JPH087933Y2 - Folding machine - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a bending machine, and more specifically, enables bending at a uniform bending angle over the entire width of a work. Regarding folding machines.

(Prior Art) Generally, for example, a press shaker as a bending machine. When a work is bent with a key, the upper mold and the lower mold tend to bend so that they are separated from each other, and the upper mold warps upward and the lower mold warps downward. The bent work W has a boat shape, which is a so-called "drip", as shown in FIG. 6, for example. That is, the sixth
In the figure, the distance B near the center is larger than the distances A and C at the upper edge of the work W near both ends in the longitudinal direction of the bending line L, and the angle between both sides of the bent work W is B. The portion of is larger than the portions of A and C.

Therefore, in order to solve the "drip" phenomenon as described above, conventionally, as disclosed in JP-A-60-133923, between the frame and the upper mold or the lower mold,
There may be multiple wedge mechanisms of various configurations, or
As shown in Japanese Laid-Open Patent Publication No. 52-5464, a plurality of hydraulic cylinders are arranged in parallel with a frame, and the upper die or the lower die is pre-curved with an appropriate curvature so that a central portion thereof has a convex shape. It is known that the upper die and the lower die are parallel to each other at the time of bending and bending.

(Problems to be Solved by the Invention) In the former method, the work of appropriately bending the upper mold or the lower mold into a convex shape is performed by manually adjusting a plurality of wedge mechanisms. Therefore, when the plate thickness or width of the work is different, it has to be adjusted each time, and it takes time for the adjustment and it is difficult for an expert to do so.

Further, the latter method has a problem that the frame structure must be newly manufactured, and the structure for mounting the hydraulic cylinder is complicated and very troublesome.

[Constitution of device]

(Means for Solving the Problems) In view of the conventional problems as described above, the present invention includes a plurality of hydraulic cylinders between a frame supporting a mold and the mold, and is connected to each of the hydraulic cylinders. In a bending machine including a plurality of valves and a pressure control valve capable of controlling the pressure of each of the hydraulic cylinders, an input device for inputting a processing condition of a width, a plate thickness and a material of a work into a control unit, From the input device, a data memory in which data on how much the mold is displaced in a convex shape corresponding to processing conditions is recorded, and the control unit capable of controlling each of the valves and the pressure control valve are provided. When the processing conditions are input to the control unit, the data matching the processing conditions is read from the data memory based on the processing conditions to control the ON / OFF of each valve and the pressure of each hydraulic cylinder. It will be configured as.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 2, a folding machine 1 such as a press brake includes a lower frame 5 and an upper frame 7 at the lower and upper portions of the side frames 3R and 3L, respectively. A lower mold 9 is supported on the lower frame 5, and
An upper mold 11 having the same length is supported at the lower part of the upper frame 7 so as to face the lower mold 9. The folding machine 1 moves at least one of the lower frame 5 and the upper frame 7 up and down. In this embodiment, the upper frame is actuated by the operation of hydraulic cylinders 13R and 13L provided above the side frames 3R and 3L. 7 is shown in the example of being moved up and down. Therefore, the upper frame 7 is a ram and the upper mold is
11 is a movable mold.

With the above configuration, the work to be bent is processed by the lower die 9
Place it on top, operate the hydraulic cylinders 13R, 13L, move the upper frame (ram) 7 up and down, and bend it into a work by the cooperation of the lower mold 9 and the upper mold (movable mold) 11. Processing will be performed.

Between the lower part of the upper frame 7 and the upper mold 11, a plurality of, for example, seven intermediate plates 15 (15A, 15B, 15B, 15B, 15B, 15B,
…, 15G) is interposed. More specifically, the intermediate plate 15 (15A, 15B, ..., 15G) is, as shown in FIG. 1, an upper mounting portion 17 that is mounted on the lower portion of the upper frame 7.
And a lower mounting portion 19 that is mounted on the upper part of the upper mold 11. The upper and lower mounting portions 17 and 19 are supported by the upper frame 7 and the upper mold 11 by means of ordinary mounting hardware.

The intermediate plate 15 (15A, 15B, ..., 15G) is internally provided with, for example, a hydraulic cylinder 21 as a fluid device whose position can be adjusted in a direction in which the upper and lower mounting portions 17, 19 are expanded and contracted. The upper mounting portion 17 is mounted on the upper portion of the hydraulic cylinder 21, and the lower mounting portion 19 is mounted on the lower portion of the piston rod 23 mounted on the hydraulic cylinder 21.

A cylinder chamber 25 is formed in the hydraulic cylinder 21,
By supplying hydraulic pressure to the cylinder chamber 25, the piston rod 23 is pressed downward, so that the upper mold 11 is displaced downward. Therefore, each cylinder chamber 25
If the pressure receiving areas are set to be the same, it is possible to adjust the displacement amount of the displacement in which the upper mold 11 is convex downward by adjusting the pressure of the pressure oil supplied to the cylinder chamber 25. In this way, the intermediate plate 15 (15A, 15B, ..., 15G) does not have a complicated structure such as a wedge and is simply equipped with a fluid pressure device, so that the displacement of the upper mold 11 can be performed with a simple mechanism. It can be easily adjusted.

Referring again to FIG. 2, the intermediate plates 15A and 1
5B, 15B and 15C, ..., 15F and 15G are pipes 27A, 27B, 27C,
..., connected with 6 pipes 27 of 27F, and each pipe
Valves 29A, 29B, 29C,…, 2 in the middle of 27A, 27B, 27C,…, 27F
There are 6 valves 29 on 9F.

With the above configuration, for example, if the valves 29C and 29D are closed, the cylinder chamber 2 of the hydraulic cylinder 21 which is the intermediate plate 15D.
Pressure oil is supplied to only 5 through a pipe (not shown), and the piston rod 23 is pressed downward. Also, the valve 29
If C, 29D is opened and valves 29B, 29E are closed, pressure oil is supplied to the cylinder chamber 25 of the hydraulic cylinder 21, which is the intermediate plate 15C, 15D, 15E, and each piston rod 23 is pressed downward. .

If the valves 29B, 29C, 29D, 29E are opened and the valves 29A, 29F are closed, pressure oil is supplied to the cylinder chamber 25 of the hydraulic cylinder 21, which is the intermediate plate 15B, 15C, 15D, 15E, and each piston rod 23 is lowered. Will be pushed to.

Further, when all of the valves 29, 29B, 29C, ..., 29F are opened, hydraulic pressure is supplied to the cylinder chamber 25 of the hydraulic cylinder 21, which is the intermediate plate 15A, 15B, 15C ,. Will be pushed to.

For example, as shown in FIG. 3 (A), when bending a work W having the same width L ₁ as the width of the upper die 11, all valves 29A, 29B, 29C, ... 29 is opened to supply pressure oil to the cylinder chamber 25 of the hydraulic cylinder 21, which is the intermediate plate 15A, 15B, 15C, ..., 15G, and presses each piston rod 23 to displace the upper mold 11 in a downward convex shape. By keeping
The work W can be bent by the cooperation of the upper mold 11 and the lower mold 9 and can be bent at a uniform angle over the width L ₁ .

As shown in FIG. 3B, when the work W having the width L ₂ placed on the lower die 9 is bent,
The valves 29A and 29F are closed in advance, the valves 29B to 29E are opened, pressure oil is supplied to the cylinder chamber 25 of the hydraulic cylinder 21, which is the intermediate plate 15B, 15C, ..., 15F, and the piston rods 23 are pressed to move up and down. By displacing only the work width L ₂ part of the die 11 in a downward convex shape, the work W is bent by the cooperation of the lower die 9 with the upper die 11 and the work W has a uniform angle over the width L _2. Can be folded.

As shown in FIG. 3 (C), when the work W having the width L ₃ placed on the lower die 9 is bent, the valves 29A, 29B, 29E, 29F are closed in advance and the valves are closed. 29C and 29D are opened, pressure oil is supplied to the cylinder chamber of the hydraulic cylinder 21 which is the intermediate plates 15C, 15D and 15E to press the piston rods 23 and only the work width L ₃ of the upper die 11 is projected downward. By displacing the work piece W, the work W can be bent by the cooperation of the upper mold 11 and the lower mold 9 and can be bent at a uniform angle over the width L ₃ .

As shown in FIG. 3 (D), when the work W having a width L ₄ placed on the lower die 9 is bent, all valves 29 are closed in advance to make an intermediate position. The work width of the upper die 11 is supplied by supplying pressure oil to the cylinder chamber 25 of the cylinder 21 of the plate 15D only and pressing each piston rod 23.
By displacing only the L ₄ portion in the downward convex shape, the work W can be bent by the cooperation of the upper mold 11 and the lower mold 9 and can be bent at a uniform angle over the width L _4. .

Thus, by opening and closing each valve 29 as needed according to the width of the work, the work W of various widths can be bent at a uniform angle.

FIG. 4 shows a control block diagram for controlling ON / OFF of each of the valves 29A to 29F according to the width, material and plate thickness of the work W. In FIG. 4, the control unit 31 has an input device 33 for inputting the width L of the work W, the plate thickness t, or the material.
Is also connected, and a data memory 35 for storing data on how much the upper die 11 is displaced downward in a convex shape based on various processing conditions is connected in advance.

Further, valves 29A, 29B, ..., 29F are connected to the control unit 31, and a pressure control valve 37 for controlling the pressure of each valve 29 is also connected. This pressure connection valve 37 is a cylinder chamber 23 of the hydraulic cylinder 21 which is each intermediate plate 15A to 15G.
Is provided in the middle of a hydraulic circuit for supplying pressure oil.

Therefore, processing conditions such as the width and plate thickness of the work W are input to the control unit 31 from the input device 33, and the control unit 31 receives the processing conditions.
At 31, on the basis of this processing condition, a condition for displacing the upper die 11 that matches the processing condition is selected from the data stored in the data memory 35. Then, in response to a command from the control unit 31, necessary valves among the valves 29 are turned off from the ON state, for example.
When the pressure control valve 37 is set to the state, a command is given to the pressure control valve 37 to control the pressure control valve 37, and the cylinder chamber of the required cylinder 21 of each intermediate plate 15A to 15G is controlled.
By supplying the pressure oil to 25, the bending work can be performed according to the width of the work W as shown in FIGS. 3 (A) to (D).

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. In this embodiment, the upper frame 7 is described as a ram and the upper mold 11 is described as a movable mold, but the lower frame 5 may be a ram and the lower mold 9 may be a movable mold. Also, as shown in FIG. 5, the intermediate plate 15
A, 15B, ..., 15G are individually connected to each valve 29A-29G by piping 39A-39G, and each valve 29A-29G is opened / closed by a command from the control unit 31 and individually by a pressure control valve 37. When the width L of the work W is changed,
The valves 29A to 29G are independently opened and closed for each of the intermediate plates 15A to 15G, and the respective pressures are also controlled. At that time, therefore, the work W is not placed on the lower die 9 substantially at the center,
It can be placed anywhere.

[Effect of device]

As will be understood from the above description of the embodiment, in short, the present invention provides a plurality of hydraulic cylinders between a frame supporting a mold and the mold, and a plurality of valves connected to the respective hydraulic cylinders. And a bending machine having a pressure control valve capable of controlling the pressure of each of the hydraulic cylinders, the input device (33) for inputting the processing conditions of the width, plate thickness and material of the work into the control section (31). And a data memory (35) storing data on how much the mold is displaced in a convex shape in accordance with processing conditions, and the control section (31) capable of controlling each valve and pressure control valve. When processing conditions are input to the control unit (31) from the input device (33), the data matching the processing conditions is read from the data memory (35) based on the processing conditions. ON / OFF of each valve Beauty is made of a configuration for controlling the pressure of the respective hydraulic cylinders.

As is apparent from the above configuration, in the present invention,
Input device 33 for inputting processing conditions such as work width, plate thickness, material, etc. to the control unit 31, and data memory for storing how much the mold is displaced in a convex shape corresponding to the processing conditions. 35 and a control unit 31 that can freely control each valve and pressure control valve
When the processing conditions are input from the input device 33 to the control unit 31, the data matching the processing conditions is read from the data memory 35 based on the processing conditions to turn on the valves. It is a configuration for controlling the off state and the pressure of each hydraulic cylinder.

Therefore, according to the present invention, the width of the work W, the plate thickness,
The necessary hydraulic cylinder pressure is controlled simply by inputting machining conditions such as material from the input device 33 to the control unit 31,
Since the die is displaced in a convex shape in advance in accordance with the processing conditions, it is possible to easily prevent the sagging phenomenon of the work W.

[Brief description of drawings]

FIG. 1 shows the main part of this device, and I- in FIG.
FIG. 2 is an enlarged sectional view taken along line I, FIG. 2 is a front view of a press brake of one embodiment for carrying out the present invention, and FIG. 3 is a work W.
FIG. 4 is an explanatory diagram for operating each intermediate plate when bending according to the change of the width of the plate, FIG. 4 is a control block diagram of an example for controlling the intermediate plate, FIG. 5 is a control block diagram instead of FIG.
FIG. 6 is a perspective view of a conventionally known work in a bent state. 1 …… Bending machine 7 …… Upper frame 7 …… Upper frame (movable frame) 11 …… Upper mold (movable mold) 13R, 13L …… hydraulic cylinder 15,15A,…, 15G …… hydraulic cylinder 17 ...... Upper mounting part 19 ...... Lower mounting part 21 ...... Hydraulic cylinder (fluid pressure device) 23 ...... Piston rod 25 ...... Cylinder chamber

Claims (1)

[Scope of utility model registration request] 1. A plurality of hydraulic cylinders are provided between a frame supporting a mold and the mold, and a plurality of valves connected to each of the hydraulic cylinders are provided, and the pressure of each of the hydraulic cylinders is controllable. In a bending machine equipped with a pressure control valve, an input device (33) for inputting processing conditions such as work width, plate thickness, and material to a control unit (31), and a convex mold for the mold corresponding to the processing conditions. A data memory (35) that stores data on how much to displace, and a control section (31) that can control each valve and pressure control valve, and processing conditions can be set from the input device (33). When input to the control section (31), the data corresponding to the processing condition is read from the data memory (35) based on the processing condition to turn on / off each valve and the pressure of each hydraulic cylinder. To be configured to control A fold machine according to claim.