JPH0421607Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) This invention relates to an R-bending mold used in a bending machine, such as a press brake.

(Prior Art) Conventionally, an R-bending die has been used to R-bend a plate material using a bending machine such as a press brake. Currently, the R-bending mold is generally designed to be able to perform only bending with a certain R dimension.

(Problem to be solved by the invention) By the way, when bending with several types of R dimensions, as many molds as the number of types of R dimensions are required, the cost of the molds increases, and mold management becomes difficult. It was extremely difficult.

Therefore, a punch holder is provided at the bottom of the ram in the press brake so that it can move vertically and freely rotate around a horizontal axis, and the punch holder is equipped with a plurality of upper dies, and the appropriate upper dies are selected. A configuration for use has been developed.

However, in the above configuration, the upper mold is selected by lowering and rotating the punch holder relative to the ram, and after selecting the upper mold, fluid pressure equipment is used in the configuration to fix the punch holder to the ram. However, there is a problem that the configuration becomes large-scale.

[Structure of the invention] (Means for solving the problems) In view of the conventional problems as described above, the present invention provides a punch holder that is approximately perpendicular to the pivots provided on both sides of the punch holder extending in the left-right direction. Buckles that can be rotated up and down in the state and in the hanging state are respectively provided, and each support bar is suspended via an elastic member from a shaft provided at an appropriate position of each buckle, and a plurality of R bends with different radii of curvature are provided. A punch is rotatably supported at both ends thereof, and when each buckle is rotated from a hanging state to an upright state, the punch is raised and comes into contact with the lower surface of the punch holder. The shaft is fixed, and the shaft is located inside beyond the dead center from the vertically upper position of the pivot shaft.

(Example) Hereinafter, an example of this invention will be described in detail based on the drawings.

Referring to FIG. 1, a lower frame 3 of a press brake 1 as a bending machine, for example, has a die 5 as a lower die extending in the left-right direction.
is provided. Side frames 7 and 9 are erected on both sides of the lower frame 3, and an upper frame 11 connects the upper ends of the side frames 7 and 9.
Left and right fluid pressure cylinders 13 and 15 are provided facing downward.

A ram 21 connected to the piston rods 17, 19 of the left and right hydraulic cylinders 13, 15 is guided by the side frames 7, 9 and is movable up and down.

A punch holder 25 as an upper mold holder is mounted on the lower surface of the ram 21 via a plurality of support plates 23.
is installed. A punch 27 for R bending as an upper mold extending in the left-right direction is attached to the lower surface of the punch holder 25 by attachment devices 29 provided at both ends of the punch holder 25.

With the above configuration, by operating the fluid pressure cylinders 13 and 15, the punch 27 for R bending is moved in cooperation with the die 5 to the workpiece placed on the die 5 by the vertical movement of the ram 21. A predetermined R bending process will be performed.

A punch 27 for R bending is attached to the lower surface of the punch holder 25 by the attachment devices 29 provided at both ends of the punch holder 25.

Note that the left and right mounting devices 29 are provided symmetrically and have substantially the same structure, so only the left mounting device 29 will be described, and the description of the right mounting device 29 will be omitted.

More specifically, as shown in FIGS. 2, 3, 4, and 5, the punch holder 2
A mounting plate 31 is integrally attached to the left end portion of 5. A lower part 33L of a buckle 33 is rotatably supported at the lower part of the mounting plate 31 via a shaft 35.

A shaft 3 is located approximately at the center portion 33M of the buckle 33.
7 is attached extending in the left-right direction in FIG. The buckle 33 is pivotable up and down about the shaft 35 between an upright state and a hanging state, and when it is turned to the upright state, the shaft 37 is connected to the shaft 35. It is located above the dead center in the vertically upper position and inside (on the right side in FIG. 2). Support bars 39, 39 are supported at both ends of the shaft 37 so as to be movable up and down, and a support member 41 is fixed to the lower ends of the support bars 39, 39 by, for example, welding.

On the other hand, the other support bars 43, 43 extend downward, and support members 45, 45 are fixed to the upper ends of the support bars 43, 43 by, for example, welding. The support bars 43, 43 and the other support bar 45, 45 are mutually connected to the support members 41, 4.
5 and supporting members 41 and 45
Springs 47, 47 as ammunition are interposed between the two. A shaft 49 is attached to the lower part of the support bars 43, 43.

Furthermore, a hook pin 51 is attached to the left end of the punch 27 for R bending, approximately at the center thereof. The hook pin 51 is hung on the shaft 49.

As shown in FIGS. 3 and 5, the cross-sectional shape of the punch 27 is almost an equilateral triangle, and the cutting edge at each vertex has a curvature surface Rx, which has a different radius of curvature. It is made up of Ry and Rz. Furthermore, grooves 53 are provided at approximately the same depth at approximately the center of each surface connecting the cutting edge portions of each apex.

The punch holder 25 is fitted into the lower surface of the punch holder 25 through the groove 53, and is removably mounted by the mounting device 29 described above.

The state shown in FIGS. 2 and 3 is the punch 2
7 shows a state in which the punch 27 is attached and fixed to the punch holder 25 by the attachment device 29, and the state shown in FIGS. 4 and 5 shows the state in which the punch 27 is removed from the punch holder 25. That is, the second
From the installation state shown in the figure and Fig. 3, the fourth
To operate in the disengaged condition shown in FIGS. and 5, the buckle 33 shown in FIG.
The upper part of the handle 33U is rotated 180 degrees counterclockwise as shown by the arrow using a jig, for example. As a result, the buckle 33 is in a state as shown in FIGS. 4 and 5 with the shaft 35 as a fulcrum, and the groove 53 of the punch 27 descends from the punch holder 27 to the support bar 3.
9 and 43, and is supported by the hook pin 51 and becomes rotatable.

Therefore, if the punch 27 is rotated 120 degrees clockwise as shown by the arrow in the state shown in Fig. 5, it will be rotated 120 degrees counterclockwise from the tip Rx at the apex to the tip Rz. For example, it is possible to change and select the cutting edge portion Rx at the apex to the cutting edge portion Ry with a single touch. Also, from the state shown in Figs. 4 and 5 to Fig. 2,
The state shown in FIG. 3 can be returned to the state shown in FIG. 3 by lifting the handle 33U of the buckle 33. Incidentally, even if the punch holder 25 is attached to the punch 27 in a rough manner by fitting the groove 53 of the punch 27 together, the spring 47 will adjust and fix the punch 27.

In this way, in this example, the cross-sectional shape is almost an equilateral triangle, and the cutting edge portion at each vertex has curvature surfaces Rx, Ry and
Rz, and furthermore, the punch 27 can be changed with a single touch in the removed state. Therefore, the number of punches 27 required is 1/1 compared to the conventional one.
3, mold management will require only 1/3 of the effort, and setup time will also be significantly shortened.

Note that this invention is not limited to the embodiments described above, and can be implemented in other forms by making appropriate changes.

[Effects of the invention] As can be understood from the description of the embodiments above, the present invention has a structure in which the punch holder 25 extends in the left-right direction and is suspended in an upright state from the pivot shafts 35 provided on both sides of the punch holder 25. A plurality of buckles 33 having different radii of curvature are provided on each support bar 43 which is vertically attached to a shaft 37 provided at an appropriate position of each buckle 33 via an elastic member 47. Cutting edge for R bending Rx, Ry, Rz
Both ends of a punch 27 are rotatably supported, and when each buckle 33 is rotated from a hanging state to an upright state, the punch 27 is raised and abuts against the lower surface of the punch holder 25. The shaft 37 is fixed, and the shaft 37 is located inside the vertically upper position of the pivot shaft 35 beyond the dead center.

As is clear from the above configuration, in the present invention, the buckles 33 provided on both sides of the punch holder 25 so as to be rotatable up and down via the pivot shafts 35 can be displaced between an almost vertical upright state and a hanging state. The cutting edge part Rx, Ry, Rz is flexible and can be used for multiple R bends.
Both ends of the punch 27 equipped with the buckle 3
It is rotatably supported by a support bar 43 which is vertically disposed via an elastic member 47 on a shaft 37 provided at an appropriate position in FIG. And the buckle 33
When rotated from a hanging state to an upright state,
The punch 27 is raised and fixed in contact with the lower surface of the punch holder 25, and the shaft 37 is located inside the vertically upper position of the pivot shaft 35 beyond the dead center.

Therefore, according to the present invention, it is possible to perform R-bending with different radii of curvature with one punch 27, and when the punch 27 is fixed to the punch holder 25, the shaft 37 is at the dead center. By exceeding the above range, the above-mentioned fixation is always maintained and there is no possibility of inadvertent release, thereby improving safety.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a press brake equipped with an R-bending die of this invention. FIG. 2 is an enlarged view of the section shown by the arrow in FIG. 1, and FIG. 3 is a side view of FIG. 2. 4 and 5 are diagrams showing the operating states of FIGS. 2 and 3, respectively. Explanation of the symbols representing the main parts of the drawing, 1...
Press brake, 25...Punch holder, 27...
... Punch, 29 ... Mounting device, 33 ... Buckle, 51 ... Hook pin, 53 ... Groove, Rx,
Ry, Rz...curvature surface of the cutting edge.

Claims (1)

[Scope of utility model registration request] Buckles 33 are provided on pivot shafts 35 provided on both sides of the punch holder 25 extending in the left-right direction, respectively, and are rotatable up and down between a substantially vertical upright state and a hanging state. Both ends of a punch 27 are rotatably provided with a plurality of R-bending cutting edge parts Rx, Ry, and Rz having different radii of curvature on each support bar 43 that is vertically provided on a provided shaft 37 via an elastic member 47. When each buckle 33 is rotated from a hanging state to an upright state, the punch 27 is raised and the punch holder 25
An R-bending mold characterized in that the shaft 37 is positioned inward from the vertically upper position of the pivot shaft 35 beyond the dead center.