JP2000317526A - Soft rigidity bending method and soft rigidity bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate trial bending in bending work and to make automatic control operation of the bending work possible. SOLUTION: Because the physical quantity A at loading time and mechanical control physical quantity A' of a work W which are bending angles at loading time are physical quantities which are generated as the result of the interaction between the work W and the bending machine M, the both are affected by a work characteristics w and mechanical properties (m). Then, the work characteristics is greatly made to reflect on the mechanical control physical quantity A' to the degree where the effect imparted to the mechanical control physical quantity A' which is controllable on the side of the bending machine at the time of the last stage of the maximum stroke of a die at the time of bending with the mechanical properties m is negligible. By calculating and estimating the amount B of spring back from this reflected mechanical control physical quantity A', the bending angle A at loading time at the time of the last stage of the maximum stroke at the time of bending work is opimized and the work is automatically bent to the target bending angle C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible bending method and a flexible bending machine.

[0002]

2. Description of the Related Art Conventionally, bending performed by using a bending machine 101 is performed by a plate material W (hereinafter, referred to as "work") positioned on a die 103 as shown in FIG.
Is performed with the punch 105 lowered. At this time, the bending angle θ of the work W is controlled by the stroke Y of the punch 105 from the absolute origin fixed to the machine frame of the bending machine 101. Generally, an operator takes out the bent work W from the bending machine 101 and measures the bending angle θ with a protractor.

In FIG. 7, a contact sensor 107 embedded in a punch 105 is used as a bending angle detecting device so that a bending angle can be measured on-process.
In addition to the contact sensor 107, the angle measuring means may be an optical sensor, a CCD camera image, a contact sensor approaching the work W from the die 103 side, or the like.

Further, in this specification, other drawings including FIG. 7 are exemplified by a descending bending machine 101, but the same applies to an ascending bending machine 101. is there.

When the conventional bending work is analyzed and classified,
There are three types as shown in A, B, and C below.

A: The bending angle detecting device is a bending machine 101
(1) Increase the stroke Y in FIG. (2) The work W is taken out from the bending machine 101 and the bending angle after springback is measured.

The above operations (1) and (2) are repeated,
When the desired bending angle is reached, the trial bending operation is finished, and the product processing is started with the stroke Y determined here.

B: The bending angle detecting device is a bending machine 101
(1) Increase the stroke Y in FIG. (2) The bending angle θ is measured with a load applied to the work W by the mold. (3) It is determined whether the bending angle θ is equal to the sum of the desired bending angle and the amount of springback (angle) predicted in advance.

The above operations (1), (2) and (3) are repeated. When the operations (3) become “equal”, the test bending operation is terminated, and the product is produced using the stroke Y determined here. Processing starts.

C: The bending angle detecting device is a bending machine 101
Even if it is attached to the workpiece, the work of (1), (2), and (3) in B is performed for each bending point without using a constant stroke Y, and the stroke Y is changed each time to perform the product processing. Will be

[0011]

The conventional problems are as follows when enumerated for each of A, B, and C.

In the case of A: (1) Even if the stroke Y is determined once, the bending machine 1
Since the heat generated from 01 deforms the machine frame and shifts the absolute origin of the stroke Y, there is a limit to the time during which the determined stroke Y is valid.

(2) Even if the stroke Y is determined once,
When the work W changes, the physical characteristics of the work W change. (I) Since the reaction force received by the bending machine 101 from the work W changes, the deflection of the machine frame changes, and the absolute origin of the stroke Y shifts. And (ii) the amount of springback changes, and the same stroke Y changes the bending angle of the work W after the unloading of the mold. Therefore, when the work W is changed, the determined stroke Y becomes invalid. Become.

In the case of B: (1) Even if the stroke Y is determined once, the bending machine 1
Since the heat generated from 01 deforms the machine frame and shifts the absolute origin of the stroke Y, there is a limit to the time during which the determined stroke Y is valid.

(2) Even if the stroke Y is determined once,
When the work W changes, the physical characteristics of the work W change. (I) Since the reaction force received by the bending machine 101 from the work W changes, the deflection of the machine frame changes, and the absolute origin of the stroke Y shifts. And (ii) it is determined that the work W is changed because the amount of spring back predicted in advance changes and the bending angle of the work W after the mold unloading changes in the same stroke Y. Stroke Y becomes invalid.

In the case of C: (1) Even if the stroke Y is determined once, if the work W changes, the physical characteristics of the work W change. Therefore, (i) the reaction force received by the bending machine 101 from the work W Therefore, the deflection of the machine frame changes, the absolute origin of the stroke Y shifts, and (ii) the springback amount predicted in advance changes. Because the bending angle changes,
When the work W is changed, the determined stroke Y becomes invalid.

As described above, in any of the cases A, B, and C, trial bending is required at regular time intervals and whenever the work W is changed.

Hereinafter, the cause of the conventional problem will be described.

FIG. 8 is a diagram schematically illustrating the state of the conventional bending process in FIG. This FIG.
In FIG. 7, the punch 105 in FIG.
09 and the lower part of the punch 111 are represented such that the force is transmitted via a spring 113. That is, even if the stroke Y of the upper part 109 of the punch is increased, the lower part 111 of the punch is not driven in, and the stroke is changed to Z.
And

FIG. 9 shows Z, θ, F, Z− in FIG.
It represents the relationship between Y and Y. Note that F is the compressive force of the spring 113, ZY represents the length of the spring 113,
The subscript s represents a state when the workpiece W is bent to a preset angle, and the subscript s ′ represents a state when the workpiece W is bent to a preset angle. Things.

FIG. 9 shows the relationship between θ and F due to the difference in work characteristics.
It changes like Since s and s' have the same bending angle, θ does not change. Since θ is determined by the positions of the die 103, the work W, and the punch lower part 111, the stroke Z does not change.

However, the value of F changes due to the difference in the work characteristics, becomes Fs and Fs', respectively, and a difference ΔF occurs. Thereby, ZY (that is, the length of the spring 113)
Change to Zs-Ys and Zs'-Ys', respectively.

However, since Zs = Zs', 45 °
Using the reference line, Ys and Ys' are determined as shown in FIG. As a result, the difference ΔY (= Ys′−Ys) is obtained. Therefore, even if an attempt is made to realize the same θ, θ
When the F relationship changes, the stroke Y is changed by Δ
It is necessary to change only Y.

However, since the conventional bending machine 101 has a high mechanical rigidity and is not dulled, the straight line representing the F to ZY relationship is substantially horizontal as shown in FIG. ΔY becomes very small. That is, Δ (Z−Y) / Δ
Since F is small, ΔY / ΔF is small.

As described above, although the difference ΔY is small, it seems to be good, it causes the following problems.

(1) The final target of the bending process is the shape of the work W after the load from the mold is released. Therefore, it is meaningless if θ is stable when F is acting, and it is necessary to predict the springback amount after F is unloaded. The amount of springback depends only on the work characteristics. Therefore, the fact that the difference ΔY is very small although it is an important clue means that the characteristics of the work cannot be grasped, which makes it difficult to predict the springback amount.

(2) There are many factors that cause the difference ΔY due to characteristics other than the work W, such as mechanical rigidity and thermal rigidity of the machine frame. In order to predict the springback amount that depends only on the work characteristics, it is necessary to exclude the difference ΔY caused by the above-mentioned mechanical characteristics, which is a disturbance factor, and to extract only the difference ΔY purely caused by the work characteristics.

However, in the conventional bending machine 101,
The difference ΔY caused by the work characteristics and the difference ΔY caused by the mechanical characteristics enter at almost the same size, making it difficult to predict.

FIG. 10 shows an example of a method of determining the stroke value Y _OB to be continued to be driven when the difference ΔY caused by the work characteristic can be successfully extracted as shown in FIG. 90 ° bending angle for Y _S and Y _OB
Experiments have shown that a linear relationship exists in the vicinity. However, in the conventional high-rigidity bending machine 101, since there are many differences ΔY due to mechanical characteristics, it is not possible to adapt as it is.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to eliminate trial bending in bending. It is another object of the present invention to provide a bending method and an apparatus capable of performing an automatic control operation for bending.

[0031]

According to a first aspect of the present invention, there is provided a flexible bending method according to the first aspect of the present invention, wherein the mechanical characteristics of the bending machine are such that the bending operation is performed when the maximum stroke of the mold during the bending operation is performed. Work characteristics are largely reflected in the mechanical control physical quantity to such an extent that the influence on the mechanical control physical quantity that can be controlled by the machine is negligible, and the springback amount is calculated and predicted from the reflected mechanical control physical quantity. This optimizes the bending angle of the workpiece at the time of the maximum stroke in the bending process, and automatically bends to the target bending angle.

Therefore, the characteristics of the work are largely reflected on the mechanical control physical quantity to such an extent that the influence of the mechanical properties of the bending machine on the mechanical control physical quantity can be ignored.
Since the bending machine is made flexible, the amount of springback can be predicted from the reflected mechanical control physical quantity. As a result, since the bending angle of the workpiece at the time of the maximum stroke during the bending process is optimized, the workpiece is automatically bent to the target bending angle without performing the test bending.

According to a second aspect of the present invention, there is provided a flexible bending method comprising: a movable mold having an operating portion for pressing a work and a driving portion for driving the operating portion via an elastic body;
FIG. 6 shows the relationship among the bending angle of the work, the stroke of the operating portion, the stroke of the driving portion, the length of the elastic body, and the compressive force of the elastic body when performing the bending of the work in cooperation with the fixed mold. From the bending mechanical balance diagram, to increase the slope of the relationship between the length of the elastic body and the compressive force of the elastic body,
The difference in the stroke of the drive unit due to the difference in the work is detected as the difference in the characteristics of the work, and the stroke value of the drive unit to be driven in is calculated based on the regression equation obtained in advance, based on the detected stroke of the drive unit, The stroke of the drive unit is automatically adjusted based on the calculated stroke value of the drive unit to be driven.

Therefore, the stroke of the drive unit that can be controlled in the movable mold and the stroke of the operating unit that is actually acting on the work are separated via the elastic body, and the bending dynamic balance line due to the difference in the work characteristics. By increasing the inclination between the difference in the length of the elastic body and the difference in the elastic force in the figure, the difference in the stroke of the drive unit increases. As a result, a stroke value to further drive the drive unit is calculated based on the regression equation based on the stroke of the drive unit.

That is, since the work characteristics are effectively detected on the bending machine side in the on-process as described above, springback depending only on the work characteristics can be accurately predicted. As a result, a desired bending process is performed with the stroke of the operating portion in consideration of the springback amount without performing the test bending.

In addition, since the stroke of the driving unit is made dull as described above, the stroke of the operating unit that actually acts on the work is finely controlled.

According to a third aspect of the present invention, there is provided a flexible bending machine comprising: a movable mold having an operating portion for pressing a work; and a driving portion for driving the operating portion via an elastic body. A fixed mold for bending the work in cooperation with the vertical movement is provided, and the bending angle of the work, the stroke of the operating section, the stroke of the drive section, the length of the elastic body, and the compressive force of the elastic body are provided. From the bending mechanical balance diagram showing the relationship, it is configured to increase the inclination of the relationship between the length of the elastic body and the compressive force of the elastic body, and the difference in the stroke of the drive unit due to the difference in the work is determined by the difference in the work characteristics. And a calculating unit for calculating a stroke value of the drive unit to be driven based on a regression equation previously obtained from the calculated stroke of the drive unit. And it is characterized in that formed by providing a controller having a command unit which gives an instruction for adjusting the stroke of the drive unit by the stroke value of Mbeki driver.

Therefore, the stroke of the drive unit which can be controlled in the movable mold and the stroke of the operation unit which is actually acting on the work are separated through the elastic body. By increasing the inclination of the difference between the length of the elastic body and the difference between the elastic forces in the bending dynamics balance diagram due to the difference in the work characteristics, the difference in the stroke of the drive unit increases. As a result, a stroke value to further drive the drive unit is calculated based on the regression equation based on the stroke of the drive unit.

That is, since the work characteristics are effectively detected on the bending machine side in the on-process as described above, springback depending only on the work characteristics can be accurately predicted. As a result, a desired bending process is performed with the stroke of the operating portion in consideration of the springback amount without performing the test bending.

Further, since the stroke of the drive unit is made dull as described above, the stroke of the operation unit that actually acts on the work is finely controlled.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a flexible bending method and a flexible bending machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram of a flexible bending machine.

Here, W represents a work, w represents a work characteristic that changes depending on a material, a plate thickness, a bending width, a lot, a difference in rolls, and the like, M represents a bending machine, m represents mechanical rigidity, heat A represents the mechanical characteristics of the bending machine M such as rigidity, and A represents the physical quantity of the workpiece W when the workpiece W is loaded at the time of the maximum stroke during the bending process. Bending angle θ of workpiece W under load
A ′ represents a physical quantity (mechanical control physical quantity) that can be controlled by the machine at the time of the maximum stroke during bending, and B is a physical quantity to be expected, specifically, a springback quantity (overbend quantity). A corresponding physical quantity is represented, and C is a finally intended physical quantity, specifically, a desired bending angle (usually 90 °).

As shown in FIG. 1, the work characteristic w
Affects the physical quantity A under load of the work W, the mechanical quantity A ′ for machine control, and the physical quantity B to be expected. A mechanical characteristic m, which is a characteristic of the bending machine M, affects the physical quantity A of the workpiece W under load and the mechanical control physical quantity A ′.

In other words, the loaded physical quantity A and the mechanical control physical quantity A ′ of the workpiece W, which are the bending angle under load, are physical quantities generated as a result of the interaction between the workpiece W and the bending machine M, and therefore both of the workpiece characteristics w And the mechanical characteristics m.

Since the above-mentioned expected physical quantity B corresponding to the springback amount is affected only by the work characteristic w, the work characteristic w is detected by any method.
The physical quantity A under load of the work W, which is the bending angle under load, must be optimized. For this purpose, the work characteristic w is largely reflected on the mechanical control physical quantity A 'to such an extent that the influence of the mechanical property m on the mechanical control physical quantity A' can be ignored. By predicting the springback amount as the physical quantity B to be predicted, the loaded physical quantity A of the work W is optimized.

The above is the concept of the flexible bending machine.

Referring to FIG. 2, a metal mold comprising, for example, a punch 3 as a movable mold and a die 5 as a fixed mold of a bending machine 1 used as a flexible bending machine in the embodiment of the present invention. The state where the workpiece W is bent by the mold is shown.

The bending machine 1 is different from the mechanical schematic representation of the conventional bending shown in FIG. 8 in that a punch lower part 7 as an operating part in which the punch 3 actually presses the work W and this punch An upper part 9 of the punch as a driving unit for driving the lower part 7 is provided.
1 and F to Z as shown in FIG.
The point is that the slope Δ (Z−Y) / ΔF of the −Y relationship is increased.

Note that Y is a stroke of the upper punch 9 from the absolute origin, Z is a stroke of the lower punch 7 from the absolute origin, F is a compression force of the spring 11, and Z-
Y represents the length of the spring 11.

Although not shown in FIG. 2, the upper part 9 of the punch is a mold elevating drive device 13 such as an elevating drive cylinder.
6 (see FIG. 6), the stroke Y is configured to be adjusted by the mold stroke adjusting device 15 shown in FIG. The lower punch 7 is configured to be driven via a spring 11 by a stroke Y of the upper punch 9.

Further, as shown in FIG. 2, the work W as the physical quantity A under load of the work W at the time of the maximum stroke in the bending process is provided near the tip of the punch lower part 7 as shown in FIG.
For example, a contact sensor is provided as the bending angle detecting device 17 for measuring the bending angle θ under load.

Referring to FIG. 3, the bending angle θ of the work W
FIG. 6 shows how Z, F, ZY, and Y change when θ changes from θ _A to θ _B.

As can be seen from FIG. 3, when the bending angle θ of the workpiece W is changed from θ _A to θ _B , the stroke Y changes Y _B -Y _A ,
The stroke Z is changed only by ZB-ZA. That is, the stroke Y is in a state where the stroke Y is dull because the inclination Δ (Z−Y) / ΔF of the F to Z−Y relationship is increased.

It is desirable that the value of the ratio of (Z _B -Z _A ) / (Y _B -Y _A ) is small.
Is controlled, and it is possible to finely control the stroke Z actually involved in bending.

Referring to FIGS. 4 and 5, there is shown a method for performing a test-bending-free working by the flexible bending machine 1 according to the embodiment of the present invention.

FIG. 4 shows the relationship between θ and F due to the difference in the work characteristics.
It changes as shown in the bending mechanical dynamics diagram.

The suffix s represents the state when a certain work W is bent to a preset angle, and the suffix s' is bent to another work W to a predetermined angle. It represents the state at the time.

For example, when the bending angle θ of the two works W is θ
_{Even if the} stroke Z is the same as _S = θ _S ′, that is, the stroke Z is the same as ZS = ZS ′, the compression force F becomes F _S圧 縮 if the work characteristics are different.
It is different from F _S '. As a result, the stroke Y becomes Y _S
It is different from ≠ Y _S ′.

However, as described above, the gradient Δ (Z−
Y) / ΔF is increased, so that the difference Δ
(F _S -F _S ') the difference in the work characteristic is reflected as the difference between the stroke Y Δ (Y _S -Y _S' becomes larger detectable as).

FIG. 5 shows a method of determining the stroke value Y _OB to be continued to be driven when the difference ΔY due to the work characteristics has been successfully extracted as described above.

As shown in FIG. 5 by the strokes Y _S and Y _S ′ detected by the bending dynamics balance diagram in FIG. 4, the 45 ° reference line is used in accordance with the regression equation obtained in advance, and the drive is continued. The power stroke value Y _OB is determined.

As described above, since the difference between the strokes Y _S and Y _S ′ due to the difference in the work characteristics is enlarged, the difference between the respective stroke values Y _OB and Y _OB ′ to be driven in further increases, and the mechanical characteristics are increased. It can be seen that the change in the stroke Y due to this is negligibly small. That is, only the work characteristics are successfully extracted.

In actual bending, θ is determined by the characteristic of the work.
In order to obtain a desired bending angle even when the relations F to F are different for each bending point, a stroke Y determined for each bending point as shown in the bending mechanical balance diagram of FIG.
_S is monitored, Y _OB is calculated from the regression formula shown in FIG. 5, the stroke Y of the upper punch 9 is driven and optimized, and the lower punch 7 taking into account the amount of springback is adjusted.
Is given, and the workpiece W is bent to a desired desired bending angle.

Of course, these operations are easily and automatically performed by the controller 19 in an on-process manner.

Referring to FIG. 6, as the control device 19, an input device 23 such as a keyboard as input means for inputting various data to the CPU 21 as a central processing unit and various data are displayed. CR
A display device 25 such as T is connected.

As shown in FIG. 6, the CPU 21 stores data such as material, plate thickness, bending length, bending angle, flange length, etc., as shown in FIG. A memory 27 in which the regression equation is input and stored in advance from the input device 23 is connected.

The CPU 21 detects the difference ΔY in the stroke Y of the upper part 9 of the punch due to the difference in the work W as the difference in the characteristic of the work W from the relational expression of the bending mechanical balance diagram shown in FIG. A calculating device 29 for calculating the stroke value Y _OB of the upper punch 9 to be driven in based on the regression equation previously obtained in the memory 27 by using the stroke Y of the upper punch 9 and the calculating device 29. The upper part 9 of the punch to be driven
Of the upper part 9 of the punch by the stroke value Y _OB of
Is connected to the mold stroke adjusting device 15 for giving a command to adjust the pressure.

As described above, according to the present invention, as described above, the bending machine 1 is made to be flexible between the operating part of the movable mold and the driving part via the elastic body, and then the stroke of the driving part is made. Y
Is to be selected. That is, since the machine characteristics are largely taken into account in the stroke Y because the machine frame is flexible, the stroke Y required to bend the workpiece W geometrically to a constant bending angle θ is clearly detected, The amount of overbend is calculated from the detected stroke Y based on a regression equation, and the stroke Y is automatically driven by the amount of overbend.

Therefore, the bending angle detecting device 17 is only for recognizing that the workpiece W has been geometrically deformed to a constant angle, and the value of the bending angle θ under a load during bending is very significant. There is no.

In other words, in the present invention, the stroke Y
Is used as the work characteristic detecting means, and at the same time, the overbend amount is calculated directly from the stroke Y information, and the stroke Y is automatically driven in, so that the mold can be unloaded without performing test bending. It is characterized in that the work W after being formed is formed into a desired shape. In other words, the entire bending machine 1 is a sensor for detecting the work characteristics, and the work W is bent by the sensor called the bending machine 1.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes.

The bending machine 1 is not limited to the ascending type or the descending type, and the method of detecting the bending angle θ is not limited to the above-described method. For example, as an angle measuring means, there is an optical sensor, a CCD camera image, a contact sensor approaching the work from the die side, etc., regardless of the contact sensor as the bending angle detecting device described above.

The means for dulling the stroke Y is not particularly limited. Further, in the above-described embodiment, the elastic body is a coil spring, but may be a leaf spring or another mechanical method.

[0075]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, the influence of the mechanical characteristics of the bending machine on the mechanical control physical quantity is negligible. Because the characteristics of the work were largely reflected in the mechanical control physical quantity, and the bending machine was made flexible,
The springback amount can be predicted from the mechanical control physical quantity. As a result, it is possible to optimize the bending angle of the workpiece at the time of maximizing the stroke during the bending process, and to automatically perform the bending process to the target bending angle.

According to the second aspect of the present invention, the stroke of the drive unit that can be controlled in the movable mold and the stroke of the operating unit that is actually acting on the work are separated via the elastic body, so that the work characteristics can be improved. Since the inclination of the difference between the length of the elastic body and the difference between the elastic forces in the bending mechanical balance diagram due to the difference is increased, the difference in the stroke of the drive unit can be increased. As a result, it is possible to calculate a stroke value to further drive the drive unit based on the regression equation based on the stroke of the drive unit.

Therefore, the work characteristics can be effectively detected on the bending machine side in the on-process, and as a result,
Since the springback that depends only on the characteristic of the workpiece can be accurately predicted, a desired bending process can be performed by obtaining a stroke of the operating portion in consideration of the springback amount without performing the test bending.

Further, since the stroke of the driving section is made dull as described above, the stroke of the operating section that actually acts on the work can be finely controlled.

According to the third aspect of the present invention, the effect of the second aspect is substantially the same as that of the second aspect, wherein the stroke of the drive section that can be controlled in the movable mold and the stroke of the operating section that is actually acting on the work are set. Since the separation between the elastic body and the difference in the elastic force in the bending mechanical balance diagram due to the difference in the work characteristics is made larger by the separation through the elastic body, the difference in the stroke of the drive unit can be made larger. As a result, it is possible to calculate a stroke value to further drive the drive unit based on the regression equation based on the stroke of the drive unit.

Therefore, the work characteristics can be effectively detected on the bending machine side in the on-process, and as a result,
Since the springback that depends only on the characteristic of the workpiece can be accurately predicted, a desired bending process can be performed by obtaining a stroke of the operating portion in consideration of the springback amount without performing the test bending.

Further, since the stroke of the drive unit is made dull as described above, the stroke of the operation unit that actually acts on the work can be finely controlled.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a conceptual diagram of a flexible bending machine.

FIG. 2, showing an embodiment of the present invention, is a front view of a mold in a flexible bending machine.

FIG. 3 shows the embodiment of the present invention, and is a diagram relating to dulling of a stroke.

FIG. 4 shows an embodiment of the present invention, and is a bending dynamics balance diagram for a flexible bending machine.

FIG. 5 is a diagram based on a regression equation showing an example of a method of determining an overbend amount in the flexible bending machine according to the embodiment of the present invention.

FIG. 6 is a block configuration diagram of a control device according to the embodiment of the present invention.

FIG. 7 is a front view of a mold showing a state of a conventional bending process.

FIG. 8 is a schematic front view related to a mechanical expression of a conventional bending process.

FIG. 9 is a machining dynamics balance diagram in a conventional bending process.

FIG. 10 is a diagram based on a regression equation showing an example of a method of determining an overbend amount in a conventional bending process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending machine (flexible bending machine) 3 Punch (movable mold) 5 Die (fixed mold) 7 Punch lower part (operating part) 9 Punch upper part (drive part) 11 Spring (elastic body) 17 Bending angle detecting device 19 control unit 27 memory 29 arithmetic unit 31 command unit

Continued on the front page (72) Inventor Kazushi Tanemura 312-13 Mado, Hiratsuka-shi, Kanagawa F-term (reference) 4E063 AA01 BA07 FA02 FA05 JA01 JA07 LA08 LA10 LA17 LA20

Claims (3)

[Claims] 1. The characteristics of a workpiece are reduced to such an extent that the mechanical characteristics of the bending machine have a negligible effect on a mechanical control physical quantity that can be controlled by the bending machine when the maximum stroke of a mold during bending is negligible. Optimally adjusts the bending angle of the workpiece at the time of maximum stroke during bending by calculating and predicting the springback amount based on the reflected mechanical control physical quantity. A flexible bending method characterized by bending at an angle. 2. A method according to claim 1, further comprising: a movable mold having an operating portion for pressing the work and a driving portion for driving the operating portion via an elastic body; From the bending mechanical dynamics balance diagram showing the relationship between the bending angle of the work, the stroke of the operating part, the stroke of the drive part, the length of the elastic body and the compressive force of the elastic body, the length of the elastic body and the The slope of the relationship with the compressive force of the elastic body is increased, and the difference in the stroke of the drive unit due to the difference in the work is detected as the difference in the characteristics of the work. Based on the detected stroke of the drive unit, the regression equation determined in advance And calculating the stroke value of the drive unit to be driven in based on the calculated stroke value of the drive unit, and automatically adjusting the stroke of the drive unit based on the calculated stroke value of the drive unit to be driven. 3. A movable mold comprising an operating part for pressing a work and a driving part for driving the operating part via an elastic body;
A fixed mold for bending the work in cooperation with the vertical movement of the movable mold; a bending angle of the work, a stroke of the operating section, a stroke of the drive section, a length of the elastic body, and an elastic body; From the bending dynamics balance diagram showing the relationship with the compressive force, the inclination of the relationship between the length of the elastic body and the compressive force of the elastic body is configured to be large, and the difference in the stroke of the drive unit due to the difference in the work. Calculating a stroke value of a drive unit to be driven in based on a regression equation previously obtained from the calculated stroke of the drive unit, and a calculation device that calculates a stroke value of the drive unit to be driven. And a command unit for giving a command to adjust the stroke of the drive unit according to the stroke value of the drive unit to be driven in. .