JP2521741B2 - Folding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a split mold device in a bending machine, and more specifically, a group of split molds including a plurality of split molds. The present invention relates to a folding machine capable of changing the entire width to a desired width and automatically centering the bending center.

(Prior Art) Conventionally, a panel in which each edge of four sides of a plate material such as a rectangle is bent at a right angle to have a U shape has been used in cabinets, showcases, vending machines, computer units, and the like. .

To manufacture such a panel, a folding machine such as a press brake or a folding machine is used. That is, for example, after bending both short side edges of a work cut in a rectangle in advance at right angles, the work is rotated 90 degrees in a plane and the width of the upper die is adjusted to the inside of the short side bend. A panel product is obtained by bending one long side edge portion at a right angle and further rotating 180 degrees and bending the other long side edge portion at a right angle.

In the above processing, when the long side is bent by, for example, a folding machine, there is a rise due to the bending of the short side that has already been bent. The length should be reduced by the number of sheets. For this reason, it is necessary to prepare split dies having different widths and to replace the upper die of the split dies each time the width of the work changes.

Since it takes a lot of time to replace the split molds and the operator manually performs the work, the NC control, which is one of the automation of the bending machine, is not performed.

From the above viewpoint, there is a strong demand for an automatic exchange device that automatically exchanges split molds.

As a split mold device for a bending machine that meets this demand,
For example, Japanese Utility Model Laid-Open No. 59-44616 is known.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional technique, a desired width is selected from a group of divided molds prepared for the purpose of adjusting a value that is not divisible by the width of one divided mold. When pulling out the split molds, a predetermined number of split molds are picked up by the spline shaft and inverted with reference to one end of the split molds. Therefore, the split molds cannot be symmetrically distributed about the bending center of a reference plane example folding machine. Therefore, the center of the split mold is not always constant and moves depending on the selected number of split molds.Therefore, it is necessary to align the work center, that is, the bending center of the bending machine and the center of the split mold each time. It is both inconvenient and troublesome.

In order to improve the above problems, an object of the present invention is to provide a bending machine capable of easily and automatically centering a width center and a bending center of a group of divided molds including a plurality of divided molds at low cost. To provide.

[Structure of the Invention] (Means for Solving Problems) In order to solve the above-mentioned conventional problems, in the present invention, the bottom die 1 extending in the left-right direction in the frames 7 and 9
7 is provided, a ram 19 is provided above the bottom die 17 so as to be movable in the vertical direction, and a bottom die is provided below the ram 19.
Since the top die 33 that press-fixes the work in cooperation with 17 is provided and the edge of the work pressed and fixed by the bottom die 17 and the top die 33 is bent, the bend beam 41 can be moved in the vertical direction behind the bottom die 17. In the bending machine 1 provided in the above, the top die 33 is composed of a plurality of split dies 55 divided in the left-right direction, a movable frame 63 is provided in the ram 19 so as to be movable in the left-right direction. Is provided with a movable operating device 91 for moving in the left-right direction, the movable frame 63 is provided with a non-rotatable fixed shaft 69 and a rotatable rotating shaft 71 coaxially, and a rotating operating device for rotating the rotating shaft 71 is provided. , A plurality of split molds 55 are respectively fitted to the fixed shaft 69 and the rotary shaft 71 so as to be movable in the left-right direction, and a mold holder 75 for holding the left and right ends of the split molds 55 is formed. Of the movable frame 63 The interlocking mechanism 81,83,85 for moving the die holder 75 by the same amount in the opposite direction in synchronism with the movement is provided, and all the split dies 55 are located on the fixed shaft 69 and all the splits are provided. When one end of the die 55 is located at the boundary between the rotary shaft 71 and the fixed shaft 69, the centers of all the split dies 55 should be aligned with the bending center in the bending process. Is characterized by.

(Operation) In the above configuration, when the bending width (2l) of the work is shorter than the length (width 2L) in the left-right direction of all the split molds 55,
A state in which all the split dies 55 are located on the fixed shaft 69 and one end of all the split dies 55 is located at the boundary between the rotary shaft 71 and the fixed shaft 69 (at this time, all the split dies 55 From the distance L between the other end and the bending center, the moving actuator 91 moves the movable frame 63 rightward (or leftward) with respect to the bending center in bending by a predetermined amount (L-1). Let
As a result, the interlocking mechanisms 81, 83, 85 also work together to move the mold holder 63 and all the split molds 55 leftward (or rightward) by the same predetermined amount (L-1) to move all of them. The distance between the other end of the split mold 55 and the bending center is L- (L-l)
It becomes 1 more. On the other hand, due to the action of the interlocking mechanisms 81, 83, 85, the moving direction of the mold holder 75 is opposite to the moving direction of the movable frame 63, and the moving amount of the mold holder 75 is the same as the moving amount of the movable frame 63. Therefore, the mold holder 75 is a movable frame.
63 to the left (or right) to twice the specified amount (2L-
2l), the distance between one end of all the split molds 55 and the boundary is 2L-2l, and as a result, the distance between the boundary and the bending center is 2L- (2L-2l)- l than l
become. Therefore, it is possible to make the intervals between the other ends and the boundary portions of all the split molds 55 the same as the work bending width 2l, in other words, a plurality of split molds 55 having the same width as the work bending width. It is possible to select, and the center of the plurality of split dies 55 (the selected plurality of split dies 55) from the other end to 2l of all the split dies 55 can be matched with the bending center.

After selecting the plurality of split molds 55, the rotary shaft 71 is rotated by the operation of the rotary actuator, so that the split molds 55 located on the rotary shaft 71 (the split molds other than the selected multiple split molds 55 are separated. Rotate the mold 55) to retract it from the pressing position.

After that, the ram 19 is moved downward, and the edge portion of the work is pressed and fixed by the plurality of split molds 55 having the same width as the bending width and the bottom die 17. Then, the bend beam 41 is appropriately moved in the vertical direction to bend the edge of the work.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

An example applied to a folding machine as a folding machine will be described, but it can also be applied to a press brake, a koki bender, and the like.

First, a bending machine incorporating a split mold device will be described. Referring to FIG. 1 and FIG. 2, the frame 3 constituting the folding machine 1 is supported on the base 5 and the upper portions of the left and right side frames 7 and 9 which are vertically erected from both sides of the base 5. The upper beam member 11 and the like are separated from each other in the front.

Above the base 5, a horizontal plate 13 having left and right ends connected to the side frames 7 and 9 is supported. On the upper surface of the horizontal plate 13, the left and right ends are attached to the side frames.
A die support 15 connected to 7 and 9 is erected. A bottom die 17 having both ends connected to the side frames 7 and 9 is supported on the die support 15. The bottom die 17 is for supporting the work W.

Further, as can be seen from FIGS. 1 and 2,
A ram 19 is arranged above the bottom die 17 so as to be vertically movable. The ram 19 has a front-rear width wider than the space between the bottom dies 17 and extends largely in the left-right direction. Both left and right sides of the ram 19 are pivotally connected to the piston rods 25 of the left and right lifting cylinders 23 mounted on the inner surfaces of the side frames 7 and 9 via brackets 21. Therefore, the ram 19 is moved up and down by the operation of the lifting cylinder 23.

As shown in FIG. 2, a plurality of projecting pillars 27 are provided on the lower surface of the ram 19, and a gradient block 29 is vertically positioned on the surface of the projecting pillar 27 corresponding to the bottom die 17. It is provided freely.

A support frame 31 forming a part of the ram 19 is removably attached with a top die 33 which is placed on the bottom die 17 and press-fixes the workpiece W. The top die 33 is a split die which is divided into a plurality of pieces in the width direction and is used in combination with an appropriate length dimension according to the bending width dimension of the work W by a split die device which will be described later in detail. It is configured.

When the work W is pressed and fixed to the bottom die 17 by the top die 33, a plurality of pressing cylinders 35 for pressing the ram 19 are mounted on the lower surface of the upper beam member 11 at appropriate intervals. Moreover, a plurality of rotary actuators 37 corresponding to the pressing cylinders 35 are provided on the upper surface of the ram 19.
Is attached to the rotary shaft of each rotary actuator 37, and a plurality of L-shaped movable blocks 39 are attached to the rotary shaft of the rotary actuator 37 so as to be movable to a position directly below the pressing cylinder 35 and a position away from directly below the pressing cylinder 35. There is.

With the above configuration, after the work W is detected, only the rotary actuator 37 is operated. Therefore, only the movable block 39 at the position corresponding to the work W is positioned directly below each pressing cylinder 35.

In order to bend the edge portion of the work W pressed and fixed to the bottom die 17 by the top die 33 upward, a bend beam 41 is vertically moved inside the bottom die 17 as shown in FIG. It is provided freely. More specifically, the bend beam 41 is attached to an upper portion of a bending ram 43 provided so as to be vertically movable, and a lower portion of the bending ram 43 is rotatably attached to the horizontal plate 13 via a plurality of brackets 45. It is fitted and supported on the eccentric portion of the eccentric shaft 47 which is supported.

Therefore, the eccentric shaft 47 is rotated and the bend beam 41
By raising the bottom die 17 above the top surface,
The edge of the work W, which is pressed and fixed to the bottom die 17 by the top die 33, is bent upward.

An arm member 49 is integrally attached to the eccentric shaft 47 in order to rotate the eccentric shaft 47.
The piston rod 53 of the bending cylinder 51 is
The tip end of is connected pivotally via a pin. The lower end of the bending cylinder 51 is attached to the base 5.

Therefore, the eccentric shaft 47 is rotated by expanding and contracting the piston rod 53 of the bending cylinder 51. The rotation of the eccentric shaft 47 causes the bend beam 41 to pass through the bending ram 43.
Is raised from the upper surface of the bottom die 17 and the edge of the work W pressed and fixed to the bottom die 17 by the top die 33 is bent upward.

The above-described top die 33 includes a plurality of segment dies 55 divided in the width direction, a hollow die 57 arranged on both sides of a group of the segment dies 55, and both sides of the hollow die 57. It is composed of a plurality of reference molds 59 divided in the width direction. In addition, when the bending width of the work W is short, bending work is performed using a plurality of segment molds 55 as described later. Then, the bending process is performed using the hollow die 57 and the reference die 59.

The plurality of segment molds 55 are mounted on the split mold device 61, and are automatically centered at the bending center.

The support frame 31 of the ram 19 is provided with a substantially U-shaped movable frame 63 that is movable in the left-right direction (left-right direction in FIGS. 3 and 4). A rod 65 extending in the left-right direction in FIG. 3 is inserted between them, and is fixed by bolts 67 from both outer sides of the movable frame 63.

In FIG. 3 of the rod 65, for example, a fixed spline shaft 69 is mounted on the right side, and on the left side, for example, the length and diameter of the fixed spline shaft 69 are substantially the same, and the rotatable rotary spline shaft is coaxial. 71 is mounted via a bearing. Moreover, the fixed spline shaft 69 and the rotating spline shaft 71 are attached to the rod 65 in a state of being in close contact with each other.

The rotating spline shaft 71 of the fixed spline shaft 69,
A plurality of segment molds 55 divided in the width direction are spline-fitted so as to be movable in the left-right direction in FIG. On both sides of the group of segment dies 55, an inverted U-shaped die holder 75 is moved laterally in FIG. 3 via flanges 73 fitted to the fixed spline shaft 69 and the rotating spline shaft 71. It is installed as possible.

A gear 77 is fitted to the left end of the rotary spline shaft 71 in proximity to the inner wall of the left frame of the movable frame 63, and a worm gear 79 is fitted to the gear 77. The worm gear 79 is driven by a rotary actuator (not shown) such as a motor mounted on the support frame 63. Therefore, when the worm gear 79 is driven by a rotary actuator (not shown), the gear
The rotary spline shaft 71 is rotated via 77.

A first rack 81 extending in the left-right direction is integrally attached to a substantially central portion on the lower surface side of the movable frame 63 in FIG. 3, and on the other hand, on the upper surface side of the mold holder 75, the first rack 81 is attached. The second rack 83 extending in the left-right direction and having substantially the same length as the rack 81 is integrally attached. A mold holder 31 is provided between the first rack 81 and the second rack 83.
A rotatable pinion 85 is fixedly disposed in the first rack 81 and the second rack 83. The pinion 85 is meshed with each of the first rack 81 and the second rack 83.

A position detector for detecting a position, for example, an encoder 87 is attached coaxially with the pinion 85. Support frame 63 or mold holder by this encoder 87
The moving distance of 75 is detected, and the moving distance in the width direction of the group of segment molds 55 is obtained by the moving distance.

A bracket 89 is attached to the right side of the upper surface of the movable frame 63 in FIG. 3, for example, and a cylinder device 91 is attached to the bracket 89.

That is, the cylinder 93 of the cylinder device 91 is attached to a part of the support frame 31 through the pin 95, although details thereof are omitted.

The tip of the piston rod 97 of the cylinder 93 is attached to the tip of the bracket 89 by a pin 99.

Therefore, when the cylinder 93 in the cylinder device 91 is operated to move the piston rod 97 to the right in FIG. 3, the movable frame 63 is moved in the same direction via the bracket 89, that is, to the right in FIG. When the movable frame 63 moves to the right, the mold holder 75 is moved to the left via the first rack 81, the pinion 85, and the second rack 83. When the die holder 75 moves leftward, the group of segment dies 55 is moved leftward with respect to the fixed spline shaft 69 via the flange 73. That is, by moving the movable frame 63 to the right,
A group of segment molds 55 are moved to the left, which is the opposite direction to the moving direction of the movable frame 63, via the mold holder 75.

The operation of automatically centering the width center of the group of segment molds 55 in the present embodiment at the bending center will be described.

In FIG. 3, the center of the width 2L of the group of segment molds 55 is set in advance to the bending center CL. In this state, from the right end of the group of segment molds 55 When selecting and using the width of only one group of segment dies 55, the cylinder 93 is operated to move the movable frame 63 to the right, and the movable frame 63 preliminarily calculated by the encoder 85. Only (L-1) is detected and stopped. That is, since the pinion 85 meshes between the first rack 81 and the second rack 83, if the movable frame 63 moves to the right by the movement amount Δl, a group of segment molds 55 is formed.
Is an amount equal to the moving amount Δl to the left, that is, the right end portion A and the left end portion B of the group of segment molds 55 are changed by Δl = (L-1) as shown in FIGS. 3 to 4. Move to positions C and D as shown. Moreover, since the movable frame 63 and the group of segment dies 55 are in a relative relationship, the group of segment dies 55 has moved twice as much as the moving amount of the movable frame 63. Therefore, in FIG. The left end D of the die 55 moves from the original position B to the right (L-
This means that the position E has moved by 2 (L-1) from the position E separated by 1).

In the above relationship, the right end C and the position E when the group of segment molds 55 are moved are bent at the bending center CL.
When the distance from is calculated, it becomes l. That is, from the position E of the group of segment molds 55, the mold width 2 (L-1) in the left part in FIG. 4 is moved by the swivel means to move the rotary spline shaft 71 to the back of the paper surface in FIG. 4, for example. When rotated by 90 degrees, the center of the width 2l of the group of segment molds 55 coincides with the bending center, and the center is automatically centered. Therefore, in order to select a die having a width 2l from the width 2L of the group of segment dies 55 and automatically perform centering, the movable frame 63 may be moved to the right (L-1) in FIG.

Thus, the folding machine 1 shown in FIG. 1 and FIG.
A group of segment molds with a width of 2L to bend the work W with
If you want to use the one that used 55 for the width 2l of the group of segment molds 55 to bend the work W of different width, just move the movable frame 63 (L-1) as described above. Since it only needs to be moved, the operation is easy and the group of segment dies can be centered automatically. Moreover, since the split mold device has a simple structure, it can be manufactured easily and at low cost. Further, the split mold apparatus can accurately select a desired arbitrary small width from a group of split molds and perform automatic centering.

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

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, the movable frame is moved in the left-right direction by the predetermined amount corresponding to the bending width of the work by the operation of the movement operation device. With this simple operation, combined with the action of the interlocking mechanism, it is possible to select multiple split dies with the same width as the bending width of the work, and the center of the multiple split dies selected can be folded during bending. Can be aligned with the bending center.

In addition, after selecting a plurality of split molds, by rotating the rotary shaft by a rotary actuator with a simple configuration, the split molds other than the selected multiple split molds can be retracted from the pressing position. You can

[Brief description of drawings]

FIG. 1 is a front view of a bending machine of an embodiment equipped with the split mold device of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is an enlarged view of a portion indicated by an arrow III in FIG. 1 and shows a split mold device which is a main part of this embodiment. Fourth
The figure shows the operation diagram of FIG. [Explanation of the symbols indicating the main parts of the drawing] 1 ... Bending machine, 33 ... Top die 55 ... Segment mold, 61 ... Split mold device 63 ... Movable frame, 69 ... Fixed spline shaft 71 …… Rotary spline shaft, 75 …… Mold holder

Claims (1)

(57) [Claims] 1. A frame is provided with a bottom die extending in the left-right direction, a ram is provided above the bottom die so as to be movable in the vertical direction, and a top for pressing and fixing a work under the ram in cooperation with the bottom die. Since a die is provided and the edge of the work pressed and fixed by the bottom die and the top die is bent, a bend beam is provided in the rear of the bottom die so as to be movable in the vertical direction, and the top die is divided in the left and right directions. In the bending machine configured by, a movable frame is provided on the ram so as to be movable in the left and right directions,
A movable operating device for moving the movable frame in the left-right direction is provided, a fixed shaft that cannot rotate and a rotatable rotating shaft are coaxially provided on the movable frame, and a rotary operating device that rotates the rotating shaft is provided. The divided dies are fitted to each other so as to be movable in the left and right directions with respect to the fixed shaft and the rotary shaft, and a die holder for holding the left and right ends of the plurality of divided dies is provided to move the movable frame. An interlocking mechanism that moves this mold holder in the opposite direction by the same amount in conjunction with is provided, all split molds are located on the fixed shaft, and one end of all split molds has the rotary shaft. The bending machine is characterized in that the center of all of the split molds is aligned with the bending center in the bending process when it is located at the boundary between the fixed shaft and the fixed shaft.