JP3485688B2 - Die changing equipment in bending equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, for example in a press brake as bending device, bending instrumentation that enables exchange center mold constituting a part of the upper die
The present invention relates to a mold exchanging device .

[0002]

2. Description of the Related Art Conventionally, a panel in which each end of four sides of a rectangular work is bent once or twice or more is used for a cabinet, a showcase, or the like. To manufacture such a panel, a work is bent by a bending device such as an ironing and bending machine.

Among the folding devices, as known from, for example, Japanese Patent Application Laid-Open No. 61-103626,
For example, dozens of thin-walled clamp dies that are center dies are attached to the center of the clamp dies that hold the work, and the number of thin-walled clamp dies is reversed according to the length of the work, and the length of the clamp dies is increased. Is being adjusted.

The above-mentioned thin clamp mold has a problem that it is weak in strength because it is literally thin and that machining is very complicated. In order to improve this problem, a thin clamp die is not used, but a large number of integrated center dies with a pitch of several mm are prepared, and one of the above center dies is selected according to the length of the work. There has been considered a die exchanging device of a bending apparatus in which a center die having a required length is selectively exchanged so that the length of the die can be easily adjusted.

[0005]

By the way, in the above-mentioned bending apparatus, the center provided in the longitudinal direction of the mold supporting beam provided at the lower end of the vertically movable frame is provided so as to be rotatable. A replaceable center mold provided in the mold replacement unit and the right and left sides of this center mold
And a movable die composed of a hollow die and a large number of split dies that are slidably provided on the left and right parts of the hollow die, and a fixed die arranged to face the movable die. It is designed to press the work with a die or perform bending work. Moreover, the center mold exchanging unit is pivoted to the die exchanging position of the die magazine provided on the rear side of the frame and moved in the left-right direction to exchange a desired center die. Therefore, since the center mold unit is moved in the left-right direction with respect to the mold replacement position of the mold magazine, there is a problem in the positioning accuracy of the center mold.

An object of the present invention is to replace the center mold replacement arm with a rotated position of the center mold replacement arm as a mold replacement position so that the mold replacement position is always constant. folding with improved positioning accuracy
A mold exchanging device in a buffing device .

[0007]

In order to achieve the above object, a mold exchanging device in a bending apparatus according to claim 1
Place the table at the center of the lower end of the upper table, which can be moved up and down.
A replaceable sensor attached to the provided center mold change arm.
And a hollow die provided on the left and right of the center die,
Plural slidably provided on the left and right sides of the hollowing die
An upper mold composed of a split mold and a member facing the upper mold.
Bending work is performed in cooperation with the lower die that is placed
In the folding machine, a plurality of
A mold magazine for accommodating the center mold is provided,
The center mold changing arm was swung with respect to the magazine.
The position of the center mold at this time is set as the mold replacement position,
Center mold stored in the mold magazine at the mold replacement position
Move the mold magazine to the left and right to replace
Provided freely, inside the center mold replacement arm
To the upper surface of the grip provided on the upper part of the center mold.
Install the existing hammer member and rotate the center mold change arm.
At the mold mounting position that has been moved, the hammer member
A movable block that can be engaged with the upper surface and the lower surface of the upper table.
Between the upper surface of the hammer member and the lower surface of the upper table.
Installed so that it can move back and forth between the moving block and the hammer
A state of being retracted between the upper surface of the member and the lower surface of the upper table.
In the state, the center mold change arm can rotate forward
Is installed on the left and right sides of the center die and the center die.
Release the contact interference and move the hollowing die closer to the left and right.
The main point is that it is provided so that it can be reversed .

In the bending apparatus according to claim 2,
The mold exchanging device is the bending device according to claim 1.
In the mold exchanging device, the gripping portion is the mold
The first engaging groove that engages with the mold holder provided in the
Second engaging member that engages with the engaging portion provided on the mold exchange arm
So that the mating groove and the first engaging groove and the second engaging groove intersect.
It is provided with a vertical groove provided and a holding piece that can be engaged with and disengaged from the vertical groove is
When provided on the center die exchange arm and the die holder,
In both cases, the grip is attached to the center mold changing arm.
Provided with a ball plunger that constantly presses against the groove side
Is the gist .

[0009]

Bending of the present invention according to claims 1 and 2
In a mold exchanging device in a working machine , a center mold and upper and lower molds, which are divided molds provided on the left and right parts of the center mold, are made to work together by vertically moving an upper table. The bending process is performed.

By selecting the center mold from a plurality of replacement center molds according to the length of the work and selecting the number of divided molds, bending work is performed to various work lengths. .

When selecting and exchanging the center mold from a plurality of center molds for replacement, the center mold exchanging arm is rotated backward by, for example, 180 degrees and stopped. This rotated position is the mold replacement position. With respect to the mold replacement position, the base forming the mold magazine provided at the rear of the upper table is moved in the left-right direction to position one of the pair of drums at the mold replacement position. Thus, the center mold provided in the center mold arm and the replacement center mold housed in the mold magazine are exchanged.

Since the mold replacement position is set so that the position where the mold replacement arm is rotated is used as the mold replacement position, the mold replacement position is always constant, and the positioning accuracy of the center mold is improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 1 and 2, for example, a press brake 1 as a bending device is provided with left and right side frames 3 which are erected, and a lower table on the lower front side of the side frames 3. 5 is fixed, and an upper table 7 that can move up and down is provided on the upper front side of the side frame 3.

A hydraulic cylinder 9 is provided on an upper portion of each side frame 3, and a lower end of a piston rod mounted on each hydraulic cylinder 9 is fixed to both sides of the upper table 7.

With the above structure, when the hydraulic cylinder 9 is operated, the upper table 7 is moved up and down with respect to the lower table 5 via the piston rod.

On the upper part of the lower table 5, a lower mold 1 is provided.
1, and an upper die 13 is provided below the upper table 7. A back gauge 15 is provided behind the side frames 3 and is movable back and forth for abutting and positioning a work.

With the above structure, the back gauge 15 is preliminarily positioned at a desired position and one end of the work is abutted,
By operating the hydraulic cylinder 9 to move the upper table 7 up and down, the work is bent by the cooperation of the upper mold 13 and the lower mold 11. By bending the four sides of the work in the above-described manner, for example, a box-shaped bent product can be obtained.

As shown in FIG. 2, a mold supporting beam 17 is integrally provided on the lower portion of the upper table 7 by welding or the like. This mold supporting beam 1
A replaceable center mold C of the upper mold 13 is provided in the longitudinal direction of 7, that is, substantially in the center in the left-right direction in FIG. On the mold supporting beams 17 on the right and left sides of the replaceable center mold C, left split molds L1 to L17 are provided via a left centering mold L0, and right sides are provided via a right centering mold R0. Split mold R1 to R1
7 is provided. These split molds L0 to L17, R
The length of 0 to R17 is, for example, 100 mm. As the center mold C, a center mold C0 having a length of 100 mm as a reference, for example, a length of 5 mm is increased.
It is possible to replace it by including ~ C19.

The left and right reference molds L1 to L17,
A mold selection cylinder 19 is provided above R1 to R17. Further, the mold supporting beam 17 is provided with opening / closing cylinders 21L, 21R. By operating the opening / closing cylinders 21L, 21R to select and operate each mold selection cylinder 19, the left side is opened. , One of the right side reference dies L1 to L17 and R1 to R17 is selected, and the length of the divided dies is determined to be a desired length. The opening / closing cylinder 21L,
21R, the connection state of each mold selection cylinder 19 is already known, and thus a detailed description thereof will be omitted.

The replaceable center mold C is carried out by a mold changing unit 25 of a mold changing device 23 provided at a substantially central portion on the rear side of the upper table 7. Moreover, the center mold C0 for various exchanges of the center mold C
Twenty to C19 are stored in the storage portion of the mold magazine 27 attached to the upper table 7 above the mold replacement unit 25.

As shown in FIGS. 3, 4 and 5, the mold exchanging unit 25 in the mold exchanging device 23 has a first wedge member 29, on the rear side of the upper table 7, as shown in FIGS. The fixed frame 33 is attached with a plurality of bolts via the second wedge member 31.

A rotating shaft 35 extending in the left-right direction (direction orthogonal to the paper surface in FIGS. 4 and 5) is rotatably supported on the fixed frame 33. The rear end of the center mold exchanging arm 37 is attached to the rotating shaft 35, and the center mold exchanging arm 37 is attached.
A center mold C is detachably provided at the tip of the.
A pinion 39 is attached to the rotating shaft 35.

On the other hand, a rotating air cylinder 41 is attached to the fixed frame 33, and a tip end of a piston rod 43 mounted on the rotating air cylinder 41 has a rack 45 extending in the left-right direction in FIG. One end is attached. This rack 45 is the pinion 3
9 is meshed.

With the above structure, the rotating air cylinder 41 is provided.
Is operated to extend the piston rod 43 to the right in FIG. 5, the rack 45 is moved together with the piston rod 43, so that the pinion 39 is rotated. The rotation of the pinion 39 causes the center mold exchanging arm 37 to rotate 180 degrees clockwise in FIG. 5 via the rotation shaft 35. The position of the center mold C provided on the rotated center mold changing arm 37 (the position indicated by the chain double-dashed line in FIG. 5) becomes the mold changing position K.

As shown in FIG. 3, a center mold C rotated by a rotating shaft 35 is positioned as a mold exchange position K at the lower center of the mold supporting beam 17 and substantially in the center thereof. ing. Bearings 47 are hung on both sides of the center mold C and integrated with the mold supporting beam 17. Each of the bearings 47 has a left-hand screw 49 that is rotatable.
A ball screw 49 in which an L and a right screw 49R are integrated is supported. Nut members 51L and 51R are screwed into the left screw 49L and the right screw 49R, respectively, and the left and right punching dies L0 and R0 are integrated with the nut members 51L and 51R, respectively.

Servo motor 5 is attached to the fixed frame 33.
3 is provided, and the output shaft 5 of this servo motor 53
A drive pulley 57 is attached to the device 5. On the other hand, a driven pulley 59 is mounted on the ball screw 49, and the driven pulley 59 and the drive pulley 57 are connected to the belt 6 by the belt 6.
1 is wound.

With the above structure, when the servo motor 53 is driven, the drive pulley 57 is rotated via the output shaft 55, so that the ball screw 49 is rotated via the belt 61 and the driven pulley 59. Due to the rotation of the ball screw 49, the left and right punching dies L0 and R0 are moved toward and away from the center die C via the nut members 51L and 51R.

On the upper rear side of the upper table 7, as shown in FIGS. 6, 7 and 8, the horizontal direction (the direction orthogonal to the paper surface in FIG. 6, the horizontal direction in FIG. 7). A plurality of guide rails 63 extending to are laid, and a movable base 67 is provided on each of the guide rails 63 via a plurality of linear guide blocks 65.

A tip of one piston rod 71 mounted on the double-headed air cylinder 69 is fixed to the upper table 7 by a mounting bracket 73, and a piston rod 75 of the other pistoned rod 75 mounted on the double-headed air cylinder 69 is fixed. The tip is fixed to the movable base 67.

Drum bases 77L and 77R are integrated on the left and right sides of the movable base 67. The upper drive sprocket 7 is located above and below the drum bases 77L and 77R.
9L, 79R and lower drive sprockets 81L, 81R are connected by a shaft 83 and are rotatably supported. Chains 85L and 85R are respectively wound around the upper drive sprockets 79L and 79R and the lower drive sprockets 81L and 81R. With these structures, a pair of drums 86L and 86R are formed.

Each of the chains 85L and 85R is provided with a die holder 87 as a die accommodating portion at an appropriate interval, for example, 1 each.
Each of the die holders 87 holds 0 pieces, and replaceable center dies C0 to C19 are detachably provided.

The upper table 7 is provided with a rotation drive motor 89, and a drive sprocket 93 is attached to an output shaft 91 of the rotation drive motor 89.
On the other hand, a drive sprocket 95 is mounted on the shaft 83 on which the drive sprocket 81R is mounted. A chain 97 is wound around the driven sprocket 95 and the drive sprocket 93.

As shown in FIG. 7, stopper members 99L and 99R are provided on both left and right sides of the movable base 67, and the stopper members 99L and 99R are also provided.
Stopper pins 101L and 101R corresponding to the above are provided on the upper table 7.

With the above construction, when the rotation drive motor 89 is driven, the drive sprocket 93 is rotated via the output shaft 91. The rotation of the drive sprocket 93 causes the lower shaft 83 to rotate via the chain 97 and the driven sprocket 95.
The R and 81L are rotated and the chains 85R and 85L are rotated.

By rotating the chains 85R and 85L,
The center molds C0 to C19 provided on the chains 85R and 85L via the mold holder 87 are rotated.

By operating the double-headed air cylinder 69 to expand and contract the piston rods 71 and 75, the movable base 67 moves left and right in FIG.
Stopper members 99L, 99 provided on the movable base 67
When R contacts the stopper pins 101L and 101R, the center mold C held by the chains 85L and 85R is positioned at the mold replacement position K.

Therefore, the operation when the center mold C is replaced while the center mold replacement arm 37 is rotated to the mold replacement position K (the condition shown in FIG. 6) will be described. First,
The center mold exchanging arm 37 holding the center mold C at the mold exchanging position K is rotated and positioned. Then, the rotation drive motor 89 is driven to drive the chains 85L and 85R to rotate, and the empty die holder 87 not holding the center die C is brought to the lower end and stopped. It is operated to move the empty mold holder 87 to the mold replacement position K. Next, the center mold C held by the mold exchanging arm 37 is removed and held by the empty mold holder 87.

Next, the movable base 67 is returned to its original position, and the center mold C to be held by the center mold exchanging arm 37 is selected. The selected center mold C is the chain 85L or 85R. Run to rotate to the bottom so that it stops. Next, the selected center mold C is moved to the mold exchange position K. The center mold C is held by the center mold exchanging arm 37, so that the center mold C can be automatically exchanged.

Then, the position where the center mold exchanging arm 37 is rotated is fixed as the mold exchanging position K, and the exchanging center mold C stored in the mold magazine 27 is moved left and right. The center die C can be automatically exchanged from the die magazine 27 to the center die exchange 37 or from the center die exchange arm 37 to the die magazine 27 by positioning at the die exchange position K. Moreover, it is possible to improve the positioning accuracy of the center mold C whose mold replacement position K is always constant.

Referring to FIGS. 4 and 9, a grip 103 is attached to the base of the center mold C with a plurality of bolts, and a first groove for engagement is provided on the lower and upper parts of the grip 103. 105 and a second groove 107 are formed. Also,
A holding piece 109 is provided on the mold changing arm 37 with a pin 111.
Is provided so as to be swingable with respect to a fulcrum, and the holding piece 109
Rear part (upper part in FIG. 4) and the mold changing arm 37
A spring 113 is attached between and. A vertical groove 103T is formed in the grip portion 103.

With the above-described structure, the holding piece 109 swings around the pin 111 as a fulcrum by the urging force of the spring 113, and the protrusion 109T at the tip of the holding piece 109 engages with the vertical groove 103T, so that the center metal is always kept. The mold C is held by the center mold exchanging arm 37.

As shown in FIG. 9, the center mold exchanging arm 37 is rotated by, for example, 180 degrees and the mold exchanging position K is reached.
When the holding piece 1 is positioned, the piston rod 117 of the air cylinder 115 provided on the fixed frame 33 extends to the left side in FIG.
09 resists the biasing force of the spring 113 and rotates clockwise around the pin 111 as a fulcrum in FIG. 9, so that the projecting portion 109T of the holding piece 109 is disengaged from the vertical groove 103T.

As shown in FIGS. 4 and 9, a hammer member 119 is mounted in the center mold exchanging arm 37, and a lower portion of the hammer member 119 is provided as shown in FIG. A center mold C is provided. The hammer member 119 is biased upward by the spring 121 in FIG. This hammer member 119
A moving block 123 is provided on the upper part of. An engaging portion 37K that engages with the second groove 107 is provided at the tip of the mold exchanging arm 37.

With the above configuration, the center mold exchanging arm 3
7 is rotated by 180 degrees, for example, and the mold replacement position K shown in FIG.
Then, the hammer member 119 is slightly moved downward by the urging force of the spring 121, and the upper surface (lower surface in FIG. 9) of the grip 103 of the center mold C and the hammer member 1 are moved.
Since a slight gap is formed between the upper surface of 19 and the center die C, it is possible to avoid interference with the center die C when the die is exchanged, and the die can be smoothly exchanged.

When the center mold exchanging arm 37 is rotated, for example, 180 degrees from the mold exchanging position K and set in the mold mounting position shown in FIG. 4, the load applied by the hammer member 119 to the center mold C is increased. Is transferred to the moving block 123, the clamping force is converted into a pressing force by the hammer member 119 so that the clamping force is applied between the lower surface of the hammer member 119 and the upper surface of the grip portion 103. Works. In addition, a ball plunger 120 is provided on the outer periphery of the engaging portion 37K.
It is pre-pressed before clamping by 20 to take the standard. Therefore, the center mold C can be accurately positioned on the center mold exchanging arm 37.
Moreover, the positioning is performed in the same manner even if it is repeated, so that the positioning accuracy can be improved.

The vertical groove 103T provided in the grip 103 of the center mold C allows the holding piece 109 to be easily engaged and disengaged, and the first groove 105 is provided in the mold magazine 27, the details of which will be described later. The lock piece can be easily engaged and disengaged.

When the rotating air cylinder 41 is operated, as described above, the center mold exchanging arm (also referred to as the center mold supporting member) 37 is rotated counterclockwise in FIG. 4, and the center mold C is rotated. Will be moved from the position of the solid line to the position of the chain double-dashed line in FIG.

Referring to FIGS. 4 and 10, the moving block 123 provided on the upper portion of the hammer member 119.
However, when the center mold C is rotated forward, it is moved to the position indicated by the dotted line in FIG. The movement of the movement block 123 is performed by the movement mechanism shown in FIG.

That is, in FIG. 10, movable base plates 133A and 133B are attached to the mold support beam 17 with a plurality of bolts, and guides extending in the left-right direction in FIG. 10 are provided inside the movable base plates 133A and 133B. The rail 135 is integrated. The moving block 123 is slidably provided on each of the guide rails 135.

A bracket 137 is attached to the left side of the moving block 123 in FIG. 10 with a plurality of bolts. Moreover, this bracket 137 has a long hole 13
9 is formed.

On the other hand, the rear side of the upper table 7 (see FIG.
A rotary actuator 141 is provided on the left side of FIG. A rotary shaft 143 of the rotary actuator 141 is rotatably supported by a base portion 145A of a rotary arm 145, and a tip portion 14 of the rotary arm 145 is supported.
5B is provided with a pin 147. This pin 147
Is accommodated in the long hole 139 of the bracket 137.

With the above structure, when the rotary actuator 141 is driven, the rotary shaft 143 moves to the position shown in FIG.
When it is rotated clockwise in
5 is also rotated in the same direction. As a result, the rotating arm 145
The pin 147 provided at the tip portion 145B of the
After moving within 39, the moving block 123 is guided by the guide rail 135 and moved leftward in FIG.

When the movable block 123 is returned to its original position, the rotary shaft 143 is rotated in the reverse direction, whereby the rotary arm 145 rotates counterclockwise in FIG. 10, and the tip end portion of the rotary arm 145 is rotated. 145B is the moving block 123
By pushing the left side wall of the moving block 123, the moving block 123 is guided by the guide rail 135 and returned to its original position.

Split mold L1 constituting the upper mold 13
The shapes of L17 to R17 (R1 to R17) are as shown in FIG. That is, in FIG. 11, an outer protruding portion 149 protruding outward is provided at a lower portion of the split molds L1 to L17 (R1 to R17), and a left punching mold L0.
An inwardly projecting portion 151 that can freely come into contact with the side surface of the (right side punching die R0) is provided.

With the above structure, when the bent product G is taken out from the mold as shown in FIG. 12, the rotary actuator 141 is first driven to avoid the moving block 123 shown by the dotted line in FIG. It is moved to the position so that it does not interfere with the hammer member 119.

Next, the rotating air cylinder 41 is operated to rotate the center mold exchanging arm 37 counterclockwise in FIG. 4 to move the center mold C from the position indicated by the solid line to the position 2 in FIG.
By turning the position indicated by the dotted line, that is, by slightly rotating it in the forward direction, the left and right left and right middle punching dies L0, R0
The contact with is released.

After that, the left and right punching dies L0, R0
When the split molds L1 to L17 and R1 to R17 are moved to the center side as shown by the arrows in FIG. 12, the left and right outward protruding portions 149 of the split molds L1 to L17 and R1 to R17 are bent products. Since it is pulled out from the G groove G _V ,
The bent product G can be easily taken out of the mold.

As shown in FIGS. 5, 6, 9 and 13, a pair of drums 86L and 86R are provided with die holders 87 (each 10 in this embodiment) which are storage parts. The tip portion 87A of each die holder 87 has a first groove 105 formed in the grip portion 103 of the center die C.
It is possible to engage and disengage.

A lock piece 153 is swingably provided by a pin 155 on the right side of each mold holder 87 in FIGS. 9 and 13. A lock pin 157 is provided at the tip of the lock piece 153. Moreover, FIG. 9 and FIG.
3, the spring 159 is interposed between the mold holder 87 and the upper portion of the lock piece 153. On the other hand, the vertical groove 103T is formed in the grip 103 of the center mold C.

With the above structure, the lock piece 153 is always rotated clockwise in FIG. 13 with the urging force of the spring 159 about the pin 155 as a fulcrum, so that the lock pin 157 is moved to the vertical groove 103T of the center mold C. Locked in. Therefore, the center mold C is the mold holder 8
It will always be held at 7.

As shown in FIGS. 13 and 14, the fixed frame 33 is provided with an air cylinder 163, and an arm member 167 is attached to the tip of a piston rod 165 mounted on the air cylinder 163. It is installed. As shown in FIG.
4, a lock release piece 169 extending in the vertical direction is attached with a plurality of bolts. The fixed frame 3
3, the lower end of the swing arm 171 is pivotally supported by a pin 173, and the upper end of the swing arm 173 is provided on the arm member 167 by a pin 175.

With the above construction, when the air cylinder 163 is operated, the piston rod 165 extends in FIG. 13, and the swing arm 171 connected to the arm member 167 rotates counterclockwise in FIG. 13 with the pin 173 as a fulcrum. It is rotated. As a result, the lock release piece 169
By pressing the upper end of the lock piece 153, the lock piece 153 is rotated counterclockwise in FIG. 13 against the biasing force of the spring 159 about the pin 155 as a fulcrum. Vertical groove 1 of mold C
After being unlocked from 03T, the center mold C is free from the mold holder 87.

Therefore, when delivering the center die C between the die exchange position K and the die holder 87, when delivering the center die C from the center die exchange arm 37 to the die holder 87, The lock piece 153 provided on the die holder 87 and the vertical groove 103T provided on the center die C are locked in the engaged state.

Further, when the center mold C is transferred from the mold holder 87 to the center mold exchanging arm 37, the lock piece 153 can be easily retracted from the lock position when the mold magazine 27 is moved left and right. Can be delivered. The length of the lock release piece 169 is only the maximum length of the center mold C in order to move the center mold C housed in the mold holder 87 of the pair of drums 86L and 86R by moving the center mold C left and right. Although necessary, in order to move the center mold C stored in the mold holder 87 of the drum 86L or 86R on only one side to the left and right and replace it,
The length of the lock release piece 169 may be at least ½ of the maximum length of the center mold C.

At the die exchange position K, the die holder 87
Side lock piece 153 is a vertical groove 103T on the center mold C side.
And the engaging portion 37K of the die exchanging arm 37 is engaged with the second groove 107 on the center die C side,
When the mold magazine 27 is moved left and right, the tip of the mold holder 87 is disengaged from the second groove 105 of the center mold C, and the center mold C is held by the center mold exchanging arm 37.

In order to hold the center mold C in the empty mold holder 87 at the mold changing position K, the mold holder 87 is used.
Is engaged with the first groove 107 of the center mold C, and the lock pin 157 of the lock piece 153 is engaged with the vertical groove 103T of the center mold C. Furthermore, the second of center die C
The center mold C is held by the mold holder 87 by removing the tip of the mold holder 87 from the groove 107.

The present invention is not limited to the examples of the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[0070]

As can be understood from the above description of the embodiments, according to the inventions of claims 1 and 2 , the center mold exchanging arm is located below the upper table when exchanging the center mold. A position rotated from a certain mold mounting position is positioned as a mold replacement position, and the center mold for replacement stored by moving the mold magazine to the left and right is positioned at the mold replacement position and the center mold is moved. By exchanging the mold, the mold replacement position is always constant, the positioning accuracy of the center mold can be improved, and the left and right moving mechanisms can be simplified to reduce the cost. In addition, the center die change arm has a
The hand that can be engaged with the upper surface of the grip provided on the upper part of the
This center mold change arm is pivoted
The upper surface of the hammer member and the
Hammer a movable block that can be engaged with the lower surface of the upper table.
-Provided so that it can move back and forth between the upper surface of the member and the lower surface of the upper table
Therefore, retract the moving block from above the hammer member.
The center mold change arm to the front of the bending machine.
It is possible to rotate it slightly and to the left and right of the hollow die
It becomes possible to approach and depart from
The length of the mold part can be easily changed . Well
According to the invention of claim 2, the center mold is the mold
For the gin mold holder, the first engaging groove and the vertical groove are used.
The second engaging groove for the center mold changing arm
It is held by the vertical groove, and the center die replacement
Frame and the mold holder that engage with the vertical grooves.
By disengaging each holding piece,
From the center die to the mold exchange arm or vice versa.
The mold can be reliably replaced. In addition, center mold
Always hold the gripping part of the
Therefore, the positioning accuracy of the center mold is improved .

[Brief description of drawings]

FIG. 1 is a left side view of a press brake as a bending device according to an embodiment of the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is an enlarged view of a portion indicated by an arrow III in FIG.

FIG. 4 is an enlarged cross-sectional view of the IV arrow part in FIG.

FIG. 5 is an enlarged cross-sectional view of the V arrow view part in FIG.

FIG. 6 is an enlarged cross-sectional view of a VI arrow portion in FIG.

FIG. 7 is a front view of a movable base portion of the mold magazine.

FIG. 8 is a front view of a rotary drive portion that rotates a pair of drums in the mold magazine.

FIG. 9 is an enlarged side view of a portion where a center mold exchanging arm is rotated to a mold exchanging position.

FIG. 10 is an enlarged plan view of a moving block portion in FIG.

FIG. 11 is an enlarged front view of the split mold.

FIG. 12 is an operation explanatory view of taking out a bent product from the mold.

FIG. 13 is another enlarged view of the portion where the center mold exchanging arm is rotated to the mold exchanging position.

FIG. 14 is a view on arrow XIV in FIG. 13.

[Explanation of symbols]

1 Press brake (folding device) 7 Upper table 11 Lower mold 13 Upper mold 23 Mold changing device 25 Mold changing unit 27 Mold Magazine 33 fixed frame 37 Center mold change arm (mold support member) 37K engaging part 67 Movable base 77 drum bass 86L, 86R drum 87 Mold Holder (Mold Storage) 103 grip 103T vertical groove 105 first groove 107 second groove 119 Hammer member 123 Moving block 141 rotary actuator 149 outward protrusion 151 Inward protrusion 153 Lock Piece 157 Lock Pin 169 Lock release piece C, C0 to C20 center mold L0, R0 hollow die L1 to L17, R1 to R17 split mold G bending products

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 5/02 B21D 5/04 B21D 37/04

Claims (2)

(57) [Claims] 1. A substantially lower end of an upper table which is vertically movable.
Replaceable by mounting on the center mold exchange arm provided in the center
Functioning center mold and hollowing provided on the left and right of the center mold
Provided in the mold and slidable on both left and right sides of the hollow mold
An upper mold composed of a plurality of divided molds, and the upper mold
Bending on the work in cooperation with the lower mold placed opposite to
In the bending machine that performs processing,
Set up a mold magazine to store multiple center molds.
The center mold replacement arm for the mold magazine
The position of the center mold when turning the
As a result, the mold was stored in the mold magazine at the mold replacement position.
Move the mold magazine left and right to replace the center mold.
It is possible to move and position to the center mold
Above the grip provided in the upper part of the center mold in the replacement arm
Provided with a hammer member that can be engaged on the surface, and replace the center mold
At the mold mounting position where the arm swivels,
Is freely engageable with the upper surface of the mer member and the lower surface of the upper table.
Move the moving block to the upper surface of the hammer member and the upper table.
It is installed between the bottom of the bull so that it can move forward and backward
From between the upper surface of the hammer member and the lower surface of the upper table
In the retracted state, the center mold replacement arm
It is rotatably provided in the direction of
The contact interference in the left and right direction is released, and the hollow die is left and right
Bending process characterized by being provided so that it can approach and separate from each other
Equipment mold changing device . 2. The mold of the bending apparatus according to claim 1.
In the exchanging device, the grip is attached to the mold magazine.
A first engaging groove for engaging a provided die holder, and the center
Second engaging groove that engages with the engaging portion provided on the mold exchanging arm
And so as to intersect the first engaging groove and the second engaging groove.
The vertical groove is provided, and the holding piece that can be engaged with and disengaged from the vertical groove is provided in the above-mentioned
The same as the one provided on the mold replacement arm and the mold holder.
Then, attach the grip to the center mold changing arm.
The provision of a ball plunger that constantly presses the groove side
Mold changing device of the characteristic bending device .