JPS6320415Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for adjusting the end point height of a bending pressurizing section, and more specifically, it positions a plate-shaped workpiece on the lower mold, brings the upper mold close to the lower mold, and In a folding machine that crimps a plate-shaped workpiece between the upper die and bends the sides of the plate-shaped workpiece using an elevating die, the elevating die approaches the upper die by ascending diagonally in a specific trajectory. This invention relates to a device that changes and adjusts the height of the end point of a pressing section that presses and bends a workpiece.

First, the background of this invention is shown in Figure 1.
This will be explained based on FIG.

The bending machine 1 shown in FIG. Pressure cylinder 7
An upper frame 9 is provided which is driven to move up and down.

An upper mold 13 is attached to the lower surface of the upper frame 9 via an upper mold holder 11, and a lower mold 5 is attached to the lower surface of the upper frame 9.
The plate-like workpiece 15 positioned above the upper mold 13
is crimped between the upper mold 13 and the lower mold 5, and the lifting mold 17 moves the upper mold 13 diagonally from below in a specific trajectory on the side of the plate-like workpiece 15 that overhangs the upper mold 13 and the lower mold 5.
The plate-shaped workpiece 15 is bent by ascending upward and approaching it.

In this type of bending machine 1, even if the thickness of the plate-shaped workpiece 15 to be pressed changes, the final distance at which the pressing part 19 of the elevating mold 17 approaches the upper mold 13 remains constant.

Therefore, if the lifting limit position of the lifting mold 17 is set at a high position relative to the thick plate-like workpiece 15 and at a low position relative to the thin plate-like workpiece 15,
When the plate-like workpiece 15 is thick, the tip 2 closest to the lifting die 17 at the lower end of the upper die 13, which is the center of bending.
The upper end 2 of the lifting mold 17 is located at a relatively distant position from 1.
When the plate-shaped workpiece 15 is thin, the upper die 13 becomes the center of bending.
The upper end 23 of the elevating mold 17 comes into contact with a position relatively close to the tip 21 of the mold 17, and the bending operation begins.

Therefore, by accurately changing the lifting limit of the lifting mold 17 up and down depending on the thickness of the plate-like workpiece 15, even a thick plate-like workpiece 15 can be subjected to a relatively small bending moment. Thin plate work 1
This means that the bending work can be performed with a bending moment comparable to that of 5.

The present invention is a device for adjusting the end point height of a bending and pressing section, which is implemented based on the above-mentioned rationale, and preferred embodiments thereof will be described in detail below with reference to the drawings.

In FIGS. 3 and 4, the elevating mold 17, which is long in the direction of the bending line, is connected to the machine frame 3 by an eccentric shaft 27 near the upper end of a piston rod 25 of a drive device such as a plurality of hydraulic cylinders (not shown). It is fixed to the upper end surface of a lifting platform 29 that is guided to move up and down by clamp claws 31 and 33 that are perpendicular to the bending line.

A sprocket 35 is fixed to the eccentric shaft end of the eccentric shaft 27 described above, and an idle sprocket 37 is located on the same plane as the sprocket 35 provided on the eccentric shaft 27 on the center side of the lifting platform 29 in the direction of the bending line. It is rotatably provided.

The above-mentioned idle sprocket 3 of the lifting platform 29
A twin piston rod fluid pressure cylinder 39 is provided adjacent to the position where piston rods 41 and 7 are provided.
A chain 43 having both ends pivoted to the sprocket 41 is provided so as to extend around the sprocket 35 and the idle sprocket 37.

Further, a dog 45 is provided in a part of the chain 43 described above, and a lifting platform 29 corresponding to the movement position of the dog 45 is provided.
Detectors 47 such as micro-switches are provided on the side surfaces of the plate-shaped workpiece 15 for each thickness of the plate-shaped workpiece 15 to be bent.

Since the apparatus according to the embodiment of the present invention is constructed as described above, the eccentric shaft 27 provided near the upper end of the piston rods 25 of the plurality of fluid pressure cylinders is connected to the chain 43 by the fluid pressure cylinder 39 of the twin piston rods. If the amount of eccentricity of the eccentric shaft 21 is α, the upper limit of the lift mold 17 can be accurately displaced up and down by α around the upper limit position of the lifting hydraulic cylinder. Become.

Thus, as described above, when bending a thick plate-shaped workpiece 15, the lifting limit of the lifting die 17 is set high, and when the plate is thin, the lifting limit is set low, and the lifting die 17 is moved to the upper die according to a specific trajectory. On the other hand, in the process of obliquely ascending and approaching, it was possible to reduce the degree to which the moment for bending the plate-like workpiece 15 is influenced by the size of the plate thickness.

That is, since it is equipped with a remotely controlled twin piston rod hydraulic cylinder 39 and a detector 47 that detects the movement position of the chain 43 for each plate thickness, it is easy to set the rotation angle of the eccentric shaft to a desired angle.
This made it possible to adjust the end point height of the lifting-type pressure section with high precision.

In addition to the example shown, a combination of a worm gear and a worm wheel can be used as a means for rotating the eccentric shaft, and the height of elevation of a dog provided in a part of the elevating type can be directly detected by a detection device such as a micro switch. It is also possible to control the hydraulic cylinder for lifting/lowering drive.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the background of the invention, Fig. 2 is an explanatory diagram of the area around the ascending/descending type, Fig. 3 is a sectional view at the center of the eccentric shaft of an embodiment of the invention, Fig. 4 is a front view of one end of the present invention around the eccentric axis. Explanation of symbols representing main parts of the drawings, 1...Bending machine, 15...Plate workpiece, 17...Elevating type, 1
9... Pressure section, 27... Eccentric shaft, 47... Detector.

Claims (1)

[Claims for Utility Model Registration] A plate-like workpiece is positioned on a lower die, an upper die is brought close to the lower die, the plate-like workpiece is crimped between the lower die, and the plate-like workpiece is moved by an elevating die. A folding machine for folding sides, characterized in that an eccentric shaft is provided for connecting an elevating type and a piston rod of a fluid pressure cylinder that raises and lowers the elevating type, and a rotating device is provided for rotating the eccentric shaft. End point height adjustment device for bending pressure section. The end point height adjustment of the bending pressurizing part as set forth in claim 1 of the utility model registration claim, characterized in that a rotating device for rotating an eccentric shaft includes a piston rod at both ends, a chain, and a sprocket. Device. Utility model registration claim 1, characterized in that a rotating device for rotating an eccentric shaft is provided by engaging a pair of a worm gear and a worm wheel.
The device for adjusting the end point height of the bending pressure section described in section 1.