JP2000051950A - Method and device for precisely uniformizing bending angle for bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely uniformize bending angle without using a complicated calculation formula by bending to the end without dismounting the work from a bending machine. SOLUTION: After a work is bent near a tentative bend angle easier than a target angle, the bend angles of both left/right end parts are measured, while measuring the bend angle of a work end part of an easier bend angle side, one side bending is applied by a corresponding drive mechanism until its bend angle is made equal to the bend angle of the other work end side, after the bend angles of both left/right end parts are coincided, by simultaneously driving left/right drive mechanisms 8L, 8R, the work is bent to a target angle. Thus, after tentative bending, after one side bending is done until the bend angles of both left-right end parts of the work are made equal, the work is bent to a target angle, a precise uniformization of bending angle is obtained without using a complicated calculation formula and without dismounting a work from a bending machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for determining the accuracy of a pass in a bending machine such as a press brake.

[0002]

2. Description of the Related Art Generally, a bending machine such as a press brake equipped with an NC device is provided with a drive mechanism for a table drive shaft on each of left and right sides, and the NC device is provided with a punch and a die corresponding to a target angle. Each drive mechanism is controlled based on the distance (inter-blade distance, that is, D value) to bend the work to the target angle.

[0003] This type of NC device includes a relatively inexpensive type in which an operator directly inputs and sets a D value, and
The operator only needs to input the target angle, and there is an expensive type in which the NC device calculates the corresponding D value based on the target angle by calculation.

[0004] In such a bending machine, the bending angle of the finished workpiece may be different at both left and right ends. The cause is when the work is offset to the left or right, or when the mounting height of the mold has poor accuracy.In such a case, when bending is completed, the left drive mechanism D value (DL) and D of right drive mechanism
Since the value is naturally different from the value (DR), the D value must be corrected in preparation for processing the next work.

Therefore, conventionally, in the case of a type in which the D value is directly input to the NC device, the work is test-bent based on the input D value, and after the test bending, the work is temporarily removed from the bending machine, and the operator appropriately performs the bending. The bending angle of the right and left two places is measured using the angle measuring tool of the above, and the required D value correction amount is obtained by experience based on the measured value, and the correction amount is calculated by D.
After correcting the values (DL, DR), the corrected D values (DL, DR)
In order to confirm that the target angle can be achieved by applying DR), the work was set again and the test bending was continued.

In the case of a type in which the NC device calculates the D value corresponding to the input target angle by calculation, the workpiece is trial-bent based on the D value calculated from the target angle, and the workpiece after test bending is used. Without removing it from the bending machine
By measuring the bending angle at two places on the left and right with an appropriate angle measuring device and inputting the measured values to the NC device, the NC device is determined in advance according to the angle error between the measured value and the target value. A calculation is performed to correct DL and DR using a calculation formula, and based on the calculation result, D with respect to the target angle is calculated.
L and DR were reset.

Some bending machines are provided with a driving mechanism for the crowning shaft for correcting the bending of the table at the center in addition to the left and right driving mechanisms. The bending angle is measured at three points on the left, right, and center, and the required D value correction amount is determined by experience, and the D value (DL, DR) is corrected by the correction amount. The bending angle is measured at three points, and according to the angle error between the measured value and the target value, the NC device calculates and corrects DL and DR using a predetermined calculation formula to reset. Was.

[0008]

However, such a conventional type, in which the D value is directly input to the NC device, has the advantage of being relatively inexpensive, but has the advantage of bending the work after trial bending. It has to be once removed from the machine and then set again, which is troublesome, and a skilled operator cannot find the required D value correction amount. Therefore, the bending angle of the work is uniform from the left end to the right end. In other words, it is difficult to achieve high accuracy.

In the case of a type in which the NC device obtains the D value corresponding to the input target angle by calculation, the work does not have to be removed from the bending machine after the test bending, and even if the operator is not a skilled operator. Although it has the advantage of being operable, the NC device must have a predetermined calculation formula, and this calculation formula is a geometric theoretical formula,
This is a formula that takes into account the deflection of each part of the machine in the theoretical formula, and in any case, it is quite complicated. Therefore, the NC device becomes expensive by itself, and no matter how complicated calculation formula is used. However, when applied to actual bending work, there has been a problem that a result in accordance with the theory is often not obtained.

[0010] The present invention solves the above-mentioned problems of the prior art, does not use complicated formulas, and is therefore relatively inexpensive. It is an object of the present invention to provide a method and apparatus for obtaining a precision in a bending machine capable of providing a precision according to a bending angle.

[0011]

According to the present invention, in order to achieve the above object, a step of simultaneously driving a left and right drive mechanism to bend a work to a vicinity of a soft temporary bending angle from a target angle, Steps to measure the bending angle of the work by positioning the angle measuring means for measuring the bending angle of the inside work at the positions corresponding to the left and right ends of the work, and for the end of the work where the bending angle is weaker Selecting a drive mechanism to perform, while measuring the bending angle of the work by positioning the angle measuring means at the end of the work, a one-side bending step of driving in until the bending angle becomes equal to the bending angle of the other work end, After the bending angles of the left and right ends of the work coincide with each other, the left and right driving mechanisms are simultaneously driven to drive the work to the target angle.

As described above, after the temporary bending, the workpiece is partially bent until the bending angles of the left and right ends are equal, and then driven to the target angle, so that a complicated calculation formula can be used.
Without removing the work from the bending machine, the accuracy can be improved.

The present invention also provides a step of simultaneously driving the left and right drive mechanisms to bend the work to a position near a softer bending angle than the target angle, and an angle measurement for measuring the bending angle of the work being pressed after the temporary bending. Positioning the means at the positions corresponding to the left and right ends of the work, respectively, and measuring the bending angle of the work; and selecting a drive mechanism corresponding to the work end with the smaller bending angle, and selecting the work end. While measuring the bending angle of the workpiece by positioning the angle measuring means, the one-side bending step in which the bending angle is driven until the bending angle becomes equal to the bending angle of the other workpiece end, and the bending angles of the left and right ends of the workpiece coincided with each other. After that, the step of measuring the bending angle of the work by positioning the angle measuring means at a position corresponding to the work center, and selecting the center drive mechanism to measure the bending angle of the work center. A bending process in which herd until the bending angle is equal to the bending angle of the left and right end portions of the workpiece,
After the bending angles of the left and right end portions and the central portion of the work coincide with each other, the left and right drive mechanisms are simultaneously driven to drive the work to the target angle.

In this manner, after the temporary bending, the workpiece is bent in one direction until the bending angles at the left and right ends are equal, and further, the medium bending is performed until the bending angle at the center of the work becomes equal to the bending angles at the left and right ends. By driving to the target angle, the accuracy can be improved without using a complicated calculation formula and without removing the work from the bending machine.

The present invention also provides a step of simultaneously driving the left and right drive mechanisms to bend the work to a position near the temporary bending angle which is less than the target angle, and an angle measurement for measuring the bending angle of the work being pressed after the temporary bending. The step of measuring the bending angle of the work by positioning the means at three positions, that is, the left and right end portions and the center portion of the work, respectively, and corresponding to two positions where the bending angle is weak among the three measured positions. While selecting the drive mechanism in order, positioning the angle measuring means at each corresponding position on the work and measuring the bending angle of the work,
From the partial bending step in which both bending angles are equal to the remaining one bending angle, and the step in which the left and right drive mechanisms are driven simultaneously to drive the work to the target angle after the three bending angles match. Become.

As described above, after the temporary bending, the workpiece is partially bent until all three bending angles at the left and right end portions and the center portion are equal to each other, and then driven to the target angle, so that a complicated calculation formula is not used. Also, the precision can be improved without removing the work from the bending machine.

The present invention also provides a means for setting a target angle, a means for setting a D value corresponding to a temporary bending angle that is less than the target angle, and a method for temporarily bending a workpiece by simultaneous driving of both drive mechanisms. Angle measuring means that measures the bending angle of the workpiece positioned at the positions corresponding to the left and right ends of the workpiece, respectively. Means for selecting a drive mechanism to be driven, and, with the angle measuring means positioned at a work end corresponding to the selected drive mechanism, the drive mechanism until the measured bending angle becomes equal to the bending angle of the other work end. And a simultaneous driving means for driving both drive mechanisms simultaneously until the bending angle of the workpiece reaches the target angle after the left and right bending angles match.

As described above, after the temporary bending, the drive mechanism corresponding to the work end having the weaker bending angle on the left and right sides is selected, and the driving mechanism is selected until the bending angle becomes equal to the bending angle of the other work end. After driving the mechanism, drive both drive mechanisms simultaneously until the target angle is reached, without using complicated calculation formulas and without removing the workpiece from the bending machine,
As a result, accuracy can be obtained.

Further, the present invention provides a means for setting a target angle, a means for setting a D value corresponding to a temporary bending angle which is less than the target angle, and a method for temporarily bending a workpiece by simultaneous driving of left and right drive mechanisms. 3 at both left and right ends and the center of the work
An angle measuring means positioned at a position corresponding to each of the positions to measure a bending angle of the workpiece, and two of the three measured positions corresponding to the weak bending angles based on the bending angle measured by the angle measuring means. With the means for sequentially selecting the drive mechanism and the angle measuring means positioned at the position of the work corresponding to each selected drive mechanism, each of the respective bend angles becomes equal to the remaining one bend angle. A partial bending means for sequentially driving the driving mechanism and a simultaneous driving means for simultaneously driving the left and right driving mechanisms until the bending angle of the work reaches the target angle after the three bending angles match.

As described above, after the temporary bending, the drive mechanisms corresponding to the two positions having the gentle bending angles are sequentially selected from the three positions at the left and right end portions and the center portion of the work, and the bending angles of the work at the corresponding positions are respectively selected. Sequentially drive each drive mechanism until it becomes equal to the remaining one bending angle, and then drive the left and right drive mechanisms simultaneously until the target angle is reached. Without removing from the bending machine, accuracy can be obtained.

[0021]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a bending machine to which an accuracy setting device is attached as in the present invention.

The bending machine 1 is, for example, a table rising type press brake provided with an NC device,
An appropriate punch 5 suitable for processing is mounted on a punch holder provided on the upper table 3, and an appropriate die 9 corresponding to the punch 5 is mounted on a die holder provided on the lower table 7. Then, the work held by the operator in a state of being placed on the die 9 and hitting against the butting plate is pressed between the punch 5 and the die 7 as the lower table 7 is raised. It is configured to bend the pressing area of the work.

As shown in FIG. 11, the bending machine 1 is provided with left and right main cylinders 8L and 8R for a drive shaft for raising the lower table 7 by hydraulic pressure. Are provided with two sub-cylinders 10a and 10b for a crowning shaft for crowning with hydraulic pressure.

The NC device comprises an NC control box 11 attached to the processing machine main body, and an NC console 13 called an NC pendant, which is extended from the processing machine main body so as to be easily operated by an operator.

As shown in FIG. 5, the NC console 13 has various attributes and processing conditions such as the material of the work, the plate thickness, the target angle, the punch tip R, and the die width necessary for performing the bending. An operation unit 15 for inputting and setting a D value (depth value) or the like corresponding to a predetermined target angle,
An input / output unit 17 and a control unit 19 are provided.
The operation unit 15 includes an automatic mode switch 16A for switching to the automatic mode, a manual mode switch 16M for switching to the manual mode, a left selection switch 16L for selecting the left main cylinder 8L, and a right selection switch for selecting the right main cylinder 8R. 16R, and a crowning switch 16C for selecting the crowning sub-cylinders 10a and 10b are provided.

The NC console 13 is also provided with a hand pulsar 21 for the operator to manually drive the workpiece (increment the bending), and the hand pulsar 21 raises the lower table 7 at a register of, for example, 0.01 mm per pulse. It is set to let. Further, the NC console 13 is connected to a foot pedal 23 which is operated by the operator to start and end the bending process.

The bending machine 1 is provided with a bending angle measuring system called a bending indicator (BI) 31. The bending indicator 31
As shown in FIGS. 1 and 5, an angle measuring device called a sensor unit 41 for measuring a bending angle of a work under pressure and a digital pro (digital) for measuring a bending angle of the work detached from a processing machine main body. And two types of angle measuring devices, ie, an angle measuring device called a protector (71). The bending indicator 31 also includes an operation unit 81 and a BI control unit 91, and the sensor unit 41 is connected to the BI control unit 9.
1 while the digital pro 71 is connected to the operation unit 81
, And the BI control unit 91 is connected to the NC console 13.

As shown in FIG. 2, the sensor unit 41
Is a die 9 in front of the lower table 7 of the processing machine main body.
Move along the guide rail 43 provided extending parallel to the right and left (X direction), move the movable body 45 that can be positioned at any position, and move up and down (Z direction) from the movable body 45, An elevating body 47 that can be positioned at an arbitrary height, a sensor support 49 that can be moved back and forth (Y direction) from the elevating body 47 and positioned at an arbitrary position,
An optimum measurement position for measuring the bending angle of the workpiece under pressure by swinging the sensor head 51 so as to swing about a support axis parallel to the die 9 (direction E). Can be positioned.

As shown in FIGS. 3 and 5, the sensor head 5
1, a light sensor 55a, 55b using two phototransistors sandwiches a projector 53 using one laser diode that emits a laser beam for irradiating a work,
The optical sensors 55a and 55b are arranged at vertically symmetrical positions, and both optical sensors 55a and 55b have the same optical axis in which the laser beam reflected by the workpiece is incident in the direction approaching the optical axis of the projector 53. By arranging them at an angle, the bisector of the angle between the two incident optical axes is configured to coincide with the optical axis of the projector 53. When the sensor head 51 swings in the direction E, the laser beam emitted from the light projector 53 can follow the workpiece and take an arbitrary elevation angle from the horizontal.

As shown in FIG. 5, the sensor support 49 is provided with a stepping motor 57 which can arbitrarily adjust the elevation angle of the sensor head 51, and detects the elevation angle of the sensor head 51 in conjunction with the stepping motor 57. A rotary encoder 59 is provided. Then, while scanning the sensor head 51 within a predetermined angle range by the stepping motor 57, the light intensity of the laser beam reflected from the work is measured by each of the optical sensors 55a and 55b, and the elevation angle of the sensor head 51 during the scanning is measured. The BI control unit 91 is detected by the rotary encoder 59 and based on the elevation angle when the light intensity shows a peak.
However, the bending angle of the work is calculated.

That is, as shown in FIGS. 3 and 4, the light intensity signal Pa of the optical sensor 55a shows a peak because the angle between the incident optical axis of the optical sensor 55a and the optical axis of the projector 53 is two. When the bisector is coincident with the workpiece normal,
The light intensity signal Pb of the optical sensor 55b shows a peak when the bisector of the angle formed by the incident optical axis of the optical sensor 55b and the optical axis of the projector 53 coincides with the normal line of the workpiece. Therefore, when the elevation angle of the sensor head 51 is a bisecting angle between the elevation angle of the former and the elevation angle of the latter,
The elevation angle of the sensor head 51, that is, the optical axis of the projector 53 is
It will match the normal of the work.

Therefore, the BI control unit 91
Indicates that two optical sensors 5 are being scanned while the sensor head 51 is scanning.
The light intensity signals Pa and Pb measured at 5a and 55b and the elevation angle θ of the sensor head 51 detected by the rotary encoder 59 are sampled, and the elevation angle θa when the light intensity signal Pa shows a peak value, and the light intensity From the elevation angle θb when the signal Pb indicates the peak value, an angle θ that divides both the elevation angles θa and θb into two equal parts is calculated. The obtained angle θ is
Since the optical axis coincides with the optical axis of the light projector 53, it is known that the angle is equal to the bending angle θ of one side of the work. By doubling the obtained angle, the BI control unit 91 can bend the work under pressure. The angle 2θ is calculated.

Further, the sensor unit 41 is provided with a mode changeover switch 61 capable of selecting either the automatic overrunning mode or the manual overrunning mode. It is also configured to be able to switch from a non-selected state in which no is selected to either selected state.

As described above, since the mode changeover switch 61 is provided in the sensor unit 41 disposed in front of the bending machine 1, the operator can start the operation once in the bending work area. Even after that, automatic / manual switching can be performed as desired. That is, even after starting the work in a state where neither is selected, either the automatic run-in mode or the manual run-in mode can be selected during the work, and the automatic run-in mode was selected before the start of the work. Even after starting work in the state, it is possible to switch to the manual overrun mode and select during the work, and even after starting the work with the manual overrun mode selected before the work is started, The mode can be switched to the automatic running mode and selected.

On the other hand, the digital pro 71 has a reference surface 73 for angle measurement and a measurement surface 75 that can freely change the angle formed by the reference surface 73, and measures the angle of the work detached from the processing machine body. The reference surface 73 is in close contact with one side of the portion, and the measurement surface 75 follows the other side so that the measurement surface 75 is in close contact with the other side. The angle formed with the surface 75 is measured. The angle formed by the measurement surface 75 with respect to the reference surface 73 is measured by a magnetic measuring device called magnescale as an amount of angular movement from the origin, and the measured value is displayed on the display 77 in an angle. .

The operation unit 81 includes a keyboard 83,
A display 85 is provided. On the keyboard 83, in addition to an origin key used to set the origin of the sensor unit 41 and the digital pro 71, a ten key and a setting key for inputting a target angle, a springback and the like to the sensor unit 41, and an automatic An automatic key for selecting the run-in mode, a manual key for selecting the manual run-in mode, and various other necessary keys are provided. The display 85 is provided with a process display section 87 for displaying a process number or a mode type, and a data display section 89 for displaying an operator's input set value such as a target angle and a springback.

The angle measurement value of the sensor unit 41 is displayed on the data display unit 89 together with the indication on the process display unit 87, and the angle measurement value of the digital processor 71 is displayed on the process display unit 87. Is displayed on the data display section 89 together with the display of the data.

The BI control unit 91 is provided with a control section 93 having a function as an arithmetic processing section for calculating the bending angle of the work under pressure by the sensor unit 41, and an input / output section 95. The control unit 93 also has a function as an arithmetic processing unit that calculates an angle error between the bending angle measured by the sensor unit 41 and the target angle, and converts the angle error into a corresponding D value (depth value). The BI control unit 91 also includes a pulse generator 96 used in the auto-running mode, and a pulse generator 96 instead of the hand pulser 21 of the NC console 13 in the auto-running mode.
Is provided, and the BI control unit 91 is connected to the NC console 13 via the switch 97, so that the bending indicator 31 is connected to the NC device.

That is, the BI control unit 91
To connect to the NC console 13, the hand pulsar 2
1 to disconnect the connection connected to the input / output unit 17 of the NC console 13, and disconnect it from the pulse generator 9 of the switch 97.
6 and a common terminal of the switch 97 is connected to a connector of the input / output unit 17 to which the hand pulser 21 is connected. And NC console 1
3 for transmitting a BI start signal to the BI control unit 91;
Only the connection for transmitting the stop signal and the measurement angle signal from 1 to the NC console 13 is required.

As described above, the BI control unit 9
The operation of connecting the NC console 1 to the NC console 13 is extremely simple, and the NC console 13 does not need to be substantially modified. Therefore, the NC console 13 can be easily retrofitted to the existing NC console 13. As a result, the bending indicator 31 can be easily retrofitted to a bending machine having an existing NC device and used.

Further, the BI control unit 91 is provided with a buzzer 99 for notifying the operator of the state of the bending angle of the workpiece by a sound during the driving operation. This buzzer 99 is provided when the bending of the NC apparatus is completed. When the measured bending angle of the workpiece corresponds to the target angle, a bending end sound is generated to inform the operator of the bending angle, and when the measured bending angle of the workpiece exceeds the target angle, the operator is warned of that. When a warning sound is generated and there is an angle error in which the measured bending angle of the work has not reached the target angle, during a driving operation in which a driving stroke amount corresponding to the angle error is executed,
When a run-in operation sound is generated to inform the operator of this and the run-in operation reaches the end of the stroke,
A run-off end sound is generated to inform the operator of this.

Here, the origin search of the sensor unit 41 will be described. The origin of the sensor unit 41 is when the optical axis of the projector 53 is horizontal. for that reason,
A magnet seal is stuck at a predetermined position on the front surface of the die 9 mounted on the die holder, and the origin key of the operation unit 81 is pressed for a certain period of time to scan the sensor head 51 with respect to this vertical magnet seal. Press and hold to do this. Then, the two light sensors 55 at that time
The bisecting angle (ie, horizontal) of the peak values of a and 55b is
It is registered as the origin.

The origin of the digital pro 71 is determined by keeping the reference surface 73 and the measuring surface 75 of the digital pro 71 in close contact with a right-angle measuring tool such as a squarer and pressing the origin key of the operation unit 81 for a certain period of time. . Then, the magnetic measurement value (ie, right angle) at that time is registered as the origin.

Next, the operation of the above embodiment will be described with reference to the flowcharts shown in FIGS.

Prior to actual bending, it is necessary to measure and collect the springback in advance. Here, the bending will be described assuming that the springback has already been collected.

First, a punch 5 having a predetermined tip R is mounted on a punch holder of a bending machine 1 based on attributes such as a material, a plate thickness, and a target angle of a work, while a die having a predetermined die width is formed. 9 is mounted on the die holder. And N
A required bending angle is input to the C console 13 and the operation unit 81.

That is, assuming that the target angle S is 90 °, for example, as shown in FIG.
The target angle S (S = 90 °) is key-inputted to the operation unit 81, and the temporary bending angle P (P = 92 °) slightly less than the target angle S (2 to 3 °) is input to the NC console 13. Input values (DL, DR) (Step S
1).

In this case, it is actually necessary to consider the springback, and as a result of measuring and collecting the springback in advance, for example, the springback amount B is 1 °.
Assuming that the angle is 20 ', the workpiece is moved until the target pressing angle A (A = 88 ° 40') is obtained by incorporating the springback amount B (B = 1 ° 20 ') into the target angle S (S = 90 °). Although it is necessary to bend, in this specification, the springback is omitted. Therefore, in step S1, the target angle S (S = 90 °) and the springback amount B (B = 1
20 ') by key input, but as a result of omitting the springback amount B (B = 1 ° 20'), the above expression is obtained.

Next, the operator operates the NC console 1
3, the NC start button is pressed, the work is set at a predetermined position of the processing machine main body, and the foot pedal 23 is depressed (step S2).

When the NC start button is pressed, N
C is set to the automatic operation mode, the NC starts automatic operation, and executes bending in accordance with the programmed process (step S3).

When the lower table 7 rises and reaches the rising end of the temporary bending (step S4), the NC automatically stops the operation (step S5).

At this time, the bending angle of the workpiece is within an arbitrary error range (for example, ± 2 °) from the set temporary bending angle P (P = 92 °). In addition, the NC remains set to the automatic operation mode only by the automatic stop,
It is in an interlocked state where the D value cannot be corrected.

When the NC stops operating, the NC console 13 sends a BI start signal to the BI control unit 91 (step S6). In response, the bending indicator 31 is turned on.

First, the sensor unit 41 measures the bending angle of the work, and the measured angle value Pδ (near the temporary bending angle P including an error) is measured by the BI control unit 91.
Is displayed on the display unit 85 of the operation unit 81 via (step S7).

Here, it is determined whether or not the measured bending angle Pδ corresponds to the target angle S (coincidence or within the allowable range) (step S8). To determine whether the bending is insufficient (step S
9) If the bending is insufficient, it is determined whether the mode is set to the automatic overrun mode or the manual overrun mode (step S10).

If the measured bending angle Pδ corresponds to the target angle S (Pδ = S), the BI control unit 9
The first buzzer 99 generates an appropriate bending end sound to notify the operator of this (step S11). This allows the operator to set the bending angle of the workpiece to the target angle S.
Can be surely heard by ear.

Therefore, the operator operates the foot pedal 23
Is released (step S12).

Then, the NC console 13 stops sending the BI start signal to the BI control unit 91 (step S13). In response, the bending indicator 31 is turned off. This completes the bending.

When the bending is completed, the bending angle of the workpiece in the final pressurized state is an angle S ^* (S ^* = 90 °) corresponding to (corresponding to or within the allowable range) the target angle S. The value S ^* (S ^* = 90 °) is stored in the control unit 93 of the BI control unit 91.

The measured bending angle Pδ is too bent (Pδ
In the case of <S), as shown in FIG. 7, the buzzer 99 of the BI control unit 91 generates an appropriate warning sound to warn the operator of this (step S21).
Thereby, the operator can surely recognize by ear that the bending angle of the workpiece exceeds the target angle S and is excessively bent.

The operator who hears the warning sound releases his / her foot on the foot pedal 23 (step S22).

Then, the NC console 13 stops sending the BI start signal to the BI control unit 91 (step S23). In response, the bending indicator 31 is turned off.

Therefore, the work is replaced with a new one and the temporary bending angle P is set again (step S24). That is,
For example, assume that the new temporary bending angle is Q (Q = 93 to 94 °). Hereinafter, returning to FIG. 6, the operation after step S2 is performed.

When the measured bending angle Pδ is insufficiently bent (Pδ
In the case of> S), if the automatic run-in mode is set, as shown in FIG. 8, first, the BI control unit 91 sends a stop signal to the NC console 13 (step S31). In response to this, the NC is released from the set automatic operation mode, releases the interlock of the D value correction, and enters a state in which the D value can be corrected.

Next, the BI control unit 91
Is the angle error δ (δ) between the measured bending angle Pδ and the target angle S.
= Pδ-S) and calculate the angular error δ by the corresponding D
It is converted to a value (step S32).

Then, the BI control unit 91
Switches the switch 97 to the pulse generator 96 side (step S33), and causes the pulse generator 96 to generate a number of pulses corresponding to the D value (step S34).

Thus, the bending indicator 3
1 causes the NC to execute an automatic run-in operation (step S
35) During that time, the buzzer 99 of the BI control unit 91 generates an appropriate run-in operation sound to inform the operator of this (step S36). As a result, the operator can surely know by ear that the automatic running operation is being performed.

During this automatic running-in operation, the sensor unit 41 measures the bending angle of the work at an appropriate interval, and the measured angle value is transmitted to the BI control unit 91 via the BI control unit 91.
Display on the display 85 of the operation unit 81 (step S
37).

When the measured bending angle becomes an angle corresponding to the target angle S (coincidence or within an allowable range) (step S3).
8) On the basis of the angle measurement value transmitted from the sensor unit 41, the BI control unit 91 stops generating pulses from the pulse generator 96 (step S).
At the same time as 39), the buzzer 99 generates an appropriate run-in end sound to inform the operator that the angle has reached the target angle S (step S40). As a result, the operator can reliably know by ear that the bending angle of the workpiece has reached the angle corresponding to the target angle S.

Therefore, the operator operates the foot pedal 23
Is released (step S41).

Then, the NC console 13 stops sending the BI start signal to the BI control unit 91 (step S42). In response, the bending indicator 31 is turned off. This completes the bending.

When the bending is completed, the bending angle of the workpiece in the final pressurized state is an angle S ^* (S ^* = 90 °) corresponding to (coincidence or within an allowable range) the target angle S. The value S ^* (S ^* = 90 °) is stored in the control unit 93 of the BI control unit 91.

The above steps S34 to S38
FIG. 9 shows the steps up to this point in more detail. That is, the BI control unit 91 controls the pulse generator 9
From step 6, a predetermined number of pulses (for example, 10 pulses) are generated as an initial value, whereby the bending indicator 31 causes the NC to execute an initial catch-up operation (step S51).

During this initial pulse generation period, the buzzer 99 of the BI control unit 91 generates an appropriate run-in operation sound to inform the operator of this (step S52). As a result, the operator can reliably know by ear that the drive-in operation is being performed.

When the generation of the initial pulse is completed, the sensor unit 41 measures the bending angle of the work, and displays the measured angle on the display 85 of the operation unit 81 via the BI control unit 91 (step S53). ), The BI control unit 91 calculates a D value (D1) per pulse from the angle measurement value at that time and the initial number of pulses (that is, 10 pulses) (step S54).

Subsequently, the BI control unit 91
Is based on the obtained D value per pulse (D1).
The remaining D value (Dn) is calculated (step S55).

Then, the BI control unit 91
Causes the pulse generator 96 to generate a number of pulses (n pulses) corresponding to the D value (Dn), whereby the bending indicator 31 causes the NC to execute an automatic run-in operation (step S56).

During the n-pulse generation period, the buzzer 99 of the BI control unit 91 generates an appropriate run-in operation sound to inform the operator of this (step S57). As a result, the operator can surely know by ear that the automatic running operation is being performed.

When the generation of the n-pulse is completed, the sensor unit 41 measures the bending angle of the work, and displays the measured angle value on the display 85 of the operation unit 81 via the BI control unit 91 (step S58). ), The BI control unit 91 determines whether or not the angle measurement value at that time has reached the target angle S (step S59).
The process returns to step S55 for calculating the remaining D value (Dn).

That is, starting from the calculation of the remaining D value (Dn), a series of steps from execution of the automatic driving operation based on the D value (Dn), generation of the driving operation sound during execution, measurement of the work bending angle, and display. By repeating the above operation several times, it is possible to accurately drive to the target angle S.

On the other hand, when the measured bending angle Pδ is insufficiently bent (Pδ
> S), and when the mode is set to the manual run-in mode, as shown in FIG. 10, the operator looks at the angle measurement value Pδ displayed on the display 85 of the operation unit 81 and needs to run in. After confirming that
Press the stop button (step S61). When the NC stop button is pressed, the NC is released from the set automatic operation mode, releases the interlock of the D value correction, and enters a state in which the D value can be corrected.

Next, the operator operates the hand pulser 21 while looking at the display angle, and performs a manual driving operation (step S62).

During this manual driving operation, the sensor unit 41 measures the bending angle of the work, and the measured angle value is
The information is displayed on the display 85 of the operation unit 81 via the BI control unit 91 (step S63).

When the measured bending angle becomes an angle corresponding to the target angle S (coincidence or within an allowable range) (step S6).
4), the buzzer 99 of the BI control unit 91
An appropriate run-in end sound is generated to inform the operator of this (step S65). As a result, the operator can reliably know by ear that the bending angle of the workpiece has reached the angle corresponding to the target angle S.

The operator operates the foot pedal 23
Is released (step S66).

Then, the NC console 13 stops sending the BI start signal to the BI control unit 91 (step S67). In response, the bending indicator 31 is turned off. This completes the bending.

When the bending is completed, the bending angle of the workpiece in the final pressurized state is an angle S ^* (S ^* = 90 °) corresponding to (corresponding to or within a permissible range) the target angle S. The value S ^* (S ^* = 90 °) is stored in the control unit 93 of the BI control unit 91.

After the necessary bending is completed in this way, the work is removed from the main body of the processing machine, and the bending angle is measured using the digital pro 71 for confirmation. Then, the measured value is displayed on the display 85 of the operation unit 81, and the BI
This is stored in the storage unit of the control unit 93 of the control unit 91.

Next, a description will be given of how to obtain the accuracy of the bending angle of the workpiece by using the bending angle measuring system (BI) 31 as described above.

As shown in FIG. 11, the bending machine 1
Left and right main cylinders 8L, 8R for the drive shaft that raises the lower table 7 hydraulically, and 2 for the crowning shaft that hydraulically crowns the center of the lower table 7
Sub cylinders 10a and 10b are provided,
The crowning axis is a drive axis for correcting the deflection of the upper table 3 and the lower table 7.

That is, when the work is bent, the center of the upper table 3
Is bent upward, and the lower table 7 is bent downward. As a result, the bending angle of the work is less sweet at the center portion than at both end portions. In order to correct this phenomenon, the operation of pushing up the central portion of the lower table 7 to make the distance between the upper table 3 and the lower table 7 uniform is crowning correction.
0a and 10b.

The sub-cylinders 10a and 10b are provided with left and right main cylinders 8L and 8 for raising the lower table 7.
The pressure is controlled so as to be reduced at a predetermined pressure reduction ratio with respect to the pressure of R. That is, as the pressure reduction ratio is increased, the pressure in the sub-cylinders 10a and 10b increases, and the center of the lower table 7 is pushed up.

In order to obtain the accuracy according to the bending angle of the work,
As shown in FIGS. 12 and 13, first, the operator inputs the target angle S (S = 90 °) to the operation unit 81 by a key, and a little more than the target angle S to the NC console 13 (2 to 3 °). A D value (DL, DR) corresponding to the soft temporary bending angle P (P = 92 °) is input (step S7).
1).

Next, the operator operates the NC console 1
3, the NC start button is pressed to set the work at a predetermined position on the processing machine body, and then the foot pedal 23 is depressed (step S72). The position at which the work is set can be arbitrarily selected by the operator, but here, for ease of explanation, the work is set so that the center of the work is located near the center of the processing machine body. .

When the NC start button is pressed, N
C is set to the automatic operation mode, the NC starts automatic operation, and the main cylinders 8L and 8R raise the lower table 7 to execute bending (step S7).
3).

When the lower table 7 moves up and reaches the rising end of the temporary bending (step S74), the NC automatically stops the operation (step S75).

When the NC stops operating, the NC console 13 sends a BI start signal to the BI control unit 91 (step S76). In response, the bending indicator 31 is turned on.

First, the operator positions the sensor unit 41 at a position corresponding to the left end of the work (step S77).

Then, the sensor unit 41 measures the bending angle at the corresponding position of the work, and calculates the angle measurement value PL.
The measured angle signal (PL) is sent to the NC console 13 via the BI control unit 91 on the display 85 of the operation unit 81 (step S7).
8).

Next, the operator operates the sensor unit 4
1 is positioned at a position corresponding to the right end of the work (step S79).

Then, the sensor unit 41 measures the bending angle of the corresponding position of the work, and calculates the angle measurement value PR.
The measured angle signal (PR) is sent to the NC console 13 through the BI control unit 91 on the display 85 of the operation unit 81 (step S8).
0).

Here, the operator determines whether or not the angle measurement value PL at the left end of the work is equal to the angle measurement value PR at the right end (step S81).

If the angle at the left end is less (PL> PR), the operator operates the manual mode switch 16M to switch to the manual mode, and operates the left selection switch 16L to switch the left main cylinder 8L. Select (Step S82L).

Next, the operator operates the sensor unit 4
1 is positioned at a position corresponding to the left end of the work (step S83L).

Then, while the sensor unit 41 is measuring the bending angle at the corresponding position of the work, the operator checks the display of the angle measurement value PL while the operator operates the hand pulsar 2.
1 is operated until the angle measurement value PL becomes equal to PR (step S84L).

The angle at the right end is less sweet (PL <P
R), the operator sets the manual mode switch 16M
Is operated to switch to the manual mode, and the right selection switch 16R is operated to select the right main cylinder 8R (step S82R).

Next, the operator operates the sensor unit 4
1 is positioned at a position corresponding to the right end of the work (step S83R).

Then, while the sensor unit 41 is measuring the bending angle at the corresponding position of the workpiece, the operator checks the display of the measured angle value PR while the operator operates the hand pulsar 2.
1 is operated until the measured angle value PR becomes equal to PL (step S84R).

When the angle measurement value PL at the left end of the workpiece is equal to the angle measurement value PR at the right end in this way, the operator then operates the sensor unit 41.
Is positioned at a position corresponding to the center of the work (step S85).

Then, the sensor unit 41 measures the bending angle at the corresponding position of the work, and calculates the angle measurement value PC.
The measured angle signal (PC) is sent to the NC console 13 via the BI control unit 91 on the display 85 of the operation unit 81 (step S8).
6).

Here, the operator determines whether or not the angle measurement value PC at the center of the work is equal to the angle measurement values PL and PR at the left and right ends (step S87).

The angle measurement value PC at the center is weak (PC> P
L, PR), the operator selects the sub-cylinders 10a and 10b by operating the crowning switch 16C in the manual mode (step S88).

Then, while the sensor unit 41 is measuring the bending angle at the corresponding position of the work, the operator operates the hand pulsar 2 while watching the display of the angle measurement value PC.
1 is operated until the angle measurement value PC becomes equal to PL and PR (step S89).

As a result, the angle measurement value PC at the center of the work becomes equal to the angle measurement values PL and PR at the left and right ends. Therefore, the three angle measurement values PC, PL, and PR at the left and right ends and the center of the work are all equal,
The value is substantially the temporary bending angle P (P = 92 °).

As described above, although the workpiece has been bent to the temporary bending angle P (P = 92 °) just before the target angle S (S = 90 °), the work can be accurately performed according to the bending angle. After that, the operator operates the automatic mode switch 16A to switch to the automatic mode, and then depresses the foot pedal 23 again (step S90), whereby N
C resumes the automatic operation and executes the bending (step S91).

When the target angle S is reached (step S
92), the NC automatically stops the operation (step S9)
3).

At this time, the bending angle of the work coincides with the target angle S (S = 90 °), and the accuracy remains as it is. Because the target angle S (S = 90 °)
At the stage where the bending is slightly performed to the tentative bending angle P (P = 92 °), the accuracy of the workpiece is once obtained by the operator selecting the position, so that the target angle S (S = 90) is obtained. Although the remaining bending was slightly performed up to (°), the effect of the bending on the accuracy of the workpiece is practically negligible, and it can be said that the bending is within the allowable error range.

The left and right D values (D
L, DR) and the pressure reduction ratio of the crowning axis are stored in the storage unit of the NC console 13 in correspondence with the target angle S (S = 90 °) (step S94), so that the same processing is repeated for the next and subsequent times. It will be available.

In the above embodiment, after provisional bending, the angle at the left and right ends of the work is measured, and the sweeter one is driven in, and then the angle at the center is measured and driven. However, the present invention is not limited to this. For example, it is also possible to first measure three angles at both the left and right ends and the center of the work, and then sequentially drive in two sweet points.

In the above embodiment, the accuracy has been described by applying the present invention to a bending machine having two sub-cylinders 10a and 10b for a crowning shaft in addition to the left and right main cylinders 8L and 8R. However, the present invention is not limited to this. For example, even if the present invention is applied to a bending machine having only the left and right main cylinders 8L and 8R, the same accuracy can be obtained.

In the above embodiment, two main cylinders 8 are used as left and right drive mechanisms for the table drive shaft.
L and 8R are provided, and two sub-cylinders 10a and 10b are provided as a central drive mechanism for the crowning shaft. However, the present invention is not limited to this, and the drive mechanism, that is, the number of cylinders may be arbitrarily selected. Can be.

Further, in the above embodiment, the sensor head 51 is provided with the light projecting device 53 using one laser diode.
And an optical sensor 55 using two phototransistors
a, 55b, while scanning the sensor head 51 within a predetermined angle range, while measuring the light intensity of the laser beam reflected from the work by each optical sensor,
The elevation angle of the sensor head 51 during the scan is detected, and the bending angle of the workpiece is calculated based on the elevation angle when the light intensity shows a peak. However, the present invention is not limited to this. A non-contact type sensor unit can be used, and a contact type sensor unit can also be used.

Further, in the above embodiment, the present invention is applied to the NC device in which the operator directly inputs the D value. However, the present invention is not limited to this. The control unit 19 of the NC console 13 can also be applied to an NC device having a function as an angle / D value conversion processing unit that converts a temporary bending angle into a corresponding D value.

In the above embodiment, the workpiece is bent to the temporary bending angle by the NC device and then driven to the target angle. However, the present invention is not limited to this. It may be configured to bend to an angle.

In the above embodiment, the present invention is applied to a bending machine equipped with an NC device. However, the present invention is not limited to this. For example, the present invention can be applied to a bending machine of a type that bends with a handle. .

Further, in the above embodiment, the table raising type press brake is exemplified as the bending machine. However, the present invention is not limited to this. For example, various bending machines including a table lowering type press brake may be used. It is possible to apply to.

[0127]

As described above, according to the present invention, the step of simultaneously driving the left and right drive mechanisms to bend the work to the vicinity of the softer bending angle than the target angle, and the bending angle of the work being pressed after the temporary bending. The angle measuring means for measuring the work is positioned at the positions corresponding to the left and right ends of the work respectively, and the step of measuring the work bending angle and the drive mechanism corresponding to the work end with the weaker bending angle are selected. A single bending step of positioning the angle measuring means at the end of the work and measuring the bending angle of the work while driving the work until the bending angle becomes equal to the bending angle of the other work end; After the bending angles match, the left and right drive mechanisms are driven at the same time to drive the work to the target angle.Therefore, a complicated calculation formula is not used, so the cost is relatively low. , Just herd to the end without removing the bending machine a workpiece, there is an effect that can issue as accuracy of bending angle of the workpiece.

Also, the present invention provides a step of simultaneously driving the left and right drive mechanisms to bend a work to a position near a soft temporary bending angle from a target angle, and an angle measurement for measuring the bending angle of the work being pressed after the temporary bending. Positioning the means at the positions corresponding to the left and right ends of the work, respectively, and measuring the bending angle of the work; and selecting a drive mechanism corresponding to the work end with the weaker bending angle, and selecting the work end. While measuring the bending angle of the work by positioning the angle measuring means at the position, the bending step at which the bending angle is driven until the bending angle becomes equal to the bending angle of the other work end, and the bending angles of the left and right ends of the work coincided with each other. Then, the step of measuring the bending angle of the work by positioning the angle measuring means at a position corresponding to the center of the work, and selecting the drive mechanism at the center to measure the bending angle of the work center. A bending process in which herd until the bending angle is equal to the bending angle of the left and right end portions of the workpiece,
After the bending angles of the left and right ends and the center of the work coincide, the left and right drive mechanisms are driven simultaneously to drive the work to the target angle. Inexpensively, it is possible to obtain the accuracy according to the bending angle of the work only by driving the work to the end without removing the work from the bending machine.

The present invention also provides a step of simultaneously driving the left and right drive mechanisms to bend a work to a position near a temporary bending angle which is less than a target angle, and an angle measurement for measuring a bending angle of the work being pressed after the temporary bending. The step of measuring the bending angle of the work by positioning the means at three positions, that is, the left and right end portions and the center portion of the work, respectively, and corresponding to two positions where the bending angle is weak among the three measured positions. While selecting the drive mechanism in order, positioning the angle measuring means at each corresponding position on the work and measuring the bending angle of the work,
From the partial bending step in which both bending angles are equal to the remaining one bending angle, and the step in which the left and right drive mechanisms are driven simultaneously to drive the work to the target angle after the three bending angles match. Configuration
There is an effect that the accuracy can be obtained according to the bending angle of the work only by driving the work to the end without removing the work from the bending machine without using a complicated calculation formula and therefore relatively inexpensive.

Also, the present invention provides a means for setting a target angle, a means for setting a D value corresponding to a temporary bending angle that is less than the target angle, and a method for simultaneously bending a workpiece by simultaneous driving of both drive mechanisms. Angle measuring means that measures the bending angle of the workpiece positioned at the positions corresponding to the left and right ends of the workpiece, respectively, and responds to the end of the workpiece where the bending angle is weaker on the left and right based on the measured bending angle by the angle measuring means Means for selecting a drive mechanism to be driven, and, with the angle measuring means positioned at a work end corresponding to the selected drive mechanism, the drive mechanism until the measured bending angle becomes equal to the bending angle of the other work end. And a simultaneous bending means for simultaneously driving both drive mechanisms until the bending angle of the workpiece reaches the target angle after the left and right bending angles match. Because, without using a complicated calculation, therefore relatively inexpensive, yet, only herd to the end without removing the bending machine a workpiece, there is an effect that can issue as accuracy of bending angle of the workpiece.

Further, according to the present invention, there is provided a means for setting a target angle, a means for setting a D value corresponding to a temporary bending angle that is less than the target angle, and a method for temporarily bending a workpiece by simultaneous driving of left and right drive mechanisms. 3 at the left and right ends and the center of the work
An angle measuring means positioned at a position corresponding to each of the positions to measure a bending angle of the workpiece, and two of the three measured positions corresponding to the weak bending angles based on the bending angle measured by the angle measuring means. With the means for sequentially selecting the drive mechanism and the angle measuring means positioned at the position of the work corresponding to each selected drive mechanism, each of the respective bend angles becomes equal to the remaining one bend angle. The structure is provided with a partial bending means for sequentially driving the driving mechanism and a simultaneous driving means for simultaneously driving the left and right driving mechanisms until the bending angle of the work reaches the target angle after the bending angles of the three positions match, so that the structure is complicated. Without using formulas, it is relatively inexpensive.Furthermore, just removing the workpiece from the bending machine to the end without removing There is an effect that can be issued.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bending machine to which a precision setting device is attached.

FIG. 2 is a perspective view of a sensor unit.

FIG. 3 is an explanatory diagram of an angle measurement principle by a sensor head.

FIG. 4 is a graph showing the relationship between the elevation angle of the sensor head and the light intensity of the optical sensor.

FIG. 5 is a system block diagram of a street accuracy setting device.

FIG. 6 is a flowchart showing the operation of the accuracy setting device.

FIG. 7 is a flowchart in the case of excessive bending.

FIG. 8 is a flowchart in the case of insufficient bending.

FIG. 9 is a detailed flowchart of a part of FIG. 8;

FIG. 10 is a flowchart in the case of a manual run-in mode.

FIG. 11 is a schematic explanatory view of a main part of the bending machine.

FIG. 12 is the first half of a flowchart for obtaining the accuracy as shown in FIG.

FIG. 13 is a second half of a flowchart for obtaining the accuracy as shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending machine (press brake) 3 Upper table 5 Punch 7 Lower table 8L, 8R Main cylinder 9 Die 10a, 10b Subcylinder 11 NC control box 13 NC console 15 Operation part 16A Automatic mode switch 16M Manual mode switch 16L Left selection switch 16R Right selection switch 16C Crowning switch 16C 17 Input / output unit 19 Control unit 21 Hand pulser 23 Foot pedal 31 Bending indicator (BI) 41 Sensor unit 43 Guide rail 45 Moving body 47 Lifting body 49 Sensor support 51 Sensor head 53 Floodlight 55a, 55b Optical sensor 57 Stepping motor 59 Rotary encoder 61 Mode switch 71 Digital pro (digital retractor) 73 Reference plane 5 measuring surface 77 display 81 operating unit 83 Keyboard 85 Display 87 Step display unit 89 the data display unit 91 BI control unit 93 controls unit 95 input unit 96 the pulse generator 97 switcher 99 Buzzer

Claims (21)

[Claims] In a bending machine provided with an NC device and left and right drive mechanisms for a table drive shaft, a step of simultaneously driving the left and right drive mechanisms to bend a work to a position near a soft temporary bending angle from a target angle. After tentative bending, positioning the angle measuring means for measuring the bending angle of the work under pressure at positions corresponding to the left and right ends of the work, respectively, and measuring the bending angle of the work. While selecting the drive mechanism corresponding to the sweet end of the work, positioning the angle measuring means at the end of the work and measuring the bending angle of the work, the bending angle is equal to the bending angle of the other work end. The process consists of a single bending process to drive the workpiece to the target angle and a process of driving the left and right drive mechanisms simultaneously to drive the workpiece to the target angle after the bending angles of the left and right ends of the workpiece match. As accuracy out how to. 2. The method according to claim 1, wherein the one-side bending step is manually driven by a pulse generator. 3. A method according to claim 1, further comprising the step of registering each drive amount of the left and right drive mechanisms in correspondence with the target angle after driving to the target angle. . 4. A bending machine comprising an NC device, a left and right drive mechanism for a table drive shaft, and a central drive mechanism for a crowning shaft, wherein the left and right drive mechanisms are simultaneously driven to target a workpiece. Bending the workpiece by bending it to a position near the temporary bending angle that is softer than the angle, and positioning the angle measuring means that measures the bending angle of the workpiece during pressurization after the temporary bending at positions corresponding to the left and right ends of the workpiece, respectively. Measuring the angle and selecting the drive mechanism corresponding to the end of the workpiece with the weaker bending angle, positioning the angle measuring means at the end of the workpiece and measuring the bending angle of the workpiece, The one-side bending process that drives in until the bending angle becomes equal to the bending angle of the other end of the work. After the bending angles of the left and right ends of the work match, position the angle measuring means at the position corresponding to the center of the work Measuring the bending angle of the work, and selecting the center drive mechanism, measuring the bending angle at the center of the work, and driving in until the bending angle is equal to the bending angles at the left and right ends of the work. And a step of simultaneously driving the left and right drive mechanisms to drive the workpiece to a target angle after the bending angles of the left and right ends and the central portion of the workpiece coincide with each other. 5. The method according to claim 4, wherein the one bending step and the middle bending step are manually driven by a pulse generator. 6. A bending machine comprising an NC device, a left and right drive mechanism for a table drive shaft, and a central drive mechanism for a crowning shaft, wherein the left and right drive mechanisms are simultaneously driven to target a workpiece. Bending process to a softer bending angle near the angle than the angle, and angle measuring means for measuring the bending angle of the pressurized work after the temporary bending are positioned at the positions corresponding to the left, right, both ends and the center of the work. Then, the step of measuring the bending angle of the work, and sequentially selecting the drive mechanisms corresponding to the two places where the bending angle is weak from the three measured places, and positioning the angle measuring means at the corresponding positions of the work. While measuring the bending angle of the workpiece, a partial bending process that drives both bending angles to be equal to the remaining one bending angle. After the three bending angles match, the left and right drive As accuracy out wherein the step of herd workpiece to the target angle allowed simultaneously driven mechanism, in that it consists of. 7. The method according to claim 6, wherein the partial bending step is manually driven by a pulse generator. 8. The bending process according to claim 4, further comprising the step of registering the respective drive amounts of the left and right and center drive mechanisms in correspondence with the target angle after driving to the target angle. How to get the accuracy of the machine. 9. The bending according to claim 1, wherein the step of driving to the target angle is performed while positioning the angle measuring means at a position corresponding to the workpiece and measuring a bending angle thereof. A method for obtaining accuracy as in a processing machine. 10. The method according to claim 1, wherein the step of measuring the bending angle of the workpiece is performed without contacting the workpiece. 11. A bending machine provided with an NC device and left and right drive mechanisms for a table drive shaft, a means for setting a target angle, and a D value corresponding to a temporary bending angle that is less than the target angle. Means for temporarily bending the work by simultaneous driving of both drive mechanisms, and angle measuring means positioned at positions corresponding to the left and right ends of the work to measure the bending angle of the work, and the bending angle by the angle measuring means A means for selecting a drive mechanism corresponding to the work end having a smaller bending angle between the left and right based on the measured value; and a method of setting the angle measurement means at the work end corresponding to the selected drive mechanism. One-side bending means that drives the drive mechanism until the measured angle value becomes equal to the bending angle of the other work end. After the left and right bending angles match, the work bending angle becomes the target angle. And a simultaneous drive means for simultaneously driving both drive mechanisms up to the same. 12. The bending machine according to claim 11, wherein the angle measuring means is configured to be movable between left and right driving mechanisms along a guide rail provided on a front surface of the table. Precision setting device. 13. The apparatus according to claim 11, wherein the one-side bending means is a pulse generator operated by an operator. 14. A bending machine according to claim 11, further comprising means for registering each driving amount of the left and right driving mechanisms in correspondence with the target angle after driving to the target angle. Out device. 15. A bending machine provided with an NC device, a left and right drive mechanism for a table drive shaft, and a central drive mechanism for a crowning shaft, wherein a means for setting a target angle, and a target angle less than the target angle. Means for setting a D value corresponding to the temporary bending angle; and, after the workpiece is temporarily bent by simultaneous driving of the left and right drive mechanisms, the workpiece is positioned at positions respectively corresponding to the left and right ends and the center of the workpiece. An angle measuring means for measuring a bending angle of the motor, and a means for sequentially selecting a drive mechanism corresponding to two of the three measured positions having a weak bending angle based on the measured bending angle by the angle measuring means. In a state where the angle measuring means is positioned at the position of the work corresponding to each of the drive mechanisms, the respective drive mechanisms are sequentially turned until both bending angles become equal to the remaining one bending angle. As described above, there is provided a partial bending means for driving in, and a simultaneous driving means for simultaneously driving the left and right driving mechanisms until the bending angle of the work reaches the target angle after the three bending angles match. apparatus. 16. The selecting means first selects a drive mechanism corresponding to the one having a gentler bending angle from the left and right ends of the work, and after the bending angles of the left and right ends are matched by the partial bending means, 16. The precision setting device according to claim 15, wherein a driving mechanism corresponding to the central portion is selected. 17. The apparatus according to claim 15, wherein said angle measuring means is movable between right and left driving mechanisms via a central driving mechanism along a guide rail provided on a front surface of the table. Accuracy setting device in a bending machine. 18. The apparatus according to claim 15, wherein said partial bending means is a pulse generator operated by an operator. 19. The apparatus according to claim 15, further comprising: means for registering each drive amount of the left, right, and center drive mechanisms in correspondence with the target angle after driving to the target angle.
A precision setting device as in the bending machine described. 20. The angle measuring device according to claim 11, wherein the angle measuring device is positioned at a position corresponding to the workpiece during the driving operation to the target angle by the simultaneous driving device. A precision setting device in the bending machine described in the above. 21. The apparatus according to claim 11, wherein the angle measuring means measures the workpiece without contacting the workpiece.
A precision setting device as in the bending machine described.