JPS62240113A - Driving method for roller straightener - Google Patents

Abstract

PURPOSE:To improve the straightening effect of a plate stock by performing a braking action on the levelling roller group at the upper stream side of a roller straightening machine and by generating a tension between the levelling roller group at the upper stream side and levelling roller group at the downstream side. CONSTITUTION:A pinching roll 14 is driven with having a braking action by a motor 16 by adjusting the gap between the upper and lower pinching rolls 14, 14 and the gap between the upper and lower levelling rollers 2, 2. Each levelling roller 2 is driven by respectively individual motor 12 and a plate stock 17 is passed through between the pinching rolls 14, 14 and between the levelling rollers 2, 2. A tension is acted on the plate stock 17 by delaying the set speed with the 1st and 2nd levelling rollers 2 as the group performing the braking action and by quickening the set speed of the levelling rollers on and after the 3rd. In this way the work can be simply performed and the straightening effect due to the tensile force addition is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for driving a roller straightening machine for straightening a board with poor flatness to obtain a flat board.

[Prior Art] It is well known that when straightening a plate using a roller straightening machine, applying a tensile force to the plate improves the straightening effect.

4 and 5 show an example of a conventional roller straightening machine for thick plates, in which Q is a roller straightening machine, b is a plurality of leveling rollers for straightening plate material j, and C is each leveling roller. Backup roller d backing up leveling roller b
is a universal shaft for transmitting power to each leveling roller b, e is a pinion stand for transmitting power to each universal shaft d, f is a speed reducer, and g is an electric motor. All leveling rollers b can be driven by one electric motor Q. Or 30-lavender arranged on the entrance side of the roller straightening machine, i is a roller that bends the plate material j, k is a backup roller that backs up each roller i,! is a universal shaft for transmitting power to each roller i, and m is an electric motor.

When straightening the plate j with the above device, the gap between the upper and lower rollers i and 1 and the upper and lower leveling rollers b and b are
The electric motor m drives the roller i of 30-lavender h, the electric motor g drives the leveling roller b of the roller straightening machine Q, and the upper and lower rollers i, i
A plate j to be straightened is passed between the gap and leveling rollers b, and the plate j is pulled by an electric motor q, and at the same time, the electric motor m
By making the roller i function as a generator, the roller i performs a braking action, and straightening is performed while applying a tensile force to the plate material j.

Therefore, the leveling rollers that give the strongest bending in the roller straightening machine are the second to fourth rollers from the upstream side, depending on the total number of rollers, and when applying tensile force to the plate material j, It is desirable to maximize the tensile force near that point.

[Problems to be Solved by the Invention] However, in the conventional roller straightening machine shown in FIGS. 4 and 5, electric motors g and 30
- When a tensile force is applied to the plate j by the electric motor 1 m for driving the roller i of the lavender h, since there is only one electric motor g, for example, the third to fourth leveling rollers b
.

The tensile force F+' between 6 and 30 - lavender h of the first and second leveling rollers on the upstream side is
(See Figure 6).

Also, if you try to forcefully increase the tensile force F+', you will have to increase the tensile force F+', and the amount of bending of the plate j at 30-lavender h will have to be increased.
This results in 30-lavender h being expensive.

Furthermore, in the roller straightening t13a, although the peripheral speed of each leveling roller b has to be changed based on a certain law so as to be synchronized with the feed speed of the plate material j, one roller This is also impossible when driven by the electric motor q, and therefore each leveling roller b and plate material j slip.

Furthermore, the tensile force applied to the plate j cannot exceed the product of the straightening force generated between the plate j and the leveling roller b and the coefficient of friction between them, and if slippage occurs between the two, the coefficient of friction becomes static friction. The coefficient decreased from the coefficient of dynamic friction to the coefficient of dynamic friction, and from this aspect as well, it was not possible to apply a sufficiently large tensile force.

In view of the above-mentioned circumstances, the present invention is the second to third roller straightening machine.
This is done for the purpose of applying the largest tensile force near the fourth leveling roller.

[Means for Solving the Problems] The present invention provides a roller straightening machine in which all the leveling rollers can be driven independently. In minutes G, the group of leveling rollers on the upstream side performs a braking action that applies tensile force to the plate material in the same manner as the tensioning device installed on the upstream side of the roller straightening machine, and the group of leveling rollers on the upstream side and the downstream side perform a braking action that applies tensile force to the plate material. This creates a tensile force in the plate material.

[Function] A braking action is performed on the leveling roller group on the upstream side among the leveling rollers in cooperation with the tension applying device on the upstream side of the roller type stopper. A tensile force is generated between the leveling roller group and the leveling roller group.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention, in which upper and lower leveling rollers 2 of a roller straightening machine 1 are arranged at predetermined intervals from the upstream side to the downstream side in the traveling direction of the plate material 17. The leveling roller 2 is supported by a backup roller 3, and the upper roll group 4 is supported by the leveling roller 2 and backup roller 3 above the pass line of the plate 17, and by the leveling roller 2 and backup roller 3 below the pass line of the plate 17. Lower roller groups 5 are respectively formed.

The upper roller group 4 can be raised and lowered by a rolling down device, and can also be tilted in the direction of movement of the plate by a tilting device.

-〇- A universal shaft 6 is connected to each leveling roller 2, and a pinion 9 is fixed to an input shaft 8 and a pinion 9 fixed to an output shaft 10 is connected to the pinion stand 7, corresponding to the number of universal shafts 6. Large diameter gear 1 that pinion 9 meshes with
1 is stored, and each output shaft 10 has the universal shaft 6
are connected to each other, and an electric motor 12 is connected to the input shaft 8.

A pinch roll device 13 is disposed upstream of the roller straightening machine 1, and the upper and lower pinch rolls 14 of the pinch roll device 13 are connected to an electric motor 16 via a universal shaft 15. Further, the upper pinch roll 14 can be raised and lowered by a suitable lifting device, so that the plate material 17 can be held between the upper and lower pinch rolls 14.

When straightening the plate material 17 with the above device, the gap between the upper and lower pinch rolls 14.14 and the gap between the upper and lower leveling rollers 2, 2 are adjusted, and the pinch roll 14 is The leveling rollers 2 provided corresponding to the motors 12 are driven by individual electric motors 12 via the pinion stand 7 and the universal shaft 6, and the pinch rolls 14 and 14 are The plate material 17 to be corrected is passed between the gap and the leveling rollers 2, 2.

The speed is controlled to a circumferential speed that substantially satisfies the above conditions, and the operation is performed so that slippage between the leveling roller 2 and the plate material 17 is prevented as much as possible.

Here, V+, V+. 1; Circumferential speed h of the i-th and i+1-th leveling rollers 2! Nhf+]: Plate thickness ρ11ρi at the i-th and i+1-th leveling rollers 2, ]; Curvature radius of the plate material 17 at the 11th i+1-th leveling roller 2 Roll each leveling roller 2 of the roller straightening machine 1, for example, The first and second leveling rollers 2 are divided into two groups: a 10th group consisting of the first and second leveling rollers 2 and a 20th group consisting of the second leveling rollers 2 from the side. Similarly, as a group that acts as a brake, the set speed is set slightly slower than the formula (1), and the set speed of the third and subsequent leveling rollers 2 is slightly faster than the set speed of the (+) formula. A tensile force is applied between the third leveling rollers 2, 2.

Since the tensile forces F+, F2, F3, etc. determined by the product of the straightening force and the coefficient of static friction at each leveling roller 2 act in order from the upstream side of each leveling roller 2, they are added to the tensile force F of the pinch roll 14. Or, by subtraction, the tensile force between each leveling roller 2, 2 becomes as follows.

Between the pinch roll 14 and the first leveling roller 2;
F Between the first and second leveling rollers 2; F1'1 Between the second and third leveling rollers 2; F1
10F2 Between the 3rd and 4th leveling rollers 2; F+FI
+F2-F3 Between the n-1st and nth leveling rollers 2: F
+F1+F2-F3-Fn Therefore, the maximum tensile force F+FI +F2 is obtained between the second and third leveling rollers, which are the boundaries between the 10th and 20th group of leveling rollers 2. , this results in the second and third
The correction effect between the second leveling rollers 2 is significantly improved.

As the plate material 17 approaches the exit side of the roller straightening machine 1, the straightening load of the leveling roller 2 becomes smaller, so the tensile force that can be applied, that is, the product of the straightening load and the coefficient of friction, also becomes smaller. If you ignore this and try to apply a large tensile force on the exit side, slippage will occur between the plate material 17 and the leveling roller 2, and the plate material 17
In order to prevent this, it is better to set the circumferential speed of the leveling roller 2 near the exit side according to equation (1) to make the tensile force zero.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the method for driving a roller straightening machine of the present invention, <I)
The 10th group on the upstream side of the roller straightening machine and the 20th group on the downstream side
The boundaries of the groups need to be set between arbitrary rollers depending on the specifications of the plate material, but since the grouping can be done by electrical control of the motor, this work is extremely easy. Since there is no slippage between the plate and the plate material, the coefficient of static friction can be used to obtain the tensile force, and a greater tensile force can be obtained than with conventional methods, which improves the straightening effect by applying the tensile force. It can be effective.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the driving method of the roller straightening machine of the present invention, Fig. 2 is a view taken from the ■-■ direction arrow in Fig. 1, and Fig. 3 is a diagram showing the case where the roller straightening machine is driven by the driving method of the present invention. Fig. 4 is an explanatory diagram of the tensile force acting on the plate material, Fig. 4 is an explanatory diagram of a conventional roller straightening machine, Fig. 5 is a view taken in the v-■ direction of Fig. 4, and Fig. 6 is an explanatory diagram of a conventional roller straightening machine. It is an explanatory view of the tensile force which acts on a plate material when it is driven. In the figure, 1 is a roller straightening machine, 2 is a leveling roller, 6 is a universal shaft, 7 is a pinion stand, 12 is an electric motor,
13 is a pinch roll device, 15 is a universal shaft, 16
indicates an electric motor, and 17 indicates a plate material.

Claims (1)

[Claims] 1) In a roller straightening machine in which all the leveling rollers can be driven independently, the leveling rollers are divided into two groups of leveling rollers, one on the upstream side and the other on the downstream side in the direction of plate movement, and the upstream leveling roller group is Roller straightening characterized in that the tension applying device installed on the upstream side of the straightening machine performs a braking action that applies a tensile force to the plate material, and generates a tensile force in the plate material between the leveling rollers on the upstream side and the downstream side. How to drive the machine.