JPH01312406A - Tilt decider - Google Patents

Abstract

PURPOSE:To measure a tilt of work by arranging a main distance sensor near the work to be machined and more than one sub-distance sensors near the main distance sensor. CONSTITUTION:An eddy current sensor 37 and optical fiber sensors 38a and 38b are buried into a slant face of a V groove 36 of a bottom die 9. When an AC drive signal is supplied, the sensor 37 generates an AC magnetic field to detect a distance L0 from an end face thereof to work 5 and the results of detection are supplied to a judgement section 39. Optical fiber sensors 38a and 38b are arranged above and below the sensor 37 and when a laser light is supplied from a fiber driving circuit 40, it is emitted from the end face to irradiate the work 5. The laser light reflected on the work 5 is picked up to be introduced to the circuit 40. The judgement section 39 measures an angle of the work 5 from the results of detection of the sensors 38a, 38b and 37.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an inclination determination device that is attached to and used in a bending machine such as a press brake, a laser processing machine, or the like.

(Prior Art) In a bending machine such as a press brake, either an upper mold or a lower mold is moved to remove the workpiece held between the upper mold and the lower mold. It is bent.

FIG. 7 is a side view showing an example of such a folding machine.

The bending machine shown in this figure includes a frame 100 formed in a rectangular shape, a fixed body 101 fixed to the upper side of this frame 100, and an upper mold 102 fixed to the lower end of this fixed body 101. The frame 100 includes a ram 103 attached to the lower side of the frame 100 so as to be movable up and down, and a lower mold 104 fixed to the upper end of the ram 103.

Then, when the operation switch is turned on with the workpiece 105 inserted between the upper mold 102 and the lower mold 104, the hydraulic mechanism (not shown) is activated, and the ram 1
03 rises, and the workpiece 105 is held between the lower mold 104 attached to the upper end of this ram 103 and the upper mold 102, as shown in FIG. 8(a).
It is bent as shown in b).

(Problems to be Solved by the Invention) By the way, as shown in FIG. Based on the output of
There is a method that measures the bending angle θ of the workpiece 105 and uses it as a front thread.

However, such an eddy current sensor 106
As shown in FIGS. 0(a) and (b), the eddy current sensor 106 and
If the distance 1- to the workpiece 105 is the same, the workpiece 10
Since the distance 111i signal having the same value is generated regardless of the direction of inclination of the eddy current sensor 106 and the workpiece 105, when the distance between the eddy current sensor 106 and the workpiece 105 is the same, the lower mold 104 V′ of

Even if the angle θ of the workpiece 105 is wider than the groove angle, or even if it is a narrow angle as shown in FIG. 11(b), the same distance signal is output and the angle of the workpiece 105 is There was a problem in that it was not possible to determine whether it was a wide-angle or a narrow-angle.

In addition, the workpiece 105 is used for laser processing machines, etc.
If the workpiece is tilted, accurate machining cannot be performed, so measuring the tilt angle of the workpiece is a very important problem in such processing machines as well.

In view of the above circumstances, the present invention can measure the inclination of the workpiece, thereby adjusting the angle of the workpiece to the V" of the lower mold.
It is an object of the present invention to provide an inclination determining device that can identify whether a groove is wide-angle or narrow-angle rather than the angle of the groove, and can improve processing accuracy.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the inclination determination device according to the present invention includes a main distance sensor disposed near a workpiece to be processed, and a main distance sensor. two or more sub-distance sensors provided in the vicinity of and the detection results of these sub-distance sensors;
The present invention is characterized by comprising a determining section that determines the inclination angle of the workpiece based on the detection result of the main distance sensor.

(Operation) In the above configuration, when a measurement command is input, the inclination angle of the leak is determined based on the detection result of the main distance sensor and the detection result of each sub distance sensor.

(Embodiment) FIG. 4 is a front view showing an example of a bending machine using an embodiment of the tilt determination gA according to the present invention.

The bending machine shown in this figure includes a bending machine main body 1, a control wJ device 2 disposed near the bending machine main body 1, a two-handed push button device 3 disposed near the control device 2, A foot switch device 4 is provided.

When the two-handed pushbutton device 3 or the foot switch device 4 is operated, the control device 2 operates based on the operation contents to operate the bending machine main body 1, and the workpiece 5 is
fold.

The bending machine main body 1 includes a machine stand 6 that is the backbone of the bending machine main body 1, an acid cover 7 that covers the front lower part of the machine stand 6, and a top and bottom section between the front cover 7 and the machine stand 6. A lower apron 8 that is movably arranged, a lower mold 5 that is attached to the upper part of the lower nibron 8], side plates 10.11 that are vertically installed on both sides of the machine stand 6, and each of these side plates 10.11.
The upper apron 12 is supported by the upper apron 12, and the upper mold 13 is attached to the lower part of the upper apron 12. The work 5 is inserted between the provided lower mold 9 and the upper mold 13 attached to the upper apron 12, and bent.

As shown in FIG.
It is equipped with a positioning mechanism 16, a back gauge n mechanism 17, etc., and when processing the workpiece 5, raises the lower apron 8, and when it reaches a predetermined position, switches the operation of the hydraulic mechanism 15. Further, when a back gauge operation pulse train is supplied, the back gauge is positioned, evacuated, etc. based on this back gauge operation pulse train.

The hydraulic mechanism 15 includes a motor 18, a pump 19 driven by the motor 18, a cylinder 20 that is operated by the hydraulic pressure obtained by the pump 19 to move the lower apron 8 up and down, and a cylinder 20 that moves the lower apron 8 up and down. It is provided with a check valve 21 with a poppet that is moved up and down in the same way when the valve 8 is moved up and down.

When power is supplied to the motor 18, the cylinder 20 operates to raise the lower apron 8. Then, when this lower apron 8 rises to a predetermined position and the poppet 22 of the check valve with poppet 21 comes into contact with the dog 26 of the positioning mechanism 16, the check valve with poppet 21 operates to control the hydraulic mechanism 15. Switch operation.

Further, the positioning mechanism 16 includes a motor 23 and this motor 2.
an encoder 24 that detects the rotation speed of the motor 2;
3, the threaded rod 25 is rotatably driven by the threaded rod 2
The motor 23 is provided with a dog 26 that moves up and down in response to the rotational movement of the motor 23, and when power is supplied to the motor 23, this operates to rotate the threaded rod 25 and move the dog 26 up and down. Then, when the power supplied to the motor 23 is cut off, the dog 26 is stopped at that position.

In addition, the back gauge mechanism 17 includes a motor 27, an encoder 28 that detects the number of rotations of the motor 27, a pole screw 42 that is rotationally driven by the motor 27, and a horizontal movement that corresponds to the rotational movement of the ball screw 42. a pole nut 29, a beam member 30 attached to the pole nut 29, a threaded rod 31 rotatably attached to the beam member 30, a handle 32 fixed to the upper end of the threaded rod 31, and a handle 32 fixed to the upper end of the threaded rod 31. A bracket 33 that moves up and down in response to rotational movement, a backstretch 34 attached to the tip of this bracket 33, and a backstretch 34 attached to the tip of this backstretch 34 to detect when the workpiece 5 comes into contact with the backstretch 34. A detector 35 is provided.

Then, when the backgauge operation pulse train is supplied,
The motor 27 operates in response to this back gauge operation pulse train to move the pole nut 29 to the detector 35 in the horizontal direction, position the back stretch 34,
or evacuate.

Moreover, if the threaded rod 31 is turned by the handle 32,
Correspondingly, the bracket 33 is moved upward (or downward).
to change the vertical position of the backstretch 34.

FIG. 1 shows the main structure of a bending machine to which the present invention is applied.

As shown in the figure, the lower mold 9 is formed to have a rectangular cross section, and the upper surface side thereof has VI! A groove 36 is formed, and an eddy current sensor 37 and optical fiber sensors 38a and 38b are embedded in the slope of the 'V' groove 36.

When the eddy current sensor 37 is supplied with an AC drive signal,
An alternating current magnetic field is generated, the distance Lo from the end face to the workpiece 5 is detected, and the detection result is supplied to the determination section 39 shown in FIG.

Further, the optical fiber sensors 38a and 138b are arranged above and below the eddy current sensor 37, respectively, and when a laser beam is supplied from the fiber drive circuit 40, it is emitted from the end face and irradiates the work 5. Then, the laser beam reflected by the workpiece 5 is taken in and guided to the fiber drive circuit 40.

When the fiber drive circuit 40 is supplied with the measurement start signal, it generates a laser beam and supplies it to the optical fiber sensors 38a and 38b, and from this time,
The time until the laser beam reflected by the workpiece 5 is received by each of the optical fiber sensors 38a and 38b is measured. Thereafter, distances L+ and L2 from the end faces of the optical fiber sensors 38a and 38b to the workpiece 5 are calculated based on this time, and the calculation results are supplied to the determination section 39.

The determination unit 39 compares the detection result of the optical fiber sensor 38a (distance 11L+) with the detection result of the optical fiber sensor 38b (distance L2), and if L+ = L2, then the difference is <8) in FIG. As shown, work 5 and ゛V'' full 3
It is determined that the slope of No. 6 is parallel to the slope. Thereafter, the angle θ0 of the workpiece 5 obtained based on the detection result (distance Lo) of the eddy current 37 is supplied to the display unit 41 and displayed.

Moreover, if Ll<12, as shown in FIG. 3(b), -
Thus, it is determined that the angle θ0 of the workpiece 5 is larger than the angle of the 11 V II groove 36. Then, the wide-angle side of the two angle data obtained based on the detection result (distance ML, o) of the eddy current sensor 37 is selected, and this is supplied to the display section 41 as the angle of the workpiece 5. Avoid displaying.

Further, if II>12, it is determined that the angle θ0 of the workpiece 5 is smaller by b than the angle of the "V" groove 36, as shown in FIG. 3(C'). After this, the included angle side of the two angle data obtained based on the detection result of the eddy current sensor 37 (distance is 10) is selected, and this is supplied to the display unit 41 as the angle of the workpiece 5 and displayed. let

In this embodiment, the eddy current sensor 37, the optical fiber sensors 38a and 38b, the determination section 39, etc., and the fiber drive circuit 40 constitute a tilt determination device, and the tilt determination device -C Since the inclination of the workpiece 5 is determined, it is possible to determine whether the angle Oo of the workpiece 5 is an included angle or a wide angle. In addition, since the angle of the workpiece 5 is calculated based on this judgment result, the angle of the workpiece 5 is wider or narrower than the angle of the °V'' groove of the π mold, and the workpiece 5 can be accurately determined.

Further, in the embodiment described above, the inclination determination device according to the present invention was explained using a bending machine as an example, but the present invention is not limited to such a bending machine, but can be applied to other types of processing, such as a laser processing machine, etc. It can also be applied to

In this case, as shown in FIG. 6, the laser processing nozzle 43
An eddy current sensor 44 is attached to the tip of the laser processing nozzle 43, and two or more optical fiber sensors 45 are attached around the laser processing nozzle 43, and the output of these eddy current sensors 44 and the output of the optical fiber sensor 45 are Based on this, the inclination of the rework 5 is measured by the process described above.
The machining accuracy can be significantly improved.

[Effect of the Invention 1] As explained above, according to the present invention, the inclination of the workpiece can be measured, and it is thereby possible to determine whether the angle of the workpiece is wider than the angle of the 'V' groove of the lower mold. It is possible to identify whether the angle is an included angle, and it is also possible to improve processing accuracy in bending processing, laser processing, etc.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main part showing an embodiment of the inclination determination device according to the present invention, FIG. 2 is a block diagram showing an example of the circuit configuration of the same embodiment, and FIGS. 3(a) to (C) are respectively 4 is a front view showing an example of a bending machine to which the present invention is applied; FIG. 5 is a side view showing details of the drive mechanism shown in FIG. 4; Fig. 6 is a front view of the main parts of an example of a laser processing machine using an embodiment of the inclination determination device according to the present invention, Fig. 7 is a side view of an example of a conventional bending machine, and Fig. F3 (a) and (b) are side views showing an example of the operation of the single-folding machine shown in Fig. 7, Fig. 9 is a sectional view showing details of the lower die shown in Fig. 7, and Fig. 10. (a), cb> are schematic diagrams for explaining the characteristics of the eddy current sensor shown in Fig. 9, and Fig. 11 (a) and (b) are the problems of the bending machine shown in Fig. 7, respectively. FIG. 2 is a sectional view for explaining. 5... Work 37... Main distance sensor (eddy current sensor) 38a, 38b... Sub distance sensor (optical fiber sensor) 39... Judgment Department agent Patent attorney Yasu Miyoshi Male 5 - Work 37 ...Main distance track sensor (1152 sensor) 38a, 38b...Sub distance sensor (optical fiber sensor) 39...Judgment section Fig. 1 9' Fig. 2 Fig. 3 (a) Fig. 3 (b ) Figure 3 (C) Figure 4 Figure 7 Figure 8 (a) Figure 8 (b) Figure 9

Claims (1)

[Claims] (1) A main distance sensor placed near the workpiece to be processed, two or more sub-distance sensors provided near this main distance sensor, and the detection results of these sub-distance sensors and the main distance sensor An inclination determination device comprising: a determination unit that determines the inclination angle of the workpiece based on the detection result of the workpiece.