JPH1085840A - Folding method and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically and continuously perform the correct folding by correcting the depth quantity based on the actual bending width operated from the relationship of the detected bending pressure and the bending width, and bending a work to the desired angle with the corrected depth quantity. SOLUTION: Folding is started with the depth quantity of the desired angle based on the material and thickness of the work, and the apparent work width. The depth quantity is detected by an encoder 27, and a ram 7 is stopped at the angle smaller than the preset desired value to detect the bending angle by a bending pressure detecting sensor 29. In addition, the bending angle is determined by the related file 33. The actual bending width is operated by inputting the bending pressure, the bending angle, and the material and thickness of the work in a bending width operating means 35. The depth quantity is obtained from the related file 37 so as to realize the desired angle with this bending width, and the ram 7 is driven by a servo motor 25 with the depth quantity with the correction added thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel bending method and apparatus for bending a work.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 7A and 7B, a sheet metal W having many holes
When a large number of pieces are taken, the bending width at the position a where the bending is performed is different for each product even if the outer diameter dimension is the same. The back is bent.

[0003]

By the way, in the case of a sheet metal W having no normal punched hole (or a hole whose position is determined), if the bending data is corrected by trial bending and accurate bending data is obtained, the operation is repeatedly performed by automatic operation. Can be done.

On the other hand, the depth of the sheet metal W such as the above-described conventional punched metal slightly changes because the bending width differs for each bending. As a result, there has been a problem that the entire bending process of all the products is a trial bending, and it takes a long working time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bending method and a working method for improving the working efficiency by automatically and continuously performing bending work even for a work whose actual bending width is unknown. It is to provide a device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a bending method according to the present invention according to the first aspect of the present invention provides a method for bending a workpiece whose actual bending width is unknown at a desired angle. The work is bent at a depth based on the work width of the work, the work is bent at a predetermined angle which is less than the desired angle and the work is stopped, and the bending pressure at that time is detected by a bending pressure sensor. The actual bending width is calculated from the relationship between the bending pressure and the bending width, the depth is corrected based on the calculated actual bending width, and the work is bent at a desired angle with the corrected depth. It is characterized by performing bending.

According to a second aspect of the present invention, there is provided a bending apparatus for performing a bending process on a workpiece by reciprocating a ram to relatively move a punch and a die and cooperating with the punch and the die. A bending device, a driving device for depth control for controlling the depth of a punch and a die during bending, a position detecting device for detecting a depth amount, and a bending pressure detection for detecting a bending pressure during bending. Means, depth and memory stored in advance based on the material, thickness, and apparent width of the work, and a relationship file between the bending pressure and the bending angle in which the relationship between the bending pressure and the bending angle is stored in advance. A bending calculation means for calculating a bending width, and a relation file between the bending width and the depth correction amount in which a relation between the bending width and the depth correction amount is stored. It is intended.

Therefore, when bending a workpiece for which the actual bending width is unknown to a desired angle, the workpiece is bent at a desired angle depth based on the material, plate thickness and apparent workpiece width of the workpiece. Processing starts. That is, the ram is moved by driving the drive means for depth control. The depth amount at that time is detected by the position detecting means, and the ram is stopped at an angle smaller than the desired angle specified in advance, and the bending pressure at that time is detected by the bending pressure detecting means. Further, the bending angle at that time is determined from a file related to the bending angle and the bending pressure.

The detected bending pressure, bending angle, workpiece material, plate thickness, etc. are input to a bending width calculating means, and the actual bending width is calculated. A depth correction amount is obtained from a relationship file between the bending width and the depth correction amount so that a desired angle is obtained with the calculated bending width, and the depth control driving means uses the depth amount in consideration of the depth correction amount to obtain a depth correction amount. Is moved.

[0010] Thus, it is possible to automatically and continuously bend a work whose actual bending width is unknown, thereby improving the working efficiency.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 2, for example, a press brake 1 as a bending apparatus includes left and right side frames 3 which are erected, and an upper table fixed to the front upper portion of the side frames 3. 5 is provided, and a lower table 7 as a vertically movable ram is provided at a lower portion on the front side of the side frame 3.

A punch P is provided below the upper table 5 via a plurality of punch holders 9. A die D is provided above the lower table 7 via a plurality of die holders 11. An L-shaped bracket 13 is provided on the left side frame 3 and the upper table 5.
The bracket 13 is provided with an NC device 15 as a control device.

With the above configuration, the lower table 7 is moved up and down by controlling the press brake 1 by the NC unit 15, and the work is bent by the cooperation of the punch P and the die D.

The NC unit 15 has a CPU 17 as shown in FIG. 3, and allows the CPU 17 to input various data such as work material, plate thickness, apparent work width, and depth. Input means 19 such as a keyboard and display means 21 such as a CRT are connected. A depth control servomotor 25 is connected to the CPU 17 via an amplifier 23 so as to move the lower table 7 up and down. The servo motor 25 for depth control is provided with an encoder 27 as position detecting means. Further, the CPU 17
Is connected to a bending pressure detecting sensor 29 as a bending pressure detecting means for detecting a bending pressure when the work is bent in cooperation with the punch P and the die D.

The CPU 17 is connected to a depth / memory 31 for storing a depth (D ₀ ) of a desired angle, for example, 90 degrees, based on the material, thickness and apparent width of the work input from the input means 19. I have. The CPU 17 is connected to a bending angle / bending pressure relationship / file 33 representing the relationship between the bending angle and the bending pressure as shown in FIG. A bending width calculating means 35 is connected to the CPU 17.
In 5, the bending width B is calculated by the equation of P = f (t, λ, θ, B) (where P: bending pressure, t: plate thickness, λ:
Material, θ: bending angle). Further, the CPU 17 is connected to a bending width-depth correction amount relationship file 37 representing the relationship between the bending width and the depth correction amount as shown in FIG.

FIG. 1 is a flow chart showing the operation of bending the work W having an apparent bending width b as shown in FIG. 6 to a bending position where the bending width is unknown. First, in step S1, data such as the depth (D ₀ ) at which a desired angle, for example, 90 ° bending is performed, is created based on the material, plate thickness, and the like at the apparent bending width b.

In step S2, the depth control servomotor 25 is driven to raise the lower table 7, and the encoder 27 detects the depth amount one by one and the bending pressure detection sensor 29 detects the bending pressure.
Then, as shown in FIG. 4, for example, which is stored in the file 33 in the relation between the bending angle and the bending pressure,
When the bending pressure starts to decrease, the depth control servomotor 25 is stopped. The peak point (point P _{1 in} FIG. 4) at that time is defined as a pressing force of 120 ° bending.

In step S3, the bending pressure P _{1 at} this time is set.
And detects a pressure sensor 29 bend, step S4 the detected flexural bending angle 120 ° and pressure P ₁
To be taken into the bending width calculating means 35. That is, since the bending width calculating means 35 knows P ₁ , t, λ, and θ in advance in the equation P ₁ = f (t, λ, θ, B), the actual bending width B is calculated.

In step S5, the actual bending width B obtained by the arithmetic processing is calculated using the relationship between the bending width and the depth correction amount.
As shown in FIG. 5 stored in the file 37, the depth correction amount (ΔD) based on the actual bending width B is obtained from the relationship between the bending width and the depth correction amount. In step S6, the depth amount is corrected to (D-ΔD) based on the depth correction amount (ΔD), and 90 ° bending positioning is performed.
An accurate bending process can be performed on the work W.

As described above, even when the actual bending width B is unknown, accurate bending can be automatically and continuously performed based on the apparent bending width b (outer diameter dimension), and the working efficiency is improved. Improvement can be achieved. Further, the fatigue of the worker can be reduced.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. In the example of the present embodiment, an example in which the lower table 7 is a ram has been described, but the upper table 5 may be a ram. Also, the drive means for depth control and the position detection means have been described using a servomotor and an encoder, respectively.
A pressure cylinder and a linear scale may be used. In addition, although the example has been described in which the desired angle is set to 90 degrees and the bending is stopped at 120 degrees, it is not necessary to stick to 120 degrees as long as the bending pressure is detected remarkably.

[0023]

As will be understood from the above embodiments, according to the first and second aspects of the present invention, when a workpiece having an unknown actual bending width is bent at a desired angle. Then, the bending process is started at a depth of a desired angle based on the material, the thickness of the work, and the apparent work width. That is, the ram is moved by driving the drive means for depth control. The depth amount at that time is detected by the position detecting means, the ram is stopped at an angle less than the desired angle designated in advance, and the bending pressure at that time is detected by the bending pressure detecting means. Further, the bending angle of the softwood is determined from a file related to the bending angle and the bending pressure.

The detected bending pressure, bending angle, work material, plate thickness, etc. are input to a bending width calculating means, and the actual bending width is calculated. A depth correction amount is obtained from a relationship file between the bending width and the depth correction amount so that a desired angle is obtained with the calculated bending width, and the depth control driving means uses the depth amount taking the depth correction amount into consideration. Is driven.

Thus, it is possible to automatically and continuously bend a workpiece whose actual bending width is unknown, thereby improving the working efficiency.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of a bending method according to the present invention.

FIG. 2 is a perspective view of a press brake showing an example of a bending apparatus according to the present invention.

FIG. 3 is a configuration block diagram of an NC device.

FIG. 4 is a diagram illustrating a relationship between a bending angle and a bending pressure stored in a relationship file between a bending angle and a bending pressure.

FIG. 5 is a diagram illustrating a relationship between a bending width and a depth correction amount stored in a relation file between a bending width and a depth correction amount.

FIG. 6 is a view showing an example of a work whose actual bending width is unknown.

FIGS. 7A and 7B are views showing examples of a conventional work having different bending widths when performing a bending process.

[Explanation of symbols]

 Reference Signs List 1 press brake (bending device) 7 lower table (ram) 15 NC device (control device) 17 CPU 19 input means 25 drive means for depth control (servo motor) 27 encoder (position detecting means) 29 bending pressure detecting means ( Bending pressure detecting means) 31 Depth amount / memory 33 Relationship between bending angle and bending pressure / File 35 Bending width calculating means 37 Relationship between bending width and depth correction amount / File P Punch D Die

Claims (2)

[Claims] 1. A method for bending a work having an unknown actual bending width to a desired angle, by bending the work with a depth amount based on an apparent work width, and making the work less sharp than the desired angle. Bending is stopped at the specified angle, the bending pressure at that time is detected by a bending pressure sensor, and the actual bending width is calculated from the relationship between the detected bending pressure and the bending width. A bending method, comprising: correcting the depth amount based on a width; and bending the work to a desired angle with the corrected depth amount. 2. A bending apparatus for relatively moving a punch and a die by reciprocating a ram to bend a work in cooperation with the punch and the die. Depth control driving means for controlling the depth with the die, position detecting means for detecting the depth amount, bending pressure detecting means for detecting the bending pressure at the time of bending, material of the work, plate thickness, apparent width in advance A depth amount / memory stored based on the above, a relationship file between the bending pressure and the bending angle in which a relationship between the bending pressure and the bending angle is stored in advance, a bending calculating means for calculating the bending width, and a bending width. A bending processing device comprising a bending width and a depth correction amount relation file in which a relation between the depth correction amount and a bending width is stored.