JPH0113965B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention is directed to a pair of V-shaped blades with opposing cutting edges that sandwich a material to be cut, such as a plate, a bar, or a molded material, in a direction perpendicular to the material to be cut. The present invention relates to a push-cutting device that advances from the ground and cuts the material by pushing it into the material to be cut.

[Prior art]

When cutting sheets, bars, molded materials, etc. of various metals such as steel and aluminum by shearing, the material to be cut is held in between and a pair of rectangular blades with their tips offset and facing each other are cut in a direction perpendicular to the material to be cut. Conventionally, a cutting device that cuts the material by moving the material in a cross-cutting manner has been commonly used. However, in such a cutting device, a cutting burr that recoils toward the cutting surface side is often generated at the cut ends of both cut materials separated by cutting, so when this is rolled by a rolling mill, The tip of the rolled product becomes wide or overlaps, resulting in loss, which has the disadvantage of lowering the yield of the product.

Therefore, conventionally, a V-shaped blade was provided instead of a rectangular blade,
A cutting device has been proposed and is widely used, which cuts by moving the blade edges facing each other. FIGS. 1a and 1b are a side view of the vicinity of the steel plate cutting section and a side view of the steel plate after cutting, shown for explaining the cutting operation of this type of cutting device. In the figure, a steel plate 1 shown as an example of a material to be cut is held on the machine body side by a holding member so as to be movable in the horizontal direction.
Above and below the steel plate 1, an upper blade 2 and a lower blade 3, which are formed in a V-shape, are arranged so as to be vertically movable with their cutting edges facing each other. Then, when the upper blade 2 and the lower blade 3 are simultaneously advanced toward the steel plate 1 using a hydraulic cylinder or the like, the blade edges are pushed into the steel plate 1, and as shown in FIG. As the horizontal component force due to the wedge action of 2 and 3 overcomes the stress in the remaining portion of the steel material 1, the steel material 1 is torn and cut in the direction of arrow A. In this case, the cut end of the steel plate 1 is formed into a tapered shape according to the shape of the blades 2 and 3, and a cutting burr 1a is generated at the center of the plate thickness. It is possible to reduce the occurrence of wide edges and the occurrence of flaws caused by cutting burrs, and the yield of products can be improved. Further, productivity is improved since a separate step of forming the cut end into a tapered shape is not required, and the tapering makes it easier to insert the cut end into a rolling mill.

However, cutting work using such a device is good if the material to be cut is relatively non-stick and has low stress, but it is not suitable for cutting sticky materials such as steel at a temperature of about 1000℃. The blades must be pushed in until the edges of the blades 2 and 3 are on the verge of completely colliding with each other, so if they accidentally collide, the edges will wear out and become deformed, causing the blades 2 and 3 to collide.
3, and as a result, the cutting work efficiency was reduced. Another attempt has been made to stop the blades 2 and 3 just before the blade edges collide with each other and apply a tensile force to the steel material 1 in the direction of arrow A using mechanical means to tear it apart, but the equipment and control device are complicated. It had the disadvantage of becoming.

[Summary of the invention]

The present invention has been made in view of the above points, and includes a pair of blades that sandwich a material to be cut and have opposing cutting edges. By providing a pressing member that presses against the surface, and configuring this pressing member with an anti-friction member that has the function of reducing the sliding resistance between the material to be cut and the pressing member in the cutting direction of the material to be cut, the blade The object of the present invention is to provide a push-cutting device that can completely cut and separate a material to be cut by a smooth pushing operation without causing wear or breakage of the cutter. Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

2 to 5 show an embodiment of the push cutting device according to the present invention, FIG. 2 is a side view of the blade and the steel material to be cut by the blade, and FIG. 3 is a plan view from B in FIG. 2. , Figure 4 is an enlarged side view of the cutting edge, Figures 5 a to d
FIG. 2 is a side view of a blade and a steel plate for explaining a cutting operation. A steel plate 11 shown as an example of a material to be cut in the figure is held by a holding member on the machine body so as to be movable horizontally in two places on the left and right, which are far away from the cutting point. An upper blade 12 and a lower blade 13 are respectively provided. The upper blade 12 is formed in a V-shape with inclined surfaces 12a and 12b, and the lower blade 13 is also formed in a V-shape with inclined surfaces 13a and 13b. A chain line 14 is a cutting edge advancing direction line that is perpendicular to the plane of the steel plate 11, and the upper blade 12 and the lower blade 13 are driven by a driving device such as a hydraulic cylinder (not shown) to move the cutting edge 1.
2c and 13c are configured to move up and down along this cutting edge advancing direction line 14. A pressing surface 12d parallel to the plane of the steel plate 11 is formed at the base of one inclined surface 12b of the upper blade 12, and a lower pressing surface 12d is formed on the asymmetric side of the inclined surface 12b of the upper blade 12 with respect to the steel material 11. At the base of the inclined surface 13b of the blade 13, there is also a pressing surface 13d parallel to the plane of the steel plate 11.
is formed. And both pressing surfaces 12
d and 13d are provided with pressing members 15 that are interposed between the pressing surfaces 12d and 13d and the steel material 11 and press the steel material 11 when the blades 12 and 13 advance. The pressing member 15 has the function of pressing the steel material 11 at the final stage of cutting the steel material 11, and the function of reducing the sliding resistance between the pressing member 15 and the steel material 11 in the cutting direction of the steel material 11 (direction of arrow A). Therefore, in this embodiment, the pressing member 15 is composed of a plurality of rollers shown as an example of a sliding friction reducing member. This roller 15 has pressing surfaces 12d and 13d.
They are rotatably supported by protrusions 16 fixed to the protrusions 16 and are arranged in a staggered manner.
The positions of the pressing surfaces 12d and 13d and the diameter of the rollers 15 are set so that the distance h from the pressing surfaces 12d and 13d is slightly smaller than 1/2 of the thickness of the steel material 11.

The operation of cutting a steel plate by the push cutting device configured as above will be explained based on FIG. 5. As shown in FIG. 5a, the upper and lower blades 12 and 13 are positioned above and below the steel plate 11, which is supported on the aircraft body so that it can move slightly in the horizontal and vertical directions, and the cutting edges 12c and 13c are When the cutting edge is moved along the cutting edge advancing direction line 14, the cutting edge 12c, 13
c is pushed into the steel plate 11, and the steel plate 11 is cut from the top and bottom. Then, when the blades 12 and 13 are pushed to the position shown in FIG. 5b, the circumferential surface of the roller 15 is
Abuts on the surface of 1. When the blades 12 and 13 are further advanced, a component of the pushing force in the horizontal direction by the inclined surfaces 12a and 13a acts on the steel plate 11, and at the same time, a component force in the cutting edge advancing direction by the pressing surfaces 12d and 13d via the rollers 15 is applied to the steel plate 11. Since pressing forces act, these forces overcome the stress of the steel plate 11, resulting in
The steel plate 11 is offset in the cutting edge advancing direction and the rollers 15
The steel plate 11 is cut by rolling and sliding sideways in the cutting direction of the steel plate 11 so as to be torn off. FIG. 5c shows the cut state. Then, the cutting is completed by withdrawing the blades 12, 13 from the steel plate 11 as shown in FIG. 5d.

During the above cutting operation, the rollers 15 touch the steel plate 11.
At the final stage of cutting after coming into contact with the surface of
A roller 15 is interposed between 3d and the surface of the steel plate 11, and the roller 15 is rolled while moving in the horizontal direction, so the resistance at this time is the rolling friction of the roller 15, and its value is This is significantly reduced compared to sliding between planes.

FIG. 6 is a side view of an upper blade and a steel plate showing another embodiment of the present invention, and the shape of the upper blade 12 and the structure and arrangement of the rollers 15 provided on the pressing surface 12d are exactly the same as in the previous embodiment. However, in this embodiment, the bracket 1 is placed on the steel material 11 side of the roller 15.
A flat plate-like backing plate 19 supported by a compression coil spring 18 is inserted in 7, and these members constitute a pressing member for the steel material 11.
The backing plate 19 is urged toward the inclined surface 12b by a compression coil spring 18. Although illustration of the lower blade 13 is omitted, it has the same configuration as the upper blade 12 in this embodiment. By configuring like this,
When the blades 12 and 13 advance and the backing plate 19 comes into contact with the surface of the steel plate 11, and then the blades 12 and 13 are further advanced, the steel plate 11 starts to slide sideways in the cutting direction due to separation of the steel plate 11 as described above. In this case, as the steel plate 11 moves, the backing plate 19 moves to the roller 1.
5 and moves away from the inclined surface 12b while compressing the compression coil spring 18, and the steel plate 11 and the backing plate 19 do not move relative to each other. In this case, since the steel plate 11 and the backing plate 19 are in surface contact, the large load caused by the pushing of the blades 12 and 13 can be sufficiently supported, and there is no problem even when the material to be cut is a soft material. Even if there is scale or the like on the surface of the material to be cut or the material to be cut is at a high temperature, the rollers 15 will not get dirty or will not be damaged by heating. In addition, the patch plate 19
After separating from the steel plate 11, it returns to the illustrated position by the elastic force of the compression coil spring 18.

FIG. 7 is a side view of an upper blade and a steel plate showing another embodiment of the present invention, and in this embodiment, the blades 12 and 13 have pressing surfaces 12 and
d and 13d are not formed. And upper blade 12
A compression plate 20 as a pressing member formed in a fan shape is rotatably supported on the side surface of the bracket 21, and a compression coil spring 22 interposed between the bracket 21 and the pressing plate 20 is rotatably supported.
A rotational force is applied to the upper blade 12 side.
By doing this, the circular surface of the backing plate 20 is aligned with the steel plate 1.
When the steel plate 11 comes into contact with the surface of the steel plate 1 and starts to move horizontally due to separation, the backing plate 20 rotates, so the resistance becomes rolling friction due to the rotation of the backing plate 20, and its value is reduced. Note that after the backing plate 20 is separated from the steel plate 11, it returns to the illustrated position by the elastic force of the compression coil spring 22. Further, in the case of this embodiment, the caul plate 20 does not necessarily have to be rotatably supported, and even if it is fixed to the upper blade 12, the caul plate 20 and the steel plate 11 are in line contact, and there is an anti-friction effect. In addition, in the case of this embodiment, the lower blade 13 (not shown)
It also has the same configuration as the upper blade 12.

In the embodiments shown in FIGS. 2 to 6, the rollers 15 are supported by the projecting pieces 16 and arranged in a staggered manner, but one or more long rollers may be used. A floating roller or roller without a support member may be used. Furthermore, in each of the above embodiments, examples were shown in which the present invention was applied to the upper blade and the lower blade.
Either one may be the same blade as the conventional blade as shown in FIG. Further, in each of the above embodiments, both inclined surfaces 12a, 12b and 13 of the blades 12, 13
Although the example in which the inclination angles of a and 13b are the same and symmetrical with respect to the cutting edge advancing direction line is shown, the pressing surface 12
It is more effective if the angle of inclination of the inclined surfaces 12a, 13a on the side where d, 13d are provided is made smaller than the angle of inclination of the other inclined surfaces 12a, 13a. In other words, by doing this, the thickness of the entire blade edge can be reduced to the minimum thickness required to maintain strength, making it easier to push into the material to be cut and ensuring the strength of the blade. Since the angle of inclination of the inclined surface on the side from which the material to be cut is separated after contacting the material to be cut is large, separation is easily performed. In each of the above embodiments, a steel plate is used as an example of the material to be cut, but the material may be any material such as aluminum or brass, and the cutting material is not limited to a plate material, but may be a bar material, a molded material, or the like.

〔Effect of the invention〕

As is clear from the above description, in the push-cutting device according to the present invention, a pressing member is provided at the base of the sloped surface on one side of at least one of the pair of blades that sandwich the material to be cut and have their cutting edges facing each other. As a result, at the final stage of cutting when the pressing member comes into contact with the material to be cut, a force is applied to the material to be cut in the horizontal direction due to the wedge action of the inclined surface of the cutting edge, and a force is applied to the material to be separated in the horizontal direction due to the pressing surface. The material to be cut can be separated reliably with an extremely simple configuration, and the final cut part, which becomes sticky at the end of cutting and is difficult to separate, can be completely separated, especially when the material is sticky. In addition, since the cutting is completed before the blade edges collide with each other, there is no deformation or breakage of the blade, and durability is improved. Furthermore, by forming the pressing member with a friction-reducing member such as a roller, when the material to be cut and separated at the end of cutting moves in the horizontal direction, which is the longitudinal direction of the material, a large load is applied due to the pushing force of the blade. Even if the pressure member acts between the pressing member and the material to be cut, the sliding resistance between the two is reduced and the material to be cut moves extremely smoothly, allowing reliable cutting and separation without the need for re-cutting. be able to.

[Brief explanation of drawings]

FIGS. 1a and 1b are side views of the vicinity of the steel plate cutting section and side views of the steel plate after cutting, shown to explain the cutting operation by a conventional push-cutting device, and FIGS. 2 to 7 are side views of the steel plate after cutting, and FIGS. An embodiment of the cutting device is shown, and FIG. 2 is a side view of the blade and the steel material to be cut by the blade, FIG. 3 is a plan view from B in FIG. 2, and FIG. 4 is an enlarged side view of the cutting edge. 5A to 5D are side views of the blade and the steel plate for explaining the cutting operation, and FIGS. 6 and 7 are side views of the upper blade and the material to be cut, respectively, showing other embodiments of the present invention. be. 11... Steel plate, 12... Upper blade, 13... Lower blade,
12a, 12b, 13a, 13b...slanted surface, 1
4...Blade tip advancing direction line, 15...Roller, 19...
Caustic plate, 20...Painting plate.

Claims (1)

[Claims] 1. In a push-cutting device in which a pair of V-shaped blades that sandwich a workpiece to be cut and have their cutting edges facing each other are advanced from a direction perpendicular to the workpiece and are pushed into the workpiece to cut the workpiece, one of the pair of V-shape blades is A pressing member that is pressed against the material to be cut at the final stage of cutting is provided at the base of the sloped surface on one side of at least one of the blades. A push-cutting device characterized by comprising an anti-friction member that reduces sliding resistance.