JPH06262263A - Device for clamping press brake upper die - Google Patents

Abstract

PURPOSE:To provide a press brake upper die clamping device where an upper die being required for machining an article can be easily prepared, and an operating time is drastically shortened by eliminating the upper die attaching operation. CONSTITUTION:A press brake is provided with an upper table 4 including an upper die 11, and a lower table including a lower die and moving vertically, and bends an article by ascending the lower die. An upper clamping device is composed of a 1st upper holder 31 provided at a lower end of the upper table 4, upper die fixing bodies 32, 33, 34, 35 engaged with the holder 31 to be slidable and capable of fixing the upper die 11, a 1st clamp holder 36 capable of fixing or removing the upper die fixing bodies, a clamp driving clamp tensile bolt 37 applying a tightening force on the holder 36 or releasing the tightening force, a holder coil spring 38, a clamp tensile plate 39, a clamping screw 40, a pinion 41, a rack 42, a piston rod 44 and a clamp cylinder 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press brake upper die clamping device, and in particular, when bending a large number of products in small quantities, a plurality of upper dies having different widths are combined to form an upper table. The present invention relates to a press brake upper die clamp device used for mounting.

[0002]

2. Description of the Related Art In this type of press brake, a product is placed between an upper table having an upper die attached thereto and a lower table having a lower die attached thereto, and the lower table is raised to bring the upper and lower die into contact with each other. It is known as a device that can bend products by doing so. Further, this press brake is provided with an upper die clamp device for fixing the upper die to the upper table according to the width of the product to be bent.

6 and 7 show a press brake, FIG. 6 is a front view of the same apparatus, and FIG. 7 is a side view of the same apparatus.

In these figures, the press brake 1
Is an upper table 4 fixed to an upper fixing portion 3 of the main body 2,
The lower table 5 is provided below the main body 2 and moves up and down. Further, upper molds 11, 11, ... With a plurality of widths are fixed to the upper table 4.
A lower die 12 is fixed to the lower table 5. Reference numeral 13 is a pedal used when driving the lower table 5.

8 and 9 show a conventional upper mold clamping device used in the press brake 1, FIG. 8 is a perspective view of the device, and FIG. 9 is a case where the upper mold is attached using the device. FIG.

As shown in FIGS. 8 and 9, the upper die clamping device includes an upper die holder 21, a first clamp holder 22,
The second clamp holder 23 is provided and configured as follows. The upper die holder 21 is tightened with the bolts 24 of the first clamp holder 22 as shown in FIG.
It is fixed in a state of being sandwiched between the first clamp holder 22 and the upper table 4. In this upper mold holder 21,
A second clamp holder 23 is provided via a bolt 25. As shown in FIG. 9, the upper die 11 is fixed to the upper die holder 21 while being sandwiched between the upper die holder 21 and the second clamp holder 23.

By the way, the upper mold 11 has various widths, and it is necessary to combine various upper molds 11 according to the product to be bent and fix them to the upper table 4 by the upper mold clamping device.

Therefore, in the case of the conventional upper mold clamping device, the upper molds 11 having various widths are prepared according to the product, and the upper molds 11 are provided with the second clamp holder 23 and the upper mold holder 2.
1, and each bolt 25 is temporarily fixed by manually turning each bolt 25 using a tool 26 such as a hexagonal wrench, and then the lower table 5 is lifted to lift the upper die 11 and the lower die 12 as shown in FIG.
After the and are brought into close contact with each other, each bolt 25 is turned by hand to finally fix the upper mold 11 to the upper mold holder 21.

[0009]

In the conventional upper die clamping device as described above, when bending a wide variety of products in a small amount, a plurality of products having a plurality of widths are formed in accordance with the width of the products to be bent. It is necessary to combine the mold 11 and fix it to the upper table 4, but since the upper mold 11 is fixed by the method described above, the following drawbacks occur.

(1) It is necessary to carry the upper mold 11 or to set aside the upper mold 11, which wastes work, and is poor in safety because it is carried by hand.

(2) When fixing the upper die 11 to the upper table 4, it is necessary to use the tool 26 and manually rotate it, so that it takes a long time to mount it.

(3) The tightening force of the second clamp holder 23 for tightening the upper die 11 varies, and there is a risk of falling in the case of the long die 11 having a long weight. The present invention provides a press brake upper die clamping device which solves the above-mentioned drawbacks, can easily prepare an upper die necessary for processing a product, and eliminates the work of mounting the upper die to significantly reduce the working time. The purpose is to do.

[0013]

In order to achieve the above object, a press brake upper die clamping device of the present invention includes an upper table including an upper die and attached to an upper fixed base, and a lower die including a lower die that moves up and down. A press brake having a table, the product being placed between the upper mold and the lower mold, and the lower table being lifted to bring the upper mold and the lower mold into contact with each other. In a press brake upper die clamping device capable of combining upper dies of a plurality of widths according to the width of a product to be mounted on an upper table, a slide rail provided at a lower end of the upper table and a slide rail engaged with the slide rail. Can move,
An upper mold fixing body that can fix the upper mold, a first clamp holder that can fix or unfix the upper mold fixing body, and a clamp drive mechanism that applies a clamping force to the first clamp holder or releases the clamping force. It is characterized by having and.

Further, it is preferable that the upper die fixing body has a structure in which the slide holder and the upper die engaging with the slide rail can be fixed to the upper die holder by the second clamp holder.

Further, the clamp driving mechanism includes a clamp pulling bolt for fixing the first clamp holder, a clamp pulling plate engaging with the clamp pulling bolt, a rack and a pinion capable of driving the clamp pulling plate. A clamp cylinder for moving the rack is provided.

[0016]

In the press brake upper mold clamping device of the present invention, the slide rail is provided at the lower end of the upper table, and the upper molds having a plurality of widths are all hung on the slide rail by the upper mold fixing body for processing. The upper body of a plurality of widths is combined with the required product width, and the first clamp holder is tightened by the clamp drive mechanism to fix the fixed body to the upper table. This allows the required product to be bent.

Further, according to the present invention, when bending products of other widths, the first clamp holder is released from being fixed by the clamp driving mechanism, and again the upper molds of a plurality of widths are combined with the width of the product, By fixing the first clamp holder by the clamp mechanism again, the fixed body is fixed to the upper table. This allows bending of products of other widths again.

[0018]

The present invention will be described below with reference to the illustrated embodiments.

1 to 5 show an embodiment of a press brake upper mold clamping device of the present invention, and FIG. 1 is a front view of the device.
2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, FIG. 4 is a view taken in the direction of arrow C of FIG. 3, and FIG. 5 is a perspective view of the apparatus.

The upper clamp device is provided in the above-mentioned press brake 1 (see FIGS. 6 and 7) and has the following structure. That is, the first upper die holder 31 that functions as a slide rail is fixed to the lower end of the upper table 4 with a length that matches the lower end width of the upper table 4.

The slide holder 33 and the upper die 11 are attached to the second upper die holder 32 as the second clamp holder 34.
Semi-fixed by. The second upper mold holder 3
2, slide holder 33, and second clamp holder 3
4 having a plurality of lengths (widths) are prepared in accordance with the width of the upper mold 11. The slide holder 33 has a concave shape, and a slide bearing 35 is provided inside the concave shape.
Is provided. The slide holder 33 is slidably engaged with the first upper die holder 31 with the slide bearing 35 side inside the concave portion facing the upper table 4 side. The slide holder 33 is fixed to the upper table 4 by tightening the first clamp holder 36, and is slidable on the first upper die holder 31 by loosening the first clamp holder 36. The second upper die holder 32, the slide holder 33, the second clamp holder 34, and the slide bearing 35 constitute a fixed body for fixing the upper die 11.

The first clamp holder 36 is fixed to the upper table 4 with clamp pulling bolts 37. A clamping force is applied to or released from the first clamp holder 36 by the clamp drive mechanism.

A holder coil spring 38 is disposed between the inside of the first clamp holder 36 and the upper table 4, and the holder coil spring 38 urges the first clamp holder 36 to the left side in FIG. is doing. The clamp pulling bolt 37 is provided with a clamp pulling plate 39. The clamp pulling plate 37 is moved by rotating the clamp screw 40 engaged with the clamp pulling plate 39.
It is possible to generate a tightening force to or to release the tightening force.

A pinion 41 is fixed to the clamp screw 40, and the pinion 41 is rotated by being driven by a rack 42. The rack 42 is fixed to a piston rod 44 via a connecting plate 43. This piston rod 44
Is fixed to a piston (not shown) of the clamp cylinder 45. The clamp cylinder 45 moves the piston rod 44 left and right in FIG. 4 by, for example, differential pressure air supplied from the outside.

The clamp pulling bolt 37, the holder coil spring 38, the clamp pulling plate 39, the clamp screw 40, the pinion 41, the rack 42, the connecting plate 43, the piston rod 44, and the clamp cylinder 4 are used.
A clamp drive mechanism is constituted by 5.

The operation of this embodiment will be described.

First, the pressurizing air for release is supplied to the clamp cylinder 45 to move the rack 42. This causes the pinion 41 to rotate in the releasing direction. Then,
The clamp screw 40 moves the clamp pulling plate 39 in the releasing direction. As a result, the clamp pull bolt 37
Can be moved in the releasing direction (left side in FIG. 2). Then,
The urging force of the holder coil spring 38 loosens the first clamp holder 36.

In such a state, the upper dies 11 having a plurality of widths are combined in accordance with the width W of the product 50 to be bent, and the length after the upper dies 11 are combined is the width of the product 50. Adjust to W (see FIG. 5). This is because the upper mold 11 having a predetermined width is combined with another upper mold 1
1 is located on the left and right ends, and the second upper mold holder 3
The slide holder 33 and the second clamp holder 34 can be obtained by sliding the slide holder 33 and the second clamp holder 34 together on the first upper die holder 31.

Then, by supplying pressurized air for operation to the clamp cylinder 45 and moving the rack 42 in the tightening direction, the pinion 41 is rotated in the tightening direction. Then, the clamp screw 40 rotates in the tightening direction. Then, the clamp screw 40 moves the clamp pulling plate 39 in the tightening direction. As a result, the clamp pulling bolt 37 is moved in the tightening direction (right side in FIG. 2). Then, the first clamp holder 36 tightens the slide holder 33 against the biasing force of the holder coil spring 38.

By moving the lower table 5 up and down in such a state, the product 50 can be bent by the upper mold 11 and the lower mold 12.

When a product having a width different from that of the product 50 is bent, the fixing of the first clamp holder 36 is released by the clamp driving mechanism, and the upper mold 11 having a plurality of widths is added to the width of the product. If the combination is correct, the first clamp holder 36 is tightened again by the clamp mechanism to move the fixed body to the upper table 4
Fixed to. This will allow bending of products of other widths again.

The upper mold 11 which is not necessary for the bending process
Is suspended at the end of the first upper die holder 31, as shown in FIG.

According to such an embodiment, there are the following advantages. (1) By suspending the upper mold 11 on the upper table 4 at all times, it becomes unnecessary to carry the upper mold 11.

(2) Since the first clamp holder 36 can be tightened and released by using the pressurized air for operation, the fixing work of the upper die 11 is not necessary and the fixing work can be shortened significantly. You can

(3) Since the upper die 11 is always hung and placed on the upper table 4, the upper die 11 does not drop even in the tightened and released state.

(4) The clamping force of the upper mold 11 is, for example, 3
Since it is stable over the entire length of [m], the product has less fluctuation.

(5) The fixing time of the conventional upper mold 11 is 74
In contrast to this, it takes 21 seconds in the present embodiment, and the average time for the upper die setup becomes ¼ to ⅓ of the conventional time.

[0038]

As described above, according to the present invention, there is an effect that the upper die is not transported and the time for the upper die setup work can be greatly reduced.

Further, according to the present invention, there is an effect that the upper mold is prevented from falling and the safety is improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a press brake upper die clamping device of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a view on arrow C in FIG.

FIG. 5 is an explanatory diagram of the embodiment.

FIG. 6 is a front view of a press brake.

FIG. 7 is a side view of the press brake.

FIG. 8 is a perspective view of a conventional upper clamp device.

FIG. 9 is a cross-sectional view of the same device.

[Explanation of symbols]

 1 Press Brake 2 Main Body 3 Upper Fixed Part 4 Upper Table 5 Lower Table 11 Upper Die 12 Lower Die 31 First Upper Die Holder 32 Second Upper Die Holder 33 Slide Holder 34 Second Clamp Holder 35 Slide Bearing 36 First Clamp holder 37 Clamp pull bolt 39 Clamp pull plate 40 Clamp screw 41 Pinion 42 Rack 45 Clamp cylinder

Claims (3)

[Claims] 1. An upper table including an upper die and attached to an upper fixed base, and a lower table including a lower die, which moves up and down, and a product is placed between the upper die and the lower die, and the lower table. It is installed in a press brake that can bend the product by raising and lowering the upper and lower dies, and a press brake that can combine upper dies of multiple widths according to the width of the product to be bent and attach it to the upper table. In the upper mold clamping device, a slide rail provided at a lower end of the upper table, an upper mold fixing body capable of engaging with the slide rail and sliding, and fixing the upper mold, and fixing or fixing the upper mold fixing body. A first clamp holder that can be released, and a clamp drive mechanism that applies a tightening force to the first clamp holder or releases the tightening force. Upper press brake tool clamp device according to claim. 2. The upper die fixing body has a structure in which a slide holder and an upper die that engage with a slide rail can be fixed to the upper die holder by a second clamp holder. Press brake upper mold clamping device. 3. The clamp drive mechanism includes a clamp pulling bolt for fixing the first clamp holder, a clamp pulling plate engaging with the clamp pulling bolt, a rack and a pinion capable of driving the clamp pulling plate, The press brake upper mold clamping device according to claim 1, further comprising a clamp cylinder for moving the rack.