JP2000233225A - Bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and efficient bending device capable of precisely positioning a work. SOLUTION: A die 1 provided with a V-groove 1a in a horizontal direction and punch 2 having a tip part 2a facing the V-groove 1a are provided, and the punch 2 is provided freely movably forward and backward to/from the die 1 by a servomotor 8. A back gage 9 which is located below the die 1 and punch 2 is provided freely vertically movably by a servomotor 12 and the work W is placed on the top surface 9a of the back gage 9 whose top surface 9a is made into a plane by gravity. By the servomotor 8 being a positioning mechanism, the punch 2 is stopped in the vicinity of a position where the work W is not pressurized and, by vertically moving the material W to be worked with the back gage 9, the bending position of the work W is positioned between the die 1 and the punch 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus for bending a flat plate.

[0002]

2. Description of the Related Art In a conventional bending apparatus shown in FIG. 6, a detachable die 22 is provided above a die holder 21, and a V extending in the Y-axis direction is provided on the upper surface of the die 22.
A groove 22a is provided. A punch holder 24 is disposed above the die 22 in the vertical direction (Z-axis direction), and the detachable punch 23 has a V-shaped tip portion 23a.
Is installed facing down. The punch 23 is provided with a hydraulic device (not shown), a clutch,
Driven in the Z-axis direction by a press machine such as a servomotor, the tip 23a of the punch 23 and the V-groove 22a of the die 22 are formed.
Are combined so that pressure can be applied. The back gauge 25 strikes the workpiece W of a flat plate and
Is positioned between the V-groove 22a of the die 22 and the tip 23a of the punch 23. The punch 23 is positioned behind the punch 23 and the die 22 in the X direction. The back gauge 25 is provided so as to be drivable in the vertical direction (X-axis direction) in which the punch 23 and the die 22 approach, and the side surface 25a of the back gauge 25 abuts against the workpiece W (abutting surface). ((Product name, RG-80S, press brake) A
MADA catalog 91D3-01).

Next, a description will be given of a processing step in a conventional bending apparatus.
When driven by a servo motor (not shown) in the vertical direction (X-axis direction) with respect to the die 3 and the die 22 through a ball screw (not shown), and the workpiece W made of a flat plate material is applied to the side surface 25a of the back gauge 25, The workpiece W is stopped at a position where the bending position of the workpiece W is on a line connecting the tip 23a of the punch 23 and the V groove 22a of the die 22.

[0004] In the second step, the workpiece W is applied to the side surface 25 a of the back gauge 25 driven and stopped in the first step, and the bending position of the workpiece W is changed to the tip 2 of the punch 23.
3a is held between the V groove 22a of the die 22.

In the third step, the punch 23 is lowered from above the workpiece W, and the die 2 fixed below the punch 23 is moved downward.
Then, the workpiece W is sandwiched between the die 2 and the pressurizing unit 2, and a bending process is performed at the V groove 22 a of the die 22 and the tip 23 a of the punch 23.

In the fourth step, after the bending is completed,
The punch 23 is raised, and the bent workpiece is taken out by hand.

[0007]

In the conventional bending apparatus, the side surface of the workpiece W is applied to the side surface 25a of the back gauge 25 by hand, and the punch 23 is lowered from the upper side, so that the punching device 23 and the die 22 are moved downward. The workpiece W was pressed and bent. According to this method, when bending the workpiece W, the workpiece W bent between the punch 23 and the die 22 or in the processing.
There was a risk that the hand would be caught between the punch 23 and the hand.

Furthermore, according to the conventional method of bending the workpiece W by applying the side surface of the workpiece W to the side face 25a of the back gauge 25, when the workpiece W is manually applied to the back gauge 25, Variations were likely to occur in the bending position due to differences in the applied force and direction.

Conventionally, the workpieces have been taken out one by one after the completion of the bending process. However, this method has a drawback that it requires a large amount of labor and time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional processing method, and has as its object to provide a safe and efficient bending apparatus in which a workpiece is accurately applied. I do.

[0011]

According to a first aspect of the present invention, there is provided a bending apparatus, comprising: a pair of bending dies having a horizontal bending line; And a positioning mechanism for stopping the bending mold in the vicinity where the workpiece is not pressed against the workpiece, the workpiece abutting member being vertically movable and having a flat upper surface. Features.

Further, a bending apparatus according to a second aspect of the present invention is the bending apparatus according to the first aspect, characterized in that a servo motor is provided in the bending die positioning mechanism.

Furthermore, the bending apparatus according to a third aspect of the present invention is characterized in that, in the configuration of the first or second aspect, an extruding member is provided which is movable in parallel with the bending line.

In the bending apparatus according to the first aspect, first, the interval between the pair of bending dies is determined by a positioning mechanism in the vicinity of not being pressed against the workpiece, for example, the thickness of the workpiece + 0.0. Move and stop to about 1 mm. Next, the workpiece is placed in an upright state on an abutting member for the workpiece having a flat upper surface, applied by its own weight, and held by being sandwiched between a pair of bending dies. Then, by moving the butting member up and down in the vertical direction, the bending position of the workpiece is positioned at the bending line provided in the pair of bending dies.
In this state, one of the bending dies is driven by the positioning mechanism in the direction of the other bending die, and the workpiece is pressed between the pair of bending dies to perform the bending process.

In the bending apparatus according to the second aspect, first, a distance between a pair of bending dies is controlled by a positioning mechanism having a servomotor controlled by an NC device.
The workpiece is moved and stopped to a position where no pressure is applied to the workpiece, for example, to about +0.1 mm of the thickness of the workpiece. Next, the workpiece is placed in an upright state on an abutting member for the workpiece having a flat upper surface, applied by its own weight, and held by being sandwiched between a pair of bending dies. Then, the bending position of the workpiece is moved to the bending line of the bending die by moving the butting member up and down in the vertical direction. In this state, one bending die is driven in the direction of the other bending die by a positioning mechanism equipped with a servomotor, and a workpiece is pressed between the pair of bending dies to perform bending.

In the bending apparatus according to the third aspect, after the workpiece is bent by the bending apparatus according to the first or second aspect, the extrudable member which can advance and retreat is parallel to the bending line of the bending die. It drives and pushes out the finished workpiece after a pair of bending dies. After extruding the workpiece, the extruding member is driven parallel to the bending line and returns to its original position.

[0017]

[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view showing the entire bending apparatus, FIG. 2 is a view of FIG. 1 viewed in the Y-axis direction, and FIG. 3 is a view showing a processing step.

The bending apparatus according to the present embodiment is shown in FIGS.
As shown in FIG. 1, a die 1 and a punch 2 extending in the Y-axis direction as a pair of bending dies are arranged to face each other in the X-axis direction. The die 1 is provided with a V groove 1a forming a bending line in a horizontal direction. The die 1 is disposed with the V-groove 1 a facing the punch 2, and is detachably mounted on, for example, an upper part of a step portion 3 a of a die holder 3 having an L-shaped side surface.

The punch 2 has a V-shaped tip 2a forming a bending line. The punch 2 has a V-shaped tip 2a disposed horizontally with the V-shaped tip 2a of the die 1 facing the top of the V-groove 1a. The punch 2 has a base 2b interposed in the groove 4a of the punch holder 4 and a punch fixing bolt. 5 detachably attached. A ball nut 6 is fixed to the lower side of the punch holder 4, and a rotatable ball screw 7 extending in the X-axis direction is screwed into the nut. Ball screw 7
Is coupled to a servo motor 8 as a positioning mechanism controlled by a numerical control device (NC device) (not shown). The punch 2 rotates the ball screw 7 and the ball nut together with the punch holder 4 by the rotation of the servo motor 8. 6 can be moved back and forth in the front-rear direction (in the direction approaching / separating from the die 1 in the X-axis direction). This allows
The tip 2a of the punch 2 is fitted with the V groove 1a of the die 1,
The workpiece W can be bent by pressing.

The back gauge 9 as an abutting member is
The upper surface 9a is formed flat so that the side surface of the workpiece W is placed. The back gauge 9 is located below the die 1 and the punch 2 and is disposed in sliding contact with the side surface of the die holder 3 on the V groove 1a side of the die 1;
Can be disposed between the die 1 and the punch 2. A ball nut 10 is fixed to the side surface of the back gauge 9, and a rotatable ball screw 11 extending in the Z-axis direction is screwed into the ball nut 11. The ball screw 11 is a servo motor 12 controlled by a numerical controller (not shown). Is joined to. The back gauge 9 rotates the ball screw 11 and the ball nut 1 by rotating the servo motor 12.
The workpiece W placed on the upper surface 9a of the back gauge 9 can move up and down in the vertical direction (Z-axis direction).
Is vertically moved via the back gauge 9 so that the bending position of the workpiece W can be moved between the V groove 1a of the die 1 and the tip 2a of the punch 2.

Next, the operation of the present embodiment will be described. First, the punch 2 is driven in the X-axis direction via a ball screw 7 and a ball nut 6 by a servomotor 8 controlled by an NC device (not shown) to approach (advance) the die 1. Then, the interval between the tip 2a of the punch 2 and the die 1 is set to a value near the position where the workpiece W enters between the punch 2 and the die 1 and the tip 2a of the punch 2 does not press the workpiece W, that is, The punch 2 is advanced and stopped until the tip 2a of the punch 2 has an interval of “the thickness of the workpiece W + about 0.1 mm” with respect to the die 1 (FIG. 3).
(A)).

Second, the workpiece W is placed on the upper surface 9a of the back gauge 9 by hand and is put on the upper surface 9a of the back gauge 9 by its own weight. (FIG. 3 (b)).

Third, the back gauge 9 is not shown by an NC (not shown).
The servo motor 12 controlled by the device vertically moves up and down through the ball screw 11 and the ball nut 10,
The bending position of the workpiece W is determined. That is, the position at which the workpiece W is to be bent is positioned in a line connecting the top of the V groove 1a of the die 1 and the tip 2a of the punch 2. (FIG. 3
(C)).

Fourth, the punch 2 is driven in the X-axis direction by the servo motor 8 via the ball screw 7 and the ball nut 6 to approach the die 1, and the V groove 1 a of the die 1 and the tip 2 a of the punch 2 are moved. Press the work W in between and press the V-groove 1
The workpiece W is bent by the cooperation of the tip a and the tip 2a. (FIG. 3 (d)).

Fifthly, the pressurized punch 2 is driven by a servomotor 8 via a ball screw 7 and a ball nut 6 to retreat in the X-axis direction so as to be separated from the die 1 and to be bent. The state where the punch 2 is not pressed against W is set so that the workpiece W can be moved and taken out (FIG. 3).
(E)).

From the above, according to the present embodiment,
In the bending by the bending device, by utilizing the own weight of the workpiece W, the workpiece W can be applied to the upper surface 9a of the back gauge 9 in an upright state. It can be accurately applied to the gauge 9 and can be bent. This eliminates the risk of accidentally pinching the hand during the bending operation.

Further, since the workpiece W is brought into contact with the upper surface 9a of the back gauge 9 by utilizing its own weight, the workpiece W
In the case of single bending or in the case of multiple bending, it is possible to apply uniformly to the same position, and it is possible to obtain an effect that bending can be performed without variation in the bending position.

Further, the use of the ball screw 7 and the ball screw 6 coupled to the servo motor 8 which is controlled by the NC equipment as the positioning mechanism enables the punch 2 to be positioned at an accurate position, thereby increasing the bending accuracy. . Also, reproducibility has improved. Since the workpiece W is placed on the upper surface 9a of the back gauge 9 which can be controlled to move in the vertical direction via the ball screw 11 and the ball nut 10 by the servo motor 12 controlled by the NC device, It is possible to accurately control the position of the workpiece W,
The effect that the workpiece W can be precisely bent at a predetermined position can also be obtained.

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a perspective view showing the entire bending apparatus, and FIG. 5 is a view showing a processing step.

In the bending apparatus according to the present embodiment, a protruding rod 15 as an extruding member for taking out a bent product (workpiece) is provided in the bending apparatus configured in the same manner as in the first embodiment. It is configured. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The protruding rod 15 does not hinder the movement of the punch 2 and the vertical movement of the workpiece W by the back gauge 9 in the vicinity of the surface of the die 1 mounted on the die holder 3 where the V-groove 1a is provided. Are arranged at positions where they can be brought into contact with (extruded from) the end face of the workpiece W that has been bent.
An air cylinder 16 is connected to the protruding rod 15 on the rear surface opposite to the front surface capable of contacting the workpiece W. The protruding rod 15 is driven by the air cylinder 16 to form the bending line of the die 1. The punch 2 is positioned above the punch 2 in the Y-axis direction in parallel with the V-groove 1a and the tip 2a
It can be driven forward and backward without touching it. Note that the projecting bar 15 may slide on the upper surface of the punch 2.

Next, the operation of the present embodiment will be described. First, similarly to the first embodiment, after the workpiece W is bent, the punch 2 retreats, and the workpiece W can be taken out (FIG. 5A). Second, the stick 1
5 is moved in the Y-axis direction by the air cylinder 16 in parallel with the bending line (V-groove 1a, tip 2a), and pushes the end face of the workpiece W with the front surface of the protruding rod 15 so that the workpiece W is moved to the die 1 and the punch 2. (Figure 5 (b)). Third, the push rod 15 is returned to the original position by the air cylinder 16 (FIG. 5C).

From the above, according to the present embodiment,
Since the protruding rod 15 is provided, the work W which has been manually performed so far can be automatically taken out.
For this reason, the working efficiency was extremely improved, and the bending position was constant, so that a product of stable quality was obtained.

The technical idea having the following configuration is derived from the specific embodiment. (Supplementary Note) (1) A pair of retractable bending dies provided with a bending line in the horizontal direction and a vertically movable movable abutment member located below the bending dies and having a flat upper surface. A positioning mechanism capable of moving the bending mold and stopping in the vicinity where the workpiece is not pressed against the workpiece, and a positioning mechanism capable of moving and stopping the abutting member to a predetermined position. Bending equipment.

(2) The bending apparatus according to appendix (1), wherein the bending die and the abutting member positioning mechanism include a servomotor.

According to the bending apparatus described in the appendix (1), the workpiece can be placed on the upper surface of the abutting member in a state where the workpiece is erected using the own weight of the workpiece. Bending can be performed in a state where the hand is released from the member to be processed, while accurately applying to the workpiece. This eliminates the risk of accidentally pinching the hand during the bending operation. In addition, since the workpiece is applied using the own weight of the workpiece, the workpiece can be uniformly applied to the same position even when bending one piece or when bending a large number of pieces, without causing variation in the bending position. Bending can be performed. As a result, the working efficiency is extremely improved, and the bending position is constant, so that a product of stable quality can be obtained.

According to the bending apparatus (2), since the servomotor is used for the positioning mechanism, accurate positioning can be achieved, and the bending accuracy is increased. Also, reproducibility has improved.

[0038]

As described above, according to the bending apparatus of the first aspect of the present invention, by utilizing the own weight of the workpiece, the workpiece is placed on the upper surface of the butting member in a standing state. Therefore, even when the hand is released, the bending process can be performed while accurately applying to the abutting member. This eliminates the risk of accidentally pinching the hand during the bending operation.

Also, since the workpiece is applied using its own weight, the workpiece can be uniformly applied to the same position even when bending one piece or when bending a large number of pieces. Bending work can be performed without occurrence.
As a result, the working efficiency is extremely improved, and the bending position is constant, so that a product of stable quality can be obtained.

Further, according to the bending apparatus of the second aspect of the present invention, since the servomotor is used for the positioning mechanism, accurate positioning can be achieved, and bending accuracy is increased. Also, reproducibility has improved.

According to the bending apparatus of the third aspect of the present invention, since the extruding member is provided, it is possible to automatically take out the work which has been manually performed so far. For this reason, the working efficiency has been greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of the entire first embodiment of the present invention.

FIG. 2 is a view of FIG. 1 viewed in a Y-axis direction.

FIG. 3 is a diagram showing a processing step according to the first embodiment of the present invention.

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

FIG. 5 is a view showing a processing step according to the second embodiment of the present invention.

FIG. 6 is a view showing a conventional bending device.

[Explanation of symbols]

 Reference Signs List 1 die 2 punch 6,10 ball nut 7,11 ball screw 8,12 servo motor 9 back gauge 9a upper surface 15 protruding rod 16 air cylinder

Claims (3)

[Claims] 1. A pair of reversible bending dies provided with a bending line in a horizontal direction, and a vertically movable movable abutting member located below the bending dies and having a flat upper surface. A bending mechanism comprising: a positioning mechanism for stopping the bending die in the vicinity where the workpiece is not pressed. 2. The bending apparatus according to claim 1, wherein the bending die positioning mechanism includes a servomotor. 3. The bending apparatus according to claim 1, further comprising an extruding member capable of moving back and forth in parallel with the bending line.