JPH03142018A - Bending die for press brake - Google Patents

Abstract

PURPOSE:To make various working with different bend radii possible with one machine by mounting plural movable upper dies so as to be freely rotated/ moved vertically and bearing at least one of plural working grooves of a lower die in the rear end part of an assembled body so as to be freely reversibly rotated. CONSTITUTION:The working grooves 4, 5, 6 are provided on a base plate 2 which is movable right and left and a working groove 7 which is reversible to the rear side is freely rotatably mounted with a shaft 8. On a ram 12 which is vertically reciprocated, an upper die 40 is mounted through a bracket 13, an upper die 15 is mounted through a link 17 and upper dies 30, 31 are mounted through a bracket 32. The upper dies are switched and simultaneously sliding the lower dies by operating air cylinders 25, 42, etc., and various bending with different bend radii are automatically done by numerical control with the upper die 40 and lower die 4, the upper die 30 and lower die 5, the upper die 31 and lower die 6 and the upper die 15 and lower die 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a press pull-main bending die for bending a workpiece into a V-shape. The mold is mounted so that it can be moved up and down or reversed, and a plurality of lower mold assemblies corresponding to each of the upper molds are arranged below the upper mold, so that several kinds of bending angles can be easily changed.
This invention relates to a bending die that can perform several types of bending processes with different bending radii using a stand-based bending machine.

[Prior art and its problems] The main body of a kitchen sink or washroom is made by bending the edges and inner surface of a pressed stainless steel plate, etc. using a bending machine.
One-piece panels that are bent at various angles, such as letter-shaped and figure-9 shapes, are often used.

By the way, in order to fold a single piece of work with different bending angles as mentioned above, there is a problem in that several bending machines must be used because the bending machine usually has a single bending type. be.

[Means for Solving the Problems] The present invention solves the above problems and enables a single bending machine to bend a workpiece to several different bending angles. A composite upper mold in which a plurality of movable upper molds are attached to the front and rear of a central upper mold that can be rotated and raised and lowered;
It consists of a lower mold assembly having a plurality of grooves arranged below the upper mold, and a plurality of movable upper molds attached to the rear of the central upper mold are rotatably attached to a shaft supported on the rear surface of the ram. A folding mold for a press brake, comprising a first movable upper mold fixed to a shaft, and a second movable upper mold fixed to a shaft, and each of the upper molds has a selection means for reversing and rotating each of the upper molds separately or simultaneously. In this method, at least one of the plurality of working grooves of the lower die assembly is arranged on a rotating member pivotally supported at the rear end of the lower die assembly so as to be able to rotate in reverse.

[Examples] Hereinafter, the present invention will be specifically described based on illustrated examples.

FIG. 1 is a partially sectional side view of the first embodiment of the present invention, in which a bed 1 is movable in the left-right direction in FIG. A base plate 2 is placed on which a lower die assembly 3 is placed.
is provided.

This lower die assembly 3 is used in correspondence with a central upper die fixed to a ram and a movable upper die, which will be described later, and is provided with three machining grooves 4,5,6 on the front side. A processing groove 7 is provided on the rear side and is rotatable in reverse. A rotating member 9 is rotatably attached to the base plate 2 via a shaft 8, and the working groove 7 is formed on the upper surface of the rotating member with a bolt 10. The lI material 11 is fixed.

On the other hand, above the bed 1, a ram 12 is provided which reciprocates in the vertical direction toward the lower morning structure 3. A straight sword-shaped central upper die 40 is attached to the ram 12 via a bracket 13, and a movable upper die 15 that is moved up and down by a four-bar link mechanism 14 and a drive mechanism is attached to the front surface of the ram 12. . That is, a bracket 16 is attached to the front surface of the ram 12, and it is made up of a first link 17, a second rotation link 18, a third link 19, and shafts 20, 21, 22, and 23 that are rotation pairs of each link. A four-bar link 14 is attached.

The first link 17 has a shaft 20 supported on the bracket 16.
The piston rod 2 of the first cylinder 25 is supported by a pin 24 provided outside the line connecting the shafts 20 and 21.
It is connected to the tip of 6. The second link 18 has an extension 18a to which the movable upper mold 15 is secured using bolts 21,28. The third link 19 is interposed between the shaft 23 supported by the bracket 16 and the shaft 22 of the second link 18, and has a length on the shaft 23 side to absorb minute movement when the link rotates. A hole 29 is formed.

On the other hand, on the rear surface of the ram 12, first and second
Reversing and rotating upper molds 30 and 31 are attached.

That is, a bearing 3 is installed at the rear of the ram 12 as shown in FIG.
A shaft 33 is pivotally supported in the longitudinal direction of the ram via 2.32, and this shaft 33 has a plurality of arms 34 for attaching the first reversible movable upper mold and arms for attaching the second movable upper mold. 35 is installed.

First, the first reversible upper mold mounting arm 34 is rotatably attached to the shaft 33 as shown in FIG. 3, and a movable upper mold mounting bracket 36 is attached to the ram side of this arm 34. However, on the other side there is a bracket 37 for mounting the drive device.
are integrally formed. A mounting member 38 is attached to the movable upper mold mounting bracket 36 by tightening bolts 39 and 39, and at the lower end of this mounting member 38, a first inverted movable upper mold 30 is attached to the central upper mold attached to the ram. It is installed so that it is located directly below 40.

Also, a bracket 37 for mounting the drive device of the arm 34
A piston rod 43 of a second cylinder 42, which is pivotally supported by a pin 41 on the ram 12, is attached using a pin 44 (FIG. 4). Further, on the lower surface of the arm 34 for attaching the first reversible movable upper mold, there is a receiving member 4 having a groove 45 that engages with a key member attached to the second reversible upper mold, which will be described later.
6 are integrally formed.

Next, the second reversible upper mold mounting arm 35 will be explained. This arm 35 is fixed to the shaft 33 and is attached to the pin 4.
7 to prevent rotation. and,
As shown in FIG. 1, an upper mold mounting member 50.51 is fixed in front of the bracket 48 portion with bolts 49, 49, and a second reversible upper mold 31 is disposed at the lower end of the mounting member 51.

Further, on the rear side of the bracket 48, as shown in FIGS. 3 and 5, a prismatic key member 52 is installed laterally with a bolt 53
．． 53 is fixed with a stopper, and when the shaft 33 is shifted in the axial direction, the tip of the key member 52 is configured to engage with W445 provided on the lower surface of the first reversible upper mold mounting arm 34. .

Next, a driving device for shifting and rotating the shaft 33 in the axial direction will be explained.

First, the drive device for shifting the shaft 33 in the axial direction includes a third cylinder 54 disposed at the end of the shaft 33 as shown in FIG.
3 ends and shift the shaft 33 left and right.

Further, the drive device for rotating the shaft 33 is
3 and the fourth pinion 56 attached to the ram 12.
Rack 59 at the tip of piston rod 58 of cylinder 57
The shaft 33 is rotated by engaging the cylinder 57 and rotating the shaft 33 (Fig. 2).

[Function] Next, the function of the bending die of the present invention will be explained using an example in which a drawn panel W as shown in FIG. 6A is bent as shown in FIG. 6B. The order of bending the panels is as follows: A, B, CSD, E in Figure 6B, each bending radius is 1R, 7R, 1R, 20R.
, 12R, with a separately installed NC control device,
Control activated.

First, the upper die of the bending machine is in the state shown in Figure 1.
The bending radius of the lower mold is changed to IR as shown in FIG. That is, when the cylinder 54 at the end of the shaft 33 is operated to shift the shaft 33 in the axial direction from the state shown in FIG. The mold attaching arm 35 slides in the axial direction together with the shaft 33, and the key member 52 attached to the arm 35 engages with the groove 45 of the receiving portion 46 of the first reversible upper mold attaching arm 34. do.

Next, when the cylinder 42 attached to the bracket 37 of the first reversible upper mold mounting arm 34 is operated, the first
The inverting movable upper die mounting arm 34 and the second inverting movable upper die attaching arm 35 are invertedly rotated to the rear of the ram 33 via the shaft 33, and at the same time, the first inverting movable upper die 30 and the second inverting movable upper die attaching arm 35 are rotated backwards through the shaft 33. The movable upper mold 31 moves to the position shown in FIG.
A center upper mold 40 fixed to the ram 12 is set. Next, the base plate 2 on which the lower die assembly 3 is placed is moved to move the processing groove 4 directly below the central upper die 40. Note that it is of course possible to change the upper and lower molds simultaneously using a control m+ device.

Now, as shown in FIG. 7, when the panel W shown in FIG. 6A is inverted into a bending machine set for a bending radius of 1R, the edge of the short side is inserted, and the ram 12 is lowered, Ram 12
The panel W is bent to a bending radius of 1R by the central upper die 40 attached to the center upper die 40 and the working groove 4 of the lower die assembly 3.

Next, the inner side of the bent portion is bent to a bending radius of 7R. That is, by operating the cylinder 54 attached to the shaft 33wa section from the state shown in FIG. 7 by the control device,
Slide the shaft 33 to the right in FIG.
1. Disengage the key member 52 of the second reversible movable upper mold 35 that was engaged with the groove 45 of the arm 34 for attaching the reversible upper mold,
The first reversible upper mold mounting arm 34 is made rotatable with respect to the shaft 33. Then, by operating the cylinder 42 attached to the ram 12, the first reversible upper mold mounting arm 34 is rotated downward using the shaft 33 as a rotating wheel, and the first reversible upper mold 30 is rotated as shown in FIG. Set it so that it is located directly below the center upper mold 40. In addition, in this state, the second inverted upper mold 31 is attached to the mounting 7-
The pinion 5 is fixed to the shaft 33 with a pin 47, and the shaft 33 is connected to a pinion 5 attached to the shaft.
6 and the rack 59 fixed to the piston head of the cylinder attached to the ram 12 are engaged, so that the shaft 33
does not rotate, and the second inverted upper die 31 is held in a position behind the ram 12. Next, the base plate 2 on which the lower mold assembly 3 is mounted is moved to move the processing groove 5 directly below the first reversible upper mold 34, and the bending radius 7 is moved.
Set for R.

Then, the panel W with the bent edges is inserted into the folding machine with the upper die and the lower die set in the above positions, and the predetermined position is placed on the working groove 5, and the ram 12 is lowered to form the folding machine. 1. In a processing action y15 in which the movable upper die 30 is brought into contact with the panel W, the panel W is bent to a bending radius of 7R.

The panel W whose short sides are bent into 1R and 7R as described above is then bent into long sides C and D shown in FIG. 6B.
It is folded in the order of E. In other words, the edges of the longer sides are bent to a bending radius of 1R, and the upper mold in the state shown in FIG.
, the first reversible movable upper mold mounting arm 34 is rotated upward, the first reversible movable upper mold 30 is stored behind the ram 12 as shown in FIG. A central upper die 40 for bending is set. Next, the base plate 2 on which the lower die assembly 3 is placed is moved to move the processing groove 4 directly below the central upper die 40. In the folding machine set for 1R bending as described above, rotate the panel W with the short side bent, insert the long side, and align the predetermined bending position with the working groove of the lower die. 4, the ram is lowered, the center upper die 40 is brought into contact with the panel, and the panel is bent to a bending radius of 1R.

Next, the inner side of the long side portion bent 1R is bent to a radius of 2OR. That is, when the first cylinder 25 attached to the front of the ram 12 is operated from the state shown in FIG. 8, the piston rod 26 of the cylinder 25 is extended.
The first link 17 rotates counterclockwise, pushes down the link mechanism 14, brings the lifting mold 15 attached to the extension of the second link 18 into close contact with the inside of the center upper mold 40, and As shown in the figure, an upper mold with a bending radius of 20R is set. - In the Rokuhei type, the base plate 2 is slid on the bed 2, and the rotating member 9 attached to the rear end of the base plate via the shaft 8 and the groove member 11 fixed thereto are erected, and the working groove 7 is As shown in FIG. 9, it is located directly below the lifting die 15. In this state, when the panel W is placed on the processing groove 6 and the ram 12 is lowered, the panel W is bent to a bend radius of 20R.

Furthermore, the panel W is finally bent with a bending radius of 12R at the E portion. That is, from the state shown in FIG.
When the first cylinder 25 attached to the front of the link mechanism 14 is operated and the piston rod 26 is contracted, the first link 17 rotates clockwise, and the movable upper die 15 attached to the lower end of the link mechanism 14 moves. , the close contact with the center upper mold 40 is released,
The link mechanism 14 is rotated and stored in front of the ram 12 as shown in FIG.

Next, the third cylinder 54 attached to one end of the shaft 37 is operated to shift the shaft 33, and the second reversible movable upper mold mounting arm 35 is inserted into the groove 45 of the first reversible movable upper mold mounting arm 34. The key member 52 attached to the is engaged. A cylinder 42 and a shaft 33 for driving the first reversible upper mold mounting arm 34 disposed on the ram 12
The rotation cylinders 54 are operated simultaneously to rotate the first reversible movable upper mold mounting arm 34 and the second reversible movable upper mold mounting arm 35 downward, thereby causing the first and second reversible upper molds 30. 31 is attached to the lower end of the ram 12 at the same time to the center upper mold 40. ! Fixation of Kango window (Fig. 1). In this state, the panel W is reversed, placed at a predetermined position on the processing groove 6 of the lower mold, and the ram 12 is lowered, the panel W is bent with a bending radius of 1
By bending it to 2R, a finished product as shown in FIG. 6B can be obtained.

In addition, in explaining the above operation, the operation of the upper mold and lower mold was explained separately for each gap, but in reality,
This is automatically and continuously performed under NC control according to a predetermined program.

[Effects of the Invention] Since the present invention has the above configuration, it is possible to perform various bending processes with different bending radii using one bending machine.

In addition, at least one of the plurality of machining grooves included in the lower die assembly is arranged on the upper surface of a rotating member that is rotatably supported at the rear end of the lower die assembly, so that when not in use, It is possible to keep it upside down, expanding the working range, and preventing interference with the workpiece during bending using other processing grooves.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a diagram showing the shaft attached to the rear side of the ram, and the arrangement of the first and second reversible upper mold mounting arms, and FIG. 3 is the same decomposition r4
4, FIG. 4 is a side sectional view of the first reversible movable mounting arm,
Figure 5 is a front view showing the key member and groove in a resting state, Figure 6A
6B is a side view showing the panel, and FIGS. 7 to 9 are partially omitted side sectional views showing the operating state. DESCRIPTION OF SYMBOLS 1... Bed, 2... Base plate, 3... Lower die assembly, 4.5.6.7... Processing groove, 8.33
... Shirt 1-19 ... Rotating member, 10.27.2
B, 39.49.53...Bolt, 11...Groove member, 12...Ram, 13.16.48...Bracket, 14...4-bar link mechanism, 15...Elevating movable Upper type, 17.18.19... Link, 20.21.22.
23...axis, 24.41.44...bin, 25.4
2.54.57...Cylinder, 26.43.55.5
8... Piston rod, 29... Long hole, 30...
First reversible movable upper mold, 31...Second reversible movable upper mold, 32
... Bearing, 34... First reversible movable upper mold mounting arm, 35... Second reversible movable upper mold mounting arm, 36...
- Movable upper mold mounting bracket, 37... Drive device mounting bracket, 38.50.51... Mounting member, 40
...Center upper mold, 45...Groove, 46...Receiving member, 47...Stopping pin, 52...Key member, 56...Pinion, 59...Rack.

Claims (1)

[Claims] 1. A composite upper mold in which multiple movable upper molds are attached to the front and rear of the central upper mold fixed to the ram so that they can rotate and move up and down, and a lower mold that has a plurality of processing grooves arranged below the upper mold. The plurality of movable upper molds attached to the rear of the central upper mold include a first movable upper mold rotatably attached to a shaft supported on the rear surface of the ram, and a second movable upper mold fixed to the shaft. A folding mold for a press brake, comprising a movable upper mold, and each of the upper molds has a selection means for reversing and rotating separately or simultaneously. At least one folding mold for a press brake is disposed on the upper surface of a rotating member that is rotatably supported at the rear end of the lower mold assembly.