JPH0462811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for changing molds in a bending machine, such as a press brake.

Conventionally, molds in bending machines have been replaced by simply transporting them into and out of a mold changing device placed on the side of the bending machine. Therefore, the mold changing device needs to be wide enough to accommodate the long mold, and occupies the same area as the bending machine. That is, in the past, the mold changing device was large and occupied a large area.

The present invention was invented in view of the above-mentioned conventional problems, and attempts to downsize a mold changing device by automatically dividing a long mold in a bending machine into multiple parts and storing them. It is something.

Now, referring to Fig. 1, what is generally indicated by the reference numeral 1 is a bending machine such as a press brake, which, like a general press brake, has C-shaped left and right side frames 3L and 3R. We are prepared. The upper parts of the left and right side frames 3L, 3R are integrally connected by an upper frame 5, and the lower parts are connected by a lower frame 7. A long lower mold 9 is detachably attached to the upper part of the lower frame 7, and above the lower frame 7,
A ram 13 supporting an upper die 11 which cooperates with the lower die 9 to bend the plate material S is provided so as to be vertically movable. The ram 13 is attached to the side frames 3L, 3
It is connected to vertically movable piston rods of hydraulic cylinders 15L and 15R supported by R, and is moved up and down by the operation of the hydraulic cylinders 15L and 15R.

In order to attach and detach the lower die 9 and the upper die 11 to the bending machine 1, the lower die 9 and the upper die 1 are
1 is provided so as to be movable in the longitudinal direction with respect to the lower frame 7 and the ram 13 and to be detachable and replaceable.
Further, on one side of the bending machine 1, a mold changing device 17 for attaching and removing the lower die 9 and the upper die 11 to and from the bending machine 1 is disposed. As will be explained in detail later, the mold changing device 17 is
It is provided with a plurality of mold storage bodies that can freely store the lower mold 9 and the upper mold 11, and is also provided with a mold loading/unloading device that pushes and pulls the lower mold 9 and the upper mold 11 in the longitudinal direction.

Although the mold changing device 17 stores the long lower mold 9 and upper mold 11 used in the bending machine 1, its width in the left and right direction is equal to the width in the left and right direction of the bending machine 1. In comparison, it is considerably smaller, for example, 1/2 or 1/3. Therefore, the mold changing device 17 is considerably smaller than the bending machine 1, and the area of a factory or the like can be effectively utilized. In other words, the mold changing device 17 is configured to divide the long lower mold 9 and upper mold 11 into a plurality of parts and store them therein.

As already understood from the above, the lower mold 9 and the upper mold 11 are divided into a plurality of divided lower molds 9D and a plurality of divided upper molds 11D, respectively, as shown in FIG. More specifically, as is clear from FIGS. 2 and 3, the plurality of divided lower molds 9D are detachably attached to the plurality of lower mold holders 19 via the plurality of mounting screws 21. The lower die holder 19 is supported on the lower frame 7 so as to be movable in the longitudinal direction.
The hook block 2 is provided with a recess 23C at the end thereof, into which a lower mold latch lever provided in a mold loading/unloading device in a mold changing device 17, which will be described later, can be freely engaged and detached.
3 is integrally attached, and a claw block 25 having a hook portion 25H is also attached. A latch member 27 is pivotally attached to the other end of the lower mold holder 19 and is capable of latching onto a claw lock 25 provided on an adjacent lower mold holder. Latch member 27
is urged counterclockwise in FIG. 2 by the action of a spring 29 interposed between the latch member 27 and the lower die holder 19. A cam portion 27C is formed on the latch member 27, and this cam portion 27C is attached to the mold changing device 1 of the lower frame 7.
It can be freely engaged with and disengaged from a release roller 31 provided near the end on the 7 side (the attached state is omitted and is simply shown as an imaginary line in FIG. 2).

The release roller 31 serves as a separating device that releases and separates the connecting portions of the divided lower molds 9D, and presses the latch member 27 to release the latch member 27 from the claw block 25. It has the function of canceling the condition.

As can be understood from the above structure, when the lower mold holder 19 supporting a plurality of divided lower molds 9D is pressed and moved in the left and right direction in FIG. Mold holder 19
It is automatically latched onto the claw lock 25.
Conversely, when the lower mold holder 19 is pulled to the right in FIG. When the cam portion 27C of the latch member 27 moves to the position and contacts the release roller 31 provided near the side end of the lower frame 7, the latch member 27 resists the spring 29 and rotates clockwise in FIG. direction, the claw lock 25 and latch member 2
7 will be released. That is, the claw lock 25 and latch member 27 of the adjacent lower mold holder 19 are automatically latched and released by moving the lower mold holder 19 in the longitudinal direction of the lower frame 7 in order to replace the lower mold 9. It can be done in

As shown in detail in FIGS. 4 and 5,
The plurality of divided upper molds 11D are each supported by each upper mold holder 35 via a plurality of ball plungers 33. The plurality of upper mold holders 35 are connected to each other and grouped through elastic members 37, such as urethane rubber, which are approximately H-shaped.
Each upper mold holder 35 is approximately T-shaped as shown in FIG. 5, and can be freely engaged with and detached from a mold support portion 39 formed in the lower part of the ram 13 in the form of a longitudinal T groove. That is, each upper die holder 35 has a ram 1
It is movably supported by a plurality of support rollers 41 that are rotatably supported within the mold support portion 39 of No. 3.

As is clear from the above configuration, each divided upper mold 11
D can be moved up and down with respect to each other, but attachment and detachment to and from the ram 13 is performed for each group connected via the elastic member 37. That is,
As is clear from FIG. 4, at one end of the group of upper mold holders 35, a mold changing device 17, which will be described later, is provided.
A hook block 43 with a recess 43C into which a latch lever for an upper die provided in the mold loading/unloading device can be freely engaged and detached is integrally attached, and a claw block 45 with a hook 45H is also attached. Further, at the other end of the group of upper die holders 35, a latch member 47 which can be freely latched to a claw lock 45 provided in another adjacent group is pivotally attached. The latch member 47 is urged counterclockwise in FIG. 4 by the action of a spring 49 interposed between the latch member 47 and the upper die holder 35. A release pin 51 is horizontally protruded from the latch member 47, and this release pin 51 is connected to the ram 1.
It can be freely engaged with and disengaged from a release roller 53 (see FIG. 5) provided near the end of No. 3 on the side of the mold changing device 17.

The above-mentioned release roller 53 is connected to each divided upper mold 11D.
This device serves as a separating device for disconnecting and separating the connecting portions of the claws, and has the function of pressing the latch member 47 to release the hook from the claw lock 45.

As understood from the above configuration, the upper mold holder 3
Each group of 5 is pushed and moved to the left in FIG. 4, so that the latch member 47 is automatically latched to the claw lock 45 of the adjacent group. Conversely, when a group of upper mold holders 35 is pulled to the right in FIG. When the groups are moved together and come into contact with the release pin 51 of the latch member 47 and the release roller 53, the latch member 47 is rotated clockwise in FIG. 4 against the spring 49 and closed. Block 45 and latch member 4
The lock with 7 is released. That is, the claw locks 45 and the latch members 47 in each adjacent group of the upper mold holder 35 are latched and released by moving each group to the ram 13 in order to replace the upper mold 11.
This is automatically carried out by moving in the longitudinal direction.

As can be understood from the above explanation, when the lower mold 9 and the upper mold 11 are stored from the bending machine 1 to the mold changing device 17, the lower mold 9 and the upper mold 11
is stored separately into multiple parts. vice versa,
When sending out the lower mold 9 and upper mold 11 from the mold changing device 17 to the bending machine 1, a plurality of separated lower molds 9 and upper molds 11 are sent out and connected to each other. It is something.

Referring to FIGS. 1, 6, and 7, the mold changing device 17 has a plurality of supporting legs 55 in appearance.
It is constituted by a box-shaped frame 57 supported by. A loading/unloading port 61 for loading and unloading the lower mold 9 and the upper mold 11 is opened in one side plate 59 where the frame 57 faces the bending device 1.
The other side plate 63 on the opposite side is provided with an opening 65 for observing the inside. Therefore, the mold changing device 17 can carry in and out the lower mold 9 and the upper mold 11 from the loading/unloading port 61, and the opening 65
It is possible to observe the internal state from inside.

Referring again to FIGS. 6 and 7, a portion of the one side plate 59 and the other side plate 63 are the adjustment side plates 59A,
63A, respectively. The above adjustment side plate 6
3A is slightly adjustable in the direction toward and away from the other side plate 63, and the lower part of the adjustable side plate 63A is connected to a bracket 67 fixed to the lower part of the other side plate 63.
is pivotally connected to via a pivot 69. L-shaped brackets 71 are mounted near the tops of the other side plate 63 and the adjustment side plate 63A, facing each other.
A pull bolt 73 and a push bolt 75 are attached to the bracket 71 for adjusting the approach and separation of the adjustment side plate 63A from the other side plate 63. In addition, brackets 77 are fixed to a suitable number of locations on the other side plate 63, and the brackets 67 are provided with tightening fixtures 79 made of bolts, nuts, etc., for fixing the brackets by passing through long holes drilled in the adjustment side plate 63A. It is installed. Therefore, after slightly adjusting the adjustment side plate 63A in the direction toward and away from the other side plate 63,
The adjustment side plate 63A can be fixed to the other side plate 63.

The connection structure between the one side plate 59 and the adjustment side plate 59A is the same as the connection structure between the other side plate 63 and the adjustment side plate 63A described above, so a detailed explanation thereof will be omitted. In addition, the one side plate 59 facing the
The other side plate 63 and each adjustment side plate 59A and 63A are integrally connected via a plurality of beam members 81, respectively. Therefore, the adjustment side plates 59A, 63A move toward and away from the one side plate 59 and the other side plate 63 simultaneously. The above adjustment side plate 5
Adjustments 9A and 63A are made to appropriately tension the endless mold support device, which will be described later.

As is clear from FIGS. 6 to 8, the box-shaped frame 57 of the mold changing device 17 includes a plurality of mold storage bodies 83 that can freely store the lower mold 9 and the upper mold 11. In addition, a mold loading/unloading device 85 for pushing and pulling the lower mold 9 and upper mold 11 stored in the mold storage body 83 to carry them in and out is installed inside.

As best shown in FIG. 8, the mold storage body 83 is made of a channel member, and both ends thereof extend until close to the inner surfaces of the one side plate 59 and the other side plate 63. The mold storage body 83
A plurality of lower mold holder support rollers 87 for supporting the lower mold holder 19 supporting the divided lower mold 9D are rotatably attached to face each other near the entrance on the inner surface of the lower mold holder support rollers. A plurality of regulating members 89 are attached to prevent the lower die holder 19 from separating from the lower mold holder 87. Furthermore, a ball plunger 91 is installed at an appropriate position near the entrance to hold the lower mold holder 19 so that it does not easily move due to vibrations or the like.

In addition, the upper mold holder 3 which damaged the split upper mold 11D
5, a plurality of upper mold holder support rollers 93 are rotatably attached to face each other near the bottom of the mold housing 83. A regulating member 95 is attached to prevent the mold holder 35 from separating. Further, on the inner surface of the mold storage body 83, a plurality of swing regulating members 97 are disposed facing each other to restrict the swinging of the upper mold holder 35, and the upper mold holder 35 may move due to vibration or the like. A plurality of holder blocks 101 each having a ball plunger 99 for holding the block so that it does not move easily are mounted at appropriate positions.

As understood from the above configuration, the mold storage body 8
3 can accommodate either the divided lower mold 9D or the divided upper mold 11D.

As shown in FIGS. 6 to 8, both ends of the mold housing 83 are integrally supported by link members 103 and 105, and a large number of link members 103 and 105 each support a hinge pin 107. They are connected in an endless manner via the pivots. Each hinge pin 107 has an inner roller 1
09 is rotatably mounted, and each inner roller 10
9 is the adjustment side plate 59 from the inner surface of the one side plate 59.
The guide rails 111 and 113 are in contact with the inner circumferential surfaces of the guide rails 111 and 113, which are connected in an endless manner from the inner surface of the other side plate 63 to the inner surface of the adjustment side plate 63A. Also, each link member 103, 10
5, outer rollers 115 are rotatably attached to correspond to the inner rollers 109 and contact the outer peripheral surfaces of the guide rails 111 and 113. Therefore, the plurality of mold storage bodies 83 whose both ends are supported by the respective link members 103 and 105 can pivot along the guide rails 111 and 113.

As is clear from FIGS. 6 and 8, the mold storage body 83 is located inside the guide rails 111, 113. Therefore, the mold storage body 83
When the divided lower mold 9D or the divided upper mold 11D is stored in the interior, the center of gravity is located at the guide rail 111,
It will be located inside 113. Therefore, when moving from the straight part of the guide rails 111, 113 to the arcuate part of the guide rails 111, 113, the inertia in the tangential direction is smaller in comparison. Therefore, the motor for turning the mold housing 83 along the guide rails 111, 113 can be small, and the necessary indexing of the mold housing 83 becomes easy.

Further, the inner roller 109 is connected to the guide rail 1
The circular arc portions of rollers 11 and 113 are equally divided and spaced apart from each other so that they contact each other, and the distance between the shafts of the inner roller 109 is set smaller than that of the outer roller 115.
That is, when the angle formed by the imaginary line OA connecting the center O of the arcuate portion of the guide rails 111, 113 and the axis A of the inner rollers 109 on both sides of the link members 103, 105 is θ, the axis of the inner roller 109 Heart A
The angle between the imaginary line AB connecting the axis B of the outer roller 115 and the imaginary line OA is approximately θ/4. Therefore, each link member 1
Even if the guide rails 111, 113 are located in straight or arcuate portions, the guide rails 111, 113 and the inner and outer rollers 107, 115 may have large gaps between them. The guide rail 111,1
Each link member 103, 105 can move smoothly along the line 13.

Each link member 103, 105 is connected to the guide rail 1
11, 113, a drive motor 117 is mounted on the frame 57 of the mold changer 17. As shown in FIG. 7, the drive motor 117 is mounted inside the side plates 59, 63, and the reduction gear 1 provided on the drive motor 117
Both ends of a rotating shaft 121 operatively connected to a drive motor 117 via a shaft 19 are rotatably supported by the one side plate 59 and the other side plate 63. Pinions 123 are located near both ends of this rotating shaft 121.
is attached to each pinion 123, and each pinion 123 is connected to a rack 125 attached to each link member 103, 105.
It meshes with. Therefore, the drive motor 117
By rotating the pinion 123 by
Each link member 103, 105 is moved along the guide rails 111, 113 via the rack 125.

In order to facilitate indexing of the mold storage body 83 supported by each link member 103, 105, the number of teeth of the pinion 123 and the number of teeth of each rack 125 are provided to be the same. Therefore, pinion 123
When the wheel rotates once, one rack is fed by 125 minutes. A dog 127 is attached to each rack 125, and a limit switch 129 for detecting the dog 127 is attached at an appropriate position on the frame 57. Therefore, dog 1
27 and the limit switch 129, the indexing of each mold housing 83 can be detected.

Referring to FIGS. 6 and 8, the mold loading/unloading device 85 is located inside the aforementioned guide rails 111, 113. The mold loading/unloading device 85 transfers the split lower mold 9D and the split upper mold 11D stored in the mold storage body 83 at a position corresponding to the loading/unloading entrance 61 of the frame 57 in the mold changing device 17 to the bending machine. 1, or the divided lower mold 9D and the divided upper mold 11D provided in the bending machine 1.
This serves to carry the mold into the mold storage body 83.

More specifically, as shown in FIGS. 8 and 9, a linear guide bar 131 having stoppers 131S at both ends is installed horizontally between the one side plate 59 and the other side plate 63. There is. A pulley 133 such as a timing pulley is rotatably provided near the end of the guide bar 131 on the one side plate 59 side, and a bracket 137 is provided on the other side plate 63 side.
The loading/unloading motor 1 is supported on the other side plate 63 via the
35 are arranged. A drive pulley 139 is attached to the output shaft of the carry-in/out motor 135, and an endless belt 141 such as a timing belt is wound around the drive pulley 139 and the pulley 133.
The guide bar 131 is located in a region surrounded by an endless band 141, and the slider 143 slidably supported by the guide bar 131 connects to the endless band 141 via an integrally provided bracket 143B.
It is connected to the appropriate position. Therefore, the slider 143 is reciprocated along the guide bar 131 by appropriately rotating the drive pulley 139 in forward and reverse directions by the carry-in/out motor 135 .

A support bracket 145 is horizontally and integrally attached to the slider 143 and can protrude freely toward the bending machine 1 side from a loading/unloading port 61 formed in one side plate 59. An actuating device 147U and a lower actuating device 147L are attached. Upper and lower actuation device 147
U and 147L are each constituted by a suitable rotary actuator, and each rotating shaft 149U and 149L is an upper and lower latch lever 1 that can be freely displaced between a substantially horizontal state and a substantially vertical state.
51U and 151L are installed. The upper latch lever 151U is connected to the ram 1 in the bending machine 1.
3, or the upper mold holder 3 stored in the mold storage body 83 indexed upward.
5, the recessed portion 43C of the hook block 43
It can be freely engaged and detached from the upper recess 43C when in the vertical position.
It is something that engages with. Said lower latch lever 1
51L is engaged with the recess 23C of the hook block 23 in the lower die holder 19 supported on the lower frame 7 of the bending machine 1 or housed in the downwardly indexed die storage body 83. It is removable and engages with the recess 23C when in the vertical position.

As understood from the above configuration, the upper and lower actuating devices 147U and 147L are actuated simultaneously or separately to latch the upper and lower latch levers 151U and 151L to the upper mold holder 35 and the lower mold holder 19 simultaneously or separately. After that, by rotating the drive pulley 139 and moving the slider 143 by the loading/unloading motor 135, the lower mold 9 and the upper mold 11 can be loaded into and unloaded from the mold changing device 17 simultaneously or individually. Become.

In addition, cam members 1 are attached to the rotation shafts 149U and 149L of the upper and lower actuating devices 147U and 147L, respectively.
53U, 153L are attached to the support bracket 145, and each cam member 153U, 153L is attached to the support bracket 145.
Upper and lower limit switches 155U, 1 corresponding to
55L is installed. Therefore, it is possible to detect whether the upper and lower latch levers 151U, 151L are in a horizontal state or a vertical state.

As described above, when the upper and lower holders 35, 19 are carried in and out of each mold storage body 85 in the mold exchange device 17 by the mold carrying-in/out device 85, the The holder 35 is placed inside the mold storage body 85 indexed to the position.
Means for detecting whether or not 19 is present is provided. That is, as shown in FIGS. 6 and 7, a mold storage body 8 indexed at a position corresponding to the carry-in/out entrance 61 is provided on one of the one side plate 59 and the other side plate 63 as appropriate.
Sensor 157U, 1 detects the upper and lower holders 35, 19 in 3 optically or by other means.
57L is installed.

As can be understood from the above explanation,
For example, in order to transport the lower mold 9 and the upper mold 11 from the bending machine 1 to each mold storage body 83 provided in the mold changing device 17 simultaneously or individually, the slider 143 in the mold loading/unloading device 85 is used. Move forward to the bending machine 1 side and lower the upper and lower latch levers 151U, 1.
51L to the upper and lower holders 35 and 19 simultaneously or individually. After that, by moving the slider 143 backward, the upper and lower holders 35, 19
are stored in each mold storage body 83 simultaneously or individually. At this time, the upper and lower holders 35, 19
When the latch members 47, 27 respectively reach the positions of the release rollers 53, 31 provided in the bending machine 1, the upper and lower holders 35, 19 are separated from their adjacent parts. Therefore, the separated parts of the upper and lower holders 35 and 19 are placed in the mold storage body 83.
By indexing another empty mold storage body 83 and repeating the above-described operation, the upper mold 11 and the lower mold 9 are separated into a plurality of parts and stored in each mold storage body 83. can do. In addition, by performing the operation opposite to the above, the upper and lower molds separated from the plurality of mold storage bodies 83 in the mold changing device 17 can be carried out one after another to the bending machine 1 simultaneously or individually. It is something.

As can be understood from the above description of the embodiments, in short, according to the present invention, a long mold in a bending machine is divided into a plurality of parts and stored in a mold storage device. This allows the mold storage device to be downsized.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate changes. For example, it is also possible to divide the mold in the bending machine into two parts, arrange mold exchange devices on both sides of the bending machine, and exchange the molds from both sides at the same time.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the positional relationship between the bending machine and the mold changing device, Fig. 2 is a detailed view partially showing the part along the - line in Fig. 1, and Fig. 3
The figure is a side view corresponding to the case seen from the /-/ direction in Figure 1, and Figure 4 is the - of Figure 1.
5 is a side view taken from the /-/ direction in FIG. 1, FIG. 6 is an enlarged cross-sectional view along the - line in FIG. 1, and FIG. 6 is a side sectional view, FIG. 8 is a detailed enlarged view of the main part of FIG. 6, and FIG. 9 is a view taken along the - line in FIG. 8. 9...Lower mold, 11...Upper mold, 17...Mold exchange device, 83...Mold storage body, 85...Mold loading/unloading device.

Claims (1)

[Claims] 1. A long mold is provided in a plurality of divided parts so as to be freely separable and connectable to each other, and separation devices 31 and 53 for separating the divided parts are provided near one end of the bending machine 1. A plurality of mold accommodating parts 83 that can freely store the divided parts are provided on the side of one end of the mold 1, and a mold carrying device 85 for carrying molds into and out of the mold accommodating part 83 is provided. A mold changing device featuring: