JPS62212022A - Automatic die exchanging device for bending machine - Google Patents

Abstract

PURPOSE:To shorten a die exchange time and to improve a productivity of bending, by holding a die holder supporting plural split dies on a supporting member provided at the side of outside by an a machine to exchange by a exchanging device. CONSTITUTION:The die holders 33F, 33R are put out from a ram 21 to outside the machine by taking in/out devices 79F, 79R to be held by the supporting member 113 and the central split piece 69 is lifted upward by an attaching and detaching device 189. Then, the split pieces 73, 75, 71 are moved right and left by a transfer device 137, to lower the split piece 77 held by an attaching and detaching device 159 to the die holders 33F, 33R, and the central split piece 69 is lowered from the attaching and detaching device 189 to the die holders 33F, 33R. At this time, in case of exchanging the central split piece 69, the central split piece 69 is exchanged for a required one between a die shorting device 191 and the attaching and detaching device 189 to hold in the device 189 to perform the exchanging.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic mold changer for a bending machine, and more specifically to an automatic mold changer installed outside the crosspiece of a bending machine. The present invention relates to an automatic mold changing device for a bending machine that allows a plurality of molds to be easily and automatically replaced.

[Prior art 1] Conventionally, in a bending machine, a plurality of split molds are supported on a ram that moves up and down, and a workpiece such as a plate material to be bent is placed on the die and positioned at a desired position. The bending process is being carried out.

For example, when the shape or length of a workpiece such as a plate changes, an operator would remove multiple molds from the ram and install new molds to replace the entire mold. .

[Problems to be Solved by the Invention] However, in the conventional split mold replacement performed by an operator as described above, the operator may have to work while riding on the machine, or there may be areas that cannot be reached by one worker. It was a very tedious task. Furthermore, the current situation is that determining the width of the split mold is difficult and relies on the intuition of the operator, making the mold replacement work extremely inefficient.

The object of the present invention was proposed in order to solve the problem in view of the above-mentioned circumstances, and the purpose of the present invention is to provide an automatic mold exchange device outside the crosspiece so that a plurality of split molds can be easily and automatically exchanged. The present invention provides an automatic mold changing device for a bending machine that improves the efficiency of mold changing.

[Means for solving the problem] In order to achieve the above object, the present invention includes a mold holder that detachably supports a plurality of split molds attached to a ram that moves up and down in a bending machine. A mold holder loading/unloading device that can take the mold holder in and out of the ram from the ram is provided, and a support member that supports the mold holder taken out from the ram by the mold holder loading/unloading device is placed on the side of the bending machine. a first attachment/detachment device for attaching and detaching a center mold to and from a substantially central portion of the mold holder supported by the support member; A center mold storage device that stores molds is provided in a position close to the first @ unloading fit. The present invention is characterized in that a mold moving device is provided, and a second attachment/detachment device is provided for attaching and detaching a plurality of divided molds to and from a mold holder.

[Function] By employing the automatic mold changing device of the bending machine of the present invention, the mold holder supporting a plurality of split molds can be moved to the side outside the crosspiece by the mold holder ejecting device. The plurality of split molds can be easily and automatically replaced from the mold holder by the automatic mold exchange device.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIGS. 1 and 2, the frame body 3 constituting the bending machine 1 includes a base 5, left and right side frames 7.9 vertically erected from both sides of the base 5, and both left and right ends. The upper beam members 11F and 11R are supported on the upper part of the side frame 7.9 and separated from each other in the front and rear.

Support plates 13A and 13B are erected near the center in the left-right direction and near the center in the front-rear direction of the base 5, and one support plate 1 extends in the left-right direction.
Both ends of 3B are connected to side frames 7.9. At the top of these support plates 13A and 13B, there is a horizontal plate 1 whose left and right ends are connected to the side frame 7.9.
On the upper surface of the horizontal plate 15, a plurality of die support plates 17F and 17R whose left and right ends are connected to the side frames 7 and 9 are erected at appropriate distances from each other in the front and rear. Dynaboat 17F, 1 before and after this
Front and rear bottom dies 19F and 19R, which are connected at both ends to the side frame 7.9, are supported on the upper part of 7R, respectively. The bottom dies 19F and 19R are for supporting the workpiece W.

Further, as understood from FIGS. 1 and 2, a ram 21 is located above the bottom dies 19F and 19R.
are arranged so that they can move up and down.

The ram 21 is larger in the front and middle than the distance between the front and rear bottom dies 19F and 19R, and extends significantly in the left-right direction. The right and left sides of the ram 21 are connected to the side frame 7.9.
It is pivotally connected to the piston rod 27 of the left and right lifting cylinders 25 mounted on the inner surface of the bracket 1 via 23. Therefore, the ram 21 is moved up and down by the operation of the lifting cylinder 25. As shown in FIG. 2, a plurality of protruding columns 29 are provided on the central lower surface of the ram 21, and the bottom die 1 of the protruding columns 29
A slope block 31 is provided on the surfaces corresponding to 9F and 19R so as to be able to be moved up and down.

Before and after the lower surface of the ram 21, bottom dies 19F and 19 are connected via mold holders 33F and 33R, as described later.
Top die 3 for pressing and fixing the workpiece W to R
5F and 35R are installed to enable IFIm. The top dies 35F, 35R are used by attaching a plurality of divided halves of appropriate dimensions to a combination of appropriate lengths according to the width of the workpiece W.

1- When the workpiece W is pressed and fixed to the bottom dies 19F and 19R by the bottom dies 35F and 35R,
A plurality of pressing cylinders 37 for pressing the ram 21
F and 37R are attached to the lower surfaces of the upper beam members 11F and 11R at appropriate intervals. A plurality of rotary actuators 39F, 19R corresponding to each suppression cylinder 37F, 37R are mounted on the upper surface of the ram 21, and the rotation axis of each rotary actuator 39F, 39R is attached to the suppression cylinder 37F, 37R. A plurality of L-shaped movable blocks 41F, 4 are movable to a position directly below the pressure cylinders 37F, 37R and to a position away from the pressure cylinders 37F, 37R.
1R is installation.

With the above configuration, only the rotary actuators 39F and 39R are operated after detecting the workpiece W. Therefore, only the movable blocks 41F and 41R at positions corresponding to the workpiece W are connected to the respective suppression cylinders 37F and 37R.
It will be positioned directly below. In this embodiment, since the workpiece W is one long piece, all the rotary actuators 39F and 39R are operated.

The bottom die 19 is formed by the top dies 35F and 35R.
In order to upwardly bend the edge portion of the workpiece W which is fixed and suppressed by the bottom dies 19F and 19R, a pend beam 4 is provided inside the bottom dies 19F and 19R as shown in FIG.
3F and 43R are provided so as to be able to move up and down. More specifically, the pend beams 43F, 43R are attached to the upper parts of bending rams 45F, 45R which are provided to be able to move up and down, and the lower parts of each bending rams 45F, 45R are connected to each other via a plurality of brackets 47F, 47R. An eccentric shaft 49F rotatably supported by the horizontal plate 15.

It is fitted and supported on the eccentric part of 49R. Therefore, by appropriately rotating the eccentric shafts 49F and 49R, each bending ram 45F
, 45R, and each pend beam 43F, 43R.
By raising the above the upper surfaces of the bottom dies 19F and 19R, the bottom die 19F is formed by the top dies 35F and 35R.

The edge portion of the workpiece W pressed by 19R is bent upward.

The bending rams 45F, 45R are biased inward and restricted by appropriate springs 51F, 51R such as coil springs mounted between the die support plates 17F, 17R.

In order to rotate the eccentric shafts 49F and 49R, arm members 53F and 53 are attached to the eccentric shafts 49F and 49R, respectively.
R is integrally attached, and each arm member 53F, 53
The tip portions of piston rods 57F and 57R of bending cylinders 55F and 55R are pivotally connected to the tip portions of R through pins.

Therefore, by expanding and contracting the piston rods 57F and 57R of each bending cylinder 55F and 55R, each eccentric shaft 49F and 49R is rotated.

By the rotation of each eccentric shaft 49F, 49R, each bending ram 45
F, each pend beam 43F via '45R.

43R rises from the upper surface of the bottom die 19F, 19R, and the bottom die 19F is moved up by the top die 35F, 35R.
, 19R are bent upward.

The mold holders 33F and 33R described above are connected to the ram 21.
The top dies 35F and 35R are detachably attached to each other in the longitudinal direction of the top dies 35F and 35R. More specifically, FIGS. 2 and 3
As shown in the figure, there are grooves 5 in the lower part of both ends of the ram 21.
9F and 59R are bored along the longitudinal direction. In addition, horizontal rails 61F, 61R are provided on the upper portions of both outer sides of the mold holders 33F, 33R.
It is attached to extend along the longitudinal direction of R.

Therefore, the mold holders 33F and 33R are movable relative to the ram 21 in the longitudinal direction of the ram 21, that is, in a direction perpendicular to the plane of the paper in FIG. 2, using the rails 61F and 61R as guides.

On the other hand, the lower part of the inner side of the mold holders 33F and 33R is L.
Projections 63F and 63R having a letter-shaped shape are integrally provided. 1-Protrusions 65F and 65R with an inverted shape are provided on the outside of the upper part of each split mold of the tube dies 35F and 35R.
are integrally provided. The protrusions 65F, 65R
are the protrusions 63F, 63 of the mold holders 33F, 33R.
It is engaged with and supported by R. Therefore, the protrusions 65F and 65R of each split mold of the top dies 35F and 35R are engaged with and supported by the protrusions 63F and 63R of the mold holders 33F and 33R, whereby the top dies 35F and 35
R is moved along the longitudinal direction with respect to the ram 21 together with the mold holders 33F and 33R. Furthermore, there are four top dies 35F, 35R that are moved in the longitudinal direction with respect to the mold holders 33F, 33R.

Note that a top die 35F is provided between the inside of the top dies 35F and 35R and the gradient block 31.

Support blocks 67F and 67R are provided to support 35R.

Among the top dies 35F and 35R, for example, top die 3
5F, as shown in FIG. 1, the top die 35F has a center dividing piece 69, side dividing pieces 71 of the same shape and size arranged on both left and right sides, and a center dividing piece 69 and side dividing pieces. Several pieces, for example, three of the same shape and size, placed between the piece 71 and one piece of force 73.75
and 77.

Therefore, the length of the top die 35F can be selected by selecting the number of divided pieces 73, 75 and 77 according to the workpiece length of the workpiece W to be bent. In addition, if the length of the top die 35F cannot be selected and adjusted by the number of divided pieces 73, 75, and 77, the length of the top die 35F can be adjusted by appropriately selecting the length of the center divided piece 69. It is now possible to do so.

In order to move the mold holders 33F and 33R in and out of the ram 21 in the right direction as shown by the arrow in FIG.
Mold holder access bags fff79F and 79R are provided on the front and rear surfaces of one end of the ram 21, respectively. More specifically, as shown in FIGS. 183 and 4, the ram 2
Guide rails 81F and 81R extending in the left and right direction are attached to the front and rear of the guide rail 8, respectively.
1F and 81R are each movably supported.

The mold holder comes in and out along the guide rails 81F and 81R! To move 79F and 79R left and right,
Pulleys 83F, 83R and 85F, 85R (rear pulley 8
3R and 85R (not shown) are rotatably supported. Each pulley 83F, 85F and 83R, 85
R has belts 87F and 87R like timing belts.
(87R is not shown) is hung around each belt 87F.
, 87R is a mold holder loading/unloading device 79F.

79R are connected to each other. One pulley 83F
, 83R includes a through shaft 8 that passes through the ram 21 in the front-rear direction.
This through shaft 89 is operatively connected to a control motor 93 such as a servo motor or a pulse motor mounted on the ram 21 via a bracket 91.

With the above configuration, by rotating the control motor 93, the front and rear mold boulder loading/unloading devices 79F, 79R are simultaneously moved in the left-right direction along the guide rails 81F, 81R.

Referring to FIGS. 4 and 5, in the mold holder loading/unloading device 79F (79R), the guide rail 8
A moving block 95, which is movable in the left-right direction along 1F, is connected to the belt 87F via a suitable connector 97. A nose portion 99 is formed on the right side of the moving block 95, and the nose portion 99 includes the moving block 95.
A guide rail 101 is formed parallel to the direction of movement.

The guide rail 101 has a mini cylinder 103 at its tip.
A slide member 105 supporting the is movably supported. This slide member 105 is connected to a piston rod 109 of a cylinder 107 supported by the moving block 95. Therefore, by appropriately operating the cylinder 107, the slide member 105 is reciprocated with respect to the moving block 95.

As shown in FIG. 5, the mini cylinder 103 is
The mold holder 33F includes a piston rod 111 that can be freely engaged and detached from an engagement hole 33H formed on the front side surface.

In the above configuration, the piston rod 111 in the mini cylinder 103 is inserted into the engagement hole 331-1 of the mold holder 33F.
By moving the moving block 95 in the engaged state, the mold holder 33F is integrally moved, and the mold holder 33F can be moved rightward in FIG. When the mold holder 33F moves to the right side of the ram 21 in FIG. 1, by actuating the cylinder 107, the piston rod 109 moves to the right to further move the mold holder 33F to the right and bend it. It is supported by a support member 113 provided on the side of the processing machine 1, the details of which will be described later. After the split molds supported by the support member 113, which will be described later, are replaced, the cylinder 107 and the mini-cylinder 103 are reversely operated to return to their original state. Mold holder loading/unloading device 79F, 7
The structure of 9R may be other than the one described above, as long as it allows the mold holders 33F and 33R to be taken in and out from the ram 21 to the outside of the crosspiece.

For example, the mold holder 33F is supported by the support member 113 provided on the right side of the bending machine 1, as shown by the first blade, by the mold holder loading/unloading device 79F. More specifically,
As is clear from FIGS. 1 and 6, the support member 11
3 is supported by vertically erected side frames 115 and 117, and a horizontal plate 119 is attached to the upper surface of the side frames 115 and 117.

A support block 121 is attached to the lower front side of the support member 113, and this support block 121 has a groove 123 that has almost the same shape as the groove 59F bored in the ram 21 and is located at the same height. In FIG. 1, the holes are drilled in the left-right direction.

Therefore, the wedge-shaped rail 61F of the mold holder 33F engages with the groove 123 of the support member 113 from the groove of the ram 21, and is supported as shown on the right side of FIG.

The top die 35F moves integrally with the mold holder 33F, and the protrusion 65F of the top die 35F moves into the mold holder 33.
It is supported in a state where it is engaged with the protruding portion 63F of F.

When the top die 35F moves integrally with the mold boulder 33F, the top die 35F moves without moving from the mold holder 331:! - Stoppers 125 are attached to the protrusions 63F of the mold holder 33F at both ends of the side dividing pieces 71, 71 arranged on both sides of the tube die 35F. More specifically, as shown in FIG. 7, a C-shaped channel-shaped holding member 127 is fitted from the upper part of the protrusion 63F of the mold holder 33F, and is inserted into a hole bored at one end of the holding member 127. The brake shoe 129 is inserted, pressed with a bolt 133 via a spring 131, and the bolt 133 is fastened with a nut 135. therefore,
The stopper 125 prevents the top die 35F from moving relative to the mold boulder 33F with a slight force.

On the horizontal plate 119, there are several, for example, three, divided pieces 73 arranged symmetrically around the center divided piece 69.
, 75.77 and the side dividing piece 71 are the mold holder 35F,
A mold moving device 137 for moving along 33R is provided. More specifically, pulleys 139 and 141 are attached to the left and right sides of the horizontal plate 119, and a belt 143 is wound around the pulleys 139 and 141. Approximately in the center of the belt 143, which is wound between each pulley 139, 141, one of the dividing pieces 73, 75, 77 and the side dividing piece A1 is attached to a pushing member 145.
, 147 are attached to the bottle 149.1 by air cylinders provided on each of the pushing members 145.147.
51 is provided so that it can appear and disappear. Behind the pulley 139 is an air cylinder 1 which is the driver 111m of the mold moving device 137.
53, and a piston rod 155 is attached to the tip of the air cylinder 153. Piston rod 1
The tip of the belt 55 is attached to one end of the belt 143.

With the above configuration, after lifting the center division piece 69, the details of which will be described later, upward, for example, the bins 149, 1
51 is pushed upward and protrudes between the divided pieces 77. Next, when the air cylinder 153 is actuated to retract the piston rod 155, the belt 143 moves as shown by the arrow in FIG. 8, thereby moving the bin 149 to the right and the bin 151 to the left. . The bottle 149 pushes the right division piece 77 and the bottle 151 pushes the left division piece 77 to move to a predetermined position. The predetermined position means, for example, as shown in FIG. 1, that each side dividing piece 71 is in a state where it abuts up to the stoppers 125 provided at both ends of the mold holder 35F, so that the side dividing piece 71 is always divided. Pieces 73, 75, 77 are moved into fixed positions.

Next, to move each segment inward, bin 149.
151 is a hole 157 bored in the bottom of the side dividing piece 71.
The piston rod 155 is inserted into each of the piston rods using an air cylinder, and then the piston rod 155 is pushed out by operating the air cylinder 153 to move the piston rod 155 inward.

The stroke length of the piston rod 155 may be appropriately selected in advance in combination with the maximum length of the center divided piece 69 and the maximum length using several sets of divided pieces. The mold moving devices of the top die 35R are the same as that of the top die 35F, so the explanation will be omitted.

Note that the mold moving device 137 described above is only an example, and other devices may be used.

At the upper part of the support plate 113, there is a divided piece 73°756.
A second attachment/detachment device 159 for attaching and detaching the and 77 is provided. More specifically, as shown in FIGS. 1 and 6, the upper 70,000 portion of the support member 113 has a C-shaped chi 1! channels 159, 161 are attached, and dividing pieces 73, 75, 7 are attached to the front side of the channels 159, 161.
A guide member 163 that guides 7 is attached. At the top of the channel 161, there is an air cylinder 1 for lifting and lowering that moves the divided pieces 73, 75, 77 up and down via a bracket 165.
67.169 and 171 are provided. Piston rods 173, 175 and 177 are attached to the lower part of each lifting air cylinder 167, 1698 and 171, respectively. Piston rod 173.1 in J3 in Fig. 1
75J3 and 177 are shown holding divided pieces 73, 75 and 77, respectively. The lifting air cylinders 167, 1696 and 171 are arranged in parallel above the position where the divided pieces 73, 75 and 77 are moved outward by the mold moving device 137 described above.

Therefore, by operating the lifting air cylinders 167, 1696 and 171 to move the piston rods 173, 175 and 177 up and down, the divided piece 73
．． 75 and 77 are guided by the guide member 163 to be engaged with and disengaged from the mold holder 33F and supported. In addition,
Depending on the workpiece length, if the workpiece length is short, only the divided piece 73 is used, and if the workpiece length becomes longer, the divided pieces 75 and 77 are used from the outside in order. On the other hand, using split pieces 73, 75 and 77,
For a platform where the workpiece length is to be shortened, it is sufficient to set the lifting platform to 75.73 in order from the inner divided piece 77 to match the workpiece length.

At the same time, the lifting air cylinders 167, 169 and 171 move the divided pieces 73, 75 and 77 up and down, respectively.
has a built-in locking device for locking and unlocking the divided pieces 73, 75 and 77. More specifically, the eighth
As shown in the figure, for example, a lifting air cylinder 1
67, a cylindrical hollow member 181 is integrally extended upward at the upper central part of the piston 179 that operates the piston rod 173.
Air is supplied into 81. A small piston 183 that moves up and down within the piston 173 is disposed in the upper part of the piston rod 173, and a small piston rod 185 is attached to the small piston 183. Moreover, a spring 187 is provided. Piston rod 173
The distal end portion is, for example, half-split in the radial direction.

Therefore, by supplying air from arrow A, the piston 173 descends. By supplying air in the direction of arrow B, the small piston 183 is pushed out against the spring 187, and the half-shaped portion at the tip is loosened, resulting in an unlocked state. On the other hand, when the piston rod 173 is inserted into the hole 73H formed in the upper part of the divided piece 73 in the unlocked state and the air is removed, the small piston rod 185 is returned by the biasing force of the spring 187 and the divided piece 73 is pushed back. It will be locked.

The structure of the elevating air cylinders 169 and 171 is almost the same as that of the elevating air cylinder 167, so a description thereof will be omitted.

The above-mentioned second attachment/detachment device 159 may have a different configuration, and in short, any structure may be adopted as long as it moves the divided pieces 73, 75 and 77 up and down, and locks and unlocks them.

A first attachment/detachment device 189 for attaching and detaching six center division pieces to the rear upper side supporting the center division piece 69 inside the second attachment/detachment device 159; and a center division in the lower part of the first attachment/detachment device 189. A center mold storage device 191 is provided that stores a plurality of center divided pieces for six pieces to be replaced. More specifically, as understood from FIG. 6 and Group 10, a support shaft 195 is vertically erected approximately at the center of the bed 193. A support 197 of the first attachment/detachment device 189 is attached to the upper part of the support shaft 195. A center division piece 6 is provided at a slightly upper part of this support body 197.
9 is provided with a telescopic air cylinder 199 for moving it in the left-right direction in FIG. This telescopic air cylinder 1
A piston rod 201 is attached to one end of the piston rod 99, and a center split piece 6 is attached to the piston rod 201.
A support block 205 that supports an air cylinder 203 for raising and lowering 9 is attached. A piston rod 207 is provided at the lower end of the lifting air cylinder 203. This piston rod 207 locks and unlocks the center divided piece 69. The locking/unlocking device for the center divided piece 69 by the screws 1 to 207 of the lifting air cylinder 203 has already been described in detail with reference to FIG. 9 in this embodiment.
Lock the divided piece 73 by the piston rod 173 of 7.
Since it uses a lock/unlock device with almost the same structure as the unlocking device, a detailed explanation will be omitted. Therefore, the center divided piece 69 locked to the piston rod 207 is moved up and down by the lifting air cylinder 203,
Further, it is moved in the left and right direction in FIG. 6 by the telescopic air cylinder 199. The center divided piece 69 supported by the mold boulder 33F is moved up and down, and the other center divided piece 6 is stored in a center mold storage device @191 which will be described later.
It will be replaced with 9.

A support shaft 195 supporting the support body 197 has a disk-shaped table 2 for storing a plurality of center division pieces 69.
09 is supported through a plurality of bearings 211, for example, two bearings. A pulley 213 is attached to the flange portion of the table 209. On the other hand, a control motor 217 such as a motor is attached to one end of the bed 193 via a bracket 215. This control motor 21
Another pulley 219 is provided on the output shaft of No. 7, and a belt 221 such as a timing belt is connected to the pulley 213 and the pulley 219.

With the above configuration, when the control 11T--9217 is driven, the table 209 is rotated via the pulley 219, belt 221, and pulley 213.

On the circumference of the table 209, box-shaped storage portions 223 for storing a plurality of pieces, for example, six center divided pieces of eight pieces, are placed and fixed at equal intervals. This storage section 223 stores center division pieces 69 of different lengths, and when it is not possible to respond to changes in the workpiece length by simply increasing or decreasing the division pieces 73, 75, and 77, this center division piece 69 can be used. Mold storage device 1
91 is stored in the storage section 223, and the hinge division pieces 69 can be selected and replaced.

When replacing the center divided piece 69 from the storage section 223 of the center mold storage device 191, the replacement position is the first attachment/detachment device 1.
Storage section 223 where 89 piston rods 207 are raised and lowered
, and the center division piece 69 to be replaced is stored in this replacement position. J5223 is the control motor 217
This is determined by the control of J:. First attachment/detachment device 189 and center mold storage device 1 shown in FIG.
At the rear of 91, a first attachment/detachment device used for the top die 35R and a center die storage device are provided with the same shape, but their explanation will be omitted.

Note that the configurations of the first attachment/detachment device 189 and the center mold storage device 191 are merely examples, and other configurations may be adopted.

To explain the operation of exchanging the split molds in this embodiment, the mold holders 33F and 33R are taken out from the ram 21 to the outside of the support member 1 by the mold holder ejection devices 79F and 79R.
13 to support. With the split mold supported by the support member 113, the center split piece 69 is attached to the first attachment/detachment device 189.
lift it upwards. Next, the mold moving device 137 simultaneously moves the divided pieces 73, 75 other than the center divided piece 69 and the side divided pieces 71 outward in the left-right direction and stops them at predetermined positions. For example, the divided pieces 77 held by the second attachment/detachment device 15 are lowered into the mold holders 33F and 33R. When the divided pieces 77 have been lowered to the mold holders 33F and 33R, the center divided piece 69 is removed from the first attachment/detachment@189 to the mold holders 33F.

Descend to 33R. If six center divided pieces are to be replaced, the first attachment/detachment device 18 such as the center mold storage device 191
The exchange is carried out by exchanging the six center division pieces with the necessary ones between the two center division pieces 9 and holding them in the first detachable attachment @189. After moving the t-nide divided pieces 71 inward using the mold moving device 137 at the same time, the mold boulders 33F and 33R are supported by the ram 21 using the mold holder loading/unloading @79F and 79R to move a series of molds. The type exchange ends.

[Effect] As can be understood from the description of the embodiments described below, according to the present invention, by providing the mold changing device beside the bending machine, the mold can be replaced automatically. It's simple and easy to do. Therefore, the time required for replacing the molds is shortened, the work efficiency for replacing the molds is improved, and since the operator is not directly involved in replacing the molds, he or she can perform other tasks.

As a result, the productivity of the bending process is improved.

Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments by making appropriate changes. For example, it is also possible to provide each split mold with a hole and engage the bin 115 in the hole to move each split mold to the outside.

In addition, a hole is provided before or after the center mold or each divided mold, and the piston rods 139F to 143F, 1
Engage 39R to 143R, 173F, and 173R to form the center mold and each split mold in the front and back direction! It is also possible to make it tl152.

Furthermore, it is also possible to use M-detachment means for mechanically attaching and detaching the center mold and each divided mold as first and second @detachment devices for attaching and detaching the center mold and each divided mold.

The center mold storage device does not store the front and rear center molds independently, but instead stores the front and rear center molds at the same time by hanging a belt, chain, etc. in an endless manner and providing each storage section on the belt or chain. It is also possible to implement it not only as a model but also as a vertical center mold storage device.

[Brief explanation of drawings]

FIG. 1 is a front view of a bending machine equipped with a die changing device. FIG. 2 is a sectional view taken along the line ll-Tl in FIG. 1. FIG. 3 is an enlarged view of the section shown in FIG. FIG. 4 is an enlarged view of the section viewed from arrow IV in FIG. 1. FIG. 5 is a partial sectional view taken along line v--v in FIG. 4. FIG. 6 is a view taken along the vt-vt line in FIG. 1. FIG. 7 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 8 is a view taken along the line ■-■ in FIG. 1. FIG. 9 is a sectional view taken along line IX-IX in FIG. 1. FIG. 10 is a view taken along the line X-Xa in FIG. 6. [Explanation of symbols representing main parts in drawings] 1...Bending machine 21...Ram 33F,
33R...Mold holder 35F, 35R...Top die 69...Center division piece 71...Side division piece 73.75.77...Division piece 79F, 79R...Mold holder loading/unloading device 113...
Support member, 137...Mold moving device 159...
Second attachment/detachment device 189...first attachment/detachment device 191...center mold storage device j'11. ” Agent Yasuo Miyoshi, Patent Attorney; ゛1 Figure 6 Figure 7 Figure 9 Figure 1O

Claims (4)

[Claims] (1) In a bending machine, a mold holder that removably supports a plurality of split molds is attached to a ram that moves up and down, and the mold holder can be taken in and out from the ram to the outside of the crosspiece. A supporting member for supporting the mold holder taken out from the crosspiece by the mold holder taking-in/out device is provided on the side of the bending machine, and a substantially central portion of the mold holder supported by the supporting member is provided. The first step is to attach and detach the center mold to the
A center mold storage device housing a plurality of sensor molds for exchanging the center mold by the first mounting/detaching device is provided at a position close to the first mounting/detaching device, and is supported by a mold holder. A mold moving device is provided for moving the plurality of divided molds along the mold holder, and a second attachment/detachment device is provided for attaching and detaching the plurality of divided molds to and from the mold holder. Automatic mold changing device for bending machines. (2) The automatic die changing device for a bending machine according to claim 1, wherein the first attaching/detaching device and the second attaching/detaching device operate independently of each other. (3) The folding according to claim 1, wherein a plurality of split molds arranged symmetrically around a center mold are simultaneously moved by a mold moving device. Automatic mold changing device for processing machines. (4) Claim 1, characterized in that the second attachment/detachment device is provided corresponding to each split mold to be replaced.
The automatic mold changing device for the bending machine described in 2.