JPH07303924A - Bending roll device in bending equipment for narrow diameter metallic tube - Google Patents

Abstract

PURPOSE:To smoothly perform bending of a metallic tube by elastically supporting a bending roll freely movably up and down so that the roll may be lowered by the contact pressure with the metallic tube and recovered when not in contact with the tube and thereby automatically avoiding the interference with the metallic tube by an extremely simple means using an elastic member like a spring. CONSTITUTION:A mechanism is used, for example, such that one end of a roll supporting arm 12 is freely rotatably attached axially to one end of a bracket 11 fixed to a movable arm 10 which is attached to a fixed framework 1 and which is connected to a bending actuator 7; and that a spring 15 is provided between the roll supporting arm 12 and the bracket 11 so that an upward pressurizing force may be constantly imparted to the roll supporting arm d In the case of this mechanism, at the same time when a metallic tube 2 is placed on a bending roll 4 from the curved back of the bending-roll supporting arm 12, the bending roll 4 is pressurized against the spring 15 through the rotational force of the metallic tube 2, rotating the roll supporting arm 12 downward, and thereby causing the metallic tube 2 to be transferred to the fixed framework by passing above the bending roll 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for bending a thin metal pipe at a large number of places, particularly in the case of fuel pipes of automobiles, brake pipes, etc. The present invention relates to an improvement of a bending roll device in a bending device for a small-diameter metal pipe suitable for cases where the original direction is different.

[0002]

2. Description of the Related Art Various bending apparatuses for small-diameter metal pipes have been conventionally known. However, the present inventor has found that the bending directions of bent portions are not on the same plane but different in three-dimensional directions. A suitable bending device was previously proposed (Japanese Patent Laid-Open No. 2-112).
No. 828, Japanese Patent Laid-Open No. 165819/1990).

This bending apparatus does not have a structure that does not interfere with the bending roll when the metal tube is swung around and placed at the next fixed position during bending, and can perform accurate bending.
Further, one bending work can be completed in one operation, and the metal tube can be easily taken out after all bending work is completed. Its structure is as shown in FIG. The fixed mold 1 formed into a shape that substantially matches the bending shape of the metal tube 2 over the entire length, the guide member 3 provided at a predetermined position of the fixed mold, and the outside of the fixed mold 1 by the actuator. Is provided with a bending roll 4 that moves toward the mold, and by bending or moving the bending roll 4 toward the fixed mold 1, the metal tube 2 is bent. In the figure, 5 is a pillar of the mold, and 6 is a clamp jig attached to one end of the fixed mold.

That is, in this bending apparatus, one end of a straight metal tube 2 is fixed by a clamp jig 6, and each bending roll 4 is sequentially moved toward the fixed mold 1 or moved in an arc to form a metal tube. Bending is performed by pressing the 2 along the fixed mold 1 and the guide member 3 so as to be pressed.

[0005]

In the above bending apparatus, it is necessary to avoid interference with the bending roll when the metal tube is swung around and placed at the next fixed position during bending. Therefore, as shown in FIG. 5, the bending roll 4 in this bending apparatus is, for example, attached to the tip of the piston rod of the actuator 8 attached to the fixed formwork 1 via the bracket 7 so as to be extendable and contractible via the cylinder 9.
Interference with the bending roll 4 in the next step can be avoided while the metal tube is rotating (swinging) during the bending process in the previous step. The piston rod 10 of the cylinder 9
It also serves as the axis of the bending roll 4.

[0006] However, the method of avoiding the interference with the metal tube by mounting the bending roll 4 in a stretchable manner by the fluid pressure of the cylinder 9 or the like is to interfere with the bending roll if the operation timing of the cylinder 9 or the stroke is slightly deviated. Therefore, the operation timing and stroke setting are very important, the control system for that is complicated and the cost is high, and the bearing of the piston rod 10 of the cylinder 9 also serving as the shaft for the bending roll 4 is expensive. Is subjected to a lateral load for each bending of the metal tube, the bearing of the standard cylinder originally considers the axial load sufficiently, but does not consider the large radial load repeatedly received. The expansion and contraction of 10 easily causes malfunction, and the fluid supply pipe of the cylinder is installed in a narrow space. In addition to this, this pipe interferes with the bending operation and causes the jig supporting the cylinder to have some rigidity, which causes an increase in weight and causes the bending roll to swing. There is a problem that the load on the actuator also increases.

The present invention has been made in order to solve such a problem, and in place of the fluid pressure cylinder system, the interference with the metal tube is automatically made by an extremely simple means using an elastic member such as a spring. The present invention aims to provide a bending roll device that can be effectively avoided and that can smoothly bend a metal tube.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a fixed mold with a guide member is formed in a shape that substantially matches the bending shape of a metal pipe over its entire length, and an actuator moves toward the fixed mold. It is a gist of a bending apparatus for a small-diameter metal pipe provided with a bending roll, in which the bending roll is elastically supported so as to be vertically movable so as to be lowered by the contact pressure of the metal pipe and return when not in contact.

[0009]

As the elastic supporting means of the bending roll, for example, a mechanism which constantly applies upward pressure to the bending roll supporting arm with a spring or the like can be used. Specifically, for example, one end of a roll support arm is rotatably attached to one end of a bracket fixed to a movable arm attached to a fixed formwork and connected to a bending actuator, and the roll support arm and the bracket are attached. It is possible to use a mechanism in which a spring is applied between the roll supporting arms to constantly apply upward pressing force to the roll supporting arm. In the case of this mechanism, at the same time as the metal tube gets on the bending roll from the curved back surface of the bending roll support arm,
The turning force of the metal tube pushes the bending roll against the spring to rotate the roll support arm downward, whereby the metal tube passes over the bending roll and is smoothly transferred onto the fixed mold. At the same time when the metal tube is separated from the bending roll, the bending roll returns to its original position, that is, on the bending plane of the metal pipe by the spring again.

Therefore, according to the present invention, even when the metal tube is swung around and interferes with the bending roll during the turning operation of the metal tube, that is, in the bending step in the previous step, that is, in the bending plane in the previous step. When a bending roll is present on the bending roll, the bending roll is elastically supported by a spring, so that the metal pipe is placed on the bending roll, and at the same time, the bending force is pressed against the spring by the turning force of the metal pipe. Therefore, the bending roll can be avoided from its interference. Then, at the time of bending, the bending roll returns to the bending plane again by the spring, so that the bending operation of the metal tube can be continued without any trouble.

[0011]

1 is a partial perspective view showing an example of a bending roll device according to the present invention, FIG. 2 is a side view of an example of the bending roll device, and FIG. 3 is a side view of another example of the bending roll device. In the figure, 10 is a movable arm, 11 is a bracket, 12 is a bending roll support arm having a curved back surface 12-1 that serves as a guide for a metal tube, 13 is a pivot, and 14 is fixed to the bending roll support arm 12 and attached to the bracket 11. The stopper member 15 that abuts is a spring.

That is, according to the present invention, one end of a bending roll supporting arm 12 is vertically rotated by a pivot 13 on a bracket 11 fixed to a movable arm 10 for bending which is attached to a fixed mold 1 at one end. An upward force is applied to the bending roll support arm 12 by a tension spring 15 that is mounted between the bracket 11 and a stopper member 14 that is movably attached and fixed to the support arm 12 and has its lower end locked to the bracket 11. It has a structure. The other end of the movable arm 10 is connected to the piston rod of the bending actuator 7. The bending roll 4 is pivotally supported on the upper end of the support arm 12.

In the case of this structure, the bending roll supporting arm 1
Normally, 2 is set so that an upward force is applied by a spring 15 and a predetermined height position, that is, the bending roll 4 is present on a bending plane by a stopper member 14. In this state, when the metal tube 2 approaching from the back side of the bending roll supporting arm 12 by the bending process of the previous step comes into contact with the curved back surface 12-1 of the supporting arm, the bending roll is rotated according to the turning force. The support arm 12 pivots downward about the pivot 15 against the spring 15, and subsequently the metal tube 2
Is further slidably brought into contact with the curved back surface 12-1 of the support arm, and is further moved to rest on the bending roll 4, and when the turning force of the metal tube 2 is applied to the bending roll 4, the bending roll support arm 12 resists the spring 15. Further, it rotates downward and the bending roll 4 descends. Then, at the same time when the metal tube 2 passes through the upper surface of the bending roll 4 and comes off, the turning force is released, and the bending roll supporting arm 12 is returned to the original height position by the spring 15.
In this case, the spring applied to the bending roll support arm 12 has such a force that the support arm can be easily lowered by the turning force of the metal tube and the metal tube can be returned to the original height position at the same time as it is separated. It goes without saying that the one that has is used.

In the above bending roll device, since the bending roll 4 projects to a predetermined height, that is, the bending plane position in the next process, the metal tube 2 is swung around during the bending process in the previous process and interferes with the bending roll 4. However, since the bending roll 4 is attached to a supporting arm elastically supported by a spring 15 so as to be vertically movable, even if the metal tube 2 is placed on the bending roll supporting arm 12 and the bending roll 4, Since the metal tube 2 is lowered against the spring 15 by the bending operation (rotational force), the metal tube 2 is smoothly transferred onto the fixed mold 1,
At the same time, the bending roll 4 returns to the original height position, and the bending process for the next step of the metal tube is taken. Then, the bending actuator 7 in the next step is activated to enter the bent state, and the bending step of the metal tube 2 in the next step is performed.

The means for elastically supporting the bending roll is not limited to the mechanism illustrated here, and for example, as shown in FIG. 3, compression is performed between the upper end of the bending roll support arm 12 and the movable arm 10. A method of installing the coil spring 15 'and elastically supporting the bending roll support arm 12 can be adopted. In addition to this, although not shown, it is also possible to apply a rotational force to the pivot with a spring or to use a bellows or the like, and a method of directly supporting the bending roll itself with an elastic material. It is also possible to use.

[0016]

As described above, the present invention has the following effects. (1) Since the bending roll is elastically supported by springs, etc., when the metal pipe is swung around and interferes with the bending roll during the bending process in the previous process, the bending roll is pressed downward by the turning motion of the metal pipe. As it is lowered, it can be avoided from the interference. (2) During bending, the bending roll returns to the bending plane by elastic force again, so the bending operation of the metal tube can be continued without any hindrance. (3) Since an elastic material such as a spring is used as the operation source of the bending roll, the structure is simpler than the conventional bending roll device such as a fluid pressure cylinder and the cost is low.
It is convenient to provide it in a narrow space, and the bending roll supporting member can also be made lightweight, so that the load on the bending actuator can be reduced. (4) The bending apparatus for a thin metal tube can be downsized, and the cost of the bending apparatus can be reduced.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an example of a bending roll device according to the present invention.

FIG. 2 is a side view showing a bending roll supporting portion of the above bending roll device.

FIG. 3 is a side view showing another embodiment of the bending roll supporting means in the above bending roll device.

FIG. 4 is a schematic perspective view showing an example of a bending apparatus for a thin metal tube, which is a target of the present invention.

FIG. 5 is a schematic perspective view showing a structural example of a metal tube bending roll device in the same device.

[Explanation of symbols]

 1 Fixed Formwork 2 Metal Pipe 3 Guide Member 4 Bending Roll 5 Formwork Support 6 Clamping Jig 7 Actuator 8 Cylinder 10 Movable Arm 11 Bracket 12 Bending Roll Supporting Arm 12-1 Curved Back Surface 13 Axis 14 Stopper Member 15 Spring

Claims (1)

[Claims] 1. A small-diameter metal provided with a fixed formwork with a guide member, which is formed into a shape that substantially matches the bending shape of the entire length of the metal tube, and a bending roll that moves toward the fixed formwork by an actuator. In a pipe bending apparatus, the bending roll is elastically supported so as to be vertically movable so as to be lowered by the contact pressure of the metal tube and return when not in contact with the metal tube. .