JPH06114452A - Buckling bending device of tube - Google Patents

Abstract

PURPOSE:To execute a buckling bending with a proper radius of curvature by moving a 1st member to the lateral direction so that a top end of an abutting member rotating following to the rotation of a 3rd member is always positioned within a 1st groove bending surface. CONSTITUTION:The 1st member 1 and the 2nd member 2 are moved to the rear side while supporting a tube a, and the tube a is held with clamping between a/2nd groove bending surface 42 and a 3rd groove bending surface 43. The 3rd member 3 is rotated while sinking the rear surface of tube a by facing inside the 1st groove bending surface 41 with the top end of abutting member 31. In the same time, the tube a is bent with buckling by rotating the 2nd member 2. At that time, the 1st member 1 is slid to the lateral direction so that the top end of the abutting member 31 is always positioned within the 1st groove bending surface 41. In such a way, a frame, etc., of complicated shape can be easily machined and formed with a single device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe bending apparatus applicable to the manufacture of automobile seat frames and furniture frames.

[0002]

2. Description of the Related Art Conventionally, most bending processes of pipes are bender processes using an arbitrary fulcrum as a base point, and in some special cases, bending of seats is performed. In the buckling process, both ends of the workpiece are held by supports, and the pipe is locally deformed and bent when the central portion is pressed by a straight presser from a direction perpendicular to the two supporting points.

[0003]

However, in the bending process, when the curvature becomes 1.5 times or less of the pipe diameter, there is a problem that the distraction ratio outside the bent portion becomes large and the pipe is broken. Further, in the seat bending treatment, there is a problem in that the inside of the bent portion protrudes laterally, so that the diameter becomes partially thick.

[0004]

The present invention has been proposed in view of the above, and a first member and a first member having a first groove curved surface and a second groove curved surface into which the pipe is fitted are dug from the front side of the pipe. A pipe bending device including two members facing each other and a third member formed by projecting an abutting member having a diameter smaller than the diameter of the pipe from the rear surface side of the pipe. From the rear surface side of the pipe, the abutment material is inserted and fixed to a fixing material having a third groove curved surface into which the pipe is fitted so that its tip is located on the side of the third groove curved surface. Is joined to the upper surface of a disk material having a rotation axis, the first member and the second member are moved rearward while supporting the pipe, and the pipe is clamped between the second groove curved surface and the third groove curved surface. The third member is held while the tip of the abutting member faces the first groove curved surface and the rear surface of the pipe is depressed. The pipe is bent by rotating and rotating the second member, and at that time, the tip of the abutting member that rotates with the rotation of the third member is always positioned in the first groove curved surface. The present invention relates to a bending device for a pipe, wherein one member is slid laterally.

[0005]

Since the pipe bending apparatus of the present invention has the above-mentioned structure, it can be appropriately bent by bending. In the process of bending the seat, since the inside of the bent portion is prevented from protruding laterally by the first groove curved surface, the diameter is not partially increased.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of the drawings.

The pipe bending apparatus of the present invention will be summarized as follows.
From the front surface side of the pipe a, the first member 1 and the second member 2 having the first groove curved surface 41 and the second groove curved surface 42 into which the pipe a is fitted are faced, and contacted from the rear surface side of the pipe a. This is a configuration in which the third member 3 formed by projecting the material 31 is faced.

The first member 1 has a semi-circular first groove curved surface 41 having an inner diameter substantially equal to the outer diameter of the pipe a on one long side surface (rear surface) of a long metal member. Is excavated and is configured to be movable in the front-rear direction and the lateral direction by a drive mechanism (not shown).

The second member 2 is formed by digging a second groove curved surface 42, which is substantially the same as the first groove curved surface 41, on one side surface (rear surface) of a short metal member, and is moved forward and backward by a drive mechanism (not shown). It is movable in the direction and rotatable.

The third member 3 is composed of a thick disk material 32 having a rotary shaft 321 and a fixing material 33 joined to the upper surface of the disk material 32.

In the illustrated embodiment, fixing holes 322 and 323 are provided on the upper surface of the disk member 32. Further, a third groove curved surface 43 which is substantially equal to the first groove curved surface 41 is dug on one side surface (front surface) of the substantially rectangular column in the fixing member 33, and the third groove curved surface 43 which is notched at one corner is inserted into the fixing member 33. The insertion hole 332 is formed, and the stop hole 333 is formed from the upper surface to the inside to form the insertion hole 3
It is in communication with 32. The pipe a is inserted into the insertion hole 332.
A substantially cylindrical contact member 31 having a diameter smaller than the diameter is inserted. In the illustrated embodiment, the contact member 31 has a shape in which a flat surface 311 is formed by grinding the upper surface of a cylindrical rod member, and the insertion hole 332 also has a cross-sectional shape substantially equal to the cross-sectional shape of the contact member 31. In the state where the contact member 31 is inserted, the contact member 31 cannot rotate. Then, the length is adjusted by the male screw portion 312 and the nut 313 provided at the base end of the abutting member 31, and a stopper (not shown) is inserted into the stopper hole 333 and brought into contact with the flat surface portion 311 and tightened. The contact member 31 is integrally fixed to the fixing member 33. Also, the fixing material 3
3, through holes 334, 335 communicating with the fixing holes 322, 323 of the disk member 32 are provided, and the fixing tools 336, 3 are provided.
The fixing member 33 is integrally fixed to the disc member 32 at 37.

Buckling of a pipe using the pipe bending apparatus of the present invention composed of the first member 1, the second member 2 and the third member 3 thus formed will be described below.

First, as shown in FIG. 2, the first member 1 and the second member
The member 2 is arranged side by side in the lateral direction, and the first groove curved surface 41 and the second groove curved surface 42 are continuous in the lateral direction. Each groove curved surface 4 in this state
While supporting the front surface (lower surface in the drawing) of the long pipe a supplied by 1, 42 (right to left in the drawing), the pipe is moved backward (upward in the drawing). A third member 3 rotatably fixed is arranged at the rear (upper side in the drawing), and the fixing member 33
The third groove curved surface 43 and the tip of the contact member 31 face.

Next, as shown in FIG. 3, the first member 1 is further added.
When the second member 2 is moved rearward (upward in the drawing), the rear surface (upper surface in the drawing) of the pipe a is the third groove curved surface 43.
And the pipe a is connected to the second groove curved surface 42 and the third groove curved surface 43.
And a holding pressure between them and the tip of the contact member 31 causes the rear surface (upper surface in the drawing) of the pipe a to be depressed.

In this state, the third member 3 is rotated as shown in FIG. Further, along with this rotation, the first member 1 is moved laterally (to the left in the drawing), and the second member 2 is moved.
Is rotated so that the pipe a is always held between the second groove curved surface 42 and the third groove curved surface 43 under pressure. When each member is driven in this manner, the first member 1 is continuously moved to the pipe a.
Since the outside of the bent portion of the pipe a is not extended, the tip of the abutting member 31 is recessed inside and the pipe a is bent. Moreover, since the tip of the abutting member 31 is always located in the first groove curved surface 41 of the first member 1, both inner surfaces of the pipe a are lateral (front and back surfaces in the drawing).
There is no protrusion.

After obtaining a predetermined bending angle as shown in FIG. 5, the first member 1 and the second member 2 may be separated from the pipe a.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-mentioned embodiments, and may be carried out in any manner unless the configuration described in the claims is changed. You can

[0018]

Since the pipe bending apparatus of the present invention does not extend the outside of the bent portion, the first groove curved surface prevents the inside of the bent portion from protruding laterally without damaging the portion. Therefore, the diameter is not partially increased, and the seat bending process can be performed with an appropriate curvature. Further, it is possible to easily process and mold an automobile seat frame, a furniture frame, or the like having a complicated shape by one device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a pipe bending device that is an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which a pipe is bent and bent.

FIG. 3 is a plan view showing a state in which a pipe is bent and bent.

FIG. 4 is a plan view showing a state where the pipe is bent and bent.

FIG. 5 is a plan view showing a state in which a pipe is bent and bent.

6 is a cross-sectional view of FIG.

[Explanation of symbols]

 1 1st member 2 2nd member 3 3rd member 31 Abutting material 32 Disc material 321 Rotating shaft 33 Fixing material 41 1st groove curved surface 42 2nd groove curved surface 43 3rd groove curved surface a Pipe

Claims (1)

[Claims] 1. A first member and a second member having a first groove curved surface and a second groove curved surface into which the pipe is fitted are faced from the front side of the pipe, and the diameter of the pipe is smaller than the rear surface side of the pipe. Is a pipe bending device facing a third member formed by projecting an abutting member having a small diameter, the third member digging a third groove curved surface into which the pipe is fitted from the rear surface side of the pipe. The abutting member is inserted and fixed to the fixed member so that the tip of the abutting member is located on the side of the curved surface of the third groove, and the fixing member is joined to the upper surface of the disk member having the rotating shaft. The first member and the second member are moved backward while supporting the pipe, the pipe is clamped and held between the second groove curved surface and the third groove curved surface, and the tip of the abutting member is placed in the first groove curved surface. By rotating the third member while rotating the second member while the rear surface of the pipe is depressed, The first member is laterally slid so that the tip of the abutting member that rotates with the rotation of the third member is always located in the curved surface of the first groove. A bending device for pipes.