JPS60166123A - Plate material bending device - Google Patents

Abstract

PURPOSE:To correct flexure of a frame automatically by providing a wedge member for adjusting amount of flexure at the center of a flexible frame supporting a die and arranging gap absorbing wedge members on both sides of it. CONSTITUTION:Die fastening members 11A, 11B are arranged front and rear of upper part of a lower frame 5L of a press brake etc., and both ends are supported pivotally by shafts 13L, 13R. A flexible frame 15 is fixed between members 11A, 11B to support a lower die 9L. A fixed wedge member 17F and an adjusting wedge member 17A are provided between the frame 5L and flexible frame 15, and the wedge member 17A is moved back and forth by an automatic control driving device 19. Correction of flexure of upper and lower frames 5U, 5L at the time of working of the plate material W is performed by this mechanism. The gap between the flexible frame 15 and lower frame 5L formed at the time of correction is absorbed by automatic back and forth movement of a gap absorbing wedge member 23 operated by a cylinder 25. The load of the frame 15 is received by the frame 5L.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate bending device such as a press brake, and more particularly to a plate bending device having a function of correcting frame deflection.

In sheet material bending devices such as press brakes, bending occurs in the frame during bending of the sheet material, making it difficult to perform accurate bending. Conventionally, in order to prevent the frame from bending, The middle part of the upper and lower frames that supported the upper and lower molds was formed wide and high. However, it is extremely difficult to completely eliminate the deflection of the upper and lower frames during the bending process, so in order to further improve the bending accuracy, conventional methods have been used to correct the deflection during bending. One of the upper and lower frames is bent in advance, or one of the upper and lower molds is bent.

As mentioned above, in the case where the frame is pre-flexed, there is a problem in that the frame, which originally needs to be rigid, is easily bent and must be weakened. In addition, in the case of bending the mold, etc., -C is installed in an appropriate gap between the frame and the mold, etc.
If you had to adjust each of the cylinders or the stems separately, it would be very cumbersome to adjust each cylinder. There is a problem in that it is difficult to bend the plate material at the same position.

The present invention was invented in view of the conventional problems as described above, and it is possible to automatically compensate for the bending of the frame during the initial bending process, and in some cases, the bending device may be biased to one side of the bending device. The object of the present invention is to provide a sheet material bending device that can also be used for bending in position. Generally speaking, a flexible frame that can be bent separately from a frame that needs to be rigid is provided, and an adjustment wedge member interposed between the rigid frame and the flexible frame is provided so that it can move forward and backward automatically, and One end of the flexible frame is adjustable separately from the other end.

Referring to FIG. 1, a press brake 1 illustrated as an example of a plate bending device includes C-shaped left and right side frames 3L, 3R, and side frames 3[, 3R].
It includes an upper frame 5U and a lower frame 5L supported at the upper and lower parts of the frame.

An upper die 9U is attached to the lower part of the upper frame 5U via an appropriate number of support devices 7, and a lower die for bending the plate material W is attached to the upper part of the lower frame 5L in correspondence with the upper die 9U. 9
L is installed appropriately.

In the press brake 1 having the above configuration, the upper die 9U and the lower die 9L are engaged with each other by raising and lowering either the upper frame 5U or the lower frame 5L by an appropriate lifting drive device, and the upper die 9U and the lower die 9L are engaged with each other. The plate material W positioned between the lower mold 9L is bent.

Now, referring to FIGS. 1 to 3, the lower frame 5L
A die tightening part 11 extending in the left-right direction is provided at the front and back of the upper part
11A and 11B are arranged, each die tightening member 11A
, 11B through pivots 13L and 13R.
(A flexible frame 15 supporting the lower mold 9L is arranged between each die clamping part U11A and 11B.
Yes, each die tightening member 11A, 11B and the flexible frame 1
5 is fixed to a single surface of C by attaching it to a plurality of poles 1, etc.

As shown in FIG. 2, a fixed wedge portion +A17F is arranged between the flexible frame 15 and the lower frame 51-, which are located near the center of the lower frame 5L.
Adjustable wedge portion v that engages with fixed wedge member 17F and can move forward and backward! 1
17A is arranged, and the adjusting wedge member 17A is screwed with a screw rod 21 which is interlocked and connected to an automatic control drive device 19, such as a small motor, which is appropriately attached to one of the tie tightening members 11A. .

With the above configuration, the automatic control drive unit @19 can be
11i11titl control drive 1J'?
By this, the adjusting wedge member 17A is moved forward and backward. Therefore, by controlling the position of the adjusting wedge member 17A, the curvature of the lower mold 9L can be adjusted so that the central portion of the lower mold 9L protrudes upward through the flexible frame 15. That is, according to the above configuration, the curvature of the lower die 9L can be automatically adjusted, and the plate material W
It is possible to unmannedly correct the deflection of the upper and lower frames 5U and 5L during the bending process.

As described above, when the flexible frame 15 is appropriately bent, in order to absorb the gap that occurs between the narrow frame 15 and the lower frame 5L, first grooves are provided on both sides of the adjusting wedge member 17A. As shown in the figure, a plurality of gap absorbing wedge members 23 are arranged. More specifically, as is clear from FIG. 3, the gap absorbing wedge member 23 is the fixed wedge member 1 disposed between the flexible frame 15 and the lower frame 5L.
In the cylinder 25, which constitutes the gap absorbing wedge member 23, there is a piston rod 27 which protrudes to both sides and has both ends abutted against the die clamping parts U11A and 11B. A piston 29 is fitted.

Therefore, by appropriately supplying working fluid into one pressure chamber of the cylinder 25, the gap absorbing wedge member 23
In the figure, it moves forward and backward in the left and right directions. That is, if a gap is created between the -C flexible frame 15 and the gap absorbing wedge member 23 by bending the flexible frame 15 as described above, the gap is absorbed by the amount that absorbs the generated gap. By moving the wedge member 23 back and forth, the load applied to the flexible frame 15 can be directly received by the lower frame 5L.

Although the above embodiment has exemplified the case where the flexible frame 15 is provided on the lower frame 5L side, it is also possible to provide it on the upper frame 5U side.

Further, the direction of movement of the adjusting wedge member 17A, etc. can be set in the longitudinal direction of the lower mold 9L, and it is also possible to configure the movement of the plurality of gap absorbing wedge members 23 to be performed by a servo motor or the like. be.

However, it will be understood that the above description is merely a description of one embodiment, and that the present invention can be implemented in various ways by making various changes.

FIG. 4 and FIG. 5 show a modification of the present invention, in which eccentric portions 13E are formed at both ends of one pivot 13R, and the eccentric portions 13E are fitted into the long holes of the die clamping members 11A and 11B. It is a combination of A worm 33 meshed with a worm gear 31 integrally attached to the eccentric portion 13E is operatively connected to a rotary drive device 35 such as a servo motor, which is appropriately attached to the die clamping member 11A111B so as to be swingable. It is.

With the above configuration, the pivot shaft 13R is rotated by appropriately rotating the rotation drive device 35. Therefore, the die clamping member 11 supported on the eccentric portion 13E
One end of A and 11B can be adjusted in position up and down with respect to the other end.

In other words, when adjusting the curvature of the lower mold 9L, the lower mold 9
The inclination of the lower mold 9L can also be adjusted so that one end of L is higher or lower than the other end, and even when bending the plate material W at a position that is appropriately biased toward the negative side of the bending device. This will be possible.

As can be understood from the above description of the embodiments, according to the present invention, when bending a plate material, the curvature of the mold is automatically adjusted to compensate for the deflection of the frame of the bending device, etc. In addition, it can be easily adjusted even when the bending device is biased toward one side of the bending device.

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

[Brief explanation of the drawing]

FIG. 1 is a front view of a folding device according to an embodiment of the present invention;
2 and 3 are enlarged cross-sectional views C' taken along lines 1--2 and 1--2 in FIG. 1. FIG. 4 is a front view of main parts showing another embodiment, and FIG. 5 is an enlarged sectional view taken along the line ■-■ in FIG. 4. 1... Bending device, 5U, 5 [... Upper and lower frames 15... Flexible frame, 17Δ... Adjustment wedge member,
23...Gap absorbing wedge member, 13shi, 13r (...Axis agent Patent attorney Tamotsu Miyoshi Younger brother 1 Fig. 2 Fig. 3 Fig. 1

Claims (4)

[Claims] (1) At least one of the upper frame or the lower frame of the plate bending device is provided with a flexible frame that supports the mold, supporting both ends of the frame, and a flexible frame that supports the mold is installed near the center of the upper or lower frame. An adjustable horizontal member that can freely adjust the amount of deflection of the flexible frame is provided so as to be able to move forward and backward, and an appropriate number of gap-absorbing members that absorb the gap between the frame and the flexible frame are arranged on both sides of the adjustable horizontal part H. A sheet material bending device that is characterized by the following features: (2) The plate material folding device according to claim 1, wherein at least one end of the flexible claim is supported by a frame so as to be individually adjustable with respect to the other end. (3) The plate material bending device according to claim 1, wherein at least one end of the movable frame is pivotally connected to the frame via an eccentric shaft. (4) The plate material bending device according to claim 1, wherein the gap absorbing wedge part is composed of a cylinder that can move forward and backward.