JPH06304611A - Press device for edging hot slab - Google Patents

Abstract

PURPOSE:To prevent the generation of a dog bone and bulging at the time of edging a slab. CONSTITUTION:This device is a press device for edging a hot slab with which, after executing width setting of press dies 1, 2 having an expansively inclined part and parallel part on the slab entering side where are provided opposing to both sides in the width direction of slab in accordance with the edging amount of slab as continuously or intermittently feeding a hot slab 3 which is extracted from a heating furnace, the slab is edged into a prescribed width by approaching or separating the dies. The press dies 1, 2 are provided freely movably in the vertical direction, also a pair of constraining dies 6, 7 whose mutual constraining surfaces 8, 9 are opposed in the upper and lower parts of the slab 3 are provided freely movably in the horizontal direction and the upper constraining die 7 of the constraining dies 6, 7 is provided freely movably in the vertical direction. In this way, the generation of the deformation of the slab is prevented, the table elevating/lowering equipment on the outlet side of the edging press is unnecessiated and also the yield of product is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a width reduction pressing apparatus for hot slabs extracted from a heating furnace in a hot rolling line.

[0002]

2. Description of the Related Art Hot rolled products are produced by heating a slab in a heating furnace and hot rolling with a rough rolling machine or a finish rolling machine to obtain a thickness of 1.0 to
It is manufactured by making a 25.4 mm strip, winding it on a coil, cooling it, and then treating it in various conditioning lines.
The slab width in the hot rolling is determined according to the coil width. The relationship between the slab width and the coil width is generally associated with the edger ability and the width accuracy. In terms of process operation, it is desirable to integrate slab sizes, and in particular because of the need to integrate continuous casting lots, the width reduction capacity of the edger tends to be increased.

The edger of the slab is classified into a width rolling method using a vertical rolling roll and a sizing press method in which a width reduction is performed by a width reduction press. As shown in FIG. 2, the sizing press includes a hydraulic cylinder 51 attached to a fixed portion, and a pair of metal molds 52 having a parallel portion and a portion inclined parallel to the slab entry side on a crankshaft driven by a motor. Then, the slab 53 is continuously or intermittently passed between the molds 52, 52 to form the slab 53.
The dies 52, 52 are moved close to and away from each other without upper and lower restraint to perform width reduction to a predetermined width. Further, as shown in FIG. 4, a method in which only the widthwise end portion of the slab 53 is constrained in the vertical direction by a concave mold 54 and press-molded (JP-A-58-58).
No. 53301) is proposed. These sizing presses are slightly inferior in rolling ability compared to width rolling with vertical rolling rolls, but on the other hand, the fish tail at the front and rear edges of the rolled material generated after hot rolling can be made small and the yield is good, and the dogbone The feature is that the cross-sectional shape of is less likely to be concentrated in the vicinity of the edge portion, and good flatness of the rolled material is easily obtained.

When the width reduction of the slab is performed by the sizing press, buckling at the front and rear ends of the slab and a dog having a locally thickened end in the width direction of the slab as shown in FIG. The width reduction is restricted due to the bone 55, or the bulging 56 as shown in FIG. 3 (b) in which the central portion in the width direction becomes thicker over the entire length of the slab, or the restriction of the press equipment capacity. For example, there is a problem that buckling at the front and rear ends deteriorates the sheet passing property after the sizing press, and in the worst case, the sheet passing becomes impossible. Also, if the width reduction in the sizing press is too large, dog bones and bulging also increase, twisting of the slab after pressing, buckling, etc. occur, making subsequent rolling difficult, and making the cross-sectional shape during horizontal rolling difficult. There is a problem that the correction cannot be completed. Further, when the thickness reduction in the slab width direction is performed by horizontal rolling, for example, as shown in FIG.
As shown in FIG. 5, at the central portion in the longitudinal direction, the dog bone and the bulging are width-returned in the plate width direction. As a result, the hot-rolled material has a narrow plate width at both ends in the longitudinal direction and a wide shape at the central portion side, and in order to keep the plate width as a product constant, the widened portion of the plate width must be cut off. However, there is a problem that the yield is reduced. Therefore, when the width of the slab is reduced by the sizing press, it is impossible to compress the width by a certain amount or more, which is an impediment factor for further integration of the slab width in continuous casting.

As a method for changing the width of the slab, the width of the slab is pressed by a press to roughly narrow the width dimension of the slab, and the non-uniformly deformed portions on both side surfaces of the slab caused by the above steps are formed on the next vertical roll. To uniformly flatten in the longitudinal direction, and further flatten the deformed portions of the upper and lower surfaces of the slab caused by the above-mentioned steps with a horizontal roll (Japanese Patent Laid-Open No. Sho 6-62).
No. 0-141301) has been proposed.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method disclosed in Japanese Laid-Open Patent Publication No. 1301 is to squeeze both sides of a slab roughly with a press, and then flatten the unevenly deformed portions on both side surfaces and upper and lower surfaces of the slab generated in the above step.
It is not possible to reduce the width by a certain amount or more by the sizing press, and it is impossible to significantly reduce the width of the slab. In addition, when flattening the upper and lower deformation parts such as dog bones and bulging caused by the width reduction of the slab by horizontal rolls, the plate width direction of the dog bone and bulging is the same as in the case of thinning in the slab width direction by the horizontal rolling. Width return to.

It is an object of the present invention to provide a hot slab width reduction press device capable of preventing the occurrence of dog bones or bulging when the slab width reduction is performed by a sizing press.

[0008]

[Means for Solving the Problems] The inventors of the present invention have made extensive studies to achieve the above object. As a result, when performing a predetermined width reduction with the sizing press, by constraining the upper and lower surfaces of the slab with a restraining die to perform width reduction,
The inventors have found that the slab can be stretched in the longitudinal direction to prevent dog bones and bulging from occurring and have a smooth wall thickness, and that the slab can be uniformly width-reduced over the entire length in the longitudinal direction.

That is, according to the present invention, while the hot slab extracted from the heating furnace is continuously or intermittently fed, the hot slab is parallel to the slab entrance side provided on both sides in the width direction of the slab. A press die having a portion, after the width is set corresponding to the amount of slab width reduction, in the width reduction press device of the hot slab to perform width reduction to a predetermined width by approaching and separating, one of the press dies. The restraint surfaces are provided movably in the vertical direction, and a pair of restraint dies are arranged movably in the horizontal direction with the restraint surfaces facing each other above and below the slab. It is a width squeezing press device for hot slabs, which is provided so as to be freely movable.

[0010]

According to the present invention, one of the press dies is provided movably in the vertical direction, and a pair of the restraint dies are arranged movably in the horizontal direction with the restraint surfaces of the slab facing each other. Since the upper restraining die of the restraining dies is provided to be movable in the vertical direction, the slab can be restrained by the upper and lower restraining dies and the width can be reduced by the press die, and the upper and lower surfaces of the slab by the upper and lower restraining dies can be reduced. The slab can be stretched in the longitudinal direction without being deformed to the upper and lower surfaces such as dog bones and bulging due to the restraint, and can be finished to a smooth plate thickness surface, and the slab width can be reduced to a uniform slab width in the entire longitudinal direction of the slab. can do.

In this case, one of the press dies is provided movably in the vertical direction, and a restraining die for restraining the upper and lower surfaces of the slab is arranged movably in the horizontal direction. Since the mold is provided so as to be movable in the vertical direction, by horizontally moving the press die and the restraint die, it is possible to form a rectangular cross section corresponding to the slab width change in the press die and the restraint die, The hydraulic pressure is relieved in accordance with the horizontal movement of the press die during the width reduction, and the restraining die is horizontally moved to form a rectangular cross section corresponding to the width reduction.

Further, by moving one of the press dies and the upper restraining die in the vertical direction, the pressing die and the restraining die can form a rectangular cross section corresponding to the change of the slab thickness. In the present invention, one of the press dies and the upper restraining die are movably provided in the vertical direction because the cross section corresponding to the change of the slab thickness between the pressing die and the restraining die with reference to the upper surface of the lower restraining die. This is to prevent one of the press dies from interfering with the upper restraining die when forming the rectangular shape.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view of a width reduction pressing device of the present invention. In FIG. 1, reference numerals 1 and 2 are press dies, and a pair of them are arranged horizontally in parallel with each other with pressure surfaces 4 and 5 facing each other on both sides in the width direction of the width reduction slab 3. 6, 7
Is a constraining die, and a pair of constraining surfaces 8 and 9 are arranged on the upper and lower portions of the width reduction slab 3 so as to face each other. The press die 2 and the constraining die 7 are arranged so as to be movable in either one of the directions perpendicular to the contact surface of the slab 3 so that the width and the thickness of the slab 3 can be changed.

Numeral 10 is a reduction width positioning cylinder of the press die 1, 11 is a reduction width positioning cylinder of the press die 2, which are fixed to the width reduction press bodies 12 and 13, respectively.
By operating the width-reducing positioning cylinders 10 and 11, the distance between the pressing surfaces 4 and 5 of the press dies 1 and 2 can be adjusted according to the width dimension of the slab 3. Reference numerals 14 and 15 are crank shafts for horizontally reciprocating the narrow press main bodies 12 and 13. The crank shafts 14 and 15 are connected by a synchronous shaft 16, and when the motor 17 is started, the crank shaft 14, the synchronous shaft 16 and the crank shaft are driven. The left and right press dies 1 and 2 are configured to approach and separate from each other in synchronization via 15. Reference numeral 18 is a slab thickness positioning cylinder of the restraint die 7 that performs slab thickness positioning based on the restraint die 6 that does not move in the vertical direction below, and the slab thickness positioning cylinder 18 can perform widthwise positioning according to the slab width dimension. A frame that moves horizontally by the operation of a horizontal moving cylinder 19 with a relief valve that also has a function of horizontally moving the restraining mold 7 by relief of hydraulic pressure according to the movement of the press molds 1 and 2 during the width reduction. It is fixed at 20.

Reference numeral 21 is a horizontal moving cylinder with a relief valve for horizontally moving a frame 22 to which a restraining die 6 which does not move vertically downward is fixed, and 23 is a width reducing press main body 13.
The frame 24 to which is attached is vertically moved by a vertical moving cylinder so that the press die 2 does not interfere with the restraining die 7 due to the slab thickness dimension. Two
Reference numeral 5 denotes a bevel gear shaft, which has a spline shape because the crank shaft 15 moves up and down when the frame 24 is moved in the vertical direction by the operation of the vertical movement cylinder 23.

With the above configuration, when the slab 3 is reduced in width to a predetermined width, first the horizontal moving cylinder 21 is operated to horizontally move the frame 22,
After the restraining die 7 is set at a predetermined position, the width reduction positioning cylinders 10 and 11 are operated to adjust the distance between the pressing surfaces 4 and 5 of the press dies 1 and 2 to a predetermined width dimension. Then, the slab thickness positioning cylinder 18 and the vertical movement cylinder 23 are operated to move the constraining die 7 and the frame 24 in the vertical direction, and the distance between the constraining surfaces 8 and 9 of the constraining die 6, 7 is set to the slab thickness before the width reduction. Adjust to and press die 2
Is moved in the vertical direction so as not to interfere with the constraint die 7 due to the slab thickness dimension. And if you drive the motor 17,
The press dies 1, 2 together with the width-reducing press bodies 12, 13 via the synchronous shaft 16, the crank shaft 14, and the crank shaft 15.
Repeats approaching and separating, and the preparation for rolling down the slab 3 width is completed.

When the slab 3 width reduction preparation is completed,
When the slab 3 is fed between the press dies 1 and 2 and the restraining dies 6 and 7 which are separated from each other, the slab 3 which is fed between the press dies 1 and 2 is the pressing surface 4 of the press dies 1 and 2. 5, the width is sequentially reduced to a predetermined width. In this case, since the upper and lower surfaces of the slab 3 are constrained by the constraining dies 6 and 7, the slab 3 is stretched in the longitudinal direction to prevent the generation of dog bones and bulging, and to uniformly reduce the width in the longitudinal direction. Moreover, a smooth slab thickness can be obtained and deformation can be prevented. The press dies 1 and 2 move horizontally as the width reduction of the slab 3 proceeds, but the horizontal moving cylinders 19 and 21 move in accordance with the movement of the press dies 1 and 2.
The hydraulic pressure is relieved from a relief valve (not shown), and the restraining molds 6 and 7 move horizontally together with the frames 22 and 20, so that the press dies 1 and 2 and the restraining molds 6 and 7 are prevented from interfering with each other and the cross section is always rectangular. It becomes possible to press. In the above embodiment, the pressing mechanism is an electric crankshaft and the upper and lower surfaces of the slab are constrained by hydraulic cylinders.However, the pressing mechanism may be a hydraulic cylinder or the like, and the upper and lower surfaces of the slab may be constrained by an electric motor or other drive source. Needless to say, the object of the present invention can be achieved.

[0018]

As described above, according to the present invention,
The width reduction of the hot slab in the hot rolling line can be performed without generating dog bones or bulging, the deformation of the slab is prevented from occurring, and the exit table lifting equipment of the width reduction press becomes unnecessary. The yield reduction of products can be improved, and the slab width can be further integrated in continuous casting.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a width reduction pressing device according to the present invention.

FIG. 2 is a schematic explanatory view of a conventional width reduction pressing device.

FIG. 3 is a diagram showing a deformation caused by width reduction of a slab.
(A) is a cross-sectional view of the dog bone, and (b) is a cross-sectional view of the bulging.

FIG. 4 is a cross-sectional view when the press die is a concave die.

FIG. 5 is an explanatory diagram of width return due to dog bone or bulging.

[Explanation of symbols]

 1, 2 Press die 3, 53 Slab 4, 5 Pressurizing surface 6, 7 Restraint die 8, 9 Restraint surface 10, 11 Reduced width positioning cylinder 12, 13 Reduced width press body 14, 15 Crankshaft 16 Synchronous shaft 17 Motor 18 Slab thickness positioning cylinder 19, 21 Horizontal movement cylinder 20, 22, 24 Frame 23 Vertical movement cylinder 25 Bevel gear shaft 51 Hydraulic cylinder 52 Mold 54 Concave mold 55 Dogbone 56 Bulging

Claims (1)

[Claims] 1. A hot slab extracted from a heating furnace is continuously or intermittently fed, and has a portion parallel to the slab entry side and a portion parallel to the slab entrance side, which are provided opposite to each other in the slab width direction. The width of the press die is set according to the amount of slab width reduction, and then the width of the hot die slab is reduced to a predetermined width by moving the press die close to and away from each other. And a pair of restraint dies are arranged movably in the horizontal direction with the restraint surfaces facing each other above and below the slab, and the upper restraint die of the restraint dies is provided so as to be vertically movable. Width reduction press machine for hot slabs characterized by