JPS59224208A - Method and device for cutting slab - Google Patents

Abstract

PURPOSE:To enable cutting which does not cause any defect in a surface by constructing at least either of upper and lower cutters relatively movable in the direction of the transfer of a slab and parting said slab in its longitudinal direction, by a parting force in the slab transferring direction, at a stage where a thin wall part remains in the body material of said slab. CONSTITUTION:When a slab body material 1 which is continuously transferred in the direction of arrow A is cut off, an upper and a lower cutter 3, 9 are lowered and raised and brought closer to each other, and the slab body material 1 is constricted with conical recesses, corresponding to the conical sections of the cutters, being formed on the top and bottom surfaces, leaving a thin wall part 1' in the middle part of its thickness. During this time, the slab cutter is moved together with the slab body material 1 in the direction of A. Then, a separator cylinder 17 is operated and the lower cutter 9 is displaced in the A direction, thereby applying a parting force that severs the slab 1'' to be separated from the slab body material 1, to the thin wall part 1'. After that, both cutters 3, 9 are retracted in the mutually parting directions while the cylinder 17 is returned, restoring the cutters in their original positions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for hot cutting continuously cast slabs, particularly slabs.

In the conventional cutting method in which this type of slab cutting machine divides slabs with two lower facing blades like a forging press, the frictional resistance increases as the contact surface between the blade surface and the slab base material increases near the end of cutting. Requires a large amount of cutting force. In addition, normal shearing distorts the solidified structure in the continuously cast base material near the cut, which may appear as defects during rolling during the erosion process.

The present invention has been made to solve this problem, and unlike incision cutting in which the upper and lower cutters are brought closest to the final stage and cut the slab base material completely, The purpose of this method is to create a thin section with a reduced cross section by making the upper and lower cutting edges loose, and then tearing the slab base material apart using a saw in the longitudinal direction of the base material. That is, at the stage where the upper surface of the slab material is crushed to the extent that the frictional resistance between the cutter and the slab base material is not much larger than the deformation resistance force of the slab base material for forming the chevron shape, and the cross-sectional area of the slab base material is reduced. By applying tensile force in the longitudinal direction of the slab and dividing it, the amount of force is reduced compared to the method of completely pushing it out. Also, since the process of forming the mountain-shaped recesses is forging, the flow of the structure is good, and the plate thickness is reduced at the cut end. The structure in the L direction brings about good results, such as the internal structure of the solidification process having defects such as segregation inside the solidified shell, which is L-positively symmetrical and relatively wire, gathers in the center and is less likely to appear as surface defects during rolling. It was done with the intention of

The slab cutting method of the present invention uses a slab cutting machine A3 in which the upper and lower cutters operate in close proximity in a direction perpendicular to the slab base material, and the upper and lower cutters have a chevron-shaped cross section and are disposed facing each other, and the upper and lower cutters operate in close proximity. to form a chevron-shaped concave part on the old lower surface while leaving a thin wall part in the center of the slab base material, and -1- move at least one of the lower cutters relatively in the longitudinal direction of the slab base material.
The method is characterized in that the slab to be cut is separated from the slab fl IJ by cutting inside the lung.

In addition, the slab cutting device has an upper cutter J and a lower cutter each having a chevron-shaped cross section and are opposed to each other and operate in close proximity to the slab base material in a direction perpendicular to the slab base material, and the upper and lower cutters are relative to each other in the longitudinal direction of the slab base material. The invention is characterized in that it is equipped with a drive means that is operated to

Hereinafter, the present invention will be described as pull-up type down end up cup 1.
A preferred embodiment applied to a running machine V- will be described in detail with reference to the accompanying drawings. FIG. 1 shows a longitudinal sectional side view of a slab cutting machine according to an embodiment, and FIG. 2 shows a front view thereof.

A slab base material 1 (see Fig. 3) consisting of continuously cast pieces continuously pulled out from a continuous casting machine passes through a slab cutting machine 2 and moves along a pass line P in the direction of arrow A'? 1, that is, it moves continuously from the right to the left in FIG. For the purpose of explanation, first slab cutting machine 2
The configuration of is explained.

The upper cutter 3 is formed into an integral chevron cross-section, and the upper cutter frame 4
The upper blade frame 4 has upper blade frame lifting devices 5.5 on both sides thereof, and wheels 6.5 on both front and rear sides below the upper blade frame lifting device 5.5.
6 is mounted on a rail 8.8 on a base 7.7. In this way, the upper cutter 3 can be raised and lowered towards the slab base material 1 by means of the upper cutter frame lifting device 5.5 and can be moved synchronously by the slab base material 1 in the direction of its displacement by means of the wheels 6.
- The lower cutter 9 is formed in the same integral chevron cross-section as the upper cutter 3, is attached to the shear frame 10 which also serves as the lower cutter frame as described later, and is placed at a reference position facing the upper cutter 3, The column parts 11.11 on both sides of the fly 1110 are guided in the vertical direction by guide parts 12.12 of the upper blade frame 4. A main ram 14 attached to a shear frame platen 13 on the upper part of the shear frame 10 fits into a main cylinder 15 of the upper blade frame 4, and lifting cylinders 1G and 16 are provided on both sides of the main cylinder 15. The hydraulic actuation of these cylinders 15, 16 thus provides the height position of the shear frame 10 relative to the upper blade frame 4,
The lower cutter 9 moves up and down relative to the upper cutter 3.
．． 9 performs operations of approaching and separating from each other.

The lower cutter 9 is mounted on the shear frame 10 at right angles to the shear operating direction of the upper and lower cutters 3.9, that is, the slab base 1. ! l
The separator cylinder 17 is connected to a separator cylinder 17 provided in the shear frame 10 so as to be actuated in the longitudinal direction of the shear frame 10. In this way, the upper and lower cutters 3.9 can be moved in the aforementioned direction from their opposing reference positions and returned to their original positions by hydraulic operation of the leverator cylinder 17.

The method of the present invention is implemented by performing the following sequential operations in the above configuration example. Figure 3 (a) (b)
(c) OJ: and (d) indicate the positional relationship between the slab base material 1 and the upper and lower cutters 3.9 at each operating stage.

FIG. 3(A) shows the slab base material 1 in a running and waiting state, and the slab base material 1 continuously moves in the direction of the arrow Δ, that is, from the left to the right in each view of FIG. The lower cutter 3 and the lower cutter 9, each having a chevron-shaped cross-section, face each other and wait close to the slab base material 1 at the pass line height.

Figure 3 (b) shows the preformed state, and in response to a cutting command, the upper cutter 3 is lowered and the lower cutter 9 is raised to operate in close proximity, leaving a thin part 1' at the center of the thickness of the base material 1. A chevron-shaped recess corresponding to the chevron-shaped cross section of the cutter is formed on the lower surface to create a constricted state. The slab cutting 11fr machine 2 moves in the direction along with the slab material 1.

1. FIG. 3(c) shows the slab dividing state, and the separator cylinder 17 is operated from the state of FIG. 3(b), and in this example, the lower cutter 9 is moved from the position opposite to the upper cutter 3 to separate the slab base material 1.
Apply a force in the direction of transition A, and use that force as a parting force to separate the slab 1'' from the slab base material 1 at the thin wall portion 1'. The close state is maintained during this time and the slab cutter continues to transition in synchronization.

The above-mentioned cutting force is applied to the contact surface between the slab 1" to be cut and the chevron-shaped slope on that side of the lower knife 9, and the slab base material 1" - the knife 3.
A tensile force acts in the opposite direction on the contact surface with the chevron-shaped slope on the side A, and the tensile force A is applied to the reduced cross section of the slab base material, causing it to break.

Fig. 3 i2) shows the return state, in which the lower cutter 9 is lowered, the lower cutter 3 is raised, the separator cylinder 17 is rearwardly moved, the slab cut 1 m2 is returned, and the cut slab 1'' is carried out.

FIG. 4 shows an embodiment slightly different from FIGS. 1 to 3. In this embodiment, as shown in FIG. 4(a), the slab cutting machine 2
' is the upper cutting tool 3' of the main body, and the lower cutting tool 9' has a single-sided chevron cross-section, but it is an upper auxiliary cutting tool 3 that is staged on the downstream side in the slab transfer direction.
Together with A and the lower auxiliary blade 9△, it forms a chevron-shaped cross section. The upper auxiliary blade 3A and the lower auxiliary blade 9△ are attached to the bin 18 so as to be movable downstream from the upper blade 3' and the lower blade 9', respectively.
and 18', and are connected to separator cylinders 17' and 17'' as respective driving means.
The standby state and the preform state in FIG.
The steps are the same as in Figures (A) and (B), but the subsequent slab division is as shown in Figure 4 (D). ' and the lower cutter 9' are moved relatively downstream in the slab transfer direction to cut the slab 1'' from the slab base material 1 so as to lighten the thin part 1'. Blade 3A
The tensile separation is performed by moving either or both of the lower auxiliary blade 9A.

In these embodiments, the slab is moved forward and backward without being lifted, so that so-called "force jelly" does not occur. Further, in the embodiment shown in FIG. 3, the pull-up type up-cut shear 1r- is applied and the separator cylinder is provided on the lower cutter side, but the shear 11- may be closed by a down-cut shear, and the separator cylinder may be provided on the upper cutter side or on both sides as shown in FIG.

As described above, according to the present invention, the conventional slab +41
When the thin wall part 1' remains in the slab base material 1 after the complete push-off of U, it is separated in the longitudinal direction by the breaking force in the slab transport direction, so the amount of pressure deformation force is reduced compared to the case of complete push-off. In addition, the structure of the slab cut surface in the thickness direction is vertically symmetrical, and because it is forged, the structure changes smoothly, and defects such as center segregation of continuous cast materials concentrate in the center and are less likely to appear as surface defects during rolling. is obtained.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional side view of an example of a slab cutting machine that implements the method of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a diagram showing the positional relationship between the slab base material and the upper and lower cutters, and Fig. 3 ( A) shows its threading and waiting state, and Fig. 3 (opening) shows its preformed state.
FIG. 3(c) shows the slab in its divided state, and FIG. 3(d) shows its restored state. Fig. 4 (a) is a vertical cross-sectional side view of a slab cutting machine of a different embodiment, Fig. 4 (opening) is its threading and standby state, and Fig. 4 (c) is a preform state, Fig. 4 (D) shows the slab divided state, and Fig. 1 (E) shows the restored state. 1... Slab base material, 1'... Thin wall part, 1"... Slab to be cut, 2.2'.・・Slab cutting machine, 3.3′・
...Upper blade, 3Δ...Upper auxiliary blade, 4...Upper blade frame, 5...Upper blade frame lifting device, 6...Wheel, 7
...Base, 8...Rail, 9.9'...Lower blade, 9A...Lower auxiliary blade, 10...Shear frame, 1
DESCRIPTION OF SYMBOLS 1... Column part, 72... Guide part, 13... Seat frame platen, 14... Main ram, 15...
Main cylinder, 16... Lifting cylinder, 17.17'
, 17"...Separator cylinder, 18.18'...
・Pin, P...pass line, A...slab transition direction.

Claims (3)

[Claims] (1) In a slab cutting machine in which the upper and lower cutters operate close to each other at right angles to the slab base material, the upper and lower cutters have a chevron-shaped cross section and are placed opposite each other, and the close operation of the upper and lower cutters creates a thin wall in the center of the slab base material. Form four chevrons on the upper and lower surfaces, leaving at least one side of the upper and lower cutters relatively slab ffH.
A slab cutting method characterized by separating the slab to be cut from the slab base material by moving it in the longitudinal direction of J and separating it at the thin wall part. (2) It has an upper cutter and a lower cutter having opposing chevron-shaped cross sections that operate in close proximity to the slab base material in a direction perpendicular to the slab base material, and is provided with a driving means that relatively operates the upper and lower cutters in the longitudinal direction of the slab ff1IJ. A slab cutting device characterized by: (3) The upper and lower cutters should have a chevron-shaped cross section together with the assembled upper and lower auxiliary cutters, and the lower auxiliary cutter should have at least 61 sides aligned in the longitudinal direction of the slab base material. A patent claim characterized in that the slab to be cut can be separated from the slab base material by moving at least one of the upper and lower auxiliary blades to separate the slab from the slab base material by moving at least one of the upper and lower auxiliary blades. The method and apparatus according to scopes 1 and 2.