JP2001137957A - Push through type bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hardly cause a flaw on the surface of a work, to hardly cause buckling to the work and to hardly cause a wrinkle on the inner peripheral face of the work. SOLUTION: A device is provided with a fixed die 1 having a work passing through hole 3 and a moving die 2 which has a work passing through hole 4, is arranged in front of the fixed die and is supported to freely turn, displace and rotate, a work W is bent, while passing through, between the fixed die and the moving die. A roller 5 is arranged at a work outlet side of the work passing through hole of the fixed die and at the inside of the direction the work is bent. A resin block is arranged at a bottom side of the roller and adjacent to the roller. The roller is formed to the barrel shape having a diameter at a center side larger than both end diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-through bending apparatus used for bending a metal work such as various aluminum profiles and steel pipes.

[0002]

2. Description of the Related Art In recent years, when bending a metal workpiece such as an aluminum profile or a steel pipe, a push-through bending apparatus called a multi-bender is sometimes used. As shown in FIG. 7, the bending apparatus includes a fixed mold 101 having a work conducting hole 100 and a work conducting hole 102 disposed in front of the fixed mold 101 in the extrusion direction. And a gyro movable mold 103 supported so as to be displaceable and rotatable.

[0003] In this bending apparatus, for example,
A work W made of an extruded material is set so as to pass through the work conduction hole 100 of the fixed mold 101, and the work W is pushed forward by a feeder (not shown). The fulcrum portion and the movable mold 102 are bent with the acting point portion.

[0004]

However, the conventional push-through bending apparatus described above has the following problems. That is, when the workpiece W is bent between the fixed mold 101 and the movable mold 103, Fa is provided near the exit of the fixed mold 101, and F is applied to the movable mold 103.
A large load b is applied. And, of course, these reaction forces act on the work W. Here, since a roller is used in a portion of the movable mold 103 that comes into contact with the work W, the movable mold 103 and the work W are in "rolling contact" and the frictional force generated therebetween is relatively small. However, since the fixed mold 101 and the workpiece W are in "slip contact" where the surfaces slide with each other, a relatively large frictional force acts. There is a problem that the surface of the work W is scratched or the work W buckles due to the large frictional force.

Further, as described above, when the work W is bent, a compression force acts on the inside of the bending direction of the work W, and the compression force causes wrinkles on the inner peripheral surface of the work W. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent the surface of a work from being easily scratched, causing the work from being easily buckled, An object of the present invention is to provide a push-through bending apparatus in which wrinkles are less likely to occur on the inner peripheral surface.

[0007]

The present invention has the following features in order to solve the above-mentioned problems. That is,
The press-through bending apparatus according to claim 1, wherein a fixed mold having a work conducting hole, and a movable mold having a work conducting hole and arranged in front of the fixed mold, are supported so as to be capable of turning, displacement, and rotation. In a push-through bending apparatus in which a workpiece is bent while being pushed through between a fixed mold and a movable mold, the work exit side of a work conduction hole of the fixed mold includes a work, The roller is disposed inside the direction in which the roller is bent. In the above-described push-through bending apparatus, since the roller is in rolling contact with the work, the frictional force with the work is reduced. For this reason, the load acting on the work is reduced, the surface of the work is less likely to be scratched, and buckling is less likely to occur. Also, when the roller is made of iron having high rigidity, since the roller serves as a bending fulcrum, the bending fulcrum is less likely to be deformed such as abrasion or crushing, so that the variation of the forming R at the time of bending is reduced. Is also obtained. Incidentally, when the resin block is used as a bending fulcrum, the resin block is more liable to be deformed such as abrasion and crushing than iron, so that the variation of the forming R at the time of bending is inevitably increased.

[0008] A push-through bending apparatus according to a second aspect is characterized in that a resin block is disposed on the inner periphery of the work conduction hole of the fixed die and on the inner side of the roller. I have. In the above push-through bending apparatus, the resin block that comes into contact with the work with a strong force is made of a relatively soft material. Can be further eliminated. Further, since the resin block has a small coefficient of friction, the load when the work is extruded is reduced.

A third aspect of the present invention is characterized in that a drum-shaped portion having a diameter at the center side larger than the diameter at both ends is formed on the roller. In a push-through bending apparatus, a compressive force acts on an inner portion of a workpiece where bending is performed, and wrinkles are generated by the compressive force. However, in this push-through bending apparatus, since a drum-shaped part is formed on the roller, the inner part of the work abutting on the drum-shaped part is slightly pushed inward to increase the surface area of the work in the bending direction. Becomes wider. For this reason, generation of wrinkles can be prevented.

According to a fourth aspect of the present invention, there is provided a push-through bending apparatus, wherein a plurality of drum-shaped portions are formed on the roller. In the above push-through bending apparatus, for example, when a workpiece having a cross-sectional shape of “day” or “eye” is bent along the surface direction of the reinforcing portion arranged at the center, wrinkles are formed. Occurs only on the inner peripheral surface surrounded by the reinforcing portion. Therefore, if a plurality of drum-shaped portions are formed on the roller so as to face the inner portion in the bending direction surrounded by the reinforcing portion of the work where the wrinkles occur, the occurrence of wrinkles can be prevented.

According to a fifth aspect of the present invention, there is provided a push-through bending apparatus, wherein the resin block is disposed adjacent to the roller without forming a gap between the resin block and the roller. . In the push-through bending apparatus, when the roller and the resin block are disposed inside the work conduction hole of the fixed mold and inside the direction in which the work is bent, if there is a gap between both, the portion is disposed. The work enters the surface and causes wrinkles. Here, since the resin block and the roller are arranged adjacent to each other and no gap is formed between the two, the occurrence of wrinkles can be prevented.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. 1 to 6 show a first embodiment of the present invention.
An embodiment will be described. FIG. 1 is a side sectional view schematically showing a push-through bending apparatus according to the present invention. Symbol 1 in the figure
Reference numeral denotes a fixed mold, and reference numeral 2 denotes a movable mold disposed in front of the fixed mold 1 and supported to be able to turn, displace, and rotate. The stationary mold 1 and the movable mold 2 are provided with work conduction holes 3 and 4, respectively.

A roller 5 is arranged on the work outlet side of the work conduction hole 3 of the fixed mold 1 and inside the bending direction of the work. The roller 5 is arranged so that its axis is orthogonal to the surface on which the workpiece is bent. As shown in FIG. 2, the roller 5 is provided coaxially with the roller body 6 while protruding outward from the center roller body 6, the flanges 7 at both ends, and the flanges 7, 7. It is composed of supported parts 8 and 8. In the roller body 6, a drum-shaped portion 6a having a diameter Da on the center side larger than diameters Db on both ends is formed. In the illustrated example, only one drum-shaped portion 6a is provided, and the entire roller body 6 has a drum-shaped shape.

When the entire roller body 6 is formed in a drum shape, for example, as shown in FIG. 3A, the roller body 6 is formed in an arc shape with the same curvature over the entire area of the roller body at the left end, the center and the right end. , As shown in FIG.
The central portion and the right end portion are all formed in a straight line, and a bent portion is formed at the boundary between them. As shown in FIG. 3 (d).
As shown in (2), it is conceivable that the central portion is formed in an arc shape and the left and right end portions are formed in a straight line so as to be continuous therewith.

When the roller body 6 is formed by bending a square pipe having a diameter of, for example, about 70 mm, the diameter Da on the center side is 25 m.
m and the diameter Db at both ends are set to about 24.4 mm. The roller 5 is, for example, an iron roller used as a quenching material such as S45C.

A resin block 10 is provided on the inner periphery of the work conducting hole 3 of the fixed mold 1 and on the inner side of the roller 5.
Is arranged. The resin block is made from a material called monomer casting nylon. Monomer-casting nylon is prepared by quickly and uniformly mixing a catalyst and a stabilizer with molten monomer in an inert gas and then pouring it into the mold, where polymerization occurs in the mold and is formed into a predetermined shape in one step. It is made by Monomer casting nylon is characterized by high mechanical strength, excellent wear resistance and chemical resistance, and a low coefficient of friction.

The end 1 on the roller 5 side of the resin block 10
0a is a wedge shape in which the upper surface is concave in an arc shape corresponding to the shape of the roller main body 6, whereby the resin block 10 is not formed with a gap between the resin block 10 and the roller 5, It is arranged adjacent to the roller 5. A work supporting portion 11 made of steel is provided on the inner surface of the work conducting hole 3 and facing the resin block 10, similarly to the conventional push-through bending apparatus.

The movable mold 2 is provided with straight rollers 12, 12 which are parallel to each other with a predetermined space therebetween, and the work conduction hole 4 is formed between the rollers 12, 12. ing.

Next, a case where the work W is bent using the push-through bending apparatus having the above-described configuration will be described. First, the work W is set by passing the work through hole 3 of the fixed mold 1 and the work through hole 4 of the movable mold 2. As the workpiece W, various workpieces can be processed. For example, as shown in FIGS. 4A to 4D, the workpiece W is a square pipe having a rectangular cross section, and the cross section is substantially rectangular. The shape is a square pipe shape with one of the corners cut off in a flat shape, a cross-shaped "sun" shape with several reinforcements Wa passed in the middle, or a cross-section "eyes" And the like.

The work W set as described above is pushed forward by a feeder (not shown). The extruded work W is bent using the fixed mold 1 as a fulcrum and the movable mold 2 as an action point. At this time, a roller 5 is disposed at the outlet of the fixed mold 1, and a force for bending the work W is applied via the roller 5. "Rolling contact". For this reason, only a relatively small frictional force acts between them, and as a result, it is possible to prevent the surface of the work W from being damaged or the work W from buckling.

A resin block 10 is disposed on the inner periphery of the work conduction hole 3 of the fixed mold 1 and on the back side of the roller 5, and the resin block 10 is made of metal. Since it is softer than the conventional one, it is possible to further prevent the surface of the work W from being damaged. Also,
Since the resin block 10 has a small friction coefficient, the work W
There is also an advantage that the extrusion load when extruding can be reduced.

Further, since the roller 5 is formed in a drum shape having a diameter Da at the center side larger than the diameter Db at both ends, when the work W is bent, the work W comes into contact with the drum-shaped portion. Is slightly expanded inward, so that the surface area of the inner portion in the bending direction of the work is increased. For this reason, it is possible to prevent the occurrence of wrinkles that occur inside the work during the bending process, which has been conventionally observed.

Further, the resin block 10 is disposed adjacent to the roller 5 without forming a gap between the roller 5 and the roller 5. Therefore, the gap between the roller 5 and the resin block 10 is reduced. It is possible to prevent a phenomenon in which a part of the work W flows into the workpiece and wrinkles occur.

On the other hand, when the work W has a cross-shaped "day" shape or a cross-shaped "eye" shape as shown in FIGS. The shape of the roller 5 arranged on the outlet side of the fixed mold 1 is determined according to the shape. For example, when the work W has a cross-shaped “day” shape, as shown in FIG. 5, rollers 15 each having two drum-shaped portions 6a formed at both left and right end portions are used. In the case where the work W has a shape of a cross section of “eyes”, as shown in FIG. 6, two drum-shaped portions 6a are formed at two central portions at predetermined intervals at the left and right end portions of rollers 25. Used. The reason why the drum-shaped portion 6a is not formed at the central portion of the roller 25 used for bending the work W whose cross section is the shape of an "eye" is that the central portion of the work W is surrounded by the reinforcing portion Wa. This is because wrinkles are originally low.

The above-described embodiment is merely an example, and the design can be changed as needed unless the gist of the invention is changed. For example, in the embodiment of the present invention, only one roller 5 is disposed at the outlet of the fixed mold 1, but the roller 5 may be disposed along the direction in which a plurality of workpieces W are pushed through.

[0026]

As described above, according to the present invention, the following excellent effects can be obtained. According to the push-through bending apparatus according to the first aspect, the roller is arranged on the work exit side of the work conduction hole of the fixed mold, and the roller comes into rolling contact with the work, so that the frictional force with the work is reduced. Decreased,
For this reason, the load acting on the work is reduced, the scratches generated on the surface of the work can be reduced, and buckling can be prevented.

According to the push-through bending apparatus according to the second aspect, the resin block is disposed on the back side of the roller, and the resin block that strongly contacts the work is made of a relatively soft material. As compared with the case of using a conventional fixed mold using a product made of a product, scratches on the surface of the work can be further reduced. In addition, since the resin block has a small coefficient of friction, the load when the work is extruded can be reduced.

According to the push-through bending apparatus according to the third aspect, since the roller has a drum-shaped portion having a diameter at the center side larger than the diameter at both ends, the inner portion of the work abutting on the drum-shaped portion is formed. Can be expanded inward to increase the surface area of the inside portion of the workpiece in the bending direction, and as a result, it is possible to prevent the occurrence of wrinkles inside the workpiece in the bending direction.

According to the push-through bending apparatus according to the fourth aspect, a plurality of drum-shaped portions are formed on the roller, and the work has a cross-sectional shape of "day" or "eye". However, it is possible to prevent wrinkles from being generated inside the work in the bending direction.

In the push-through bending apparatus according to the fifth aspect, the resin block is disposed adjacent to the roller without forming a gap between the roller and the roller, and the work is formed between the roller and the resin block. Wrinkles caused by entering the gaps can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a push-through bending apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of a roller.

FIGS. 3A to 3D are schematic diagrams illustrating various examples of rollers.

FIGS. 4A to 4D are cross-sectional views showing various examples of a work.

FIG. 5 is a front view showing another example of the roller.

FIG. 6 is a front view showing still another example of the roller.

FIG. 7 is a side sectional view showing a conventional push-through bending apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed mold 2 Movable mold 3 Work conduction hole 4 Work conduction hole 5 Roller 6 Roller body 6a Drum-shaped part 10 Resin block 10a End of resin block 15 Roller 25 Roller

Claims (5)

[Claims] 1. A fixed mold having a work conducting hole, and a movable mold having a work conducting hole and disposed in front of the fixed mold and supported for turning, displacement, and rotation. In a push-through bending apparatus in which a workpiece is bent while being pushed through between a mold and a movable mold, a work outlet side of a work conduction hole of the fixed mold,
A push-through bending apparatus, wherein a roller is disposed inside a direction in which the workpiece is bent. 2. A push-through bending process according to claim 1, wherein a resin block is disposed on an inner periphery of the work conduction hole of the fixed mold and on a back side of the roller. apparatus. 3. The push-through bending apparatus according to claim 2, wherein the roller has a drum-shaped portion having a diameter on the center side larger than diameters on both ends. 4. The push-through bending apparatus according to claim 3, wherein a plurality of drum-shaped portions are formed on the roller. 5. The resin block according to claim 2, wherein the resin block is disposed adjacent to the roller without forming a gap between the resin block and the roller. Push-through bending machine.