JP4460240B2 - Center mold changer in iron bending machine - Google Patents

Description

  The present invention relates to a center mold exchanging apparatus in an ironing bending machine, which is used when the length of a top die in an ironing bending machine is changed according to the bending length of a workpiece.

  FIG. 12 is a diagram for explaining a state in which the bending length of the top die in the ironing bending machine is changed, and FIG. 13 is a diagram for explaining ironing bending by the ironing bending machine.

  Here, “up and down” means up and down in FIGS. 12 and 13, “front and back” means front and back toward the paper surface in FIG. 12, left and right in FIG. 13, and “left and right” means 12 refers to the left and right sides in FIG. 12, and the front and back sides in FIG. In addition, the direction of each drawing is demonstrated on the basis of the state at the time of patent publication publication.

  As shown in FIGS. 12 and 13, in general, the iron bending machine swings the bend beam 5 upward or downward while holding the plate-like workpiece W between the top die 1 and the bottom die 3. By doing so, the bending machine 7 performs the ironing bending process on the workpiece W by the bending mold 7 mounted on the upper front side of the bend beam 5 or the bending mold 9 mounted on the lower front side of the bend beam 5.

  Here, the top die 1 is a center metal mounted on the center mold mounting portion 13 of the lifting frame 11 that can be moved up and down (including swingable in the vertical direction or movable in the vertical direction) in the iron bending machine. A mold 15, a plurality of left segment molds 17 mounted on the left side of the center mold mounting part 13 in the lifting frame 11, and a plurality of right segment molds mounted on the right side of the center mold mounting part 13 in the lifting frame 11. The mold 19 is configured. Further, as is well known, the adjacent left segment molds 17 can be connected and disconnected, respectively, and depending on the bending length of the workpiece W, an appropriate number on the left side that is not used for the iron bending process. The left segment mold 17 can be separated in the left direction with respect to the remaining left segment mold 17 used for the iron bending process. Similarly, the adjacent light segment molds 19 can be connected and disconnected, and depending on the bending length of the workpiece W, an appropriate number of right-side light segment molds 19 that are not used for the ironing bending process are: The remaining light segment mold 19 used for the iron bending process can be separated in the right direction.

  Further, the bottom die 3 is attached to a front plate 21a which is a part of the main body frame 21 in the ironing bending machine, and extends in the left-right direction. The bend beam 5 is provided behind the top die 1 in the main body frame 21 and swings in the vertical direction by driving an appropriate bending actuator such as a bending cylinder or a bending motor. The tip of one bending die 7 is on the lower side and the tip of the other bending die 9 is on the upper side. The tip of one bending die 7 is on the upper side, and the tip of the other bending die 9 is on the upper side. May face downwards.

  In the ironing and bending machine, in order to change the length of the top die 1 according to the bending length of the workpiece W, the segment molds 17 and 19 that are not used for ironing and bending as described above are used. In addition to being separated, the center mold 15 can be replaced with a center mold 15 by a center mold exchanging apparatus as shown in Patent Document 1. 12A shows a state in which a center mold 15 having a large mold width is mounted on the center mold mounting portion 13, and FIG. 12B shows a state in which the center mold mounting portion 13 has a mold. A state where the center mold 15 having a small mold width is mounted is shown.

  The center mold exchanging apparatus shown in Patent Document 1 will be briefly described as follows.

  That is, a center mold rack is provided at the front center portion of the lifting frame 11, and this center mold rack is provided with a plurality of storage sections for respectively storing the center molds 15 having different mold widths. Yes. Here, the predetermined storage part can be indexed to the mold entry / exit position, and the center mold 15 can be taken in from the left side with respect to the storage part indexed to the mold entry / exit position. It can be taken out in the left direction.

  In addition, a swing arm is provided at the front lower portion of the elevating frame 11 via a horizontal shaft, and a die chuck for holding the base end portion of the center mold 15 is provided at the distal end portion of the swing arm. ing. Here, the swivel arm is capable of swiveling around the horizontal axis between a normal swivel position in which a tip portion is directed downward and an exchange swivel position in which a tip portion is directed upward by driving of a swivel motor.

  Further, the lifting frame 11 is provided with an arm moving mechanism for moving the swivel arm in the left-right direction with respect to the center mold rack.

  When the length of the top die 1 is changed as shown in FIG. 12 according to the bending length of the workpiece W, the center mold 15 is replaced by the center mold exchanging device as follows.

  That is, first, the iron bending process by the iron bending machine is temporarily interrupted. Next, under the state where the base end portion of the used center mold 15 is held by the mold chuck, the swing arm is driven by the swing motor to move the swing arm from the normal swing position around the horizontal axis. Turn to position. Further, the center rack is appropriately operated to index an empty predetermined storage portion to the mold entry / exit position. Then, by moving the swivel arm to the left by the arm moving mechanism, the used center mold 15 is taken into the empty predetermined storage portion from the left, and the holding state by the mold chuck is changed. To release. Thus, the used center mold 15 can be stored in the center mold rack.

After the used center mold 15 is stored in the empty predetermined storage section, another predetermined storage section in which the center rack 15 to be used is stored by appropriately operating the center rack is used as the mold. Index to the entry / exit position. Next, by holding the base end portion of the center mold 15 to be used by the mold chuck and moving the swivel arm to the right by the arm moving mechanism, The center mold 15 scheduled to be used is taken out. Then, under the state where the base end portion of the center mold 15 to be used is held by the mold chuck, the swing arm is driven by the swing motor to rotate the swing arm from the replacement swing position around the horizontal axis. Turn to position. As a result, the replacement of the center mold 15 is completed, and the iron bending process by the iron bending machine can be resumed.
JP-A-7-112215

By the way, when exchanging the center mold 15 by the center mold exchanging apparatus shown in Patent Document 1, as described above, the base end portion of the center mold 15 to be used is moved by the mold chuck. The held center mold 15 is stored in the center mold rack until the swivel arm is swung from the exchange swivel position to the normal swivel position around the horizontal axis under the held state. said another predetermined storage unit accommodating the center mold 15 use planned out split into a mold out put position, is necessary to further take out the center mold 15 of the use schedule from the another predetermined storage unit Therefore, the operation accompanying the exchange of the center mold 15 increases. Therefore, there is a problem that the time from the interruption of the ironing bending process by the ironing bending machine to the resumption thereof becomes longer, and the productivity of the ironing bending machine by the ironing bending process decreases.

In the invention according to claim 1, the length of the top die in the ironing bending machine is used when changing according to the bending length of the workpiece, and the lifting frame that can be raised and lowered in the ironing bending machine is used. In a center mold exchanging apparatus for exchanging a center mold that is mounted on a center mold mounting portion and constitutes a part of the top die,
An exchanging device base that is fixed to a main body frame in the ironing bending machine, is positioned above a bend beam in the ironing bending machine and extends in the left-right direction;
Provided on the lower surface of the switching device base, with each other in preparation for the appropriate intervals a plurality of housing portions for housing different center mold of the mold width, respectively in the lateral direction, the center mold the housing portions from the front direction Center mold racks each configured in a notch shape so that they can be fitted ,
A slider provided on the back side of the center mold rack on the lower surface of the exchange device base so as to be movable in the left-right direction;
A slider actuator for moving the slider in the left-right direction;
An upper exchange arm provided on the slider so as to be movable in the front-rear direction;
An actuator for an upper exchange arm that moves the upper exchange arm in the front-rear direction;
The upper exchange arm is provided movably in the front-rear direction, and has a front holding part for holding the center mold and a rear holding part for holding the center mold to be used in the front-rear direction. A normal mode in which the front holding part and the rear holding part are located behind the center mold attaching part by movement; a first exchange mode in which the front holding part is located in a lower region of the center mold attaching part; A lower exchange arm configured to switch to a second exchange mode in which the rear holding part is located in a lower region of the center mold attaching part;
An actuator for a lower exchange arm that moves the lower exchange arm in the front-rear direction;
And a mold holding tool provided on the upper exchange arm and holding the center mold to be used .

According to the invention specific matter described in claim 1, before exchanging the center mold, the slider is moved leftward or rightward by driving the slider actuator to correspond to a predetermined storage portion. Positioning is performed at a position in the left-right direction (a position in the left-right direction close to a predetermined storage portion). Next, said by driving the actuator for the lower exchange arm moving the lower exchange arm toward the front, holds the center mold of the use schedule, which is housed in the predetermined housing portion by the front holding portion. Then, by moving the lower exchange arm in the forward direction by the driving of the actuator for the lower replacement arm, taking the center mold of the use schedule from the predetermined storage unit.

Said center mold of the use schedule from the predetermined storage section after was takeout, said by driving the slider actuator moving the slider to the right or left direction, the center of the center mold of the use schedule Wait behind the mold mounting part. Next, under the state where the center mold to be used is held by the front holding unit, the lower exchange arm is moved backward by driving the lower exchange arm actuator, and the mold holding tool To hold the center mold to be used. Then, the holding state by the front holding part is released, the lower exchange arm is moved forward by driving the lower exchange arm actuator, and the center mold to be used is held by the rear holding part. To do. Thereby, the center mold to be used can be changed from the front holding part to the rear holding part .

The lower exchange arm is in the normal mode before the center mold is replaced, and the operation before the center mold is replaced is performed in the middle of the iron bending process in principle.

  When changing the length of the top die according to the bending length of the workpiece, the center die is exchanged as follows.

  That is, first, the iron bending process by the iron bending machine is temporarily interrupted. Next, the elevating frame is raised or lowered to be positioned at the replacement height position. Thereby, preparation for replacement of the center mold is completed.

After preparation of replacement of the center mold is completed, by moving the upper replacing the lower exchange arm by driving the arm actuator the upper exchange arm integrally with the forward direction, the said lower exchange arm usually The mode is switched to the first exchange mode. Then, the used center mold is held by the front holding portion. Furthermore, the lower exchange arm is switched from the first exchange mode to the second exchange mode by moving the lower exchange arm forward by driving the lower exchange arm actuator. Thus, the used center mold can be detached from the center mold mounting portion, and the center mold to be used can be mounted on the center mold mounting portion.

The center mold of the use schedule after attached to the center mold mounting portion, the raising the lifting frame, wherein use center die appointment is detached from the rear holder, the used of the center It is located at a higher position than the upper surface of the mold. Then, by moving the lower exchange arm the upper exchange arm integrally with the rearward direction by driving the actuator for the upper exchange arm, switching the lower exchange arm from said second exchanger mode to the normal mode. As a result, the replacement of the center die is completed, and the ironing bending process by the ironing bending machine can be resumed.

After the replacement of the center mold, the slider is moved leftward or rightward by driving the slider actuator, so that the position in the left-right direction corresponding to the empty storage portion (close to the empty storage portion). Position in the horizontal direction). Then, said by driving the actuator for the lower replacement arm moves the lower exchange arm rearward direction, to sends the used of the center mold to the empty compartment.

The lower exchange arm is in the normal mode after exchanging the center mold.

In addition to the above-described operation, since the exchange device base is fixed to the main body frame, the upper exchange arm and the lower exchange arm are suppressed while suppressing vibration of the upper exchange arm and the lower exchange arm. Can be moved in the front-rear direction.

Further, the lower exchange arm is moved integrally with the upper exchange arm in the front-rear direction by driving the upper exchange arm actuator, and the lower exchange arm is moved in the front-rear direction by driving the lower exchange arm actuator. Accordingly, it is possible to sufficiently secure the amount of movement of the lower exchange arm in the front-rear direction while suppressing the longitudinal extension (elongation) of the upper exchange arm and the lower exchange arm .

In the invention described in claim 2, in addition to the subject matter of claim 1, wherein the center mold mounting portion movably fitted base end portion of the center mold the longitudinal direction It has a fitting groove or a fitting projection.

According to subject matter as defined in claim 2, in addition to the action by the subject matter of claim 1, wherein the preparation of the center mold exchange is completed, the lower exchange arm the first exchange mode by switching to the second exchange mode from said the used of the center mold of the base end portion fitting groove or said fitting state of the fitting projection is released, the used of the center gold with the mold is detached from the center mold mounting portion, and a proximal end portion of the center mold of the use schedule is fitted into the fitting groove or the fitting projection, the center mold of the use schedule It can be mounted on the center mold mounting portion.

According to a third aspect of the invention, in addition to the invention specific matter of the second aspect , the center mold mounting portion is a front shutter capable of opening and closing the front side of the fitting groove or the fitting protrusion. And a rear shutter capable of opening and closing the rear side of the fitting groove or the fitting projection.

According to subject matter as defined in claim 3, in addition to the action by the subject matter of claim 2, when disengaging the used of the center mold from the center mold mounting part, the use schedule wherein when the center mold is attached to the center mold mounting portion of the front side of the fitting groove or the fitting projection by the front shutter, the rear side of the fitting groove or the fitting projection by said rear shutter Open each one.

  In addition, after the center mold to be used is mounted on the center mold mounting portion, the front groove of the fitting groove is fitted by the front shutter, and the fitting groove or the fitting is fitted by the rear shutter. Close the rear sides of the mating protrusions.

  It should be noted that “provided” in the description of the specification and claims includes not only directly but also indirectly provided via an intermediate material.

According to the invention described in any one of claims 1 to 3 , the center mold is exchanged during a period from when the ironing bending process by the ironing bending machine is interrupted to when it is restarted. from among the action associated with the use or the center mold appointment by extraction from the center mold rack is waiting on the rear holding portion, to house the spent center mold to the center mold rack Operation can be omitted. For this reason, it is possible to improve the productivity of the iron bending machine by the iron bending process by shortening the time required to resume the iron bending process by the iron bending machine as much as possible.

Further, while suppressing the vibration of the upper exchange arm and the lower exchange arm, since the upper exchange arm and the lower exchange arm can be moved in the longitudinal direction, the positioning of the upper exchange arm and the lower exchange arm This can be performed accurately, and the accuracy of exchanging the center mold is improved.

Furthermore, since it is possible to ensure a sufficient amount of movement of the lower exchange arm in the front-rear direction while suppressing the longitudinal extension of the upper exchange arm and the lower exchange arm, the front-rear direction of the center mold exchanging device Therefore, the iron bending machine can be made compact.

  The best mode of the present invention will be described below with reference to FIGS.

  FIG. 1 is a side view of a center mold exchanging apparatus in a ironing bending machine according to the best mode of the present invention. FIGS. 2 to 8 are views of the center in the ironing bending machine according to the best mode of the present invention. FIG. 9 is a view taken along line II in FIG. 1, FIG. 10 is a view taken along line II-II in FIG. 1, and FIG. FIG. 5 is a view showing a fitting relationship between a fitting groove of a center mold mounting portion and a base end portion of the center mold.

  Here, “up and down” means up and down in FIGS. 1 to 11, and “front and back” means left and right in FIGS. 1 to 8 and front and back in FIG. 9 and FIG. "Left and right" means the front and back sides in FIG. 1 to FIG. 8 and the left and right sides in FIG. 9 and FIG.

  As shown in FIGS. 1, 9, and 10, the center mold exchanging apparatus 23 in the ironing bending machine according to the best mode of the present invention sets the length of the top die 1 in accordance with the bending length of the workpiece W. This is a device for exchanging the center mold 15 and used for changing the configuration, and has the following configuration.

  An exchange device base 25 is fixedly provided on the connecting plate 21b which is a part of the main body frame 21 in the iron bending machine, and the exchange device base 25 is located above the bend beam 5 and in the left-right direction. It extends to. The exchange device base 25 includes a horizontal portion 25a and a vertical portion 25b that is integrally provided on the front side of the horizontal portion 25a and supports the lifting frame 11.

A center mold rack 27 is provided on the lower surface of the horizontal portion 25a of the exchange device base 25. The center mold rack 27 stores a plurality of storage sections 29 for storing the center molds 15 having different mold widths. Are provided at appropriate intervals in the left-right direction. Here, each accommodating part 29 is each comprised by the notch shape so that the base end part (upper end part) of the center metal mold | die 15 can be fitted from the front direction.

  A pair of guide rails 31 extending in the left-right direction are provided behind the center mold rack 27 on the lower surface of the exchange device base 25, and a slider 33 can move in the left-right direction on the pair of guide rails 31. Is provided. A slider servomotor 35 that moves the slider 33 in the left-right direction is provided at the left end of the lower surface of the exchange device base 25. In addition, a ball screw 37 is provided between the pair of guide rails 31 on the lower surface of the exchange base 25 and is linked to the slider servomotor 35 and extends in the left-right direction. Is provided with a nut member 39 screwed into the ball screw 37.

  A pair of upper arm guides 41 extending in the front-rear direction are provided on the lower surface of the slider 33, and a hollow upper replacement arm 43 is provided on the pair of upper arm guides 41 so as to be movable in the front-rear direction. Yes. In the center of the upper exchange arm 43, an upper exchange arm cylinder 45 for moving the upper exchange arm 43 in the front-rear direction is provided.

  A pair of lower arm guides 47 extending in the front-rear direction are provided on the lower surface of the upper exchange arm 43, and a lower exchange arm 49 is provided on the pair of lower arm guides 47 so as to be movable in the front-rear direction. ing. In the center of the lower exchange arm 49, a rodless lower exchange arm cylinder 51 for moving the lower exchange arm 49 in the front-rear direction is provided.

The lower exchange arm 49, when replacing the center mold 15, and the front holding portion 49F that holds the center mold 15, the rear holding portion 49R for holding the center mold 15 that will use a back and forth is there. The lower exchange arm 49 is moved in the front- rear direction so that the front holding portion 49F and the rear holding portion 49R are located behind the center mold mounting portion 13 in the normal mode (see FIGS. 1 to 4), the front holding portion 49F. Is in the first replacement mode (see FIG. 5) located in the lower region of the center mold mounting part 13, and the rear holding part 49R is in the second replacement mode (see FIG. 6) located in the lower region of the center mold mounting part 13. It is configured to be switched.

  The front holding portion 49F is provided with a front pin 53 that can be engaged with the engagement hole 15h of the center mold 15. The front pin 53 is a front pin actuator (not shown) such as a cylinder. By driving, it is possible to move in and out of the upper surface of the lower exchange arm 49. Similarly, the rear holding portion 49R is provided with a rear pin 55 that can be engaged with the engagement hole 15h of the center mold 15. The rear pin 55 is driven by a rear pin actuator (not shown) such as a cylinder. It is possible to go in and out with respect to the upper surface of the lower exchange arm 49.

  The upper exchange arm 43 is provided with a mold gripper 57 for gripping the proximal end portion of the center mold 15 to be used. The mold gripper 57 drives the gripper cylinder 59. Thus, it is possible to move in and out of the front side of the upper exchange arm 43.

  As shown in FIG. 8, in the best mode of the present invention, the center mold mounting portion 13 of the bend beam 5 has a T-shaped fitting in which the base end portion of the center mold 15 is fitted in the front-rear direction. A groove 13s is provided. The center mold mounting portion 13 includes a front shutter 61 that opens and closes the front side of the fitting groove 13s, and a rear shutter 63 that opens and closes the rear side of the fitting groove 13s, and each front shutter 61 (63 ) Can be moved up and down by opening and closing a shutter actuator (not shown) such as a cylinder.

  In FIG. 8, the center mold 15 held by the front holding portion 49F is omitted. Further, instead of the center mold mounting portion 13 having the T-shaped fitting groove 13s, the base end portion of the center mold 15 can be fitted according to the change in the shape of the base end portion of the center mold 15. You may make it have an appropriate fitting protrusion.

  Next, the operation of the best mode of the present invention will be described.

  Before exchanging the center mold 15, the slider 33 is moved leftward or rightward by driving the slider servomotor 35, so that the horizontal position corresponding to the predetermined storage portion 29 (predetermined storage portion 29 is reached). Position in the left-right direction). Next, the lower replacement arm 49 is moved forward by driving the lower replacement arm cylinder 51 to position the front holding portion 49F below the predetermined storage portion 29. Then, by driving the front pin actuator, the front pin 53 protrudes from the upper surface of the lower exchange arm 49 and engages with the engagement hole 15h of the center mold 15 to be used. Thus, the center mold 15 scheduled to be used is held (see FIGS. 1 and 9). Further, by moving the lower exchange arm 49 forward by driving the lower exchange arm cylinder 51, the center mold 15 to be used is taken out from the predetermined storage portion 29 (see FIG. 2).

  After the center mold 15 to be used is taken out from the predetermined storage portion 29, the slider 33 is moved to the right or left by driving the slider servo motor 35, and the center mold 15 to be used is centered. It is made to stand by behind the die attachment part 13. Next, under the state in which the center mold 15 to be used is held by the front holding portion 49F, the lower exchange arm 49 is moved backward by driving the lower exchange arm cylinder 51, and the mold holding tool 57 is moved. To hold the center mold 15 to be used (see FIG. 3). Further, the front pin 53 is immersed in the upper surface of the lower exchange arm 49 by driving the front pin actuator, the holding state by the front holding portion 49F is released, and the lower exchange is performed by driving the lower exchange arm cylinder 51. The arm 49 is moved in the forward direction, and the rear holding portion 49R is positioned below the center mold 15 to be used. Then, by driving the rear pin actuator, the rear pin 55 protrudes from the upper surface of the lower replacement arm 49 and engages with the engagement hole 15h of the center mold 15 to be used, so that the rear holding portion 49R can The center mold 15 to be used is held (see FIG. 4). As a result, it is possible to change the holding of the center mold 15 to be used from the front holding portion 49F to the rear holding portion 49R.

  Note that the lower exchange arm 49 is in the normal mode before exchanging the center mold 15, and the operation before exchanging the center mold 15 is performed in the middle of the iron bending process in principle.

  When the length of the top die 1 is changed according to the bending length of the workpiece W (see FIG. 12), the center die 15 is replaced as follows.

  That is, first, the ironing bending process by the ironing bending machine is temporarily interrupted. Next, the lifting frame 11 is raised and positioned at the replacement height position. Thus, preparation for replacement of the center mold 15 is completed.

  After the preparation for exchanging the center mold 15 is completed, the lower exchange arm 49 is moved forward together with the upper exchange arm 43 by driving the upper exchange arm cylinder 45 to move the lower exchange arm 49 in the normal manner. The mode is switched to the first exchange mode. Next, the front pin 53 protrudes from the upper surface of the lower exchange arm 49 by driving the front pin actuator, and is engaged with the engagement hole 15h of the used center mold 15 (see FIG. 5). . Accordingly, the used center mold 15 can be held by the front holding portion 49F.

  After the used center die 15 is held by the front holding portion 49F, the front side of the fitting groove 13s is opened by the front shutter 61, and the rear side of the fitting groove 13s is opened by the rear shutter 63. Then, the lower replacement arm 49 is switched from the first replacement mode to the second replacement mode by moving the lower replacement arm 49 forward by driving the lower replacement arm cylinder 51. As a result, the used center mold 15 can be detached from the center mold mounting portion 13 and the center mold 15 to be used can be mounted on the center mold mounting portion 13.

  After the center mold 15 to be used is mounted on the center mold mounting part 13, the front shutter 61 closes the front side of the fitting groove 13s and the rear shutter 63 closes the rear side of the fitting groove 13s. Next, the elevating frame 11 is raised, the center mold 15 to be used is detached from the rear holding portion 49R, and is positioned at a height position higher than the upper surface of the used center mold 15. Then, the lower exchange arm 49 is moved backward together with the upper exchange arm 43 by driving the upper exchange arm cylinder 45, thereby switching the lower exchange arm 49 from the second exchange mode to the normal mode (FIG. 7). As a result, the replacement of the center mold 15 is completed, and the iron bending process by the iron bending machine can be resumed.

  After the exchange of the center mold 15 is completed, the slider 33 is moved leftward or rightward by driving the slider servomotor 35, so that the left and right positions corresponding to the empty storage portion 29 (empty storage portion 29) are obtained. Position in the left-right direction). Then, the lower exchange arm 49 is moved backward by driving the lower exchange arm cylinder 51, and the used center mold 15 is sent to the empty storage portion 29 (see FIG. 8).

  In addition, after the center mold 15 is replaced, the lower replacement arm 49 is in the normal mode.

  In addition to the above-described operation, since the exchange device base 25 is fixed to the main body frame 21, the upper exchange arm 43 and the lower exchange arm 49 are suppressed while suppressing the vibration of the upper exchange arm 43 and the lower exchange arm 49. Can be moved in the front-rear direction.

  Further, the lower exchange arm 49 is moved integrally with the upper exchange arm 43 in the front-rear direction by driving the upper exchange arm cylinder 45, and the lower exchange arm 49 is moved in the front-rear direction by driving the lower exchange arm cylinder 51. Accordingly, it is possible to sufficiently secure the amount of movement of the lower exchange arm 49 in the front-rear direction while suppressing the extension (lengthening) of the upper exchange arm 43 and the lower exchange arm 49 in the front-rear direction.

  As described above, according to the best mode of the present invention, the use of the ironing bending machine by the ironing bending machine from the operation accompanying the replacement of the center mold 15 during the period from the interruption to the resumption of the ironing bending process. It is possible to omit the operation of taking the planned center mold 15 out of the center mold rack 27 and making the rear holding portion 49R stand by, or storing the used center mold 15 in the center mold rack 27. Therefore, it is possible to shorten the time from the interruption of the ironing bending process by the ironing bending machine to the restart thereof as much as possible, and to improve the productivity of the ironing bending machine by the ironing bending process.

  Further, since the upper exchange arm 43 and the lower exchange arm 49 can be moved in the front-rear direction while suppressing the vibration of the upper exchange arm 43 and the lower exchange arm 49, positioning of the upper exchange arm 43 and the lower exchange arm 49 can be performed. This can be performed accurately, and the replacement accuracy of the center mold 15 is improved.

  In addition, since the upper exchange arm 43 and the lower exchange arm 49 can be prevented from being elongated in the front-rear direction (elongation), a sufficient amount of movement of the lower exchange arm 49 in the front-rear direction can be secured. The space occupied in the front-rear direction of the device 23 can be reduced, and the iron bending machine can be made compact.

The present invention is not limited to the description of the best mode of the invention described above, and can be implemented in various modes .

It is a side view of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is an operation | movement figure of the center metal mold | die exchange apparatus in the ironing bending machine concerning the best form of this invention. It is the figure along the II line in FIG. It is the figure along the II-II line in FIG. It is a figure which shows the fitting relationship of the fitting groove | channel of a center metal mold attaching part, and the base end part of a center metal mold | die. It is a figure explaining the state which changed the length of the top die in an ironing bending machine. It is a figure explaining the ironing bending process by an ironing bending machine.

DESCRIPTION OF SYMBOLS 1 Top die 3 Bottom die 5 Bend beam 9 Bending die 11 Lifting frame 13 Center die attachment part 15 Center die 21 Main body frame 23 Center die changer 25 Exchanger base 27 Center die rack 29 Storage part 33 Slider 43 Upper exchange Arm 45 Upper exchange arm cylinder 49 Lower exchange arm 51 Lower exchange arm cylinder 57 Mold gripper 61 Front shutter 63 Rear shutter

Claims (3)

The top die is used when changing the length of the top die in the ironing bending machine according to the bending length of the workpiece, and is attached to the center die mounting portion of the elevating frame in the ironing bending machine. In the center mold exchanging apparatus for exchanging the center mold constituting a part of
An exchanging device base that is fixed to a main body frame in the ironing bending machine, is positioned above a bend beam in the ironing bending machine and extends in the left-right direction;
Provided on the lower surface of the switching device base, with each other in preparation for the appropriate intervals a plurality of housing portions for housing different center mold of the mold width, respectively in the lateral direction, the center mold the housing portions from the front direction Center mold racks each configured in a notch shape so that they can be fitted ,
A slider provided on the back side of the center mold rack on the lower surface of the exchange device base so as to be movable in the left-right direction;
A slider actuator for moving the slider in the left-right direction;
An upper exchange arm provided on the slider so as to be movable in the front-rear direction;
An actuator for an upper exchange arm that moves the upper exchange arm in the front-rear direction;
The upper exchange arm is provided movably in the front-rear direction, and has a front holding part for holding the center mold and a rear holding part for holding the center mold to be used in the front-rear direction. A normal mode in which the front holding part and the rear holding part are located behind the center mold attaching part by movement; a first exchange mode in which the front holding part is located in a lower region of the center mold attaching part; A lower exchange arm configured to switch to a second exchange mode in which the rear holding part is located in a lower region of the center mold attaching part;
An actuator for a lower exchange arm that moves the lower exchange arm in the front-rear direction;
A center mold exchanging apparatus in an ironing bending machine, comprising : a mold gripper provided on the upper exchange arm and configured to grip the center mold to be used . 2. The ironing according to claim 1 , wherein the center mold mounting portion has a fitting groove or a fitting projection in which a base end portion of the center mold is fitted so as to be movable in the front-rear direction. Center die changer for bending machines. The center mold mounting part includes a front shutter that can open and close the front side of the fitting groove or the fitting protrusion, and a rear shutter that can open and close the rear side of the fitting groove or the fitting protrusion. The center mold exchanging apparatus in the ironing and bending machine according to claim 2 , wherein:

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