JPH09267214A - Cutting machine for metallic section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the stroke of a movable dies driving piston member for miniaturizing a cutting machine and improving the convenience for use when a U-shaped section is attachably held by fixed dies and a cutting edge of the movable dies is put into a gap between the fixed dies for cutting-off. SOLUTION: Movable dies 23 having cutting edges 26 to cut off a section by putting both side walls of the section into a gap 21 between fixed dies fitted in grooves 19, 20 to be held are pivotably turned. A piston member 31 is adapted to act on a portion between the turning center 24 of the movable dies 23 and the cutting edge 26 to expand and transmit the stroke to the cutting edge 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable cutting machine for cutting a metal profile on site.

[0002]

2. Description of the Related Art For example, in constructing an indoor electric wiring circuit, a raceway or a duct conforming to the technical standard for electric equipment is used for attaching electric wires and lighting equipment.

These raceways or ducts are metal profiles having a U-shaped cross section and are usually cut to a predetermined length at a construction site.

For a portable cutting machine for that purpose, especially the cutting end of the profile is not deformed or crushed, the cutting blade is not easily damaged, and a predetermined part of the profile can be accurately cut. The functions such as easy attachment / detachment of the profile to the cutting machine and the ability to efficiently perform a large number of cutting operations are required, and the cutting machine as shown in FIG. 8 is marketed to satisfy these functions. Are provided to.

That is, in the cutting machine shown in FIG. 8, a tool holder 62 is fixed to the tip of a hydraulic cylinder 61 which is a reciprocating drive prime mover which is roughly operated by electric force or manual force.
A fixed die 64 arranged in front of the hydraulic cylinder 61 and a tool holder 62 are joined by an arm member 63 while keeping a constant gap therebetween, and a movable die with a cutting blade that is linearly reciprocated by a piston of the hydraulic cylinder 61. 6
9 is arranged along the side surface of the tool holder 61.

The fixed die 64 has two flat plate-shaped die parts 66 and 67 which are arranged in parallel with each other with a gap 65, and the side wall of the shape member 71 is opened to the inner end face facing the movable die 69. 72, a plurality of grooves 6 into which the 72 is fitted
8 is provided. In addition, the movable die 69 has a gap 6
It is made in a flat plate shape having a thickness slightly smaller than 5, and is provided with a triangular cutting blade 70 at the tip.

The groove 68 is provided so as to accommodate two kinds of shape members having different width dimensions, and the shape member 71 is inserted into the facing gap between the tool holder 62 and the fixed die 64 from above in the drawing to form a side wall thereof. 72, 72 are fitted into the groove 68 and the bottom wall 7
3 is brought into contact with the inner end surface, and the movable die 69 is advanced to enter the gap 65 to cut the profile 71.

That is, cutting is performed by a shearing process using a movable die 69 serving as a punch and a fixed die 64 serving as a die, and the gap between the die pieces 66 and 67 and the cutting blade 70 is appropriately set. This does not cause noticeable deformation or crushing of the cutting end surface, and the cutting blade 7
In addition to not damaging the fixed die 6, the cut portion can be easily visually matched with the gap 65 so that accurate cutting can be performed.
4 has the advantage that it can be easily attached to it and that it is very easy to remove it after cutting.

[0009]

However, in the above-mentioned conventional cutting machine, the movable die 69 moves forward across the opposing gap into which the profile 71 is inserted, and further enters the gap 65 to perform the cutting operation. The stroke is large because the linear reciprocation of the piston of the cylinder 61 is performed as it is. Therefore, it is necessary to enlarge the hydraulic cylinder 61 and the liquid tank, and it is inevitable that the hydraulic cylinder 61 and the liquid tank become large in size and heavy in weight, and the operator is likely to get tired when performing a large number of cutting operations. is there.

Further, the cutting is performed at the leading edge of the cutting blade 70 at the bottom wall 7.
3 is performed by breaking through the central portion of No. 3 and then causing an oblique blade portion extending to both sides of the tip edge to cause shearing from the bottom wall 73 to the side walls 72, 72 and cause breakage. When this happens, two L-shaped cutting chips are generated. This cutting waste is pushed by the diagonal blade portion of the cutting blade 70 and escapes to the both sides, and tends to be pressed against the upper and lower surfaces of the gap 65 in FIG. Is left behind and is pushed toward the opening of the gap 65 on the side opposite to the groove 68 by the cutting waste generated by the next cutting. When the cutting is repeated, a large number of cutting chips are randomly folded and remain in the gap 65, and the movable die 69
Increase resistance to load, malfunction, cutting blade 70
Prone to problems such as early damage of.

According to the present invention, as described above, it is inevitable that the conventional cutting machine has a large size and a large weight, and in addition to this, cutting waste remains to increase the load and malfunction. The invention was invented to eliminate the problem that the cutting blade is likely to be damaged early.

[0012]

That is, the present invention firstly provides:
A movable die having a cutting blade that cuts the shape member by entering the gap of the fixed die that fits and holds the shape member is swung, and the portion between the turning center of the movable die and the cutting blade is assumed. It was decided to make the piston member act to cause the turning motion. By doing so, even if the opening between the fixed die and the movable die is set to a size capable of inserting the profile, the cutting blade can be largely operated by a small movement of the piston member, and as a result, a small stroke, A compact reciprocating drive motor can be used to reduce the overall size and weight of the engine, making it a user-friendly cutting machine.

Secondly, according to the present invention, stepped wall portions are provided at both ends of the cutting blade to prevent lateral escape of cutting waste. This makes it easier to discharge the cutting waste from the gap between the fixed dies, avoids an increase in resistance to the movable die, premature damage to the cutting blade, and the like, and a cutting machine that maintains stable performance can be provided.

Further, in the present invention, in addition to this, a means for causing the movable die to constantly exert a pressing force of the piston member in a surface contact state for stable swing movement, or a frame which is attached to and detached from a reciprocating drive prime mover to provide a multipurpose. It was decided to include a means that could be used as an attachment for a reciprocating drive motor.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a frame coupled to the tip of a reciprocating drive motor such as a hydraulic cylinder is provided with a fixed die and rotatably supports a movable die. It may be made into a body product and then solidified, but it is advantageous in terms of production to make it as an integrated product.

Further, in the present invention, since the fixed die stably holds the shape member and cuts without causing noticeable deformation or crushing at the cutting end, a gap is provided and two die pieces are arranged to move. Since the cutting blade of the die is inserted into this gap to cut, the frame is also composed of two frame parts arranged with a gap, and the frame part and the die part are made into one flat plate shape. Advantageously, two of the formed ones are arranged parallel to each other.

The movable die having a cutting blade that enters the gap of the fixed die may be pivotally supported on the outer surface of the frame, but in the present invention, the gap is continuous with the gap of the frame and the movable die is fitted into this gap. It was supposed to pivot. By doing this, the cutting blade and the shaft support are located on the same plane, which simplifies the shape of the movable die, and allows the frame pieces to contact both sides of the movable die to rotate without causing twisting or bending. This is advantageous because it can be cut. Further, it is preferable that the movable die has a flat plate shape by being fitted into the gap and the cutting blade entering the gap.

The piston member for turning the movable die toward the fixed die generally moves stably linearly in the gap when it is coupled to the reciprocating drive motor, but when it is not coupled, the frame is provided with a guide for linear movement. Will be required. Further, as the return spring member for returning the cutting blade to the operation start position by escaping from the gap when the cutting is finished, a torsion coil spring or a torsion bar may be used.
It is preferable to use a tension coil spring to store in the air gap.

The inner end surface of the fixed die, which faces the cutting blade, is designed to hold the profile stably. That is,
Two grooves for fitting the two side walls of the U-shaped member are provided in each die part piece so as to be opened to the inner end surface, and the bottom wall is held so as to overlap with the inner end surface. Further, the cutting machine of the present invention may be used only for profile members having the same size, but it is economically preferable to be able to use it for two or more types of profile members having different sizes. Therefore, it is optimal to provide a plurality of sets of grooves into which the side walls of the respective profile members are fitted, with the centers of the bottom walls aligned.

The cutting blade has a center protruding toward the fixed die, and is formed in a triangular shape similar to a conventional product having an oblique blade portion extending from the tip edge to both sides. This shape has an advantage in that the tip edge first hits the shape member to start cutting, and the oblique blade portion gradually advances to both sides, so that the reciprocating drive motor is not overloaded. In addition, the tip edge of this cutting blade should strike the center of the bottom wall of the profile at a substantially right angle to start the cutting, and the blades on both sides should advance the cutting substantially evenly and finish the cutting at almost the same time on both sides. Is advantageous in shortening the stroke of the piston member. Therefore, when carrying out the present invention, the turning center of the movable die, the position of the cutting blade, and the projecting direction are set so that the above-described operation is performed. In particular, the inner end surface is perpendicular to the operating direction of the piston member. It is preferably formed.

Further, the cutting blade swivels from an operation start position having a space allowing insertion of a shape member to a fixed die to a cutting completion position, and a piston member therefor has a portion between the swivel center and the cutting blade. Preferably, the cutting blade is arranged so as to push the back surface portion opposite to the cutting blade at a position as close to the center of rotation as possible, whereby a large movement of the cutting blade can be performed with a small movement of the piston member.

On the other hand, the portion pushed by the piston member of the movable die gradually changes with the turning. During this time, the linear movement of the piston member is smoothly converted into the turning movement of the movable die,
In addition, it is desirable to concentrate the load on one point so as not to cause sticking. For this reason, it is preferable to install a pushing piece between the piston member and the movable die, which is always in surface contact with them, without directly contacting them. The pushing piece is held by the frame so as to be freely rotatable and movable in the reciprocating direction of the piston member. It should be noted that, when the piston member is pulled out from the frame and separated, a means for limiting the rotation may be provided so that the pushing portion piece does not become free and largely rotate so that the surface contact portion is not displaced.

Further, the cutting blade has a structure for cutting the portion located in the gap between the shape members to generate two cutting chips. The cutting debris is pushed laterally by the oblique blade portion, and there is a concern that the cutting debris generated especially on the turning center side may enter into the gap of the frame piece. Therefore, it is preferable to provide a means for preventing the escape of cutting waste to the side, and this means is appropriate to provide step walls at both ends of the cutting blade so that there is no escape to the side. is there.

Furthermore, the cutting machine of the present invention is attached to the tip of a reciprocating drive motor for use as a dedicated machine, and by providing a detachable connecting mechanism to the frame, it is presented in, for example, Japanese Patent Application Laid-Open No. 2-104498. It can be used as an attachment of a reciprocating drive motor such as a hydraulic actuator, and it is possible to effectively use one reciprocating drive motor together with an attachment that performs work such as crimping and bending. .

[0025]

1 to 7 show an embodiment of the present invention in which two plate members each having an L-shaped side surface are arranged in parallel with each other at a predetermined interval, and a portion corresponding to one side of them. Is a frame 5, and a portion corresponding to another side extending at a right angle from the tip portion thereof is a fixed die 14. Further, these plate members are fixed to each other by screws with spacer pieces 1, 2 and 3 arranged on one side and the tip of the base end of the frame 5 and the tip of the fixed die 14 being sandwiched.

A portion of the plate member which constitutes the frame 5,
That is, mounting flanges 8 and 9 are integrally formed on both sides of each base end surface of the frame parts 6 and 7 so as to project toward the base end, and one frame part 7 is located outside the mounting flange 9. In addition, the mounting lounge 10 is integrally projected.

On the other hand, a bracket 47 projecting from the tip of the reciprocating drive motor 46 is fitted between the mounting flanges 9 and 10 of the frame piece 7, and the mounting flanges 8, 9 and 10 are attached.
The frame 5 is detachably fixed to the reciprocating drive motor 46 by the mounting bolts 11 inserted through the bracket 47. The mounting flanges 8, 9, 10 and the mounting bolt 11 form a connecting mechanism 12.

A portion of the plate member that constitutes the fixed die 14, that is, inner end surfaces 17 and 18 of the die pieces 15 and 16 that face toward the base end of the frame 5 has piston members 3 to be described later.
1 is perpendicular to the movement direction. Then, two sets of grooves 19, 19 and 20, 20 for fitting the respective side walls of the two types of U-shaped profiles having different width dimensions are opened to the inner end surfaces 17, 18, and the bottom of the profile is formed. It is provided on the die pieces 15 and 16 so that the center of the wall is at the same position.

The space 13 sandwiched between the frame parts 6 and 7 of the frame 5 is largely open from the base end face to the end face on the fixed die 14 side, and the die part 1 of the fixed die 14 is formed.
The gap 21 sandwiched between 5, 16 communicates with the space 13 and is open to the inner end faces 17, 18 and the opposite side.

The movable die 23 has a gap 13 and a gap 21.
It is made in a flat plate shape with a thickness that can be inserted with almost no gap in the base, and its base end is almost on the extension of the inner end faces 17 and 18 and near the end opposite to the fixed die 14. Is supported by the support shaft 24 so as to be sandwiched between the frame parts 6 and 7 so as to be rotatable. A return spring member 25, which is a tension coil spring and is arranged inside the space 13 along the spacer piece 2, is engaged with the movable die 23.

A triangular cutting blade 26 is formed at a portion of the tip of the movable die 23 protruding from the space 13 and facing the fixed die 14. The cutting blade 26 has a center projecting toward the fixed die 14, and two oblique blade portions 28 and 29 extending from the tip edge 27 to both sides.
And have inner end surfaces 17, 1 at both ends thereof.
8 is provided with stepped wall portions 44 and 45, which has a length capable of cutting the maximum width of the shape member held by the fixed die 14 as a whole, and the tip edge 27 at the start of cutting. Hits the center of the bottom wall of the profile almost at right angles,
Subsequently, the blade portions 28 and 29 on both sides proceed so as to cut substantially evenly so that the cutting ends at almost the same time on both sides.

The piston member 31 for rotating the movable die 23 in the cutting direction has a mounting piece 32 detachably fitted at the tip of a piston 49 protruding forward from the hydraulic cylinder 48 of the reciprocating drive motor 46 at the base end side. Base 3 protruding from
3 has a configuration in which a flat plate-shaped pressing piece 34 is formed so as to project from the tip side of the pressing piece 34, and the pressing piece 34 can pass through the mounting flanges 8 and 9 with almost no gap and enter the space 13 from the base end side. There is.

Referring mainly to FIGS. 5 and 6, an arcuate recess 35 is provided in the center of the tip edge of the pressing piece 34, and is formed on the inner surfaces of the frame pieces 6 and 7 facing each other. Guide grooves 36, 37 extending in the movement direction of the piston member 31
The arcuate circumferential peripheral surface portion 39 of the notched cylindrical pushing portion piece 38 having both ends fitted therein is fitted in the recess 35 in a surface contact state. On the other hand, the pressure receiving edge 30 on the back side of the movable die 23 opposite to the cutting blade 26 and receiving the load of the piston member 31 is a straight line, and the flat upper peripheral surface portion 40 which is the cutout portion of the pushing portion piece 38 is a surface. Are in contact.

Since the cutting machine of this embodiment can be attached to and detached from the reciprocating drive motor, when the mounting bolt 11 is removed and separated, the pushing piece 38 is in a freely rotatable state, and when the mounting bolt 11 is assembled and fixed next time, May not contact. for that reason,
An end face crescent shaped in which a stop piece 42 made of a round bar is erected and fixed near the longitudinal center line of one of the grooves 37, and an end portion of the pushing part piece 38 to be fitted into the groove 37 is provided along one side peripheral surface portion. It is formed by the leg pieces 41 of. The leg piece 41 fits into the groove 37 on one side of the stop piece 42 and moves between the operation start position and the cutting completion position while changing the phase without hitting the stop piece 42, but in a freely rotatable state. Since the both ends of the leg piece 41 hit the stop piece 42, the pushing piece 38 is prevented from rotating more than a certain amount.
The arcuate surface peripheral surface portion 39 and the flat surface peripheral surface portion 40 can always be in surface contact with the recess 35 and the pressure receiving edge 30.

As a result, the linear movement of the piston member 31 is smoothly converted into the swiveling movement of the movable die 23, and there is no concern that the load is concentrated at one point to cause sticking and the like, and a stable operation is performed. be able to.

FIG. 7 is a view for explaining a process of cutting a profile with a cutting machine having such a structure, and shows a wide profile 7
1 is inserted from the front end side open portion of the fixed die 14 and the movable die 23 into the opposing space between them as shown by the arrow X, the side walls 72, 72 thereof are fitted into the corresponding grooves 20, 20, and the bottom wall 73 is formed inside. By abutting on the end faces 17 and 18, it is mounted on the fixed die 14 as shown in FIG. At this time, the mounting portion is adjusted so that the cutting portion of the shape member 71 is located in the gap 21 of the fixed die 14.

Next, the piston member 31 is advanced to rotate the movable die 23 around the support shaft 24, and the cutting blade 2
6 approaches the shape member 71, its tip edge 27 hits the central portion of the bottom wall 73 at a substantially right angle, and after breaking through, it enters the gap 21 as shown in FIG. Cuts the bottom wall 73 toward the side walls 72, 72. When the movable die 23 further swivels, the side walls 72, 72 are cut, and two L-shaped cutting chips 74, 75 are generated as shown in FIG.

The two cutting chips 74, 75 are prevented from moving laterally along the slanting blade portions 28, 29 by the step wall portions 44, 45, respectively, and the inner end surface 17, It is pushed and moved by the cutting blade 26 toward the opening opposite to 18. For this reason, the cutting scraps 74 formed by the blade portion 28 on the proximal end side of the cutting blade 26 are notably formed in the voids 13.
It is possible to prevent the return spring member 25 and the like from getting in and getting caught.

In the present embodiment, the shallow depressions 43a are formed on the inner surfaces of the die pieces 15 and 16 over the range from the bottom of the grooves 19 and 20 of the gap 21 to the opening opposite to the inner end surfaces 17 and 18. 43b are provided to face each other. The cutting scraps 74 and 75 pushed by the cutting blade 26 are the recesses 43a and 43b.
When the cutting blade 26 retreats, the cutting blade 26 becomes almost free and is easily discharged from the gap 21.

The cutting scraps 74 and 75 are not discharged and the gap 21
Even if the cutting die remains, the cutting waste that occurs next works to push them to the opening on the opposite side, so that there is no inconvenience that many pieces remain and increase the resistance to the movable die 23.

[0041]

As described above, according to the present invention, since the cutting blade is greatly moved by the small stroke movement of the piston member, a compact reciprocating drive motor is used to make the entire cutting machine compact, lightweight and convenient. Can be.

In addition to this, it is possible to cut without causing noticeable deformation or crushing of the cut end face, to discharge cutting waste satisfactorily and to maintain stable performance, and further to the movable die. The excellent effect that the pushing force of the piston member can be smoothly transmitted to perform a stable swivel motion and that the single multipurpose reciprocating drive prime mover can be used as an attachment can be obtained. .

[Brief description of drawings]

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

FIG. 2 is a view of FIG. 1 viewed from below.

FIG. 3 is a view of a fixed die portion of FIG. 1 viewed from the right side.

FIG. 4 is an enlarged cross-sectional view taken along the line AA of FIG.

5 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a cutting process diagram of the embodiment of FIG.

FIG. 8 is a perspective view of a conventional example.

[Explanation of symbols]

5 frames, 6 and 7 frame parts, 12 connecting mechanism, 13
Void, 14 fixed die, 15, 16 die piece, 17,
18 inner end face, 19, 20 groove, 21 gap, 23 movable die, 24 support shaft, 25 return spring member, 26 cutting blade, 27 tip edge, 28, 29 blade portion, 31 piston member, 38 pushing piece, 46 reciprocating Drive prime mover,

Claims (4)

[Claims] 1. A frame having two frame pieces arranged with a gap; and two die pieces extending from the tip of each frame piece with a gap continuous to the gap, A fixed die having a plurality of grooves which are opened to the inner end face of the frame toward the base end direction and into which the side wall of the shape member is fitted; A movable die that is rotatably supported and has a tip portion protruding from the gap, and a triangular cutting blade provided at a portion of the tip portion that faces the inner end surface; A piston member that pushes a back surface portion between the turning center of the movable die and the cutting blade, which is on the opposite side of the cutting blade, and turns the movable die in a direction of advancing the cutting blade into the gap; The cutting blade A return spring member that pivots the movable die in a direction of escaping from the gap; the inner end surface and the cutting blade form a shape member at a return position of the piston member from an open portion on the leading end side of the movable die to the inner end surface. A metal shape cutting machine, characterized in that they face each other with a gap that can be inserted into the front surface of. 2. The cutting machine according to claim 1, wherein both ends of the cutting blade are provided with stepped wall portions that extend toward the inner end surface and prevent cutting waste from escaping to both sides. A cutting machine for metal shaped materials. 3. The cutting machine according to claim 1, wherein a pushing piece is provided between the tip end surface of the piston member and the back surface portion of the movable die in surface contact therewith. In addition, the pressing member is held by the frame so as to be freely rotatable and movable in the reciprocating direction of the piston member. 4. The cutting machine according to claim 1, 2 or 3, wherein the frame has a connection mechanism at a base end portion thereof which is attachable to and detachable from a reciprocating drive motor that allows the piston member to enter the gap. A cutting machine for metal profile that is characterized by