JP2001047141A - Bending device of tapered tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently bend a various shape tapered tube to any shape without changing a roll guide means by using a roll guide having a recessed groove surely capable of being in touch with the outer diameter part of each position in the tapered tube in bending the tapered tube. SOLUTION: A roll guide 21 arranged with a recessed groove is used for a means to press a tapered tube 10 along a bending die 11, a curved face of the recessed groove of the roll guide 21 is formed from the parabolic curved face obtained by synthesizing plural partial curved faces 23a, 23b, 23c, 23d... accomodating the outer diameter curved faces of plural positions in the tapered tube 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending device for bending a tapered tube into a predetermined shape.

[0002]

2. Description of the Related Art For example, when a tapered tube used for a street light or the like is bent into a predetermined shape, the outer diameter of the tapered tube gradually changes according to the length. If it is attempted to bend with a grooved guide roll in a state where it is attached to the tapered pipe, even if the curved surface of the groove of the guide roll matches the outer diameter curved surface of the tapered pipe, the tapered pipe can be bent properly, In a portion where the curved surface of the concave groove of the roll is larger or smaller than the outer diameter curved surface of the tapered tube, there is a problem that the tapered tube cannot be appropriately bent by the guide roll.

Therefore, conventionally, when a tapered pipe is bent into a predetermined shape, as shown in FIGS. 6 and 7, an outer diameter curved surface 2 of a predetermined length portion of the tapered pipe 1 to be bent is used. A long guide rail 4 provided with a concave groove 3 of a predetermined length having a tapered curved surface conforming to the above is applied to the outside of the tapered tube 1, and this guide rail 4 is moved along a rail 5 with respect to a clamp 6. While sliding
By rotating the guide rail 4 along the outer periphery of the bending die 7 on the rear surface, a bending force is applied to the tapered tube 1.

[0004]

However, in this method, the tapered pipe outer diameter curved surface 2 having a predetermined length has a taper-shaped curved surface compatible with the outer diameter curved surface 2 of the tapered pipe 1. Since the tapered pipe 1 is bent by applying a long guide rail 4 having a concave groove 3, another tapered pipe having a different taper ratio and outer diameter from the tapered pipe 1 by one bending machine. Each time the guide rail is bent, the guide rail must be manufactured and replaced so that the length and the shape of the curved surface of the concave groove conform to the dimensional specifications of another tapered pipe. Since a guide rail suitable for this must be prepared for each different tapered pipe, there is a problem in that the management and the process are complicated, and the cost required for bending is also high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional taper pipe bending apparatus, and when the taper pipe is bent at an arbitrary position on a plane, the diameter of each position is reduced. By using roll guide means that can reliably touch according to the difference, it is possible to bend taper pipes of various sizes accurately with a common roll guide means without the need for replacement It is intended to provide a device.

According to a first aspect of the present invention, there is provided a bending tool for bending a tapered tube into a predetermined shape, and a taper tube attached to the bending tool by means of a rotating base. And a roll guide that rotates while being pressed along.The concave groove curved surface of this roll guide is composed of a plurality of partial curved surfaces having different curvatures that match the outer diameter curved surfaces at a plurality of positions in the tapered tube. It is characterized by being formed by a parabolic curved surface.

According to a second aspect of the present invention, a roll guide device having a bearing rotatable in the left-right direction via a pin is provided at a tip of a guide damper on a rotary base, and at least the roll guide device is provided on the same plane of the roll guide device. A pair of left and right roll guides are rotatably mounted on a shaft.

[0008]

In the taper pipe bending apparatus according to the present invention, the concave groove curved surface of the roll guide for bending the tapered tube is adapted to the outer diameter portion curved surface at a plurality of different positions depending on the taper ratio in the tapered tube. Since the roll guide is formed by a combined parabolic curved surface of the partial curved surface, when the roll guide is brought into contact with the tapered pipe, the concave groove of the roll guide becomes the taper of the combined partial curved surfaces. The partial curved surface at the position that matches the outer diameter part of the pipe will come into contact with the outer diameter part of the tapered pipe, and if this roll guide applies bending force to the tapered pipe, it will correspond to the outer diameter part of the tapered pipe With each of the partially curved surfaces described above, the tapered tube can be easily and appropriately bent over a predetermined length.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a main part of a bending apparatus for a taper pipe according to the present invention; FIG. Is a bending mold (form roll), 12
Denotes a fixed base, and 13 denotes a rotating base. The tapered tube 10 is disposed on the same plane as the bending die 11 such that a predetermined length portion to be bent projects forward (to the left in FIG. 1) from the fixed base 12.
Is fixed via a fixing base 12 to a base end portion of the base.

When viewed from a plane, the bending mold 11 is provided with a tapered tube 10 around an axis 14 which is the radius of rotation of the rotary base 13.
Is formed so as to have a curvature for bending the tapered tube into a desired shape, and is provided with a concave groove 15 for fitting the tapered tube 10 around its periphery. More specifically, the bending mold 11 is configured by connecting a large number of mold members 16 whose peripheral edge portions are divided into a plurality of pieces over the entire length, and each mold member 16 has a concave groove 15 in the tapered tube 10. It has a curved surface conforming to a different outer diameter portion curved surface according to the ratio of the taper. By connecting all the mold members 16, a tapered concave groove curved surface conforming to the entire length of the tapered surface of the tapered tube 10. Are formed continuously.

On the other hand, a tapered tube 1 is attached to the rotation base 13 which rotates around the shaft 14 around the bending mold 11.
There is provided a roll guide device 17 for pressing 0 toward the concave groove 15 of the bending mold 11.

The roll guide device 17 includes a guide damper 18 which can be moved back and forth along the length direction of the rotary base 13 by a hydraulic cylinder 24 shown in FIG. Bearing 20 rotatably supported in a direction, and a pair of left and right roll guides 21 rotatably mounted on the distal end of the bearing 20.
It consists of

As shown in FIG. 3, the roll guide 21 has a concave groove 22 which fits the curved surface of the outer diameter of the tapered tube 10 which is sandwiched between the roll guide 21 and the concave groove 15 of the bending mold 11. However, as shown in FIG. 5, each of these concave grooves 22 has a plurality of partially curved surfaces 23a, 23 which are adapted to the outer diameter curved surfaces having different sizes at a plurality of positions in the tapered tube 10.
3b, 23c, and 23d are formed by a combined parabolic curved surface.

In order to obtain a parabolic curved surface of the concave groove 22, first, as shown in FIG. 4, the entire length of the tapered tube 10 is appropriately changed at a plurality of positions A, B, C, D according to the ratio of the taper. , And then, as shown in FIG. 5, a pipe outer diameter portion AR at the largest position A is drawn at a position centered on the intersection point a on the intersecting X and Y axes, and is drawn on the X axis. The pipe outer diameter portion BR at the position B is located at the position centered on the next intersection b moved leftward along the axis, and the tube outer diameter portion at the position C is located at the intersection c moved further left on the X axis. Each of the tube outer diameter portions AR, BR, CR, DR,... Is drawn so that the tube outer diameter portion DR at the position D is drawn at a position centered on the intersection d moved further to the left on the CR and X axes.
Draw at different positions along the X axis rather than on the same coaxial line.

As a result, these pipe outer diameter portions AR, BR,
Are partially overlapped with each other so that the partially curved surfaces 23a, 23b, 23c, 23d,... Forming a part of these tube outer diameter portions AR, BR, CR, DR,. Since a parabolic curved surface is formed, the entire curved surface of the concave groove 22 of the roll guide 21 is formed based on the parabolic curved surface.

The parabolic curved surface shown in FIG. 5 has four tapered tube outer diameter portions AR, BR, CR,
Partial curved surfaces 23a, 23b, 23 in DR
Although c and 23d are shown as having a continuous shape, in practice, the curved surface shown in FIG. An even smoother parabolic curved surface is formed.

[0017]

In the taper pipe bending apparatus according to the present invention, the roll guide 21 is used as a means for bending the taper pipe 10, and the curved surface of the concave groove 22 of the roll guide 21 is formed at a plurality of positions in the taper pipe 1. Outer diameter part AR,
Are formed by combining a plurality of partial curved surfaces 23a, 23b, 23c, 23d,... That conform to the curved surfaces of BR, CR, DR,. When brought into contact, roll guide 2
One concave groove 22 is composed of a plurality of synthesized partial curved surfaces 23.
a, 23b, 23c, 23d,... are in contact with the curved surfaces of the outer diameter portions AR, BR, CR, DR,. To rotate the roll guide 21 about the shaft 14 to make the tapered tube 1
When a bending force is applied to 0, the respective partially curved surfaces 23a, 23b, 23c, 23d adapted to the outer diameter of the tapered tube 10 are provided.
.. Allows the tapered tube 1 to be appropriately and smoothly bent over a predetermined length.

Even if there is only one roll guide 21, the roll guide 21 rotates along the bending die 11, so that the partially curved surfaces 23 a, 23 b, 23 c, 23 of the roll guide groove 22 are formed.
d, the corresponding outer diameter portions AR,
BR, CR, DR ... can be bent,
As shown in the embodiment, when the two roll guides 21 are mounted on the bearings 20 which are rotatably swung by the pins 19 at the tips of the guide dampers 18, the tapered tube 1
0 at two points by the two roll guide grooves 22,
By moving the guide damper 18 with the hydraulic cylinder 24, each roll guide 21 becomes a respective partial curved surface 23.
a, 23b, 23c, 23d,... and the corresponding outer diameter portions AR, BR, CR, DR,... of the taper tube are simultaneously pressed with a uniform force. Various bending processes such as composite R bending and parabolic R bending can be performed efficiently and without difficulty.

In the apparatus of the present invention, the roll guide 2
A plurality of partial curved surfaces 23a, 23b, 23c, 2 that fit into one concave groove 22 and a part of the outer diameter curved surface of the tapered tube 10.
3d... Do not require a long guide rail having a tapered groove of a predetermined length corresponding to the outer diameter of the tapered tube as in the conventional device of this type. Bending can be performed on different tapered pipes with different diameters and taper ratios without changing the roll guide, which has much better advantages in terms of workability and cost than conventional bending equipment. .

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a bending apparatus according to the present invention.

FIG. 2 is a side view of a main part of the bending apparatus in a state where the rotary base of FIG. 1 is rotated.

FIG. 3 is a sectional view showing a configuration of a roll guide device.

FIG. 4 is a sectional view showing a plurality of outer diameter portions of a tapered tube which is a reference for forming a concave groove of a roll guide.

FIG. 5 is a design diagram for forming a concave groove of a roll guide into a parabolic curved surface based on the sectional view of FIG. 4;

FIG. 6 is a plan view showing a configuration of a conventional taper pipe bending apparatus.

FIG. 7 is a perspective view of a guide rail provided in the apparatus of FIG.

[Explanation of symbols]

 10: Taper tube 11: Bending mold 12: Fixed base 13: Rotating base 14: Shaft 15: Bending mold concave groove 16: Mold member 17: Roll guide device 18: Guide damper 19: Pin 20: Bearing 21: Roll guide 22: Roll guide groove 23a, 23b ...: Partially curved surface 24: Hydraulic cylinder

Claims (2)

[Claims] 1. A bending die for bending a tapered tube into a predetermined shape, and a roll guide that rotates while pressing the tapered tube attached to the bending die along the bending die by a rotating base. And the concave groove curved surface of the roll guide is formed by a parabolic curved surface obtained by combining a plurality of partial curved surfaces having different curvatures that match the outer diameter portion curved surfaces at a plurality of positions in the tapered tube. Bending equipment for tapered pipes. 2. A roll guide device having a bearing rotatable in the left-right direction via a pin is provided at a tip of a guide damper on a rotary base, and at least a pair of right and left roll guides are provided on the same plane of the roll guide device. 2. The taper pipe bending apparatus according to claim 1, wherein the shaft is rotatably mounted.