JPH05131319A - Cutting device for hollow member - Google Patents

Abstract

PURPOSE:To always maintain the cutting angle of a shearing blade constant by providing such an arrangement that a pair of punches which are moved back and force in their respective directions orthogonal to each other, shearing blades formed on the front end parts of the punches are used to successively shear the wall part of a hollow member along their respective operating direction, and chips are pushed out from the hollow member by the shearing blades. CONSTITUTION:During shearing of a hollow member 13 having a square or rectangular cross-sectional shape, shearing in two directions is carried out by shearing blades 26, 27 provided on a pair of punches 20, 21 which are moved back and forth in directions orthogonal to each other. That is, the punches are moved back and force in directions perpendicular to on two adjacent outer surfaces of the hollow member 13 so that the shearing blades provided on the punches outward shear the wall parts of the hollow member along the advance directions of the punches. Accordingly, since the punches cuts the wall parts opposite to each other, the hollow member may be completely cut through two process steps. In this case, the relative angles between the shearing blades and the wall parts to be cut thereby do not vary, and further, chips may be removed outside of the hollow member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for shearing a hollow member such as a square pipe having a square cross section such as a square or a rectangle.

[0002]

2. Description of the Related Art When cutting a hollow member of this kind, a so-called cutting device such as a metal saw has a problem that it is noisy and takes a long time to cut, and a gas cutter or a laser cutter has a problem. However, there are inconveniences such as expensive equipment. On the other hand, a device for shearing using a press or the like has advantages such as short working time and low equipment cost, and in this respect, it can be said that it is an excellent cutting device. However, when shearing a hollow member having a rectangular cross section, chips may remain inside the hollow member depending on the shape of the cutting edge, and the chips may enter between the cutting edge and the shearing surface to hinder cutting.

Conventionally, an apparatus aiming at eliminating such inconvenience has been proposed in Japanese Utility Model Laid-Open No. 56-38718. FIG. 9 schematically shows the device described in that publication, in which a protrusion 2 is formed at the center of the tip of the blade 1, and the movement of the blade 1 is continued at the left and right sides. Over 45 ° and 90 ° to the direction
A cutting edge 3 having an angle of less than is formed. This cutlery 1
Is advanced in a diagonal direction with respect to the hollow member 4 having a rectangular cross section as an object to be cut, is first inserted into the corner, and then the side wall is sheared by the cutting blade 3. When the side wall portion is sheared in this manner, the chips are pushed outward by setting the angle of the cutting blade 3 to the above-mentioned angle, so that the chips are separated between the cutting blade 3 and the sheared portion. It is not pinched in and is therefore not hindered by shearing.

[0004]

However, in the conventional device described above, when the protrusion 2 at the tip of the blade 1 is inserted into the hollow member 4, the portion corresponding to the protrusion 2 may be punched out. Since the resulting chips remain inside the hollow member 4, they are sandwiched between the cutting blade 3 and the sheared portion at the final stage of the cutting process to inhibit shearing, and the cutting surface is peeled off. There was a problem that a good cut surface could not be obtained.

Further, as is known from FIG. 9, the angle of the cutting portion with respect to the cutting blade 3, that is, the cutting angle, is greatly different between the upper side wall portion 4a and the lower side wall portion 4b in FIG.
As a result, there is a problem that the cut surface of the lower side wall portion 4b becomes rough.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cutting device capable of obtaining a good cutting surface.

[0007]

In order to achieve the above object, the present invention provides a die for gripping and fixing a hollow member having a rectangular cross section from the outside of its four faces, and outer surfaces of the hollow member which are adjacent to each other. A pair of punches that move back and forth in a direction perpendicular to the above, and a pair of wall parts along the direction parallel to the moving direction of each punch among the hollow members gripped by the die are pressed diagonally from the inner surface to the outer surface direction. And a pair of shearing blades formed at the tip of each punch so as to shear.

[0008]

The cutting device of the present invention is intended for a hollow member having a square or rectangular cross section, and performs shearing from two directions by shearing blades provided on a pair of punches that move back and forth in directions intersecting with each other. .. That is, each punch moves back and forth in a direction perpendicular to the outer surfaces of the hollow members adjacent to each other, and a pair of shear blades provided on each punch shears the wall portion along the forward direction of the punch toward the outside thereof. To do. Therefore, since each punch cuts the wall part facing each other, the hollow member can be completely cut in two steps, in which case the relative angle between each shear blade and the wall part cut by it changes. In addition, the chips are removed outside the hollow member and do not hinder the cutting operation.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a side view thereof, in which a main body portion 10 is mainly composed of a base portion 11 and a support frame portion 12 erected on the upper surface thereof. A through hole is formed in the central portion of the support frame portion 12 for penetrating the pipe 13 having a rectangular cross section, which is an object to be cut, almost horizontally, and the support frame is provided in an upper portion of the through hole. A generally rectangular chevron-shaped upper die 14 attached to the portion 12 is arranged. The upper die 14 is for holding the pipe 13 by pressing the two surfaces of the pipe 13 from the lower side, and is installed with the left and right wall portions extending obliquely downward at an angle of 45 °. ing. A lower die 15 is arranged so as to face the upper die 14. This lower die 15 is 90 °
It is a member having a V-shaped cross section set to the opening angle of, and holds the pipe 13 by sandwiching the pipe 13 with the upper die 14.

The lower die 15 is attached to the upper end of a slider 16 which is held by a support frame 12 so as to be movable up and down, and the slider 16 is constantly pressed downward by a spring 17. On the other hand, on the lower side of the slider 16, a wedge member 18 which is moved along the upper surface of the base portion 11 is arranged.
The slider 16 is pushed up by pushing the slider 16 downward.

The upper surface of the support frame 12 is an inclined surface which is substantially parallel to the outer surface of the pipe 13 held by the dies 14 and 15. The inclined surfaces of the support holes 12 are guide holes 22 and 23 into which the punches 20 and 21 are inserted. Are formed. The shapes of the guide holes 22 and 23 are the same as the cross-sectional shapes of the punches 20 and 21, and are convex as shown in FIG. Further, the punches 20 and 21 are a pair of two, and are attached to the rams 24 and 25, respectively, in a direction perpendicular to the inclined surface of the upper end of the support frame portion 12, that is, the pipe 13 held by the dies 14 and 15. Is to be moved back and forth in a direction perpendicular to each of the two surfaces adjacent to each other, and shearing blades 26 and 27 are formed at the tips thereof.

The shapes of these shearing blades 26 and 27 are shown in FIG.
And as shown in FIG. 5, each pair of shear blades 26,
The interval of 27 is set to be slightly smaller than the interval of the side wall portions of the pipe 13 which face each other, and the cut angle is 90.
The shape is slanted backward and inclined outward so that the positive angle is smaller than °. Furthermore, each shear blade 26, 27
The rear end is curved to round the chips. This is because chips are easily discharged from the discharge pot 28, and the discharge pot 28 is formed at the center of the slider 16 so as to penetrate from the upper end to the lower end.

When the pipe 13 is cut by the above-mentioned cutting device, the punches 20 and 21 are operated alternately in order to avoid mutual interference. FIG. 3 shows the state where the punch 20 on the right side in FIG. 1 is advanced, and the shearing blades 26 formed at the tip of the punch 20 bite into both ends of a plane perpendicular to the moving direction. , The side wall portion along the direction parallel to the moving direction is sheared in cooperation with the dice 14 and 15. In that case, since the shear blade 26 is inclined so as to spread outward, the chips are pushed out of the pipe 13. Further, the chips are cut by the shearing blade 26 as the shearing progresses.
It is rounded at the rear end to facilitate discharge from the discharge pot 28. FIG. 4 is a cross-sectional view of the pipe 13 in which the punch 20 is advanced to complete the cutting of the pair of side wall portions 13a, 13a, and the other pair of hatched side wall portions 13b, 13b remain uncut. ing.

After the punch 20 is retracted and the other punch 21 is advanced, as shown in FIG. 5, the shearing blade 27 formed at the tip of the punch 21 causes the uncut side wall portion 13b,
13b is sheared in cooperation with the dies 14 and 15. Also in that case, the chips are pushed out of the pipe 13 and rounded at the rear end of the shear blade 27.

In order to take out the cut pipe 13, the wedge member 18 is retracted from the lower side of the slider 16 by the cylinder 19 so as to be provided on the slider 16 and its upper end, as shown in FIG. The lower die 15 is lowered by the spring 17, and the upper and lower dies 1
The grip of the pipe 13 by 4, 15 is released.

As described above, the shearing blades 26, 27 are provided with side wall portions 13a, 13b along a direction parallel to their moving directions.
Is sheared in cooperation with the dies 14 and 15, so that the respective cutting angles are always constant and the shearing blades 26 and 27 are
And the chips do not remain inside the pipe 13. Therefore, according to the above-mentioned cutting device, good cutting can be performed without the cut surface becoming rough.

The above-mentioned punches 20 and 21 can be driven by actuators individually provided, one example of which is as shown in FIGS. 7 and 8. That is, the example given here is an example in which the cutting device is incorporated in a press machine 31 having a hydraulic cylinder 29 that operates vertically and a hydraulic cylinder 30 that operates horizontally so as to be orthogonal to the hydraulic cylinder 29. In the example, the base part 11 is installed in a state of being inclined at 45 ° with respect to the horizontal plane, and accordingly, the pipe 13 is held so that one opposing surface is along the horizontal direction. With such a configuration, the fixed-length feed of the pipe 13 and each die 1
The pipe 13 can be continuously and automatically cut by causing the chucking of the pipe 13 by 4, 15 and the operations of the hydraulic cylinders 29, 30 to be performed at timings mutually.

By the way, in the above embodiment, the lower die 1
The pipe 13 is chucked and released by moving the pipe 5 up and down. However, the present invention is not limited to the above embodiment. The upper die 14 is moved up and down to chuck the pipe 13. And release may be performed, or other appropriate means may be adopted.

[0019]

As described above, according to the cutting apparatus of the present invention, the pair of punches that move back and forth in the directions orthogonal to each other and the shearing blades formed at the tips of the punches form the side wall portion along the operating direction. Since it is sheared in sequence and the shear blade pushes the chips out of the hollow member, the cutting angle of the shear blade is always constant and does not change on each side wall, and the chips are discharged well. Since it does not interfere with the shearing blade, the cutting surface becomes better and the cutting surface can be used as it is as a welding groove, so that the welding process can be omitted and the workability is improved. Can be planned.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is an explanatory diagram showing a state where shearing is performed by one shearing blade.

FIG. 4 is a cross-sectional view of the pipe after shearing with one shearing blade.

FIG. 5 is an explanatory diagram showing a state where shearing is performed by the other shearing blade.

FIG. 6 is a front view showing a state in which the grip of the pipe is released.

FIG. 7 is a front view of a state where the press machine is assembled.

8 is a view taken along the line VIII-VIII in FIG.

FIG. 9 is a schematic view showing an example of a conventional cutting device.

[Explanation of symbols]

 13 Pipe 14 Upper Die 15 Lower Die 20,21 Punch 26,27 Shearing Blade

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Ito 5-14 Midorigaoka, Toyota-shi, Aichi Otoyo Seiki Co., Ltd.

Claims (1)

[Claims] 1. A die for gripping and fixing a hollow member having a rectangular cross section from the outside of its four faces, a pair of punches that move back and forth in a direction perpendicular to the outer surfaces of the hollow member that are adjacent to each other, and grip by the dice. A pair of shear blades formed at the tip of each punch so as to press the pair of wall portions along the direction parallel to the moving direction of each punch diagonally from the inner surface to the outer surface of the punched hollow member. And a hollow member cutting device.