JPH0260409B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a bending machine for bending the edge of a workpiece, and the present invention provides a bending machine that bends the edge of a workpiece by changing the effective mold width of an upper mold according to a change in the bending width of the workpiece. More specifically, it is a bending machine that can change the length of the workpiece, and more specifically, the length of the upper die is determined by closely fitting the required number of split upper dies out of a number of split upper dies provided at the lower end of the ram according to the length of the workpiece. This invention relates to a bending width changing device for a bending machine that bends the edge of a workpiece using the upper die and the lower die or in cooperation with a wing beam.

(Prior Art) For the doors, lids, etc. of metal cabinets in electrical equipment and furniture, panels in which the edges of plate materials are bent into a U-shape or an L-shape are often used. Generally, such panels are made by bending the short side edges of the workpiece, and then folding the long side edges into the same shape to match the inside of the short side bend. .

Therefore, conventional bending machines have a large number of specialized upper molds for bending molds depending on the length of the workpiece, and the upper molds are replaced manually each time the workpiece dimensions change, resulting in high costs. In addition, it did not improve work efficiency and was dangerous.

In order to improve these shortcomings, the upper mold is made into a split type, and molds with different lengths are combined, and the required number of split upper molds are installed manually depending on the length of the workpiece, or by using a sliding type or rotating type. There is a known method for entering and exiting the building by making a ceremony (for example, the
(Refer to Publication No. 16203 and Publication No. 1982-23051).

(Problems to be Solved by the Invention) By the way, among the above conventional examples, the slide type is equipped with a pair of left and right split horizontal slide mechanisms, and the width of the upper mold is adjusted while controlling these two slide mechanisms. Therefore, two sets of various devices are required for the split-type lateral slide, resulting in two problems: difficulty in control operation and enlargement of the folding machine. Furthermore, this one is 50mm.
Since it uses a split mold with two widths of 55 mm, it is necessary to adjust the loading position onto the lower mold from left to right depending on the width of the workpiece, which makes loading work cumbersome. .

In addition, the rotary type has a second intermediate split type rotary operation shaft, a screw shaft for sliding the corner block, etc. inside the upper mold body attached to the lower end of the ram.
For the wide first intermediate split type, each gear is equipped with a gear, a rack that meshes with the rack, and a hydraulic cylinder that moves the rack up and down, which makes the device complicated and large. In addition, since the split die is rotated to the rear from under the ram, the ram is subjected to a large amount of rearward bias. Therefore, it becomes necessary to increase the strength of the ram support structure, resulting in an even larger device.

Therefore, the present invention successfully combines the advantages of the sliding type, which does not require consideration of the unbalanced load on the ram, and the advantage of the combined structure of the narrow-width split type and wide-width split type, which allows the workpiece loading position to be kept constant. At the same time, we have made the equipment more compact and simplified the mold replacement work. At the same time, we have made it possible to accurately move narrow split molds in and out, and to make a series of changes without the troublesome work of replacing molds like with conventional equipment. The purpose is to provide a mold that can be bent on both short and long sides.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained below using FIGS. 1 to 10 corresponding to embodiments.

In the present invention, one corner block 7 is suspended from the lower surface of the ram 4 in the bending machine as described at the beginning. Also, a guide groove 6 is provided along the longitudinal direction on the lower surface of the ram.
A large number of first intermediate split molds 8 are suspended so as to be movable laterally.

In addition, the moving frame 16 and the first intermediate split mold 8 are mounted on the back of the ram 4 so that they can be forcibly moved laterally.
Slide mechanism 3 that moves laterally by the lateral movement of 6
2 will be provided. The slide mechanism 32 includes one hook pin 35 that selectively and detachably engages with the hole 11 provided on the back surface of the first intermediate split mold 8.

The other corner block 12 and the first
A large number of second intermediate divided molds 13, which are thinner than the intermediate divided molds 8, are mounted side by side in a close state, and the other corner block 12 and these second intermediate divided molds 13 are mounted side by side.
... is configured to be able to forcibly move in and out from the rear of the back surface of the first intermediate split mold 8 toward the front.

The forward movement process of the second intermediate split mold 13 first includes a selection process to select the required number of molds, and then the selected one connects its front end to the front end of the first intermediate split mold 8. It is divided into two stages: a forward stage where it is pushed out until it is lined up in a straight line,
In this selection process, position regulation is performed to align the front ends of the second intermediate split molds 13 to be selected in a horizontal straight line. This selection involves, in addition to the lateral movement of the moving frame 16, the extrusion of the second intermediate divided molds 13 in the mold number selection movement process from the rear of the back of the first intermediate divided mold 8 to a position slightly forward of the rear surface existing position. The controlling pusher 19 and the individual second intermediate split molds 13...
This is done by a buffer structure 21 which elastically absorbs the forward resistance of the divided molds 13 during the mold number selection movement stroke and allows the pusher 19 to push forward.

Further, the position regulation of the selected second intermediate divided molds 13 is performed by a position regulating mechanism 37 having a regulating plate 41 that moves forward and backward within the back and forth movement locus of these second intermediate divided molds 13.

Further, a tailgating mechanism 28 is provided which integrally pushes the selected second intermediate split mold 13 and the other corner block 12 further forward, and this tailgating mechanism 28 is connected to the aligned second intermediate split mold 12. A position defining mechanism 38 for positioning the molds 13 is provided.

(Function) When changing the bending width, the slide mechanism 32 is laterally slid by moving the moving frame 16 laterally, and the first
The intermediate split molds 8 are guided by the guide grooves 6 of the upper mold main body 5 and are laterally slid along the longitudinal direction of the upper mold main body 5. Then, between the outermost one of the necessary number of first intermediate divided molds 8 which are brought into close contact with one corner block 7 side and the unnecessary one next to this, there is a corner block 12 of the other side and the required number of pieces. Second intermediate split mold 13
The moving frame 16 is stopped at the time when a gap with a size that is the sum of the above is formed. Next, the moving frame 16 is further horizontally slid in the same direction to move the other corner block 1.
2 and the second intermediate divided molds 13 are carried to the rear of this gap, and then the entire second intermediate divided molds 13 are pushed forward by the pusher 19. However, in this case, since the gap size is only as large as the number of molds required, the front ends of the divided molds 13 other than those required are on the back side of the outermost first intermediate divided mold 8. However, due to the movement of the buffer structure 21, the pusher 19 moves further, and only the necessary number of groups of divided molds 13 are successively pushed forward a little. Prior to this extrusion, the regulating plate 41 of the position regulating mechanism 37 enters into the locus of movement of these intermediate divided molds 13, and the selected second intermediate divided mold 13 is thereby moved to the end of its travel stroke. The front end is aligned, and the number of molds is selected.

Further, these selected second intermediate split molds 13... group are collectively pushed forward by a tailgating mechanism 28.
However, prior to this, the selected second intermediate split mold 13 and the other corner block 1 are pushed forward by the position defining mechanism 38.
2, the front ends of both the blocks 7 and 12 are arranged horizontally in a straight line, and when pushed forward and placed in parallel with the first intermediate divided mold 8..., each corner block 7, 12 and each intermediate divided mold 8, 13... The front ends of the molds are neatly aligned in a horizontal straight line and arranged side by side, so that the length of the upper mold can be changed with the front ends neatly aligned.

Therefore, the width can be changed using the one corner block 7 side as a zero reference, and the first intermediate divided mold 8... can be changed only by horizontal sliding, and the second intermediate divided mold 13 can be changed.
Since the length of the upper die is changed only by the back and forth movement of the ram, there is no unbalanced load on the ram.

(Example) Next, an example in which the bending width changing device of a folding machine according to the present invention is applied to a wing bender (folding machine) will be described in detail based on the descriptions in FIGS. 1 to 7. .

(Structure of Upper Mold) The bending machine according to the present invention includes upper and lower molds 1 and 2 and a wing mold 3.

The upper mold according to the present invention has two corner blocks 7,
12. The first large block sandwiched between both blocks
It consists of an intermediate divided mold 8... and a narrow second intermediate divided mold 13. In the example shown, two corner blocks with a width of 127.5 mm and a first intermediate divided mold 18 with a width of 50 mm are used.
The case is shown in which nine second intermediate split molds each having a diameter of 5 mm are used.

Therefore, in the upper mold 1, an upper mold main body 5 having a downward U-shaped cross section is attached to the lower part of the ram 4, and one corner block 7 is suspended from one end of the lower part of the upper mold main body 5.
A large number of first intermediate split molds 8 having a larger width are suspended toward the other end.

A dovetail shape 9 is integrally protruded from the inner bottom of the U-shaped guide groove 6 of the upper mold body 5, and each intermediate divided mold 8...
A dovetail groove 10 to be inserted into the dovetail shape 9 is formed in the upper part of the upper mold body 5, and each intermediate divided mold 8 is hung movably along the longitudinal direction of the upper mold body 5. Further, on the back surface of each intermediate divided mold 8..., an engaging hole 11 is bored into which a hook pin (described later) for moving the intermediate divided mold 8 along the longitudinal direction of the upper mold body 5 is fitted. .

(Configuration of the other corner block and the second intermediate divided mold) On the other hand, the other corner block 12 and a large number of narrow second intermediate divided molds 13 are located below the back side of the upper die main body 5. , are provided so as to be movable along the longitudinal direction and the front-rear direction of the upper mold body 5.
Specifically, a pair of dovetail molds 14 (the upper one is not shown) are integrally provided on the back surface of the upper mold 1 along its longitudinal direction at a predetermined interval above and below, and furthermore, on the back side thereof. A movable frame 16 supported by threaded screw rods 15 arranged in parallel at an appropriate interval is disposed on the movable frame 16, and the other corner block 12 and the second intermediate split mold 13 are mounted closely side by side on this movable frame 16. ing. screw rod 15
Both ends are held on the back surface of the upper mold 1 so that they can only rotate freely, and one end is connected to a servo motor (not shown) for forward and reverse rotation. This causes the moving frame 16 to reciprocate along the longitudinal direction of the upper mold body 5.

The other corner block 12 has its front end moved from the same level as the front end of the first intermediate split mold 8 by a hydraulic cylinder 17 held by a support block body 17a whose front end is fixed to the lower surface of the moving frame 16 on the rear side. It is configured to be able to move freely in and out to a standby position slightly behind the rear end of the first intermediate split mold 8.

In the figure, 121 is a guide rod integrally connected to the rear end of the other corner block 12, and a dovetail type 123 is fitted into a pair of front and rear guide bodies 122, 122 fixed to the lower surface of the moving frame 16. . Further, 17A is a piston rod of the fluid pressure cylinder.

The second intermediate divided mold 13 is formed to be long in the front and back (approximately 2.5 times that of the first intermediate divided mold), and a number selection mechanism 18 for the second intermediate divided mold 13 is provided on the back side thereof. The number of molds can be increased or decreased depending on the width of the workpiece.

(Configuration of the mold number selection mechanism) Specifically, the configuration of the mold number selection mechanism 18 includes a pusher 19 having a width equal to the entire width of the group of second intermediate divided molds 13, and a pusher 19 that moves this back and forth. The fluid pressure cylinder 20 and each second intermediate split mold 13
It consists of a buffer structure 21 provided within the pusher 19 corresponding to... As shown in FIG. 4, this buffer structure 21 includes holes 22 bored in the front surface of the pusher 19 corresponding to the second intermediate split molds 13, springs 23 loaded inside the holes 22, and springs 23 loaded therein. It is formed of a pin 24 whose tip is always projected forward from the front surface of the pusher 19 by a spring 23, and the pin 24 is loaded so as to be retractable against the elastic force of the spring 23. There is.

(Structure of Tailgating Mechanism) 25... are through holes 25... provided in the left-right direction at equal dimensional positions from the front end of the second intermediate split die 13... at equal positions near the tip of the second intermediate split die 13..., and selected. The hook pin 29 of the tailgating mechanism 28 that moves the required number of second intermediate divided molds 13 to the front end positions of the first intermediate divided molds 8 can be inserted therethrough. In the figure, 27a and 27a are side plates of the container 27 which also serve as guide plates, which are provided to sandwich the second intermediate divided molds 13 from the left and right sides, and 27b is a bottom plate.

The tailgating mechanism 28 is formed of a fluid pressure cylinder 30 whose axis is along the longitudinal direction of the upper mold body 5 and its piston rod, and this piston rod functions as the hook pin 29. Specifically, it is designed to be loaded into the other corner block 12, and a round hole 310 extending along the longitudinal direction of the upper mold body 5 is provided in the upper part of the other corner block 12 to open the cylinder chamber 311. and the cylinder 3
A piston rod 312 is loaded into the piston 11 with its tip facing one corner block 7, and the other opening of the round hole 310 is closed 313. Therefore, it goes without saying that this tailgating mechanism 28 can be moved back and forth with the other corner block 12 by the other hydraulic cylinder 17.

(Configuration of slide mechanism) 32 is a moving frame 16 on the side of the other corner block 12.
A slide mechanism of the first intermediate split mold 8 provided below integrally projects forward from the front end of the fluid pressure cylinder 33 and its piston rod 34, which are fixed to the lower surface of the moving frame 16 with their axes along the front-rear direction. It consists of a hook pin 35 provided and a piston rod 34.
By moving the hook pins 35 in and out, the hook pins 35 are inserted into and removed from the engagement holes 11 formed on the back surfaces of the first intermediate divided molds 8. In the engaged state, by moving the moving frame 16, the required number of first intermediate divided molds 8 are moved. 8 along the longitudinal direction of the upper die main body 5.

In the figure, 351 is a guide frame for guiding the hook pin 35 fixed to the front lower surface of the movable frame 16, and 352 is a connector for connecting the hook pin 35 to the piston rod 34.

(Structure for regulating the position of the second intermediate split mold) The structure for regulating the position of the second intermediate split mold 13... is on the upper side near the rear end of the second intermediate split mold 13...
Notches 36 cut at equal dimensional positions from the front end...
and the position regulating mechanism 3 acting on this notch 36...
7, and a position defining mechanism 38 for the tailgating mechanism 28, specifically configured as follows.

The notches 36 are formed as recesses cut into a rectangle with a predetermined length along the front-rear direction of the second intermediate split mold 13.

Position regulating mechanism 37 acting on this notch 36...
has the same width as the entire width of the group of second intermediate divided molds 13, and is shorter than the longitudinal dimension of the notches 36, and is arranged above the notches 36, with the axis line Fluid pressure cylinder 39 facing in the vertical direction
A regulating plate 41 whose upper portion is fixedly connected to the lower end of the piston rod 40 and whose lower end is inserted into the insertion hole 37A provided through the moving frame 16;
A movable support frame 43 that supports the movable support frame 9 and is movable back and forth in the front and rear directions by means of a dome-shaped guide 42 provided on the upper surface of the movable frame 16;
The hydraulic cylinder 45 is fixed on the movable frame 16 with its axis running in the front-rear direction, and the tip of a piston rod 44 is fixedly connected to the back surface of the movable support frame 43. In the figure, 37B is a guide for smoothing the vertical movement of the regulating plate 41. The regulating plate 41 is fitted into the notch 36 and selected when the second intermediate divided mold 13 is in a fixed standby position slightly behind the back surface of the first intermediate divided mold 8. It functions as a positioning tool for correctly aligning the through holes 25 of the second intermediate divided molds 13 to be selected horizontally, and also serves as a positioning tool for correctly aligning the through holes 25 of the second intermediate divided molds 13 to be selected.
It also has the function of controlling the return of the remaining second intermediate split molds 13 to the above-mentioned standby position.

(Position regulation mechanism of tailgating mechanism) Mechanism 38 for regulating the position of tailgating mechanism 28
, the axis line is along the vertical direction, and the piston rod 4
A hydraulic cylinder 48 is provided on the movable frame 16 via a support stand 47 so as to move the piston rod 6 downwardly. It consists of a movement regulating plate 49 that regulates the backward movement of the other corner block 12 in the shape of a front view gate that protrudes downward through the movement of the corner block 12, and a fluid pressure for moving this other corner block 12 back and forth. The movement regulating plate 49 is moved in and out of the rear side of the connecting block 50 fixed to the rear side of the other corner block 12 for firmly connecting the front end of the piston rod 17A of the cylinder 17.
The through holes 25 of the second intermediate split mold 13 to be selected and the hook pins 2 of the tailgating mechanism 28
9, so that the hook pin 29 can be easily inserted into the through hole 25.

In the figure, reference numeral 51 denotes a pusher 5 that is supported by the dome shape 9 of the U-shaped groove 6 of the upper die main body 5 and reciprocates along the groove 6.
2 and a fluid pressure cylinder (not shown) for moving this pusher 52.

It goes without saying that the configuration shown in the above embodiments can be applied not only to wing benders, but also to press brakes and even coki benders.

Next, the operation of the above embodiment will be explained based on FIGS. 7 to 10.

FIG. 8 shows a case where both corner blocks 7, 12 and all the intermediate divided molds 8, 13 between them are used to form an upper mold having a maximum length (for example, 1200 mm).

If the length of the workpiece needs to be changed from this state, the actual length of the upper mold is changed by the following operation. For example, as shown in Figure 9, if you want to bend the short side of 575 mm, the first intermediate split mold
It is necessary to shorten the length of the upper mold by a total of 625 mm for 12 molds and 5 for the second intermediate split mold, but the procedure is as follows.

First, from the state shown in FIG.
The hydraulic cylinder 31 that moves the hydraulic cylinder 17 and the tailgating mechanism 28 back and forth is actuated to move the other corner block 12 and the second intermediate split mold 13...all slightly behind the back of the first intermediate split mold 8... Retire to the standby position (Figure 10A). Next, by operating the servo motor that moves the moving frame 16 and rotating the screw rod 15, the slide mechanism 32 moves the 12th piece of the first intermediate split mold 8 (from the one corner block 7 side This moving frame 16 is laterally slid to a position opposite to the back side of the first intermediate split mold (piece).

Next, the hook pin 35 of the slide mechanism 32 is inserted into the engagement hole 11 of the twelfth first intermediate split mold 8 by operating the fluid pressure cylinder 33 (FIG. 10B), and this time, the tip The servo motor is rotated in the opposite direction to horizontally slide the moving frame 16 in the original direction. As a result, the twelve first intermediate divided molds 8 are pushed away from the first corner block 7, and a gap is formed between the sixth and seventh molds. When this distance reaches the sum of the other corner block 12 and four second intermediate split molds 13, the operation of the servo motor is stopped (FIG. 10C).

Next, the fluid pressure cylinder 39 of the position regulating mechanism 37 is operated to move the regulating plate 41 downward, and the lower end is placed in the standby position in the notch 3 of the group of second intermediate divided molds 13.
6. Put it in...

Next, the hydraulic cylinder 17 of the other corner block 12 is actuated to project the other corner block 12 from the standby position to the front by a suitable distance beyond the rear position of the first intermediate split mold 8 (FIG. 10D). Then, a gap is created between the back surface of the connecting block 50 and the front surface of the supporting block body 17a of the fluid pressure cylinder 17, so when the gate-shaped movement regulating plate 49 of the position regulating mechanism 38 is lowered, this gap is created. The piston rod 17A is thrust into the gap by sandwiching both the left and right sides of the piston rod 17A. When this plunge is completed, the fluid pressure cylinder 17 is operated again, and the piston rod 1 is moved in the opposite direction.
When 7A is retired, this other corner block 12
moves backward, and the back surface of the connecting block 50 comes into contact with the front surface of the movement regulating plate 49, stopping the operation of the fluid pressure cylinder (Fig. 10, K-1). This stop position is set so that the front end of the other corner block 12 protrudes slightly forward (approximately 3 mm in practice) from the position where the back surface of the first intermediate split mold 8 exists. The front and rear width (approximately 6 mm) is set.

Next, the fluid pressure cylinder 20 of the model number selection mechanism 18
operates to push the pusher 19 forward. The amount of extrusion is set such that the front ends of the second intermediate divided molds 13 are approximately 3 mm in front and rear of the rear surface of the first intermediate divided molds 8, respectively, and are approximately 6 mm in total.

Due to the extrusion action of the pusher 19, all of the second intermediate divided molds 13... are pushed forward, but for the five pieces on one corner block 7 side, there is a sixth first intermediate divided mold 8 in front of them. Therefore, the front end of these five second intermediate split molds 13...
It comes into contact with the back surface of the intermediate split mold 8. However, since the pusher 19 is pushed further forward, the four pieces to be selected are further pushed forward, but the buffer structure 21 provided on the pusher 19, that is, the spring 23 is elastically applied via the pin 24. , thereby allowing the pusher 19 to move forward. However, this forward movement is also stopped when the rear end edges of the notches 36 come into contact with the back surface of the regulating plate 41. This stopping position is a fixed position in which the front ends of the four second intermediate divided molds 13 protrude slightly forward (about 3 mm) from the rear positions of the first intermediate divided molds 8. By doing this, the second of the four
The positions of the group of intermediate divided molds 13 and the other corner block 12 are regulated, and as a result, the through holes 25 of these four second intermediate divided molds 13...
and the tailgating mechanism 2 provided in the other corner block 12.
The piston rods 29 of 8 are correctly positioned on the same axis, and thereby the second intermediate split mold 13
The selection of... and the position regulating action of these second intermediate split molds 13... and the tailgating mechanism 28 are completed.

When the selection of the second intermediate split molds 13 is completed, the fluid pressure cylinder 30 of the tailgating mechanism 28 is operated to cause the hook pin 29 to protrude and
It is inserted into the through hole 25 of.... By this,
These four second intermediate divided molds 13 are integrated with the other corner block 12 (FIG. 10). In this case, the four second cards that were selected and slightly protruded forward
The through-holes 25 of the group of the intermediate divided molds 13 and the five second intermediate divided molds 13 that are in contact with the back surfaces of the first intermediate divided molds 8... The former protrudes slightly forward. Since the relative positional relationship is maintained as follows, the 10th
As shown in Figure H-1, after the hook pin 29 is inserted up to the fourth through-hole 25 of the former, its tip abuts the side surface of the fifth second intermediate split mold 13, and the hook pin 29 is inserted into the former through-hole 25. The protrusion of is inhibited, and the ejection operation is automatically stopped.

Next, the fluid pressure cylinder 20 of the model number selection mechanism 18
is actuated to move the pusher 19 backward, and at the same time actuate the fluid pressure cylinder 39 of the position regulation mechanism 37 of the second intermediate split mold 13 to move the regulation plate 41 upward and prevent it from engaging with the notch 36. unlock. or,
The fluid pressure cylinder 48 of the position defining mechanism 38 of the tailgating mechanism 28 is operated to retire the piston rod 46, move the movement regulating plate 49 upward, and pull it out from between the connecting block 50 and the support block body 17a. Figure 10).

The hydraulic cylinder 17 is then actuated to push the other corner block 12 forward. The four second intermediate split molds 13 selected by this extrusion are also transferred to the other corner block 1 through the tailgating mechanism 28.
The front ends of both molds 2 are aligned horizontally and pushed forward in a unified state, and when their front ends coincide with the front end of the first intermediate split mold 8, the operation of the fluid pressure cylinder 17 is stopped.

Thereafter, the lock of the servo motor that rotates the threaded rod 15 for horizontally sliding the moving frame 16 is released to enable free rotation, and then the die clamper 51 is used to remove the 12 first intermediate split molds 8.
...By pressing the outermost split mold 8 of the group (the rightmost end in the figure) toward one corner block 7, the other corner block 12 is pressed toward the one corner block 7, and each corner block 7 is , 12 and the first and second intermediate split molds 8, 13 are arranged as a series of molds closely arranged side by side, thereby reducing the length of the upper mold (FIG. 10G).

In order to return from the state shown in FIG. 9 to the state shown in FIG. The four second intermediate split molds 13... are moved backward together and returned to the standby position. Next, the hook pin 29 of the tailgating mechanism 28 is retired and the four second
The intermediate split mold 13 is pulled out from the through hole 25, and then the regulation plate 41 is moved down again to make all the notches 36.
Then, by retiring the hydraulic cylinder 45 and moving the movable support frame 43 rearward, the regulating plate 41 is moved rearward. The five second intermediate divided molds 13 left by this movement are returned to the standby position.

Next, the moving frame 16 is slid to the right, the slide mechanism 32 is moved to the rightmost rear of the excluded 12 first intermediate divided molds 8, and the hook pin is inserted into the engagement hole 11 of the divided mold 8. 35 and engage them, then slide the moving frame 16 to the left again to move the 12 first intermediate split molds 8... as a whole toward one corner block 7 side, and 1st
The intermediate divided molds 8 are placed in series next to the six selected first intermediate divided molds 8, and then the hook pins 35 are pulled out, the moving frame 16 is moved to the right again, and the other corner The blocks 12 and the second intermediate divided molds 13 are moved to the rightmost side of the first intermediate divided molds 8. After that, the tailgating mechanism 28
The hook pins 29 of the second intermediate divided molds 13 are inserted through all the through holes 25 of the second intermediate divided molds 13, and then the other corner block 12 is pushed forward by the hydraulic cylinder 17. The other corner block 12 is juxtaposed with its front end aligned with the front end of the first intermediate split mold 8. Thereafter, by operating the die clamper 51, both corner blocks and the first and second intermediate split molds are arranged closely side by side and returned to their original state.

Needless to say, the above-mentioned length of the upper die can be easily changed by push button or NC control depending on the length of the side of the workpiece.

(Effect) In this invention, the first intermediate divided mold 8..., the second intermediate divided mold 13... and the other corner block 12
By making the structural device that moves each of the parts external to the upper mold body, etc., rather than internally, the overall structure of the device can be simplified and downsized, and it is also easier to repair and inspect. It has the advantage of being easy to use. Also the first
It is possible to horizontally slide the intermediate split type 8 with a single slide mechanism.In addition, even if it is an exterior type, there is a slide mechanism on the back side of the ram, the other corner block, and the second intermediate split type. Since only the molds and their actuating devices are provided, unbalanced loads on the ram are less likely to occur, which has the advantage of further downsizing.

Furthermore, since the first intermediate split mold is moved left and right along the guide groove 6, and only the other corner block 12 and second intermediate split mold 13 are pushed forward to set the width, After being set, the front edges of each intermediate split mold and both corner blocks are neatly aligned in a straight line, and like a conventional rotary type, the split molds are separated by different rotation angles due to manufacturing errors of individual parts. The front edge becomes irregular in a zigzag shape, and this does not cause the defect that this appears as an uneven pattern at the bending corner of the workpiece, and a beautiful corner can be formed.

In particular, in the present invention, the front ends of the second intermediate split mold 13 to be selected and the other corner block 12 can be arranged side by side neatly in a horizontal straight line by the position regulating mechanism 37 and the position defining mechanism 38 for each. The second intermediate split mold 1 should be selected in order to be able to finish the bent corners of the workpiece more beautifully without uneven patterns and to increase the product value.
3... and the other corner block 12, that is, the hook pin 29 of the tailgating mechanism 28
Smooth insertion and removal into the intermediate split type through-holes 25 can be successfully achieved, contributing to improved work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an enlarged perspective view of the main part, with the moving frame and various devices above it omitted; Fig. 2 is an enlarged perspective view of the main part, showing the moving frame and various devices above it; The figure is a partially cutaway enlarged cross-sectional view of the buffer structure, Figure 4 is an enlarged cross-sectional view of the tailgating mechanism, Figure 5 is a partially cutaway cross-sectional view of the slide mechanism, and Figure 6 is the second
FIG. 7 is an enlarged sectional view of the position regulating mechanism of the intermediate split type. FIG. 7 is an enlarged view of the position regulating mechanism of the tailgating mechanism. A is a side view, B is a front view, and FIGS. 8 and 9 are front views of the upper die. Figures 10 and 10 are explanatory diagrams of the operation, and knee 1 is a side view showing the operation of the position regulating mechanism of the tailgating mechanism;
Ho-1 is a partially enlarged view illustrating the operation of the tailgating mechanism. 1; Upper die, 2; Lower die, 4; Ram, 5; Upper die body, 6; Guide groove, 7; One corner block, 8;
First intermediate divided mold, 11; Engagement hole of first intermediate divided mold, 12; Other corner block, 13; Second intermediate divided mold, 16; Moving frame, 17a; Support block body,
18; Model number selection mechanism, 19; Pusher, 20;
Fluid pressure cylinder, 21; Buffer structure, 23; Spring, 24; Pin, 28; Tailgating mechanism, 29; Hook pin, 30; Fluid pressure cylinder, 31; Fluid pressure cylinder, 310; Round hole, 311; Cylinder chamber,
312; Piston rod, 32; Slide mechanism,
33; fluid pressure cylinder; 34; piston rod;
35; Hook pin, 36; Notch, 37; Position regulation mechanism, 38; Position regulation mechanism, 41; Regulation plate, 4
3; Movement support frame, 49; Movement restriction plate, 50; Connection block, 51; Die clamper.

Claims (1)

[Claims] 1. The length of the upper mold is determined by closely fitting the required number of split upper molds among the many split upper molds provided at the lower end of the ram depending on the length of the workpiece, and the upper mold and lower mold are used to form a wing beam or In a bending machine that bends the edge of a workpiece in cooperation with a corner block 7, one corner block 7 is suspended from the lower surface of the ram 4, and a guide groove 6 is provided along the longitudinal direction of the ram to allow lateral movement. A large number of first intermediate split molds 8 are freely suspended, and a moving frame 16 that is forcibly moved laterally is placed on the back of the ram 4, and holes 11 provided on the back of the first intermediate split molds 8 are selected. A forced slide mechanism 32 includes one hook pin 35 that is removably engaged with the other parts and moves the first intermediate divided molds 8 laterally by the lateral movement of the moving frame 16.
and the other corner block 1 is provided in this moving frame 16.
2 and a large number of second intermediate divided molds 13 having a thinner width than the first intermediate divided mold 8 are mounted side by side in close contact, and the other corner block 12 is
The intermediate split molds 8... are configured to be forcibly moved in and out from the rear rear to the front, and the second intermediate split molds 13...
A pusher 19 is provided on the back side of the split mold 13 for controlling the extrusion of the group of divided molds 13 from the rear of the back of the first intermediate divided mold 8 to a position slightly forward of the back surface position in the mold number selection movement process. The pusher 19 is provided with a pusher 19 that elastically absorbs the forward resistance of the divided molds 13 during the number selection movement stroke corresponding to each of the second intermediate divided molds 13.
A buffer structure 21 is provided to allow a forward pushing action of the second intermediate divided molds 13, and the second intermediate divided molds 13 are moved in and out of the back and forth movement locus to select the number of second intermediate divided molds 13 to be selected. A position regulation mechanism 37 including a regulation plate 41 that controls position alignment at the end of the stroke is provided,
In addition, a tailgating mechanism 28 is provided which integrally pushes the selected second intermediate divided die 13 group and the other corner block 12 further forward, and this tailgating mechanism 2
A bending width changing device for a bending machine, characterized in that a positioning mechanism 38 is provided for aligning the second intermediate split molds 8 to the aligned second intermediate split molds 13.