JPS6152936A - Bending work device for plate material - Google Patents

Abstract

PURPOSE:To eliminate the damage on the surface of a plate material at the bending work time by providing a clamp and swivelling member on a vertically movable frame and by motioning the swivelling member so as to slide on the upper face of the plate material with clamping the plate material on the lower die at the descending position of the frame. CONSTITUTION:The plate material 16 which is placed on the lower die 20 of a backing base 19 is pressed by a clamp 18 with descending a frame 3 by the piston rod 2 of a lifting device. When a blade 14 starts a swivelling motion in the arrow mark 27 direction by a shaft 13 via the output shaft 9 of a speed reducer 7 and driving gears 11, 12 with starting the driving of a motor 6, a presser member 17 bends the plate material 16 with pushing with the part 20a of the lower die 20 as a fulcrum. The member 17 is swivelled with sliding on the upper face of the plate material 16 and after the necessary bend angle being given to the plate material 16 the blade 14 is returned with reverse revolution and the frame 3 is returned to the ascending position as well. The damage of the surface of the plate material by dusts at the bending work time and the unnecessary deformation of a work to be caused after bending work are thus eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a bending device for plate materials that presses and bends a plate material using a rotating member around a fixed shape as a fulcrum.

[Technical background of the invention]

This type of bending machine for plate materials is used when forming the outer box of home appliances from the metal plate side, and clamps the plate material sent from the previous process station to the top surface of a flat pedestal. In this state, the plate material is pushed using a rotating member (referred to as a wing among those skilled in the art) that is provided to rotate around a horizontal axis so that the square mold part is a fulcrum. There are some that have a structure that allows them to be bent.

[Problems with background technology]

However, since the above-mentioned conventional device bends the plate material in a vertical direction, the upper surface side of the rotating member (the part that is the upper surface in the return state before turning) slides against the lower surface of the plate material. It will be pressed and bent. in this case,
In particular, if the plate material has been surface-treated in advance, such as a so-called colored steel plate, it is necessary to bend the plate with the outer decorative surface facing downward in the product state. The sides will slide. However, since the swivel member is exposed to the atmosphere at all times, not only when the operation is stopped, the top surface of the swivel member is easily covered with dust from the workplace. It could slide on the decorative surface of the board and cause scratches on it.

In addition, since the plate material is bent so that it stands up, the rising part due to this bending process tends to flex significantly in the direction of falling down due to its own weight, resulting in deformation such as a change in the bending angle during transportation to the next process station. There were also problems.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bending device for plate materials that can prevent damage such as scratches caused by dust to the surface of a plate material during the bending process, as well as prevent unnecessary deformation of the workpiece after the bending process. .

[Summary of the invention]

The device according to the present invention is provided with a rotating member together with a clamp on a separate frame that is raised and lowered by an elevating device, and the rotating member is held by the clamp while holding a plate material on the upper surface of the lower mold installed below at the lowering position of the open frame. The structure is such that the upper surface of the plate material is pushed downward by the rotating movement, and as a result, the part of the rotating member that slides on the plate material is on the non-upper surface side where dust is less likely to adhere. It is possible to prevent damage to the plate material as much as possible.

[The fruit of invention Lf! i example]

First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. Reference numeral 1 denotes a hydraulic cylinder constituting an elevating device, which is fixedly held at a suitable height position and connected to the lower end of the piston rod 2 via a connecting beam 4 so that a machine frame 3 can raise and lower it. has been done. An electric motor 16 is installed as a rotary drive device on a platform 5 that projects horizontally from the upper end of the threshold frame 3, and drives an input shaft 8 of a reduction gear 7 arranged below the electric motor 16.

The output shafts 9, 9 of the reducer 7 extend horizontally from side to side and pass through the side plate portions 10, 10 of the machine frame 3 via bearings (not shown), and drive gears 11 are attached to both of the protruding ends thereof. It is being These driving gears 11 and two driven gears 12 meshing with each other at a position below the driving gears 11 are connected to a rotating shaft 13.13 that passes through the side plate portion 10.10 of the machine frame 3 via appropriate bearings. Rotating shaft 13.
Both ends of a long wing plate 14 are horizontally connected to the inner end of the frame 3 of 13 via an arm 15. This allows the vane 14 to pivot around the horizontal axis. A suppressing member 17, which is a rotating member that presses and bends a workpiece such as a colored plate 16 while sliding thereon, is fixed to the lower surface of the wing plate 14 by bolting means or the like. Further, a thick plate-shaped clamp 18 is integrally fixed to the lowermost edge of the machine frame 3 in a horizontal state. This clamp 18 is used for suppressing member 17 when its lower surface is in a horizontal state.
It is set so that it is flush with the bottom surface of the. On the other hand, a suitable pedestal is installed below the lifting space of the machine frame 3, and a lower mold 20 having a slightly rounded tip as a mold part 20a is fixed to the upper surface side of the pedestal.

FIG. 3 shows a control device u21 for the electric motor 6,
Reference numeral 22 denotes a rotation detector which is attached to the electric motor 6 and configured to generate one pulse per rotation for each predetermined angle of rotation, and 23 a counting circuit which counts pulses from the rotation detector 22. This is a rotation amount data generator consisting of: 2
Reference numeral 4 denotes a bending angle setting section for the plate material, which is provided with a large number of bending angle data according to the plate pressure, material, etc. of the plate material 16, and can be set using a selection member 25 such as a dial. It has become. 26 is a data comparison function and electric motor 6
This is a control unit that has multiple motor control functions including starting, stopping, and switching the direction of rotation.

Next, the operation of the above configuration will be explained. The plate material 16, which is a workpiece, is transported from the previous process station with the decorative surface facing downward, with the machine frame 3 held in the raised position by the hydraulic cylinder 1. placed on the top surface.

In this state, screw 1 of hydraulic cylinder 1 and rod 2
As a result, the machine frame 3 is lowered, and the clamp 18 holds the plate material 16 by pressing it against the upper surface of the lower mold 20, and the lower surface of the suppressing member 17 comes into contact with the plate material 16. In this state, the electric motor 6 starts driving. Then the driven gear 12.1
2 is the electric motor 6 to the reducer 7. Because it rotates by receiving rotational force through its output shaft 9.9 and drive gear 11.11,
The N plate 14 begins to pivot by means of the shaft 13.13 in the direction of the arrow 27 in FIG. Due to this turning operation, the pressing member 17 presses and bends the plate material 16 using the mold part 20a of the lower die 20 as a fulcrum, sliding on the upper surface of the plate material 16 and pivoting downward to the position shown by the two-dot chain line in FIG. is the mold part 2 of the lower mold 20.
A bending angle θ is given at the portion 0a. After the plate material 16 is bent downward in this way, the wing plate 14 is rotated back in the direction opposite to the arrow 27 by the reverse rotation of the electric motor 6,
Subsequently, the machine frame 3 is raised by the hydraulic cylinder 1, and the plate material 16 is transported to the next process station in its bent state.

In this device having the above-mentioned functions, the plate material 16 is held on the lower mold 20 with the decorative surface facing upward.
is bent downward by the pressing member 17 so that when it becomes a box product, the decorative surface will be on the outside, so the pressing member 1
The surface driven by 7 becomes the decorative surface. However, the surface of the pressing member 17 that slides on this decorative surface is limited to the non-upper surface side, that is, in this embodiment, the lower surface and various parts on the lower surface side of the tip thereof, and this part is more susceptible to dust settling in the air than the upper surface side. Since the receiving part is a difficult part and there is very little dust adhering to it, it is possible to prevent the decorative surface of the plate material 16 from being damaged by dust such as being scratched during the 18th rounding process.

In addition, since the plate material 16 is bent downward, the bent and hanging portion will not bend in the direction of collapse due to its own weight, and therefore the bending angle will not change during transportation to the next process station. In addition to being able to prevent unnecessary deformation, the surface that slides during transportation to the next process station is the inner surface of the plate material 16, so there is no need for special consideration, etc., which facilitates rapid transportation and simplification of the transportation device. It is valid.

Furthermore, in the case of punching presses for sheet materials, the press work is often performed with the decorative side facing upward, but if the pre-processing station of this equipment is used for such punching press work, it is difficult to Although the device requires an extra step of turning the plate over at this bending station so that the decorative surface is on the lower side, the present device does not require such a step.

Next, a second embodiment of the present invention will be described with reference to FIG. 4, in which the same parts as in FIG. 1 are denoted by the same reference numerals. A plurality of compressed air-driven rotary actuators 28, 29, for example, two rotary actuators 28, 29, are installed on the side plate 10, 10 of the machine frame 3 as rotary drive devices.
．． 291M1 are connected by a shaft 30 to connect both drive gears 11.
11 can be rotated integrally.

In addition, although only one bending device is shown in the above embodiment, it is possible to arrange two of these devices on the left and right sides (as shown in FIG. 2) to create a facility configuration that bends both ends of the plate material at the same time. 4 units are placed in the area, and the inner 2 units are used for small bending intervals, and the outer 2 units are used for large bending intervals.
It is also possible to configure the equipment using a stand.

(Effects of the Invention) As described above, according to the present invention, it is possible to prevent the surface of the plate material from being damaged by dust during bending and to prevent excessive deformation of the workpiece after bending. A bending device can be provided.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention,
Fig. 1 is a front view, Fig. 2 is a vertical side view taken along the line ■-■ in Fig. 1, Fig. 3 is a block diagram of the control device, and Fig. 4 is a second embodiment of the present invention. FIG. 1 is a diagram corresponding to FIG. In the figure, 1 is a hydraulic cylinder (elevating device), 3 is a threshold frame, 6 is an electric motor (rotary drive device), 7 is a reduction gear, 11 is a drive gear, 12 is a driven gear, 14 is a blade plate, 16 is a plate material, 17 is a suppressing member (swivel member), 18 is a clamp, 20 is a lower mold, 2
8.29 is a rotary actuator (rotary drive device).

Claims (1)

[Claims] 1. A lower mold, a machine frame located above the lower mold and moved up and down by a lifting device, a clamp provided on the machine frame to hold a plate on the upper surface of the lower mold in a lowered position, and the machine frame. a rotating member provided on the machine frame so as to rotate around a horizontal axis and for sliding the plate material downwardly and bending it downward while sliding the plate material at the lowered position of the machine frame; A plate bending device comprising a rotary drive device that drives a rotating member.