JP2000051951A - Bending machine, method and device for bend angle measuring in bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a precise bend angle of a work in a high precision by approaching a angle detection head to the bend part of the work and positioning it even for the work of a various bend shape. SOLUTION: While oscillating an angle detection head 9 arranged with a light emitting part and a pair of light receiving part, a laser beam is irradiated from the emitting part against the bend face of a work bend with a punch/die of a bending machine, its reflected beam is received by a pair of the light receiving part, the bend angle at the bend part of the work is obtained from a peak value of the light receiving quantity received by each light receiving part. In such a case, by making an angle detection head 29 movable in parallel (X direction) to the die as well as horizontally movable in the direction (Y direction) approaching/departing for the work, further vertically movable in the direction (Z direction) of die elevating, the angle detection head 29 is positioned at an angle measuring position, the bend angle is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending machine, a method for measuring a bending angle in a bending machine, and a bending angle measuring device, and more particularly, to detecting an angle in a portion suitable for measuring a bending angle. The present invention relates to a bending machine capable of measuring an accurate bending angle by moving and positioning a head, a bending angle measuring method in the bending machine, and a bending angle measuring device.

[0002]

2. Description of the Related Art A so-called non-contact method for measuring a bending angle by irradiating a laser beam to a work bent by a bending machine and detecting a return light thereof, and a so-called non-contact bending angle measuring method. A measuring device has been proposed by the present applicant.

FIG. 15 shows an example of a non-contact bending angle measuring device proposed by the present applicant. As shown in FIG. 15, the bending angle measuring device 507 includes a punch P provided on the upper table 501 and a lower table 503.
Is provided in a bending machine 505 that bends the work W to a desired angle in cooperation with the die D provided in the work piece D. The measurement can be performed immediately after the bending work without taking out the work W from the bending machine 505. It has been made possible.

[0004] Such a bending angle measuring device 507 is shown in FIG.
As shown in FIG. 5 and FIG. 16, a bracket 511 movable on a front surface of the lower table 503 along a guide rail 509 disposed in parallel with the die D, and a detection head 513 attached to the bracket 511 include: It is configured. As shown in FIG. 16, the detection head 513 irradiates a laser beam toward the work W,
A pair of light receivers for receiving the light reflected from the work W is provided, and is swingable with a certain angular range in the vertical direction about the rotation center Po.

That is, the detection head 513 is configured as shown in FIG.
As shown in FIG. 7, it is configured to swing by a stepping motor 519 attached to the same shaft 517. An encoder 521 is attached to the shaft 517 on the opposite side of the stepping motor 519 from the detection head 513.

In the bending angle measuring device 507, the detection head 513 is swung up and down while irradiating the work W with laser light from the light emitter, and the peak value or peak waveform of the amount of light received by the pair of light receivers. The bending angle of the workpiece W is detected from the rotation angle of the detection head 513 corresponding to the position of the center of gravity obtained from the area of the work W. Specifically, the bending angle 2.theta.
As shown in the figure, the peak values θ1 and θ2 when the reflected light is received by the pair of light receivers are measured, and the peak values θ1 and θ2 are obtained from the peak values θ1 and θ2. That is, the bending angle is obtained as 2θ = (θ1 + θ2). Note that FIG. 18 shows a case where the bending angle is 90 degrees, the horizontal axis represents the angle by the encoder 521, and the vertical axis represents the amount of received light.

[0007]

By the way, the shapes of the workpieces W to be bent are various, such as different bending widths, and the bending angles are wide from acute angles to obtuse angles. In order to measure the angle, it is necessary to bring the angle detection head 513 closer to the bent portion as much as possible. In other words, the further to the end of the bent side, the more the work W
The bending angle is not intended to be large due to the effect of sagging or bending of the wire. Therefore, measuring the angle of the bent portion is the most reliable.

[0008] However, the angle detecting head 513 having the above-described structure is used.
Is swung up and down around the point Po with respect to the work W, and is only movable parallel to the die D along the guide rail 509. Therefore, the work W bent at an acute angle or The angle detection head 513 cannot approach the bent portion for the work W that has been bent. In particular, the work W that interferes with the angle detection head 513
In the case of a workpiece W having a hole or a molded product, it is difficult to set the angle detection head 513 at a predetermined angle detection position only by moving the angle detection head 513 in parallel with the die D. Therefore, the bending angle measuring device 507 having the above configuration cannot detect an accurate bending angle.

[0009]

In order to accurately detect the bending angles of variously shaped workpieces having different bending widths, for example, an angle detection head is provided at the bent part of the workpiece. Therefore, in the present invention, in addition to swinging the angle detection head and moving in the direction along the bending line of the work, in the present invention, the angle detection head is movable in the direction approaching or separating from the work, and It is free to move in a direction orthogonal to both the moving directions. That is, in addition to swinging the angle detection head around the axis, the above problem is solved by allowing the angle detection head to freely move in four axial directions of the X, Y, and Z directions.

As described above, by making the angle detection head movable in the four axial directions, the angle detection head can be brought closer to the bent portion even for variously bent workpieces. Thus, the bending angle of the work can be detected with high accuracy.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.
In the present embodiment, a press brake is used as a bending machine, and the present invention is applied to the press brake.

<Structure of Bending Machine> First, the structure of a bending machine will be briefly described with reference to FIG. FIG.
Is a press brake that linearly bends a long plate, and is configured to bend a work set on the die D into a desired shape by cooperation of a punch P and a die D. It is a thing.

The punch P is a main frame 3 having a C shape.
Is exchangeably mounted on the lower end of an upper table 5 provided on the upper front surface of the upper table. The punch P is held by a plurality of punch holders 7 so that the replacement operation can be easily performed, and is detachable with one touch.

On the other hand, the die D is exchangeably mounted on the upper end of a lower table 9 provided on the lower front surface of the main frame 3. Similarly, the die D is held by the die holder 11 so that the exchange operation can be easily performed, and is also detachable with one touch.

The bending machine 1 includes a control box 13
The driving is controlled by an NC control unit accommodated in the controller, and either the automatic operation or the manual operation is selected for operation. A pendant operation box 15 provided with a monitor and various input buttons is connected to the NC control unit so that various information related to bending can be input in the pendant operation box 15 or a work shape or the like can be displayed. It has become. And this NC
Based on a command from the control unit, the die D is raised and the work set on the die D is bent into a desired shape in cooperation with the punch P.

<Schematic configuration of bending angle measuring device>
A bending angle measuring device provided in the bending machine 1 will be described. The bending angle measuring device 17 is a non-contact type that measures the bending angle of the work by irradiating the work bent by the bending machine 1 with a laser beam as a measuring light and detecting a return light thereof. Is an indicator for detecting the angle of the camera.

As shown in FIG. 1, the bending angle measuring device 17 is arranged in parallel with the die D along a guide rail 19 provided on the upper surface of the lower table 9 in the longitudinal direction of the die D. It is provided movably in the left-right direction (X direction) in FIG. Then, the bending angle measuring device 17
Is connected to an operation panel 21 for visually displaying the measured bending angle as a digital display to an operator or a manager by visual observation. The operation panel 21 and the bending angle measuring device 17 are connected by a cable 23, and a cable guide 25 formed by sheet metal on the lower end of the front surface of the lower table 9 so that the cable 23 does not interfere. The cable 23 is accommodated therein.

The operation panel 21 is provided with a display section for displaying a bending angle and the like and various input buttons. The operation panel 21 is used to input various data such as a target bending angle and a bending process. It has become. The various data are transferred to the NC control unit connected to the operation panel 21. The operation panel 21 is connected to a so-called finished angle detection digital retractor 27 that measures a bending angle by hitting a bent portion of an actually bent work.

<Detailed description of bending angle measuring device>
The bending angle measuring device 17 will be described in more detail. As shown in FIG. 2, the bending angle measuring device 17 makes the angle detection head 29 swingable with a predetermined swing angle in the M direction which is the direction in which the bending side of the workpiece jumps, and As described above, it is possible to move freely in the X direction (in other words, the direction along the bending line of the work) in parallel with the die D, and to be able to move horizontally in the Y direction which is a direction to approach or separate from the work. Further, the die D is configured to be vertically movable in a Z direction (in other words, a direction orthogonal to the X and Y directions) in which the die D moves up and down. That is, in the present embodiment, the angle detection head 29 is movable in four directions of X, Y, Z, and M.

As shown in FIGS. 2 to 5, the bending angle measuring device 17 includes a first slide member 31 which makes the angle detecting head 29 movable in the X direction and the Z direction, respectively.
And a second to make the angle detection head 29 movable in the Y direction.
It is composed of a slide member 33 and a swing mechanism for swinging the angle detection head 29 in the M direction.

[Structure of First Slide Member] The first slide member 31 is disposed in parallel with the die D as shown in the detailed structural perspective views of FIGS. 6 and 7 from which the cover 35 shown in FIG. 2 is removed. X slider 37 movably provided along the set guide rail 19, and a base block 53 movably orthogonal to the moving direction of the X slider 37.
And The X slider 37 is a guide rail 1
9 slidably mounted along the die 9 and travels in parallel with the die D, thereby making the angle detection head 29 movable in the X direction.

The base block 53 is shown in FIGS.
As shown in the figure, the block is formed as an inverted L-shaped block, and has a spring seat 39 described later on its lower end side. A column 43 is provided on the base block 53 so as to stand upright in the vertical direction. A scale 45 (see FIG. 4) is provided on the side surface of the column 43 to check how much the angle detection head 29 has moved in the Z direction. 3) is attached. As shown in FIG. 3, the scale of the scale 45 can be read by a pointer 47 attached to a side surface of the intermediate plate 41 fixed to the X slider 37.

The base block 53 is provided with a lifting mechanism for moving the angle detecting head 29 in the Z direction. The lifting / lowering mechanism section includes the intermediate plate 41.
And a rail guide 49 fixed to the rail guide 4
9 and a rail 51 to be engaged and guided. The rail guide 49 is disposed so that the longitudinal direction of the rail guide 49 is perpendicular to the intermediate plate 41. The rail 51 is fixed to one main surface of a vertical portion of the base block 53. For this reason, the base block 53 is movable in the Z direction along the rail guide 49.

FIGS. 6 and 7 show the spring seat 39.
As shown in FIG. 7, a coil spring 55, a rack 57, and a stopper 59 are provided to make the base block 53 freely move up and down in steps. The coil spring 55 is provided between the arm member 61 attached to the back surface of the base block 53 and the spring seat 39, and urges the base block 53 to always lift upward. The coil spring 55 is mounted on the outer periphery of a cylindrical spring support member 63 fixed to the spring seat 39 to support the base end thereof, and a circular hole (not shown) formed in the lower end surface of the arm member 61. ) Is inserted and supported at the front end so that the entire body is supported without breaking.

The rack 57 is fixed to a vertical surface of the arm member 61 with its longitudinal direction oriented in the Z direction. A stopper 59 that engages with the rack 57 to position and fix the height position of the base block 53 is provided on a stopper mounting block 65 fixed to the tip of the arm member 61. The stopper 59 is engaged with the saw blade of the rack 57, and
Is positioned and fixed stepwise.

The stopper 59 is always urged to engage with the rack 57 by a spring (not shown) built in the stopper mounting block 65. In order to release the engagement between the stopper 59 and the rack 57, the disk-shaped knob 67 movably provided on the stopper mounting block 65 is released by moving in the direction of arrow A in FIG.

In addition, the base block 53 includes
As shown in FIG. 7, a board mounting stay 7 for mounting a pair of printed wiring boards 69 and 71 provided with a control circuit for driving and controlling an angle detection head 29, which will be described later, and electronic components and the like.
3 is screwed. Further, as shown in FIG. 7, a cover mounting stay 75 for mounting and supporting the cover 35 is fixed to the base block 53.

The cover mounting stay 75 includes:
A switch 77 is provided for switching between an automatic detection mode for automatically detecting the bending angle of the work W by the angle detection head 29 and a manual detection mode for manually detecting the bending angle.

As described above, by providing the switch 77 in the bending angle measuring device 17 itself, the above operation can be performed in front of the bending machine 1 without the operator having to go to the bending box 15. Therefore, workability can be improved.

As described above, since the first slide member 31 is configured to be movable in the X direction in parallel with the die D,
By moving the angle detection head 29 to a predetermined measurement position, the bending angle at each position can be detected. Accordingly, for example, in the case of a long workpiece W as shown in FIG. 12, the bending angle is not always the same over the entire area in the longitudinal direction. 29 can be moved to a desired measurement position. Further, since the bending shape is not limited to the V-shape but various shapes, the bending angle measuring device 17 can be freely moved to the measurement position of the work W according to the different shape. I have.

Further, since the first slide member 31 can be moved up and down in the vertical direction which is the Z direction, the work W having different bending angles (having different bending side heights) as shown in FIG. Even when measuring bending angles,
The angle detection head 29 can be measured close to the bent portion.

[Structure of Second Slide Member 33] The second slide member 33 has a work W as shown in the detailed configuration perspective views of FIGS. 6 and 7 with the cover 79 shown in FIG. 2 removed.
A rail guide 81 disposed in a direction (Y direction orthogonal to the direction in which the die D is disposed) with respect to the rail 8 and a rail 8 movable along the rail guide 81.
3 and a Y slider 85 which is a base having a notch 99 fixed to the rail 83. This Y
The slider 85 runs perpendicular to the die D by being slidably attached along the rail guide 81, and makes the angle detection head 29 movable in the Y direction.

The rail guide 81 is, as shown in FIG.
The rail 83 is slidably fixed to an upper end surface of a support base 87 fixed to a top surface portion of the base block 53. A pair of cover mounting stays 89 and 91 for mounting the cover 79 are mounted on both sides of the Y slider 85 fixed to the rail 83 with the Y slider 85 interposed therebetween.

As shown in FIGS. 6 and 7, the Y slider 85 is provided with a rack 93 and a stopper 95 for making the Y slider 85 freely movable in a stepwise manner. The rack 93 is fixed on a rack support member 97 fixed to the side surface of the support base 87, and the rail guide 8
1 and are arranged in parallel. A stopper 95 that engages with the rack 93 to position and fix the sliding position of the Y slider 85 is provided on a stopper mounting block 103 that is mounted on the Y slider 85 via a connecting plate 101.

The stopper 95 engages with the saw blade of the rack 93 to position and fix the sliding position of the Y slider 85 stepwise. The stopper 93 is formed by a spring (not shown) built in the stopper mounting block 103.
It is always urged to engage with the rack 95.
In order to release the engagement between the stopper 95 and the rack 93, the disk-shaped knob 105 provided on the stopper mounting block 103 is released by moving in the direction of arrow B in FIG.

As described above, since the second slide member 33 is movable in the Y direction, the angle detecting head 29 is moved from the position shown by the dotted line to the bent portion of the work W shown by the solid line as shown in FIG. Can be approached. As described above, by configuring the angle detection head 29 to be swingable in the M direction and movable in the four directions of the X direction, the Y direction, and the Z axis direction, the workpiece W having various bent shapes is formed. Therefore, the angle detection head 29 can be brought close to the bent portion of the work W, and an accurate bending angle can be detected.

[Structure of swing mechanism] Angle detection head 29
FIGS. 6 and 7 show a swinging mechanism that allows the swinging mechanism to swing freely in the M direction.
As shown in (1), it comprises a drive motor 107 as a drive unit and an encoder 109. Drive motor 1
07 is composed of, for example, a stepping motor,
The slider 85 is fixed to a head mounting portion 111 on the distal end side where the thickness of the slider 85 is reduced. The angle detection head 29 is attached to the drive shaft of the drive motor 107.

The angle detection head 29 can be swung about a drive shaft as a rotation center at a desired angle by the drive motor 107. The encoder 109 is
The rotary encoder is a rotary encoder that sequentially detects a rotation angle when the angle detection head 29 is swung, and is attached to a head attachment portion 111 on a side opposite to a side where the drive motor 107 is provided.

[Structure of Angle Detecting Head] As shown in FIG. 8, the angle detecting head 29 includes a laser projector 113 as a light emitting section, a first light receiving section 115 as a pair of light receiving sections, and a second light receiving section.
And a light receiver 117. The laser projector 113 is
The sensor body 119 is formed of a semiconductor laser that irradiates a laser beam toward the work W, and is provided so as to be embedded in a substantially central portion of a rectangular sensor body 119.

The first light receiver 115 and the second light receiver 117
Is composed of, for example, a photodiode, and is provided above and below the angle detection head 29 so as to be embedded so that the lens is not exposed to the outside. The first light receiver 115 and the second light receiver 117 are provided at the same distance from the laser projector 113 so that the amount of reflected light received by each of them is the same.

The first light receiver 115 and the second light receiver 1
17 is a laser projector 1 in order to easily receive laser light reflected from the surface of the work W from the front.
Thirteen irradiation axes LBC are provided to be inclined. The arrangement angle β of the first light receiver 115 and the second light receiver 117 with respect to the irradiation axis LBC is the angle detection head 29
For example, it is preferably about 10 degrees although it depends on the distance between the workpiece W and the workpiece W.

The angle detection head 29 having the above-described configuration is used only when the work W
Can be detected, and the measurement cannot be performed if the distance from the workpiece W is not correct. In the present embodiment, although it differs depending on the reflectance of the material of the work W, the facing distance between the angle detection head 29 and the work W can be correctly read between 35 and 75 mm.

[Principle of Detecting Bending Angle of Work] The principle of detecting the bending angle of the work W by the angle detection head 29 having the above configuration will be described with reference to FIGS. 9 and 10.

The laser beam LB emitted from the laser projector 113 of the oscillating angle detecting head 29 is reflected by the surface of the work W and received by the first light receiver 115 or the second light receiver 117 as shown in FIG. Is done. At this time, the rotation angle of the angle detection head 29 is determined by the encoder 109.
Is detected by

For example, as shown in FIG. 9, when the angle detection head 29 is rotated from the position shown by the two-dot chain line to the position indicated by the solid line at the angle θ1, the inclination angle of the second light receiver 117 reflects the reflection from the work W. Since the light reaches the second light receiver 117 near the angle of light and is received, the NC control unit clearly recognizes the peak of the reflected light amount without being affected by the irregularly reflected light from the surface of the work W. Can be. The same applies to the first light receiver 115.

FIG. 10 shows the change in the amount of received light with respect to the rotation angle of the angle detection head 29. Generally, the rotation angle of the angle detecting head 29 is equal to the reference angle θ (θ in FIG. 10).
= Zero degree), the amount of light received by the first light receiver 115 is maximized when rotated in the counterclockwise direction by the angle θ1, and the rotation angle of the angle detection head 29 becomes larger than the reference angle θ. It can be seen that the amount of light received by the second light receiver 117 is maximized when rotated clockwise by the angle θ2.

The first light receiver 115 and the second light receiver 11
7 is provided at the same distance from the laser projector 113, the rotation angle θ1 of the angle detection head 29 when the amount of light received by the first light receiver 115 is maximized in FIG. It can be seen that the laser beam LB from the laser projector 113 is projected perpendicularly to the work W at an intermediate position with the rotation angle θ2 of the angle detection head 29 when the amount becomes maximum. Thus, the angle 2θ of the bent work W is obtained from the following equation (1).

2θ = θ1 + θ2 Equation (1) <Bending Angle Measuring Method> Next, using the bending angle measuring device 17 configured as described above, bending is performed by the bending machine 1 described above. A method of measuring the bending angle of the work W thus performed will be described.

First, the origin of the angle detecting head 29 is determined. That is, a magnet seal (not shown) is attached to the side of the die facing the angle detection head 29. Then, the first slide member 31 is moved in the X and Z directions, and the second slide member 33 is moved in the Y direction, so that the angle detection head 29 is moved to a position facing the magnet seal. Then, the operation panel 2 described above
The origin button of the angle detection head 29 is set by pressing the origin button provided in the first position. At that time, the laser projector 113
When the emitted laser light protrudes from the magnet seal, the height of the angle detection head 29 and the distance between the die D are adjusted, and then the origin is again determined.

Next, various processing data such as the thickness and the bending angle of the work W are input to the NC control unit, and the work W is bent by the bending machine 1 so as to have a target bending angle. After the bending of the work W is completed, the bending angle measuring device 17 that has been evacuated away from the bending position is moved to the measurement position of the work W along the guide rail 19 arranged in parallel with the die D. Move. Next, the angle detecting head 29 is moved and adjusted in each of the Z direction and the Y direction by pulling the respective knobs 67 and 105 of the bending angle measuring device 17, and the angle detecting head 29 is moved to the position shown in FIG.
As shown in FIG. 1, the work W is brought closer to the bent portion (bent portion). By arranging the angle detection head 29 at the bent portion of the work W in this manner, the influence of the bending of the work W is reduced, and a more accurate bending angle can be measured.

Next, when the angle detecting head 29 is set at a predetermined measuring position, the laser light is folded by the laser projector 113 from the laser projector 113 while the angle detecting head 29 is swung at a desired swing angle by the drive motor 107. Irradiate toward the bent surface. The amount of light received by the first light receiver 115 and the second light receiver 117 is converted into an electric signal and transferred to the NC control unit, and the rotation angle of the angle detection head 29 is detected by the encoder 109, and the detection result is similarly calculated. Transfer to NC control unit.

The NC control unit obtains θ1 and θ2 from the waveform diagram of the sensor output (light reception amount) and the rotation angle shown in FIG. 10 described above, and calculates the bending angle of the work W by the above equation (1). . The obtained bending angle 2θ is digitally displayed on the display section of the operation panel 21 so that the operator can immediately identify it by visual observation. When the bending angle is not the target angle, the work W is bent again by the bending machine 1. When the bending angle is the target angle, the workpiece W is taken out of the die D after the bending angle measuring device 17 is retracted. Then, the above-described digital retractor 27 is applied to the bent portion of the work W, and the actual bending angle is measured.

As described above, in addition to swinging the angle detection head 29 in the M direction, the work W can be folded in such a manner that the angle detection head 29 can be freely moved in the four directions of the X direction, the Y direction and the Z direction. The angle detection head 29 can be moved and positioned at a portion near the bent portion, and the bending angle of the work W can be measured with high accuracy. In addition, the angle detection head can be applied to a variety of bent shapes such as a work W bent at an acute angle, a work W bent in a complicated manner, or a work W having a hole or a molded product. 29 can be brought close to the bent portion, and the bending angle of the work W can be detected with high accuracy.

<Other Embodiments> Specific embodiments to which the present invention is applied have been described above. However, the present invention can be variously modified without being limited to the above-described embodiments.

In the above-described embodiment, the upper table 5 on which the punch P is mounted is fixed, and the lower table 9 on which the die D is mounted is moved up and down. Conversely, the lower table 9 is fixed and the upper table 5 is fixed. The same effect can be obtained by applying the present invention to a press brake that moves the table 5 up and down. Further, in the above-described embodiment, laser light is used as the measurement light. However, the work may be irradiated with light obtained by focusing ordinary visible light with a lens or the like.

In the above embodiment, the operator moves the first slide member 31 and the second slide member 33 to the measurement position of the work W manually to position the angle detection head 29. The operation can be automatically performed by the NC control unit.

In order to perform automatic control, the first slide member 31 and the second slide member 3 are required as in the above embodiment.
3 (positioning of the angle detection head 29 in the Y and Z directions) by the racks 57 and 93 and the stoppers 59 and 95
Instead, the rails 51 and 83 may be slid steplessly by the feed screw of the drive motor, or may be slid steplessly by the linear motor to apply the brake. In order to move the angle detection head 29 in the X direction, the angle detection head 29 is driven by a motor having the same configuration (a feed screw or a linear motor).

Then, each motor (including a linear motor) that makes the angle detection head 29 movable in each of the X, Y, and Z directions is controlled and driven by the NC control unit. Thus, the angle detection head 29
In addition to the swinging motion in the M direction, can be made freely movable in four directions including the X direction, the Y direction, and the Z direction, so that it is most suitable for measuring the bending angle of the workpiece W. The angle detection head 29 can be positioned at the measurement position. In addition, since angle detection can be performed without manual operation by an operator, the measurement time of the bending angle can be significantly reduced.

[0059]

The present invention is embodied in the form described above and has the following effects.

According to the bending machine of the present invention, since the lower table which can be moved up and down is provided with the angle detecting head which can be moved in four axial directions, the work is taken out from the bending machine. Without measuring the bending angle, the angle detection head can be positioned at a predetermined angle measurement position by bringing the angle detection head close to the bent portion of the work immediately after the bending process is completed.

According to the bending angle measuring method of the present invention, since the angle detecting head is freely movable in four axis directions and positioned at the angle measuring position of the work, the bending angle is measured. It is possible to measure the bending angle at the bent part of the part that is not affected by bending etc.
The bending angle of the work can be detected with high accuracy.

On the other hand, according to the bending angle measuring device of the present invention, in addition to swinging the angle detecting head,
Since it is movable in each direction of the Y direction and the Z direction, that is, in four axial directions, the angle detection head can be moved and positioned at a portion close to the bent portion, and a work or an acute angle which interferes with the angle detection head can be made. The angle detection head can be brought close to the bent portion even for a work having a variety of bent shapes, such as a bent work or a work having a hole or a molded product, and the bending angle of the work can be obtained. Can be detected with high accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bending machine equipped with a bending angle measuring device movable in four axial directions.

FIG. 2 is a perspective view of a bending angle measuring device.

FIG. 3 is a side view of the bending angle measuring device.

FIG. 4 is a plan view of a bending angle measuring device.

FIG. 5 is a front view of the bending angle measuring device.

FIG. 6 is a perspective view showing the bending angle measuring device with the cover removed, as viewed from the back side of the bending machine.

FIG. 7 is a perspective view showing the bending angle measuring device with the cover removed, as viewed from the front side of the bending machine.

FIG. 8 is an enlarged sectional view of the angle detection head.

FIG. 9 is an explanatory diagram showing a principle of measuring a bending angle by an angle detection head.

FIG. 10 is a graph showing a principle of measuring a bending angle by an angle detection head.

FIG. 11 is a side view showing a state where the bending angle of the work is measured by the bending angle measuring device.

FIG. 12 shows an angle detection head X for a long workpiece.
It is a perspective view showing the state where it is made to move in the direction.

FIG. 13 is a side view showing a state where the angle detection head can be moved up and down in the Z direction with respect to works having different bending heights.

FIG. 14 is a side view showing a state in which the angle detection head is moved in the Y direction.

FIG. 15 is a front view of a bending machine equipped with a conventional bending angle measuring device.

FIG. 16 is a side view showing a state where a bending angle of a work is measured by a conventional bending angle measuring device.

FIG. 17 is a perspective view of an angle detection head.

FIG. 18 is a characteristic diagram showing a relationship between a light reception amount detected by an angle detection head provided in a conventional bending angle measuring device and a rotation angle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending machine 17 Bending angle measuring device 19 Guide rail 21 Operation panel 29 Angle detection head 31 First slide member 33 Second slide member 37 X slider 51, 83 Rail 57, 93 Rack 59, 95 Stopper 107 Drive motor 109 encoder

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA33 CC10 DD03 FF17 FF43 FF66 GG06 JJ05 JJ18 JJ23 LL04 LL65 MM08 PP04 PP05 PP22 QQ28 QQ29 4E063 AA01 BA07 FA05 GA02 GA03 GA05 JA07 KA07 LA08 5F072 AB13 JJ13J06

Claims (4)

[Claims] 1. A punch attached to one table and a die attached to the other table corresponding to one of the tables. In a bending machine configured to bend a work at a predetermined bending angle by means of a punch, a surface close to a bending position of the work is irradiated with measurement light, and the work is determined based on a peak value of a received light amount of reflected light. An angle detection head that measures the bending angle at the bent portion of the work, while freely movable in the direction along the bending line of the work,
A bending machine characterized by being movable in a direction approaching or separating from the work, and movable in a direction orthogonal to the both moving directions. 2. The method according to claim 1, further comprising: swinging an angle detection head having a light emitting section and a pair of light receiving sections, and moving the angle detecting head closer to a bending position of the work bent by the punch and the die of the bending machine from the light emitting section. When irradiating the measurement light toward the surface, the reflected light is received by the pair of light receiving portions, and when the bending angle in the bending portion of the work is obtained from the peak value of the amount of light received by each light receiving portion, The angle detection head is movable in a direction along a bending line of the work, and is movable in a direction approaching or moving away from the work, and is moved in a direction orthogonal to both the moving directions. A bending angle measuring method for a bending machine, wherein the bending angle is measured after positioning the angle detecting head at a predetermined angle measuring position of the work. 3. A method according to claim 1, further comprising: oscillating an angle detection head having a light-emitting portion and a pair of light-receiving portions, from the light-emitting portion to a position close to a bending position of a work bent by a punch and a die of a bending machine. A laser beam is directed toward the surface, and the reflected light is received by a pair of the light receiving portions, and a bending angle at the bending portion of the work is obtained from the peak value of the amount of light received by each light receiving portion. In a bending angle measuring device for a processing machine, the angle detection head is movable in a direction along a bending line of the work, and is movable in a direction approaching or moving away from the work, and A bending angle measuring device in a bending machine, wherein the bending angle measuring device is movable in a direction orthogonal to a moving direction. 4. A laser beam is applied to a surface of a work bent by a punch and a die of a bending machine, the surface being close to a bending position, and reflected light is received by a pair of light receiving units. A swingable angle detection head that calculates a bending angle at a bending portion from a peak value of the amount of light received by each light receiving unit; and a movable angle detection head that moves the angle detection head toward or away from the work. Means, means for moving the angle detection head in a direction along the bending line of the work, and means for moving the angle detection head in a direction orthogonal to both the moving directions. A bending angle measuring device in a bending machine.