the step is performed.

[Problems to be Solved by the Invention] However, the above-described conventional pressing roll has various problems because its position is fixed with respect to the die of the width press. That is, when the material is width-reduced by the width press, the action center of gravity of the pressing force applied to the material by the mold changes in the longitudinal direction (the front-rear direction of the mold) of the material at the front and rear ends and the intermediate portion of the material. As a result, the pressing position of the presser roll, which is fixed, shifts from the position of the center of gravity of the action, and as a result, effective pressing cannot be performed and buckling occurs, or a large pressing force is applied to prevent the buckling. When it is made to act, there is a problem that the material is flawed.

The present invention has been made in view of the above conventional problems, and an object thereof is to adjust the pressing position of the material by the pressing roll so as to be the most effective position for preventing buckling.

[Problems to be Solved by the Invention] The present invention is intended to solve the above technical problems.
When pressing the width of the material with a width press die, press the flat surface of the material to prevent buckling of the material. The invention relates to a buckling prevention method for a width press and a device therefor, which is changed to match the center of the width reduction force distribution of the width press die.

[Operation] Therefore, in the present invention, the effect of moving the pressing roll so that it coincides with the center position of the width reduction force distribution in the width press die at the time of width pressing the front and rear ends of the material and the steady part Can be carried out.

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

FIGS. 1 and 2 show an example of the present invention. The width press dies 2 and 3 configured to perform the width reduction of the material 1 by pressing the both width end surfaces of the material 1 such as a slab are made of the material 1. They are arranged opposite to each other across the line, and the width press die 2,
Pressing rolls 4 and 5 for preventing the buckling of the material 1 are provided on the material upper and lower planes between the three.

The upper pressing roll 4 is adapted to adjust the pressing force against the material 1 by the pressing cylinder 6, and the pressing cylinder 4 is moved on the rail 9 via the wheel 8 by the operation of the position adjusting device 7 such as a cylinder. The material 1 is supported on a press roll carriage 10 which can be moved and adjusted in the line direction.

Further, detectors 11 and 12 for detecting the front and rear ends of the material 1 are provided in the vicinity of the lower presser roll 5, and the detectors 11 and 12 are also provided.
An arithmetic and control unit 16 is provided which inputs the front and rear end detection signals 13 and 14 and the command signal 15 to perform an arithmetic operation, and the pressing force instruction signal 17 from the arithmetic and control unit 16 causes the pressing force of the pressing cylinder 6 to be changed. A pressing force setting device 18 for setting and a position setting device 20 for setting the position in the line direction of the presser roll 4 by the position adjusting device 7 by the position instruction signal 19 are provided.

Further, the lower presser roll 5 is a semi-fixed type in which the pressing force can be freely adjusted by the presser cylinder 4 like the upper presser roll 4 or the pressing position can be set by a screw shaft or the like. However, the position is adjusted together with the upper pressing roll 4 in the line direction. In the figure, 21 is a hydraulic pump and 22 is an oil tank.

As shown in FIGS. 2 (A), (B), and (C), the width reduction force distribution by the press dies 2 and 3 at the front end portion, the intermediate portion, and the rear end portion of the material 1 under the width reduction. (Width reduction amount distribution) changes. Therefore, the width reduction force distribution is measured based on the relationship between the positions of the press dies 2, 3 and the material 1, and the centers P ₁ , P ₂ , P _{3 of the} width reduction force distribution corresponding to the position of the material 1 are measured. The positions L ₁ , L ₂ and L ₃ with respect to the width press dies ₂ and ₃ are measured.

When the material 1 is carried in as shown by the arrow in FIG. 1 and the width of the tip is pressed as shown in FIG. 2 (A), the tip is detected by the detector 11, and the detection signal 13 is detected by the arithmetic and control unit 16
Entered in.

When the detection signal 13 is input, the arithmetic and control unit 16 outputs the pressing force instruction signal 17 to the pressing force setting unit 18 based on the command signal 15, so that the oil pressure corresponding to the signal 17 is applied to the pressing cylinder. 6 is applied to the flat surface of the material 1 with a required pressing force.

On the other hand, at this time, the feed amount of the material 1 for each width press by the intermittent press is known in advance, and the feed amount of the material 1 for each width press in the case of the running press is also known. By inputting the detection signal 13 of the tip of the material 1 to the arithmetic and control unit 16, it is possible to obtain the positional relationship between the tip of the material 1 and the press dies 2, 3 when the tip of the material 1 is width-reduced. Therefore, the position L ₁ of the center P ₁ of the width reduction force distribution in this positional relationship is calculated by the calculation control device 16, and the center P ₁ of the width reduction force distribution and the axial center of the presser roll 4 are made to coincide with each other. The position indication signal 19 is output to the position setting device 20. As a result, the hydraulic pressure corresponding to the signal 19 is applied to the position adjusting device 7 to adjust the position of the presser roll carriage 10 so that the axial center of the presser roll 4 coincides with the center P ₁ of the width reduction force distribution.

Further, as shown in FIG. 2 (B), even during width pressing of the longitudinal middle stationary portion of the material 1, the center P ₂ of the width reduction force distribution and the axial center of the presser roll 4 should be aligned with each other. As shown in FIG. 2 (C), the center P _{3 of the} width reduction force distribution is also based on the detection signal 14 at the rear end of the material 1 detected by the detector 11 even when the width of the rear end of the material 1 is pressed. And the axis of the presser roll 4 are automatically adjusted so that they coincide with each other. Further, the detector 12 is used when the material 1 is conveyed in the direction opposite to the arrow.

In this way, the width reduction force distribution is different at the front end portion, the stationary portion, and the rear end portion of the material 1, but the center of the width reduction force distribution is
By adjusting the positions of the press rolls 4 and 5 so that the axes of the press rolls 4 and P ₃ always coincide with P ₁ , P ₂ and P ₃ , it is possible to effectively press the material 1 and prevent buckling or the like. .

The present invention is not limited to the above-mentioned embodiment, and the positioning of the press roll in the line direction may be performed based on the width reduction amount distribution by the width press die. May be performed only when the front end of the material and the steady part are rolled down, and at the rear end where the amount of reduction is small, if buckling is not a problem, it may be pressed at the same position as the steady part. It is needless to say that various devices can be adopted as the device for moving the roll in the material line direction, and various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the buckling prevention method and device of the width press of the present invention, the width reduction force distribution of the width press die that changes during the width reduction of the front, rear end, and stationary portions. Accordingly, by adjusting the pressing position of the pressing roll, the most effective position can always be pressed, and the excellent effect of effectively preventing buckling of the material can be obtained.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention, and FIGS. 2 (A), (B), and (C) are width reduction forces at the time of width reduction of the front end portion, stationary portion, and rear end portion of the material. It is an explanatory plan view showing a distribution. 1 is a material, 2 and 3 are width press dies, 4 and 5 are press rolls, 6 is a press cylinder, 7 is a position adjusting device, 10 is a press roll carriage, 11 and 12 are detectors, 16 is an arithmetic and control unit, 18 is a pressing force setting device, and 20 is a position setting device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobu Nagakura No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi, Kawashima Harima Heavy Industries, Ltd. Yokohama Second Factory (72) Inventor Takahiro Yokoyama New, Isogo-ku, Yokohama-shi, Kanagawa Nakahara Town No. 1 Ishi Kawashima Harima Heavy Industries Ltd. Yokohama Second Factory

Claims (2)

[Claims] 1. A pressing position of a pressing roll for pressing a flat portion of a material to prevent buckling of the material at the time of width reduction by a width press die, at least one of a front end and a rear end of the material. A method for preventing buckling of a width press, characterized in that the constant shape part is changed to match the center of the width reduction force distribution of the width press die. 2. A position adjusting device for moving the press roll in the material line direction, a detector for detecting the position of the material with respect to the width press die, and a position of the press roll based on a detection signal of the detector. And a position setting device that operates the position adjusting device according to an instruction signal from the arithmetic and control unit. Buckling prevention device for width press.