JPH0217243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a width reduction rolling device that is capable of rolling down both edges of a rolled material equally on the left and right sides.

In a conventional width reduction rolling apparatus, as shown in FIG. 1, the hard rolls b are arranged symmetrically with respect to the pass line center a, and the distance U/2 is equal on the left and right sides.

However, _the center c of the rolled material s shown in _FIG . The left and right sides are different, and the following problems occur.

(i) The position of the width changes and the width reduction concentrates on one width end, so the reaction force at the time of width reduction becomes large, which necessitates increasing the mechanical strength, which is wasteful.

(ii) Since the dogbone d produced after width rolling becomes asymmetrical as shown in Figure 2 (b), the rolling force distribution during horizontal rolling becomes uneven on the left and right sides, which causes meandering and bending of the rolled material.

(iii) The plate thickness distribution after horizontal rolling becomes asymmetrical due to the difference in the amount of extension of the dog bone, which causes problems in guide setting, handling, etc.

In view of the above-mentioned circumstances, the present invention has been made for the purpose of enabling width reduction of both edges of a rolled material equally on the left and right sides. a device that calculates the deviation of the width rolling force applied to the left and right vertical rolls based on the value detected by the rolling force detector, and a device that calculates the deviation of the width rolling force applied to the left and right vertical rolls based on the value detected by the rolling force detector, and a device that moves the left and right vertical rolls in the same direction so that the deviation becomes zero A device for moving the same amount.

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

Upper screws 2a, 2b and lower screws 3 whose longitudinal direction faces the width direction of the rolled material are installed in fixed housings 1a, 1b that are erected on both sides in the width direction of the rolled material s.
a, 3b, and fixed housings 1a, 1
The roll frames 4a, 4 are attached to the parts not shown in b.
b is disposed so as to be movable in the width direction of the rolled material, and the roll frames 4a, 4b are connected to the upper screw 2.
a, 2b and lower screws 3a, 3b to allow movement in the width direction of the rolled material, and upper screws 2a, 2b tips and roll frames 4a, 4b
and between the lower screws 3a, 3b and the roll frames 4a, 4b, respectively.
a, 5b, 6a, 6b are interposed so that the force acting on the roll frames 4a, 4b in the width direction of the rolled material s can be detected by the load cells 5a, 6a, 5b, 6b.

Upper fluid pressure cylinders 7a, 7b and lower fluid pressure cylinders 8a, 8b are attached to the roll frames 4a, 4b.
Attach the piston rods 9a, 9b to the upper fluid pressure cylinders 7a, 7b, and the piston rods 10a, 10b to the lower fluid pressure cylinders 8a, 8b.
Upper roll axle boxes 11a, 11b and lower roll axle boxes 12a, 12b are fitted to each other so as to be movable forward and backward in the width direction of the rolled material, and upper roll axle boxes 11a, 11b and lower roll axle boxes 12a, 12b are disposed on projecting parts (not shown) of roll frames 4a, 4b. Axle box 11
a, 12a, 11b, 12b with vertical rolls 13a,
13b, and the tips of the piston rods 9a, 9b are brought into contact with the sides of the upper roll axle boxes 11a, 11b, and the tips of the piston rods 10a, 10b are brought into contact with the sides of the lower roll axle boxes 12a, 12b. Vertical rolls 13 are installed at the ends of the upper shafts of 13a and 13b.
Spindles 14a and 14b for driving a and 13b are connected.

In addition, 15a and 15b in the figure are load cells 5a and 6.
an adder for adding the signals from the adders 15a, 5b, and 6b; 16 is a comparison adder for calculating the left and right rolling force deviation based on the signals from the adders 15a and 15b; 1;
7a and 17b are signal converters that determine whether the signal from the comparison adder 16 is positive or negative; 18a and 18b are signal converters 17a and 17b and an interval setting device 19
an adder 20 for adding signals from a and 19b;
a, 20b, 21a, 21b are adders 18a,
Based on the signal from 18b, servo valves 22a, 22b, which are provided in the pipes that supply pressure oil to the chambers in the upper and lower fluid pressure cylinders 7a, 7b, 8a, and 8b.
a comparison adder, 24, sending signals to 23a, 23b;
a, 24b, 25a, 25b are piston rods 9
a, 9b, 10a, 10b and compares the signals with adders 20a, 20b, 21a, 21
This is the sensor that sends it to b.

Next, the operation of the present invention will be explained.

During width reduction rolling, the upper and lower screws 2
a, 3a, 2b, 3b are driven by a drive device (not shown) to move the roll frames 4a, 4b in the width direction of the rolled material to change the large stroke setting. , 2b, 3a, and 3b are not moved. and,
To change the setting of the small stroke in addition to the setting change of the large stroke, set the positions of the piston rods 9a, 9b, 10a, 10b for positioning the vertical rolls 13a, 13b in the interval setters 19a, 19b. 7a, 8a, 7b, 8
By supplying pressure oil to b, the vertical rolls 13a,
13b is set to a predetermined interval. To change the width within one coil, use piston rods 9a, 9b, 10.
Since we will use piston rods a and 10b, piston rods 9a and 9
Normally, the upper and lower screws 2a, 3a, 2b, 3b are moved to the initial standby position of the screws 2a, 10a, 10b so that they are at the center of the cylinder stroke. The interval setting amount is, for example, the vertical rolls 13a, 13b.
If the rolling reduction amount at
W ₀ −ΔW. Then, the value obtained by subtracting the set movement amount of the upper and lower screws 2a, 3a, 2b, and 3b from W ₀ -ΔW is the value obtained by subtracting the set amount of movement of the upper and lower screws 2a, 3a, 2b, and 3b.
It is set to be equally divided by a and 10b. In this case, the amount of movement of the piston rods 9a, 10a, 9b, 10b is determined by the sensors 24a, 25a, 24b, 25b.
Detected in

At a certain time during width reduction rolling, the vertical roll 1
Pass line center L ₁ between 3a and 13b and rolled material s
However, as shown in Fig. ₄ , for example, suppose that the rolled material s has shifted by δ to the right when looking from the upstream side of the rolled material to the downstream side due to bending, etc. (this phenomenon is This is likely to occur when a rolled material is simultaneously bitten by another adjacent rolled material.) Then, the rolling reaction force exerted on the vertical rolls 13a and 13b by the rolled material s becomes P ₁ on the vertical roll 13a side and P ₂ on the vertical roll 13b side, making it uneven on the left and right sides, but the rolling reaction force P ₁ is h ₂ /hP ₁ is detected by the load cell 6a as h ₁ /hP ₁ and becomes P ₁ by the adder 15a. Similarly, the rolling reaction force P ₂ is detected by the load cells 5b and 6b and becomes P ₂ by the adder 15b. The rolling reaction forces P ₁ and P ₂ are respectively sent to the comparison adder 16 to calculate the left and right rolling force deviation ΔP=P ₁ - P ₂ , and the signals are sent to the signal converters 17a and 17b for signal conversion. In the device 17a, the input positive signal is converted into a negative signal and outputted, and the rolling force deviation is converted into a position change. Since it is a feedback system, the conversion constant may be an appropriate value that does not cause the system to oscillate. Further, the signal is not converted by the signal converter 17b and is output in the same manner as in the case of the signal converter 17a. In addition
When P ₁ and P ₂ are not equal, there is a phenomenon in which the board moves by itself so that it becomes equal, but when the board is being bitten by an adjacent stand, P ₁ and P ₂ remain unequal.

The signals output from the signal converters 17a, 17b are added to the set intervals set in adders 18a, 18b, and then sent to comparison adders 20a, 21a, 20.
b, 21b, and comparison adders 20a, 21
Servo valves 22a, 23 from a, 20b, 21b
A, 22b, 23b are sent a signal, and the servo valve opens by a predetermined amount according to the signal, causing the piston rods 9a, 10a to move to the right as seen in Figure 3, and the piston rods 9b, 10b to move to the right as seen in Figure 3. and move to the right by the same amount, and the vertical rolls 13a, 1
3b also moves to the right in FIG. 3 while maintaining the same interval W ₀ -ΔW, and if the left-right rolling force deviation output from the comparison adder 16 becomes ΔP=0, the vertical rolls 13a and 13b pass. Since the line center _L1 and the center _L2 of the rolled material coincide in terms of load balance, all servo valves are switched and the movement of the piston rod is stopped.

FIG. 5 shows another embodiment of the present invention, which differs from the previous embodiment in that an adder 18a and an adder 18a whose intervals can be set by interval setters 19a and 19b;
Servo valves 22a, 23a, 22 directly from 18b
b, 23b, and pressure detectors 26a, 26b, 27 instead of load cells.
This is because a and 27b are used. or,
In the figure, the same reference numerals as those shown in FIG. 3 indicate the same components. In this embodiment, the interval setter 19a,
19b may be linked to enable setting of the same amount. Also, an integral element may be included in the comparison adder 16 to stabilize the system.

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.

Since the width reduction rolling apparatus of the present invention has the above-described configuration, it can achieve various excellent effects as described below.

() The center of the vertical roll opening can be aligned with the center of the rolled material in the width direction while the vertical roll opening is fixed, so the dog bones that occur during width reduction rolling are equal on both edges of the rolled material, and the plate after horizontal rolling is Meandering and bending (camber) can be prevented.

() Even when width-reducing a curved rolled material, equal pressure is generated on the left and right sides, so there is no need to increase the strength in anticipation of an increase in the rolling load on one side, as in the past, and costs can be reduced.

() Uneven wear on both vertical and horizontal rolls can be prevented, extending the life of the rolls.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a conventional width reduction rolling machine;
Figure A is an explanatory diagram of the rolled material rolled by the width reduction rolling machine of Figure 1, Figure 2 B is an explanatory diagram of the dogbone that occurs when the rolled material of Figure 2 A is width rolled, and Figure 3 is an illustration of the present invention. FIG. 4 is an explanatory diagram of the width reduction rolling apparatus of the present invention for width reduction. FIG. 5 is an explanatory diagram of another embodiment of the width reduction rolling apparatus of the present invention. . 1a, 1b are fixed housings, 5a, 5b, 6
a, 6b are load cells, 7a, 7b are upper fluid pressure cylinders, 8a, 8b are lower fluid pressure cylinders, 9
a, 9b, 10a, 10b are piston rods, 1
3a, 13b are vertical rolls, 15a, 15b, 18
a, 18b are adders, 16, 20a, 20b, 2
1a and 21b are comparison adders, 17a and 17b are signal converters, 22a, 22b, 23a and 23b are servo valves, and 24a, 24b, 25a and 25b are sensors.

Claims (1)

[Claims] 1. A rolling force detector that detects the width rolling force applied to the left and right vertical rolls, and a device that calculates the deviation of the width rolling force applied to the left and right vertical rolls based on the value detected by the rolling force detector. , and a device for moving the left and right vertical rolls by the same amount in the same direction so that the deviation becomes zero.