JPH11104740A - Method of and device for detecting mold mounting position error on plate member bending machine, and method of and device for automatically setting original position of back gauge butting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a correct bending processing possible even when a punch is deviatedly mounted. SOLUTION: When a bending position of a processing member work is positioned by a butting 15 of the back gauge device to be at the lower part of the punch P, positions and angles of both faces of the tip end of the punch P are measured by a pair of mold tip end angle measuring device 29, which has a known angle, as well as having its center set at a real centering position. A NC device, being a controlling device, obtains a deviation from the real centering position of the punch P based on the position and angle measured, and automatically adjusts the position of the butting 15 on the basis of the deviation value thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting a mounting error of a die in a sheet bending machine and a method and an apparatus for automatically setting an origin of a back gauge abutment.

[0002]

2. Description of the Related Art As shown in FIG. 9, in a conventional plate bending machine such as a press brake 101, a work W which is a workpiece is pressed against a back gauge set at a desired position. By hitting the punch 103, the bending position of the work W is positioned at the bending position of the punch P and the die D, and bending is performed by cooperation of the punch P and the die D.

[0003] Based on FIGS. 10 and 11 (A) ~ (C) , will be described bending order of the bent product W _1.
Here, the developed length is DVP, the piece extension is L, and the deviation of the bending position from the center of the table is α (see FIG. 14). In the product W _1, point a distance from one end portion P ₀ of the H ₁ P1
In bent at a right angle, point P ₂ of the distance from the point P ₁ of the H ₂
In right angle bent inward, bent at right angles further from point P ₂ to the inside in terms P ₃ distance H _3. This product W ₁
Is usually bent in the following procedure.

[0004] Referring first to FIG. 11 (A), the positioning from the position bending the position of the abutment 103 to the position of L _1,
Optionally abutting the workpiece W (FIG. 11 (A) state shown by solid line in), bending the point P ₃ of the workpiece W (the state shown in FIG. 11 (A) Medium dashed line). At this time, L ₁ is L ₁ = H ₄ −L−α
Given by

Next, referring to FIG. 11B, the position of the butting 103 is positioned from the bending position to the position of L ₂ ,
Optionally abutting the workpiece W (FIG. 11 (B) state shown by solid line in), bending the points P ₁ of the workpiece W (state indicated by a broken line in FIG. 11 (B)). At this time, L ₂ is L ₂ = H ₁ −L−α
Given by

[0006] Subsequently, referring to FIG. 11 (C), the positioning from the position bending the position of the abutment 103 to the position of L _3, optionally abutting the workpiece W (state shown by the solid line Medium FIG 11 (C) ), bending point P ₂ of the workpiece W state shown by the broken line medium (FIG. 11 (C)). At this time, L ₃ is L ₃ = H ₂ −L−α
Given by

Next, FIGS. 12 and 13 (A) to 13 (D)
Based on, it will be described bending another product W _2. In the product W _2, one end portion P ₀ orthogonally bent at a point P ₁ of the distance of an H ₁ from a right angle bent to the opposite side in terms P ₂ distance from this point P ₁ of the H _2, point in terms P ₃ distance from P ₂ H ₃ perpendicularly bent to the same side as the bending of the point P _2, a right angle further from point P ₃ to bend in the opposite direction of the point P ₃ in terms P ₄ of the distance H ₄ It is bent. The product W ₂ is bent in the usual following steps.

First, referring to FIG.
Positioning a position bending position 03 to the position of L _1, it has abutting the workpiece W (state shown by the solid line Medium FIG 13 (A)),
Bending point P ₃ of the workpiece W (state shown by the broken lines in FIG. 13 (A)). At this time, L ₁ is L ₁ = H ₁ + H ₂ + (H ₃ −
t) −5 · L−α. Where t is the product W
² shows the plate thickness.

Next, referring to FIG. 13B, the position of the abutment 103 is positioned from the bending position to the position L ₂ ,
Have abutment points P ₃ of the workpiece W (state indicated by a solid line in FIG. 13 (B)), bending the points P ₁ of the workpiece W (state shown by the broken lines in FIG. 13 (B)). At this time, L ₂ is L ₂ = H ₂ + H
It is given by ₃ -3 · L-α.

[0010] Subsequently, referring to FIG. 13 (C), butting and positioning the bend position the position of 103 in the position of L _3, have abutment points P ₅ of the workpiece W (FIG. 13 (C) in state indicated by solid lines), bending the point P ₄ of the workpiece W (FIG. 13
(C) State shown by the middle broken line). At this time, L ₃ is L ₃ =
It is given by H ₅ -L-α.

Finally, referring to FIG. 13D, the position of the abutment 103 is positioned from the bending position to the position of L ₄ ,
Have abutment points P ₃ of the workpiece W (FIG. 13 (D) state shown by solid line in), by bending the point P ₂ of the workpiece W (state indicated by a broken line in FIG. 13 (D)), bending is completed . At this time, L
₄ is given by _{L 4 = H 3 -L-α} .

[0012]

[SUMMARY OF THE INVENTION However, in such a prior art, FIG. 13 (A) in the bending step the product W _2, as shown (B), the bend skipping bend point In such a case, there is a problem that an error in the origin is misunderstood as a difference in elongation, and a great deal of man-hours must be spent to correct the product.

That is, the bending value of the product W _{1 and} the bending of the product W _{2 at} the points P ₄ and P ₂ are L + α, but the bending of the product W _{2 at} the point P ₃ is (5 · L
+ Α) / 5, and the bending at the point P ₁ is (3 · L
+ Α) / 3, and it is difficult to correct the displacement of the origin position of the butting 103.

SUMMARY OF THE INVENTION An object of the present invention is to pay attention to the prior art described above, and a mold for a plate material bending machine for performing accurate bending even when a punch is shifted and mounted. It is an object of the present invention to provide a method and a device for detecting a mounting position error, and a method and a device for automatically setting the origin of a back gauge abutment.

[0015]

In order to achieve the above object, a method for detecting an error in the mounting position of a mold in a plate bending machine according to the present invention is provided inside a plate bending machine. The workpiece is positioned at the position of the punch mounted on the upper table and the position of the die mounted on the lower table by abutting against the butting of the back gauge device,
In the method for detecting a mounting position error of a die in a plate bending machine for bending a work by cooperation of the punch and the die, a pair of die tips having a center at a true center position and having a known angle The position and angle of the punch tip are measured by an angle measuring device, and the deviation of the punch tip position is determined from the measured positions and angles of the front and rear surfaces of the punch tip.

Accordingly, when the bending position of the workpiece to be processed is positioned below the punch by abutment of the back gauge device, a pair of mold tips having a center at a true center position and having a known angle. The position and angle of the front and rear surfaces of the tip of the punch are measured by an angle measuring device, and the deviation from the true center position of the punch is determined from the measured position and angle.

According to a second aspect of the present invention, there is provided a method for detecting an error in a mounting position of a mold in a plate bending machine, the method comprising: Then, the mold tip angle measuring device is brought into contact with a calibration mold that is accurately attached to the center of the upper table and has known angles at both front and rear ends of the tip to measure a position and an angle. Performing calibration of the angle measuring device.

Therefore, before measuring the displacement of the punch actually used for bending, a calibration mold having a tip at a true center position and having a known tip angle is attached, and a mold tip angle measuring device is used. Are brought into contact with each other to calibrate the measurement values obtained by the mold tip angle measuring device when the mold is at the true center position.

In the plate bending machine according to the third aspect of the present invention, the die mounting position error detecting device is configured to abut a back gauge device provided inside the plate bending machine to abut the work processing position. Position of the die mounted on the upper table and the die mounted on the lower table, and the die mounting position error in a plate bending machine for bending a work by cooperation of the punch and the die. An arm member having a known length provided in a stretch that movably supports the abutment behind the die in a direction parallel to the longitudinal direction of the die, the arm member having a known length, and a tip of the punch. A pair of mold tip angle measuring instruments provided at a predetermined angle at the tip of the arm member to measure the position and angle, and a pair of mold tip angle measuring instruments Is to characterized in that it comprises a control device for calculating a deviation of the upper table center punch center position from the position and angle of the front and rear surfaces of the tip of the constant has been punched, the.

Therefore, when the bending position of the workpiece, which is the workpiece, is positioned below the punch by abutment of the back gauge device, a pair of mold tips having a center at a true center position and having a known angle. The position and angle of the front and rear surfaces of the tip of the punch are measured by an angle measuring device, and the control device determines the deviation from the true center position of the punch from the measured position and angle.

According to a fourth aspect of the present invention, there is provided an apparatus for detecting a mounting error of a die in a plate bending machine, wherein the die tip angle measuring device according to the third aspect is mounted at a predetermined angle to the tip of the arm member. A pair of containers, a probe provided inside and outside of the container so as to be freely retractable and rotatable to some extent, and a position where each probe is constantly urged in a pushing direction and each probe is indicated. A pair of urging members provided at predetermined intervals to provide the urging member measuring device for measuring the positions of the pair of urging members is provided.

Accordingly, when the arm member is set and the mold tip angle measuring device provided at the tip of the arm member is brought into contact with the tip end surface of the punch, the tool is provided inside the container of the mold tip angle measuring device. When the tip of the punch comes into contact with the probe protruded by the biasing member, the probe comes and goes along the tip surface of the punch. The position of the probe at this time is measured by a biasing member measuring device provided at a predetermined interval, and a deviation of the punch tip position is calculated based on the measured value and a distance between the probes, and the value of the deviation is calculated. The position of the abutment is automatically adjusted based on.

According to a fifth aspect of the present invention, there is provided a method for automatically setting the origin of a back gauge abutment in a sheet material bending machine, wherein the workpiece is processed by contacting a back gage abutment provided inside the sheet material bending machine. Automatic setting of the origin of the back gauge abutment in a sheet bending machine that performs bending work on a work by cooperating with the punch and the die by positioning the punch at the position of the punch mounted on the upper table and the die mounted on the lower table In the method, the positions and angles of the front and rear surfaces of the punch tip are measured by a pair of mold tip angle measuring instruments having a center at a true center position and having a known angle, and the measured positions of the front and rear surfaces of the punch tip and A shift in the position of the tip of the punch is obtained from the angle, and the abutting position is automatically determined in consideration of the obtained shift.

Therefore, when the bending position of the workpiece to be processed is positioned below the punch by abutment of the back gauge device, a pair of mold tips having a center at a true center position and having a known angle. The position and angle of the front and rear surfaces of the tip of the punch are measured by an angle measuring device, the deviation from the true center position of the punch is determined from the measured position and angle, and the abutment position is adjusted based on the value of the deviation. .

According to a sixth aspect of the present invention, there is provided a method for automatically setting the origin of a back gauge abutment in a sheet bending machine according to a fifth aspect of the present invention. The position and angle of the mold tip angle measuring device are measured by bringing the mold tip angle measuring device into contact with a calibration mold accurately mounted at the center of the upper table and having known angles at both ends of the tip. The calibration of the measuring device is performed.

Therefore, before actually measuring the deviation of the punch used for bending, a calibration mold having a tip at a true center position and a tip angle known is attached to the calibration mold. The mold tip angle measuring device is contacted to calibrate the measured value of the mold tip angle measuring device when the mold is at the true center position.

An automatic origin setting device for abutment of a back gauge in the plate bending machine according to the present invention is arranged so as to abut against a back gauge device provided inside the plate bending machine to process a workpiece. Automatic setting of the origin of the back gauge abutment in a sheet bending machine that performs bending work on a work by cooperating with the punch and the die by positioning the punch at the position of the punch mounted on the upper table and the die mounted on the lower table An arm member having a known length provided in a stretch that movably supports the abutment behind the die in a direction parallel to the longitudinal direction of the die, the arm member having a known length, and a tip of the punch. A pair of mold tip angle measuring devices provided at the tip of the arm member at predetermined angles to measure the position and angle, and the pair of mold tip angles The shift of the center of the punch with respect to the center of the upper table is calculated from the positions and angles of the front and rear surfaces of the tip of the punch measured by the measuring device, and the abutment is accurately positioned at a desired position in consideration of the calculated shift. And a control device for moving the stretch back and forth to perform the stretching.

Therefore, when the bending position of the workpiece, which is the workpiece, is positioned below the punch by abutment of the back gauge device, the arm member is rotated and the die tip angle measuring device provided at the tip end is rotated. To the true center position. The front and rear surfaces of the tip of the punch are brought into contact with the mold tip angle measuring device to determine the positions and angles of both surfaces, and the control device calculates the deviation of the tip of the punch based on the determined positions and angles. The control device automatically adjusts the abutting position by moving the stretch back and forth based on the determined shift of the tip of the punch.

According to an eighth aspect of the present invention, there is provided an automatic origin setting device for abutment of a back gauge in a plate bending machine, wherein the die tip angle measuring device according to the seventh aspect is configured such that the tip end of the arm member has a predetermined angle. A pair of containers mounted in the container, a probe provided inside and outside of the container so as to be freely retractable and rotatable to some extent, and each probe is constantly urged in a pushing direction and each probe is It is characterized by comprising a pair of urging members for indicating positions, and an urging member measuring device for measuring the positions of the pair of urging members.

Therefore, when the arm member is set and the punch is brought into contact with the tip surface of the mold tip angle measuring device provided at the tip of the arm member, the punch is provided inside the container of the mold tip angle measuring device. The probe provided in the container of the die tip angle measuring device protruded by the biasing member protrudes and retracts along the tip end surface of the punch. The position of the probe at this time is measured by an urging member measuring device provided at a predetermined interval, and a displacement of the tip of the punch is calculated based on the measured value and a distance between the probes. The position of the butting is determined based on this.

According to a ninth aspect of the present invention, there is provided a method for detecting an error in a mounting position of a mold in a plate bending machine, the method comprising the steps of: abutting an abutment of a back gauge device provided inside the plate bending machine; Position of the die mounted on the upper table and the die mounted on the lower table, and the die mounting position error in a plate bending machine for bending a work by cooperation of the punch and the die. Measuring the position of the inner surface of the die,
The deviation of the center position of the die is obtained from the measured position of the inner surface of the die.

Therefore, when the bending position of the workpiece as the workpiece is positioned at the center of the die by abutment of the back gauge device, the position of the inner surface of the die is measured, and the measured position of the inner surface of the die is measured. The deviation of the die center position is determined in consideration of the distance from the inner surface of the die to the center.

In the sheet bending machine according to the tenth aspect of the present invention, the die mounting position error detecting device is configured to abut a back gauge device provided inside the plate bending machine to abut the work position of the workpiece. Position of the die mounted on the upper table and the die mounted on the lower table, and the die mounting position error in a plate bending machine for bending a work by cooperation of the punch and the die. An arm member having a known length provided in a stretch that supports abutment movably in parallel with the longitudinal direction of the die behind the die and that has a known length, and an inner member of the die. A measuring tool provided at the tip of this arm member to measure the side surface position, and the center of the lower table at the die center position from the position of the die inner side surface measured by this measuring tool A controller for calculating a deviation of and is characterized in that it comprises an.

Therefore, when the bending position of the workpiece, which is the workpiece, is positioned at the center of the die by abutment of the back gauge device, the arm member is rotated to move the measuring tool provided at the tip to the inside of the die. The position of the inner side surface of the die is determined by abutting the side surface, and the controller calculates the deviation of the center of the die based on the determined position.

According to an eleventh aspect of the present invention, there is provided a method for automatically setting the origin of a back gauge abutment in a sheet bending machine, wherein the workpiece is processed by being brought into contact with a back gage abutment provided inside the plate bending machine. Position of the punch mounted on the upper table and the die mounted on the lower table, and automatically sets the origin of the back gauge abutment in a plate bending machine that performs bending on the work in cooperation with the punch and die. Measuring the position of the inner surface of the die, determining a deviation of the die center position from the measured position of the inner surface of the die, and automatically determining the abutting position in consideration of the determined deviation. It is a feature.

Therefore, when positioning the bending position of the workpiece, which is the workpiece, at the center of the die by abutting the back gauge device, the position of the inner surface of the die is measured, and the position of the inner surface of the die is measured. The shift of the die center position is obtained, and the abutting position is automatically determined in consideration of the obtained shift.

The automatic origin setting device for the back gauge abutment in the plate material bending machine according to the twelfth aspect of the present invention is configured to abut the back gage abutment provided inside the plate material bending machine so as to abut the work processing position. Position of the punch mounted on the upper table and the die mounted on the lower table, and automatically sets the origin of the back gauge abutment in a plate bending machine that performs bending on the work in cooperation with the punch and die. An arm member having a known length provided in a stretch that supports abutment movably in parallel with the longitudinal direction of the die behind the die and that has a known length, and an inner member of the die. A measuring tool provided at the tip of the arm member for measuring the side surface position, and a position below the die center position from the position of the inner surface of the die measured by the measuring tool. A controller that calculates a shift with respect to the center of the table and moves the stretch back and forth so as to accurately position the abutment at a desired position in consideration of the calculated shift. It is.

Therefore, when the bending position of the workpiece, which is the workpiece, is positioned at the center of the die by abutment of the back gauge device, the arm member is rotated to move the measuring tool provided at the tip to the inside of the die. The position of the inner side surface of the die is determined by abutting the side surface, and the controller calculates the deviation of the center of the die based on the determined position. The control device automatically adjusts the abutment position by moving the stretch back and forth based on the determined center deviation of the die.

[0039]

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

FIG. 6 shows a press brake 1 as a bending machine. The press brake 1 has a ram 5 as a lower table below the C-shaped frame 3 and an upper table 7 above. A die D is mounted on the upper end of the ram 5, and a punch P is mounted on a lower end of the upper table 7. The ram 5
Is vertically movable by a fluid pressure cylinder or the like (not shown).

On the other hand, behind the die D in the gap G at the center of the C-shaped frame 3 (to the right in FIG. 3).
Is provided with a back gauge device 9. Since the back gauge device 9 is very general, only the outline will be described. The back gauge device 9 has a stretch 13 supported by the support member 11 and movable in the front-rear direction (the left-right direction in FIG. 6). The stretch 13 is provided to extend in the left-right direction (the direction perpendicular to the paper surface in FIG. 6).
An abutment 15 is provided movably in the left-right direction along the stretch 13.

Accordingly, the work W placed on the die D
Is positioned at the center of the die D and the punch P by bringing the tip into contact with the abutment 15.
Under the control of the C device 16, the ram 5 is raised by a fluid pressure cylinder or the like (not shown) and is bent in cooperation with the punch P.

Referring to FIG. 1, in the bending process described above, when the center position of the punch P and the die D is shifted from the true origin position, the mounting position error of the punch P and the die D is detected. A detection device 17 is shown.

The mounting position error detecting device 17 is provided with a bump 15 on the support member 11 of the back gauge device 9.
Arm member 19 is provided in the vicinity of the
As in the case of, it is movable in the left and right direction along the stretch 13. For this reason, for a process in which a plurality of dies are mounted (step bend), the center position can be detected by moving the die to a desired position of the punch P.

The arm member 19 has a known length in advance, and is rotatable up and down around a pin 23 by a rotation cylinder 21. Further, a pair of mold tip center position detecting members 25 are provided at the tip of the arm member 19.

Therefore, when the arm member 19 is rotated forward (leftward in FIG. 1) by the rotating cylinder 21,
Since the die tip center position detecting member 25 is set at a predetermined position, the center position of the punch P can be measured. Further, at the time of bending, the arm member 19 is rotated upward by the rotation cylinder 21 and retracted so as not to hinder the processing.

FIG. 2 shows the structure of the die tip center position detecting member 25. The mold tip center position detecting member 25 has a pair of containers 27 fixed at a predetermined angle to the above-mentioned arm member 19, and a probe 29 abutting on the punch P appears inside the container 27. It is provided freely. The probe 29 is provided so as to be freely retractable and rotatable by a rotating pin 31 provided near the tip of the container 27, and the bottom surface 33 of the probe 29 is urged by a spring 35 in a direction in which the probe 29 always projects. Are supported by the two positioning pins 37. The container 27 is provided with a position detector 39 such as a linear encoder, and the position of each positioning pin 37 is measured.

Therefore, when the probe 29 is brought into contact with the front end face 41 of the punch P, the probe 29 reciprocates and rotates according to the front end face 41 of the punch P, so that the positioning pin 37 moves. The position of the positioning pin 37 at this time is detected by the position detector 39, and the punch P
Of the center of the tip of the camera.

Next, referring to FIG.
The principle of detecting the center position of the punch P from the position 9 will be described.

Here, the angle of the tip of the punch P is defined as Pθ, the angle formed by the mold tip center position detecting member 25 (ie, the angle formed by the tip surfaces before the pair of probes 29 moves) is defined as θ, and The rotation angle of the central axis of P is Pθ ′,
S11, S21, S31, S
41, assuming distances df1 and db1 between the pins, Pθ =
Pθf + Pθb, Pθf = θ / 2−tan ⁻¹ {(S11−
S21) / df1}, Pθb = θ / 2 + tan ⁻¹ } (S4
1-S31) / db1}.

On the other hand, Pθ ′ = (Pθb−Pθf) / 2 is obtained from Pθ ′ + Pθf = Pθb−Pθ ′. Substituting the aforementioned Pθb and Pθf, Pθ ′ = tan
^-1 ｛S11-S21) / df1 = tan ^-1 ｛S41-S3
1) / db1.

From the angle on the left side of the center line in FIG.
2 = Pθf + Pθ ′ = (Pθf + Pθb) / 2 or similarly from the right angle, Pθ / 2 = (Pθf + Pθ
b) is obtained.

S21 '= S21-ef1tan Pθ
'-Ef1tan {(θ-Pθ) / 2}, S41' = S4
1−eb1tan Pθ′−eb1tan ｛(θ−Pθ) /
2｝ is obtained. Also, from FIG. 3, Y + S41 ′ = S2
Since Y = (S21′−S41 ′) / 2 from 1′−Y, a center shift α can be obtained from α = √2 · Y. That is,

Α = √2 · (S21′−S41 ′) / 2 = (1 / √2) · ｛S21−S41− (tan Pθ′−tan (θ−Pθ) / 2) (ef1-eb1) ｝ ... (1) is obtained. Here, when the central axis of the punch P is not inclined, it goes without saying that Pθ ′ = 0 may be set.

Next, a procedure for obtaining the mounting position error α of the punch P based on the above-described concept and automatically setting the origin of the butting 15 of the back gauge device 9 will be described.

First, as shown in FIG. 4, the calibration punch 43 is mounted on the upper table 7 before the tip position error of the punch P is detected, and the calibration punch 43 is attached to the die tip center position. The detection member 25 is engaged. The calibration punch 43 includes:
As shown in FIG. 5, since two stages of engagement grooves 45 having depths C ₁ and C ₂ are provided, it is possible to engage the pair of probes 29 of the mold tip center position detecting member 25. Thus, the position of the probe 29 when the tip of the punch P is at the true origin position is obtained. At this time, the position of the probe 29 is detected by the position detector 39 and stored as the position S1 to S4 of each pin.

When the calibration is completed, the punch P used for the actual processing is mounted on the upper table 7, and the die tip center position detecting member 25 is engaged in the same manner as in the above-described calibration. The position of each probe 29 at this time is detected by the position detector 39. The value of the pin S1 is S11, the value of the pin S2 is S21, the value of the pin S3 is S31, and the value of the pin S4 is S41.

Obtained S11, S21, S31, S41
And a predetermined value such as θ or Pθ, the deviation α of the punch P is obtained from the equation (1). NC device 1
In step 6, the position of the abutment 15 of the back gauge device 9 is automatically adjusted using the obtained value of α, and the distance between the center of the punch P and the abutment 15 is accurately set to a predetermined value. Is bent.

From the above results, the position of the abutment 15 of the back gauge device 9 is determined in consideration of the elongation of the work W and the error α between the tip positions of the punches P, so that highly accurate bending can be performed. it can.

Further, since the mold tip center position detecting member 25 is retractable, it does not hinder processing.

FIG. 7 shows a mold mounting position error detecting device 47 according to another embodiment. In the mounting position error detecting device 47, the arm member 49
The measuring tool 51 is attached to the tip of the arm member 49. The measuring tool 51 measures the center position of the die D by making contact with the inner side surface 53 of the die D.

Referring to FIG. 7 and FIG. 8, the error α of the center position of the die D is obtained from α = La−bc ′ − (W ₁ or W ₂ ). Here, L is a value fixed at the time of the automatic origin, a and b are fixed values by the butting 15, and c 'is a measured value of the die D in use.

As described above, the inner surface 53 of the die D is accurately measured by the measuring tool 51, and the position of the butting 15 of the back gauge device 9 is automatically determined by using the measurement result. Bending can be performed.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0064]

As described above, according to the method for detecting an error in the mounting position of the die in the plate bending machine according to the first aspect of the present invention, the bending position of the workpiece to be processed is determined by abutment of the back gauge device. When positioning below the punch, the positions and angles of both sides of the tip of the punch are measured by a pair of mold tip angle measuring instruments having a center at the true center position and having a known angle, and the measurement position and angle are measured. From the true center position of the punch,
The deviation of the tip position of the punch can be accurately obtained.

In the method for detecting a die mounting position error in a plate material bending machine according to the second aspect of the present invention, a tip is provided at a true center position before measuring a deviation of a punch actually used for bending. A calibration die with a known tip angle is attached, the tip angle measuring device is brought into contact, and the measured value by the tip angle measuring device when the mold is at the true center position is calibrated. Therefore, the deviation from the true center position can be accurately obtained.

In the apparatus for detecting a die mounting position error in a plate bending machine according to the third aspect of the present invention, when a bending position of a workpiece to be processed is positioned below a punch by abutment of a back gauge device. The positions and angles of both sides of the tip of the punch are measured by a pair of mold tip angle measuring instruments having a center at the true center position and having a known angle, and from the measured position and angle, from the true center position of the punch. , The deviation of the leading end position of the punch can be accurately determined.

According to a fourth aspect of the present invention, there is provided an apparatus for detecting a mounting error of a mold in a plate bending machine, wherein a tip is provided at a true center position before measuring a deviation of a punch actually used for bending. Attach a calibration die with a known tip angle, abut the mold tip angle measuring device to this calibration mold, and in the mold tip angle measuring device when the mold is at the true center position Since the calibration of the measured value is performed, the deviation of the tip of the punch from the true center position can be accurately obtained.

According to the fifth aspect of the present invention, in the method for automatically setting the origin of the back gauge abutment in the plate bending machine, the bending position of the workpiece to be processed is positioned below the punch by the abutment of the back gage device. The positions and angles of both sides of the tip of the punch are measured by a pair of mold tip angle measuring instruments having a center at the true center position and having a known angle, and from the measured position and angle, from the true center position of the punch. Is determined, and the position of the abutment is automatically adjusted based on the value of the shift, so that the work can be accurately adjusted to the bending position by contacting the work with the abutment. This makes it possible to perform high-precision bending.

According to a sixth aspect of the present invention, in the method of automatically setting the origin of the back gauge abutment in the plate bending machine, the arm member is set, and the mold tip angle measuring device provided at the tip end of the arm member is used for the punching. When the probe comes into contact with the tip surface, the probe provided inside the container of the mold tip angle measuring device and protruded by the urging member is protruded and retracted along the tip surface of the punch when the tip of the punch abuts. Become.
The position of the probe at this time is measured by a biasing member measuring device provided at a predetermined interval, and a deviation of the punch tip position is calculated based on the measured value and a distance between the probes, and the value of the deviation is calculated. The position of the abutment is automatically adjusted on the basis of the above, so that the workpiece can be accurately bent at the tip position of the punch by abutting the work on the abutment. This makes it possible to perform high-precision bending.

In the apparatus for automatically setting the origin of the back gauge abutment in the plate bending machine according to the seventh aspect of the invention, when the bending position of the workpiece to be processed is positioned below the punch by the abutment of the back gauge apparatus. Then, the arm member is rotated to set the mold tip angle measuring device provided at the tip at the true center position. The front and rear surfaces of the tip of the punch are brought into contact with the mold tip angle measuring device to determine the positions and angles of both surfaces, and the control device calculates the deviation of the tip of the punch based on the determined positions and angles. The control device automatically adjusts the abutment position by moving the stretch back and forth based on the determined deviation of the punch tip, so that the workpiece can be accurately bent to the punch tip position by abutting the workpiece on the abutment. Can be combined. This makes it possible to perform high-precision bending. Further, at the time of processing, the arm member is rotated upward and retracted, so that it does not hinder processing.

In the automatic origin setting device for abutment of the back gauge in the plate bending machine according to the eighth aspect of the present invention, the arm member is set, and the tip end face of the mold tip angle measuring device provided at the tip end of the arm member. When the punch is brought into contact with the probe, the probe provided inside the container of the mold tip angle measuring device and protruded by the urging member comes and goes along the tip face of the punch. The position of the probe at this time is measured by an urging member measuring device provided at a predetermined interval, and a displacement of the tip of the punch is calculated based on the measured value and a distance between the probes. Since the position of the abutment is determined based on the abutment, the work can be accurately adjusted to the bending position of the punch by abutting the work on the abutment. This makes it possible to perform high-precision bending.

According to a ninth aspect of the present invention, there is provided a method for detecting a mounting error of a mold in a plate bending machine, wherein a bending position of a workpiece to be processed is positioned at the center of a die by abutment of a back gauge device. The position of the inner surface of the die is measured, and the deviation of the die center position is determined in consideration of the distance from the measured position of the inner surface of the die to the center of the die, so that the center of the die is accurately determined. Can be.

According to the tenth aspect of the present invention, there is provided an apparatus for detecting a mounting position error of a die in a plate material bending machine, wherein a bending position of a workpiece to be processed is positioned at the center of a die by abutment of a back gauge device. The position of the inner surface of the die is determined by rotating the arm member to bring the measuring tool provided at the tip into contact with the inner surface of the die, and the control device determines the position of the center of the die based on the determined position. Since the displacement is calculated, the center of the die can be accurately obtained.

According to the eleventh aspect of the present invention, in the method of automatically setting the origin of the back gauge abutment in the plate bending machine, the bending position of the workpiece to be processed is positioned at the center of the die by the abutment of the back gauge device. The position of the inner surface of the die is measured, the deviation of the die center position is determined from the measured position of the inner surface of the die, and the abutting position is automatically determined in consideration of the determined deviation. The workpiece can be precisely bent at the center position of the die. This makes it possible to perform high-precision bending.

In the apparatus for automatically setting the origin of the back gauge abutment in the plate bending machine according to the twelfth aspect of the present invention, when the bending position of the workpiece, which is the workpiece, is positioned at the center of the die by the abutment of the back gauge apparatus. The position of the inner surface of the die is determined by rotating the arm member to bring the measuring tool provided at the tip into contact with the inner surface of the die, and the control device determines the position of the center of the die based on the determined position. The shift is calculated, and the controller moves the stretch back and forth based on the determined shift of the center of the die, and automatically adjusts the abutment position. Can be adjusted to the center position of the die. This makes it possible to perform high-precision bending.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an automatic origin setting device for a back gauge butting according to the present invention.

FIG. 2 is a sectional view showing a probe and the like as a mold tip angle measuring device.

FIG. 3 is an explanatory view showing the principle of a method of detecting a mounting position error of a mold in the plate bending machine according to the present invention.

FIG. 4 is an explanatory view showing calibration of a mold tip angle measuring device.

FIG. 5 is a partially omitted perspective view showing a calibration mold.

FIG. 6 is a side view showing a press brake as a plate bending machine.

FIG. 7 is a configuration diagram showing another embodiment of the automatic origin setting device for back gauge abutment according to the present invention.

FIG. 8 is a cross-sectional view showing a die whose center position is shifted.

FIG. 9 is a side view showing abutment of a back gauge in a conventional general press brake.

FIG. 10 is a cross-sectional view showing a product that has been bent by a conventional general press brake.

11 (A), (B), and (C) are step diagrams showing a procedure for bending the product shown in FIG. 10;

FIG. 12 is a cross-sectional view showing a product which has been bent by a conventional general press brake.

13 (A), (B), (C) and (D) show FIG.
3 is a step diagram showing a procedure for bending the product shown in FIG.

FIG. 14 is a cross-sectional view showing an off-center punch.

[Explanation of symbols]

 Reference Signs List 1 press brake (bending machine) 5 ram (lower table) 7 upper table 9 back gauge device 13 stretch 19, 49 arm member 27 container 29 probe (mold tip angle measuring device) 35 spring (biasing member) 39 position detection Container (biasing member measuring device) 43 Calibration mold W Work P Punch D Die NC controller

Claims (12)

[Claims] An abutment of a back gauge device provided inside a plate material bending machine is used to position a work to be processed at a position of a punch mounted on an upper table and a position of a die mounted on a lower table. In the method for detecting a mounting position error of a mold in a plate bending machine for bending a work by cooperation of a punch and a die, a pair of metal having a center at a true center position and having a known angle is provided. Using a die tip angle measuring device to measure the position and angle of the front and rear surfaces of the punch tip and determine the deviation of the punch tip position from the measured positions and angles of the front and rear surfaces of the punch tip. Method for detecting the mold mounting position error in the above. 2. Before calibration of the position and angle of the front and rear faces of the punch tip by the mold tip angle measuring device, the calibration tip is accurately mounted on the center of the upper table and the angles of the front and rear faces are known. The plate material bending machine according to claim 1, wherein the mold tip angle measuring device is brought into contact with a mold to measure a position and an angle, and the mold tip angle measuring device is calibrated. A method for detecting errors in the mold mounting position. 3. A processing position of a workpiece is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by abutting against abutment of a back gauge device provided inside a plate bending machine. An apparatus for detecting a mounting position error of a die in a plate material bending machine for performing a bending process on a workpiece by cooperation of the punch and the die, the movable device being movable in parallel with a longitudinal direction of the die behind the die. An arm member having a known length and being provided rotatably in a vertical direction in a stretch supporting the abutment, and holding a predetermined angle at the tip of the arm member to measure the tip position and angle of the punch. A pair of mold tip angle measuring devices provided and an upper part of the punch center position based on the positions and angles of the front and rear surfaces of the tip of the punch measured by the pair of mold tip angle measuring devices. A control device for calculating a deviation from a center of a table, and a device for detecting a mounting position error of a mold in a plate bending machine. 4. A pair of containers attached at a predetermined angle to a tip of the arm member, wherein the mold tip angle measuring device is provided so as to be able to protrude and retract from the containers and rotate to some extent inside each of the containers. A probe provided, a pair of biasing members provided at predetermined intervals to constantly bias each probe in a pushing direction and indicating a position of each probe; and a position of the pair of biasing members. 4. An urging member measuring device for measuring the pressure.
An apparatus for detecting a mounting position error of a die in the plate bending machine according to the above. 5. A processing position of a workpiece is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by making contact with an abutment of a back gauge device provided inside a plate bending machine. Then, in the method of automatically setting the origin of the back gauge abutment in a plate bending machine for bending a work in cooperation with the punch and the die, a pair of gold having a center at a true center position and having a known angle. The position and angle of the front and rear surfaces of the punch tip are measured by a die tip angle measuring device, the deviation of the punch tip position is determined from the measured positions and angles of both surfaces of the punch tip, and the protrusion is considered in consideration of the determined deviation. A method of automatically setting the origin of a back gauge abutment in a sheet bending machine, characterized by automatically determining a contact position. 6. A calibration tool which is accurately mounted on the center of an upper table and has a known angle between the front and rear surfaces of the punch before the position and angle of the front and rear surfaces of the front end of the punch are measured by the mold front angle measuring device. The plate material bending machine according to claim 5, wherein the position and angle are measured by bringing the mold tip angle measuring device into contact with a mold, and the mold tip angle measuring device is calibrated. Automatic setting method of origin of back gauge collision. 7. A processing position of a workpiece is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by making contact with an abutment of a back gauge device provided inside a plate material bending machine. An automatic origin setting device for a back gauge abutment in a plate material bending machine that performs a bending process on a work by cooperation of the punch and the die, and is movable in parallel with a longitudinal direction of the die behind the die. An arm member having a known length and being provided rotatably in a vertical direction in a stretch supporting the abutment, and holding a predetermined angle at the tip of the arm member to measure the tip position and angle of the punch. A pair of mold tip angle measuring devices provided, and a punch center position from positions and angles of front and rear surfaces of the tip of the punch measured by the pair of mold tip angle measuring devices. A controller that calculates a shift with respect to the center of the upper table and moves the stretch back and forth to accurately position the abutment at a desired position in consideration of the calculated shift. Automatic origin setting device for back gauge abutment in sheet bending machines. 8. A pair of containers attached to the tip of the arm member at a predetermined angle, wherein the mold tip angle measuring device is provided so as to be able to protrude and retract from the containers and rotate to some extent inside each of the containers. A probe provided, a pair of biasing members for constantly biasing each probe in a pushing direction and indicating the position of each probe, and a biasing member measurement for measuring the position of the pair of biasing members An apparatus for automatically setting the origin of a back gauge abutment in a sheet bending machine according to claim 7, comprising: a device. 9. A work position of a work is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by abutting against an abutment of a back gauge device provided inside a plate material bending machine. In a method for detecting a mounting position error of a mold in a plate material bending machine for performing a bending process on a work in cooperation with the punch and the die, the position of the inner surface of the die is measured, and the measured inner surface of the die is measured. A method for detecting an error in the mounting position of a die in a plate material bending machine, wherein a deviation of a die center position is obtained from the position of the die. 10. A work position of a workpiece is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by abutting against an abutment of a back gauge device provided inside a plate bending machine. An apparatus for detecting a mounting position error of a die in a plate material bending machine for performing a bending process on a workpiece by cooperation of the punch and the die, the movable device being movable in parallel with a longitudinal direction of the die behind the die. An arm member having a known length and rotatably provided in the stretch supporting the abutment and having a known length, and a measuring tool provided at the tip of the arm member for measuring the inner surface position of the die, A control device for calculating a deviation of the center position of the die from the center of the lower table from the position of the inner surface of the die measured by the measuring tool. For detecting a mold mounting position error. 11. A work position of a workpiece is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by abutting against an abutment of a back gauge device provided inside a plate bending machine. Then, in the method of automatically setting the origin of the back gauge abutment in a plate bending machine for bending a work in cooperation with the punch and the die, the position of the inner surface of the die is measured, and the measured inner surface of the die is measured. A position of the die center position is determined from the position, and the abutting position is automatically determined in consideration of the determined deviation. 12. A work position of a workpiece is positioned at a position of a punch mounted on an upper table and a position of a die mounted on a lower table by abutting against an abutment of a back gauge device provided inside a plate bending machine. An automatic origin setting device for a back gauge abutment in a plate material bending machine that performs a bending process on a workpiece by cooperation of the punch and the die, and is movable in parallel with a longitudinal direction of the die behind the die. An arm member having a known length and being provided rotatably in a vertical direction in a stretch supporting the abutment,
A measuring tool provided at the tip of the arm member to measure the position of the inner surface of the die, and calculating the deviation of the center of the die from the center of the lower table from the position of the inner surface of the die measured by the measuring tool. A control device for moving the stretch back and forth in order to accurately position the abutment at a desired position in consideration of the calculated displacement, and a back gauge abutment in the plate bending machine. Automatic origin setting device.