JPS5934109A - Detecting device of flatness of thin sheet - Google Patents

Abstract

PURPOSE:To exhibit fully detection sensitivity, by applying a certain presure to connecting parts and end parts of outermost shafts of a device in such a direction that a thin sheet is pressed to the device and detecting the deflection quantity of each shaft on the basis of the position where respective shafts of rolls are on the same axial line. CONSTITUTION:Shafts 22a-22e to which rolls 21a-21e are attached freely rotatably are connected to one another bendably. A certain pressure is given to connecting parts and end parts of outermost shafts in such a direction that a thin sheet 20 is pressed downward. The deflection quantity of each shaft is detected on the basis of the position where shafts 22a-22e are on the same axial line, and the flatness of the thin sheet 20 is detected in accordance with deflection quantities of shafts. Thus, the flatness is detected with sufficient detection sensitivity even if the difference of expansion in the breadthwise direction of the thin sheet 20 is large.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flatness detection device for a thin plate obtained by rolling a plate made of ferrous or non-ferrous metal using a rolling mill, particularly a cold thin plate rolling mill.

[Technical background of the invention]

When a plate made of iron or non-ferrous metal is rolled into a thin plate using a cold thin plate rolling mill, the medium-heated part of the plate tends to be thick and the ends in the width direction of the plate tend to be thin.

Figure 1 shows this state in an exaggerated manner (it is a φ type diagram,
1 and 2 are upper and lower rolling rolls supported by bearings (not shown); 3 is a plate rolled by these rolling rolls 1 and 2; 4 is the force acting on each roll from the bearing supporting the upper and lower rolling rolls 1.2, and 5 is the force acting on the plate 3.
It shows the force generated to roll.

Therefore, as is clear from the schematic diagram shown in FIG.
Although the forces of and 5 are balanced, the bending moment of the rolls remains, causing the upper and lower rolling rolls 1.2 to bend at a larger distance at the center of the plate 3 than at the edges. Because of this, the plate 3 is thick in the center and thin at the edges, but the plate 3
If the thickness before rolling is the same at the center and at the ends, this means that the ends are stretched longer.

As a result, the rolled plate is not flat but wavy.

As a means to correct this, the shape of the upper and lower rolling rolls is made into a cylindrical shape, and a small pengu device is used to apply a bending moment to the upper and lower rolling rolls in order to cancel the bending moment If mentioned above. However, it is well known that the flatness of the plate can vary in complicated ways due to the addition of 'fil<< in the center and local thermal expansion of the rolls.

By the way, several devices σ have been proposed or used for measuring the flatness of a thin sheet rolled and formed by a conventional cold thin sheet rolling mill, and one of them is a split roll type flatness device. There is a degree detection device.

Fig. 2 and Fig. 3 schematically show this, Fig. 2 is a side view showing the arrangement relationship with the rolling roll, and Fig. 3 is a front view of the split roll type flatness detection device. . Top as shown in Figure 2.

The thin plate 10 flattened by the lower rolling roll 1.2 is detected by the roll 1 of the flatness detection device installed on the exit side of the rolling mill.
1 and is wound onto a monitoring drum (not shown). As shown in FIG. 3, the flatness detecting device divides the rolls 11a to 11e into three or more pieces (in this example, five pieces) at equal intervals in a straight line in the width direction of the thin plate 10. and attached to the shaft 12, each of these rolls l
II on both sides of la~lie (11 parts bearing J, ?A~1
3f and each bearing 1311 to 13ff
, load cells 16g to 16f are provided in the middle of the support 15a supported on the pedestal 14'' to each bearing 138 to 1.
The force applied to 3f is detected.

In the split roll type flatness detection device having such a configuration, the thin plate 1o that is rolled and sent by the upper and lower rolls 1 and 2 of the IrE machine is divided while being stretched with an appropriate tension from the front and back. is in contact with each of the rolls IIa to llf. In this case, if the thin plate 10 is not flat, the tension will be different at each part of the plate in the IIJ direction due to the difference in elongation. Therefore, the force applied to each bearing 13a to 13f varies depending on the tension distribution acting on the thin plate 10 in the 1J direction, and these forces
6f, respectively. Therefore, based on the signals detected by each load cell 168 to 16f, the thin plate 10
The flatness of the thin plate 10 can be determined by determining the degree of deviation between the central portion and both ends thereof in the width direction.

[Problems with background technology]

However, in such a flatness detection device, the force applied to the bearings 13a on both sides of each of the divided rolls lla to llf is detected by the load cells 16a to 16f, so the entire device is expensive. becomes.

Furthermore, if the difference in the elongation of the row falcon 10 in the middle direction is large, sufficient tension will not be applied to the elongated portion of the plate, resulting in a decrease in detection sensitivity.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to sufficiently demonstrate the detection sensitivity even when the difference in elongation in the middle direction of the thin plate is large, and to make the entire device inexpensive. The present invention aims to provide a thin plate flatness detection device.

[Summary of the invention]

In order to achieve such an object, the present invention installs three or more rolls having the same length so that they can freely rotate on their respective axes on the exit side of a cold thin plate rolling mill, so that the axes of these rolls are coaxial. The shafts of each of the rolls are arranged at equal intervals in the width direction of the sheet so as to be on a line, and the shafts of the rolls are connected to each other so as to be bendable, and a constant pressure is applied in the direction of pressing the thin sheet against each of these connecting portions and the outermost shaft end. is given, the amount of deviation of each axis of the roll is detected based on the position when the axes are on the same axis, and the flatness of the thin plate is detected from the amount of deviation. be.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Fourth
The figure is a front view showing a configuration example of a flatness detection device for a thin plate according to the present invention. In FIG. 4, 20 is a thin plate sent from a cold thin plate rolling mill, 21a to 21e are the same lengths, and 21e and 21e are rolled to rolls 21g and 21g, respectively.
is attached to each of the Ills 22a to 22e so as to be freely rotatable. And each of these rolls 21
a to 21e are the respective axes 22 in the width direction of 4 of the thin plate 20.
a to 22e are arranged in a straight line, and each @ll, ? 2a to 22e are bendably connected to each other. In addition, 23 to 28 are each roll 21 a to 21
A hydraulic cylinder piston mechanism supporting 22e to the axis 22m of e, each of these hydraulic cylinder piston mechanisms 23 to
28 piston rods 23a to 29m are connected to each shaft 228 to 2
2e and the outermost shaft end, and the trench cylinders 23b to 28b are respectively connected to a hydraulic supply device υ29 via a common pipe line 30. On the other hand, 31 to 36 are piston rods 23a to 28
a) An abbreviated iron piece with one end attached to each, and the other end of each of these iron pieces 31 to 36 is a differential transformer 37 to 42 consisting of a primary coil and two secondary coils connected with opposite polarity. It is inserted into the air core. Each of these differential transformers 32 to 42 has piston rods 23a to 28a.
The amount of movement is detected, and the detection signal is obtained as a differential output from the secondary side. Reference numeral 43 denotes a clearing device that calculates the flatness of the thin plate 20 by calculating the difference in elongation between the central portion of the thin plate 20 and both ends of the plate in the +lj direction based on these detection signals.

Next, the operation of the thin plate flatness detection device configured as described above will be described. Now from the hydraulic pressure supply device 29 to each cylinder piston mechanism 23 to 28 cylinders 23b 28b
When a certain amount of pressure oil is supplied inside the piston rod 23
a to 28a to the information 122a of each roll 218 to 21e2
2e A force is applied to the mutual connection portion and the outermost shaft end. Then, since the rolls 21a to 21e all have the same length, the same pushing up force acts on the thin plate 20 in the IJ force direction.Here, as shown in the figure, the thin plate 20 is If the elongation of both ends in the width direction of the plate is large, the piston rod 2 corresponding to the portion of the thin plate 20 where the elongation is large among the piston rods 23a and 28a.
The amount of movement of 3g and 288 is quite large, and the piston rods 24 & and 27a1 correspond to the parts with little elongation, and the piston rods 25a and 26a correspond to the parts with little elongation.
The amount of movement becomes smaller sequentially. In other words, each piston rod 23a to 28a (the moving portion thereof depending on the flatness of the RI thin plate 20) becomes larger or smaller.

In this way, each piston rod 23a to 28a is connected to the thin plate 20.
When moved according to the flatness of the differential transformers 37 to 42
The iron pieces 31 to 36 inserted into the air core also move by the amount of movement of each piston port/nod 23a to 28a, and a differential output corresponding to the amount of movement is applied from the secondary side. They are respectively added to the arithmetic unit 43. This calculation device 43 uses the piston rod 23 based on these differential outputs.
The amount of movement from a to 28th is calculated as a function of the difference in elongation of the thin plate 20, and the flatness of the thin plate 20 is determined. In other words, each of the rolls 21a to 21e ll1lI22a to 22e are the same.
The amount of deviation due to the movement of the piston rods 23a to 28a detected based on the position when they are on the pivot leg is the thin plate 2θ.
jP flatness is determined by using the fact that it is a function of the difference in elongation of .

Therefore, if a thin plate flatness detection device having such a configuration is used, each of the rolls 21a to 21ef can be freely rotated and the respective shafts 22a to 22e, which are provided with additional volumes, are connected to each other in a bendable manner, and each of these connecting portions is connected to each other in a bendable manner. A constant pressure is applied to the outermost shaft end in the direction of pushing up the thin plate 2θ, and each shaft 22a is
The amount of deviation of the axis is detected based on the position when 22e is on the same axis line, and the flatness of the M plate 20 is detected from the amount of deviation. Even when there is a large difference in elongation in the direction, detection can be performed with sufficient detection sensitivity. Furthermore, since an expensive load cell is not used as in the conventional method, the entire device can be made inexpensive.

In the above embodiments, the width of the plate does not change during rolling, but in many cases the width of the plate varies, so at least three rolls are provided in contact with the plate. There is a need. In other words, three rolls are sufficient if the thin plate has simple elongation at both ends or center elongation, but five or more rolls are required for more complicated elongation such as 3/4 elongation.

Also, each roll must be placed in contact with the thin plate,
If there are rolls that do not touch the board, this will result in what is called dry shaking, so either a stopper should be installed to stop the roll at an appropriate upper limit position, or the hydraulic pressure supplied to the cylinder-piston mechanism should be adjusted according to the width of the board. A selection valve for stopping the oil may be provided in the oil supply pipe.

Furthermore, in the above embodiment, a cylinder-piston mechanism applies a constant pressure by hydraulic pressure to the connection between the respective axes of each roll, but any type of pressure may be used as long as a constant pressure can be applied to the connection. . Further, although the amount of movement of the piston rod is detected by the differential transformer, it may be detected by, for example, Magnescale (trade name) or other detectors. It goes without saying that this pond water invention can be modified and implemented in various ways without completely changing its gist.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a thin plate flatness detection device that can sufficiently exhibit detection sensitivity even when the difference in elongation in the width direction of the thin plate is large, and that can be made at a low cost as a whole. .

[Brief explanation of drawings]

Fig. 1 is a schematic diagram for explaining the state of a plate 11 that is rolled and formed by a cold thin plate rolling machine, and Figs. 2 and 3 are schematic diagrams of a conventional ITS plate flatness detection device. 2 is a side view showing the arrangement relationship with the rolling rolls, FIG. 3 is a front view of the flatness detection device, and FIG. 4 is an embodiment of the thin plate flatness detection device according to the present invention. FIG. 20 ... thin plate, 21 a to 21 e-0-le, 22
8-22e... Shaft, 23-28... Cylinder-piston mechanism, 23a-28a... Piston rod, 23
b-28b...Cylinder, 29...Pressure oil supply device, 30...Pipeline, 31-36...Iron piece, 37-42
...Differential transformer, 43... Arithmetic device. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] For detecting the flatness of a thin plate obtained by rolling a plate made of ferrous or non-ferrous metal using a mill, it is possible to freely rotate three or more rolls having the same length on their respective axes. These are provided at equal intervals in the width direction of the thin plate so that the respective axes are on the same axis, and the axes of the respective rolls are connected to each other so as to be bendable, and each of these connecting portions and Applying a constant pressure t-/j in the direction of pressing the thin plate against the outermost shaft end, detect the amount of deviation of each shaft of the roll based on the position when the shafts are on the same axis, and A thin plate flatness detecting device characterized in that flatness is detected by determining the difference in elongation of the thin plate in the plate 11'' direction from the amount of displacement.