JP2004114067A - Punch press with bending function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punch press with bending function which can execute a bending work and a consistent restoring motion of the bending die. <P>SOLUTION: A pair of clamping dies 21, 22, which can open and close vertically to grip a sheet workpiece W, are installed to metal die supporting members 2, 3 to support metal dies for punching work. Bending dies 23, 24 moving vertically along the clamping dies 21, 22 to bend the sheet workpiece W are arranged. For the lower bending die 24, a bending die resetting means 51 is prepared to connect and restore the bending die 24 to a waiting position driven by an actuator 78. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a punch press with a bending function having a processing function of bending a plate material piece up and down.
[0002]
[Prior Art and Problems to be Solved by the Invention]
2. Description of the Related Art Conventionally, in a punch press such as a turret punch press, there is a type in which a molding die is mounted in place of a punching die and various types of molding processes such as a burring process and a louver process are enabled (for example, Patent Document 1).
However, the forming dies in the conventional punch press can only perform forming processing of a fixed shape and dimensions. Even with similar shapes, processing with different bending dimensions and bending angles can be performed. Can not. For example, when processing a bent piece protruding in an L-shape, it is impossible to perform a processing in which a bending dimension which is the length of each side of the L-shape or a bending angle of each side is different. Therefore, it is necessary to use a different mold for each of the formed shapes having different bending dimensions and bending angles, even if the shape of the bending piece is the same. Therefore, when performing bending with various bending dimensions and bending angles, the number of dies used increases, and it is necessary to change the dies to the turret or other die supporting means.
In the case of a bent piece having a simple shape that can only be bent at the base end, bending with different bending dimensions and bending angles can be performed by adjusting the feed amount or the like. However, in the case of a bent piece such as an L-shaped bent portion having two or more steps, it cannot be processed.
[0003]
As a punch press having the above-mentioned bending function, an upper die and a lower die for sandwiching and fixing the plate material at the plate material mounting level, and feeding the plate material in a predetermined plate material feeding direction at the plate material mounting level, from the plate material A plate feed mechanism for projecting the protruding plate piece from the edge of the upper or lower die toward the downstream side in the plate feed direction; and a bending base end of the plate piece provided on the upper die so as to be able to move up and down by descending operation. And a lower bending die which is provided on the lower die so as to be able to move up and down, and which bends upwardly the bending base end of the protruding plate material piece by raising operation. (Japanese Patent Application No. 2002-44151).
According to this configuration, it is possible to perform a bending process in any of the upper and lower directions, perform a two-stage bending process bent into an L shape, a U-shaped bending process, and a bending process having different bending dimensions and bending angles. It can be done with one mold.
[0004]
In the above configuration, a drive mechanism that drives the upper mold side bending mold and the lower mold side bending mold to move up and down is required. Elevation of the bending die on the upper die side can be performed by using a ram for driving a punch. Since there is no elevating mechanism such as a ram for elevating the lower die, it is necessary to provide a dedicated elevating drive mechanism. In the above proposed example, on the lower die side, the bending die driving member to which the bending die is attached is urged downward by a spring, and the lower end of the bending die driving member is supported by the inclined surface of the wedge-shaped advance / retreat member, The ascending / descending member is moved up and down by moving in and out.
The lifting using the spring and the reciprocating member having the inclined surface is used, for example, for driving the forming die described in Japanese Patent Application Laid-Open No. H11-150572 to the use position and the standby position.
[0005]
However, if the lower die side bending die lifting / lowering drive mechanism is configured with the return spring and the advance / retreat member as described above, there is not much room in the lower die side, so the bending die driving member is moved downward. Cannot be used as a spring that urges the spring. Therefore, even if the advancing / retreating member retreats, there is a possibility that the lower mold side bending mold may not sufficiently descend to the standby position due to insufficient lubrication or some obstacle factor.
In the case of the bending process, unlike the forming process described in Patent Literature 1, in order to raise the bending mold to impart a bending force, instead of simply raising and lowering the forming die between the use position and the standby position. In some cases, a pressing force due to bending resistance is applied to the ascending and descending guide surfaces, and it is considered that there is a high possibility that poor return occurs when the spring force is insufficient.
[0006]
[Patent Document 1]
Japanese Patent No. 2889951
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a punch press with a bending function capable of performing a bending process and reliably performing a bending die return operation.
[0008]
[Means for Solving the Problems]
A punch press having a bending function according to the present invention includes a punching means for punching a plate material, a pair of vertically openable and closable clamps sandwiching the plate, and a clamp die having a tip near one of the upper and lower clamps. A bending die which is provided so as to be able to move up and down between a bending position protruding from a stand-by position and a standby position where it is immersed, moves from the standby position to the bending position, and bends a plate material piece formed by punching by the punching means along a clamp die. And a bending die engagement returning means for returning the bending die moved to the bending position to the standby position by driving the actuator by engaging the bending die.
According to this configuration, the plate material as the raw material is sandwiched and fixed between the pair of clamp dies. When the bending die is protruded from the standby position to the bending position in this sandwiched state, the plate material piece protruding from the edge of the clamp die of the plate material is pushed by the bending die and bent along the clamp die. In this case, the bending dimension can be changed by slightly changing the position of the plate piece sandwiched by the clamp die, that is, by changing the position of the bending base end. By changing the amount of movement of the bending die, the bending angle can be changed. As described above, a single die can perform bending with different bending dimensions and bending angles. Note that the amount of elevation of the bending mold may be constant, and the bending angle may be always constant.
The bending mold is usually at a standby position where it is immersed from the clamp mold, and is moved to the bending position during bending. The operation of returning the bending die to the standby position is performed by driving the actuator of the bending die engagement returning means to engage the bending die. As described above, since the bending die is engaged with the bending die and is forcibly returned, the bending die is reliably returned to the standby position.
The bending mold may be provided for only one of the upper and lower clamp dies, or may be provided for both. When bending dies are provided on the upper and lower sides, bending can be performed in any of the upper and lower directions. If it is provided on only one side, it will be bent up and down.
[0009]
In the present invention, the punching means includes: a die support for supporting a punch die and a die for performing punching; and a punch driving means for raising and lowering a ram for driving the punch die. The clamp die may be supported at a position other than the position where the punch die of the die support is supported, and the clamp die may be closed by lowering the ram to sandwich the plate.
In the case of this configuration, since the clamp type is closed by the punch driving means, a dedicated driving source for closing the clamp type is not required. In addition, since the clamp mold is supported by the mold support supporting the mold for performing the punching, a dedicated mold support for the clamp mold is not required, and the configuration is simple and compact.
[0010]
In the present invention, there may be provided a monitoring means for monitoring the operation state of the actuator, and a bending mold position confirmation means for confirming the elevation position of the bending mold based on the detection information of the monitoring means.
In the case of this configuration, the elevation position of the bending die can be confirmed indirectly. For this reason, it is possible to prevent the machine operation from continuing in a state where the bending die is not properly returned to the standby position, thereby contributing to prevention of machine failure.
[0011]
Further, in the present invention, a bending die operation guiding means may be provided for guiding the bending die to move to the bending position laterally moved to the clamp die side after moving along the clamp die from the standby position.
In the case of this configuration, a bending process can be performed such that the plate piece of the plate material overvents, for example, at an acute angle. Even in the case of performing such an over-bent bending process, the bending die engagement returning means engages with the bending die to perform the returning operation, so that the bending die can be reliably returned to the standby position.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a schematic configuration of a punch press with a bending function according to this embodiment, and FIG. 2 is a side view thereof. In this punch press, upper and lower mold supports 2 and 3 made of a turret are supported by an upper frame portion 1a and a lower frame portion 1b of the frame 1 so as to be rotatable about a vertical axis concentric with each other. A plurality of punch dies 4 and die dies 5 and upper and lower assembly dies 6 and 7 for bending are arranged on the upper and lower mold supports 2 and 3 in the circumferential direction. The upper and lower assembly dies 6 and 7 for bending may be provided at only one location in the circumferential direction, or may be provided at a plurality of locations with different types of mold widths and the like. Each punch die 4 and the upper assembly die 6 for bending are driven up and down by the ram 8 of the punch driving means 9 in a state where the punch die 4 is indexed to the punch position P. The ram 8 is supported by the upper frame 1a via a guide member so as to be able to move up and down. The punch driving means 9, the ram 8, the mold supports 2 and 3, the punch mold 4 and the die mold 5 constitute a punching means 17 which is a means for punching the plate material W. The punch driving unit 9 also serves as a bending die driving unit that drives a bending die (described later) in the upper assembly die 6. The upper and lower mold supports 2 and 3 are synchronously rotated by a common motor (not shown) provided on the frame 1 via a drive transmission system such as a chain. The desired die is determined at the punch position P by the motor and the drive transmission system. As shown in FIG. 2, the punch driving means 9 includes a crank mechanism 10 for driving the ram 8 up and down, and a drive source 11 such as a motor for rotating the crank mechanism 10. This punch press with a bending function is not limited to a turret punch press, and can be applied to various types of punch presses.
[0013]
The plate feeding mechanism 12 is a unit that feeds an arbitrary portion of the plate W placed on the table 13 to the punch position P. In the plate feeding mechanism 12, a cross slide 15 that moves left and right (X direction) is installed on a carriage 14 that moves back and forth (Y direction), and a work holder 16 that grips an end of the plate W is attached to the cross slide 15. There are things.
As shown in FIG. 1, the punch press may include a tap device 69. The tap device 69 is installed on the upper frame portion 1a of the frame 1 on the side of the punch position P, for example.
[0014]
FIGS. 3 and 4 are longitudinal sectional views of bending dies 6 and 7 attached to upper and lower mold supports 2 and 3, respectively. These upper and lower assembling dies 6, 7 are dies used when bending the plate material W. The upper assembly mold 6 has an upper clamp mold 21, an upper mold side bending mold 23, and a bending mold driving member 25. The upper clamp mold 21 and the lower clamp mold 22 are members that sandwich and fix the plate material W at the plate material placement level. The upper clamp mold 21 includes an upper clamp type main body 27 having a sandwiching type portion 27a whose lower surface is a sandwiching surface of the plate material W, and a guide member 29 having a generally cylindrical shape in which the upper clamp type body 27 is fixed to a lower end. Become. The guide member 29 is installed in a tool holder 32 rotatably supported in a mold installation hole 30 of the upper mold support 2 so as to be able to move up and down and rotate integrally with the tool holder 32. The guide member 29 is engaged with a support 35 provided on the tool holder 32 and urged upward by a spring 34, so that the upper clamp die 21 does not fall off the tool holder 32. . The total force of the plurality of springs 34 is smaller than the total force of the plurality of presser springs 39 described later in the use range.
[0015]
The upper mold side bending mold 23 is a member that is provided on the upper clamp mold 21 so as to be able to move up and down, and that bends a bending base end of a plate material piece Wa (FIG. 7) protruding from the plate material W by a descending operation. It is arranged on one side of the mold body 27. The bending-type driving member 25 of the upper assembly die 6 is a member for lowering the upper-type bending die 23, and includes an action portion 25 a arranged along one side surface of the upper clamp-type main body 27 and a base body thereabove. The base portion 25b is supported in the guide member 29 of the upper clamp die 21 so as to be able to move up and down and rotate integrally with the guide member 29. The base portion 25b of the bending-type driving member 25 is attached to an upper supporting member 38 by a set bolt 36. The support member 38 is a member which is driven up and down by the ram 8 of the punch driving means 9 which also serves as a bending die driving means. The support member 38 is engaged with the ram 8 with its T-shaped head and is driven to move up and down. The support member 38 is urged upward by a pressing spring 39 against the guide member 29 of the upper clamp mold 21. The tool holder 32 is driven to rotate by a rotation mechanism 41 installed on the upper mold support 2. The rotation mechanism 41 includes a worm 45 that meshes with the worm wheel 43 of the tool holder 32, a motor (not shown) that drives the worm 45 to rotate, and the like. Thus, the upper assembly die 6 rotates integrally with the tool holder 32 by the driving of the rotation mechanism 41. Note that the support member 38 does not have to have the above-mentioned T-shaped head, and the ram 8 drives the support member 38 only in the descending direction, and the support member 38 is raised and returned by a return spring (not shown). ) May be performed. Further, the rotating mechanism 41 is not limited to the one using the worm wheel 43 and the worm 45, and may be configured to transmit the drive by a rack and a pinion (not shown).
[0016]
The bending die 23 of the upper assembly die 6 is pivotally supported by the support shaft 61 so that the upper end of the bending die 23 can swing freely toward the side where the upper clamp type main body 27 is disposed at the lower end of the upper bending die driving member 25. Have been. On one side of the upper mold side bending die 23 facing the upper clamp type main body 27, a guide projection 23a is formed to slide on one side of the upper clamp type main body 27, and on the opposite side of the upper die side bending die 23. A guide projection 23b that slides on the inner wall surface 29a of the guide member 29 of the upper clamp mold 21 is formed on the side surface. On the side surface of the upper clamp type main body 27 facing the upper die side bending die 23, an inclined surface 27b for slidingly guiding the guide projection 23a of the upper die side bending die 23 toward the upper clamp type main body 27 is formed. The inner wall surface 29a of the guide member 29 and the inclined surface 27b of the upper clamp type main body 27 constitute a bending die operation guiding means 53 for guiding the upper die bending die 23. That is, the bending die operation guiding means 53 guides the upper die side bending die 23 to move to the bending position laterally moved to the clamp die 21 side after moving from the standby position along the clamp die 21. On the side surface opposite to the side surface facing the upper-side bending die 23 of the upper clamp-type main body 27, a bent-piece release space for releasing bent pieces of the plate material W bent upward by bending from the lower-clamp die 22 side. 63 is formed by a groove-shaped recess extending in the mold width direction. FIG. 5 is a plan view of the upper clamp mold 21 as viewed from below the mounting state of the upper mold side bending mold 23.
[0017]
The lower clamp die 22 includes a lower clamp type main body 28 having a clamping type portion 28a having an upper surface serving as a clamping surface of the plate material W, and a guide member 49 having a generally cylindrical shape in which the lower clamp type main body 28 is fixed to an upper end. Become. The guide member 49 is rotatably supported in the mold installation hole 31 of the lower mold support 3.
[0018]
The lower mold side bending mold 24 is a member that is provided on the lower clamp mold 22 so as to be able to move up and down, and that bends a bending base end of a plate material piece Wa protruding from the plate material W by an ascending operation upward. It is arranged on one side. The lower mold side bending mold 24 is driven upward by the bending mold driving means 19 for the lower mold. The bending die driving means 19 drives the lower bending die 24 upward through the advance / retreat cam 52 and the bending die driving member 26 by driving the actuator 78. The bending-type driving member 26 has an action portion 26a disposed along one side surface of the lower clamp-type main body 28 and a base portion 26b below the action portion 26a. The base portion 26b can be moved up and down into the guide member 49 of the lower clamp mold 22, and can rotate integrally with the guide member 49. A cam follower 50 is provided below the base portion 26b of the bending-type driving member 26, and the bending-type driving member 26 is engaged with the advance / retreat cam 52 via the cam follower 50. The reciprocating cam 52 and the actuator 78 for reciprocating the reversing cam 52 serve as the bending die driving means 19 and the bending die engagement returning means 51 for returning the bending die 24 to the standby position.
The bending-type engagement return means 51 includes a forward / backward cam 52, an actuator 78 as a drive source for moving the forward / backward cam 52, and a transmission mechanism 55 for transmitting an output of the actuator 78 to the forward / backward cam 52. By driving the actuator 78, the cam follower 50 that engages with the cam groove 52a of the advance / retreat cam 52 is guided by the cam groove 52a, thereby returning the lower mold side bending mold 24 moved to the bending position to the standby position. The cam groove 52a of the advance / retreat cam 52 is formed as an inclined groove that is inclined downward in the advance direction of the advance / retreat cam 52. A motor such as a servomotor is used for the actuator 78. The transmission mechanism 55 includes a pinion 56 connected to the output shaft of the actuator 78, and a rack 57 that extends from the reciprocating cam 52 in the reciprocating direction and meshes with the pinion 56. The actuator 78 is provided with monitoring means 79 for monitoring the operation state. This monitoring means 79 comprises an encoder. The bending-type driving member 26 is urged downward by the pressing spring 40 with respect to the guide member 49. The pressing spring 40 is mainly for stabilizing the lowering operation of the bending-type driving member 26.
[0019]
The lower tool holder 33 is rotationally driven by a rotation mechanism 42 installed on the lower mold support 3. The rotation mechanism 42 includes a worm 46 that meshes with the worm wheel 44 of the lower tool holder 33, and a motor (not shown) that drives the worm 46 to rotate. Thus, the lower assembly mold 7 rotates integrally with the lower tool holder 33 by the driving of the rotation mechanism 42.
[0020]
The lower die 24 of the lower assembly die 7 is swingable toward the side where the lower clamp die main body 28 is disposed at the lower end of the lower bending die drive member 26 at the upper end working portion 26a of the lower bending die drive member 26. It is pivotally supported by a support shaft 62. A guide projection 24a that slides on one side of the lower clamp-type main body 28 is formed on one side of the lower mold-side bending mold 24 facing the lower clamp-type main body 28, and is formed on the opposite side of the lower mold-side bending die 24. A guide projection 24b that slides on the inner wall surface 49a of the guide member 49 of the lower clamp mold 22 is formed on the side surface. On the side surface of the lower clamp type main body 28 facing the lower die side bending die 24, an inclined surface 28b for slidingly guiding the guide projection 24a of the lower die side bending die 24 toward the lower clamp type main body 28 is formed. The inner wall surface 49a of the guide member 49 and the inclined surface 28b of the lower clamp type main body 28 constitute a bending die operation guiding means 54 for guiding the lower die side bending die 24. That is, the bending die operation guide means 54 guides the lower die side bending die 24 to move to the bending position laterally moved to the clamp die 22 side after moving from the standby position along the clamp die 22. The side surface opposite to the side surface facing the lower-side bending die 24 of the lower clamp-type main body 28 is an inclined surface that recedes toward the lower side, so that the lower clamping-type main body 28 is bent downward from the upper clamp die 21 side. A bent piece release space 64 for releasing bent pieces of the plate material W to be bent is widened. FIG. 6 is a plan view of the lower clamp mold 22 showing an attached state of the lower mold side bending mold 24.
[0021]
The upper and lower tool holders 32 and 33 are rotatable about a common rotation axis O, so that the upper clamp mold 21 and the lower clamp mold 22 are also rotatable about the same rotation axis O. The upper clamp type main body 27 and the lower clamp type main body 28 are disposed at the position of the rotation axis O. In contrast to the upper-side bending die 23 disposed on one side of the upper-clamping main body 27, the lower-side bending die 24 is opposite to one side of the lower-clamping main body 28 facing the upper-side bending die 23. Is located on the side of the side.
[0022]
FIG. 9 is a block diagram showing a control system in the punch press. The control device 70 is a means for controlling the entire punch press with a bending function, and includes a computer-based numerical control device and a programmable controller. The control device 70 controls the drive sources 74 to 78 for the next axes by executing the movement command (not shown) of each axis of the machining program 71 by the arithmetic control unit 72. Each of these axis driving sources 74 to 78 is capable of freely adjusting the amount of movement, and is composed of a servomotor. The X-axis drive source 74 and the Y-axis drive source 75 are drive sources that perform feed in the respective axial directions (X direction, Y direction) in the plate material feed mechanism 12. The C-axis drive source 76 is a drive source for rotating the upper clamp die 21 and the lower clamp die 22 around a common vertical rotation axis O, and is a drive source for the rotation mechanisms 41 and 42 (FIG. 3). is there. The drive source 77 for the ram shaft is a drive source for raising and lowering the ram 8, and is a drive source for the punch-side mold lifting / lowering means 9 for lifting and lowering the upper-side bending die 23. A drive source (actuator) 78 for the lower mold bending shaft is a drive source for moving the lower mold bending die 24 up and down, and is a drive source for moving the advance / retreat cam 52 (FIG. 3) forward and backward. Further, the control device 70 is provided with a bending mold position confirmation means 80 for confirming the vertical position of the lower mold bending mold 24 based on detection information from a monitoring means 79 for monitoring the state of the actuator 78. The control of the driving sources 74 to 78 by the control device 70 may be performed via the position controller 73 or directly.
[0023]
Next, referring to FIGS. 7 and 8, an operation of bending the plate material piece Wa projecting from the plate material W into an L-shape in two stages as shown in FIG. 10B by the punch press of this embodiment will be described. Will be explained.
In this bending process, upper and lower assembly dies 6, 7 installed on the mold supports 2, 3 are indexed to the punch position P. Prior to processing, as shown in FIG. 7 (A), the lower clamp mold 22 of the lower assembly mold 7 has the upper surface of the clamping mold portion 28a of the lower clamp mold body 28 at the plate material mounting level, and the lower mold side bending mold. Reference numeral 24 stands by at a position slightly lower than the plate material mounting level. That is, at this time, the cam follower 50 at the lower end of the lower bending-type driving member 26 is located below the inclined cam groove 52a of the advance / retreat cam 52, and the lower bending-type driving member 26 is in a lowered state. The upper clamp die 21 of the upper assembly die 6 is located at a position where the lower surface of the clamping die portion 27a of the upper clamp die main body 27 is retracted slightly above the plate material mounting level. At this time, the upper mold side bending mold 23 is retracted to a position above the lower surface of the sandwiching mold portion 27a in the upper clamp mold body 27. In this state, the bent portion of the plate W is sent to the punch position P by the plate feed mechanism 12. That is, the plate material W is sent such that the plate material piece Wa of the plate material W protrudes from the sandwiching portion 28a of the lower clamp type main body 28 to the side where the upper mold side bending mold 23 is disposed.
[0024]
Next, the lower drive of the ram 8 by the punch driving means 9 lowers the upper clamp mold 21 together with the support member 38 engaged with the ram 8, and as shown in FIG. The plate material W is sandwiched between the holding member 27a and the sandwiching portion 28a of the lower clamp mold body 28.
[0025]
When the ram 8 moves downward, the upper bending-type driving member 25 moves downward against the pressing spring 39, and as shown in FIG. The upper mold side bending mold 23 is released from the inner wall surface 29a of the upper mold side 29, and the guide projection 23a on the other side surface of the upper mold side bending mold 23 is guided by the inclined surface 27b of the upper clamp mold body 27. It descends while biased toward the body 27. Thereby, the plate material piece Wa of the plate material W protruding to the side facing the upper die-side bending die 23 is bent downward. At this time, since the bent piece relief space 64 is formed on one side surface of the lower clamp type main body 28, the bending of the plate material piece Wa to the lower side is not hindered.
[0026]
Thereafter, the upper clamp die 21 is raised together with the support member 38 engaged with the ram 8 by the ascending drive of the punch driving means 9, and as shown in FIG. Retreats slightly above the plate material W. At this time, since the upper bending die driving member 25 is urged upward by the pressing spring 39 against the upper clamp die 21, the upper die side bending die 23 is also moved by the pressing spring 39 with respect to the upper clamp body 27. To the standby position.
[0027]
Next, as shown in FIG. 8A, the plate material piece Wa side of the plate material W is further fed by a predetermined amount to the arrangement side of the upper bending die 23 by the plate material feeding mechanism 12 (FIG. 1). The dies 6, 7 are rotated by 180 °. That is, the upper and lower tool holders 32, 33 are driven to rotate by the corresponding rotation mechanisms 41, 42, respectively. As a result, as shown in FIG. 8B, the upper bending mold 23 is disposed on the right side of the upper clamp mold body 27 in the upper assembly mold 6, and the lower clamp mold body is disposed in the lower assembly mold 7. A lower mold-side bending mold 24 is arranged on the left side surface of the mold 28.
[0028]
Then, the lower drive of the ram 8 by the punch driving means 9 lowers the upper clamp mold 21 together with the support member 38 engaged with the ram 8, and as shown in FIG. The plate material W is sandwiched between the lower clamp-type main body 28 and the sandwiching mold portion 28a.
[0029]
Thereafter, the ascending drive of the bending-type driving means 19 on the lower clamp die 22 side, that is, the advance and retreat cam 52 is advanced by the actuator 78, so that the cam follower 50 at the lower end of the lower bending-type driving member 26 causes the inclined cam groove of the advance and retreat cam 52 to move. As a result, the lower bending-type driving member 26 rises against the downward bias by the pressing spring 59. For this reason, as shown in FIG. 8 (D), in the lower mold side bending mold 24, the guide protrusion 24b on one side is opened from the inner wall surface 49a of the guide member 49, and the other side surface of the lower mold side bending mold 24 is formed. When the guide projection 24a is guided by the inclined surface 28b of the lower clamp type main body 28, the lower die side bending die 24 rises while being biased toward the lower clamp type main body 28. Thereby, the plate material piece Wa of the plate material W protruding toward the side facing the lower die-side bending die 24 is bent downward. In this manner, as shown in FIG. 10B, an L-shaped bending process, that is, a bending process having two bent portions and different bending directions of the bent portions can be performed.
[0030]
When the above-mentioned bending process is completed, the upper clamp die 21 is raised together with the support member 38 engaged with the ram 8 by the upward drive of the punch driving means 9, and the upper clamp die main body 27 is retracted upward, and the bending die engagement is performed. The cam follower 50 at the lower end of the lower bending type driving member 26 is moved into the inclined cam groove 52 a of the lowering type driving member 52 by the lowering driving of the reversing means 51, that is, the retreating driving of the reciprocating cam 52 by the actuator 78 also serving as the bending type driving means 19. The lower bending die 24 is returned to the lower standby position. At this time, since the return operation is performed in a state where the cam follower 50 and the inclined cam groove 52a are engaged, even if the lower bending type driving member 26 is caught on the lower clamp die 22, the lower bending type driving member 26 is moved to the lower standby position. It is surely returned. The presser spring 40 that urges the lower bending type driving member 26 downward has a small spring constant because it is not for the return operation but for maintaining the returned lower clamp die 22 in a stable manner. Is also good.
[0031]
Further, based on the detection information of the monitoring means 79 for monitoring the operation state of the actuator 78 which is the driving source of the bending mold engagement returning means 51, the bending mold position confirmation means 80 confirms the elevation position of the lower mold side bending mold 24. Therefore, it is possible to reliably and indirectly know the elevation position of the lower-side bending mold 24, and to prevent the machine operation from continuing in the state of poor return, thereby contributing to prevention of machine failure.
[0032]
In this bending die 24, after the lower die side bending die 24 is moved from the standby position to the bending position by the inner wall surface 49a of the guide member 49, which is the bending die operation guiding means 54, and the inclined surface 28b of the lower clamp body 28, Since the tip of the bending die 24 is guided to move laterally to the lower clamp die 22 side so as to increase the bending angle of the plate W, the bending process can be performed such that the plate Wa of the plate W is over-vented. . Also in this case, the bending die 24 can be reliably returned from the bending position to the original standby position after processing because the bending die engagement returning means 51 that performs the returning operation in the engaged state is employed.
[0033]
In the punch press with a bending function, when performing the above-described bending process, by adjusting the feed amount of the plate material feed, the bending lengths L1, L2 of the respective portions of the bent plate material piece Wa (FIG. 10B )) Can be freely adjusted, and various bending processes of the bending lengths L1 and L2 can be performed by one set of dies. In addition, the bending angles θ1 and θ2 of each bending portion of the plate material piece Wa can be freely changed by adjusting the amount of elevation of the upper die-side bending die 23 and the lower die-side bending die 24 during bending. In order to be able to change the bending angle freely, it is necessary that the punch driving means 9 also serving as the upper bending die driving means and the lower bending die driving means 19 can be adjusted in the amount of elevation, for example. The mechanism uses a servo motor as a drive source. When the bending angle may be constant, the configuration may be simplified by setting the punch driving unit 9 and the bending die driving unit 19 to have a constant vertical movement.
[0034]
In addition, this punch press with a bending function is not only a bending process of simply bending to one side as shown in FIG. 10A, but also a U-shaped bending process as shown in FIG. Can be bent in the folded state. The bending process in the folded state is performed by bending the plate material piece Wa between the upper clamp mold 21 and the lower clamp mold 22 after bending it to an acute angle with the upper mold side bending mold 23 and the lower mold side bending mold 24. Is done. Thus, various processes can be performed by one set of dies.
As shown in FIGS. 10A to 10C, when the tap hole H is formed in the plate piece Wa, it is formed before the bending of the plate piece Wa. For example, after a pilot hole is formed by a punching die 4 and a die 5 provided on the die supports 2 and 3 of FIG. To form
[0035]
In this embodiment, the lower mold side bending mold driving means 19 and the bending mold engagement returning means 51 are used in common, but the actuator of the bending mold driving means 19 and the actuator of the bending mold engagement returning means 51 May be provided separately.
Further, in this embodiment, the upper mold side bending die driving means is also used as the punch driving means 9, but the bending die driving means and the punch driving means may be provided separately.
[0036]
【The invention's effect】
In addition to the punching means, the punch press with a bending function according to the present invention includes a pair of vertically movable clamp dies sandwiching the plate material, and a bend whose tip protrudes from the clamp dies near one of the upper and lower clamp dies. And a bending die which is provided so as to be able to ascend and descend between the position and the standby position to be immersed, moves from the standby position to the bending position, and bends a plate material piece formed by punching by the punching means along a clamp die. , Punching and bending. In addition, since the bending die at the bending position is provided with a bending die engagement returning unit that engages with the bending die and returns to the standby position by driving the actuator, the return operation of the bending die to the standby position can be reliably performed. Can be.
Wherein the punching means comprises: a die support for supporting a punch die and a die for punching; and a punch driving means for lifting and lowering a ram to drive the punch die. The mold is supported at a location different from the location where the punch mold of the mold support is supported, and when the clamp mold is closed by lowering the ram to sandwich the plate material, the clamp mold is closed. And a dedicated mold support for the clamp-type support are not required.
When the monitoring means for monitoring the operation state of the actuator and the bending mold position confirmation means for confirming the elevation position of the bending mold based on the detection information are provided, it is possible to know the elevation position of the bending mold, It can contribute to failure prevention.
If the bending die is moved from the standby position along the clamp die, and then provided with a bending die operation guide means for guiding the bending die to the bending position laterally moved to the clamp die side, the bending is performed such that the plate material piece overvents. Processing can be performed. Even in such a bending process, the returning operation of the bending mold to the standby position can be reliably performed.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic configuration of a punch press with a bending function according to an embodiment of the present invention.
FIG. 2 is a side view showing a schematic configuration of the punch press.
FIG. 3 is a longitudinal sectional view showing an installation state of an assembly die for bending of the punch press.
FIG. 4 is a longitudinal sectional view showing a standby state of the assembly mold.
FIG. 5 is a bottom view of the upper die in the punch press.
FIG. 6 is a plan view of a lower die in the punch press.
FIG. 7 is an explanatory view showing a first half of a bending step by the punch press.
FIG. 8 is an explanatory view showing a latter half of a bending step by the punch press.
FIG. 9 is a block diagram showing a conceptual configuration of a control system of the punch press.
FIG. 10 is a perspective view showing various bending forms of a plate piece bent by a punch press having a bending function according to the present invention.
[Explanation of symbols]
6: Upper mold
7. Lower assembly mold
9 ... Punch driving means (bending die driving means)
12 ... Sheet feeding mechanism
17 ... Punching means
19 ... Bending type driving means
21 Upper clamp type
22 ... Lower clamp type
23 ... Upper die side bending die
24 ... Lower side bending type
51 ... bending-type engagement return means
53, 54 ... bending type operation guide means
78 ... Actuator
79 ... Monitoring means
80 Bending mold position confirmation means

Claims (4)

A punching means for punching a plate material, a pair of vertically openable and closable clamps sandwiching the plate, and a bend position where a tip protrudes from the clamp die near one of the upper and lower clamp dies, and a standby position where it is immersed. A bending die that is provided so as to be able to move up and down from the standby position to the bending position, and that bends a plate material piece formed by punching by the punching means along a clamp die, and a bending die that is moved to the bending position. A punch press with a bending function, comprising: a bending die engagement returning unit that engages with the bending die and returns to the standby position by driving the actuator. The punch processing means includes: a die support for supporting a punch die and a die die for performing punch processing; and a punch driving means for moving a ram up and down to drive the punch die. 2. The bending function according to claim 1, wherein the mold is supported at a position other than a position where the punching die of the die support is supported, and the clamp die is closed by lowering the ram to sandwich the plate material. With punch press. 3. The punch with a bending function according to claim 1, further comprising a monitoring unit for monitoring an operation state of the actuator, and a bending mold position confirmation unit for confirming a vertical position of the bending mold based on detection information of the monitoring unit. press. 4. A bending die operation guide means for guiding the bending die to move from the standby position along the clamp die to a bending position laterally moved to the clamp die side. A punch press with a bending function according to 1.

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