JP2812044B2 - Die changing device for sheet bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die changing apparatus for a plate bending machine, for example, a folding machine, a press brake, etc., which can change a die width in accordance with a bending width of the plate.

[0002]

2. Description of the Related Art In cabinets and the like of electric equipment and various other products, a rectangular plate obtained by bending four sides into a U-shape or a Z-shape is used. In order to bend the plate material in this manner, usually, after bending the short side edge portion of the plate material cut into a predetermined size, the plate material is turned in a plane to bend the long side edge portion. When bending the long side edge, since the rising piece of the short side edge that has been bent already exists, it is necessary to change the width of the upper die to a width that does not interfere with the rising piece.

Conventionally, as a mold changing apparatus for automatically changing the width of the upper die, the upper die is constituted by a number of split dies arranged in the width direction of the die, and these split dies are processed at a machining position and a standby position. There is a device that is rotated by a reversing device between the two.
According to this, by selecting an arbitrary number of split dies and arranging them at the processing positions, the die width can be freely changed.

[0004]

Since each of the divided dies is rotatably supported, the position of the work pressing surface varies among the divided dies due to an assembly error or the like. For this reason, conventionally, when manufacturing a plate material bending machine, the work pressing surface of each of these split dies is flattened in a state where each split die is set at a processing position. Cannot be used, requires manual work, and has a problem of low productivity. In addition, even when a part of the split mold is replaced with a new one due to damage due to use or the like, flat machining of the entire split mold is required again, and there is a problem that maintenance work is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold changing apparatus for a plate bending machine which can secure a plane between each of the divided dies without requiring flat processing after assembly and can easily replace the divided dies during maintenance. It is to provide.

[0006]

According to the present invention, the upper die is composed of a number of split dies arranged in the width direction of the die, and a reversing device for rotating these split dies between the processing position and the standby position is provided. Applied to mold changing equipment. In this type of mold exchanging apparatus, a reference surface for bringing the surface opposite to the workpiece pressing surface of each split die into contact at the processing position is provided on the upper die mounting member, and the split die is provided on the reference surface with a tapered surface of a clamp member. A clamp device is provided for pressing with.

[0007]

According to this structure, each split mold is rotatable, but is pressed against the reference surface of the upper mold mounting member by the clamp device, so that a high surface accuracy of the work pressing surface can be obtained. Therefore, a flat surface between the split dies is secured without requiring flat processing after assembly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 3, a plate bending machine 1 includes an upper die 2 and a lower die 3 sandwiching a plate W up and down, and a bending die 4 for bending a projection W1 of the plate W from the upper and lower dies 2 and 3 upward or downward. And The lower mold 3 is fixed to the main body frame 5. The upper mold 2 is provided with a ram 7 via an upper mold mounting member 6.
And driven up and down together with the ram 7 by the lifting cylinder 8. The bending mold 4 is attached to the tip of a rocker arm 9, and the rocker arm 9 is provided with three cylinder devices 1.
It is connected to 0 to 12 and can move up and down, swing and move in the front and rear direction. The upper die 2 can be freely changed in die width by a die changing device 13 described later.

A plate feeding device (not shown) for moving the plate W into and out of the upper and lower dies 2 and 3 and rotating the plate W in a plane is disposed in front of the plate bending machine 1.

The configuration of the mold changing device 13 will be described. FIG.
As shown in the figure, the upper mold 2 is provided with side molds 14 at both ends in the mold width direction.
A central mold 15, a number of thick-walled split molds 16 provided between them in the mold width direction, a plurality of thin-walled split molds 17 provided adjacent to the central mold 15, Open mold 1
And 8. Thickness of thick split mold 16 (mold direction width)
Is formed, for example, in the range of about 50 mm to 100 mm. In this case, the thickness of the thin-walled split mold 17 is formed so that the total thickness is the same as or twice the width of the thick-walled split mold 17. The opening die 18 is attached to the side die 14 by a parallel link 19, and is movable from a hanging position to a position (a position shown in the drawing) that becomes an extension of the upper die 2 in the die width direction.

The side mold 14 is slidably engaged with a pair of guide rails 20 provided on the lower surface of the upper mold mounting member 6 as shown in FIG. Ball nut 21 supported and provided on head 14a
Are screwed into the side die feed screw 22 and driven forward and backward in the die width direction. As shown in a broken plane in FIG. 2, the side die feed screw 22 is supported by a bearing 23 on the upper die mounting member 6 and is driven forward and reverse by a motor 24. The side-type feed screw 22 is symmetrically moved by screwing with screw portions 22a and 22b in opposite directions. The side-type moving device 25 is constituted by the side-type feed screw 22 and the motor 24.

As shown in FIG. 6, each of the thick-walled split dies 16 has a cylindrical portion 16a rotatably fitted on the outer periphery of a reversing shaft 26, and is engaged with the reversing shaft 26 by an engagement mechanism 27 to be turned over. By the forward / reverse rotation of the shaft 26, the shaft 26 is rotated from the downward processing position shown by the chain line in the same figure to the standby position in the flipped-up state shown by the solid line.

The reversing shaft 26 has a center spline shaft 33.
And a split-type support cylinder 34 which is fitted to the outside so as to be axially movable and is engaged with a ball spline (not shown).
As shown in FIG. 2, the spline shaft 33 is rotatably supported by the upper die mounting member 6 by a bearing 39, and has a pinion 35 at one end.
The rack 36 that meshes with is rotated up and down by the reversing cylinder 37 (FIG. 1), so that the rack 36 is rotated 180 degrees forward and backward. The reversing cylinder 37, the reversing shaft 26, the engaging mechanism 27, and the like constitute a reversing device 38 of the thick-walled split mold 16 and the thin-walled split mold 17.

As shown in FIG. 2, two split mold support cylinders 34 are provided separately on both sides of the center mold 15, and the split mold support cylinder 34 on the right side of FIG. It is fixed integrally with the member 40. The right divided-type support cylinder 34, the central mold 15, and the right slide transmission member 40 constitute a divided-type feed holder 41 that moves the right thick-walled divided dies 16 in the mold width direction while holding the right divided thick-walled divided dies 16. . The split-type support cylinder 34 on the left side of the figure is integrally fixed to the thin-walled split-type holder 42 and the left slide transmission member 43, and moves the left-side thick-walled split die 16 and the thin-walled split die 17 in the die width direction. The split-type feed holder 44 is constructed.
Note that the thin-walled split type holder 42 is provided with a spacer die 59 for filling a gap between the thin-walled split die 17 and the thick-walled split die 16.

The slide transmission members 40, 43 of each of the split-type feed holders 41, 44 are screwed with threaded portions 45a, 45b formed on the holder feed screw 45 in mutually opposite threads with ball nuts 46, 47, respectively. Due to the rotation of the screw 45, they move symmetrically with respect to each other. The holder feed screw 45 is rotatably supported by the upper die mounting member 6 by a bearing 48, and is driven to rotate forward and reverse by a motor 49.

In FIG. 6, an engaging mechanism 27 of the thick-walled split mold 16 has an operating pin 30 inserted into engagement holes 28 and 29 provided in alignment with the cylindrical portion 16a of the thick-walled split mold 16 and the reversing shaft 26. And the engagement pins 31 are respectively fitted so as to be able to protrude and retract,
The engagement pin 31 is urged by the spring member 32 so as to be engaged with both engagement holes 28 and 29 in the natural state as shown in FIG. In this engaged state, the rotation of the reversing shaft 26 can be transmitted to the thick split mold 16. The tip of the operation pin 30 is formed in a spherical shape, and when the engagement pin 31 is engaged, the tip of the operation pin 30 protrudes from the flat portion 16b provided on the cylindrical portion 16a.

The protruding operation pin 30 is brought into contact with the pressing plate 14b attached to the side die 14 when the side die 14 comes to a position in the die width direction corresponding to the thick-walled split die 16 as shown in FIG. As a result, the engagement pin 31 is pushed against the spring member 32 to a position where the engagement pin 31 is disengaged from the engagement hole 28 of the thick split mold 16. Therefore, the engagement pin 31 is disengaged from the cylindrical portion 16a of the thick-walled split mold 16, and in this state, the reversing shaft 26 can freely rotate within the cylindrical portion 16a. The pressing plate 14b of the side mold 14 is brought into contact with the flat portion 16b of the cylindrical portion 16a of the thick-walled split mold 16 in the standby position where the thick-walled split mold 16 is flipped up, in addition to the operation of immersing the operation pin 30. Also serves the function of holding the angle.

Referring to FIG. 6, the positioning means of the thick split mold 16 will be described. When the thick-walled split mold 16 is in the downward machining position, the positioning face 16c that abuts on the reference face 20a formed on the lower surface of the guide rail 20 of the upper mold mounting member 6 is set on the face opposite to the workpiece pressing face 16e. A dovetail-shaped positioning projection 1 which is inserted between the guide rails 20 and 20
6d. One guide rail 20 (the right guide rail in the figure) has a surface that engages with the positioning projection 16 d formed as an upward tapered surface, and the other guide rail 20.
A clamp member 50 is attached to each thick-walled split mold 16 via a guide rod 51 so as to face the positioning projection 16 and move forward and backward.

The distal end surface of the clamp member 50 is formed as an upward tapered surface 50a, and is urged in a non-engaging direction by a return spring 52. One end of the guide rod 51 is the guide rail 20
The protruding portion is pressed by a spring force of a pressing spring 55 by a pressing lever 54 that is rotatable around a support shaft 53. The pressure spring 55 is configured to project and urge the reciprocating rod 56 engaged with the pressing lever 54, and is configured to have a large pressing force in which a number of disc springs are stacked. The reciprocating rod 56 is composed of a piston rod of a releasing cylinder 57, and is retracted by the releasing cylinder 57 against the pressure spring 55. A clamping device 58 is constituted by the pressure spring 55, the release cylinder 57, the pressing lever 54, the clamp member 50, and the like.

In FIG. 8, each of the thin-walled split dies 17 is rotatably mounted on the outer periphery of a cylindrical portion of a thin-walled split-type holder 42 integrally fixed to the split-type support cylinder 34. An engagement mechanism 60 that engages with and disengages from 42 is provided. The engaging device 60 is an engaging device 27 of the thick split mold 16.
The operation piece 61 and the engagement piece 62 have the same configuration as that of FIG. 4, and are respectively fitted into engagement holes formed in alignment with the thin-walled split mold 17 and the thin-walled split holder 42. It is composed of a leaf spring 63 for urging the joint piece 62 to protrude. The engaging piece 62 is engaged between the engaging hole of the thin-walled split mold 17 and the engaging hole of the thin-walled split mold holder 42, and is provided on the pressing plate 15b attached to the central mold 15 as shown in FIG. 61 is pressed and immersed, the thin-walled split mold 17
To the disengaged state.

The thin-walled split mold 17 has a flat portion 17b engaged with the pressing plate 15b, a positioning projection 17d and a positioning surface 17c, like the thick-walled split die 16.
The clamping device 58 can clamp all the thin-walled split molds 17 with one clamp member 50 at the same time.

The operation of the above configuration will be described. 9 and 10
The thick split mold 16 has a width of 50 mm and the thin split mold 17 has
Are shown in the case where five are provided with a width of 10 mm. In these figures, the shapes of the split-type feed holders 41, 43 and the like are schematically shown.

FIG. 9 shows a case where the product width is other than the 50 mm pitch. In the preparatory state shown in FIG. 2A, the side mold 14 is at a position opened to the outer end, and the thick-walled split mold 16 and the thin-walled split mold 17 are jumped up to the standby position. From this preparation state, first, the side dies 14 on both sides are symmetrically moved to a position corresponding to the product width by the side die feed screw 22 (FIG. 2B). Then, the split type feed holders 4 on both sides
The end faces of the thick-walled split mold 16 whose end faces are shifted from the side molds 14 are made to coincide with the side molds 14 by symmetrically moving the base molds 1 and 44 to the center side with the split mold feed screws 45 (FIG. 2C). In this state, a part of the thin-walled split mold 17 is located at a position corresponding to the center mold 15, and the remaining one is the center mold 1.
The position deviates from 5. Some of the thick-walled split molds 16 are located at positions corresponding to the pressing plates 14b of the side molds 14, and the rest are located at positions separated from the side molds 14.

Thereafter, the reversing shaft 26 (FIGS. 2 and 6) is rotated by 180 ° by the reversing cylinder 37 (FIG. 1), thereby separating the thick mold 16 and the central mold 15 from the side mold 14. The thin-walled split mold 17 that has deviated from the position turns 180 ° together with the reversing shaft 26 and descends to the processing position (FIG. 3D).
The thick split mold 16 and the thin split mold 17 at the positions respectively corresponding to the side mold 14 and the center mold 15 have the engagement mechanisms 27 and 60 in the disengaged state, respectively, as described later. Regardless, it is left in the standby position. In this way, the upper die 2 is changed to the target die width.

FIG. 10 shows a case where the products have a pitch of 50 mm. In this case, when the side die 14 is moved to a position corresponding to the product width from the preparation state of FIG. 9A (the same state as FIG. 9A) (FIG. 10B), The end of 14 corresponds to the end of the aggregate of the thick-walled split mold 16 or the thin-walled split mold 17. Therefore, the thick-walled split mold 16 and the thin-walled split mold 17 by directly rotating the reversing shaft 26 do not undergo the position adjusting process of the split-type feed holders 41 and 42 in FIG.
Is rotated to the processing position (FIG. 4C).

Next, the turning operation of the thick-walled split mold 16 will be described with reference to FIG.
It is explained together with. As shown in FIG.
4 at the position corresponding to the pressing plate 14b.
When there is an operation pin 6, the operation pin 30 is pushed by the pressing plate 14b to enter, and the engagement pin 31 is disengaged from the engagement hole 28 of the thick-walled split mold 16. Therefore, as shown in FIG. 2B, the reversing shaft 26 freely rotates within the cylindrical portion 16a of the thick-walled split mold 16. In addition, the thick-walled split mold 16 is configured such that the flat portion 16b abuts against the pressing plate
Even if there is no support by the above, it is held in the state of jumping up to the standby position.

[0027] As shown in FIG.
Is located at a position disengaged from the side mold 14, the engaging pin 31 projects by the bias of the spring member 32 and
6 is engaged with the engagement hole 28. As a result, the thick-walled split mold 16 rotates integrally with the reversing shaft 26 as shown in FIG.
By rotating the reversing shaft 16 from the original position by 180 ° as shown by the chain line, the thick-walled split mold 16 rotates to the processing position.

As described above, by moving the side die 14, the thick-walled split die 16 is rotated from the standby position to the processing position.
Can be selected. Therefore, a dedicated drive mechanism for selecting the thick-walled split mold 16 is not required, and the structure of the mold changing apparatus is simplified. The operation of the engagement mechanism 60 is also performed in the thin-walled split mold 17 in FIG.
The selection of the thin-walled split mold 17 to be rotated to the processing position is performed. In the case of the thin-walled split mold 17, instead of the side mold 14, the engaging mechanism 6 is formed by the pressing plate 15 b of the central mold 15.
A disengagement operation of 0 is performed.

Each of the thick split molds 16 rotated to the processing position is
As shown in FIG. 6, the dovetail-shaped positioning protrusion 16d is pressed from the side by the spring force of the pressure spring 55 by the clamp member 50. At this time, the pressing surface of the clamp member 50 is formed as an upward tapered surface, and the side surface of the guide rail 20 facing the clamp member 50 is also formed as an upward tapered surface. 50, and the shoulder positioning surface 16
c is pressed against the reference surface 20a of the guide rail 20.
For this reason, while each of the thick-walled split dies 16 is rotatable, high surface accuracy can be obtained on the work pressing surface 16e of each of the thick-walled split dies 16. Therefore, a flat surface is secured across the thick-walled split molds 16 and the side molds 14 without the need for flattening after assembling.
When replacing 6, the flat processing is not required, and the maintenance is facilitated.

[0030]

According to the mold exchanging device of the present invention, a reference surface for contacting each split die at a processing position is provided on the upper die mounting member, and the split die is pressed against the reference surface by a clamp device. Although the split molds have a rotatable configuration, high surface accuracy can be obtained on the pressing surfaces of the individual split molds. for that reason,
There is an effect that a flat surface between the split dies can be secured without requiring flat processing after assembly, and the split dies can be easily replaced during maintenance.

[Brief description of the drawings]

FIG. 1A is a front view of a mold changing apparatus according to an embodiment of the present invention, and FIG. 1B is a side view thereof.

FIG. 2 is a cutaway plan view of the mold changing apparatus.

FIG. 3 is a cutaway side view of a plate bending machine using the mold changing device.

FIG. 4 is an enlarged cutaway side view showing an installation portion of a side die and a thick-walled split die in the die changing apparatus.

FIG. 5 is a front view of a clamp device of the mold exchanging device.

FIG. 6 is a cutaway side view showing a relationship between a thick-walled split die of the die changing device and a clamp device.

FIG. 7 is a diagram illustrating the operation of a thick-walled split type engagement mechanism.

FIG. 8 is an enlarged cutaway side view showing the vicinity of a thin-walled split mold of the mold exchanging apparatus.

FIG. 9 is an explanatory diagram of the overall operation.

FIG. 10 is an explanatory diagram of the overall operation.

[Explanation of symbols]

2 ... upper mold, 3 ... lower mold, 4 ... bending mold, 6 ... upper mold mounting member,
14 ... side type, 15 ... center type, 16 ... thick split type, 1
6a: cylindrical portion, 16b: flat portion, 16c: positioning surface, 1
6d: positioning projection, 16e: work pressing surface, 17: thin-walled split type, 18: open type, 20: guide rail, 20a:
Reference surface, 22: side-type feed screw, 26: reversing axis, 27
... engagement mechanism, 31 ... engagement pin, 33 ... spline shaft, 3
4 split support cylinder, 38 reversing device, 50 clamping member, 50a tapered surface, 54 pressing lever, 55 pressure spring, 57 release cylinder, 58 clamping device, W
… Plate material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B21D 37/14 B21D 37/14 C

Claims (1)

(57) [Claims] 1. A reversing device comprising an upper die comprising a plurality of split dies arranged in a width direction of a die, and rotating these split dies between a processing position and a standby position around a rotation center along the width direction of the die. Provided,
A reference surface is provided on the upper die attachment member for bringing the surface opposite to the workpiece pressing surface of each of the split dies into contact at the processing position, and a clamp device for pressing the split die against the reference surface with the tapered surface of the clamp member is provided. Die changing device for sheet bending machine.