JPS6353882B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill for width rolling a material, such as a slab.

A fishtail F as shown in FIG. 1 is generated at the leading and trailing ends of a product obtained by reducing a slab or a continuously cast slab 1 by a large width, and this fishtail causes an increase in clot loss and a reduction in rolling yield.

As a countermeasure against this problem, it is known that a method of indenting the leading and trailing corners of the slab before rolling using a press as shown in FIG. 2 is effective in reducing clotup loss. (Japanese Patent Application No. 53-145102) In the case of a normal slab, the pressing force required for this push-forming press reaches several thousand tons, and the equipment cost is extremely high.

On the other hand, the vertical rolling mill that performs width reduction rolling after this pressing operation is also a large piece of equipment because it generates a large rolling load.Recently, vertical rolling mills are often equipped with hydraulic cylinders, It has come to have a similar function.

The object of the present invention is to reduce the amount of equipment by equipping a vertical rolling mill with the function of a forming press.

The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 is a diagram illustrating details of the present invention.

1 is a slab, 2 is a vertical roll, and has a caliber part 3 in the center. 4 holds the bearing 5 with an upper roll chock. 6 holds the bearing 7 with a lower roll chock. 8 is a press mold placed adjacent to the vertical roll caliber 3, and the lower roll caliber 6
is fixed. Reference numeral 9 denotes an inner stand of the vertical rolling mill, and the inner stand 9 and the roll jocks 4 and 6 are engaged to be slidable in the vertical direction.

Reference numeral 10 denotes a roll lifting device which integrally lifts and lowers the vertical roll, caliber, upper and lower roll chocks, bearings, and press dies 2 to 8 via the lower roll chock 6. 11 is a hydraulic cylinder, and 12 is a reduction screw, which is rotated by an electric motor 14 via a worm reducer 13. 15 is a rolling nut screwed into the rolling screw; 16 is a vertical rolling mill housing that houses the inner stand 9 movably in the width direction of the slab.

The operation of the present invention will be explained with reference to FIG. First, the inner stand 9 is designed with a screw 12 to an opening degree that matches the width of the slab. At this time, the hydraulic cylinder 11 is on the contraction side as shown in the figure. On the other hand, the vertical roll group including rolls 2 to 8 is raised by the lifting device 10 to a position where the press die 8 clamps the slab.

In this state, when the tip of the slab enters the caliber of the press die 8 and stops, the hydraulic cylinder 11 is operated to push the inner stand 9, and after press-forming the corner of the slab, the cylinder expands the inner stand 9 again. Next, the slab is transferred and the same operation as described above is performed for press forming of the rear end corner of the slab. After moving the slab backwards, the vertical roll group of 2 to 8 is lowered by the lifting device 10,
Thereafter, the press-formed slab is returned again and subjected to width reduction rolling by the caliber portion 3 of the vertical roll 2.

The structure of the present invention can be changed without impairing its basic characteristics. For example, the lifting device 11 may be provided between the housing 16 and the inner stand 9 so that the vertical roll groups 2 to 8 are moved up and down together with the inner stand 9. Further, the screw 12 is not necessarily required, and the hydraulic cylinder 11 may be directly attached to the housing 16 as in a normal press.

As described above, the present invention provides a press mold adjacent to the roll caliber of the V mill, and by raising and lowering these molds integrally, the V mill is given the function of a U press, reducing clot loss and improving rolling efficiency. The aim is to improve

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a material in which fishtails have occurred, FIG. 2 is a perspective view of a press-formed material, and FIG. 3 is a longitudinal sectional view of the apparatus of the present invention. 1...Slab, 2...Vertical roll, 3...Caliber section, 4...Upper roll chock, 5, 7...Bearing, 6...Lower roll chock, 8...Press mold, 9...Vertical rolling machine , 10... Roll lifting device, 11... Hydraulic cylinder, 12... Rolling down screw, 13... Worm reducer, 14... Electric motor, 15... Rolling nut, 16... Vertical rolling mill housing.

Claims (1)

[Claims] 1 In a vertical rolling mill, a caliber roll and a press mold are disposed adjacent to the caliber portion of the roll in the axial direction, and a roll that moves the caliber roll and the press mold integrally in the axial direction of the roll. A width reduction type rolling mill equipped with an elevating device and a reduction device that moves a caliber roll and a press die in the width direction of the material.