JP2000176551A - Bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effect acute bending and bending work of a work thicker than the maximum thickness in a specification and to eliminate bulging in a corner part by attaching a V-groove die unit in the bosom part of a bend beam over the entire length in the lateral direction and forming a V-groove along the entire length of the bending line of the work on a bottom die by pressing with a top die. SOLUTION: The work W is positioned in the Y-axis direction and the V- groove die 5 is downward rotating with a piston rod 8 and positioned in a working position. By working a manipulator 34, the clamped work W is positioned in the position of the bending line M. By lowering the top die and pressing the V-groove die 5, the V-groove 41 is formed over the entire length of the bending line M. In the bending work, the V-groove die 5 is retreated so as to get out of the way, the work W is positioned in the bending position M, the work W is clamped with the top die and bottom die 21, the bend beam 1 is rotationally moved and the work is bent with a positive bending die 3. Because the V-groove 41 is worked, the acute bending and bending of the work thicker than the maximum thickness in the specification are enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus, in particular, to facilitate bending of a work by processing a V-groove, thereby enabling an acute angle bending, and a bending work of a work having a thickness exceeding a specified maximum thickness. Further, the present invention relates to a bending apparatus that eliminates bulges at corners.

[0002]

2. Description of the Related Art Conventionally, when mass-producing products by automatically bending a workpiece, a panel bender called an ironing bending machine has been used.

This panel bender has, for example, the configuration shown in FIG. 10, clamps a work W with a top die 31 and a bottom die 32 as holding dies, and vertically moves a bend beam 33 as a bending die. Thereby, the work W is bent.

The bend beam 33 is formed by a reverse bending mold 33.
A and a forward bending mold 33B.
(See FIG. 10).

[0005]

However, the conventional panel vendor shown in FIG. 10 has the following problems.

That is, in a conventional panel vendor, when performing an acute angle bending, in order to make the work W bend easily,
A V-groove 50 (FIG. 11A) is previously formed in the work W.

In a conventional panel bender, when bending a workpiece having a thickness greater than a specified maximum thickness, for example, a panel bender having a maximum workpiece thickness of 2.3 mm for a work W that can be processed has a thickness of 2. 5 mm (the workpiece W of FIG. 11B may be bent.

In this case as well, a V-groove 50 (FIG. 11B) is previously formed in the work W in order to make the work W easy to bend.

Further, in a conventional panel bender, when processing a panel (FIG. 11C), the bend beam 3
In the lower part of the pressing traces 51 and 52 (FIG. 11C) of FIG. 3 (FIG. 10), the corners are swollen.

Therefore, in this case as well, a V-groove is previously formed in the work W in order to make the work W easy to bend.

However, in order to machine the V-groove 50 (FIGS. 11 (A) and 11 (B)), a V-cut machine is required, and other than the bending machine called the panel bender (FIG. 10). In order to prepare a V-cut machine,
Processing efficiency is undesirably reduced.

An object of the present invention is to provide a V-groove processing function to make it easy to bend a work, enable an acute angle bend, and make it possible to bend a work having a thickness greater than a specified maximum plate thickness. Provided is a bending device that eliminates swelling.

[0013]

According to the present invention, as shown in FIGS. 1 to 9, a V-groove mold unit is provided at a foot 1A of a bend beam 1 in the left-right direction. A bending machine (1) which is mounted over the entire length and presses the V-groove mold unit with the top die 20 to form the V-groove 41 along the entire length of the bending line M of the work W on the bottom die 21 ( 1 to 3),
A cross-shaped V-groove mold unit is movably attached in the left-right direction to the bead portion 1A of the bend beam 1, and the cross-shaped V-groove mold unit is positioned in the left-right direction and pressed by the top die 20 so that the bottom die 21 is pressed. A bending process characterized in that V-grooves 43, 44, 46, 47 are formed at corners where the bending lines M2 and M3, M2 and M4 of the upper workpiece W intersect, and V-grooves 42, 45 are formed at the bending line M1. A V-cut bite unit is mounted on the device (FIGS. 4 to 6) and at the bend of the bend beam so as to be movable in the left-right direction. The work on the bottom die is held by the auxiliary top die attached to the top die. A bending apparatus (FIGS. 7 to 9) characterized in that a V-groove is cut along the entire length of a bending line of the work by moving a bite unit. Technical means have been taken.

According to this configuration, the bending device can be provided with a V-groove processing function, so that the work can be easily bent, an acute angle bending can be performed, and a work having a thickness greater than a specified maximum plate thickness can be processed. In addition, the swelling of the corner can be eliminated.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings according to embodiments. FIG. 1 shows the first embodiment of the present invention.
FIG. 1 is an overall view showing an embodiment.

The bending apparatus shown in FIG. 1 has a bend beam 1, which has a forward bending die 3 and a reverse bending die 2, as described above (FIG. 10). The work W is bent up and down.

A V-groove mold unit is attached to the end portion 1A of the bend beam 1 over the entire length in the left-right direction (X-axis direction). The V-groove mold unit is composed of a V-groove mold 5 and a base plate 6. Have been.

The V-groove die 5 is mounted on the lower surface of the front portion of the base plate 6 over its entire length. As will be described later (FIG. 2A), after positioning the V-groove die 5 at the processing position, the base plate 6 is pressed by the top die 20 so that the work W on the bottom die 21
1 (the lower left view in FIGS. 1 and 2A) is formed.

The base plate 6 is rotatably mounted on both sides of the base plate 6 via hinges 9 via hinges 9, and is connected via hinges 10 to the piston rod 8 of the swivel cylinder 4 mounted behind the bend beam 1. Are combined.

With this configuration, by operating the turning cylinder 4, the V-groove die 5 attached to the base plate 6 is moved to the V-groove processing position (FIG. 2A) and the retracted position (FIG. 2A). (B)).

That is, in FIG. 2, when performing the V-groove machining, the V-groove die 5 is turned counterclockwise to be positioned at the machining position (FIG. 2A), and the V-groove machining is completed. Then, when performing normal bending, it turns clockwise and is positioned at the retracted position (FIG. 2B).

On the other hand, a top die 20 and a bottom die 21 (FIG. 2) are installed in front of the bend beam 1, and a front table 22 and a manipulator 34 are further arranged ahead (FIG. 1).

As is well known, the manipulator 34 has a C-axis 35 including an upper turret 36 and a lower turret 37, and the work W is clamped and positioned by the C-axis 35. I have.

Hereinafter, the operation of the first embodiment of the present invention having the above configuration will be described with reference to FIG.

(1) V-groove processing operation. First, in step 101 of FIG. 3, the workpiece W is positioned in the Y-axis direction, and in step 102, the V-groove mold 5 is turned downward to be positioned at the processing position.

That is, the bending line M of the work W (FIG. 1) is predetermined, and according to the present embodiment, the V-groove 41 is formed along the entire length of the bending line M.

Therefore, the manipulator 34 is operated to position the workpiece W clamped by the C-axis 35 at the position of the bending line M in the Y-axis direction.

Next, the turning cylinder 4 is operated to
The groove die 5 is turned downward, for example, in a counterclockwise direction (FIG. 2A), and positioned at the processing position.

In this state, in step 103 of FIG. 3, the top die 20 is lowered, and the V-groove mold 5 is pressed.
In step 104, the V groove 41 is formed along the entire length of the bending line M.

When the V-groove mold 5 is positioned at the processing position (FIG. 2A), since the V-groove mold 5 is in contact with the work W, when the top die 20 is lowered, the top die is lowered. 20 strikes against the base plate 6, whereby the V-groove mold 5 is pressed.

As a result, the pressed V groove mold 5 (FIG. 1) forms the V groove 41 along the entire length of the bending line M.

Next, in step 105 of FIG.
The top die 20 is raised, and in step 106,
The V-groove mold 5 is turned upward and positioned at the retracted position.

That is, when the V-groove 41 is formed, the top die 20 is raised and the turning cylinder 4
To turn the V-groove mold 5 upward, for example, clockwise (FIG. 2B), to position it in the retracted position.

(2) Bending operation.

Next, in step 107 of FIG. 3, bending is performed.

That is, in step 106, the V-groove mold 5 is retracted so as not to hinder the bending, so that the work W is positioned at the predetermined bending position M by the manipulator 34 as in the prior art (FIG. 2 (B)). )), The work W is clamped by the top die 20 and the bottom die 21,
By turning the bend beam 1, a forward bending process is performed by the forward bending die 3.

In this case, as described above, the V-groove 41 is formed along the entire length of the bending line M (FIG. 1), so that the work becomes easy to bend, an acute angle bending can be performed, and the thickness is equal to or more than the specified maximum plate thickness. Work can be bent.

FIG. 4 is an overall view showing a second embodiment of the present invention.

The bending apparatus shown in FIG. 4 has a bend beam 1 similarly to FIG. 1, and the bend beam 1 has a forward bending die 3 and a reverse bending die 2, and holds the workpiece W up and down. Iron and bend.

A cruciform V-groove mold unit is movably mounted in the left and right direction (X-axis direction) at the foot 1A of the bend beam 1. The cruciform V-groove mold unit is a cruciform V-groove. It comprises a mold 11, a base plate 12 and a moving plate 15.

The cross-shaped V-groove mold 11 is used for the base plate 1.
2 is attached to the lower surface of the front part, as described later (FIG. 5).
(A)), after positioning the cruciform V-groove mold 11 at the processing position, pressing the base plate 12 with the top die 20, the V-groove 45 or the like on the work W on the bottom die 21 (FIGS. 4 and 5 ( A) (lower left figure) is formed.

The cross-shaped V-groove mold 11 is formed such that the V-groove molds 11A, 11B, 11C, and 11D cross each other when viewed from the back surface (lower right diagram in FIG. 5A).

With the configuration of the cross-shaped V-groove mold 11, when the cross-shaped V-groove mold 11 is positioned on the right side of the work W (the position of the bending line M3), the bending line is formed by the V-groove mold 11A. V-grooves 42 are formed along M1 (lower left view of FIG. 5A), and V-grooves 43 and 44 are formed at corners where bending lines M2 and M3 intersect by V-groove dies 11A and 11B (FIG. 5A). ) Lower left figure) Forming process respectively.

Further, when the cross-shaped V-groove mold 11 is positioned on the left side of the work W (position of the bending line M4), the V-groove 45 is formed along the bending line M1 by the V-groove mold 11D.
(Lower left view of FIG. 5A), and V-groove molds 11D and 11D.
C, V-shaped grooves 46 and 47 are formed at the corners where the bending lines M2 and M4 intersect (lower left view in FIG. 5A).

The base plate 12 includes a hinge 23
It is pivotally attached to the moving plate 15 via (FIGS. 4 and 5), and is connected to the rotary cylinder 16.

With this configuration, by operating the rotary cylinder 16, the cross-shaped V-groove die 11 attached to the base plate 12 moves the V-groove processing position (FIG. 5A) and the retracted position (FIG. 5A). 5 (B)).

That is, in FIG.
Is turned counterclockwise when performing V-groove machining and is positioned at the machining position (FIG. 5 (A)). When V-groove machining is completed and normal bending is performed, clockwise rotation is performed. (FIG. 5 (B)).

The moving plate 15 has a nut 13 and a slider 14 (FIGS. 4 and 5).

The nut 1 of the moving plate 15
3 is screwed into a ball screw 17, and the ball screw 17
One end is connected to a servomotor 18 attached to the bend beam 1 via a bracket 19, and the other end is supported by a bearing block 26.

The slider 14 of the moving plate 15
Are slidingly connected to a guide rail 24 laid on the bend beam 1.

With this configuration, if the servo motor 18 (FIG. 4) is operated, the cross-shaped V-groove mold 11 can be positioned at a predetermined position in the left-right direction (X-axis direction).
As described above, the bending line M
The V groove 42 and the like (FIGS. 4 and 5A) are formed along 1 and the like.

On the other hand, in front of the bend beam 1, a top die 20 and a bottom die 21 (FIG. 5) are set in the same manner as in FIG. 1, and further in front thereof, a front table 22 and a manipulator 34 are arranged. W is clamped for positioning.

The operation of the second embodiment of the present invention having the above configuration will be described below with reference to FIG.

(1) V-groove processing operation. In this case, first, the right V-grooves 42 and 4 of the workpiece W
3 and 44 are formed (FIGS. 4 and 5A).
Next, it is assumed that the left V-grooves 45 and 46 and 47 of the work W are formed (FIG. 4, FIG. 5A, lower left diagram).

(1) -A V-groove 42 on the right side of work W,
And forming of 43 and 44.

(1) -A-1 Forming of the V-shaped groove 42.

First, in step 201 of FIG. 6, the work W is positioned in the Y-axis direction. In step 202, it is determined whether or not the positioning of the cross-shaped V-groove mold 11 in the X-axis direction is necessary. If yes (YES), step 20
Go to step 3; if not necessary (NO), go to step 204.

That is, the bending line M1 of the workpiece W (the lower left diagram in FIGS. 4 and 5A) is predetermined, and according to the present embodiment, first, the V-groove 42 is formed along the bending line M1. Is processed.

Therefore, the manipulator 34 is operated to position the workpiece W clamped by the C-axis 35 at the position of the bending line M1 in the Y-axis direction.

Since the cross-shaped V-groove mold 11 has not been initially positioned in the X-axis direction, the flow advances to step 203 to position the cross-shaped V-groove mold 11 at the X-axis direction bending line M3. Position.

Next, in step 204, the cross-shaped V-groove mold 11 is turned downward to be positioned at the processing position.
In step 205, final positioning is performed with the bend beam 1. In step 206, the top die 20 is lowered and the cross-shaped V-groove mold 11 is pressed, and in step 207, the V-groove 42 is formed along the bending line M 1. Process.

That is, by operating the rotary cylinder 16 (FIG. 4), the cross-shaped V-groove mold 11 is turned downward, for example, in a counterclockwise direction (FIG. 5A), and positioned at the processing position. If the final position is determined by the bend beam 1, the cross-shaped V
The groove mold 11 contacts the work W.

Accordingly, when the top die 20 is lowered in this state, the top die 20 abuts against the base plate 12, whereby the cross-shaped V-groove mold 11 is pressed.

As a result, the pressed cross-shaped V-groove mold 11
(FIGS. 4 and 5 (A)), the V-groove mold 11A (lower right view of FIG. 5 (B)) along the bending line M1 along the V-groove 42
Is processed.

Next, in step 208 of FIG.
The top die 20 is raised, and in step 209,
The bend beam 1 is raised. You.

That is, when the V-groove 42 (the lower left diagram in FIGS. 4 and 5A) is formed, the top die 20 is raised and the bend beam 1 is raised to form the cross-shaped V-groove mold 1.
Release 1 from work W.

Next, in step 210, it is determined whether or not the V-groove machining has been completed.
O) Returning to step 201, if it is completed, proceed to step 211.

In this case, in this embodiment, since the V-groove processing has not been completed, the process returns to step 201.

(1) -A-2 Forming of the V-shaped grooves 43 and 44.

In step 201, the work W is positioned in the Y-axis direction up to the position of the bending line M2 (the lower left diagram in FIGS. 4 and 5A).
It is determined that the positioning of the groove mold 11 in the X-axis direction is unnecessary, and the process proceeds to step 204.

That is, V grooves 43 and 44 to be formed this time
(The position of the bending line M3) is the same as the position of the V-groove 42 formed last time. Therefore, it is unnecessary to newly position the cross-shaped V-groove mold 11 in the X-axis direction. is there.

In this case, after the work W is positioned in the Y-axis direction, the cross-shaped V-groove mold 11 is
The upper workpiece W is positioned above a corner where the bending lines M2 and M3 intersect (FIG. 4).

Therefore, in step 204, the cross-shaped V-groove mold 11 is turned downward to be positioned at the processing position (FIG. 5).
(A)), in step 205, the cross-shaped V-groove mold 11 is finally positioned by the bend beam 1, and in step 206, the top die 20 is lowered and the cross-shaped V-groove mold 11 is pressed. V along the bending lines M2 and M3
The grooves 43 and 44 are formed.

In other words, the pressed cross-shaped V-groove mold 1
Reference numeral 1 (FIGS. 4 and 5A) shows the V-groove molds 11A and 11A.
B (lower right view of FIG. 5B) forms V-grooves 43 and 44 at corners where bending lines M2 and M3 intersect.

Next, in step 208 of FIG.
The top die 20 is raised, and in step 209,
The bend beam 1 is raised to release the cross-shaped V-groove mold 11 from the work W, and in step 210, it is determined whether or not the V-groove processing has been completed.

In this case, in this embodiment, the V-groove machining has not been completed yet (N in step 210 in FIG. 6).
O), returning to step 201, the V-grooves 45, 46 and 47 on the left side of the work W are formed this time.

(1) -B V groove 45 on the left side of the work W,
And processing of 46 and 47.

(1) -B-1 Forming of V-shaped groove 45 In this case, it is the same as (1) -A-1.

That is, in the previous operation, ((1) -A-
2) At the stage where the V-grooves 43 and 44 on the right side of the work W are formed (lower left diagrams in FIGS. 4 and 5A), the work W is located at the position of the bending line M2 in the Y-axis direction. Positioned.

Therefore, in step 201 of FIG.
Position the work W at the position of the bending line M1 in the Y-axis direction,
In step 202, it is determined that the positioning of the cross-shaped V-groove mold 11 in the X-axis direction is necessary (YES), and the flow advances to step 203 to move the cross-shaped V-groove mold 11 to the position of the X-axis direction bending line M4. (FIGS. 4 and 5A).

Next, in step 204, the cross-shaped V-groove mold 11 is turned downward to be positioned at the processing position.
In step 205, final positioning is performed with the bend beam 1. In step 206, the top die 20 is lowered and the cross-shaped V-groove mold 11 is pressed, and in step 207, the V-groove 45 is formed along the bending line M 1. Process.

Thereafter, in step 208 of FIG.
The top die 20 is raised, and in step 209,
The bend beam 1 is raised.

Then, in step 210, it is determined that the V-groove processing has not been completed yet (NO), and step 2
Return to 01.

(1) -B-2 Forming of the V-shaped grooves 46 and 47. In this case, it is the same as (1) -A-2.

That is, in the previous operation, ((1) -B-
1) At the stage where the V-groove 45 on the left side of the work W is formed (FIG. 4, lower left diagram of FIG. 5A), the work W
It is positioned at the position of the bending line M1 in the Y-axis direction.

Therefore, in step 201 of FIG.
Position the work W at the position of the bending line M2 in the Y-axis direction,
In step 202, it is determined that the positioning of the cross-shaped V-groove mold 11 in the X-axis direction is unnecessary (NO), and the process proceeds to step 204.

Then, in step 204, the cross-shaped V-groove mold 11 is turned downward to be positioned at the processing position.
In step 205, final positioning is performed with the bend beam 1. In step 206, the top die 20 is lowered and the cross-shaped V-groove mold 11 is pressed, and in step 207, the V-groove 46 is formed along the bending lines M 2 and M 4. , 47 are formed.

Thereafter, in step 208 of FIG.
The top die 20 is raised, and in step 209,
The bend beam 1 is raised.

Next, at step 210, it is determined whether or not the V-groove machining has been completed, and as described above ((FIG. 4, FIG. 5 (A), lower left diagram)), in this embodiment,
Since the forming of the V-grooves 42 to 47 has been completed (YE
S), proceed to step 211.

(2) Bending operation.

Next, at step 211, the cross-shaped V
After the groove mold 11 is turned upward and positioned at the retracted position, in step 212, bending is performed.

That is, the work W is controlled by the manipulator 34.
(FIG. 5 (B)), the workpiece W is clamped by the top die 20 and the bottom die 21 and the bend beam 1 is turned to make a forward bending by the forward bending die 3. Perform processing.

In this case, the V-grooves 43, 44, 46 and 47 are formed at the corners where the bending lines M2 and M3, and M2 and M4 of the work W intersect as described above (FIG. 5B). (Lower right figure), the swelling of the corner has disappeared.

FIG. 7 is an overall view showing a third embodiment of the present invention.

The bending apparatus shown in FIG. 7 has a bend beam 1 similarly to FIG. 1, and the bend beam 1 has a forward bending die 3 and a reverse bending die 2, and holds the workpiece W up and down. Iron and bend.

A V-cut bit unit is attached to the bead portion 1A of the bend beam 1 so as to be movable in the left-right direction (X-axis direction). The V-cut bit unit is composed of a V-cut bit 27, a base plate 29, and a moving plate. 72.

The V cut bite 27 is used for the base plate 2
9 and is moved in the X-axis direction (FIG. 7) to cut the V groove 48 over the entire length of the bending line M of the work W.

The base plate 6 is pivotally attached to the movable plate 72 via a hinge 78 (FIGS. 7 and 8), and is connected to the rotary cylinder 28 (FIG. 7).

By operating the rotary cylinder 28 with this configuration, the V cut bite 27 attached to the base plate 29 is moved to the V groove processing position (FIG. 8A) and the retracted position (FIG. 8B). )).

That is, in FIG.
Is turned counterclockwise when performing V-groove processing and is positioned at the processing position (FIG. 8A). When V-groove processing is completed and normal bending is performed, clockwise rotation is performed. And is positioned at the retracted position (FIG. 8B).

The moving plate 72 has a nut 71 and a slider 79 (FIGS. 7 and 8).

The nut 7 of the moving plate 72
1 is screwed into a ball screw 73, and the ball screw 73 is
One end is connected to a servomotor 74 attached to the bend beam 1 via a bracket 81, and the other end is supported by a bearing block 80.

The slider 79 of the moving plate 72
Are slidingly connected to a guide rail 75 laid on the bend beam 1.

Further, a vacuum pipe 76 is attached to the moving plate 72, and the V-cut bit 27 sucks chips 77 generated by cutting the V-groove 48.

With this configuration, if the servo motor 74 (FIG. 7) is operated, the V-cut tool 27 can be positioned at a predetermined position in the left-right direction (X-axis direction).
After being positioned at the processing position by the rotary cylinder 16, the V-cut tool 27 is moved in the X-axis direction while the work W is being pressed by the auxiliary top die 60 (FIG. 8A) described later (FIG. 7). ), V-groove 4 along bending line M
8 is machined.

The chips 77 generated at that time are sucked by the vacuum pipe 76.

On the other hand, in front of the bend beam 1, a top die 20 and a bottom die 21 (FIG. 8) are set in the same manner as in FIG. 1, and further in front thereof, a front table 22 and a manipulator 34 are arranged. W is clamped for positioning.

Above the top die 20, an auxiliary top die 60 is provided.
(A)), the auxiliary top die 60 is mounted on the top die 20 to hold the work W.

That is, when the work W is pressed down by the normal top die 20, the work W is pressed down by using the auxiliary top die 60 because the top die 20 interferes with the V-cut tool 27 to which the top die 20 moves.

Hereinafter, the operation of the third embodiment of the present invention having the above configuration will be described with reference to FIG.

(1) V-groove processing operation. First, in step 301 of FIG. 9, the workpiece W is positioned in the Y-axis direction. In step 302, the V-cut tool 27 is positioned in the X-axis direction. Position.

That is, the bending line M of the work W (FIG. 7) is predetermined, and according to the present embodiment, the V-groove 48 is cut along the entire length of the bending line M.

Therefore, the manipulator 34 is operated to position the workpiece W clamped by the C-axis 35 at the position of the bending line M in the Y-axis direction.

Next, the servo motor 74 is operated to
The cutting tool 27 is positioned in the X-axis direction, the rotary cylinder 28 is operated, and the V-cut tool 27 is turned downward, for example, counterclockwise (FIG. 8A), and positioned at the processing position.

In this state, in step 304 of FIG. 9, the auxiliary top die 60 is mounted on the top die 20, and the work W is pressed. In step 305, the V-cut tool 27 is moved in the X-axis direction. The V-groove 48 is cut along the entire length of the bending line M, and the chips 77 generated during the cutting are sucked. I do.

That is, when the V-cut bit 27 is positioned at the processing position (FIG. 8A), the V-cut bit 27 is in contact with the workpiece W.

Therefore, the auxiliary top die 60 (FIG. 8)
(A)) is mounted on the top die 20, the work W is pressed, and in this state, the servomotor 74 (FIG. 9) is operated to move the V cut bite 27 in the X-axis direction. The V groove 48 is cut along.

In the meantime, the generated chips 77 (FIG. 7) are sucked by the vacuum pipe 76.

Next, in step 307 of FIG.
The auxiliary top die 60 is retracted, the top die 20 is raised, and in step 308, the V cut bite 27 is turned upward to be positioned at the retracted position.

That is, when the V-groove 48 is cut, the auxiliary top die 60 is retracted upward away from the top die 20, the top die 20 is raised, and the rotary cylinder 28 is operated again to make the V-cut. The cutting tool 27 is turned upward, for example, clockwise (FIG. 8B), and positioned at the retracted position.

(2) Bending operation.

Next, in step 309 of FIG. 3, bending is performed.

That is, in order not to hinder the bending process,
In step 307, the auxiliary top die 60 is retracted, and in step 308, the V-cut tool 27 is retracted.
4, the work W is positioned at a predetermined bending position M (FIG. 8B), the work W is clamped by the top die 20 and the bottom die 21, and the bend beam 1 is turned to make a forward bending die 3. To perform normal bending.

In this case, as described above, the V-groove 48 is cut along the entire length of the bending line M (FIG. 7), so that the work becomes easy to bend, an acute angle bending can be performed, and the specified thickness or more is exceeded. Work can be bent.

[0125]

As described above, according to the present invention, by providing a V-groove processing function, the work can be easily bent, an acute angle bending can be performed, and a work having a specified thickness or more can be bent. The present invention has the technical effect of providing a bending apparatus capable of making possible and eliminating the bulge of the corner portion.

[0126]

[Brief description of the drawings]

FIG. 1 is an overall view showing a first embodiment of the present invention.

FIG. 2 is an operation explanatory view of FIG. 1;

FIG. 3 is a flowchart illustrating the operation of FIG. 1;

FIG. 4 is an overall view showing a second embodiment of the present invention.

FIG. 5 is an operation explanatory view of FIG. 4;

FIG. 6 is a flowchart illustrating the operation of FIG. 4;

FIG. 7 is an overall view showing a third embodiment of the present invention.

FIG. 8 is an operation explanatory view of FIG. 7;

FIG. 9 is a flowchart illustrating the operation of FIG. 7;

FIG. 10 is a diagram illustrating a configuration of a conventional technique.

FIG. 11 is a diagram for explaining a problem of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bend beam 1A Flange part 2 Reverse bending die 3 Forward bending die 4 Turning cylinder 5 V groove die 6 Base plate 7 Mounting member 8 Piston rod 9, 10 Hinge 20 Top die 21 Bottom die 22 Front table 34 Manipulator 35 C axis 36 Upper turret 37 Lower turret W Work

Claims (9)

[Claims] 1. A V-groove mold unit is attached to the bend beam at the foot thereof over the entire length in the left-right direction, and the V-groove mold unit is pressed by a top die, so as to extend along the entire bending line of the work on the bottom die. A bending apparatus for forming a V-groove. 2. The bending apparatus according to claim 1, wherein the V-groove mold unit is connected to a turning cylinder and turns between a processing position and a retracted position. 3. A cross-shaped V is provided at the end of the bend beam.
The groove mold unit is movably mounted in the left-right direction, and the cross-shaped V-groove mold unit is positioned in the left-right direction and pressed by the top die, so that the V at the corner where the bending line of the work W on the bottom die crosses. A bending apparatus for forming a V-groove in a groove and a bending line. 4. The bending apparatus according to claim 3, wherein the V-shaped cross-shaped mold unit is screwed to a ball screw rotated by a servomotor and is slidably connected to a guide rail. 5. The bending apparatus according to claim 3, wherein the cross-shaped V-groove mold unit is connected to a rotary cylinder and pivots between a processing position and a retracted position. 6. A V-cut bite unit is movably attached to the bend beam in the lateral direction, and the work on the bottom die is pressed by an auxiliary top die mounted on the top die to move the V-cut bite unit. A bending machine for cutting the V-groove along the entire length of the bending line of the work. 7. The bending apparatus according to claim 6, wherein the V cut bite unit is screwed to a ball screw rotated by a servomotor and is slidably connected to a guide rail. 8. The bending apparatus according to claim 6, wherein the V-cut bite unit is connected to a rotary cylinder and turns between a processing position and a retracted position. 9. The bending apparatus according to claim 6, further comprising a vacuum pipe for sucking chips generated by the cutting of the V-cut bite unit.