JPH05305341A - Radius bending die - Google Patents

Abstract

PURPOSE:To provide a radius-bending die which can change punch tips having different radial shapes and different lengths to a die holder without using a tool through one action. CONSTITUTION:A punch tip holding part 25 to hold an arbitrary radius shaped punch tip 21 is installed at least on one of the tips of the die holder 19, a suitable number of drawing and energizing devices 23 to energize the punch tip 21 in the direction drawing the punch tip 21 to this punch tip holding part 25 are installed on the punch tip 21 and a suitable number of installing spaces 27 freely attachably and detachably to set and contain this drawing and energizing device 23 are provided on the die holder 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an R-bending die which is used in a plate bending machine and which bends a work.

[0002]

2. Description of the Related Art Conventionally, there are various known methods for holding an R-bending punch chip using a round bar in a mold holder.

First, there was a device for holding a punch chip from within a die holder by clamping the holder.

Secondly, there is a device for pulling and holding the punch tip from both sides of the die holder by pulling springs.

[0005]

By the way, in the above-mentioned first conventional apparatus, when the R bending dimension is changed,
Even if the R-shaped punch tip is to be replaced, it is necessary to remove the die holder from the plate bending machine one by one, and the bolts can be removed with a wrench, or the punch tip can be removed from the die holder for replacement. There was a problem that the work efficiency was poor because of the number of man hours required.

Further, in the second apparatus, the tension springs can be arranged only on both sides of the die holder, so that the force for holding the punch tip is weak. Therefore, a thick punch tip or a long punch tip cannot be held in the die holder. Therefore, there is a problem that it becomes impossible to perform bending with a large curvature R or bending with a long bending length.

The object of the present invention is to solve the above problems.
It is an object of the present invention to provide an R-bending die that requires only a few steps to replace the punch tip held in the die holder and can be replaced with one touch.

[0008]

In order to achieve the above object, the R-bending die of the present invention has a punch tip holding portion for holding an arbitrary R-shaped punch tip at least at one end of a die holder. The punch chip holding portion is provided with an appropriate number of attracting and biasing devices for biasing the punch chip in the pulling direction, and the attracting and biasing device is detachably attached and stored. It is characterized in that a suitable number of mounting spaces are provided in the mold holder.

[0009]

In the above structure, in order to mount the attracting biasing device having the R-shaped punch tip mounted on the mold holder, first, the lower end of the attracting biasing device is attached to the lower end of the mounting space from the side of the mold holder. While hooking, the upper side surface of the punch chip is also hooked to the side surface of the punch chip holding part. Then, while pushing the upper part of the attracting and urging device toward the center of the mounting space and pulling the punch chip downward and pushing it toward the side of the punch chip hold part, the punching force is resisted against the urging force of the attracting and urging device. The chip is pushed into the center of the punch chip hold section. After that, when the upper part of the attracting and urging device is pushed into the mounting space, the punch chip is held by the punch chip holding portion by the urging force of the attracting and urging device. In addition, the punch chip is removed from the die holder by performing the reverse operation described above.

In this way, when exchanging the R-shaped punch tip from the die holder, the exchanging is performed with one touch without using a tool such as a wrench.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, in FIG. 9, R as the upper die
For example, a press brake 3 as a plate material bending machine in which the bending die 1 is used is known, but will be briefly described.

The press brake 3 has, for example, C-shaped side frames 7 on both sides of the lower frame 5. An upper apron 9 and a lower apron 11 are provided on the front side of the side frame 7. An R-bending die 1 as an upper die is attached to the lower portion of the upper apron 9 via an intermediate plate 13. On the other hand, the lower apron 11 above
A lower die 17 is attached to the upper part of the via a lower die holder 15.

As is well known, in the press brake 3 having the above-mentioned structure, one of the upper and lower aprons 9 and 11 is moved up and down, and the R-bending die 1 as the upper die and the lower die 17 cooperate with each other. By operating it, the R bending process is performed on the plate material interposed between the R bending mold 1 and the lower mold 17.

Next, the details of the R-bending die 1 as the upper die will be described with reference to FIGS. 1, 2 and 3.
The R-bending die 1 is roughly divided into a die holder 19, a punch tip 21, and an attracting and biasing device 23 for attracting and biasing the punch tip 21 to the die holder 19.

As for the details of the die holder 19, as shown in FIG. 1, a punch tip holding portion 25 having a V-shaped cross section is provided vertically extending in the left-right direction. In FIG. 1, the lower part is a punch chip holding part 25A for the large R punch chip 21A, and the upper part is a punch chip hold 25B for the small R punch chip 21B. Further, in this embodiment, the die holder 19 has a Z-shaped cross section in the front-rear direction. In this way, the Z-shaped cross section is used for positioning when holding either one of the punch tip holding parts 25A and 25B with the upper part sandwiched and held by the intermediate plate 13 when used while facing downward. This is to facilitate. Further, the mold holder 19 is provided with a vertically elongated elliptical mounting space 27 for accommodating the attracting and biasing device 23 in the vicinity of the punch tip holding portions 25A and 25B, which penetrates vertically. ..

A vertical groove 29 is provided between the mounting space 27 and the punch tip holding portions 25A and 25B so that a stripper bolt 33 and a special collar 43, which will be described later, can pass therethrough. As shown in FIG. 1, the vertical groove 29 is provided in the mounting direction of the attracting and urging device 23 in the mold holder 19, but does not penetrate to the rear side.

Details of the attracting and urging device 23 will be described with reference to FIG. 2 which is a perspective view showing a state where the punch tip 21 is mounted and FIG. 3 which is a perspective view showing a state where the punch tip 21 is disassembled into parts. .. First, the punch tip 21 is provided with a tap hole 31, and a stripper bolt 33 is erected on the tap hole 31 by screwing a screw portion 35 into the tap hole 31. Before the above-described screwing, the head portion 37 of the stripper bolt 33 is fixed. After the compression spring 39, the special washer 41 having a semi-cylindrical shape, and the special collar 43 having the lower end matched with the R shape of the punch tip 21 are attached, the screw portion 35 of the stripper bolt 33 is attached.
Is screwed into the tap hole 31 of the punch tip 21.

With the above structure, the attracting and urging device 23 having the punch tip 21 shown in FIG.
The operation of mounting and dismounting on and from will be described with reference to FIG. First, in FIG. 4A, the lower end of the special washer 41 is hooked to the lower end of the mounting space 27, and the rear surface of the punch tip 21 is also hooked to the front surface of the punch tip holding section 25. Then, as shown in FIG. 4 (b), while pushing the upper part of the attracting and urging device 23 from the front half of the depth of the mounting space 27, the punch chip 21 is also pulled downward to pull the punch chip holding part 25.
When pushed backward, it resists the urging force of the compression spring 39 and is shown in FIG.
As shown in (c), the punch tip 21 can be pushed into the center of the punch tip holding section 25. And
When the upper part of the attracting and urging device 23 is pushed into the mounting space 27, the punch tip 21 is moved to the punch tip holding part 25 by the urging force of the compression spring 39 of the attracting and urging device 23 as shown in FIG. Retained. Further, since the punch tip holding portion 25 has a V-shaped cross section, the punch tip 21 is automatically aligned with the punch tip holding portion 13 during bending.

The punch tip 21 is attached to the die holder 19
When leaving from, it can be achieved by performing the reverse operation described above.

As described above, if the attracting and urging device 23 is attached in advance to the punch tip 21 having various kinds of Rs, it is possible to perform various operations on the die holder 19 with one touch without using a tool such as a wrench. The punch tip 21 can be replaced.

However, when the small R punch tip 21B having an extremely small R of the punch tip 21 is attached to the die holder 19, the die holder 7 is too thick and interferes with the plate material during bending. Therefore, the punch tip holding section 25B provided with the chamfered section 45 in FIG. 1 is used. This can be easily understood by referring to FIGS. 5 (b) and 6 (b). When using the punch tip holding portion 25B, the die holder 19 is removed from the intermediate plate 13 and then repeatedly pulled up and down to put the punch tip holding portion 25B downward and to mount it again on the intermediate plate 13. I won't. However, the above operation does not require a lot of man-hours as described later.

By the way, the mold holder 19 is not limited to one type as shown in FIG. 1, that is, not only the first mold holder 19A but also a narrow one as shown in FIGS. 5 (a) and 6 (a). The second mold holder 19B, the third mold holder 19C having a wide width and a plurality of mounting spaces 27 provided at the upper and lower sides, or the fourth mold holder 19 with split ears as shown in FIG.
There are various types such as D, which can be appropriately used depending on the purpose of use.

For example, as shown in FIG. 7, punch tip 2
If 1 is long, the fourth mold holder 19D with split ears
To use. That is, the intermediate plate 13 is screwed to the upper apron 9. When the upper part of the fourth mold holder 19D is sandwiched by the lower part of the intermediate plate 13 and then tightened with the bolt 47, the fourth mold holder 19D is firmly fixed to the upper apron 9. Since the mold holder 19 has a Z-shaped cross section as described in FIG. 1, the vertical positioning can be easily performed.

Further, when the punch tip 21 is longer, the first, second and third gaps are provided between the fourth die holders 19D.
This can be dealt with by appropriately inserting the third mold holders 19A, 19B, 19C. Further, conversely, when the punch tip 21 is short, as shown in FIG. 8, the first, second and third die holders 19A, 19B and 19C are provided.
This can be dealt with by appropriately combining the above.

As described above, according to this embodiment, the divided punch tips 21 having various Rs are mounted on the die holder 19, or the unnecessary punch tips 9 are attached to the die holder 7.
There is an effect that the work efficiency is improved because it can be done with one touch without using a tool, even if it is detached from.

Further, the punch chip 2 in which R is greatly different
When replacing 1A and 21B, punch tip holding parts 25A and
Since it is possible to provide 25B, punch tip 21A
Does not become unstable, or the front and rear ends of the punch tip holding portion 25B do not interfere with the plate material during bending and cause no inconvenience. Further, in order to switch the punch tip holding parts 25A and 25B up and down, the mold holder 19 is detached from the intermediate plate 13 and repeatedly pulled up and down, and then the work of reattaching the bolt 47 is loosened or tightened. Since it can be done only by itself, it does not require a lot of man-hours and is effective in improving work efficiency.

Even when the punch tip 21 is replaced with one having an axial length, the die holder 19 has the first, second, third and fourth die holders 19A, 19B, 1 having various widths and shapes.
Since there are 9C and 19D, it is possible to easily deal with them.

The present invention is not limited to the description of the above-mentioned embodiments, but other modifications can be made, for example, by changing the cross section of the punch tip holding portion to a ladder shape instead of a V shape. It can be implemented in various ways.

[0030]

As can be understood from the above description of the embodiments, according to the present invention, if R-shaped punch chips having various Rs are provided as a punch chip set mounted on an attracting and urging device, This punch tip set can be attached / detached to / from the punch tip hold part of the die holder and the mounting space with one touch without using a tool, and the number of man-hours can be drastically reduced to improve work efficiency. There is.

[Brief description of drawings]

FIG. 1 is a perspective view showing the shape of a mold holder.

FIG. 2 is a perspective view showing an attracting and urging device.

FIG. 3 is a perspective view in which the attracting and urging device is disassembled into parts.

FIG. 4 is an operation explanatory view showing an operation of mounting the punch chip set in which the punch chips are mounted on the attracting and urging device to the mold holder.

FIG. 5 is an explanatory view of a die holder having a bunch tip holding portion suitable for a large R punch tip.

FIG. 6 is an explanatory diagram of a die holder having a punch tip holding portion suitable for a small R punch tip.

FIG. 7 is a front view showing an example in which a die holder holding a punch chip is attached to an upper apron via an intermediate plate.

8 is a front view showing another example in FIG. 7. FIG.

FIG. 9 is a left side view showing an outline of a press brake.

[Explanation of symbols]

 1 R Bending Die 19 Die Holder 21 Punch Chip 23 Energizing Biasing Device 25 Punch Chip Hold Part 27 Mounting Space

Claims (1)

[Claims] 1. A punch tip holding portion for holding an arbitrary R-shaped punch tip is provided on at least one of the tips of the die holders, and the punch tip holding portion is urged in a direction to attract the punch tip. R bending, wherein an appropriate number of attracting and urging devices are provided on the punch chip, and an appropriate number of mounting spaces for detachably attaching and storing the attracting and urging devices are provided on the die holder. Mold.