JP3647020B2 - Bend blade threading correction device for sheet metal bending machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bending correction device for a bend blade in a bending machine for a plate material that is bent by a bend blade in a state where a plate material such as a sheet metal is held by an upper die on a lower mold.
[0002]
[Prior art]
There are various types of sheet metal bending machines, but in this type of sheet metal bending machine with bend blades, forward bending to bend the sheet metal sandwiched between the upper and lower molds and reverse bending to be bent downward is performed. In doing so, the blade applies not only a vertical force but also a lateral force to the plate material, accompanied by elastic deformation of the main body frame (but if the main body frame is difficult to deform and rigid) This increases the cost) and tends to cause a curved distortion that slightly escapes forward in the mold. If the sheet metal is bent in this state, the bending becomes insufficient as it goes to the center, and the bending becomes a non-uniform product. It was corrected by adding deformation to it, and it was made to bend in the corrected state.
[0003]
As the simplest means of correction, a thin piece called a shim was inserted between the blade holder and the blade for adjustment, but this caused trial and error, resulting in poor workability, and a correction amount depending on the thickness and bending length of the sheet metal. However, it is difficult to deal with each case, and this makes it difficult to switch between corrections for each type of plate material, and accuracy cannot be obtained. Therefore, a correction method controlled by a computer that easily obtains numerical data is adopted. 4 and 5 show the conventional example.
[0004]
The plate bending machine shown in both figures has a blade holder 59 in common and a drive device B1, B1 on both sides and one drive device B2 between them, and each drive device has a horizontal driving arm 63 and The vertical axis driving arm 64 is moved by the crank mechanisms 67 and 69, respectively, and drives the blade holder 59 as a combination of the movements. For driving the three horizontal axis driving arms 63, 63, 63 in parallel, One crankshaft 71 rotated by one servomotor 70 was provided. As for the blade passage correction device, the individual crank mechanisms 60, 60, 60 with the servo motor 74 are interposed between the horizontal axis driving arm 63 and the blade holder 59 for each of the driving devices B1, B1, B2. As a result, the center and the both ends of the blade holder 59 are made relatively different from each other, the blade holder 59 is curved as shown in FIG. 4, and the blade 53 is corrected for curvature.
[0005]
[Problems to be solved by the invention]
The plate bending machine shown in FIG. 5 shows a case in which the blade holder 59 is integrally supported by the longitudinal axis driving arm 64. In this case, however, unlike the illustration, a correction device is temporarily installed. If not provided, even if the horizontal axis driving arm 63 is directly pin-connected to the blade holder 59, a link mechanism is formed, and the blade 53 can be moved as desired by combining the vertical and horizontal axes. However, as described above, since the unstable crank mechanism 60 that breaks the link mechanism is interposed as the correction device, it is necessary to support the crank mechanism 60 as a part of the horizontal axis. A shaft slider 64 was provided, and a crank mechanism 60 was provided thereon. Further, it is necessary to move the blade holder 59 up and down without being restricted by the regulation. For this reason, it is necessary to interpose the vertical slide block 72 by the LM guide between the eccentric shaft 68 of the crank mechanism 60 and the blade holder 59. As a result, the number of parts became very large, which was not suitable for cost reduction.
[0006]
In addition, the amount of absorption of force or dimension between these many parts cannot be ignored in bending. In addition, since the dimension L between the eccentric shaft of the crank mechanism 67 that drives the horizontal axis driving arm 63 continuously with the parts and the dies 55 and 56 becomes very long and the rigidity becomes so small, the bending by the blade 53 is reduced. The reaction force against this force is easily absorbed by the main body frame 51, the amount of change in the dimension L is large, and such complicated elements are added, making it difficult to control the computer numerically, and bending due to lack of rigidity There was also a problem that no processing was obtained.
[0007]
In view of the above circumstances, an object of the present invention is to provide a bend blade threading correction device in a plate bending machine in which the number of parts is extremely small and correction is accurate.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a bending machine for a plate material in which the plate material is fastened to the lower die by the upper die and bent by the bend blade, and the bend blade is attached to one common blade holder, The blade holder includes at least three or more individual driving devices arranged in parallel, and the individual driving device includes a horizontal shaft driving member 13 and a vertical shaft driving member 14 which are directly connected to the blade holder by a connecting means. The eccentric shaft of the crank mechanism that drives 13 is independently controlled by separate servo motors 24 so that the central portion of the bend blade protrudes toward the insertion port 2 side of the plate material W according to the deformation of the blade holder. Corrected .
As a means for connecting the horizontal axis driving member and the blade holder, a vertical guide rail may be attached to one of them, and a guide block engaging with it may be attached to the other .
[0009]
With the configuration described above, if an example of the correction procedure is presented, the eccentric shaft of the crank mechanism that drives the horizontal shaft driving member is relatively moved forward with respect to the intermediate individual drive device among the parallel individual drive devices. Set the position and take the posture to bend as a curved shape that projects the blade to the center together with the blade holder. Further, numerical data is accumulated by recording this consistency in a computer, and an accurate set amount for each product type can be obtained based on the numerical data. Further, since no correcting means is provided in the middle of the horizontal axis, the number of parts is remarkably reduced, thereby reducing the correction amount and making the correction accurate.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In this invention, since the horizontal shaft driving member 13 is directly connected to the blade holder 9 (FIG. 2), the number of parts is greatly reduced in accordance with the total number of parallel drive units A1, A1, A2,. (FIG. 1). Moreover, on the horizontal axis, there is almost no change in the dimension from the eccentric shaft 25 as the driving source to the blade 3, while in the main body frame 1, the dimension M from the eccentric shaft 25 to the dies 5 and 6 is greatly reduced. Since the rigidity is given and the deformation amount of the main body frame 1 is reduced, the correction amount is reduced as a result, the unstable elements are reduced, and the correction by the control of the computer becomes accurate.
[0011]
As a means for direct connection, the horizontal shaft driving member 13 may be pin-connected to the blade holder 9. Since the link mechanism is thus configured and the movement of the horizontal axis driving member 13 and the vertical axis driving member 14 can be combined as the movement of the blade 3, in the same sense, the horizontal axis driving member 13 is replaced by the vertical axis driving member 14. Even if it is the structure which pin-connected to the upper end of this, it shall not be contrary to the meaning of this invention.
[0012]
However, as described in claim 2, when a so-called LM guide connection structure is used, the horizontal axis driving member 13 can be formed into a very short block shape as shown in FIG. However, the vertical movement associated with the driving of the crank mechanism 17 is allowed, and since it is not necessary to use a long arm, the dimension M is significantly reduced. In addition, since the vertical movement of the blade holder 9 accompanying the drive of the vertical axis driving member 14 can be greatly taken, the blade holder 9 is formed in a U shape and is bent inwardly as shown in the embodiment. It is also suitable for a configuration in which the blades 3 and 3 are attached up and down so that they can be bent in reverse. In the conventional example, the blade holder 59 is U-shaped (FIG. 5). However, there is a disadvantage that the blade holder 59 becomes unstable when it is enlarged up and down, but in this invention, the horizontal axis driving member 13 directly supports the blade holder 9. To improve stability.
[0013]
【The invention's effect】
As described above, according to the present invention, since the number of parts is extremely small, it is suitable for providing an inexpensive plate bending machine, and the number of parts from the drive source to the bend blade is about the vertical axis. In addition to being small, since the distance from the drive source to the mold is reduced, not only the correction amount is small and the correction is accurate, but also because it can be bent, it is suitable for bending as a good product There is an effect.
[0014]
【Example】
Next, an embodiment of the present invention will be specifically described with reference to FIGS.
[0015]
The plate bending machine has an insertion port 2 for a plate W at an intermediate portion of a main body frame 1, and a bending drive device A by a bend blade 3 is provided below the main body frame 1. The bend blade 3 bends the plate material W by the driving device A in a state where the plate material W is sandwiched and fixed by the molds 5 and 6 (FIG. 2).
[0016]
In the main body frame 1, a middle frame 8 is erected in the middle between both side frames 7, 7 made of steel plates (FIG. 2), and the individual drive devices A1, A1 for the frames 7, 7, 8 respectively. , A2 and the drive device A is constituted by an arrangement of these three individual drive devices A1, A1, A2 that share the blade holder 9 (FIG. 1).
[0017]
The individual driving devices A1, A1, and A2 are configured such that the blade holder 9 is driven as a combination of movements of the horizontal axis driving member 13 and the vertical axis driving member 14 (FIG. 2). The vertical axis driving member 14 is operated by crank mechanisms 17 and 18, respectively. Among the crank mechanisms 17 and 18, the crank mechanism 18 that drives the vertical axis driving member 14 is driven by one servomotor 22 with the crankshaft 20 in common (FIG. 2), but the horizontal axis driving member 13. Is provided with servomotors 24, 24, 24 for each of the individual drive devices A1, A1, A2, that is, for each of the horizontal shaft drive members 13, 13, 13 (FIG. 1).
[0018]
As shown in FIG. 3, the crank mechanism 17 that drives the horizontal shaft driving member 13 is welded to the main body frame 1, that is, by attaching a pair of steel plates to the side frame walls 7 or the middle frame walls 8. Bearing portions 23 and 23 are formed, and the crankshaft 21 is supported by the bearing portions 23 and 23 via bearings 22 and 22. The crankshaft 21 is formed with an eccentric shaft 25 as a crankpin between the bearing portions 23, 23, and the horizontal shaft driving member 13 is pivotally supported on the eccentric shaft 25 via a bearing 27.
[0019]
The blade holder 9 has a U-shaped cross-sectional shape, and includes a bend blade 3 that bends forward at the lower end and a bend blade 3 that reversely bends at the upper end. And it is formed in a large U shape so that both normal bending and reverse bending can be performed inside the U shape. Therefore, since it is necessary to take a large vertical fluctuation, the so-called LM guide method is adopted for the connecting means 28 with the horizontal shaft driving member 13, the guide rail 29 is provided on the blade holder 9, and the vertical shaft driving member 13 is provided with a vertical guide. Blocks 31, 31 are attached.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram viewed from a plane schematically showing a bend blade threading correction device in a plate bending machine according to the present invention;
FIG. 2 is a sectional view seen from the side of a plate bending machine showing the main part of the present invention.
FIG. 3 is a cross-sectional view seen from a plane showing a horizontal axis drive source in a plate bending machine according to the present invention.
FIG. 4 is an explanatory view schematically showing a conventional example viewed from a plane corresponding to FIG.
FIG. 5 is an explanatory diagram corresponding to FIG. 2 and showing a conventional example.
[Explanation of symbols]
A Bend blade drive device A1, A2 Individual drive device W Plate material 3 Bend blade 5 Upper die 6 Lower die 9 Blade holder 13 Horizontal shaft driving member 14 Vertical shaft driving member 17 Crank mechanism 24 Servo motor 25 Eccentric shaft 28 Connecting means 29 Guide rail 31 Guide block

Claims (2)

In a plate bending machine that uses a bend blade to fasten a plate with a lower mold and bend it with a bend blade ,
A bend blade is attached to one common blade holder ,
At least three or more individual drive devices are arranged in parallel on the blade holder, and the individual drive device includes a horizontal shaft driving member (13) and a vertical shaft driving member (14) directly connected to the blade holder by a connecting means, The eccentric shaft of the crank mechanism that drives the horizontal shaft driving member (13) is independently controlled by a separate servo motor (24), and the central portion of the bend blade is made of the plate material (W) according to the deformation of the blade holder. A bending machine for a plate material with a bend blade threading correction device, wherein the bending shape is corrected to a curved shape projecting toward the insertion port (2) .   2. The plate bending machine according to claim 1, wherein a guide rail of the vertical axis is attached to one side as a connecting means between the horizontal axis driving member and the blade holder, and a guide block to be engaged with the other is attached to the other side.

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