JP4280333B2 - Bending angle control method and apparatus for bending machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bending angle control method and a bending angle control device in a bending machine such as a press brake.
[0002]
[Prior 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 the left and right sides, and the NC device is based on a D value (depth value) corresponding to a target angle. Each drive mechanism is controlled to bend the workpiece to near the target angle.
[0003]
Here, the D value is the distance between the punch and the die corresponding to the target angle (ie, the distance between the blades), in other words, the amount of pressurization stroke of the table corresponding to the target angle. Depending on the type of NC device, the operator directly inputs and sets the D value, and the operator only has to input the target angle, and the NC device calculates the corresponding D value based on the target angle. There is a type of which is obtained and set according to.
[0004]
In both types, the finished angle is within the allowable range by operating the hand pulser (manual operation pulse generator) as needed to drive the workpiece after bending (increment bending). It is done to fit.
[0005]
In such a bending machine, if the work after the bending process is removed from the bending machine, it is inevitable that a springback occurs. The bending angle widened by the amount of the spring back is the finished angle of the workpiece.
[0006]
Therefore, in the past, the workpiece was once removed from the bending machine, the bending angle was measured, the operator determined how much more to drive based on that angle, and the workpiece was set on the bending machine again. I'm doing the driving-in work.
[0007]
[Problems to be solved by the invention]
However, in such a conventional apparatus, it is indispensable to remove and reset the workpiece when the operator performs the follow-up operation, and when the finished angle cannot be obtained at one time, the workpiece is removed and reset. Therefore, there is a problem that it is time-consuming and troublesome for the operator, and is troublesome for the operator and cannot improve the efficiency of bending.
[0008]
This invention solves the above-mentioned problems of the conventional apparatus, and once the work is attached to the bending machine and the bending process is started, the work can be driven to the end without removing the work from the bending machine. It is an object of the present invention to provide a bending angle control method and apparatus.
[0009]
The present invention is also capable of driving the work to the end without once removing the work from the bending machine after the work is once attached to the bending machine, and to a bending machine equipped with an existing NC device. It is an object of the present invention to provide a bending angle control method and apparatus for a bending machine that can be easily applied.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a step of collecting a springback amount in advance, a step of obtaining a target pressurization angle incorporating the springback amount into the target angle based on the target angle and the springback amount, and a bending process Bending the workpiece to near the temporary bending angle, which is sweeter than the target angle by the machine, a driving step for driving the workpiece to the target pressure angle after the temporary bending is completed, and a step for measuring the bending angle of the workpiece during the driving operation, And displaying the angle measurement value for use by the operator.
[0011]
In this way, after the provisional bending is completed, the operator can display the measured bending angle value of the workpiece for use by the operator during the driving operation for driving the workpiece to the target pressure angle that incorporates the springback amount into the target angle. Without removing the workpiece from the bending machine, it is possible to drive to the end while viewing the display of the angle measurement value.
[0012]
The present invention also includes a step of collecting a springback amount in advance, a step of providing an angle control means, setting a target angle and a springback amount in the angle control means, and a target incorporating the springback amount in the target angle. A step of obtaining a pressurizing angle, a step of setting a D value corresponding to a temporary bending angle that is sweeter than a target angle in the NC device, a step of bending the workpiece to the vicinity of the temporary bending angle by the NC device, Based on the step of measuring the bending angle and the angle error between the angle measurement value and the target pressurization angle, the angle control means transfers the number of pulses necessary for the NC device to execute the automatic driving operation, thereby targeting the workpiece. And a driving process for driving up to the pressing angle.
[0013]
In this way, based on the angle error between the measured bending angle of the workpiece at the end of provisional bending and the target pressurization angle, the angle control means transfers the pulse to the NC device to drive the workpiece to the target pressurization angle. The workpiece can be automatically driven to the end without removing it from the bending machine.
[0014]
The present invention also includes a step of collecting a springback amount in advance, a step of providing an angle control means, setting a target angle and a springback amount in the angle control means, and a target incorporating the springback amount in the target angle. The step of obtaining the pressurization angle, the step of setting a D value corresponding to a temporary bending angle that is sweeter than the target angle in the NC device, the step of bending the workpiece to the vicinity of the temporary bending angle by the NC device, and the generation of a pulse after the temporary bending is completed During the process of driving the workpiece to the target pressure angle by generating a pulse by operating the instrument, and during the driving operation, the angle control means measures the bending angle of the workpiece and displays it for use by the operator. Process.
[0015]
As described above, after the provisional bending is completed, during the driving operation for driving the workpiece to the target pressurization angle by the operation of the pulse generator, the measured value of the bending angle of the workpiece is displayed for use by the operator. By operating the pulse generator while observing the display of the angle measurement value without removing it from the bending machine, the workpiece can be manually driven to the end.
[0016]
Further, the present invention corresponds to an operation means for setting a target angle and a pre-collected springback amount, a control means for obtaining a target pressurization angle by incorporating the springback amount into the target angle, and a provisional bending angle that is sweeter than the target angle. A pulse generating means for generating a number of pulses required to cause the NC apparatus to perform an automatic driving operation for driving the workpiece to a target pressurizing angle following the temporary bending by the NC apparatus in which the D value is set; When the NC apparatus is performing an automatic driving operation by a pulse transferred from the control unit, angle measuring means for measuring the bending angle of the workpiece and means for displaying the angle measurement value for use by the operator are provided.
[0017]
In this way, during the automatic driving operation of driving the workpiece to the target pressurization angle by the pulse of the pulse generation means following the temporary bending, the workpiece bending angle measurement value is displayed for use by the operator. Without detaching from the bending machine, the workpiece can be automatically driven to the end while viewing the angle measurement value display.
[0018]
Further, the present invention corresponds to an operation means for setting a target angle and a pre-collected springback amount, a control means for obtaining a target pressurization angle by incorporating the springback amount into the target angle, and a provisional bending angle that is sweeter than the target angle. The angle measuring means for measuring the bending angle of the workpiece during the manual driving operation for driving the workpiece to the target pressurization angle by operating the pulse generator following the temporary bending by the NC device in which the D value is set, and the angle measurement value And means for displaying for use by an operator.
[0019]
In this way, during the manual driving operation to drive the workpiece to the target pressurization angle by operating the pulse generator following the temporary bending, the operator can bend the workpiece by displaying the measured bending angle value of the workpiece for use by the operator. By operating the pulse generator while observing the display of the angle measurement value without removing it from the processing machine, the workpiece can be manually driven to the end.
[0020]
The present invention further includes a pulse generator for manual driving, an operation means for setting a target angle and a pre-collected springback amount, a control means for obtaining a target pressurization angle by incorporating the springback amount into the target angle, Following the temporary bending by the automatic generating pulse generating means and the NC device in which the D value corresponding to the temporary bending angle that is less than the target angle is set, the NC device moves the workpiece to the target pressurizing angle based on the applied pulse. During the driving-in operation, the angle measuring means for measuring the bending angle of the workpiece, the means for displaying the angle measurement value for use by the operator, and the pulse generating source applied to the NC apparatus are the pulse generator or the pulse generating means. Switching means for switching to any one of them, and is configured to be connectable to the NC unit via this switching means.
[0021]
As described above, during the driving operation for driving the workpiece to the target pressurization angle based on the applied pulse after the temporary bending, the operator can display the measured bending angle value of the workpiece for use by the operator. Without detaching from the processing machine, you can drive to the end while viewing the display of the angle measurement value. In addition, this bending angle control device is connected to the NC device via a switching means for switching between a pulse generator used when the operator manually drives in and a pulse generating means used in the automatic driving operation. Therefore, it can be easily retrofitted to a bending machine equipped with an existing NC device.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
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 a bending angle control device according to the present invention is attached.
[0023]
The bending machine 1 is, for example, a table raising type press brake equipped with an NC device, and an appropriate punch 5 suitable for processing is mounted on a punch holder provided on the upper table 3, while the lower table An appropriate die 9 corresponding to the punch 5 is mounted on the die holder provided in 7. And, by pressing the work held by the operator in a state of being put on the die 9 and hitting the abutting plate between the punch 5 and the die 7 as the lower table 7 is raised, It is comprised so that the pressurization area | region of a workpiece | work may be bent.
[0024]
The NC device includes an NC control box 11 attached to the processing machine main body, and an NC console 13 called an NC pendant that is attached to the processing machine main body so as to be easily operated by the operator.
[0025]
As shown in FIG. 5, the NC console 13 is input and set with various attributes and machining conditions such as workpiece material, plate thickness, target angle, punch tip R, die width and the like necessary for executing bending. An operation unit 15 having a keyboard and a display, an input / output unit 17, and an angle / D value conversion processing unit that converts the set target angle into an ascending stroke amount of the lower table 7, that is, a D value (depth value). And a control unit 19 having the functions as described above. Then, based on the calculated D value, a servo unit (not shown) is provided in the NC control box 11 so as to bend the workpiece to the vicinity of the target angle by raising the lower table 7 to the target height by hydraulic pressure or a motor. It has been.
[0026]
The NC console 13 is also provided with a hand pulser 21 that is operated by an operator as needed to drive the workpiece after bending (increment the bending). The hand pulser 21 is, for example, 0.01 mm per pulse. It is set to raise the lower table 7 in register. Further, a foot pedal 23 is connected to the NC console 13 for stepping operation when the operator starts and ends the bending process.
[0027]
The bending machine 1 is provided with a bending angle control system called a bending indicator (BI) 31. As shown in FIGS. 1 and 5, the bending indicator 31 includes an angle measuring device called a sensor unit 41 that measures the bending angle of the workpiece being pressed, and the bending angle of the workpiece removed from the processing machine body. Two types of angle measuring devices, an angle measuring device called a digital pro (digital protector) 71 for measuring, are provided. The bending indicator 31 also includes an operation unit 81 and a BI control unit 91. The sensor unit 41 is connected to the BI control unit 91, while the digital processor 71 is connected to the BI control unit 91 via the operation unit 81. The BI control unit 91 is connected to the NC console 13.
[0028]
As shown in FIG. 2, the sensor unit 41 moves to the left and right (X direction) along a guide rail 43 provided in parallel with the die 9 in front of the lower table 7 of the processing machine body. A movable body 45 that can be positioned at an arbitrary position, an elevator body 47 that moves up and down (Z direction) from the movable body 45, and a front and rear body (Y direction) that can be positioned at an arbitrary height. And a sensor support 49 that can be positioned at an arbitrary position, and a sensor head 51 that is supported by the sensor support 49 so as to be swingable around a support axis parallel to the die 9 (direction E). Thus, the sensor head 51 can be positioned at the optimum measurement position for measuring the bending angle of the workpiece being pressed.
[0029]
As shown in FIGS. 3 and 5, the sensor head 51 has optical sensors 55a and 55b using two phototransistors sandwiching a projector 53 using one laser diode that emits a laser beam that irradiates the workpiece. However, both optical sensors 55a and 55b are arranged so that the optical axis on which the laser beam reflected by the workpiece is incident is close to the optical axis of the projector 53. Are arranged so as to be inclined at the same angle, so that the bisector of the angle formed by both incident optical axes coincides with the optical axis of the projector 53. As the sensor head 51 swings in the E direction, the laser beam emitted from the projector 53 can follow the workpiece and take an arbitrary elevation angle from the horizontal.
[0030]
As shown in FIG. 5, the sensor support 49 is provided with a stepping motor 57 that can arbitrarily adjust the elevation angle of the sensor head 51, and a rotary encoder that detects the elevation angle of the sensor head 51 in conjunction with the stepping motor 57. 59 is provided. While the sensor head 51 is scanned within a predetermined angle range by the stepping motor 57, the light intensity of the laser beam reflected from the workpiece is measured by each of the optical sensors 55a and 55b, and the elevation angle of the sensor head 51 during the scan is measured. The BI control unit 91 calculates the bending angle of the workpiece based on the elevation angle detected by the rotary encoder 59 and when the light intensity shows a peak.
[0031]
That is, as shown in FIG. 3 and FIG. 4, the light intensity signal Pa of the optical sensor 55 a has a peak that is a bisector of the angle formed by the incident optical axis of the optical sensor 55 a and the optical axis of the projector 53. Coincides with the normal line of the workpiece, and the light intensity signal Pb of the optical sensor 55b shows a peak of the angle 2 between the incident optical axis of the optical sensor 55b and the optical axis of the projector 53. Since the bisector coincides with the normal of the workpiece, when the elevation angle of the sensor head 51 is a bisection angle between the elevation angle in the former and the elevation angle in the latter, the elevation angle of the sensor head 51, that is, the projector 53. The optical axis of this corresponds to the normal line of the workpiece.
[0032]
Therefore, the BI control unit 91 samples the light intensity signals Pa and Pb measured by the two optical sensors 55a and 55b and the elevation angle θ of the sensor head 51 detected by the rotary encoder 59 during scanning of the sensor head 51. Then, from the elevation angle θa when the light intensity signal Pa exhibits a peak value and the elevation angle θb when the light intensity signal Pb exhibits a peak value, an angle θ that bisects both elevation angles θa and θb is obtained by calculation. . Since the obtained angle θ coincides with the optical axis of the projector 53, it can be seen that the calculated angle θ is equal to the bending angle θ for one side of the workpiece, and the BI control unit 91 can be added by doubling the obtained angle. The bending angle 2θ of the workpiece under pressure is calculated.
[0033]
Further, the sensor unit 41 is provided with a mode changeover switch 61 that can select either the automatic follow-up mode or the manual follow-up mode. It is configured to be able to switch from a non-selected state to either selected state.
[0034]
As described above, since the mode changeover switch 61 is provided in the sensor unit 41 arranged in front of the bending machine 1, the operator can perform the operation within the bending work area and once the work is started. The automatic / manual switching can be selected as desired. In other words, even if you start the work with neither selected, you can select either the automatic driving mode or manual driving mode during the work, and you have selected the automatic driving mode before starting the work. Even after starting work in the state, you can switch to manual follow-up mode during work and select it, and even after starting work with manual follow-up mode selected before starting work, This can be selected by switching to the automatic tracking mode.
[0035]
On the other hand, the DigiPro 71 includes 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 a position where the angle of the workpiece removed from the processing machine body is to be measured. The reference surface 73 and the measurement surface 75 coincide with the bending angle of the workpiece by causing the reference surface 73 to be in close contact with one side and the measurement surface 75 to follow the other side so that the measurement surface 75 is in close contact with the other side. The angle formed by The angle formed by the measurement surface 75 with respect to the reference surface 73 is measured by a magnetic measuring instrument called a magnescale as the amount of angular movement from the origin, and the measured value is displayed on the display 77 as an angle. .
[0036]
The operation unit 81 includes a keyboard 83 and a display 85. On the keyboard 83, in addition to the origin key used when setting the origin of the sensor unit 41 and the digital processor 71, the numeric keypad and setting key for inputting the target angle, the spring back, etc. to the sensor unit 41, the automatic operation of the sensor unit 41 Various necessary keys are provided such as an automatic key for selecting the driving mode, a manual key for selecting the manual driving mode, and the like. Further, the display unit 85 is provided with a process display unit 87 for displaying a process number or a mode type, and a data display unit 89 for displaying an input set value by an operator such as a target angle and a springback.
[0037]
Then, the angle measurement value of the sensor unit 41 is displayed on the data display unit 89 together with the display on the process display unit 87, and the angle measurement value of the digital processor 71 is displayed on the process display unit 87 with the display indicating that. Are displayed on the data display unit 89.
[0038]
The BI control unit 91 is provided with a control unit 93 having a function as an arithmetic processing unit for calculating the bending angle of the workpiece being pressed by the sensor unit 41 and an input / output unit 95. Also has a function as an arithmetic processing unit that calculates an angle error between the measured bending angle and the target angle by the sensor unit 41 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 automatic driving mode, and a switch 97 for using the pulse generator 96 in place of the hand pulser 21 of the NC console 13 in the automatic driving mode. The BI control unit 91 is connected to the NC console 13 via the switch 97, and therefore, the bending indicator 31 is connected to the NC device.
[0039]
That is, in order to connect the BI control unit 91 to the NC console 13, the connection connected to the input / output unit 17 of the NC console 13 is disconnected from the hand pulser 21, and it is connected to the side opposite to the pulse generator 96 of the switch 97. In addition, the common terminal of the switch 97 is connected to the connector of the input / output unit 17 to which the hand pulser 21 is connected. It is only necessary to make a connection for transmitting a BI start signal from the NC console 13 to the BI control unit 91 and a connection for transmitting a stop signal from the BI control unit 91 to the NC console 13.
[0040]
As described above, the operation for connecting the BI control unit 91 to the NC console 13 is very simple, and it is not necessary to substantially modify the NC console 13, so that it can be easily retrofitted to the existing NC console 13. Can do. As a result, the bending indicator 31 can be easily retrofitted to a bending machine equipped with an existing NC device.
[0041]
In addition, the BI control unit 91 is provided with a buzzer 99 for notifying the operator of the bending angle of the workpiece during sounding operation by sound, and this buzzer 99 is provided at the end of bending by the NC device. When the measured value corresponds to the target angle, a bending end sound is generated to inform the operator of this, and when the measured value of the workpiece bending angle exceeds the target angle, a warning sound is sent to warn the operator of that. When there is an angle error that occurs and the measured value of the bending angle of the workpiece does not reach the target angle, a driving operation sound that informs the operator during the driving operation that is executed by the driving stroke amount corresponding to the angle error And the operator is informed when the end of the stroke reaches the end of the stroke. Is made as to generate an end sound narrowing have.
[0042]
Here, the origin setting of the sensor unit 41 will be described. The sensor unit 41 has the origin when the optical axis of the projector 53 is horizontal. For this reason, a magnet seal is attached to a predetermined position on the surface facing the front of the die 9 mounted on the die holder, and the origin key of the operation unit 81 is pressed to scan the sensor head 51 against the magnet seal forming the vertical surface. This is done by pressing for a certain time. Then, the bisector (that is, horizontal) of the peak values of the two light sensors 55a and 55b at that time is registered as the origin.
[0043]
The origin of the digital controller 71 is determined by pressing the origin key of the operation unit 81 for a certain period of time while the reference surface 73 and the measurement surface 75 of the digital processor 71 are in close contact with a right angle measuring tool such as a square. Then, the magnetic measurement value (that is, right angle) at that time is registered as the origin.
[0044]
Next, the effect | action of said embodiment is demonstrated using the flowchart shown to FIGS.
[0045]
Prior to actual bending, it is necessary to measure and collect the spring back in advance, but the collection of the spring back will be described later, and here the bending will be described on the assumption that the spring back has already been collected.
[0046]
First, the punch 5 having a predetermined tip R is mounted on the punch holder of the bending machine 1, while the die 9 having a predetermined die width is mounted on the die holder. Then, a required bending angle is input to the NC console 13 and the operation unit 81.
[0047]
That is, if the target angle S is, for example, 90 ° and the springback amount B is, for example, 1 ° 20 ′, the operator first sets the target angle S (S (S = 90 °) and the spring back amount B (B = 1 ° 20 ′), and the temporary bending angle P (P = 92 °) slightly less than the target angle S (2-3 °) on the NC console 13 Is input (step S1). In response to this, the control unit 19 of the NC console 13 converts the temporary bending angle P into a D value corresponding thereto.
[0048]
Then, the BI control unit 91 calculates the target pressurization angle A (A = 88 ° 40 ′) obtained by weaving the springback amount B (B = 1 ° 20 ′) into the target angle S (S = 90 °). Obtained automatically (step S2).
[0049]
Next, the operator presses the NC start button of the NC console 13, sets the work at a predetermined position of the processing machine body, and then steps on the foot pedal 23 (step S3).
[0050]
When the NC start button is pressed, the NC is set to the automatic operation mode, the NC starts automatic operation, and executes bending according to the programmed process (step S4).
[0051]
When the lower table 7 is raised and reaches the rising end of provisional bending (step S5), the NC automatically stops operation (step S6).
[0052]
At this time, the bending angle of the workpiece is within a range of an arbitrary error (for example, ± 2 °) from the set temporary bending angle P (P = 92 °). Further, when the automatic stop is performed, the NC remains in the automatic operation mode and is in an interlocked state in which the D value cannot be corrected.
[0053]
When the NC stops operation, the NC console 13 sends a BI start signal to the BI control unit 91 (step S7). In response to this, the bending indicator 31 is turned on.
[0054]
First, the sensor unit 41 measures the bending angle of the workpiece, and displays the angle measurement value Pδ (near the temporary bending angle P including an error) on the display 85 of the operation unit 81 via the BI control unit 91. (Step S8).
[0055]
Here, it is determined whether or not the measured bending angle Pδ corresponds to the target angle S (matches or falls within the allowable range) (step S9). (Step S10), if the bending is insufficient, it is determined whether the automatic driving mode or the manual driving mode is set (step S11).
[0056]
When the measured bending angle Pδ corresponds to the target pressurization angle A (Pδ = A), the buzzer 99 of the BI control unit 91 generates an appropriate bending end sound to notify the operator of this (step S12). . As a result, the operator can surely know by ear that the bending angle of the workpiece corresponds to the target pressure angle A.
[0057]
Therefore, the operator releases the foot that was stepping on the foot pedal 23 (step S13).
[0058]
Then, the NC console 13 stops sending a BI start signal to the BI control unit 91 (step S14). In response to this, the bending indicator 31 is turned off. This completes the bending.
[0059]
The bending angle of the workpiece in the final pressure state when the bending is finished is an angle A corresponding to (matching or within an allowable range) the target pressure angle A. ^* (A ^* = 88 ° 40 ′), and the angle value A ^* (A ^* = 88 ° 40 ′) is stored in the control unit 93 of the BI control unit 91.
[0060]
When the measured bending angle Pδ is excessively bent (Pδ <A), as shown in FIG. 7, the buzzer 99 of the BI control unit 91 generates an appropriate warning sound to warn the operator (step). S21). Thereby, the operator can surely know by the ear that the bending angle of the workpiece exceeds the target pressure angle A and is excessively bent.
[0061]
The operator who has heard the warning sound releases the foot that has stepped on the foot pedal 23 (step S22).
[0062]
Then, the NC console 13 stops sending a BI start signal to the BI control unit 91 (step S23). In response to this, the bending indicator 31 is turned off.
[0063]
Therefore, the workpiece is replaced with a new one, and the provisional bending angle P is reset (step S24). That is, for example, a new temporary bending angle is set to Q (Q = 93 to 94 °). Thereafter, returning to {circle around (2)} in FIG. 6, the operations after step S3 are performed.
[0064]
When the measured bending angle Pδ is insufficient bending (Pδ> A), if the automatic driving mode is set, first, the BI control unit 91 sends a stop signal to the NC console 13 as shown in FIG. (Step S31). In response, the NC is released from the set automatic operation mode, the D value correction interlock is released, and the D value can be corrected.
[0065]
Next, the BI control unit 91 calculates an angle error δ (δ = Pδ−A) between the measured bending angle Pδ and the target pressurization angle A, and converts the angle error δ into a corresponding D value (step). S32).
[0066]
Then, the BI control unit 91 switches the switch 97 to the pulse generator 96 side (step S33), and generates a number of pulses corresponding to the D value from the pulse generator 96 (step S34).
[0067]
As a result, the bending indicator 31 causes the NC to execute an automatic driving operation (step S35), and during that time, the buzzer 99 of the BI control unit 91 generates an appropriate driving operation sound to inform the operator of this (step S36). . As a result, the operator can know by ear that the automatic driving operation is being performed.
[0068]
During this automatic driving operation, the sensor unit 41 measures the bending angle of the workpiece at an appropriate interval, and displays the measured angle value on the display unit 85 of the operation unit 81 via the BI control unit 91 (step S37). .
[0069]
When the measured bending angle is an angle corresponding to (matching or within the allowable range) the target pressurization angle A (step S38), the BI control unit 91 causes the pulse generator 96 to perform the measurement based on the angle measurement value transmitted from the sensor unit 41. Is stopped (step S39), and the buzzer 99 generates an appropriate driving end sound notifying the operator that the angle corresponds to the target pressurization angle A (step S40). Thus, the operator can surely know by ear that the bending angle of the workpiece has become an angle corresponding to the target pressurization angle A.
[0070]
Therefore, the operator releases the foot that was stepping on the foot pedal 23 (step S41).
[0071]
Then, the NC console 13 stops sending a BI start signal to the BI control unit 91 (step S42). In response to this, the bending indicator 31 is turned off. This completes the bending.
[0072]
The bending angle of the workpiece in the final pressure state when the bending is finished is an angle A corresponding to (matching or within an allowable range) the target pressure angle A. ^* (A ^* = 88 ° 40 ′), and the angle value A ^* (A ^* = 88 ° 40 ′) is stored in the control unit 93 of the BI control unit 91.
[0073]
FIG. 9 shows the above-described steps S34 to S38 in more detail. That is, the BI control unit 91 generates a predetermined number of pulses (for example, 10 pulses) as an initial value from the pulse generator 96, and thereby the bending indicator 31 causes the NC to perform an initial driving operation ( Step S51).
[0074]
During this initial pulse generation period, the buzzer 99 of the BI control unit 91 generates an appropriate driving sound for notifying the operator of this (step S52). Thus, the operator can surely know by the ear that the driving operation is being performed.
[0075]
When the generation of the initial pulse is finished, the sensor unit 41 measures the bending angle of the workpiece and displays the measured angle value on the display unit 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 pulse number (ie, 10 pulses) (step S54).
[0076]
Subsequently, the BI control unit 91 calculates the remaining D value (Dn) based on the obtained D value (D1) per pulse (step S55).
[0077]
Then, the BI control unit 91 generates a number of pulses (n pulses) corresponding to the D value (Dn) from the pulse generator 96, whereby the bending indicator 31 causes the NC to perform an automatic driving operation ( Step S56).
[0078]
During the n pulse generation period, the buzzer 99 of the BI control unit 91 generates an appropriate driving sound for notifying the operator of this (step S57). As a result, the operator can know by ear that the automatic driving operation is being performed.
[0079]
When the generation of n pulses is finished, the sensor unit 41 measures the bending angle of the workpiece, and displays the measured angle value on the display unit 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 pressurization angle A (step S59). If the target pressurization angle A has not been reached, the remaining D value (Dn) is determined again. ) Is returned to step S55.
[0080]
That is, starting from the calculation of the remaining D value (Dn), a series of operations ranging from execution of automatic driving operation based on the D value (Dn), generation of driving noise during execution, measurement of workpiece bending angle, and display are performed. By repeating several times, the target pressurization angle A can be accurately driven.
[0081]
On the other hand, when the measured bending angle Pδ is insufficiently bent (Pδ> A) and the manual driving mode is set, the operator is displayed on the display unit 85 of the operation unit 81 as shown in FIG. The angle measurement value Pδ is checked to confirm that the driving is necessary, and then the NC stop button is pressed (step S61). When the NC stop button is pressed, the NC is released from the set automatic operation mode, the D value correction interlock is released, and the D value can be corrected.
[0082]
Next, the operator operates the hand pulser 21 while looking at the display angle, and manually performs the follow-up operation (step S62).
[0083]
During the manual driving operation, the sensor unit 41 measures the bending angle of the workpiece, and displays the measured angle value on the display unit 85 of the operation unit 81 via the BI control unit 91 (step S63).
[0084]
When the measured bending angle becomes an angle corresponding to (matching or within the allowable range) the target pressurization angle A (step S64), the buzzer 99 of the BI control unit 91 generates an appropriate driving end sound to notify the operator of this. (Step S65). Thus, the operator can surely know by ear that the bending angle of the workpiece has become an angle corresponding to the target pressurization angle A.
[0085]
Therefore, the operator releases the foot that was stepping on the foot pedal 23 (step S66).
[0086]
Then, the NC console 13 stops sending a BI start signal to the BI control unit 91 (step S67). In response to this, the bending indicator 31 is turned off. This completes the bending.
[0087]
The bending angle of the workpiece in the final pressure state when the bending is finished is an angle A corresponding to (matching or within an allowable range) the target pressure angle A. ^* (A ^* = 88 ° 40 ′), and the angle value A ^* (A ^* = 88 ° 40 ′) is stored in the control unit 93 of the BI control unit 91.
[0088]
When the necessary bending process is completed in this way, the work is first removed from the processing machine body as shown in FIG. 11 (step S71). Then, the workpiece is detached from the punch 5 and the die 9 and becomes completely unloaded, and the bending angle is slightly opened by the spring back. That is, the angle A at the end of bending ^* (A ^* = 88 ° 40 ′), the angle F (F = 90 °) is increased by a springback amount B (B = 1 ° 20 ′).
[0089]
Next, an operator measures the bending angle of a workpiece | work using the digital processor 71 (step S72).
[0090]
Then, the angle measurement value F (F = 90 °) is displayed on the display 77 of the digital processor 71 and also displayed on the display 85 of the operation unit 81 (step S73). In other words, the operation unit 81 displays that the digital display is being used on the process display unit 87 of the display unit 85 and displays the angle measurement value F (F = 90 °) on the data display unit 89. From this, the operator can know that the bending angle F (F = 90 °) of the completely unloaded workpiece is equal to the target angle S (S = 90 °).
[0091]
As described above, the bending process is correctly performed, and a workpiece bent to a predetermined target angle S (S = 90 °) is obtained.
[0092]
Next, measurement and collection of springback performed prior to actual bending will be described.
[0093]
First, a test piece made of the same material and thickness as the workpiece and thickness of the workpiece to be bent is prepared. As long as the material and thickness of the test piece are the same as those of the workpiece, the size of the test piece does not need to be the same as that of the workpiece, and an appropriate size that can be easily handled can be selected. Although such a test piece is not a workpiece, it functions in the same manner as a workpiece only for the purpose of measuring springback, and will be referred to as a workpiece hereinafter.
[0094]
When such a workpiece is prepared, when the target angle S is 90 °, for example, the operator inputs the target angle S (S = 90 °) into the operation unit 81 and inputs the NC into the NC console 13 from the target angle S. A slight temporary bending angle P (P = 92 °) is key-inputted.
[0095]
Next, the operator presses the NC start button of the NC console 13, sets the work at a predetermined position on the processing machine body, and then steps on the foot pedal 23 (see step S3 in FIG. 6).
[0096]
Hereinafter, in the same manner as in FIGS. 6 to 10, the “target pressure angle A” is read as “target angle S”, and the workpiece (test piece) is bent.
[0097]
When the bending process is completed, the workpiece is removed from the processing machine body as shown in FIG. 12 (step S81). As a result, the workpiece is completely unloaded, and the angle S at the end of bending is set. ^* (S ^* = 90 °), the angle F is increased by the amount corresponding to the springback (for example, F = 91 ° 20 ′).
[0098]
Next, an operator measures the bending angle of a workpiece | work using the digital processor 71 (step S82).
[0099]
Then, the angle measurement value F (F = 91 ° 20 ′) is displayed on the display 77 of the digital processor 71 and also displayed on the display 85 of the operation unit 81 (step S83). In other words, the operation unit 81 displays that the digital display is being used on the process display unit 87 of the display unit 85 and displays the angle measurement value F (F = 91 ° 20 ′) on the data display unit 89. From this, the operator can know that the bending angle of the workpiece spread by the springback is F (F = 91 ° 20 ′).
[0100]
Next, the operator presses the spring back key of the operation unit 81 (step S84).
[0101]
Then, the control unit 93 of the BI control unit 91 makes the bending angle S in the final pressurized state. ^* (S ^* = 90 °) and the bending angle F (F = 91 ° 20 ′) in the no-load state, the springback amount B (B = 1 ° 20 ′) is calculated and obtained. While displaying on the display part 89, it memorize | stores and registers in the memory | storage part of the control part 93 (step S85). By looking at this display, the operator can accurately know the springback amount B (B = 1 ° 20 ′) without calculating it himself.
[0102]
This completes the measurement and collection of the springback.
[0103]
As described above, when this bending angle control device is used, the measurement of the springback is completed and the data can be stored in the BI control unit 91. Suitable for repeated use when processing.
[0104]
In addition, even if not all of the workpieces that need to be processed, even if it is not just before processing, if there is a test piece or sample workpiece, the spring back is measured in advance and the data is sent to the BI control unit 91. Since it can be registered, it is possible to execute the measurement and registration work of the springback in a time interval between the machining times, so that the work schedule can be given a degree of freedom.
[0105]
In the above-described embodiment, the sensor head 51 includes the projector 53 using one laser diode and the optical sensors 55a and 55b using two phototransistors, and the sensor head 51 is configured at a predetermined angle. While scanning within the range, the light intensity of the laser beam reflected from the workpiece is measured by each optical sensor, and the elevation angle of the sensor head 51 during the scan is detected, and based on the elevation angle when the light intensity shows a peak. Although it is configured to calculate the bending angle of the workpiece, it is not limited to this. For example, an appropriate non-contact type sensor unit can be used, and a contact type can also be used. is there.
[0106]
In the above embodiment, when a temporary bending angle is key-inputted to the NC console 13, the control unit 19 of the NC console 13 serves as an angle / D value conversion processing unit that converts the temporary bending angle into a D value corresponding thereto. Although the present invention is applied to an NC apparatus having a function, the present invention is not limited to this. For example, the present invention can also be applied to an NC apparatus having a structure in which an operator directly inputs a D value.
[0107]
In the above embodiment, the workpiece is bent to the target bending angle by the NC device and then driven to the target angle. However, the present invention is not limited to this. For example, the NC device is bent from the beginning to the target angle. You may comprise as follows. In that case, even if the bending angle of the workpiece is deviated from the target angle, the amount of springback can be obtained by taking the difference from the bending angle when the workpiece is in an unloaded state.
[0108]
In the above-described embodiment, the present invention is applied to a bending machine provided with an NC device. However, the present invention is not limited to this. For example, the present invention can also be applied to a bending machine that bends with a handle.
[0109]
Furthermore, in the above embodiment, the table raising type press brake is exemplified as the bending machine, but the invention is not limited to this, and for example, it is applied to various bending machines including a table lowering type press brake. It is possible.
[0110]
【The invention's effect】
As described above, the present invention includes a step of collecting a springback amount in advance, a step of obtaining a target pressure angle in which the springback amount is woven into the target angle based on the target angle and the springback amount, and a bending machine. Bending the workpiece to near the temporary bending angle, which is sweeter than the target angle, a driving step for driving the workpiece to the target pressurization angle after the temporary bending is completed, a step for measuring the bending angle of the workpiece during the driving operation, and angle measurement Since the process consists of a process of displaying the value for use by the operator, once the work is attached to the bending machine and the bending process is started, the operator can measure the angle without removing the work from the bending machine. There is an effect that you can drive to the end while watching the display.
[0111]
The present invention also includes a step of collecting a springback amount in advance, a step of providing an angle control means, setting a target angle and a springback amount in the angle control means, and a target incorporating the springback amount in the target angle. A step of obtaining a pressurizing angle, a step of setting a D value corresponding to a temporary bending angle that is sweeter than a target angle in the NC device, a step of bending the workpiece to the vicinity of the temporary bending angle by the NC device, Based on the step of measuring the bending angle and the angle error between the angle measurement value and the target pressurization angle, the angle control means transfers the number of pulses necessary for the NC device to execute the automatic driving operation, thereby targeting the workpiece. Since it has a structure that includes a rushing process for pushing up to the pressurization angle, once the work is attached to the bending machine and bending is started, the work is removed from the bending machine. There is an effect that can be trumps automatically to the last not a Rihazusa.
[0112]
The present invention also includes a step of collecting a springback amount in advance, a step of providing an angle control means, setting a target angle and a springback amount in the angle control means, and a target incorporating the springback amount in the target angle. The step of obtaining the pressurization angle, the step of setting a D value corresponding to a temporary bending angle that is sweeter than the target angle in the NC device, the step of bending the workpiece to the vicinity of the temporary bending angle by the NC device, and the generation of a pulse after the end of the temporary bending During the process of driving the workpiece to the target pressure angle by generating a pulse by operating the instrument, and during the driving operation, the angle control means measures the bending angle of the workpiece and displays it for use by the operator. After the work is temporarily attached to the bending machine and the bending process is started, the operator bends the work. Without removing from Koki, by operating the pulse generator while viewing the display of the angular measurements, there is an effect that can be herd manually workpiece to the end.
[0113]
Further, the present invention corresponds to an operation means for setting a target angle and a pre-collected springback amount, a control means for obtaining a target pressurization angle by incorporating the springback amount into the target angle, and a provisional bending angle that is sweeter than the target angle. A pulse generating means for generating a number of pulses required to cause the NC apparatus to perform an automatic driving operation for driving the workpiece to a target pressurizing angle following the temporary bending by the NC apparatus in which the D value is set; The NC apparatus is configured to include an angle measuring means for measuring the bending angle of the workpiece and a means for displaying the angle measurement value for use by the operator while the NC apparatus is performing an automatic driving operation by a pulse transferred from the machine. Once it is installed on the processing machine and the bending process is started, the operator does not remove the workpiece from the bending machine. There is an effect that can be trumps automatically the work until the last while watching the display of degree measurements.
[0114]
Further, the present invention corresponds to an operation means for setting a target angle and a pre-collected springback amount, a control means for obtaining a target pressurization angle by incorporating the springback amount into the target angle, and a provisional bending angle that is sweeter than the target angle. The angle measuring means for measuring the bending angle of the workpiece during the manual driving operation for driving the workpiece to the target pressurization angle by operating the pulse generator following the temporary bending by the NC device in which the D value is set, and the angle measurement value After the work is temporarily attached to the bending machine and bending is started, the operator can display the angle measurement value without removing the work from the bending machine. By operating the pulse generator while looking at the workpiece, there is an effect that the workpiece can be driven manually to the end.
[0115]
Further, the present invention provides a pulse generator for manual driving, an operation means for setting a target angle and a pre-collected springback amount, a control means for obtaining a target pressurization angle incorporating the springback amount into the target angle, Following the temporary bending by the automatic generating pulse generating means and the NC device in which the D value corresponding to the temporary bending angle that is less than the target angle is set, the NC device moves the workpiece to the target pressurizing angle based on the applied pulse. During the driving-in operation, the angle measuring means for measuring the bending angle of the workpiece, the means for displaying the angle measurement value for use by the operator, and the pulse generating source applied to the NC apparatus are the pulse generator or the pulse generating means. Switching means for switching to any of the above, and configured to be connectable to the NC device via this switching means. After starting the temporarily attached bending down machine, the operator, without removing from the bending machine a workpiece, there is an effect that can herd to the end while viewing the display of the angle measurements.
[0116]
In addition, this bending angle control device is connected to the NC device via a switching means for switching between a pulse generator used when the operator manually drives in and a pulse generating means used in the automatic driving operation. Can be easily connected to an NC device, and therefore can be easily retrofitted to a bending machine equipped with an existing NC device. As a result, it is extremely suitable as a retrofitting bending angle control device. There is.
[Brief description of the drawings]
FIG. 1 is a perspective view of a bending machine to which a bending angle control device is attached.
FIG. 2 is a perspective view of a sensor unit.
FIG. 3 is an explanatory diagram of the principle of angle measurement 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 bending angle control device.
FIG. 6 is a flowchart showing the operation of the bending angle control 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 a manual driving mode.
FIG. 11 is a flowchart for confirming that a workpiece according to a target angle has been obtained.
FIG. 12 is a flowchart for obtaining springback.
[Explanation of symbols]
1 Bending machine (press brake)
3 Upper table
5 Punch
7 Lower table
9 die
11 NC control box
13 NC console
15 Operation unit
17 Input / output section
19 Control section
21 Hand Pulser
23 Foot pedal
31 Bending indicator (BI)
41 Sensor unit
43 Guide rail
45 Mobile
47 Lifting body
49 Sensor support
51 Sensor head
53 Floodlight
55a, 55b Optical sensor
57 Stepping motor
59 Rotary encoder
61 Mode selector switch
71 DigiPro (digital protector)
73 Reference plane
75 Measuring surface
77 Display
81 Operation unit
83 keyboard
85 Display
87 Process display
89 Data display section
91 BI control unit
93 Control section
95 I / O section
96 Pulse generator
97 selector
99 buzzer

Claims (4)

In bending machine equipped with NC device,
A step of collecting a springback amount in advance;
Providing an angle control means, and setting a target angle and a springback amount in the angle control means;
Obtaining a target pressurization angle that incorporates a springback amount into the target angle;
Setting a D value corresponding to a temporary bending angle that is sweeter than the target angle in the NC device;
Bending the workpiece to near the temporary bending angle by the NC device;
Measuring the bending angle of the workpiece at the end of provisional bending;
Based on the angle error between the angle measurement value and the target pressurizing angle, the angle control means transfers the number of pulses necessary to cause the NC device to execute the automatic driving operation, and drives the workpiece to the target pressing angle. Have
In the driving step, first, a predetermined number of pulses (initial pulses) as initial values are transferred to the NC device to execute the initial driving operation, and when the initial pulse is generated, the bending angle of the workpiece is measured. The D value per pulse is calculated from the angle measurement value and the number of the initial pulses, and the remaining D value is calculated based on the D value per pulse, and corresponds to the obtained remaining D value. A bending angle control method in a bending machine, wherein a number of pulses are transferred to an NC device. In bending machine equipped with NC device,
A step of collecting a springback amount in advance;
Providing an angle control means, and setting a target angle and a springback amount in the angle control means;
Obtaining a target pressurization angle that incorporates a springback amount into the target angle;
Setting a D value corresponding to a temporary bending angle that is sweeter than the target angle in the NC device;
Bending the workpiece to near the temporary bending angle by the NC device;
Measuring the bending angle of the workpiece at the end of provisional bending;
Based on the angle error between the angle measurement value and the target pressurizing angle, the angle control means transfers the number of pulses necessary to cause the NC device to execute the automatic driving operation, and drives the workpiece to the target pressing angle. Have
The driving-in step is
Transferring a predetermined number of pulses as an initial value to the NC device to execute an initial driving operation;
Measuring the bending angle of the workpiece at the end of the initial driving operation;
Obtaining a D value per pulse from the angle measurement value at the end of the initial driving operation and the number of pulses of the initial value, and obtaining the remaining D value based thereon;
A bending angle in a bending machine comprising: a step of transferring the number of pulses corresponding to the obtained remaining D value to the NC device to perform the remaining driving operation for driving the workpiece to the target pressurizing angle. Control method. In bending machine equipped with NC device,
Operation means for setting a target angle and a pre-collected springback amount;
A control means for obtaining a target pressurization angle in which a springback amount is incorporated into the target angle;
Generates as many pulses as necessary to cause the NC unit to perform an automatic driving operation to drive the workpiece to the target pressurization angle following the temporary bending by the NC device in which a D value corresponding to a temporary bending angle that is less than the target angle is set. Pulse generating means for
An angle measuring means for measuring a bending angle of the workpiece while the NC device is performing an automatic driving operation by a pulse transferred from the pulse generating means;
Means for displaying the angle measurements for the operator,
The pulse generation means first generates a predetermined number of pulses (initial pulse) as an initial value by the control means, causes the NC device to execute an initial driving operation, and subsequently generates the initial pulse. The D value per pulse is calculated by the control means from the measured value of the bending angle of the workpiece and the number of the initial pulses measured after the end of the measurement, and the remaining D value is calculated based on the D value per pulse. A bending angle control device in a bending machine, wherein the number of pulses corresponding to the calculated remaining D value is generated and the NC device is configured to execute the remaining driving operation. In a bending machine equipped with an NC device and a pulse generator for manual driving,
Operation means for setting a target angle and a pre-collected springback amount;
A control means for obtaining a target pressurization angle in which a springback amount is incorporated into the target angle;
A pulse generating means for automatic driving;
The bending angle of the workpiece during the follow-up operation in which the NC device drives the workpiece to the target pressurization angle based on the applied pulse following the temporary bending by the NC device in which the D value corresponding to the provisional bending angle that is less than the target angle is set. Angle measuring means for measuring
Means for displaying the angle measurements to provide to the operator;
Switching means for switching a pulse generation source applied to the NC device to either the pulse generator or the pulse generation means;
It is configured to be connectable to the NC device through this switching means,
The pulse generation means first generates a predetermined number of pulses (initial pulse) as an initial value by the control means, causes the NC device to execute an initial driving operation, and subsequently generates the initial pulse. The D value per pulse is calculated by the control means from the measured value of the bending angle of the workpiece and the number of the initial pulses measured after the end of the measurement, and the remaining D value is calculated based on the D value per pulse. A bending angle control device in a bending machine, wherein the number of pulses corresponding to the calculated remaining D value is generated and the NC device is configured to execute the remaining driving operation.

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