JPH11314118A - Pipe bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously bend plural places the radii of curvatures of which are different with one pipe bending machine even it is a pipe having comparatively large cross-sectional area, or more specifically with the bending machine by stretching- bending method. SOLUTION: This device is provided with a fixed bending die 1 a recessed part for matching a pipe to its outer peripheral part of which is provided and which is freely rotatably held, variable width clamp die 8 which is arranged on the side from which the pipe is inserted, with which the pipe is rotated pressing and clamping it at the time of bending the pipe by being paired with the fixed bending die 1, movable press die 15 for guiding the pipe which is arranged at the farther side of the clamp die 8 and in an approximatey adjacent relation to the clamp die, pipe position fixing and moving mechanism 19 and control mechanism for bending-related equipment of the fixed bending die 1, clamp die 8, press die 15 for guiding the pipe and pipe position fixing and moving mechanism 19 or the like. In this way, although the machine is based on the stretching-bending method, the bending of not only the pipe having a smaller radius but the pipe having a larger radius is executable, consequently plural places of different radii of curvatures are continuously efficiently bendable.

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 for bending a pipe by a bending method, which can continuously form a large curvature (large R) and a small curvature (small R). .

[0002]

2. Description of the Related Art For example, as shown in FIG.
(With a diameter of 90 mm) at a predetermined location with a radius of 16
When trying to bend with a curvature of 000 millimeters (R16000) and a radius of 120 millimeters (R120),
Generally known pull bending method, compression bending method,
Applying the press bending method (above single radius bending method), the tension bending method, the CNC bending method, and the roll bending method (above compound radius bending method),
Molding of 120 was possible, but not R16000, or ~ molding of R16000 was possible but R120 was not. That is, particularly in a pipe having a relatively large cross-sectional area, deformation such as crushing may occur unless an appropriate construction method is applied depending on the curvature of a bent portion.

Therefore, conventionally, one pipe is connected to a plurality of places,
In the case where bending is to be performed while largely changing the curvature, large R forming is performed by, for example, a press bending method, and small R forming is performed by, for example, a pull bending method. For this reason, not only must the pipe bending apparatus be arranged as necessary, but also, naturally, the number of steps and setup man-hours have increased, and the costs associated with the generation of intermediate products have increased.

[0004]

SUMMARY OF THE INVENTION Accordingly, the object of the present invention is to solve the above-mentioned problems. A pipe having a relatively large cross-sectional area can be bent by a single pipe bending apparatus, specifically, by a bending method. It is an object of the present invention to provide a pipe bending apparatus which can continuously bend a plurality of places having different curvatures.

[0005]

A pipe bending apparatus according to the present invention for solving the above-mentioned problems comprises a fixed bending die rotatably held with a concave portion for attaching a pipe on an outer peripheral portion, and a bending die of the bending die. It is arranged on the pipe insertion side, and turns while pressing and holding the pipe when bending the pipe in pair with the fixed bending mold,
A tightening mold having a variable tightening width, a movable pipe guide holding mold disposed at a position deeper than and substantially adjacent to the tightening mold, and a pipe position fixing and moving mechanism; A control mechanism for bending-related equipment such as the fixed bending die, the clamping die, the pipe guiding holding die, and the pipe position fixing and moving mechanism is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to FIGS. Reference numeral 1 denotes a fixed bending die in which a bending portion 3 is exchangeably fixed to an upper end of a support portion 2 rotatably held on a base plate B, and a straight line for attaching a pipe T to an outer periphery of the bending portion 3. A concave portion 3a (on the pipe insertion side) and a curved concave portion 3b following the concave portion 3a are formed, and a lever 4 is welded below the support portion 2 and its tip is connected to the tip of a rod 6 of a cylinder 5 by a pin 7. I have.

Reference numeral 8 denotes a clamping die, which is provided on the side of the fixed bending die 1 where the pipe is inserted, that is, on the side of the straight concave portion 3a so as to face the bending die part 3, and forms a pair with the fixed bending die 1. In order to be able to press and pinch and rotate the pipe T when bending the pipe, a concave portion 8a for attaching the pipe T is formed on the fixed bending die 1 side, and the opposite side is formed on the support portion 2 of the fixed bending die 1. It is fixed to the end of the rod 11 of the cylinder 10 supported by the support arm 9. In the drawing, reference numeral 12 denotes a roller, which is disposed at the tip of the clamping die 8 (see FIG. 4), that is, on the insertion side of the pipe T (on the right side in FIG. 1), as shown in FIGS.
It is supported by a support piece 13 and a pin 14, and has a pipe T on its outer periphery similarly to the recess 8 a of the clamping die 8.
Is formed. The clamping die may be configured so that at least the concave portion 8'a matches the curvature of the pipe T as shown as 8 'in FIG.

Reference numeral 15 denotes a holding die for guiding the pipe, which is disposed deeper than the clamping die 8, that is, on the left side in FIG. 1, substantially adjacent to the clamping die 8. Has a pipe T
Is formed, and the opposite side is fixed to an end of a rod 18 of a cylinder 17 movably provided on a guide 16 fixed on a base plate B in parallel to a pipe T insertion direction. ing.

Reference numeral 19 denotes a pipe position fixing / moving mechanism, which comprises a cylinder 21 fixed on a base plate B via a support 20 and a contact portion 23 attached to a tip of a rod 22 of the cylinder 21. Numeral 24 denotes an electronic controller which controls the electromagnetic valves 25, 26, 27 and 28 for taking the working fluid into and out of the cylinders 5, 10, 17 and 21 in accordance with the flow charts shown in FIGS. It has a function of controlling and changing the amount of the working fluid to start, stop, and change the operating speed of the cylinders 5, 10, 17, and 21 as instructed. 29 is a working fluid conduit.

Reference numeral 30 denotes a three-dimensional bending and torsion correcting mechanism particularly suitable for correcting the deformed pipe T 'shown in FIGS. 15 and 17, which is disposed at the tip end of the clamping die 8 (see FIG. 5). For example, as shown in FIGS. 14 and 15, the lower end is supported by a pin (not shown) so as to rotate at right angles to the insertion direction of the pipes T and T ′. The support plates 31, 31 'supported by bolts 34 sandwich the splittable suppression frames 33, 33' filled with a suppression member 32 surrounding the pipe T 'as shown in FIG. 31 ′ and the restraining frames 33, 3
The arm 35 fixed to 3 ′ is configured to be rotated by a cylinder 36 via a rod 37.
The torsional direction and the amount of bending of the deformed pipe T ′ of No. 5 are determined in advance by experiments, and after mass bending in mass production,
Pass the pipe T 'through the three-dimensional bending and twist correction mechanism 30,
By actuating the cylinder 36 in such a way that the amount of twist occurs in a direction opposite to the direction of the twist determined experimentally, the twist caused by bending is corrected. In the drawing, reference numeral 37 denotes a mandrel to be inserted into the pipes T and T '.

Next, the operation of forming a large R and a small R in a pipe by the pipe bending apparatus of the present invention will be described with reference to FIG.
11 to FIG. 11, FIG. 18, and FIG. First, as an initial state, the clamping die 8 and the pipe guiding holding die 15 are opened, the bending die portion 3 of the fixed bending die 1 is set at an angle of 0, and the mandrel 38 is advanced if necessary into the pipe T. insert. Further, the contact portion 23 of the pipe position fixing and moving mechanism 19 is retracted to a predetermined position (step S1). In this state, a straight pipe T is inserted as shown by an arrow until it comes into contact with the contact portion 23 as shown in FIG. 6 (step S2).

Next, as shown in FIG. 6, the holding die 15 for guiding the pipe is tightened, and the clamping die 8 is half-opened in accordance with the large radius of curvature (step S3). Further, the bending die 3 of the fixed bending die 1 is rotated by an angle α degrees as shown by the arrow. Then, the clamping die 8 also rotates by the same angle as shown in FIG.
Is slightly bent (step 4). Here, the rod 22 is extended by operating the cylinder 21 of the pipe position fixing and moving mechanism 19, and the pipe T is pushed rightward as shown by the arrow in FIG. As a result, large R bending can be performed (step S6).

If the clamping die 8 and the pipe guide holding die 15 are released (step S7), the large R bending is completed (step S8). If the small R bending is not performed (step S9), the pipe may be taken out (step S1).
0).

When performing small R bending, it is necessary to consider whether or not it is necessary to set the bending die portion 3 of the fixed bending die 1 at an angle of 0 (step S11). 9
Then, the bending die portion 3 of the fixed bending die 1 is returned to the angle 0 as shown by the arrow (step S12). Further, the bending mold part 3 is set at an angle of 0
The same applies to the case where it is not necessary), the pipe guide holding die 15 is tightened as shown in FIG. 9, and the tightening die 8 is tightened according to the curvature of the small R (step S13).

Here, if necessary, while extending the rod 22 to push the pipe T to the point where the small R is formed, and while moving the pipe guide holding die 15 as shown by the arrow in FIG. The bending mold part 3 of the fixed bending mold 1
It rotates by an angle β degrees as indicated by the arrow in FIG. Then, the clamping die 8 also rotates by the same angle, and the tip of the pipe T is bent by a predetermined small R (step 14). If the pipe T has been bent at the small radius R, the mandrel 38, if any, is retracted and removed from the inside of the pipe T (step S15), and the clamping mold 8 and the pipe guiding holding mold 15 are opened (step S15). S
16) The pipe T in which the large R and the small R are formed can be taken out.

In the above process, in the embodiment, the clamping die 8 is used.
Since the roller 12 is disposed at the end of the pipe T, that is, on the insertion side (the right side in FIG. 1) of the pipe T, the pipe T moves while the clamping die 8 is fastened and is tightened when bending the large and small R. When the mold 8 rotates, the pipe T comes into contact with the roller by friction, and the large and small R are smoothly bent. This can be achieved to some extent by changing the fastening fitting 8 to a fitting 8 'adapted to the curvature of the pipe as shown in FIG.

When the pipe is, for example, a deformed pipe T 'and is twisted after bending a large or small R, FIG.
5, a three-dimensional bending and torsion correcting mechanism 3 for pipe T '
By operating the cylinder 36 so that the amount of torsion is generated in the direction opposite to the torsion direction determined by the experiment, the torsion caused by bending can be corrected.

[0018]

According to the present invention, there is provided a pipe bending apparatus comprising: a fixed bending die rotatably provided with a concave portion for attaching a pipe to an outer peripheral portion; and a fixed bending die disposed on a pipe insertion side of the bending die. A pair of molds, which presses and clamps the pipe when bending the pipe and rotates, a clamping mold having a variable clamping width, and is disposed at a position deeper than and substantially adjacent to the clamping mold, A movable pipe guide holding die, a pipe position fixing and moving mechanism,
The fixed bending mold, a clamping mold, a holding mold for pipe guide,
It is equipped with a control mechanism for bending related equipment such as a pipe position fixing and moving mechanism, so that not only a small R but also a large R can be bent depending on the pull bending method. There is an effect that it is possible to provide an efficient pipe bending apparatus that can be bent at a time.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of a pipe bending apparatus of the present invention.

FIG. 2 is a schematic front view of an embodiment of the pipe bending apparatus according to the present invention.

FIG. 3 is a diagram showing a main part structure and an operation mode of a basic embodiment of the pipe bending apparatus of the present invention.

FIG. 4 is a diagram showing a main part structure and an operation mode of the pipe bending apparatus of the present invention shown in FIGS. 1 and 2;

FIG. 5 is a diagram showing a main part structure and an operation mode of another embodiment of the pipe bending apparatus of the present invention.

FIG. 6 is a view showing a main part structure and an initial state of the pipe bending apparatus of the present invention shown in FIG. 4;

FIG. 7 is a view showing a main part structure and an initial operation mode of the pipe bending apparatus of the present invention shown in FIG. 4;

FIG. 8 is a diagram showing a main part structure and a large R bending operation mode of the pipe bending apparatus of the present invention shown in FIG. 4;

FIG. 9 is a diagram showing a main structure of the pipe bending apparatus of the present invention shown in FIG. 4, an end of a large R bending operation, and a preparation mode of a small R bending.

FIG. 10 is a view showing a main part structure and a small R bending operation mode of the pipe bending apparatus of the present invention shown in FIG. 4;

FIG. 11 is a view showing a main part structure and a bending operation mode of the pipe bending apparatus of the present invention using a clamping die in another mode.

FIG. 12 is a partially omitted plan view showing the vicinity of a clamping die of the pipe bending apparatus of the present invention shown in FIGS. 1 and 2;

FIG. 13 is a view taken in the direction of arrow A in FIG. 12;

FIG. 14 is a partially omitted perspective view of a three-dimensional bending and torsion correcting mechanism of the pipe bending apparatus of the present invention.

15 is a cross-sectional view of the suppression frame of the three-dimensional bending and torsion correcting mechanism shown in FIG. 14 and the inside thereof.

FIG. 16 is a diagram showing a bent state of a pipe.

FIG. 17 is a cross-sectional view of an example of a deformed pipe.

FIG. 18 shows the first half of a flowchart for instructing the operation order of the pipe bending apparatus of the present invention.

FIG. 19 shows the latter half of the flowchart for instructing the operation order of the pipe bending apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fixed bending type 2 Support part 3 Bending type part 4
Lever 5,10,17,21,36 Cylinder 6,11,18,22,37 Rod 7,14 Pin 8 Tightening die 9 Support arm 12 Roller 13 Supporting piece 15 Pipe guide holding die 16 Guide 19 Pipe position Fixed and moving mechanism 20 support
DESCRIPTION OF SYMBOLS 23 Contact part 24 Electronic controller 25, 26, 27, 28 Solenoid valve 29 Pipe for working fluid 30 Three-dimensional bending and twist correction mechanism 31, 31 'Support plate 32 Suppression member 33, 3
3 'restraint frame 34 bolt 35 arm 38 mandrel
B Base plate T pipe T 'Deformed pipe.

Claims (3)

[Claims] 1. A fixed bending die rotatably held with a concave portion for accommodating a pipe on an outer peripheral portion, and a fixed bending die disposed on a pipe insertion side of the bending die and paired with the fixed bending die. A clamping die having a variable clamping width, which rotates while pressing and holding a pipe during bending, and a movable pipe guide retainer disposed deeper than and substantially adjacent to the clamping die. A mold, a pipe position fixing and moving mechanism, the fixed bending mold, a clamping mold,
A pipe bending apparatus comprising a control mechanism for bending related equipment such as a pipe guide holding die and a pipe position fixing / moving mechanism. 2. The pipe bending apparatus according to claim 1, wherein a roller mechanism is provided at an end of the clamping die. 3. The pipe bending apparatus according to claim 1, wherein a three-dimensional bending and torsion correcting mechanism is provided at a position of a tip of the clamping die.