JP2000343125A - Press brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press brake which can improve threading accuracy by easily preventing a center sagging of a table at a low cost, without using a complicated crowning device. SOLUTION: Crowning is performed at a time of bend processing with left and right slits 11L, 11R installed on an upper table 5U or a bottom table 5L. The slits 11L, 11R comprise a first slit 11A, a second slit 11B and a third slit 11C being connected smoothly. At almost a center between the starting ends 13 of the slits 11L, 11R and the second slits 11B arranged in a vertical direction at the left, right end parts of the upper table 5U or the bottom table 5L, end terminals 15 are positioned. Round holes are provided with the starting ends 13 and the end terminals 15. An elastic member may be filled in the slits 11L, 11R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press brake for bending a work.

[0002]

2. Description of the Related Art Referring to FIG. 6, in a conventional press brake 101 having upper and lower cylinders 105 at both ends of an upper table 103U, an upper and lower table 103 is provided.
U and 103L had a "crossing", and the precision was not obtained, resulting in reduced processing precision.

Therefore, as shown in FIG. 7, the lower table 103L is tripled and fixed at a center portion by a connecting pin 107 to prevent dripping of the lower table 103L.

[0004] Alternatively, as shown in FIG. 8, as in a press brake 109 disclosed in Japanese Utility Model Registration No. 25558928, slits 111 are provided symmetrically inward from near the left and right ends of the lower table 103L.
Some slits 111 are provided with adjustment pieces 113 for adjusting the warpage of the lower table 103.

[0005]

However, when three lower tables 103L are stacked, the cost increases.

Further, a slit 1 is provided in the lower table 103L.
In the case where the slit 111 is provided with an adjustment top 113, the lower table 1 is provided by the slit 111.
03L becomes weak in strength, and when the table length becomes about 3 m, there is a problem that it does not bend in parallel.

Further, as shown in FIG. 9, depending on the shape of the slit 115, there is a problem that the lower table 103L is excessively bent in the opposite direction with respect to the upper table 103U, so that the passing accuracy may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to pay attention to the above-mentioned conventional technology, and to improve the accuracy by preventing dripping of a table at low cost without using a complicated crowning device. An object of the present invention is to provide a press brake that can be operated.

[0009]

According to a first aspect of the present invention, there is provided a press brake, in which an upper table and a lower table are relatively moved up and down by cooperation of an upper mold and a lower mold. A press brake for bending a work, wherein slits are provided on both left and right sides of the upper table or the lower table, and each of the slits extends outward from a starting end provided at the center of the upper table or the lower table slightly outside. A first slit extending diagonally upward toward the second slit, a second slit extending vertically downward from the first slit, and an obliquely extending from the second slit toward an end provided near a lower center of the upper table or the lower table. And a third slit extending upward.

Therefore, the upper table or the lower table is deformed by the action of the left and right slits formed by the first slit, the second slit, and the third slit provided on the upper table or the lower table, and crowning is performed during bending. Do.

The press brake of the invention according to claim 2 is
2. The press brake according to claim 1, wherein a horizontal distance from the start end to the second slit is substantially twice a horizontal distance from the end end to the second slit.

Therefore, the terminal end is located substantially at the center between the starting end of the slit and the second slits provided in the up-down direction at the left and right ends of the upper table or the lower table.

The press brake of the invention according to claim 3 is
The press brake according to claim 1, wherein a round hole is provided at the start end and the end.

Therefore, round holes are provided at the start and end of the left and right slits, respectively.

The press brake of the invention according to claim 4 is
The press brake according to any one of claims 1 to 3, wherein a connecting portion between the first slit and the second slit and a connecting portion between the second slit and the third slit are smooth. Things.

Therefore, the first, second and third slits forming the left and right slits are smoothly continuous.

The press brake of the invention according to claim 5 is
The press brake according to any one of claims 1 to 4, wherein the slit is filled with an elastic member.

Therefore, when the upper table or the lower table is deformed during processing, the slit is deformed together with the filled elastic member.

The press brake of the invention according to claim 6 is
A press brake for bending a work by cooperation of an upper die and a lower die by relatively moving the upper table and the lower table up and down. And a resilient member fitted into the slit.

Therefore, when the upper table and the lower table are relatively moved to perform the processing, the elastic members fitted into the left and right slits provided horizontally from the ends of the upper table or the lower table are deformed. And do crowning.

[0021] The press brake of the invention according to claim 7 is as follows.
The press brake according to claim 6, wherein the elastic member is urethane, and a case for storing the urethane;
A lid for sandwiching the urethane from above and below is provided.

Therefore, when the upper table and the lower table are relatively moved to perform the processing, the urethane fitted in the left and right slits provided in the upper table or the lower table is deformed and crowning is performed. .

The press brake of the invention according to claim 8 is:
The press brake according to claim 6, wherein the elastic member is a spring.

Therefore, when the upper table and the lower table are relatively moved to perform processing, the springs fitted in the left and right slits provided in the upper table or the lower table bend, thereby crowning. Do.

The press brake of the invention according to claim 9 is
The press brake according to any one of claims 6 to 8, wherein the lower table or the upper table is prevented from being bent by a predetermined amount or more inside the slits at left and right ends of the upper table or the lower table. And interval adjusting means for adjusting the interval between the slits,
It is characterized by comprising.

Therefore, when the upper table and the lower table are relatively moved to perform processing, the upper table or the lower table is deformed within a range of the slit interval adjusted by the interval adjusting means until the stopper hits the stopper. And do crowning.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings. Since the press brake is already well known, a detailed description thereof will be omitted, and only a brief description will be given.

FIG. 1 shows a press brake 1 according to the present invention. In the press brake 1, an upper table 5U is provided on the upper front surfaces of the left and right frames 3L and 3R so as to be able to move up and down, and a lower table 5L is fixedly provided on the lower front surface of the frames.

A pair of upper and lower cylinders 7L and 7R for raising and lowering the upper table 5U are provided on the upper front surfaces of the frames 3L and 3R.
The upper table 5U is lowered by the 7R, and the work W is bent by cooperation of the upper mold 9U attached to the lower end face of the upper table 5U and the lower mold 9L attached to the upper end face of the lower table 5L. I do.

The lower table 5L is provided with slits 11L and 11R symmetrically. Since the left and right slits 11L and 11R are provided symmetrically with respect to the center CL of the lower table 5, only the left slit 11L will be described in the following description.

The slit 11L is connected to the lower table 5L
A first slit 11A extending diagonally upward from the vicinity of the center toward the left and right outer sides, and a second slit 11B connected to the outer end of the first slit 11A and extending downward
And a third slit 11C connected to the lower end of the second slit 11B and slightly rising toward the center of the lower table 5L. A round hole is provided at each of the start end 13 and the end 15 of the slit 11L.

As shown in FIG. 1, the positional relationship between the starting end 13 and the end 15 of the slit 11L is L1: L
It has been empirically known that an ideal crowning curve can be obtained by setting 2 = 1: 1. Here, L1
Denotes a horizontal distance between the start end 13 and the second slit 11B, and L2 denotes a horizontal distance between the end end 15 and the second slit 11C.

The left and right ends of the lower table 5L are provided with vertically long fixing holes 17L and 17R for attachment to the frames 3L and 3R of the press brake 1.

With the above configuration, the upper and lower cylinders 7L, 7R
When the workpiece W is bent by lowering the upper table 5U, as shown in FIG. 2, a linear slit 1 provided in the lower table 5L is conventionally provided.
It has the same operation and effect as the structure provided with the spring 9 and the spring 21.

From the above results, when a load is loaded on the lower table 5L, the slits 11L and 11R function in the same manner as the conventional crowning device, so that the upper die 9U and the lower die 9L can be formed by a simple and low-cost device. The spacing between the cutting edges becomes uniform, so that the precision is improved and high-precision machining can be performed.

It should be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes,
It can be implemented in other aspects. That is, in the above-described embodiment of the present invention, the case where slits 11L and 11R are provided in lower table 5L has been described, but slits 11L and 11R may be provided in upper table 5U.

In the embodiment of the invention described above, the slits 11L and 11R are made spaces without filling, but urethane may be put in the slits 11L and 11R.

Next, a press brake 23 according to another embodiment of the present invention will be described with reference to FIG.
Since the press brake 23 has been outlined in the above-described embodiment of the present invention, common portions are denoted by the same reference numerals, and redundant description will be omitted.

The lower table 5 of the press brake 23
Left and right slits 25L, 25R are horizontally provided from the center to both outer ends at the center in the height direction at both left and right ends of L, and a round hole 27 is formed at the center end of each of the slits 25L, 25R. Is provided.

Referring to FIGS. 4A and 4B together,
Inside the slits 25L and 25R, a metal case 33 filled with, for example, urethane 29 as an example of an elastic member and covered with upper and lower lids 31U and 31L is fitted.

Referring also to FIG. 5, bolts 35 are provided at both left and right ends of the slits 25L and 25R as gap adjusting means.
The vertical distance between L and 25R is adjustable. Therefore,
After fitting the above-described case 33 into the slits 25L and 25R, the bolts 35 are used to prevent the urethane 29 from rattling.
To preload.

The bolt 35 has a slit 25.
A stopper 37 is provided in L and 25R to prevent the lower table 5L from being excessively bent.

With the above configuration, the upper table 5U is lowered by the upper and lower cylinders 7, and the upper die 9U attached to the upper table 5U and the lower die 9L attached to the lower table 5L cooperate with the work W. When performing bending, the slit 2 provided in the lower table 5L
The urethane 29 fitted in the 5L and 25R bends. Therefore, the center of the lower table 5L is not displaced,
Since the lower table 5L bends at both left and right ends, crowning can be easily performed with a low-cost and simple device.

It should be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes.
It can be implemented in other aspects.

[0045]

As described above, in the press brake according to the first aspect of the present invention, the left and right slits including the first slit, the second slit, and the third slit provided on the upper table or the lower table act. Since the upper table or the lower table is deformed to perform crowning at the time of bending, uniform bending can be performed with high accuracy by using a low-cost apparatus.

In the press brake according to the second aspect of the present invention, the end is located substantially at the center of the starting end of the slit and the second slits provided in the vertical direction at the left and right ends of the upper table or the lower table. By doing so, appropriate crowning can be performed.

In the press brake according to the third aspect of the present invention, since the left and right slits have round holes at the start and end, both ends of the slit are reinforced.

In the press brake according to the fourth aspect of the present invention, since the first slit, the second slit, and the third slit forming the left and right slits are smoothly connected, an appropriate deformation can be obtained.

In the press brake according to the fifth aspect of the present invention, when the upper table or the lower table is deformed during processing, the slit is deformed together with the filled elastic member, so that proper crowning can be performed.

In the press brake according to the sixth aspect of the present invention, when the upper table and the lower table are relatively moved to perform the processing, the left and right slits are provided horizontally from the ends of the upper table or the lower table. Since the fitted elastic member is compressed and deformed to perform crowning, uniform bending can be performed with high accuracy by using a low-cost device.

In the press brake according to the seventh aspect of the present invention, when the upper table and the lower table are relatively moved to perform the processing, the urethane inserted into the left and right slits provided in the upper table or the lower table. Is compressed and deformed, so that proper crowning can be performed.

In the press brake according to the eighth aspect of the present invention, when the upper table and the lower table are relatively moved to perform processing, the springs fitted in the left and right slits provided in the upper table or the lower table. Is bent, so that proper crowning can be performed.

In the press brake according to the ninth aspect of the present invention, when the upper table and the lower table are relatively moved to perform the processing, the press table is brought into contact with the stopper within the range of the slit interval adjusted by the interval adjusting means. As the upper table or lower table is deformed,
Appropriate crowning can be performed by preventing excessive deformation.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a press brake according to the present invention.

FIG. 2 is a front view showing a slit and a spring for explaining the function and effect of the slit of FIG. 1;

FIG. 3 is a perspective view showing another embodiment of the press brake according to the present invention.

FIG. 4A is an exploded view of an elastic member such as urethane inserted into a slit, and FIG. 4B is an end view.

FIG. 5 is an enlarged view of a main part showing a distance adjusting means and a stopper.

FIG. 6 is a front view illustrating a problem in a conventional press brake.

FIG. 7 is a perspective view showing a lower table of a triple structure in a conventional press brake.

FIG. 8 is a partially omitted front view showing an example in which a slit and an adjustment top are provided on a lower table in a conventional press brake.

FIG. 9 is a front view showing a lower table that is excessively bent due to the shape of a slit in a conventional press brake.

[Explanation of symbols]

 1, 23 Press brake 5U Upper table 5L Lower table 9U Upper die 9L Lower die W Work 11L, 11R, 25L, 25R Slit 11A First slit 11B Second slit 11C Third slit 13 Start end 15 End 29 Urethane (elastic member) 31U , 31L lid 33 case 35 bolt (space adjustment means) 37 stopper

Claims (9)

[Claims] 1. A press brake for bending a work in cooperation with an upper die and a lower die by moving an upper table and a lower table relatively up and down, wherein slits are formed on both left and right sides of the upper table or the lower table. A first slit extending obliquely upward and outward from a starting end provided at the center of the upper table or the lower table slightly outward, and a second vertically extending downward from the first slit. A press brake, comprising: a slit; and a third slit extending obliquely upward from the second slit toward an end provided near a lower center of the upper table or the lower table. 2. The press brake according to claim 1, wherein a horizontal distance from the starting end to the second slit is substantially twice a horizontal distance from the end to the second slit. 3. The press brake according to claim 1, wherein a round hole is provided at the start end and the end end. 4. The press according to claim 1, wherein a connecting portion between the first slit and the second slit and a connecting portion between the second slit and the third slit are smooth. brake. 5. The press brake according to claim 1, wherein an elastic member is filled in the slit. 6. A press brake for bending a workpiece by cooperation of an upper die and a lower die by moving an upper table and a lower table relatively up and down. A press brake, comprising: a slit provided substantially horizontally to both ends, and an elastic member fitted into the slit. 7. The press brake according to claim 6, wherein the elastic member is urethane, and a case for storing the urethane, and a lid for sandwiching the urethane from above and below are provided. 8. The elastic member is a spring,
The press brake according to claim 6, wherein: 9. A stopper for preventing the lower table or the upper table from flexing by a predetermined amount or more inside the slits at left and right ends of the upper table or the lower table, and a distance adjusting means for adjusting a distance between the slits. 9. The method according to claim 6, further comprising the steps of:
Press brake according to any of the above.