JPS5849334B2 - rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill that combines a vertical rolling mill and a horizontal rolling mill into a skewer shape.

For example, if a slab that has been continuously cast to a constant width is rolled to reduce the width after casting to obtain slabs of various widths, there is no need to change the width on the continuous casting machine, so the production of the continuous casting machine is reduced. That's how efficient it becomes.

In this case, in order to manufacture a slab whose width dimension is much smaller than the casting width, it is natural that it is necessary to carry out several passes of width reduction rolling.

However, if only widthwise rolling is performed, the widthwise ends of the slab will have a raised shape called a dogbone.
It is necessary to roll the slab in the thickness direction using horizontal rolls to eliminate the dog boats.

For this purpose, rolling equipment has been adopted in which several rigid rolling mills using rigid rolls and several horizontal rolling mills using horizontal rolls are arranged along a pass line.

However, in a rolling mill that combines a vertical rolling mill and a horizontal rolling mill, the slippage of the material during rolling does not meet the expected value as seen in conventional universal blooming mills, so the rolling mill It is difficult to perform speed synchronization accurately.

If speed rolling is not performed accurately, the vertical and horizontal rolling mills will pull or push each other together with great force due to motor torque.

However, if the rolling mills repeatedly pull and push each other with great force, a large impact will be applied between the two rolling mill housings, and a large force will be applied to the joints, causing significant wear and tear. As a result, other parts also become loose, leading to a major accident, which is a major problem.

The present invention has been made to solve the above problems by performing speed synchronization accurately. A load detector is installed between the rolling mill and the rolling mill to detect the pushing force between the rolling mills, and a device is connected to the detector to control the motor speed of the vertical rolling mill so that the pushing force becomes zero. It is.

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

Figures 1 to 3 show an embodiment of the present invention, in which a housing post of a rigid rolling mill housing 1 is used in a combination of a rigid rolling mill VM, a horizontal rolling mill HM, and a rigid rolling mill VM.
2a and the flange 4 of the horizontal rolling mill housing 3 are fastened by tie bolts 5, and the housing post 2a of the rigid rolling mill housing 1 and another housing post 2b facing the housing post 2a are connected by tie bolts 6. conclude.

Comrades Housing Post 2a and 2b? This is to shorten the distance between the supporting points in the width direction of the housing posts 2a and 2b, and to improve the strength of the housing posts 2a and 2b.

The details of the attachment part of the tie bolt 5 are shown in FIG. 2, and a load detector 7 such as a load cell is installed between the housing post 2a and the flange 4 so as to be able to detect the load P1 acting on the housing post 2a. It has become.

Further, details of the attachment part of the tie bolt 6 of the housing post 2a are shown in Fig. 3, and a load detector 8 is installed inside the housing post 2b so as to be able to detect the load P2 acting on the housing post 2b. It has become.

In the figure, 9 is a hard roll, 10 is a horizontal roll, and 11 is a washer.

The control circuit C for performing speed synchronization is shown in FIG. 10, 18 is a load speed converter connected to the load detectors 7 and 8, 19 is a load speed converter 18 and compensation at the time of next pass jamming. An adder connected to the arithmetic unit 20, 21 is the adder 1
9 and an adder connected to the speed compensation command device 22, 23
2 is an adder connected to the adder 21 and the speed command device 24; 25 is a rigid rolling mill motor connected to the adder 23;
6 is a horizontal rolling mill motor connected to the speed command device 24;
27 is a reduction scale.

During rolling, the speed command device 24 gives a speed setting signal NH to the horizontal rolling mill motor 26, and the adder 2
3 is also given a speed setting signal N, while the speed compensation command device 22 predicts the speed difference between the vertical rolling mill motor 25 and the horizontal rolling mill motor 26 due to the difference in strip width and thickness caused by rolling. Rigid rolling mill speed compensation signal "NVM" is manually given to adder 21, and also sent to adder 19.
r) is automatically added to the adder 21, and the rigid rolling mill speed compensation signal A Ny (=A
NVA+ANvM) is given to the vertical rolling mill motor 25 from the adder 23, and a vertical rolling mill speed compensation signal Nv (=N+JN
v) and start operation.

If speed synchronization is not performed accurately during rolling, the rolling mill will be pushed and pulled with great force by the motor torque.

Therefore, the load detectors 7 and 8 detect the load P1 or P2.
is detected, and the load signal is converted by the load speed converter 18 into a vertical rolling mill speed compensation signal JNvAA for performing feedback correction during rolling, and sent to the adder 19. The initial speed compensation signal ANvA. of the next pass (the current pass) is determined from the automatic compensation amount of the previous pass. and said vertical rolling mill compensation signal “VAA
are added to form the rigid rolling mill speed compensation signal ANvA,
In the same manner as described above, the adders 21 and 23 sequentially set the vertical rolling mill speed compensation signal JNytNV, and send NV to the vertical rolling mill motor 25 to correct the motor speed.

When the loads P1 and P2 are zero, no push or pull force acts on the rolling mill, speed change synchronization is performed accurately, and the loads P1 and P2
It is considered that the larger the value, the more insufficient the speed synchronization.

Therefore, control is performed so that the loads detected by the load detectors 7 and 8 become zero.

The vertical rolling mill speed compensation signal 'NVAA during steady rolling is sent from the adder 19 to the next pass biting compensation amount calculation device 20 and integrated, where it is calculated as the vertical rolling mill speed compensation amount for the next pass biting. is calculated.

FIG. 4 shows another embodiment of the present invention, in which load detectors 7, 8
The housing post of the rigid rolling mill housing 1}2a,
It is attached to 2b.

FIG. 5 shows still another embodiment of the present invention, in which a load detector 7
, 8 are attached to the flange 4 of the horizontal rolling mill...Ussing 3.

FIGS. 6 to 8 show still another embodiment of the present invention, in which a load detector 8 a t 8 b is attached between the roll chock 13 of the hard roll 9 and the hoisting post 2 a or 2 b to detect the load. The rolling mills 7a and 7b are installed between the roll chock 14 of the horizontal roll 10 and the horizontal rolling mill housing 3.

FIG. 9 shows yet another embodiment of the present invention, in which a load detector 8 is installed between the pedestal 15 protrusion 16 and the rigid rolling mill housing 1, and the load detector 7 is connected to the rigid rolling mill. Uzing 1
This is an example of a horizontal rolling mill installed between the seat 17 of the housing 3.

In the drawings, the same reference numerals as those shown in FIGS. 1 to 3 in FIGS. 4 to 10 indicate the same components.

Since the rolling mill of the present invention has the above-described configuration, speed synchronization can be performed accurately, and as a result, no large force acts between the rolling mill housings, improving safety.

In addition, in the embodiments shown in FIGS. 6 to 8, the load detection can be carried out using only the load detectors 8a and 8b provided in the roll chock 13 of the vertical rolling mill, and the load detection can also be carried out using only the load detectors 7a and 7b. It can be implemented by a combination of the devices 7a and 8b or a combination of 7b and 8a (in short, it is sufficient to detect the pushing and pulling force of the housing posts 2a and 2b), and various other changes can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is an explanatory plan view of one embodiment of the rolling mill of the present invention, Fig. 2 is a detailed view of the ■ part in Fig. 1, Fig. 3 is a detailed view of the - part in Fig. 1, and Fig. 4 is a detailed view of the part ■ in Fig. 1. An explanatory diagram of another example of the arrangement of the load detector used in the rolling mill of the invention, FIG. 5 is an explanatory diagram of still another example of the arrangement of the load detector, and FIG. 6 is an explanatory diagram of still another example of the arrangement of the load detector Explanatory diagrams of other examples, FIG. 7 is a view taken in the ■ direction of FIG. 6, FIG. 8 is a view taken in the ■ direction of FIG. 6, and FIG. 9 is a further explanation of the arrangement of the load detector. 10 are block diagrams of a control device used in the rolling mill of the present invention. In the figure, 1 is a vertical rolling mill housing, 2a and 2b are housing posts, 3 is a horizontal rolling mill housing, and 5 and 6 are tie bolts. , 8, 7a, 7b, 8a, and 8b are load detectors, VM is a vertical rolling mill, HM is a horizontal rolling mill, and C is a control circuit.

Claims (1)

[Claims] 1. In a rolling mill in which a vertical rolling mill and a horizontal rolling mill are arranged closely in a skewer shape, a load detector is installed between the vertical rolling mill and the horizontal rolling mill to detect the pushing and pulling force between the rolling mills, and the A rolling mill characterized in that the detector is connected to a device for controlling the motor speed of a five-sided rolling mill so that the pushing and pulling force becomes zero.