JPH0976018A - Device for adjusting positioning of die in press bleak - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve bending precision and to deal with a thin sheet by equalizing a die length to a bending length. SOLUTION: An upper die 17 is constituted by fixedly providing with a center die 25 at the center part of an upper table 13, movably providing with side dies 27R and 27L to the both sides of the center die 25 and movably providing with plural reference dies 29R and 29L to right and left sides of side dies 27R and 27L. Only side dies 27R and 27L are provided so as to changeably move to the right and left by a screw member 39 provided with right and left screws 37R and 37L with equal right and left gaps S with respect to the center die 25. By this way, the die length is equalized to the bending length, thereby improving bending precision and dealing with bending of the thin sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold position adjusting device for a press brake, and more specifically, by forming a gap between molds, the bending length and the mold length are made equal to each other, and a thin plate is formed. The present invention relates to a mold position adjusting device for a press brake that is compatible with bending.

[0002]

2. Description of the Related Art Conventionally, in a press brake mold, for example, when the minimum unit of the length l of the mold 101 is 5 mm, as shown in FIG.
Is 999 mm, the length l of the mold 101 is 995 mm
Becomes Therefore, the short portion of 4 mm is distributed to the gap S between the left and right works W, and the bending work is performed in a state where the mold 101 is not pressing the work W by 2 mm on each side.

[0003]

By the way, in the above-mentioned conventional press brake mold construction, from the bending experience value,
Except for special materials, the gap S, which is almost the same as the plate thickness, is used for the mold 10.
Even if it is between 1, there will be no problem with respect to the inside R of the product. Further, in the box-shaped corner portion, it is okay if this dimension is larger.

However, in the case of the work W in which the plate thickness is thin or the shape of the inside R of the bend has a great influence on the gap S of the die 101, the method of forming the gap S at both ends is limited. Further, when an operator manually fixes the split mold, a plurality of gaps are formed between the molds and the bending length L and the mold length 1 are matched, but it takes a lot of manpower and time. There was a problem.

It is an object of the present invention to provide a mold position adjusting device for a press brake capable of improving the bending accuracy by making the mold length equal to the bending length and corresponding to a thin plate.

[0006]

In order to achieve the above object, a mold position adjusting device in a press brake according to the present invention according to claim 1 is provided with a plurality of split dies on a guide rail extending in the longitudinal direction of a table. A mold is provided slidably, a center mold is fixed to the table as a split mold in the center, and side molds are movably provided on both sides of the center mold. A plurality of reference dies are movably provided on the left and right sides, and only the side dies located on both sides of the center die can be moved toward and away from the left and right sides with respect to the center die. The gap is provided so that it can be changed evenly on the left and right.

Therefore, by appropriately setting the gap between the center mold and the side mold, the bending length can be made equal to the mold length, the bending accuracy can be improved, and bending of a thin plate can be supported. Become.

According to a second aspect of the present invention, there is provided a die position adjusting device for a press brake according to the present invention, wherein a center die is fixed to the table in the center as the split die.
A plurality of side molds are movably provided on both sides of the center mold, and a plurality of reference molds are movably provided on the left and right ends of the side mold. Move multiple side dies provided on both sides to the left and right sides so that they can move toward and away from each other freely. It is characterized in that the gap between the molds is movably provided with the same amount of movement.

Therefore, by appropriately setting the gap between the center mold and each side mold, it is possible to make the bending length equal to the mold length, improve the bending accuracy, and cope with bending of a thin plate.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

First, in order to facilitate understanding, for example, the overall structure of the press brake will be briefly described.

Referring to FIGS. 4 and 5, the press brake 1 is provided with a movable lower table 7 which is moved up and down by a hydraulic cylinder 5 at a lower portion of a machine body 3, and a supporting member 9 is interposed above the lower table 7. The lower die 11 is installed. Further, the upper mold 1 is attached to the lower end of the fixed upper table 13 hanging from the upper part of the machine body 3 via the support member 15.
7 is mounted, and clamping devices 19 and 21 are provided at a plurality of positions for fixing the upper mold 17 and the lower mold 11 together.

With the above structure, the work W is bent by cooperation between the upper mold 17 and the lower mold 11.

Next, a mold position adjusting device, which is a main part as an example of the embodiment of the present invention, will be described in detail.

Referring to FIG. 1, the upper table 13
A guide rail 23 extending in the lower longitudinal direction is provided, and the upper mold 17 is engaged with the guide rail 23.

The upper mold 17 is a split mold, and a center mold 25 is fixed to the upper table 13 by an appropriate means at the center, and side molds 27R are provided on both sides of the center mold 25. 27L is movably provided. A plurality of reference dies 29R and 29L are movably provided on the left and right sides of the side dies 27R and 27L.

In the mold position adjusting device 31, the right screw nut 35R and the left screw nut 35L are integrally provided on the brackets 33R and 33L fixed to the side molds 27R and 27L. The right screw nut 35R and the left screw nut 35L are screwed with a screw member 39 formed with a right screw 37R and a left screw 37L, and both ends of the screw member 39 are bearings provided on the side surface of the upper table 13. 41R, 41L
It is rotatably supported on. A driven pulley 43 is fixed near the center of the screw member 39.

On the other hand, a drive motor (servo motor) 45 for rotating the screw member 39 is fixed to the front surface of the upper table 13, and an output shaft 47 of the drive motor 45 is integrally provided with a drive pulley 49. A belt 51 is wound around the drive pulley 49 and the driven pulley 43, and the rotation of the drive motor 45 is transmitted to the screw member 39.

With the above configuration, the operation will be described by limiting the numerical value as an example, but the present invention is not limited to this numerical value.

Among the upper dies 17 which are the split dies, the center die 25 has 20 lateral widths, for example, from 100 mm to 5 mm and up to 195 mm, which is used for length adjustment in 5 mm units. The lateral width of each of the side molds 27R and 27L is 125 mm. Furthermore, the reference molds 29R, 29
The width of one L is 100 mm.

To make the gap S corresponding to the bending length of the work W of 804 mm by using each of the above-mentioned molds, the reference mold 2 is used.
A total of four 9R and 29L are used, and the width of each is 100 mm.
Therefore, it becomes 400 mm. Side mold 27R, 27
Two L are used on the left and right, and the width is 250 mm because each width is 125 mm. There is one center mold 25, and the width of this center mold is 150 mm.

The total width of the mold is 400 mm + 250.
mm + 150 mm = 800 mm, which is 4 mm short of the bending length 804 mm of the work W. Therefore, this 4
When mm is distributed to the gap S, one side is 2 mm.

The NC device (not shown) issues a command to the drive motor 45, which is a servo motor, so that the gap S becomes 2 mm. The drive pulley 45, the belt 51, and the driven pulley 43 are rotated by the rotation of the drive motor 45, and the driven pulley 4
The right screw nut 35 screwed into the right screw 37R and the left screw 37L by rotating the screw member 39 in which 3 is integrally connected.
Side mold 27R through R and left screw nut 35L,
Open 27L to the left and right. Then, the drive motor 45 is rotated until the gap S becomes 2 mm, and the mold length is 804 mm.
And

Thus, by making the bending length equal to the mold length, it is possible to improve the bending accuracy and to cope with bending of a thin plate.

Another example is shown in FIG. 2, which is an example in which the gap S is equally divided into four places. That is, the bending length of the work W described above is 804 mm, and the mold length is 800.
Since it is mm, there is a shortage of 4 mm, and each gap S that distributes this 4 mm into four gaps S is set to 1 mm. At this time, the mold length is 802 mm, and a gap S of 1 mm is formed between the inner surfaces of the left and right works W, respectively. In addition, when the gaps S are formed at four locations, the maximum width S is 1.25 mm because the lateral width of the mold 25 is prepared in units of 5 mm.

FIG. 3 shows another example of the embodiment of the present invention. In this example, side molds 27R and 27L are divided from the above-described example of the embodiment, and a total of 10 gaps are provided on each of the left and right sides.
The same reference numerals are given to the same members, and the description is omitted. In addition,
The figure shows the left half, but the right half is also symmetrical.

That is, the side molds 53A to 53E adjacent to the center mold 25 are made by dividing the side mold 27R used in the above-mentioned first example into five to form five gaps S / 5. Therefore, a plurality of reference molds 29L are provided adjacent to the side mold 53E.

Brackets 55A to 55E are fixed to the side molds 53A to 53E, respectively. Left bracket nuts 57A to 57E are integrally provided on the brackets 55A to 55E, and the left screw nut 57A is provided. ~
57E includes a screw member 61 having left-hand screws 59A to 59E.
Are screwed together. Both ends of the screw member 61 have the bearing 4
1L and 41R (not shown) are rotatably supported,
A driven pulley 43 is integrally provided near the center of the screw member 61, and a belt 51 is wound around the drive pulley 49 and the driven pulley 43 provided on a drive motor 45, which is a servo motor, although not shown. Has been done.

Left-hand screw 59A provided on the screw member 61
The number of leads for the 59E screw is 1n for the left screw 59A.
The left screw 59B is the lead 2n, the left screw 59C is the lead 3n, the left screw 59D is the lead 4n, and the left screw 59E is the lead 5n.

With the above-described structure, as its function, the drive motor 45, which is a servo motor, is driven, and the screw member 61 is rotated via the drive pulley 49, the belt 51, and the driven pulley 43. The side dies 53A to 53E can be moved to the outside through the left screw nuts 57A to 57E by the left screws 59A to 59E having different numbers of leads by the rotation of the screw member 61. For example, the side mold 53
When A is moved by 1 mm and the gap S / 5 is set to 1 mm, the side die 53B moves outward by 2 mm and the gap S / 5 between the side die 53A and the side die 53B becomes 1 mm. Similarly, the side mold 53c is 3 mm outward, and the side mold 53D is
Moves 4 mm to the outside and the side mold 53E moves 5 mm to the outside, so that all the gaps S / 5 become 1 mm.

Therefore, initially all side molds 53A-5
From the closed state of 3E, the gap S / 5 between the side molds 53A to 53E can be set to 1 mm. Since this is on the left and right sides, the gap S / 5 is 1
0 places.

In the example of the first embodiment described above, the gap S on one side was 2 mm, but in the example of this embodiment, the gap S / 5 is 0.4 mm and the mold length is 804 mm. It can be matched.

Thus, by making the bending length equal to the mold length, the bending accuracy can be improved, and a plurality of gaps narrower than the plate thickness can be formed so that the thin plate can be bent.

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

[0035]

As can be understood from the above description of the embodiments, the present invention according to claims 1 and 2 provides a plurality of gaps between the molds by the mold position adjusting device. By making it, the bending length and the mold length can be made equal, and the bending accuracy can be improved. Further, gaps narrower than the thickness of the plate can be formed at a plurality of places, so that it is possible to handle thin plates.

[Brief description of drawings]

FIG. 1 is a front view showing a mold position adjusting device provided in an upper mold, showing a main part of the present invention.

FIG. 2 is a diagram for explaining another operation of the present invention.

FIG. 3 is a front explanatory view of a mold position adjusting device provided in an upper mold, showing an example of another embodiment of the present invention.

FIG. 4 shows an example of an embodiment of the present invention,
It is a front view of a press brake.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is an explanatory view showing a conventional example and showing a positional relationship between a bending length and a mold length.

[Explanation of symbols]

 13 Upper table (table) 23 Guide rail 25 Center mold 27R, 27L, 53A to 53E Side mold 29R, 29L Reference mold 31 Mold position adjusting device 37R Right screw 37L, 59A to 59E Left screw 39, 61 Screw member S gap

Claims (2)

[Claims] 1. A guide rail extending in the longitudinal direction of a table is slidably provided with a plurality of split molds, and a center mold is fixedly provided on the table in the center as the split molds. Side molds are movably provided on both sides of the center mold, and a plurality of reference molds are movably provided on the left and right sides of the side mold. Sides located on both sides of the center mold. A mold position adjusting device for a press brake, wherein only the mold is moved to the left and right sides so as to be able to move toward and away from each other so that the gap can be evenly changed left and right with respect to the center mold. 2. A center mold, which is fixed to the table, is provided in the center as the split mold, and a plurality of side molds are movably provided on both sides of the center mold. A plurality of reference dies are provided movably at the left and right ends, and a plurality of side dies provided on both sides of the center die are moved toward and away from each other so that the side adjacent to the center die. 2. The press brake according to claim 1, wherein, based on the amount of movement of the die, the side die used as a reference is provided so as to be movable by the same amount of movement as the gap between the side dies. Mold position adjusting device.