JP2001058213A - Detection method for die, punch, bending angle and bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely detect a bending angle in a non-contact method and to improve a bending precision by arranging a reflection mirror reflecting a laser beam oscillated from a laser length measuring device in the direction orthogonal to the longitudinal direction of a die groove arranged near a slit communicating with the die groove or the bottom part of a hole. SOLUTION: Plural slits 37 communicating with a die groove DV are formed, a reflection mirror inclining at about 45 deg. is arranged. A laser length measuring device 41 movable in the Y axis, L axis, Z axis directions is arranged to a protrusion 25 of a back gage device 23. A laser beam LB oscillated from the laser length measuring device 41 is reflected by the reflection mirror 39 to irradiate a work W and is returned to the laser length measuring device 41 to detect the distance from the device to the side face of the work W. By moving/positioning the laser length measuring device 41 in the Z axis direction, plural distances up to both side faces of the work W are detected. By this method, a bending angle of the work W is precisely calculated by using the detected distance up to both side faces of the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die, a punch, a method for detecting a bending angle, and a bending machine for bending a plate-shaped work.

[0002]

2. Description of the Related Art FIG. 33 shows a bending angle detecting device for detecting a bending angle of a work when a plate-shaped work is bent in a press brake as a bending machine. As shown in FIG.
A laser length measuring device 203 is provided at the tip of the bracket 201. When the work W is bent in cooperation with the punch P and the die D,
The laser length measuring device 20 is attached to the side of the bent work W.
The laser beam LB from the laser measurement device 203 is irradiated from the 3 based on the distance to the side surface of the workpiece W the angle theta ₁ is measured, calculated from the from the angle theta ₁ of θ _{2 =} 90-θ ₁ Formula And θ = 2θ to determine the bending angle θ.

[0003]

By the way, as shown in FIG. 34, the frictional resistance of the shoulder portion of the die D and FIG.
36 (A) and (B), the bending angle between the front side and the rear side as shown in FIGS. 36 (A) and (B) due to the inclination of the punch P and the die D, etc. Are different.
Therefore, there is a problem that an error is large in the measurement on one side and an accurate bending angle cannot be detected.

In measurement at a plurality of points, it is necessary to provide a Y-axis moving means near the bent portion on the front side or the rear side, and there is a problem in workability.

It is an object of the present invention to provide a die, a punch, a bending angle detecting method and a bending machine which can accurately detect a bending angle at the time of bending in a non-contact manner and improve the bending accuracy. is there.

[0006]

According to a first aspect of the present invention, there is provided a die having a die groove for bending a plate-like work.
A slit or hole in a direction orthogonal to the longitudinal direction of the die groove is provided in communication with the die groove, and near the bottom of the slit or hole, laser light emitted from a laser length measuring device is directed in the die groove direction. The reflective surface is provided with an inclined reflecting surface that reflects light.

Therefore, the laser beam oscillated from the laser length measuring device is close to the bottom of a slit or hole provided in communication with the die groove in a direction perpendicular to the longitudinal direction of the die groove.
The light is reflected by the inclined reflecting surface and is irradiated to both side surfaces of the work. Then, by detecting the distance between both side surfaces of the work and the laser length measuring device, for example, the bending angle at the time of bending is accurately detected.

According to a second aspect of the present invention, there is provided the die of the first aspect, wherein the slit or the hole is provided near a shoulder of the die groove.

Therefore, since the slit or the hole is provided near the shoulder of the die groove, the distance between the both side surfaces of the work and the laser length measuring device can be detected more accurately. Is more accurately detected.

According to a third aspect of the present invention, there is provided a punch having a tip apex for bending a plate-like work, wherein the slit or hole in a direction perpendicular to the longitudinal direction of the tip apex is formed. Provided on the punch, a reflection surface is provided on the slit or hole to reflect the laser light emitted from the laser length measuring device from the slit or hole to the bent portion side of the work bent by the top of the tip. It is characterized by becoming.

Therefore, the reflection surface of the laser beam oscillated from the laser length measuring device is inclined in the slit or hole provided in the punch in a direction perpendicular to the longitudinal direction of the tip top of the punch. Then, the light is reflected by the reflecting surface and is irradiated to both side surfaces of the work. Then, by detecting the distance between both side surfaces of the work and the laser length measuring device, for example, the bending angle at the time of bending is accurately detected.

According to a fourth aspect of the present invention, there is provided a bending angle detecting method according to the present invention, wherein the work is pressed by a punch into the die groove of a die having a die groove for bending a plate-like work, and the work is V-shaped. When bending into a shape,
Detecting the distance from the reference position to the laser irradiation point of a plurality of points by irradiating a laser beam from a laser length measuring device at the reference position to a plurality of points on both sides of the work in the vicinity of both shoulders of the die groove, An inclination angle of both sides of the work is calculated based on the plurality of detection distances, and a bending angle of the work is obtained based on the inclination angles of both sides. Therefore, a plate-shaped work is placed on the die, and the work is pressed by the cooperation of the punch and the die to perform the bending process. At the time of this bending process, a laser beam is radiated from a laser measuring device at a reference position to a plurality of locations on both inclined side surfaces of the work near both shoulders of the die groove, and the laser beam is irradiated from the reference position to a plurality of laser irradiation points. The distance is detected. The inclination angles of both sides of the work are calculated based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the inclination angles of both sides. As a result, good bending accuracy is obtained.

According to a fifth aspect of the present invention, in the bending angle detecting method according to the fourth aspect, the bending angle is provided on the die in a plane orthogonal to the longitudinal direction of the die groove provided in the die. A laser mirror is provided at a reference position on a reflecting mirror provided in a slit or a slit provided in a punch provided in a slit provided on a punch, and laser light reflected by the reflecting mirror is provided on both side surfaces of the work. Then, the irradiation position on the workpiece is changed by moving the laser length measuring device or the reflection mirror to detect distances to a plurality of laser irradiation points.

Therefore, when the work is bent, the reflecting mirror provided at an angle in the slit provided in the die or in the slit provided in the punch in a plane orthogonal to the longitudinal direction of the die groove provided in the die. Laser light is emitted from a laser length measuring device provided at the reference position. Then, the laser light reflected by the reflection mirror is applied to both side surfaces of the work, and the irradiation position on the work is changed by moving the laser length measuring device or the reflection mirror, so that the distance to a plurality of laser irradiation points is changed. Is detected. The inclination angles of both sides of the work are calculated based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the inclination angles of both sides. As a result, good bending accuracy is obtained.

According to a sixth aspect of the present invention, there is provided a bending machine comprising a die having a die groove for bending a plate-like work, and a die approaching the die for pressing the work into the die groove. In a bending machine provided with a punch which is relatively movable in a separating direction, when bending the work by the punch and the die, a plurality of locations on both sides of the work inclined near both shoulders of the die groove. A suitable number of laser measuring devices that measure the distance from the reference position to the laser irradiation point by irradiating laser light from the reference position, and the distance from the reference position measured by this laser measuring device to multiple laser irradiation points Calculating means for calculating the inclination angles of both side surfaces of the work based on the calculated inclination angles, and calculating a bending angle of the work based on the calculated inclination angles.

Therefore, a plate-shaped work is placed on the die, and the work is pressed by the cooperation of the punch and the die to perform the bending process. At the time of this bending process, a laser beam is radiated from a laser measuring device at a reference position to a plurality of locations on both inclined side surfaces of the work near both shoulders of the die groove, and the laser beam is irradiated from the reference position to a plurality of laser irradiation points. The distance is detected. Based on the plurality of detected distances, the inclination angles of both sides of the work are calculated by the calculation means,
The bending angle of the work can be accurately obtained based on the inclination angles of both side surfaces calculated by the calculation means. As a result, good bending accuracy is obtained.

According to a seventh aspect of the present invention, there is provided the bending machine according to the sixth aspect, wherein a reflecting surface for reflecting the laser light oscillated from the laser length measuring device in the direction of the work is formed on a punch or a die. The laser length measuring device is provided so as to be movable within the reference position, and a stopper for regulating the moving position of the laser measuring device to a predetermined position or a length measuring device position detector for detecting the moving position is provided. It is a feature.

Therefore, the punch or the die is provided with a reflecting surface for reflecting the laser beam oscillated from the laser length measuring device in the direction of the work, and the laser length measuring device is provided movably within the reference position. Since a stopper for restricting the movement position of the laser length measuring device to a predetermined position or a length measuring device position detector for detecting the moving position is provided, the stopper or the length measuring device is moved by one laser length measuring device. Positioning is performed at a plurality of positions by the position detector. As a result, the inclination angles at both sides of a plurality of positions of the work are calculated by the calculating means, and the bending angle of the work is accurately obtained based on the tilt angles of the both sides calculated by the calculating means. As a result, good bending accuracy is obtained.

According to an eighth aspect of the present invention, in the bending machine according to the sixth aspect, a reflecting mirror for reflecting the laser light oscillated from the laser length measuring device in the direction of the work is provided on the punch or the die. In addition to the above, the reflection mirror is provided so as to be movable in a direction approaching and moving away from the laser length measuring device, and a stopper for controlling the movement position of the reflection mirror to a predetermined position or a mirror for detecting the movement position of the reflection mirror. It is characterized in that a position detector is provided.

Therefore, a punch or a die is provided with a reflecting mirror for reflecting the laser beam emitted from the laser length measuring device in the direction of the work, and the reflecting mirror approaches and separates from the laser length measuring device. The movable mirror is provided with a stopper or a mirror position detector for detecting the movement position of the reflection mirror, the stopper being capable of regulating the movement position of the reflection mirror to a predetermined position, so that the reflection mirror is moved and moved. The position is determined by a stopper or a mirror position detector. As a result, the inclination angles at both sides of a plurality of positions of the work are calculated by the calculating means, and the bending angle of the work is accurately obtained based on the tilt angles of the both sides calculated by the calculating means. As a result, good bending accuracy is obtained.

According to a ninth aspect of the present invention, there is provided a bending machine comprising: a die having a die groove for bending a plate-shaped work; and a die approaching the die for pressing the work into the die groove. In a bending machine comprising a punch that is relatively movable in the direction of separation and a back gauge that is movable back and forth and vertically up and down behind a bending position by the punch and the die, A reflecting surface is provided inclined in the front-rear direction, and the laser length measuring device for irradiating the laser beam reflected by the reflecting surface to the vicinity of the bent portion of the work and measuring the distance to the irradiation position of the work is provided on the back. It is characterized by being prepared for a gauge.

Accordingly, a plate-shaped work is placed on the die, the tip of the work is positioned against the back gauge, and then the work is pressed by the cooperation of the punch and the die to perform bending. . During this bending process,
In the vicinity of both shoulders of the die groove, laser light is irradiated from a laser length measuring device provided on a back gauge to a plurality of locations on both inclined side surfaces of the work, and a distance from the laser length measuring device to a plurality of laser irradiation points is reduced. Is detected. The inclination angle of both sides of the work is calculated by the calculating means based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the tilt angles of the both sides calculated by the calculating means. . As a result, good bending accuracy is obtained. In addition, the provision of the laser length measuring device in the existing back gauge eliminates the necessity of a device such as a moving shaft for newly providing the laser length measuring device, thereby reducing the cost.

According to a tenth aspect of the present invention, there is provided a bending machine comprising: a die having a die groove for bending a plate-like work; and a die approaching the die for pressing the work into the die groove. In a bending machine including a punch that is relatively movable in a direction away from each other, and a back gauge provided to be movable back and forth, left and right, and up and down behind a bending position by the punch and the die,
A slit or a hole is provided in the punch or die so as to penetrate in the front-rear direction. , And are provided so as to be movable and positionable in the vertical and horizontal directions.

Therefore, a plate-shaped work is placed on the die, the tip of the work is positioned against the back gauge, and then the work is pressed by the cooperation of the punch and the die to perform bending. . During this bending process,
A beam irradiating head is operated by moving a bending angle measuring unit including a reflection mirror, a beam irradiating head, and a beam oscillating device in front and rear, up, down, and left and right directions at a plurality of positions on both inclined side surfaces of the work and operating the beam oscillating device. A light beam is irradiated from the light source through a reflection mirror, and distances from the light beam irradiation head to a plurality of light beam irradiation points are detected. The inclination angles of both sides of the work are calculated based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the calculated inclination angles of both sides. As a result, good bending accuracy is obtained. Moreover, this reflection mirror
Since the bending angle measuring unit including the light beam irradiation head and the light beam oscillating device moves independently in the forward and backward, up and down, and left and right directions irrespective of the backgage, interference with the work when positioning the work is prevented.

According to an eleventh aspect of the present invention, there is provided a bending machine comprising: a die having a die groove for bending a plate-like work; and a die approaching the die for pressing the work into the die groove. In a bending machine including a punch that is relatively movable in a direction away from each other, and a back gauge provided to be movable back and forth, left and right, and up and down behind a bending position by the punch and the die,
A light beam oscillating device having a light irradiation head is provided on the lower surface of the abutment in the back gauge, and a support member is provided on the lower surface of the abutment so as to extend in the front-rear direction, and the tip of the support member penetrates through the slit or hole. And a reflection mirror to be moved in the front-rear direction.

Therefore, a plate-shaped work is placed on the die, the tip of the work is positioned against the back gauge, and then the work is pressed by the cooperation of the punch and the die to perform bending. . During this bending process,
A beam irradiating head is operated by moving a bending angle measuring unit including a reflection mirror, a beam irradiating head, and a beam oscillating device in front and rear, up, down, and left and right directions at a plurality of positions on both inclined side surfaces of the work and operating the beam oscillating device. A light beam is irradiated from the light source through a reflection mirror, and distances from the light beam irradiation head to a plurality of light beam irradiation points are detected. The inclination angles of both sides of the work are calculated based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the calculated inclination angles of both sides. As a result, good bending accuracy is obtained. Moreover, this reflection mirror
Since the bending angle measuring unit including the beam irradiating head and the beam oscillating device is provided integrally on the lower surface of the abutment in the backgage, it can be moved forward, backward, up and down, and left and right in accordance with the movement of the backgage. Therefore, there is no need to provide a separate drive source for the bending angle measurement unit.

According to a twelfth aspect of the present invention, in the bending machine according to the eleventh aspect, the support member is pivotally provided at a retracted position.

Therefore, since the support member is pivotally provided at the retracted position, interference with the work when positioning the work is prevented.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIGS. 1, 2 and 3, a press brake 1 as a bending machine includes side frames 3L and 3R that are erected, and a substantially central portion of the side frames 3L and 3R. Has a notch G. In addition, an upper table 7 as a ram on which a punch P is mounted is provided at the lower end of the side frames 3L and 3R at the lower front portion via a plurality of intermediate plates 5 so as to be vertically movable.

Left and right ball screw units 9L and 9R, which are ram driving means for vertically moving the upper table 7, are provided on the upper front surfaces of the side frames 3L and 3R. In the ball screw units 9L and 9R, a ball screw (not shown) is rotationally driven by the drive motor 11 to move the upper table 7 up and down.

On the other hand, front and rear (left and right in FIGS. 2 and 3) support plates 13F and 13R are provided on the lower front surface of the side frames 3L and 3R. Are the front and rear support plates 13F, 13R
It is sandwiched between the tops. Also, the left and right ends of the lower table 15 pass through the support plates 13F and 13R integrally and are fixed to the side frames 3L and 3R.
L, 17R.

Therefore, both left and right end portions of the lower table 15 are fixed to the side frames 3L, 3R in the vertical direction by the fulcrum pins 17L, 17R, but can be slightly vertically deformed in the central portion.

The crowning means for lifting the central portion of the lower table 15 with the left and right fulcrum pins 17L and 17R as fulcrums so that the central portions of the support plates 13F and 13R contact the lower side of the lower table 15. 19 are provided. Further, a control device 21 for controlling the drive motor 11 and the like is provided on the left side of the left side frame 3L in FIG.

Notch G of the side frames 3L, 3R
Is provided with a back gauge device 23 for adjusting the bending position of the workpiece W to the position of the punch P and the die D. In the back gauge device 23, a plurality of abutments 25 for abutting the work W are provided on the stretch 27, and the L-axis motor 29 causes the link mechanism 31 to move the L.
The stretch 27 is moved and positioned in the axial direction (front-back direction). In addition, by driving the Z-axis motor 33, the butting 2
5 is moved in the Z-axis direction (vertical direction). Further, by driving the Y-axis motor 35, the abutment 25 is moved in the Y-axis direction (left-right direction) by, for example, a rack and pinion drive mechanism.
Moved to

With the above configuration, the abutment 25 of the back gauge device 23 is moved in the Y-axis, L-axis, and Z-axis directions, positioned at a desired position, and the workpiece W is abutted against the abutment 25. Next, the work W is bent in cooperation with the punch P and the die D.

At an appropriate position in the left-right direction of the die D, FIG.
, A plurality of slits 37 are formed so as to communicate with the die groove DV. A hole may be used instead of the slit 37. In this slit 37, as shown in FIG. 5, there is provided a reflection mirror 39 which is inclined approximately 45 degrees diagonally upward to the right to form a reflection surface. The abutment 25 of the back gauge device 23 is provided with a laser length measuring device 41 as shown in FIG.

With the above configuration, the laser length measuring device 41
It is moved in the directions of the axis, the L axis and the Z axis and positioned at a desired position. Moreover, the laser length measuring device 41
The laser beam LB oscillated from the mirror W is reflected by the reflection mirror 39 and then applied to the side surface of the workpiece W through the slit 37. Then, the irradiated laser light LB is returned to the laser length measuring device 41 as return light, and the distance from the laser length measuring device 41 to the side surface of the work W is detected. The reference position, which is the tip position of the laser length measuring device 41 in the L-axis direction, is previously set to a desired position by the L-axis motor 29.

The laser length measuring device 41 is connected to the Z-axis motor 33.
, A plurality of distances to both sides of the workpiece W are detected. Therefore, the bending angle of the work W is accurately calculated using the detected distance to both side surfaces of the work W.

As shown in FIG. 6, the control device 21 has a CPU 43. The CPU 43 is connected to input means 45 such as a keyboard for inputting various data. Display means 47 such as a CRT for displaying various data is connected.
The Y-axis motor 35, the L-axis motor 29 and the Z-axis motor 33 each have an encoder 49 as a position detector,
51 and 52, and the CPU 43
It is connected to the.

The distance to the side surface of the workpiece W detected by the laser length measuring device 41 is connected to a distance memory 53 which is inputted to and stored in a CPU 43 and a calculating means 54 for calculating a bending angle is connected to the CPU 43. I have.

Next, the distance memory 53, the calculating means 5
The algorithm of detection and calculation will be described with reference to FIGS.

In FIG. 7, the laser length measuring device 41 includes, for example, one light emitting device and one light receiving device. The optical axes 1 and 2 of the laser beam LB oscillated from the single light emitting device are reflected mirrors. In FIG. 7 of the work W reflected by 39, the work W
To the right side of the Thereafter, the light is received by the light receiver as return light. By moving the laser length measuring device 41 upward in the Z-axis direction as shown by a two-dot chain line and positioning it and oscillating it with the optical axes 3 and 4 of the laser beam LB in the manner described above, the work W shown in FIG. At the left side of the work W. Thereafter, the light is received by the light receiver as return light. Therefore, the distances to the four sides of the work W are detected.

That is, the moving amount of Z ₁ → Z ₂ at that time is l ₁ , and the moving amount of Z ₃ → Z ₄ is l ₂ . Further, the moving amount of Z ₂ → Z ₃ is 1.

When the bending angle is calculated based on the detected distance with reference to FIG. 8, the following is obtained.
That is,

(Equation 1) When the difference between the measured length is alpha ₁

(Equation 2)

(Equation 3) Becomes Similarly,

(Equation 4) Therefore,

(Equation 5) Becomes

Next, the bending operation will be described with reference to the flowcharts of FIGS. 9, 10, 11, and 12. First, in FIG. 9, in step S1, the bending shape and material, plate thickness or back gauge axis, punch, die It is determined whether or not to input a relative movement amount. If it is determined that the relative movement amount is to be input, the process proceeds to step S2, and a step is performed after the bending and shape, material, plate thickness or back gauge axis, punch and die relative movement amounts are input. Proceed to S3. If it is determined in step S1 that the data is not input, the process proceeds to step S4,
The stored bending shape and material, plate thickness or back gauge axis, punch and die relative movement amounts are called, and step S
Proceed to 3.

In step S3, it is determined whether or not a punch and a die are to be input. If it is determined that the punch and the die are to be input, the process proceeds to a step S5, where the shapes or the required dimensions of the punch and the die are input and the process proceeds to a step S6. If it is determined in step S3 that the above data is not input, step S3 is executed.
The process proceeds to step S7, where the stored punch and die shapes or required dimensions are called, and the process proceeds to step S6.

In step S6, the positioning of the back gauge is completed, and in step S8, the work is inserted between the punch and the die and is brought into contact with the back gauge. In step S9, relative movement of the punch and the die is performed (D axis). Proceeding to step S10 in FIG. 10, the work W is sandwiched between the punch and the die.
In step S11, the back gauge is retracted (L
axis). Laser optical axis disposed in abutment in step S12 is moved to the position of Z ₁ and Y _1. Step S1
At 3, the D-axis is moved to a position slightly before the target position (bending operation) and stopped. From step S11 to step S13, as step S14, the D-axis may simultaneously move (bend) to slightly before the target position.

In step S15, the laser length measuring device 41
(Z₁, Y₁). Step S1
6 to Z axis₂Move to Laser in step S17
By the length measuring device 41, (Z₂, Yn) are measured. Next
Then, in step S18, the Z axis is ₃Move to Step
In step S19, (Z₃, Y₁)But
Measured. In step S20, the Z axis is set to Z₄Move to
You. In step S21 of FIG.
(Z₄, Yn) are measured. L in step S22
₁, A₁Is measured, and in step S23
l₂, A₂Ask for. Bending angle in step S24
The degree is calculated.

The method for obtaining (l ₁ , a ₁ ) and (l ₂ , a ₂ ) includes the following method. The laser light LB is converted into Z ₁ → Z ₂ and Z ₃ → Z ₄ shown in FIG. or it is continuously moved _{Z 1} → _{Z 4} are measured. That is, the shape of the outer peripheral surface on the die side of the work is obtained. Then, (l ₁ , a ₁ ) and (l ₂ , a ₂ ) can be obtained by using a method such as the least square method. This method can reduce measurement errors due to processing scratches on the die shoulder 12 on the work surface, unintended scratches, dust adhesion, and the like, and can obtain more accurate bending angle accuracy.

Thereafter, in step S25, θ₁,
θ₂,. . . . , Θn is within the allowable range.
If it is not within the range, the process proceeds to step S26.
Uning and tilt functions (tilt the movable table
That means. ) Is performed. If it is within the range,
The awning function and tilt function are not executed. Step
In step S27₁, Θ₂,. . . . , Θn is the first target angle
A determination is made whether it is within the degree range. The D value at this time
And the amount of crowning are stored. And θ₁,
θ ₂,. . . . , Θn are not within the initial target angle range
In step S28, the D axis is slightly bent in step S28.
Move in the direction to be moved. And the hand of step S15
Go back and try again.

Next, the process proceeds to step S29 in FIG.
The D-axis is slightly moved in a direction to reverse the bending. In step S30, steps S15 to S15 are executed.
Up to 24 are repeated. In step S31, springback is determined (θ ₁ −θ ′ ₁ , θn−θ ′).
n). In step S32, a new target angle is calculated (target angle− (θ ₁ −θ ′ ₁ ), target angle −θn−θ ′).
n)). In step S33, the D axis is moved slightly in the direction in which the bending process proceeds more than D. In step S34, steps S15 to S25 are repeatedly performed.

At step S35, it is determined whether or not the angle is within the range of the new target angle.
It returns to before 15, and is performed again. If it is within the range, the D-axis value and the crowning amount are stored in step S36, and the process ends.

The reflection mirror 39 is connected to the slit 3 of the die D.
The state of the laser beam LB is changed from the state shown in FIG. 7 to the state shown in FIG. 13 and FIG. The measurement may be performed by irradiating the laser beam LB to two points near the front and back of the shoulder of D or outside the shoulder.

Therefore, the laser beam LB from the laser length measuring device 41 provided in the back gauge 23 is provided at a plurality of locations on both inclined sides of the work W near both shoulders of the die groove DV.
Is irradiated, and the distance from the laser measuring device 41 to a plurality of laser irradiation points is detected. The inclination angle of both sides of the work W is calculated by the calculating means 54 based on the plurality of detected distances, and the bending angle θ of the work W is calculated based on the tilt angles of the both sides calculated by the calculating means 54. Can be determined accurately. As a result, good bending accuracy can be obtained. Moreover, the provision of the laser length measuring device 41 in the existing back gauge device 23 eliminates the necessity of a device such as a moving axis when newly providing the laser length measuring device 41, thereby reducing the cost.

FIG. 15 shows another embodiment.
That is, in FIG. 15, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 15, an X-axis drive motor 55 is provided on a bracket attached to the lower table 15, and the X-axis drive motor 55 is provided with a position detector 57 such as an encoder. Moreover, one end of a ball screw 59 is connected to the output shaft of the X-axis drive motor 55. A nut member 61 is screwed into the ball screw 59. The nut member 61 is provided with a Z-axis drive motor 63, and the Z-axis drive motor 63 is provided with a position detector 65 such as an encoder. In addition, one end of a ball screw 67 is connected to the output shaft of the Z-axis drive motor 63. A nut member 69 is screwed into the ball screw 67. The laser length measuring device 41 is integrated with the nut member 69.

This is an example in which the laser length measuring device 41 is provided with two light emitting portions.

With the above configuration, when the X-axis drive motor 55 is driven, the nut member 61 is moved in the X-axis direction via the ball screw 59. The amount of movement at that time is detected by the position detector 57. When the Z-axis drive motor 63 is driven, the nut member 69 is moved in the Z-axis direction via the ball screw 67. The amount of movement at that time is determined by the position detector 67.
Is detected by

Accordingly, the laser length measuring device 41 is moved in the X and Z axis directions, and the amount of movement is determined by the position detector 5.
7, 65 will be detected.

As shown in FIG. 15, by irradiating the laser beam LB toward the workpiece W from the laser length measuring device 41 along the optical axes 1, 2, 3, and 4, the bending angle is accurately detected in the manner described above. be able to.

FIG. 16 shows another embodiment replacing FIG. That is, in FIG. 15, the same components as those in FIG. 15 are denoted by the same reference numerals, and detailed description is omitted. FIG. 16 shows an example in which the Z-axis drive motor 63 is not provided with a position detector. In this case,
The bracket attached to the lower table 15 is provided with a plurality of cylinders 71, 73 in the Z-axis direction, and stoppers 75, 77 are mounted on the cylinders 71, 73.

With the above configuration, when positioning the laser length measuring device 41 at the position indicated by the solid line or the position indicated by the two-dot chain line, the cylinders 71 and 73 are operated to stop the stopper 75,
By projecting 77 from the position indicated by the solid line to the position indicated by the two-dot chain line, the laser length measuring device 41 can be positioned at the position indicated by the solid line or the position indicated by the two-dot chain line.

Accordingly, as shown in FIG. 16, by irradiating the laser beam LB toward the workpiece W from the laser length measuring device 41 along the optical axes 1, 2, 3, and 4, the bending angle is reduced in the manner described above. It can be detected accurately.

FIG. 17 shows another embodiment. That is, in FIG. 17, the same components as those in FIG. 15 are denoted by the same reference numerals, and detailed description is omitted.
In FIG. 17, a laser length measuring device 41 is provided on the right side of the die D, and one reflection mirror 39 is provided in the slit 37 so as to be movable in the left-right direction in FIG. A nut member 79 is integrated with the lower part of the reflection mirror 39, and a ball screw 81 is screwed to the nut member 79. Moreover, a Y-axis drive motor 83 is connected to the right end of the ball screw 81. The Y-axis drive motor 83 is provided with a position detector 85 such as an encoder.

With the above configuration, when the Y-axis drive motor 83 is driven, the ball screw 81 is rotated, and the reflection mirror 39 is moved in the Y-axis direction via the nut member 79. Therefore, when the laser beam LB is oscillated from the laser length measuring device 41, the laser beam LB is reflected by the reflection mirror 39 and irradiated on the side surface of the work W. By moving the reflection mirror 39 in the Y-axis direction at four positions as shown in FIG. 17, the light is irradiated on the four side surfaces of the work W, so that the bending angle can be accurately measured in the manner described above.

FIG. 18 shows another embodiment replacing FIG. That is, in FIG. 18, the same components as those in FIG. 17 are denoted by the same reference numerals, and detailed description is omitted. FIG. 18 shows an example in which the Y-axis drive motor 83 does not have a position detector. In this case,
A plurality of cylinders 87 are provided in the Y-axis direction, and a stopper 89 is mounted on the cylinder 87.

With the above configuration, when the reflection mirror 39 is positioned at the position indicated by the solid line or the position indicated by the two-dot chain line, the cylinder 87 is operated to cause the stopper 89 to protrude from the position indicated by the solid line to the position indicated by the two-dot chain line. The reflection mirror 39 can be positioned at the position indicated by the solid line or the position indicated by the two-dot chain line.

Therefore, as shown in FIG. 18, by irradiating the laser beam LB toward the work W from the laser length measuring device 41 along the optical axis, the bending angle can be accurately detected in the manner described above.

FIG. 19 shows another embodiment. In this case, a plurality of, for example, four laser length measuring devices 41 are provided below the slit 37 of the die D.
In this case, by irradiating the laser beam LB to the work W from the four laser length measuring devices 41 along the optical axis, the bending angle can be accurately detected as described above.

FIG. 20 shows another embodiment which replaces FIG. 20, parts that are the same as the parts shown in FIG. 19 are given the same reference numerals, and a detailed description thereof will be omitted. In FIG. 20, one laser length measuring device 41 is provided, and a nut member 91 is integrated below the laser length measuring device 41. A ball screw 93 extending in the Y-axis direction is provided on the nut member 91. It is screwed. A Y-axis drive motor 95 is connected to the right end of the ball screw 93. The Y-axis drive motor 95 is provided with a position detector 97 such as an encoder.

With the above configuration, when the Y-axis drive motor 95 is driven, the ball screw 93 is rotated, and the laser length measuring device 41 is moved via the nut member 91 in the Y-axis direction. Therefore, when the laser beam LB is oscillated from the laser length measuring device 41, the laser beam LB is irradiated on the side surface of the work W. By moving the laser length measuring device 41 in four directions in the Y-axis direction as shown in FIG. 20, the four side surfaces of the work W are irradiated, so that the bending angle can be accurately measured in the manner described above. Can be.

In the above-described example, the reflection mirror 39 or the laser length measuring device 41 is provided in the slit 37 of the die D, and the laser beam LB is oscillated from the laser length measuring device 41 so that the reflection mirror 39 is formed.
The example in which the bending angle is detected by irradiating the workpiece W with the laser beam LB via the laser beam LB has been described. Next, the reflection mirror 3 is inserted into the slit 37 of the punch P.
9 or a laser length measuring device 41 is provided, and the laser beam LB is oscillated from the laser length measuring device 41 via the reflection mirror 39.
Alternatively, the example in which the bending angle is detected by directly irradiating the workpiece W with the laser beam LB is shown in FIGS.
Shown by

FIG. 21 shows FIG. 15, FIG. 22 shows FIG. 16, FIG. 23 shows FIG. 17, FIG. 24 shows FIG. 18, and FIG.
26 and FIG. 26, the reflection mirror 39 or the laser length measuring device 41 is provided in the punch P corresponding to FIG. 20, and the same components are denoted by the same reference numerals. It works in the same way and has the same effect.

FIGS. 27 and 28 show another embodiment. 27 and 28, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted. 27 and 28, a guide post 99 in the backgage device 23 is shown.
The guide post 99 is provided with a stretch 27 movably in the vertical movement direction (vertical direction in FIGS. 27 and 28). ing. In addition, abutment 25 is provided on this stretch 27 in the left-right direction (FIG. 27).
28 (in the direction perpendicular to the plane of FIG. 28).

A slit 37 is formed in the die D so as to penetrate in the front-back direction. A hole may be used instead of the slit 37. On the lower surface of the abutment 25, a laser as a light beam oscillator in the bending angle measuring unit 101 is provided.
The oscillator 103 is provided. This laser oscillator 1
A laser head 105 as a light beam head is provided on the rear surface of the laser beam head 03.
Is provided. A bracket 107 extending in the front-rear direction is provided on the upper rear surface of the laser oscillator 101. In addition, the bracket 107 is mounted on the horizontal portion 1.
07A and a front end portion (rear end portion) 107B that is integrated with the horizontal portion 107A obliquely upward and leftward. A horizontal portion 107A of the bracket 107 having a front end portion (rear end portion) 107B penetrates through the slit 37 and is moved in the front-rear direction. A reflection mirror 109 is provided on the upper surface of the front end (rear end) 107B. The reflection mirror 109 may be a half mirror.

With the above arrangement, when the abutment 25 of the backgage device 23 is moved back and forth, right and left, and up and down, the bracket 107 is also moved to move the reflection mirror 109 to the position indicated by the solid line in FIG. Laser light oscillated by the laser oscillator 103 while being positioned at the dotted line position is irradiated from the laser head 105 onto the bent work W. As a result, the distances L1 and L2 from the laser head 105 to the two positions of the work W are measured, and the distance d1 between the two positions of the work W is measured. Thus, θ1 = tan -1 (L1-L2 / d1) is obtained.

Similarly, when the abutment 25 of the backgage device 23 is moved back and forth, left and right, and up and down, the bracket 107 is also moved, and the reflection mirror-1 is moved.
09 is positioned at the solid line position and the dotted line position shown in FIG.
The work W bent by the head 105 is irradiated.
As a result, the distances L3 and L4 from the laser head 103 to the two positions of the work W are measured, and the distance d2 between the two positions of the work W is measured. Thus,
θ2 = tan -1 (L3-L4 / d2) is obtained. Therefore, the bending angle θ = θ1 + θ2 can be accurately obtained. Moreover, in this case, the bending angle measuring unit 101 is moved in the front-back, left-right and up-down directions by the driving source in the backgage device 23, so that it is not necessary to provide a unique driving source for the bending angle measuring unit 101. be able to.

FIG. 29 shows another embodiment replacing FIG. 29, parts that are the same as the parts in the embodiment shown in FIG. 28 are given the same reference numerals, and detailed descriptions thereof will be omitted. In FIG. 29, a front lower surface of the abutment 25 in the backgage device 23 (FIG.
9, a support block 113 is provided on the lower right side.
Data 115 is provided. This turning drive motor 11
5 has a horizontal portion 1 on the bracket 107.
07A is connected at the front.

With the above configuration, the bending angle θ is as shown in FIG.
It can be measured in the same manner as shown in FIG. In the case of this embodiment, when positioning the work W with the backgage device 23, the turning drive motor 115 is driven to turn the bracket 107 to the retracted position shown by the two-dot chain line in FIG. By doing so, it is possible to prevent interference with the work W when positioning the work W.

FIG. 30 shows another embodiment replacing FIG. 30, the same components as those in the embodiment shown in FIG. 28 are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 30, a support frame 117 is attached to the rear side of the lower table 15 (right side in FIG. 31).
The guide post 99 is provided on the front end of the housing 17 so as to be movable in the front-rear direction. Also, this guide post 99
A stretch 27 movable in the up-down direction is provided at the rear end of the upper part, and an abutment 27 movable in the left-right direction is provided on the stretch 27.

With the above configuration, the stretch 27 is
The workpiece W can be moved in the left, right, up, and down directions to perform positioning of the workpiece W during bending.

A die holder 119 for mounting the die D is provided above the lower table 15.
On the rear side (the right side in FIG. 30) of the die holder 119, there is provided a movable frame 121 which is movable in the left-right direction. The movable frame 121 is provided with a movable block 123 movable in the front-rear direction, and a laser oscillator 103 movable vertically is provided on the movable block 123. Also, a laser oscillator 1
A laser head 105 is provided at the rear end of the optical disk 03, and a bracket 107 is attached thereto. The bracket 107 includes a horizontal portion 107A and a front end 107B, and a reflection mirror 109 is provided on an upper surface of the front end 107B.

With the above structure, when the bracket 107 is moved independently in the front and rear, left and right and up and down directions independently of the movement of the backgage device 23, the reflection mirror 109 passes through the slit 37 provided in the die D. The laser beam oscillated by the laser oscillator 103 while being moved and positioned in the front-rear direction is irradiated on the bent workpiece W from the laser head 105. As a result, the bending angle can be accurately measured in the same manner as described with reference to FIGS.

FIG. 31 shows another embodiment replacing FIG. In FIG. 31, the same components as those in the embodiment shown in FIG. 30 are denoted by the same reference numerals, and detailed description will be omitted. In FIG. 31, a punch P is provided below the upper table 7 with an intermediate plate 5 interposed therebetween.
Mounted at 25. The punch P is provided with a slit 37 penetrating in the front-rear direction. A hole may be used instead of the slit 37.

A movable frame 127 is provided on the front side (left side in FIG. 31) of the upper table 7 so as to be movable in the left-right direction (the direction perpendicular to the plane of FIG. 31). A movable block 129 movable in the front-rear direction is provided below the movable frame 127, and a bracket 131 movable vertically is provided below the movable block 129. The bracket 131 includes a vertical portion 131A, a horizontal portion 131B integrated below the vertical portion 131A, and a horizontal portion 131B.
Tip part 131 inclined downward and to the lower right integrated with the tip of
C. Further, a laser oscillator 103 is provided on the lower left surface of the horizontal portion 131B in FIG. 31, and a laser oscillator is provided on the rear surface of the laser oscillator 103.
The head 105 is provided. The bracket 13
A reflection mirror 111 is provided on the lower surface of the one end portion 131C.

With the above structure, the bracket 131 is moved in the front-back, left-right, and up-down directions, and the reflection mirror 109 is moved.
Are positioned at the solid line position and the dotted line position on the left side of the bending side of the workpiece W shown in FIG.
The laser light oscillated in step (1) is irradiated onto the bent workpiece W from the laser head 105. As a result, the laser head 1
05 and two distances L1 and L2 from the work W
Is measured, and the distance d1 between the two positions of the work W is measured. Thus, θ1 = tan -1 (L1
-L2 / d1).

Similarly, by moving the bracket 131 forward and backward, left and right, and up and down, the reflection mirror 109 is moved to the position shown in FIG.
Laser light oscillated by the laser oscillator 103 while being positioned at the solid line position and the dotted line position on the right side of the bending side of the work W shown in FIG. As a result, the distances L3 and L4 from the laser head 103 to the two positions of the work W are measured, and the distance d2 between the two positions of the work W is measured. Thus, θ2 = tan -1 (L3-L4
/ D2) is required. Therefore, the bending angle θ = θ1
+ Θ2 can be determined accurately. In addition, in this case, the bending angle measuring unit 101 is driven by separate driving sources regardless of the movement of the backgage device 23, and includes front and rear, left and right,
Since the workpiece is moved in the vertical direction, interference with the workpiece at the time of positioning the workpiece can be prevented.

The present invention is not limited to the above-described embodiments of the present invention, but can be embodied in other forms by making appropriate changes. In the above-described embodiment, an example in which the upper table 7 is moved up and down has been described. However, the lower table 15 may be moved up and down. The angle of the reflection mirror 39 does not affect the detection angle. However, this is only for the case of two-sided detection and affects one side. Further, the optical axis of the laser beam LB does not necessarily have to be horizontal. However, it is necessary that the optical axis 1 and the optical axis 2 of the laser beam LB and the optical axis 3 and the optical axis 4 of the laser beam LB are parallel to each other. Further, the laser length measuring device 41 has an optical axis 1 and an optical axis 2,
It is necessary to move each of the optical axis 3 and the optical axis 4 at right angles to the optical axis of the laser beam LB.

[0089]

As will be understood from the above description of the embodiment of the invention, according to the first aspect of the present invention, the laser beam oscillated from the laser length measuring device is directed in the longitudinal direction of the die groove. Near the bottom of a slit or hole provided in communication with the die groove in a direction orthogonal to the bottom, the light is reflected on the inclined reflecting surface and is irradiated to both side surfaces of the work. Then, by detecting the distance between both side surfaces of the work and the laser length measuring device, for example, the bending angle at the time of bending can be accurately detected.

According to the second aspect of the present invention, since the slit or hole is provided near the shoulder of the die groove, the distance between both side surfaces of the work and the laser length measuring device can be detected more accurately. This makes it possible to more accurately detect the bending angle at the time of bending, for example.

According to the third aspect of the present invention, the laser beam oscillated from the laser length measuring device has the reflecting surface inclined to the slit or hole provided in the punch in a direction orthogonal to the longitudinal direction of the top of the punch tip. Therefore, the light is reflected by the reflection surface and is irradiated to both side surfaces of the work. Then, by detecting the distance between both side surfaces of the work and the laser length measuring device, for example, the bending angle at the time of bending can be accurately detected.

According to the fourth aspect of the present invention, a plate-shaped work is placed on a die, and the work is pressed by the cooperation of the punch and the die to perform a bending process. At the time of this bending process, a laser beam is radiated from a laser measuring device at a reference position to a plurality of locations on both inclined side surfaces of the work near both shoulders of the die groove, and the laser beam is irradiated from the reference position to a plurality of laser irradiation points. The distance is detected. The inclination angles of both sides of the workpiece are calculated based on the plurality of detected distances, and the bending angle of the workpiece can be accurately obtained based on the inclination angles of both sides. As a result, good bending accuracy can be obtained.

According to the fifth aspect of the present invention, when the work is bent, the work piece is inclined in the slit provided in the die or in the slit provided in the punch in a plane orthogonal to the longitudinal direction of the die groove provided in the die. A laser beam is emitted from a laser measuring device provided at a reference position to the reflecting mirror provided as described above. Then, the laser light reflected by the reflection mirror is applied to both side surfaces of the work, and the irradiation position on the work is changed by moving the laser length measuring device or the reflection mirror, so that the distance to a plurality of laser irradiation points is changed. Is detected. The inclination angles of both sides of the workpiece are calculated based on the plurality of detected distances, and the bending angle of the workpiece can be accurately obtained based on the inclination angles of both sides. As a result, good bending accuracy can be obtained.

According to the sixth aspect of the present invention, the plate-like work is placed on the die, and the work is pressed by the cooperation of the punch and the die to perform the bending process. At the time of this bending process, a laser beam is radiated from a laser measuring device at a reference position to a plurality of locations on both inclined side surfaces of the work near both shoulders of the die groove, and the laser beam is irradiated from the reference position to a plurality of laser irradiation points. The distance is detected. The inclination angle of both sides of the work is calculated by the calculating means based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the tilt angles of the both sides calculated by the calculating means. Can be. As a result, good bending accuracy can be obtained.

According to the seventh aspect of the present invention, the punch or the die is provided with a reflecting surface for reflecting the laser light oscillated from the laser length measuring device in the direction of the work, and the laser length measuring device is positioned at the reference position. The laser length measuring device is provided with a stopper that restricts the moving position of the laser measuring device to a predetermined position or a length measuring device position detector that detects the moving position. At least it is positioned at a plurality of locations by a stopper or a length measuring device position detector. As a result, the inclination angles of the two sides of the work at a plurality of positions are calculated by the calculating means, and the bending angle of the work can be accurately obtained based on the tilt angles of the both sides calculated by the calculating means. As a result, good bending accuracy can be obtained.

According to the eighth aspect of the present invention, the punch or the die is provided with a reflecting mirror for reflecting the laser light oscillated from the laser length measuring device in the direction of the work, and the reflecting mirror is provided with the laser measuring device. The movable position is provided in the direction approaching and moving away from the container, and a stopper or a mirror position detector for detecting the movement position of the reflection mirror is provided, which can regulate the movement position of the reflection mirror to a predetermined position. The reflection mirror is moved, and the movement position is determined by the stopper or the mirror position detector. As a result, the inclination angles of the two sides of the work at a plurality of positions are calculated by the calculating means, and the bending angle of the work can be accurately obtained based on the tilt angles of the both sides calculated by the calculating means. As a result, good bending accuracy can be obtained.

According to the ninth aspect of the present invention, a plate-shaped work is placed on a die, the tip of the work is positioned against a back gauge, and then the work is pressed by the cooperation of a punch and a die. Then, bending is performed. At the time of this bending process, a laser beam is irradiated from a laser length measuring device provided on a back gauge to a plurality of locations on both inclined side surfaces of the work near both shoulders of the die groove, and laser irradiation is performed from the laser length measuring device at a plurality of locations. The distance to the point is detected. The inclination angle of both sides of the work is calculated by the calculating means based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the tilt angles of the both sides calculated by the calculating means. Can be. As a result, good bending accuracy can be obtained. In addition, since the existing back gauge is provided with the laser length measuring device, a device such as a moving shaft for newly providing the laser length measuring device is not required, and the cost can be reduced.

According to the tenth aspect of the present invention, a plate-shaped work is placed on the die, the tip of the work is positioned against the back gauge, and the work is pressed by the cooperation of the punch and the die. Then, bending is performed. At the time of this bending process, at several places on both inclined sides of the work,
The bending angle measuring unit consisting of the reflection mirror, the beam irradiation head and the beam oscillation device is moved and positioned in the front, rear, up and down and left and right directions, the beam oscillation device is operated, and the beam is irradiated from the beam irradiation head via the reflection mirror. , Distances from the light beam irradiation head to a plurality of light beam irradiation points are detected. The inclination angles of both sides of the work are calculated based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the calculated inclination angles of both sides. As a result, good bending accuracy can be obtained. In addition, since the bending angle measuring unit including the reflection mirror, the light irradiation head, and the light beam oscillating device moves independently of the backgage in the front-back, up-down, and left-right directions, it interferes with the work when positioning the work. Can be prevented.

According to the eleventh aspect of the present invention, the plate-shaped work is placed on the die, the tip of the work is abutted against the back gauge to determine the position, and then the work is pressed by the cooperation of the punch and the die. Then, bending is performed. At the time of this bending process, at several places on both inclined sides of the work,
The bending angle measuring unit consisting of the reflection mirror, the beam irradiation head and the beam oscillation device is moved and positioned in the front, rear, up and down and left and right directions, the beam oscillation device is operated, and the beam is irradiated from the beam irradiation head via the reflection mirror. , Distances from the light beam irradiation head to a plurality of light beam irradiation points are detected. The inclination angles of both sides of the work are calculated based on the plurality of detected distances, and the bending angle of the work is accurately obtained based on the calculated inclination angles of both sides. As a result, good bending accuracy can be obtained. In addition, since the bending angle measuring unit including the reflection mirror, the light irradiation head, and the light beam oscillating device is provided integrally on the lower surface of the abutment in the backgage, the back and forth movement follows the movement of the backgage. , And in the vertical and horizontal directions, it is not necessary to provide a separate drive source for the bending angle measuring unit. Claim 1
According to the second aspect of the present invention, since the support member is rotatably provided at the retracted position, it is possible to prevent interference with the work when positioning the work.

[Brief description of the drawings]

FIG. 1 is a front view of a press brake as a bending machine according to the present invention.

FIG. 2 is a left side view in FIG.

FIG. 3 is a right side view in FIG.

FIG. 4 is a front view of a die.

FIG. 5 is an enlarged view of a portion viewed from an arrow V in FIG. 2;

FIG. 6 is a configuration block diagram of a control device.

FIG. 7 is an explanatory diagram for detecting a bending angle.

FIG. 8 is an explanatory diagram for detecting a bending angle.

FIG. 9 is a flowchart illustrating the operation of the present invention.

FIG. 10 is a flowchart illustrating the operation of the present invention.

FIG. 11 is a flowchart illustrating the operation of the present invention.

FIG. 12 is a flowchart illustrating the operation of the present invention.

FIG. 13 is another explanatory view of a reflection mirror in a slit of a die.

FIG. 14 is another explanatory view of a reflection mirror in a slit of a die.

FIG. 15 is an explanatory diagram of an example in which a reflection mirror is provided in a slit of a die, and a bending angle is detected by moving a laser length measuring device in a vertical direction.

FIG. 16 is an explanatory diagram of another example in which a reflection mirror is provided in a slit of a die, and a bending angle is detected by moving a laser length measuring device in a vertical direction.

FIG. 17 is an explanatory diagram of an example in which a reflection mirror is provided in a slit of a die, a laser length measuring device is fixed, and the reflection mirror is moved in the front-rear direction to detect a bending angle.

FIG. 18 is an explanatory view of another example in which a reflection mirror is provided in a slit of a die, a laser length measuring device is fixed, and the reflection mirror is moved in the front-back direction to detect a bending angle.

FIG. 19 is an explanatory diagram of an example in which a plurality of laser length measuring devices are fixedly provided in a slit of a die and a bending angle is detected.

FIG. 20 is an explanatory diagram of another example in which a laser length measuring device is moved in a left-right direction in a slit of a die to detect a bending angle.

FIG. 21 is an explanatory diagram of an example in which a reflection mirror is provided in a slit of a punch, and a bending angle is detected by moving a laser length measuring device in a vertical direction.

FIG. 22 is an explanatory diagram of another example in which a reflecting mirror is provided in a slit of a punch, and a bending length is detected by moving a laser length measuring device in a vertical direction.

FIG. 23 is an explanatory diagram of an example in which a reflection mirror is provided in a slit of a punch, a laser length measuring device is fixed, and the reflection mirror is moved in the front-rear direction to detect a bending angle.

FIG. 24 is an explanatory diagram of another example in which a reflecting mirror is provided in a slit of a punch, a laser length measuring device is fixed, and the reflecting mirror is moved in the front-rear direction to detect a bending angle.

FIG. 25 is an explanatory diagram of an example in which a plurality of laser length measuring devices are fixedly provided in a slit of a punch and a bending angle is detected.

FIG. 26 is an explanatory diagram of another example in which a laser length measuring device is moved in the left and right directions in a slit of a punch to detect a bending angle.

FIG. 27 is an explanatory view of another example in which a bending angle measuring unit is provided on the lower surface of the abutment of the backgage device and the bending angle is detected by using the movement of the backgage device.

FIG. 28 is a diagram illustrating the operation of detecting a bending angle in FIG. 27;

FIG. 29 is an explanatory view in which a bending angle measuring unit can be retracted to a retracted position in FIG.

FIG. 30 is an explanatory view of another example in which a bending angle measuring unit is provided on the die side to detect a bending angle irrespective of the backgage device.

FIG. 31 is an explanatory view of another example in which a bending angle measuring unit is provided on the punch side to detect a bending angle.

FIG. 32 is an operation explanatory diagram for detecting a bending angle in FIG. 31;

FIG. 33 is an explanatory diagram for detecting a conventional bending angle.

FIG. 34 is an operation explanatory view when a conventional bending angle is detected.

FIGS. 35A and 35B are explanatory diagrams of an operation when a conventional bending angle is detected.

36 (A) and (B) are explanatory diagrams of an operation when a conventional bending angle is detected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press brake (bending machine) 7 Upper table 15 Lower table 23 Back gauge device 37 Slit 39 Reflection mirror (reflection surface) 41 Laser length measuring device 53 Distance memory 54 Calculation means P Punch D Die W Work DV Die groove LB Laser light

Continued on the front page F term (reference) 2F065 AA06 AA31 AA33 AA36 BB01 BB25 CC00 DD00 DD03 FF00 FF17 GG04 HH04 HH12 JJ05 KK02 LL12 LL28 MM14 MM24 PP02 PP04 PP22 QQ23 4E063 AA01 BA07 DA01 FA05 GA07 JA07

Claims (12)

[Claims] 1. A die having a die groove for bending a plate-shaped work, wherein a slit or a hole in a direction orthogonal to a longitudinal direction of the die groove is provided in communication with the die groove, A die, characterized in that a reflection surface for reflecting a laser beam oscillated from a laser length measuring device in the direction of the die groove is provided near the bottom of the slit or hole. 2. The die according to claim 1, wherein the slit or the hole is provided near a shoulder of the die groove. 3. A punch having a tip top for bending a plate-like workpiece, wherein a slit or a hole in a direction perpendicular to the longitudinal direction of the tip top is provided in the punch, and a laser length measuring device is provided. Characterized in that the slit or hole is provided with a reflecting surface for reflecting the laser beam oscillated from the slit or hole from the slit or hole to the bent portion side of the work bent by the tip apex. . 4. A die provided with a die groove for bending a plate-shaped work, the work being pressed by a punch into the die groove to bend the work into a V-shape when both the die grooves are bent. The laser beam is irradiated from the laser length measuring device at the reference position to a plurality of locations on the inclined side surfaces of the work near the shoulder to detect the distance from the reference position to the laser irradiation points at the plurality of locations. A bending angle of both sides of the work is calculated based on the angle of the work, and a bending angle of the work is obtained based on the slopes of the both sides. 5. A reflection mirror provided at a reference position on a reflection mirror provided inclining in a slit provided in the die or a slit provided in a punch in a plane orthogonal to a longitudinal direction of a die groove provided in the die. Irradiating laser light from the laser length measuring device, irradiating the laser light reflected by the reflection mirror to both side surfaces of the work, and changing the irradiation position on the work by moving the laser length measurement device or the reflection mirror. 5. The bending angle detecting method according to claim 4, wherein the distances to the laser irradiation points at a plurality of positions are detected. 6. A die having a die groove for bending a plate-shaped work, and a die which is relatively movable in a direction approaching and separating from the die to press the work into the die groove. In a bending machine equipped with a punch,
At the time of bending the work by the punch and the die, the laser beam is irradiated from a reference position to a plurality of positions on both inclined side surfaces of the work near both shoulders of the die groove to measure a distance to a laser irradiation point. Based on the appropriate number of laser measuring devices and the distance from the reference position measured by this laser measuring device to the plurality of laser irradiation points, the inclination angles of both side surfaces of the work are calculated. And a calculating means for calculating a bending angle of the work based on the bending machine. 7. A punch or a die is provided with a reflecting surface for reflecting laser light oscillated from the laser length measuring device in the direction of a work, and a laser length measuring device is movably provided within a reference position. 7. The bending machine according to claim 6, further comprising a stopper for restricting a movement position of the long device to a predetermined position or a length measuring device position detector for detecting the movement position. 8. A punch or a die is provided with a reflecting mirror for reflecting the laser beam oscillated from the laser length measuring device in the direction of the work, and the reflecting mirror is moved in a direction approaching and moving away from the laser length measuring device. 7. The bending machine according to claim 6, further comprising a stopper movably provided and a stopper capable of restricting a movement position of the reflection mirror to a predetermined position or a mirror position detector for detecting a movement position of the reflection mirror. . 9. A die having a die groove for bending a plate-shaped work, and a die which is relatively movable in a direction approaching and separating from the die to press the work into the die groove. In a bending machine comprising a punch and a back gauge movably back and forth and vertically movable behind a bending position by the punch and the die, a reflection surface is provided in the die so as to be inclined in the front-rear direction. The back gauge is provided with a laser length measuring device for irradiating the laser beam reflected by the reflecting surface to the vicinity of the bent portion of the work and measuring the distance to the irradiation position of the work. Bending machine. 10. A die provided with a die groove for bending a plate-shaped work, and a die which is relatively movable in a direction approaching and separating from the die to press the work into the die groove. In a bending machine comprising a punch and a back gauge provided to be able to move back and forth, left and right, and up and down behind a bending position by the punch and the die, a slit penetrating the punch or the die in the front and rear direction. Or, a hole is provided, and a reflection mirror to be moved through the slit or hole in the front-rear direction and a bending angle measuring unit including a light irradiation head and a light beam oscillating device are provided so as to be movable and positionable in the front-rear, up-down and left-right directions. A folding machine. 11. A die provided with a die groove for bending a plate-shaped work, and a die which is relatively movable in a direction approaching and separating from the die to press the work into the die groove. In a bending machine comprising a punch and a back gauge provided to be able to move back and forth, left and right, and up and down behind the bending position by the punch and the die, a light irradiation head is provided on a lower surface of the back gauge. A supporting member extending in the front-rear direction is provided on the lower surface of the abutment, and a reflecting mirror to be moved in the front-rear direction through the slit or hole at the tip of the supporting member. A bending machine characterized by being provided. 12. The bending machine according to claim 11, wherein the support member is provided at a retracted position so as to be pivotable.