JPH039807B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for processing vehicle brake pipes, lubricating oil and fuel supply pipes, etc. The present invention relates to a pipe processing machine suitable for processing pipes having a plurality of bending points including bends with small bending diameters.

[Conventional technology]

BACKGROUND ART Conventionally, bending of pipes such as brake pipes, lubricating oil pipes, and fuel pipes has been carried out using a pipe bender, or by attaching a mold for pipe bending to an ordinary press.

[Problems to be solved by the invention] By the way, with conventional pipe benders, the pipe can only be bent at one point in a single processing operation.
If there are multiple bends in one pipe,
It is necessary to prepare multiple pipe benders and assign a worker to each pipe bender to install and adjust the workpiece, which increases equipment costs, requires a large space, and a large number of workers. The disadvantage was that it took a long time to process.

It may be possible to use an NC pipe bender to reduce manpower and shorten work time, but if the pipe has even one bent part that has already been machined, the NC bender's chuck will not be able to grip it.

On the other hand, presses can bend multiple locations at once, but if the bending angle becomes steep or the bending radius becomes small, the pipe may break or the pipe deformation rate at the bending location (pipe diameter, cross-sectional area There was a problem that the % decrease) became too large to be of practical use.

The present invention was developed as a result of extensive research in view of the drawbacks of the prior art, and requires multiple bending points at the end of the pipe, including bends with steep bending angles and small bending diameters. An object of the present invention is to provide a pipe processing machine capable of bending a pipe with one device and in one processing step.

[Means for solving problems]

FIG. 1 is a perspective view showing the main parts of the pipe processing machine according to the present invention. In the figure, 16 is a lower mold having a mold groove 21, 18 is a rotatable bending table adjacent to the lower mold, and 52 is a table. The main body, 54 is a slider with a groove 68, 84 is a compression coil spring that biases the slider 54 in the direction of the lower mold 16, 14 is a box frame that guides the lower mold to move up and down, and 48 biases the lower mold 16 upward. Compression coil spring 86 is an upper mold having a mold groove 90, 100
is a curved part.

[Effect]

A straight pipe 22 is attached to the lower die 16 and the bend table 18.
When the upper mold 86 is lowered with the mold placed thereon, the lower mold 16 moves downward against the compression coil spring 48, and at this time, the pressing action of the lower mold 16 and the upper mold 86 causes the mold grooves 21, 90 to be pressed. The pipe 22 is bent according to the following.

In addition, when the pipe 22 is sandwiched between the upper mold 86 and the lower mold 16, the upper mold 86 may be moved downward or the pipe 22 may be moved downward.
2, bending table 1 of pipe 22
When the side 8 moves clockwise in FIG. 2, the slider 54 of the bending table 18 rotates along the tube axis at the end of the pipe 22 and moves from near the bending point D to between the pipe 22 perpendicularly to the tube axis. Apply force to perform the bending motion, which causes the upper mold 8 to be attached to the end of the pipe.
The bending process is performed according to the curved portion 100 of No. 6 with a large bending angle and a small bending diameter.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pipe processing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a partially omitted perspective view showing the overall configuration of a pipe processing machine. In the figure, a box-shaped base 12 is mounted on the upper side of a machine top plate 10, and a box frame 14 for guiding a lower mold is provided on this base 12.

The box frame 14 has a rectangular shape when viewed from above, and has a lower mold 16 that can be slid in the vertical direction inside, and a bending table 18 provided adjacent to the outside of one end of the lower mold 16. It is equipped.

The lower mold 16 has an upper surface 20 formed in a predetermined chevron shape with mold grooves 21 having, for example, three bending points A, B, and C. It is possible to process and form bent portions 24, 26, 28 (see FIG. 6) having bending diameters and bending locations.

Each bent portion 24, 26, 28 has a gentle bending angle,
It has a large bending radius and can be sufficiently bent using a press.

The mold groove 21 has a vertical cross section that is obtained by dividing the inner diameter of the pipe 22 in half, which is slightly larger than the outer diameter.

A lower mold mounting plate 36 inscribed on three sides of the box frame 14 is attached to the lower surface of the lower mold 16.

Inside the box frame 14, there are provided four guide protrusions 32 that protrude inward and extend vertically along the inner wall. The guide protrusions 32 fit into four guide grooves 34 drilled in the side surfaces of the holder 36, and guide the vertical movement.

A guide portion of the lower mold 16 is formed by the box frame, the guide projection 32, and the guide groove 34.

Two support rods 38 are fixed to the lower side of the lower die mounting plate 36. This support rod 38 is
It extends downward from the lower mold mounting plate 36 and is attached to the box frame 1.
4 and the upper plate 42 of the base 12 in a slidable manner.

The lower end of the support rod 38 is attached to the movable plate 41. A leg rod 44 is fixed to the lower center of the movable plate 41.
extends downward and slidably passes through the machine top plate 10.

A double nut stopper 46 is attached to the lower end of the leg rod 44. A compression coil spring 48 as a biasing means is interposed between the movable plate 41 and the machine top plate 10, and constantly biases the movable plate 41 and the lower die 16 attached to the movable plate 41 upward. ing.

However, the upward movement of the lower die 16 is limited by the stopper 46 coming into contact with the machine top plate 10, and the point where the top surface 20A of the lower die 16 is substantially flush with the upper surface 14A of the box frame 14 is the upward return position. becomes.

Conversely, the downward movement of the lower mold 16 is restricted by the lower mold mounting plate 36 coming into contact with the bottom plate 40 of the box frame 14.

The bending table 18 is the first part of the lower die 16 that has returned upward.
The bending stand 18 is provided on the left side in the figure, and the bending stand 18 is provided on the stand main body 52 which is rotatably supported on the box frame 14 by a shaft 50.
A slider 54 is provided so as to be slidable in a direction perpendicular to the rotation axis.

The base body 52 is formed into a substantially P-shape in which the upper part of a horizontal cylinder is cut out in a plane, and the cutout surface 52A extends to the left in FIG. The base body 52 can rotate up and down around an axis, and the upward rotation is limited by the slider 54 being in contact with the upper mold 86, as will be described later, and the downward rotation is limited by the slider 54 being in contact with the upper mold 86. The protruding portion 60 of the stand body 52 comes into contact with a stopper 58 provided below the stand body 52, so that it is restricted.

When the protruding portion 60 comes into contact with the stopper 58, the cut surface 52A of the stand main body 52 becomes horizontal and returns to the return position.

The slider 54 is connected to the slider 54 and the base body 52.
Guided by dovetail portions 62 and 64 formed in , it is possible to slide linearly (in the direction of the lower die 16 when the base body 52 is in the returned state) on the cut surface 52A.

The slider 54 has a wedge-shaped upper surface 54A that is gently sloped, and the tip on the lower die 16 side forms an arcuate portion 66.

A groove 68 is formed in the upper surface 54A of the slider 54 from the circular arc portion 66 to the center. This groove 6
8 is provided in a straight line along the upper surface 54A, and has a longitudinal cross section in which the inner diameter, which is slightly larger than the outer diameter of the pipe 22, is divided in half, similar to the mold groove 21.

From the center of the upper surface 54A of the slider 54 to the lower mold 16
A rod-shaped magnet 70, which is larger in diameter than the pipe 22, is placed horizontally near the end opposite to the pipe 22 so as to embed the lower half thereof. The tip of the magnet 70 is exposed in the groove 68.

This magnet 70 is attached to the tip of a position adjustment bolt 72. A support plate 73 that protrudes upward is fixed to the end of the slider 54, and the position adjustment bolt 72 is screwed into a nut 74 attached to the support plate 73, so that the magnet 70 can be moved in the direction of the groove 68. It's becoming like that.

A support plate 76 protruding upward is fixed to the end of the protrusion 60 of the base body 52, and a spring force adjustment bolt 80 is screwed into a nut 78 attached to the support plate 76, so that the length of the cut surface 52A is fixed. It is now possible to move in any direction.

A spring seat 82 is provided at the tip of the spring force adjustment bolt 80, and the spring seat 82 and the slider 54
A compression coil spring 84 as a biasing means is interposed between the support plate 73 attached to the support plate 73, and constantly biases the slider 54 toward the right side in FIG. 1 toward the lower mold 16.

When the base body 52 is in a state in which it has returned to rotation downward, the top surface 54A of the slider 54 is at approximately the same height as the top surface 14A of the box frame 14.

An upper mold 86 is disposed above the lower mold 16 so as to face the lower mold 16, and is mounted on an air cylinder (not shown) serving as a lifting means to perform a lifting operation.

This upper mold 86 has a lower surface 88 side that is in the opposite shape to the upper surface 20 of the lower mold 16 except for the left end in FIG. ，
Mold groove 9 with three bending points C' and point D, which is a 1/4 arc bending point at the lower left end.
It is formed in an inverted chevron shape with a zero.

This makes it possible to process and form four bent portions 24, 26, 28 and 92 having predetermined bending diameters and bending angles on the pipe 22 to be processed (see FIG. 6).

The lower left corner of the upper mold 86 is formed into a 1/4 arc shape, and one end of the pipe 22 can be bent by 90 degrees at this curved part 100 to form the bent part 92. ing.

The bent portion 92 has a steep bending angle and a small bending radius, making it unsuitable for press working. However, in this embodiment, the bending work is gradually performed by the bending operation of the bend table 18, so that good working quality can be obtained.

Like the mold groove 21, the mold groove 90 has a vertical section obtained by dividing the inner diameter of the pipe 22 in half, which is slightly larger than the outer diameter of the pipe 22.

Four guide grooves 94 are bored in the side surface of the upper mold 86, similar to the guide grooves 94 formed in the lower mold 16 and the lower mold mounting plate 36, so that the upper mold 86 can be attached to the box frame 1.
4, the guide protrusion 32 fits into the guide groove 94 to guide vertical movement.

Next, the overall operation of the above embodiment will be explained.

The upper mold 86 is waiting in advance at a predetermined position above.
On the other hand, the lower mold 16 is in the upward return position where the stopper 46 abuts against the machine top plate 10 due to the action of the compression coil spring 48, and the bending table 18 is located at the lower position where the protrusion 60 abuts against the stopper 58 (contrary to FIG. 2). It is assumed that the rotation has returned in the clockwise direction. At this time, the tip of the slider 54 comes into contact with the side surface 16B of the lower die 16 due to the action of the compression coil spring 84.

First, a predetermined work supply device (see Figure 2)
96 is operated, and the straight thin pipe 22 is placed on the mold groove 21 between B and C of the lower mold 16 and on the groove 68 of the slider 54.

At this time, the left end of the pipe 22 in FIG. 2 is magnetically attached to the magnet 70 to position the pipe 22 in the left-right direction and to prevent displacement.

Next, the air cylinder is operated and the upper mold 86 is lowered.

When the upper mold 86 descends and comes to the lower mold 16, first, the mold groove 90 of the upper mold 86 is located at D- on the left side in FIG.
Point E between points A' and the lower right end presses the pipe 22 downward.

When the lower mold 16 receives a pushing force from the upper mold 86 via the pipe 22, it resists the biasing force of the compression coil spring 48 and escapes downward. The pipe 22 is deformed by the upward biasing force of the compression coil spring 48 and the downward pushing force of the upper die 86, leaving the area between B and C of the lower die 16 horizontal, and moving the left side of point B and the right side of point C downward. Can be bent.

In parallel with this, with the left end of the pipe 22 resting on the slider 54, the upper mold 86 is
A′ presses the pipe 22 downward, so an upward reaction force acts on the left end of the pipe 22.
The slider 54 side is bent upward, leaving the space -A' horizontal.

The pipe 22 bends along the curve of the mold groove 90 of the upper mold 86 at point D.

At this time, since the stand main body 52 is rotatable, the pipe 2
The moment generated by the force received from the left end of the pipe 2 rotates the bending table 18 clockwise in FIG.

Therefore, the left end of the pipe 22 is connected to the slider 5.
4, it is always subjected to a large pressing force in a direction perpendicular to the tube axis, and smooth bending operation is achieved.

When the bending table 18 rotates clockwise from the state shown in FIG. While moving to the left in FIG. 3, the tip of the slider 54 remains in contact with the end of the lower mold 16.

As a result, the right end of the slider 54 is maintained at a position close to the bending point D, and while the bend table 18 is allowed to rotate, the slider 54 moves the left end of the pipe 22 from a position close to the bending point D of the upper die 86. Pressure can be applied in a direction perpendicular to the axis, allowing bending with a small bending diameter and low pipe deformation rate.

Further, the slider 54 also moves on the base body 52 when receiving a pressing force component in the tube axis direction from the left end of the pipe 22 during the machining operation. This allows pipe 22
It is possible to prevent unnecessary reaction force from being applied from the slider 54 to the slider 54, thereby preventing deformation or damage caused by operations other than the required bending process.

As the upper mold 86 further descends, the bending process of the pipe 22 progresses due to the press action between it and the lower mold 16 and the bending action received from the bending table 18, and finally the upper mold 56 and the lower mold 16 as shown in FIG. Fit together.

At this time, the pipe 22 is processed into a shape that follows the space formed by the mold grooves 21 and 90 of the upper mold 86 and the lower mold 16 except for the point D of the upper mold 88, so that the bent portions 24, 26, and 28 of the pipe 22 are It's done.

Further, as the upper mold 86 descends, the bending table 18 further rotates clockwise in FIG. bend in the direction.

The tip of the slider 54 contacts the upper mold 86, and is pressed by the upper mold 86 and slides on the base body 52 to the upper left in FIG. 4, while keeping the right end of the slider 54 close to the bending point D. , pipe 2
2 from a position close to bending point D.
Press between the tips of 2 in a direction perpendicular to the tube axis.

Then, when the lower die mounting plate 36 comes into contact with the bottom plate 40 of the box frame 14, the upper die 86 stops descending, and during this time the bending table 18 rotates almost vertically, and as shown in FIG. The force causes the left end of the pipe 22 to bend vertically.

The slider 54 moves downward on the base body 52 under the biasing force of the compression coil spring 84, and the entire upper surface 54A abuts the lower end of the side surface of the upper die 86.

In this way, three bent portions 24, 26, and 28 with relatively gentle bending angles and large bending radii are formed by the pressing action of the upper die 86 and the lower die 16.

On the other hand, a bent portion 92 with a relatively steep bending angle and a small bending radius is formed by the bending action of the bending table 18 on the pipe 22 held between the upper die 86 and the lower die 16. There is no risk of large scratches or abrasions that would occur when attempting to form the material by descending the press.

The lower mold mounting plate 36 contacts the bottom plate 40 and the upper mold 8
After the lowering of the mold 6 stops, the upper mold 86 rises.
At this time, due to the urging force of the compression coil spring 48, the lower mold 1
6. The pipe 22 also rises together. Therefore, the left end of the pipe 22 pushes up the slider 54, and the entire bending table 18 rotates counterclockwise in FIG. 5.

The left end of the pipe 22 is the slider 54.
After it is removed from the magnet 70, it further rotates counterclockwise due to counterclockwise rotational inertia, the reaction force moment that the tip of the slider 54 receives when it comes into contact with the lower mold 16, and the self-weight moment of the bending table 18.
The stopper 46 comes into contact with the machine top plate 10 and the lower die 1
6 stops at the upper return position, the protruding portion 60 of the bending table 18 also comes into contact with the stopper 58, and returns to the lower return position.

When the upper die 86 rises to the predetermined upward return position, the processed pipe 22 is fitted into the lower die 16 as shown in FIG. Operation, pipe 22
is dropped onto a tray (not shown).

In this way, according to this embodiment, it is possible to form a plurality of bending points with gentle bending angles in the pipe 22 between the lower mold 16 and the upper mold 86 with the mold grooves 21 and 90, and also to A bend stand 18 is provided adjacent to the outside, and the bend stand 18 is rotatably supported, and the bend stand 18 is connected to a stand body 52 and a slider 54 slidably provided on the stand body 52. Since the slider 54 is configured to include a compression coil spring 84 that biases the slider 54 in the direction of the lower mold 16, when the slider 54 receives a pressing force from the left end of the pipe 22 placed on the lower mold 16 as the upper mold 86 descends, the slider 54 rotates greatly toward the curved portion 100 of the upper die 86, thereby forming a bending point with a large bending angle on the pipe 22.

Moreover, the tip of the slider 54 is a compression coil spring 8.
4, the pipe 22 is always kept close to the bending point D, so the pipe 22 can be pressed from near the bending point D to bend the bending diameter to a small size, and an excessive moment can be prevented from being applied near the bending point D. The rate of deformation of the diameter and cross-sectional area of the pipe 22 can be minimized.

Then, with one pipe processing machine, the end of the pipe is
Pipe processing at multiple bends, including bends with steep bend angles and small bend radii, can be performed in one step.

In addition, since straight pipes can be used as material, it is possible to automatically feed workpieces, and by combining it with an appropriate workpiece retrieval device, it is possible to obtain more than 600 workpieces per hour.

Furthermore, since the bender work is performed on the end of the pipe while it is being held between the upper and lower molds, the chuck work that is required as a preparatory work in normal bender work is performed by a press, and this is why special A chuck device is not required, and since the pipe is bent in the groove, the workpiece is fixed more firmly than with a general chuck, improving the machining dimensional accuracy of bender work.

In addition, in the above embodiment, the case where the pipe is bent only in the plane of the front view shown in FIG. It may also be configured to include a bending component on the plan view (see pipe 220 in FIGS. 1 and 2).

〔Effect of the invention〕

As explained above, according to the present invention, the upper mold with a mold groove is lowered relative to the lower mold with a mold groove, and the lower mold and the upper mold form a plurality of bending points with gentle bending angles on the pipe. In addition, when the upper mold is lowered in the same process, the slider of the bending table rotates greatly toward the curved part of the upper mold due to the pressing force from the end of the pipe placed on the lower mold, and this causes the pipe to bend. Bending points with large bending angles can be formed.

Moreover, because the tip of the slider is always kept close to the bending point by the action of the biasing means, the bending diameter can be reduced by pressing the pipe from near the bending point, and an excessive moment is not applied to the bending point. The rate of deformation of the pipe can be minimized by blocking it.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted perspective view showing the main parts of a pipe processing machine according to an embodiment of the present invention, and FIGS. 2 to 6 are explanatory diagrams of the operation of the pipe processing machine shown in FIG. FIG. 7 is a diagram showing another example of processing, in which 1 is a front view of the pipe, and 2 is a plan view of 1. 14...Box frame, 16...Lower die, 18...Bend stand, 21,68,90...Groove, 22,220...
Pipe, 48...Compression coil spring, 52...Base body, 54...Slider, 84...Compression coil spring, 86...Upper mold, 100...Bending portion.

Claims (1)

[Claims] 1. An upper die and a lower die in which die grooves for pipe bending are formed on opposing surfaces, a guide part that guides the lower die movably downward from a predetermined upward return position, and a biasing part that urges the lower die upward. a lifting means for raising and lowering the upper mold relative to the lower mold, a curved part with a mold groove provided at the lower end corner of the upper mold, and adjacent to the outside of one end side of the lower mold opposite to the curved part. and a bending table which is rotatably supported by the bending table; A pipe processing machine characterized by comprising a biasing means for biasing.