JPH0131376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a push-cutting device that advances a tapered blade from a direction perpendicular to the surface of a metal material or the like to push and cut the material.

[Prior art]

For example, when cutting various metal materials such as cast steel slabs obtained by continuous casting or aluminum molding materials by shearing, a pair of rectangular blades with their tips offset above and below the material to be cut are placed against the material to be cut. Conventionally, cutting devices have been commonly used that cut by moving the material in a perpendicular direction in a manner that they pass each other. This type of cutting device is superior to gas cutting machines, saw blade cutting machines, etc. in that it takes less time to cut and has a higher material yield, but there are problems with the shape of the cut end. This had a particularly serious effect on those that were subjected to rolling processing after cutting.

1A to 1F are explanatory diagrams of this kind of conventional cutting device, in which FIG. 1A is a schematic side view of the material to be cut and the blade before cutting, FIG. 1 is a side view of the cut end, FIG. d is a side view showing the state during rolling, FIG. e is a plan view of the rolled end, and FIG. f is a perspective view. In Fig. a, an upper blade 2 and a lower blade 3, each having a rectangular cross section, are installed on both upper and lower sides of a continuously cast slab slab 1 (hereinafter referred to as slab 1) shown as an example of a material to be cut. They are arranged with a phase shift in the longitudinal direction, and when these double blades 2 and 3 are entered into the slab 1 in a direction perpendicular to the front and back surfaces of the slab 1, the slab 1 will be cut out as shown in Figure 1b. It is cut as shown by symbols 1A and 1B. In this case, burrs shown by reference numeral 1a in FIG. c occur at the cut ends of the slabs 1A and 1B due to the action of shearing. Slabs 1A and 1B having such cut ends
is rolled by the upper and lower rolling rollers 4 and 5 as shown in Figure d, the burr 1a is rolled by the rolling rollers 4 and 5.
When the burr 1a collides with and damages the burr 5, or the burr 1a is folded back as shown in FIG. In addition, due to the cut surface being perpendicular to the axis of the slab 1, the rolling rollers 4 and 5 may not be caught properly, and due to uneven deformation during rolling,
As shown in Figure f, at the end of the rolled slab 1C,
A bump-like defective portion 1c occurs. Moreover, these flaws 1b and defective parts 1c cannot be used in the product and must be completely discarded, resulting in poor yield.

Further, in this type of conventional cutting device, there was also a problem in terms of material movement during cutting. That is, FIG. 2a is a schematic side view of the up-cut type cutting device, and in this case, the lower blade 3 rises to perform cutting, but the slab 1, which was at the position shown by the chain line before cutting, is cut individually. Solid line 1A,
It is lifted by δ _L and δ _R to the position shown in 1B.
Therefore, undesirable phenomena occur in which the slabs 1A and 1B are bent or dropped after cutting is completed. FIG. 2b is a schematic side view of a down-and-up cut type cutting device, in which the upper blade 2 descends to the surface of the slab 1 and the lower blade rises to perform cutting. The slab on the lower blade 3 side is lifted by δ _L from the position shown by the chain line 1 to the position shown by the solid line 1A, which is also undesirable. Furthermore, FIG. 2c is a schematic side view of an up-and-down cut type cutting device, in which the lower blade 3 rises to the back surface of the slab 1, and the upper blade 2 descends to cut it. At this time, the slab on the upper blade 2 side is pushed down by δ _R from the position shown by the chain line 1 to the position shown by the solid line 1B. Therefore, it is necessary to have a structure in which the supporting member of the slab 1B can sink, which makes the structure complicated. In addition, in Fig. 2 d, after cutting, both slabs move from the position indicated by chain line 1 to solid lines 1A and 1B.
An example is shown in which the dimensions δ _L and δ _R for moving to the position indicated by are minimized, but even in this case, lifting and pushing down by about half the thickness of the slab 1 is unavoidable.

As described above, the rectangular blade type cutting device has particular problems in two points: the shape of the cut end of the material and the movement of the material, so a push cutting device has been proposed to eliminate these drawbacks. ing. This cuts the material by moving an upper blade and a lower blade formed in a tapered shape such as a V-shape from both the upper and lower sides of the material in the same direction of travel perpendicular to the material surface, and the material is cut at the center of its thickness. Since the material is torn in the longitudinal direction by bringing the upper and lower blades close together to the extent that their tips almost touch each other, the material does not move and burrs do not occur at the cut end.

However, in conventional push-cutting devices of this type, the upper and lower blades are driven separately, making it difficult to control the position relative to the pass line and the speed of both the upper and lower blades, resulting in a complicated structure. It had the disadvantage that it could not be cut properly and would flop.

[Summary of the idea]

The present invention was developed in view of the above points, and includes two sets of cutting blades each having a tapered cross-section on both sides of the material to be cut, and one set of cutting blades on the upper and lower sides and on the left and right sides. The blades are connected by bendable links on both sides of the material to be cut, the bending part of each link is pivotally connected to the other set of cutting blades, and the working end is connected to this pivoting part. By configuring both cutting blades to advance and retreat synchronously with respect to the axis of the material to be cut through a set of cutting blades,
To provide a push-cutting device that has a simple configuration, does not require position control or speed control, can cut a material with a tapered cutting blade that has a good cutting edge shape, and does not move the material. Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

3 to 5 show an embodiment of the push cutting device according to the present invention, FIG. 3 is a plan view thereof, FIG. 4 is a front view thereof, and FIG. 5 is a sectional view along AA of FIG. 4. . This embodiment shows an example in which the present invention is used for cutting a continuously cast slab, and a push-cutting device 11 is installed along a rail 13 laid on the floor surface in the running path of a continuously cast slab slab 12 having a square cross section. Tsute wheel 1
By rolling the slab 4, it moves in the same direction as the conveyance direction of the slab 12 in synchronization with the traveling speed of the slab 12, and cuts the slab 12 while running. A frame 15 with wheels 14 pivotally mounted on the lower surface
is formed into a substantially cross shape when viewed from the front, and has an opening 15a extending upward and downward, and an opening 15b extending forward and backward, and the slab 12 has the center of the opening 15b on the near side in FIG. It is sent out towards the spine of the paper. 16 is a hydraulic cylinder as a driving device fixed to the left and right end faces of the frame 15, and moves both piston rods 17 forward in synchronization;
It is configured to move backwards. On the other hand, slab 1
2, a guide 15c is formed by cutting the edge of the opening 15b into a U-shape, and this guide 15c has a pair of upper and lower cutting blades 18, 19. They are slidably fitted. The cutting blades 18 and 19 are rectangular in plan view and have arms 18a and 19a that protrude left and right.
b, 19b, and a cutting tool 18c formed in the shape of a tapered four-sided pyramid protruding from the surface on the side of the slab 12,
19c, and the tool rest 18b,
Guide plates 18d and 19d having an L-shaped cross section and sliding along the guide 15c are fixed to the four corners of the guide 19b. The cutting blades 18 and 19 are the cutter 1.
The cutting edges of the slabs 8b and 19b are supported so as to move forward and backward in a vertical plane perpendicular to the axis of the slab 12. On the other hand, a pair of left and right cutting blades 20 and 21 are connected to the working ends of the piston rod 17, which moves forward and backward with the hydraulic pressure of the left and right hydraulic cylinders 16, respectively. Each of the cutting blades 20, 21 includes a tool rest 20a, 21a which is formed into a T-shape in plan view and into which the threaded end portion of the piston rod 17 is screwed, and a blade 20b, 21b which is formed into a tapered quadrangular pyramid shape.
The tool rests 20a and 21a are integrally formed with the tool rests 20a and 21a.
is a guide plate 20 with an L-shaped cross section fixed to the four corners.
d and 21d are in sliding contact with the opening 15b of the frame 15. The cutting blades 20 and 21 are configured such that the cutting edges of the blades 20b and 21b move back and forth in a horizontal plane perpendicular to the axis of the slab 12 toward the axis. The cutting blades 18 and 19 and the cutting blades 20 and 21 are supported so as to be able to advance and retreat vertically and horizontally in this way.
are connected to each other by a bendable link 22. That is, the tool rest 20 of the cutting blades 20, 21
a, 21a, each pair of upper links 23 and lower links 24 constituting the links 22 are overlapped and rotatably connected by pins 25, and the pair of upper links 23 extend upward. It is pivotally connected to the arm 18a of the cutting blade 18 with a pin 26. Further, the pair of lower arms 24 extend downward and are pivotally connected to the arms 19a of the cutting blade 19 by pins 27. Note that the upper link 23 and the lower link 24 are
In the retracted position of the piston rods 17 shown in the figure, they form approximately 120 degrees from each other, and the piston rods 17
As the piston rod 17 moves forward, the piston rod 17 is bent until this angle reaches approximately 60°, and the forward movement of the piston rod 17 is stopped. When the left and right piston rods 17 advance and retreat in synchronization, the left and right cutting blades 20 and 21 directly connected to the piston rods 17
The cutting blades 20, 21 move forward and backward in synchronization, and the cutting blades 20, 21
The upper and lower cutting blades 1 are connected by a link 22.
8 and 19 are configured to move forward and backward in synchronization. In this case, the left and right cutting blades 20, 21 move forward at a constant speed and move forward at a constant speed throughout the movement of the piston rod 17, but the upper and lower cutting blades 18, 1
9, the cutting blades 20, 21 are cut in the first half of the movement of the piston rod 17 due to the relationship of the bending angle of the link 22.
In the latter half of the movement of the piston rod 17, it becomes faster than the cutting blades 20 and 21, and the average speed, that is, the stroke, becomes the same overall, and both stop just before reaching the axis of the slab 12.

The operation of the push cutting device configured as above will be explained. Slab 12 continuously cast and sent out
is fed into the frame 15 of the push cutting device 11, and is moved to the rail 13 in synchronization with the conveyance speed of the slab 12.
The cutting is carried out by the push-cutting device 11 running above, but at this time, the left and right hydraulic cylinders 16 operate simultaneously, the piston rod 17 moves forward from the position shown, and the left and right cutting blades 2 fixed at the working ends of the piston rod 17 move forward from the position shown in the figure.
0 and 21 move forward at the same speed with each other, and at the same speed from the beginning to the end of the movement of the piston rod 17. In addition, the upper and lower cutting blades 18 and 19, which are connected to the cutting blades 20 and 21 by a link 22, move forward later than the cutting blades 20 and 21 in the first half of the stroke;
In the latter half of the stroke, the speed increases and catches up, and slab 1
The cutting blades 20 and 21 stop at the same time just before reaching the axis of the cutting blades 20 and 21.

That is, the cutting blades 18, 19, 20, and 21, which were in the solid line position in FIG. 4.
When the cutting edges reach the position indicated by the chain line on the verge of contact, the hydraulic cylinder 16 stops and all the cutting blades 18, 1
9, 20, and 21 stop at the same time. During this time, the slab 12 is cut by the pushing of the cutting blades 18, 19, 20, 21, and just before the cutting edges come into contact, the slab 12 is moved in the axial direction by the wedge action caused by the tapering of the cutting blades 18, 19, 20, 21. torn apart. After cutting, the piston rod 17 of the hydraulic cylinder 16 retreats, and the cutting blades 18, 19, 20, 21
simultaneously retreat from the slab 12.

The slab 12 cut in the above manner is
As shown in the perspective view in FIG.
Even if the material is rolled by rolling rollers 4 and 5 as shown in FIG. 1D, no flaws 1b as shown in FIG. 1E occur. In addition, since the cut end 12a is inclined, even when it is rolled, a bump-like defective part 1c as shown in FIG. 1f does not occur.

Furthermore, by moving the upper and lower cutting blades 18 and 19 and the left and right cutting blades 20 and 21 forward in synchronization, the upper and lower or left and right cutting edges are simultaneously cut into the slab.
2, the slab 12 will not be lifted, pushed up, or moved laterally. In this case, the cutting blade 18,1
The speed control of the hydraulic cylinders 9, 20, and 21 is simply a control to synchronize both hydraulic cylinders 16, so it is easy to control and does not require a complicated control device.

In this embodiment, the hydraulic cylinder 16 is used as an example of the drive device for bending and extending the links 22, but an air cylinder may also be used. Alternatively, a motor and a gear device may be used to synchronously bend and extend both links 22. It's okay. Furthermore, although this embodiment shows an example in which the present invention is used as a running type cutting device, it is of course possible to apply the present invention to a fixed type cutting device.

[Effect of idea]

As is clear from the above description, in the push-cutting device according to the present invention, one set of cutting blades each having a tapered cross-sectional shape on both sides of the material to be cut is arranged, and one A drive system in which a set of cutting blades are connected by bendable links on both sides of the material to be cut, the bending part of each link is pivotally connected to the other set of cutting blades, and the working end is connected to this pivoting part. By configuring the device to move both cutting blades forward and backward with respect to the axis of the material to be cut in synchronization through two sets of cutting blades, defects such as burrs on the cut end can be avoided due to the characteristic of cutting with tapered cutting blades. Since this does not occur and the cut end becomes tapered, cutting loss is reduced, and especially when this is rolled, loss is significantly reduced and yield is improved. In addition, the cutting edges of the upper, lower, left and right cutting blades contact the material to be cut at the same time.
Since the material to be cut is not lifted up, pushed down, or moved laterally,
The correct cutting shape can always be obtained, reducing losses, and there is no need to provide special material support devices or complicated speed control devices, simplifying the structure and reducing equipment costs.

[Brief explanation of the drawing]

Figures 1 a to f and Figures 2 a to d are explanatory diagrams of conventional push-cutting devices and cutting methods, and Figure 1 a is an overview showing the workpiece and rectangular shape before cutting. Side view, Fig. 1b; Schematic side view, also shown in the state after cutting; Fig. 1c, a side view of the cut section; Fig. 1d, a side view showing the cut end in a state during rolling; Fig. 1e; FIG. 1(f) is a plan view of the cut end showing the area where the baldness defect has occurred, FIG. Figure 2b is a schematic side view of the down-and-up cut type cutting device, Figure 2c
2 is a schematic side view of an up-and-down cut type cutting device, FIG. 2d is a schematic side view of a cutting device that minimizes movement of material, and FIGS. 3 to 7 are implementations of a push-cutting device according to the present invention. An example is shown, and Fig. 3 is a plan view thereof, Fig. 4 is a front view thereof, and Fig. 5 is a
FIG. 6 is an explanatory diagram of the cutting operation, and FIG. 7 is a perspective view of the cut end. 11... Push cutting device, 12... Slab, 16...
...Hydraulic cylinder, 17...Piston rod, 1
8, 19, 20, 21... Cutting blade, 22... Link, 23... Upper link, 24... Lower link,
25, 26, 27...pin.

Claims (1)

[Scope of utility model registration request] Top and bottom blades with tapered cross sections are disposed on both the upper and lower sides and the left and right sides of the material to be cut, and are supported so that the cutting edge can reciprocate toward the axis in a plane that is substantially perpendicular to the axis of the material to be cut. , one set of cutting blades on each side, and one set of cutting blades formed to be bendable
A pair of links each connecting a set of cutting blades and a material to be cut on both sides and having a bending part pivotally connected to the other set of cutting blades, and a working end connected to each cutting blade on the side to which the bending part is pivoted. and a pair of drive devices for moving these cutting blades and the other cutting blade synchronously forward and backward with respect to the axis of the workpiece directly and through the bending and stretching of the link.