JP2013202622A - Positioning device of plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning device of plate capable of preventing a workpiece after bending processing from falling backward.SOLUTION: At the start of bending processing with a workpiece 17, abutment members 18a and 18b are controlled to be positioned at a reference position q1 which regulates a longitudinal direction of a workpiece setting position, and after the bending processing with the workpiece 17 ends, if the workpiece 17 subjected to bending-processing inclines toward a rear side, the abutment members 18a and 18b are controlled to be positioned at an interference position q2 which interferes with this inclination action. Thus, the workpiece 17 subjected to bending-processing is prevented from falling backward.

Description

  The present invention relates to a positioning device that defines the front-rear direction position of a plate material when the plate material is bent by a bending machine, and more particularly to a technique for preventing the plate material from falling backward after the end of the bending process.

  Conventionally, a press brake (bending machine) has been used as a processing machine for bending a workpiece (plate material). As shown in FIG. 7, the press brake includes a die 102 fixed to the lower table and a punch 101 fixed to the upper table and capable of moving up and down together with the upper table.

  Further, an abutting member 104 is provided to define the position of the workpiece 103 in the front-rear direction (depth direction) (see, for example, Patent Document 1). Therefore, the operator can easily set the bending position by placing the workpiece 103 on the die 102 and further abutting the tip of the workpiece 103 against the abutting member 104. In this state, when the operator operates a foot switch (not shown), the punch 101 can be lowered and the workpiece 103 can be bent by the cooperative operation of the punch 101 and the die 102.

  Here, depending on the shape of the workpiece 103 that has been subjected to the bending process, the center of gravity may exist on the rear side (right side in the figure). In this case, the processed workpiece 103 may fall backward. possible. That is, as shown in FIG. 8A, the work 103 is placed on the die 102 in a state of abutting against the abutting member 104, and the punch 101 is lowered as shown in FIG. In the case of bending, as shown in FIG. 8 (c), the workpiece 103 after bending may fall backward.

JP 2000-263137 A

  As described above, the conventional bending apparatus uses the abutting member 104 to define the installation position of the workpiece 103 during the bending process. However, there is a case where the bent workpiece 103 may fall backward, and if the weight is large and the operator cannot support the workpiece 103, the processed workpiece 103 may fall backward. It was.

  The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to position a plate material that can prevent a workpiece after bending from falling backward. To provide an apparatus.

  In order to achieve the above object, an invention according to claim 1 of the present application is a positioning apparatus provided with a bending machine and provided with an abutting member that defines a front-rear direction position of a plate material setting position at the start of bending of a plate material. A moving means for moving the abutting member in at least two axial directions, ie, a front-rear direction and a vertical direction with respect to the bending machine, and a movement control means for controlling the movement of the abutting member by the moving means. The movement control means controls the abutting member to come to a reference position, which is a position that defines the front-rear direction of the plate material setting position, when the plate material is bent, and after the plate material is bent, When the bent plate material tilts toward the rear side, the abutting member is controlled to come to an interference position that interferes with the tilting operation. The features.

  The invention according to claim 2 is characterized in that the interference position is in front of and above the reference position.

  The invention according to claim 3 further includes a determination unit that determines whether or not the plate member is tilted rearward at the end of the bending process of the plate member, and the movement control unit includes the determination unit. The abutting member is controlled to move from the reference position to the interference position only when it is determined that the plate member tilts rearward.

  According to a fourth aspect of the present invention, a plurality of the abutting members are provided in a lateral direction of the bending machine, and the movement control means is configured to include a plurality of the abutting members at the end of the bending process. At least one is moved from the reference position to the interference position.

  According to the first aspect of the present invention, the abutting member is controlled so as to come to the reference position, the position in the depth direction of the plate material (workpiece) is defined at the time of bending, and after the bending process is finished, the abutting member The abutting member is moved so that is located at the interference position. Therefore, even when the bent plate material tilts backward, it can be prevented that the plate material falls backward due to interference with the abutting member.

  In the invention of claim 2, since the interference position is on the front side and the upper side with respect to the reference position, it can reliably interfere with the plate material tilted rearward and prevent the rearward fall.

  In the invention of claim 3, it is determined whether or not the plate member tilts backward by the judging means, and the abutting member is moved from the reference position to the interference position only when it is determined that the plate member tilts backward. Falling over can be reliably prevented, and unnecessary operation of the abutting member can be avoided.

  In the invention of claim 4, since at least one of the plurality of abutting members moves from the reference position to the interference position, it is possible to prevent the plate material from falling by the minimum abutting member.

1 is a schematic configuration diagram of a press brake equipped with a positioning device according to an embodiment of the present invention. It is a perspective view which shows roughly the moving mechanism of the abutting part mounted in the positioning device which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the control apparatus mounted in the positioning device which concerns on one Embodiment of this invention. It is explanatory drawing which shows the moving direction and moving distance of the butting part mounted in the positioning device which concerns on one Embodiment of this invention. It is a flowchart which shows operation | movement of the positioning device which concerns on one Embodiment of this invention, and a press brake. It is explanatory drawing which shows the movable range and position of an abutting part in the positioning device which concerns on one Embodiment of this invention. It is explanatory drawing which shows a mode that a workpiece | work is bent using a press brake. It is explanatory drawing which shows a mode that the workpiece | work after a process falls down to the back side, when a workpiece | work is bent using a press brake.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of a press brake (bending machine) equipped with a positioning device according to an embodiment of the present invention. As shown in FIG. 1, the press brake 11 includes a punch 13 attached to the upper table 12 and a die 14 attached to the lower table 15. Further, an abutting member 18 is provided on the depth side (rear side) of the punch 13 and the die 14 for defining the position in the depth direction (rear side) of the work 17 to be bent. Further, a control unit 16 for controlling the entire press brake 11 including the position control of the abutting member 18 is provided.

  In the press brake 11, the worker P inserts the workpiece 17 through the gap between the punch 13 and the die 14 while the upper table 12 is raised, and further abuts the tip of the workpiece 17. The workpiece 17 is bent by contacting the member 18 and lowering the upper table 12 in this state. That is, when the upper table 12 is lowered, the punch 13 is pressed toward the die 14 with the workpiece 17 interposed therebetween, so that the workpiece 17 is moved to a desired angle (for example, 90 ° by the cooperative operation of the punch 13 and the die 14). ) Can be bent. Further, the abutting member 18 can be moved in three axial directions, ie, up and down, left and right, and front and rear, so as to be able to cope with a change in the bent portion of the workpiece 17.

  FIG. 2 is a perspective view schematically showing the configuration of the moving mechanism 19 used for moving the abutting member 18 in the triaxial direction. As shown in FIG. 2, the moving mechanism 19 has an L axis that moves the two abutting members 18 (18a, 18b) in the front-rear direction of the press brake 11 shown in FIG. Sliders 21a and 21b, Z-axis sliders 22a and 22b that move in the vertical direction (this is referred to as the Z-axis), and Y-axis slider 23 that moves in the left-right direction (this is referred to as the Y-axis) are provided. .

  A servo motor M1 is connected to the L-axis sliders 21a and 21b, and the position of the abutting member 12 in the L-axis direction can be determined by controlling the servo motor M1. A servo motor M2 is connected to the Z-axis sliders 22a and 22b, and the position of the abutting member 12 in the Z-axis direction can be determined by controlling the servo motor M2. Further, a servo motor M3 is connected to the Y-axis slider 23, and the position of the abutting members 18a and 18b in the Y-axis direction can be determined by controlling the servo motor M3.

  Accordingly, the moving mechanism shown in FIG. 2 functions as a moving means for moving the abutting members 18a and 18b in at least the front-rear direction and the vertical direction with respect to the bending machine (press brake 11). I have.

  FIG. 3 is a block diagram showing a detailed configuration of the control unit 16 shown in FIG. As shown in FIG. 3, the control unit 16 selects whether or not to perform the operation of supporting the workpiece 17 by the calculation control unit 31 that controls the operation of each of the servo motors M1 to M3 and the abutting members 18a and 18b. A support operation switch 32, a foot switch 33 operated by the operator P when starting the bending process, and an upper end sensor 34 for detecting that the upper table 12 has reached the upper end are provided. Although there are other components that control the entire press brake 11, only the components related to the operation of the abutting members 18a and 18b are described here.

  The arithmetic control unit 31 acquires information on the workpiece 17 to be processed from the host system, and each servo motor M1 so that the butting members 18a and 18b are at desired positions (positions that define the workpiece 17). Control M3. That is, the arithmetic control unit has a function as a movement control means for controlling the movement of the abutting members 18a and 18b by the movement mechanism 19 (moving means). Note that the positions of the butting members 18a and 18b at this time are set as reference positions.

  Further, as will be described later, the arithmetic control unit 31 determines whether or not the workpiece 17 is tilted backward, and when it is determined that the workpiece 17 tilts backward, the arithmetic control unit 31 moves the abutting members 18a and 18b. I do. In other words, the calculation control means 31 has a function as a judgment means for judging whether or not the work 17 falls backward when the work 17 (plate material) is bent. Note that the arithmetic control unit 31 can be configured as an integrated computer including a central processing unit (CPU) and storage means such as a RAM, a ROM, and a hard disk.

  In the present embodiment, when the bending process is finished, the abutting members 18a and 18b are moved to the front side and the upper side to cause the workpiece 17 and the abutting members 18a and 18b to interfere with each other, so that the workpiece 18 is moved backward. To prevent falling.

  FIG. 4 is an explanatory view showing the positional relationship between the workpiece 17 bent by the press brake 11 and the abutting member 18. Consider a case where the workpiece 17 is bent by lowering the punch 13 with the workpiece 17 placed on the die 14 and pressurizing the workpiece 17 with the punch 13 and the die 14. Here, the distance from the center of the punch 13 and the die 14 to the tip of the workpiece 17 (that is, the tip of the abutting member 18) is L, the bending angle of the workpiece 17 is θ, the plate thickness of the workpiece 17 is t, An angle with respect to the horizontal direction of the workpiece 17 after bending is α, and an interval between two positions of the workpiece 17 in contact with the upper end surface of the die 4 is V.

In order to prevent the workpiece 17 after bending from tilting backward, it is desirable to move the position of the abutting member 18 from the reference position q1 shown in FIG. 4 to the interference position q2. When the distance in the height direction (Z-axis direction in FIG. 2) between the reference position q1 and the interference position q2 is H and the distance in the front-rear direction (L-axis direction in FIG. 2) is W, H and W are (1) and (2).

  Therefore, in the arithmetic and control unit 31 shown in FIG. 3, the coordinates of the reference position q1 (coordinates in the three axes direction) and the coordinates of the interference position q2 (coordinates in the three axis directions) are based on the information of the workpiece 17 given from the host system. (Coordinates) can be recognized, and the abutting members 18a and 18b can be appropriately set to the reference position q1 and the interference position q2 based on the coordinate data.

  Next, the operation of the positioning device according to this embodiment will be described with reference to the flowchart shown in FIG. First, in step S11, the arithmetic control unit 31 shown in FIG. 3 accepts an on / off setting of the workpiece support operation. That is, it is determined whether or not the support operation switch 32 is turned on. If it is turned on, the process proceeds to step S12. If it is turned off, the process proceeds to step S13.

  In step S12, the calculation control unit 31 calculates the target support position of the workpiece 17 (that is, the interference position q2 shown in FIG. 4). Here, since the work 17 to be bent is given information on its size, thickness, bending position, etc. from the host system, the calculation control unit 31 obtains the reference position q1 based on this information. Furthermore, the interference position q2 can be obtained by using the above-described equations (1) and (2).

  In step S <b> 13, the arithmetic control unit 31 receives an input operation of a start switch (not shown) of the press brake 11. When the start switch is turned on, the press brake 11 becomes operable. Thereafter, the process proceeds to step S14.

  In step S14, the arithmetic control unit 31 controls the driving of the servo motors M1 to M3 to operate the L-axis sliders 21a and 21b, the Z-axis sliders 22a and 22b, and the Y-axis slider 23 shown in FIG. The abutting members 18a and 18b are controlled so as to come to the reference position (q1 in FIG. 4).

  In step S15, the arithmetic control unit 31 determines whether or not the abutting members 18a and 18b have reached the target position (in this case, the reference position q1). If not, the process returns to step S14. If it has reached, the process proceeds to step S16.

  In step S <b> 16, the arithmetic control unit 31 receives an input operation by the foot switch 33. Then, when the worker P (see FIG. 1) inserts the workpiece 17 between the upper tail 12 and the lower table 15 of the press brake 11 and the tip of the workpiece 17 abuts against the abutting member 18, the workpiece 17 The position of is determined. When the foot switch 33 (see FIG. 3) is operated in this state, the upper table 12 is lowered (step S17). Thereafter, the work 17 is bent by the cooperative operation of the punch 13 and the die 14.

  In step S18, the arithmetic control unit 31 determines whether or not the punch 13 has reached the target point (in this case, the lowest point). When the bending process of the workpiece 17 is finished, the punch 13 has reached the target point. If the target point has been reached, the process proceeds to step S19.

  In step S <b> 19, the arithmetic control unit 31 recognizes that the work 17 bending completion signal has been output.

  In step S20, the arithmetic control unit 31 determines whether or not the work support operation is on. If it is on, the process proceeds to step S21. If it is off, the process proceeds to step S23.

  In step S21, when the workpiece support operation is on, the servo motors M1 to M3 are operated to control the abutting members 18a and 18b at the interference position q2. That is, the abutting member 18 shown in FIG. 4 is moved in the L-axis direction (front side) and the Z-axis direction (upper side) so that the abutting member 18 moves from the reference position q1 to the interference position q2.

  In step S22, it is determined whether or not the abutting member 18 has reached the target position (in this case, the interference position q2). If the target position has been reached, the upper table 12 is raised in step S23. By this operation, the workpiece 17 is released from the pressurization by the punch 13 and the die 14, and therefore tilts backward. At this time, since the abutting members 18a and 18b are moved to the interference position q2, even if the worker P releases his / her hand from the workpiece 17, the workpiece 17 can be prevented from falling backward.

  In step S24, the calculation control unit 31 determines whether or not the next process exists, and if the next process exists, the process returns to step S14. That is, the abutting members 18a and 18b are moved to the reference position for the next bending process, and the above-described processing is repeated. On the other hand, this process is complete | finished when the next process does not exist.

  Thus, when the workpiece 17 is bent, the abutting members 18a and 18b are moved from the reference position q1 to the interference position q2 (a front side and an upper side of the reference position q1), whereby the workpiece 17 after the bending process is pressed. It is possible to avoid falling to the rear side of the brake 11.

  In this way, in the plate material positioning apparatus according to the present embodiment, the abutting member 18 (18a, 18b) is used when the workpiece 17 (plate material) is bent using the press brake 11 (bending machine). The position of the workpiece 17 in the front-rear direction is defined, and after the bending process is completed and the workpiece 17 is released from the pressurization of the punch 13 and the die 14, the abutting member 18 (18a, 18b) is moved to the workpiece. Since it moves to the interference position q2, which is a position where it is possible to prevent the 17 from falling, it is possible to avoid the problem that the work 17 after the bending process ends falls to the rear side of the press brake 11. .

  In the above-described embodiment, an example in which the two abutting members 18a and 18b are both moved from the reference position q1 to the interference position q2 when performing the workpiece support operation has been described. However, the two abutting members 18a and 18b Only one of them may be moved to the interference position q2. In this case, since the number of the abutting members 18 to be moved can be reduced, the calculation load on the calculation control unit 31 can be reduced.

  Next, a modification of the above-described embodiment will be described. In the above-described embodiment, as described in step S11 of FIG. That is, when the worker P determines that the support operation of the workpiece 17 by the abutting members 18a and 18b is necessary, the workpiece support operation is turned on. Specifically, the work support operation is turned on when the support operation switch 32 shown in FIG. 3 is turned on.

  On the other hand, in the modified example, it is automatically recognized whether or not a workpiece support operation is necessary based on the data of the workpiece 17 and its bending position. Then, only when it is determined that it is necessary, a process of moving the abutting members 18a and 18b from the reference position q1 to the interference position q2 is executed.

  As a determination method, for example, as shown in FIG. 6, the movable distance in the L-axis direction of the butting members 18a and 18b is Lmax, and the distance from the bending position in the L-axis direction at the reference position q1 is L1. In addition, when these ratios (Lmax / L1) are lower than the preset set value A1 (that is, “Lmax / L1 ≦ A1”), it is possible to set the workpiece support operation to be executed. That is, the fact that the distance L1 in the L-axis direction is large means that the tip end portion of the work 17 has greatly entered in the depth direction, and therefore the possibility that the work 17 after bending will fall backward is increased. . In this case, the numerical value of (Lmax / L1) becomes small, and if it falls below the set value A1, the work support operation is executed, and the work 17 can be prevented from falling backward.

  On the other hand, the fact that the distance L1 in the L-axis direction is small means that the tip end portion of the work 17 does not enter the depth direction so much, so that the work 17 after bending does not fall backward. In this case, the numerical value of (Lmax / L1) becomes large and exceeds the set value A1, so “Lmax / L1 ≦ A1” is not satisfied, and the workpiece support operation is not executed. That is, unnecessary work support operations can be avoided.

  As another example of the determination method, based on the lateral width Y1 (length in the Y-axis direction) of the workpiece 17, the distance L1 shown in FIG. When the set value A2 is exceeded (that is, “Y1 * L1 * t ≧ A2”), it is possible to set so as to execute the workpiece support operation. That is, the fact that the distance L1 in the L-axis direction is large means that the tip end portion of the work 17 has greatly entered in the depth direction, and therefore the possibility that the work 17 after bending will fall backward is increased. . Further, the fact that the width Y1 is large and the plate thickness t is large means that the weight of the workpiece 17 is large, and it becomes difficult for the operator P to support this when the workpiece 17 tilts backward. Therefore, when “Y1 * L1 * t ≧ A2” is established, the workpiece 17 can be prevented from falling backward by executing the workpiece support operation.

  On the other hand, if “Y1 * L1 * t ≧ A2” does not hold, the possibility that the workpiece 17 will fall backward is low, and even if it falls, the weight is light and the operator P can easily support it. Since it can be determined, the workpiece support operation is not executed. Therefore, it is possible to avoid an unnecessary work support operation being performed.

  In this way, in the plate material positioning device according to the modification, it is automatically determined whether or not the workpiece support operation by the abutting members 18a and 18b is to be executed, so the workpiece 17 falls to the rear side of the press brake 11. This can be prevented, and unnecessary work support operation can be avoided.

  The plate material positioning device of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. be able to.

  For example, in the above-described embodiment, the example in which the two abutting members 18 are provided has been described. However, the number of the abutting members 18 may be one, or three or more. Further, in the above-described embodiment, the example in which the abutting members 18a and 18b are movable in the three axis directions of the L axis, the Y axis, and the Z axis has been described, but the present invention is not limited to this, What is necessary is just to be able to move in two axial directions of the L axis (front and rear direction) and the Z direction (up and down direction). That is, as shown in FIG. 4, the abutting member 18 only needs to be able to move from the reference position q1 to the interference position q2. Therefore, the abutting member 18 may be moved only in the biaxial direction.

  In the above-described embodiment, the example in which the interference position q2 is obtained using the above-described expressions (1) and (2) has been described. However, the interference position q2 is an exact value calculated by the expressions (1) and (2). It is not necessary that the position of the workpiece 17 be in contact with the workpiece 17 after the bending process is completed, and the position may be a position where the workpiece 17 after the bending process interferes with the workpiece 17 and can be prevented from falling when tilted backward.

  INDUSTRIAL APPLICABILITY The present invention can be used to prevent the workpiece after the processing from falling backward when the workpiece is bent by a press brake.

11 Press brake (bending machine)
12 Upper table 13 Punch 14 Die 15 Lower table 16 Control unit 17 Work 18 (18a, 18b) Abutting member 19 Moving mechanism 21a, 21b L-axis slider 22a, 22b Z-axis slider 23 Y-axis slider 31 Calculation control unit 32 Supporting operation Switch 33 Top sensor P Worker

Claims (4)

In a positioning device provided with a bending machine and provided with an abutting member that defines the front-rear direction position of the plate material setting position at the time of starting the bending process of the plate material,
Moving means for moving the abutting member in at least two axial directions of the bending machine at the front-rear direction and the up-down direction;
A movement control means for controlling the movement of the abutting member by the moving means,
The movement control means includes
At the start of bending of the plate material, control so that the abutting member comes to a reference position that is a position that defines the front-rear direction of the plate material setting position,
After the plate material is bent, when the bent plate material tilts toward the rear side, the abutting member is controlled to come to an interference position that interferes with the tilting operation. Positioning device.   The plate member positioning apparatus according to claim 1, wherein the interference position is in front of and above the reference position. A judgment means for judging whether or not the plate material tilts toward the rear side at the end of the bending process of the plate material;
The movement control means controls the abutting member to move from the reference position to the interference position only when it is determined by the determination means that the plate material tilts toward the rear side. The plate | board-material positioning device in any one of Claim 1 or Claim 2 to do.   A plurality of the abutting members are provided in a lateral direction of the bending machine, and the movement control means is configured to move at least one of the abutting members from the reference position when the bending process is finished. The plate material positioning device according to any one of claims 1 to 3, wherein the plate material positioning device is moved to an interference position.

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