JPH10305320A - End deviation alignment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency for bending thin sheets and small materials by keeping the distance between the end and die constant by controlling the position of the end by calculating the current position of the end horn horizontal deviation amount of stretch when the end is moved on the stretch of the back gauge equipment towards longer side of the object. SOLUTION: Each end of the stretch D to which the joint 5 is attached movably in the Y axes direction is connected with Z shaft drive unit C supported by X shaft drive unit A through link mechanism B. The correction value for Z axial direction is obtained from the value of the current position of the end 5 in Y axes direction, and the value of the current position of the end 5 in Z axes direction calculated by the amount of deviation of the stretch D in Z axes direction per certain pitch as the end 5 moves to the Y axes direction. The correction value obtained is added to the Z axes preset value and the stretch D is moved to the Z axial direction. By doing this, deviation in the Z axial direction of the stretch D accompanied by the movement of the joint 5 is adjusted, and the stretch D looks apparently straight and keeps constant distance with the die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for correcting a displacement of a collision, and more particularly to a device for correcting a displacement of a collision in a vertical direction due to a bending of a stretch.

[0002]

2. Description of the Related Art It is well known that a bending machine is generally provided with a back gauge device at a rear portion thereof to position a workpiece before bending.

[0003] As a back gauge device in this case, for example, there is one shown in FIG.

In FIG. 6A, a supporter 67 is provided on both sides of a lower table 69, and a stretch 63 can be moved vertically (Z-axis direction) via a post 64 on each supporter 67. Further, abutment 62 is attached on stretch 63 so as to be movable in the longitudinal direction (Y-axis direction).

In this back gauge device, the work W
As a setup before positioning, first, the X-axis motor Mx is driven, and the abutting 6
2 is determined in the X-axis direction.

[0006] After the setup has been performed in this way, usually, as shown in FIG.
2 and the punch 60 and the die 6
A distance L from the center kc of the mold made of No. 1 is determined, and the work W is bent.

[0007]

However, when the workpiece W is a thin plate and is bent with a small object, that is, when a product having a small flange length is processed, as shown in FIG. It is necessary to set up so that the abutment 62 rests on the die 61.

Moreover, the dimension A of the gap between the abutment 62 and the die 61 must be set to 0.1 mm or less (FIG. 6E).

In this case, if the position of the abutment 62 is slightly lower (FIG. 6 (C)), the abutment 62 interferes with the die 61. D)
To avoid the interference with the die 61.

Therefore, if the stretch 63 on which the abutment 62 is supported is straight, when the abutment 62 moves on the stretch 63 in the longitudinal direction (Y-axis direction) (FIG. 6 (F)), The dimension A of the gap with the die 61 is always constant.

However, the stretch 63 is not necessarily straight in reality, but is bent in the vertical direction (Z-axis direction) due to the influence of an accuracy error or the like (FIG. 6F). That is, assuming that a virtual line when the stretch 63 is assumed to be straight is K, the actual stretch 63 is bent vertically with respect to the virtual line K.

Therefore, the die 6 of the abutment 62 at a certain height position
Even if the dimension A with respect to 1 is 0.1 mm or less, if the abutment 62 moves on the stretch 63 in the longitudinal direction, it will be shifted by ΔA1 and ΔA2 with respect to the virtual line K.
As a result, the dimension A of the gap between the abutment 62 and the die 61 changes depending on the position of the abutment 62 in the Y-axis direction.

As a result, if the dimension A is too small, the impact 6
2 interferes with the die 61 (FIG. 6 (C)).
Is too large, the work W cannot be abutted. The dimension A of the gap between the abutment 62 and the die 61 (FIG. 6E) is the abutment 62 in the case of bending a thin plate / small object.
This has the greatest effect on the setup, and as described above, if the dimension A is not constant, the working efficiency of bending a thin plate / small object is reduced.

An object of the present invention is to correct vertical displacement of abutment caused by bending of a stretch,
An object of the present invention is to maintain the dimension of the gap between the abutment and the die constant to improve the processing efficiency of bending a thin plate or small object.

[0015]

According to the present invention, when the abutment 5 moves in the Y-axis direction on the stretch D movable in the X-axis direction and the Z-axis direction, the abutment 5 is stretched and bent. Is shifted in the Z-axis direction, the current position Z _{L of} the abutment 5 in the Z-axis direction based on the shift amounts z ₁ and z ₂ in the Z-axis direction of the stretch D for each constant pitch b. a current position calculating means 51 for calculating a Z _R, the current position Y _L of the Y-axis direction, Y current position Z _L of the _R and the calculated Z-axis direction, based on the Z _R, the correction value of the Z-axis direction C _L
(3b), correction value calculating means 5 for calculating C _R (−3b)
1, the calculated out correction value _{C L (3b), C R} (-3b)
The target value Z _OL in the Z-axis direction, the command value D _L obtained by adding the Z _OR,
The D _R, a position control means 5100 butting moving the stretch D in the Z-axis direction to support the 5 butting.

[0016] Therefore, according to the configuration of the present invention, the correction value _{C L (3b), C R} (-3b) the target value Z _OL, command values D _L and added to Z _OR, the D _R, abutment 5 Is moved in the Z-axis direction, the displacement of the abutment 5 in the Z-axis direction caused by the Y-axis movement of the abutment 5 is corrected, and the stretch D is apparently straightened. Regardless of the position in the Y-axis direction, the dimension A of the gap with the die is (see FIG. 5).
(C)) It becomes constant, and the processing efficiency of thin plate / small object bending is improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings according to embodiments. FIG. 1 is a diagram showing an embodiment of the present invention.

The apparatus shown in FIG. 1 comprises an input unit 50, a control unit 51, a storage unit 52, an NC 53, and a processing unit 54.

The input unit 50 is, for example, a keyboard.
This is an apparatus for inputting a program including a model of a bending machine used in the present invention, processing conditions such as a thickness of a thin plate work, a flange dimension, and the like, and a procedure (FIG. 2) of a correction method according to the present invention.

Among the above processing conditions, there is a pitch constant described later.
Numbers a and b (FIG. 3 (B)) and the Z direction of stretch D
Deviation z₁ , Z_Two , The current position of the abutment 5 in the Y axis direction
Y_L, Y _REtc. are also included.

The control unit 51 is, for example, a CPU, and calculates a command value for moving the abutment 5 (FIGS. 4 and 5) to a predetermined position based on the input signal S1 from the input unit 50. , The control signal S3 corresponding to the command value
Send to 53. In addition, the control unit 51 controls the entire apparatus illustrated in FIG.

The storage unit 52 temporarily stores the processing conditions and the program input from the input unit 50, and the control unit 51 reads the processing conditions and the program (signal S2) to calculate a command value.

The NC 53 numerically controls the next processing section 54 based on the control signal S3 transmitted from the control section 51.

The processing section 54 is specifically a back gauge device using a link mechanism B as shown in FIG. 4, for example.

FIG. 4 shows a case where the back gauge device is applied to a press brake which is a bending machine. FIG. 4 is a perspective view seen from the rear of the press brake. The axial direction and the vertical direction are defined as the Z-axis direction.

The press brake shown in FIG. 4 has a lower table 2 arranged in parallel with the Y-axis direction, and an upper table 1 is provided directly above the lower table 2.
The punch (not shown) mounted on the lower table 2 and the die (not shown) mounted on the lower table 2 cooperate to form a thin plate
Small item bending is performed.

As shown, a back gauge device provided with a stretch D is provided at the rear of the press brake. The stretch D has a Y-axis motor My (not shown).
As a result, an abutment 5 movable in the Y-axis direction is attached.

The stretch D connects the Z-axis driving mechanisms C at both ends, and the Z-axis driving mechanism C
It is supported by the shaft drive mechanism A.

The link mechanism B is such that the center portions of the links 3 and 4 are crossed and connected by a pin 34, and are extendable and contractible in the Z-axis direction, and the lower ends thereof are hinges 9A and 10A.
And the upper end thereof is pivotally connected to the Z-axis drive mechanism C by hinges 15A and 16A.

The X-axis drive mechanism A includes support members 18 and 6
X-axis motor Mx fixed to lower table 2 through
A ball screw 8 coupled to the X-axis motor Mx;
An X-axis drive block 10 that is screwed into the ball screw 8 and moves along the X-axis rail 7, and an X-axis driven block 9 that moves along the X-axis rail 7 according to the movement of the X-axis drive block 10. ing.

Therefore, by controlling the NC 53 (control signal S4 in FIG. 1), the X-axis motor Mx is driven, and the link mechanism B is moved in the X-axis direction as shown in FIG. X1) The entire stretch D is moved in the X-axis direction, whereby the abutment 5 can also be moved in the X-axis direction.

The Z-axis drive mechanism C includes a Z-axis motor Mz fixed to the support member 12, a ball screw 14 connected to the Z-axis motor Mz, It is composed of a Z-axis drive block 15 that moves along the axis rail 13 and a Z-axis fixing block 16 through which a ball screw 14 passes and is fixed to the support member 12.

Therefore, under the control of the NC 53 (control signal S4 in FIG. 1), the Z-axis motor Mz is driven, and as shown in FIG. 5C, the Z-axis drive block 15, the Z-axis fixed block 16, and X Axis driven block 9 and X-axis drive block 10
Are moved toward and away from each other (arrows X2 and X3), and the entire stretch D is moved in the Z-axis direction by extending and contracting the link mechanism B (arrow Z1), whereby the abutment 5 can also be moved in the Z-axis direction. it can.

Further, since the stretch D is bent in the vertical direction (Z-axis direction), a curve representing the stretch D, that is, a stretch curve f becomes as shown in FIG.
The abutment 5 moves in the Y-axis direction (longitudinal direction) along the stretch curve f.

Hereinafter, the operation of the present invention in such a back gauge device will be described with reference to FIGS.

(1) Movement of the abutment 5 in the X-axis direction and the Y-axis direction First, in step 101 in FIG. 2, the abutment 5 is moved in the X-axis direction (front-back direction) and the Y-axis direction (longitudinal direction). .

In this case, the target value P _L (X _OL , Y
_{OL, Z OL), P R} (X OR, Y OR, Z OR) are (Figure 3
(A)), the control unit 51 recognizes in advance.

Accordingly, the control unit 51 calculates a command value to move the butting 5 to a target value in the X-axis direction and the Y-axis direction,
The NC 53 that has received the command value as the control signal S3 converts the command value into a pulse train, and converts the pulse train into a control signal S4 with the X-axis motor Mx of the back gauge device (FIG. When transmitted to the Y-axis motor My (not shown), the X-axis motor Mx and the Y-axis motor M
By y, the link mechanism B supporting the butting 5 moves in the X-axis direction (arrow X1 in FIG. 5B) and the Y-axis direction (arrows Y1 and Y2 in FIG. 5A).

Thus, the abutment 5 can reach a predetermined target value in the X-axis direction and a target value in the Y-axis direction.

(2) Movement of the abutment 5 in the Z-axis direction Next, the abutment 5 is moved in the Z-axis direction, that is, in the up-and-down direction. Since the position of the abutment 5 is shifted in the Z-axis direction (FIG. 3), the position shift is corrected as follows.

First, in step 102, pitch constants a and b, which will be described later, and shift amounts z ₁ and z ₂ of the stretch D in the Z-axis direction with respect to the virtual line K are input to the control unit 51.

In this case, the control unit 51 reads the processing conditions from the storage unit 52 (signal S2 in FIG. 1), thereby determining the pitch constants a and b and the shift amounts z ₁ and z ₂ (FIG. 3A,
FIG. 3 (B)) is input.

FIG. 3A shows a back gauge apparatus similar to that of FIG. 4, in which the mechanical center MC is set to the Z axis, the virtual line K when the stretch D is assumed to be straight, the Y axis, The target value P _{L of the} fifth (X _OL , Y _OL , Z _OL ),
_{P R (X OR, Y OR} , Z OR) with respect to the current position Q _L (X _L when each abutting 5 moves on the stretch curve f, Y
_{L, Z L), Q R} (X R, Y R, is an elevational view showing a Z _R).

However, in order to simplify the drawing, FIG.
In the back gauge device (A), unlike FIG.
The position of the Z-axis motor Mz is matched with the position of the virtual line K.

FIG. 3B is an enlarged view of a broken line portion E in FIG. 3A.

In FIG. 3A, the distance from the machine center MC to both X-axis driving mechanisms A (FIG. 4) is 3b, and 1
The length of the pitch is represented by b (FIG. 3B).

In FIG. 3B, if the intersection between the stretch curve f and one of the bitch ends b1 is α and the intersection of the other bitch end b2 is γ, these intersections α and γ
Are the shift amounts z ₁ and z ₂ of the stretch D in the Z-axis direction with respect to the virtual line K.

If the distance between the position Y _{L of} the abutment 5 in the Y-axis direction and the one bitch end b1 is a, this a
And the pitch length b is the pitch constants a and b described above.

The pitch constants a and b and the displacement amounts z ₁ and z ₂ of the stretch D in the Z-axis direction with respect to the virtual line K
Are known in advance, and these are input to the control unit 2.

Next, in step 103, the current positions Z _L and Z _R of the abutment 5 in the Z-axis direction are obtained.

That is, in FIG. 3B, {αβγ and △
Since αδε is obviously similar, the following equation holds.

B / (z ₁ + z ₂ ) = a / (z ₁ + Z _L )

Solving for Z _L , Z _L = {(ab) z ₁ + az ₂ } / b...

Thus, for the left butting 5, Z
Obtain the current position Z _L in the axial direction.

Similarly, for the right abutment 5, the current position Z _R in the Z-axis direction can be obtained.

That is, regarding the right abutment 5, the left abutment 5
A and b are the same, but the virtual line K
Of the stretch D in the Z-axis direction with respect to z ₁ , z ₂
Equations that differ only in this case hold.

[0057] From The thus obtained Z _L and Z _R, and the known Y _L and Y _R, the current position Q _L, Q _R is seen.

As apparent from FIG. 3B, the abutment 5 actually moves in the Y-axis direction along the stretch curve f, but passes through the points α and γ in the pitch section. was regarded as 5 abutting on the straight line g1 moves, the Z _L and Z _R obtained by using this approximation straight line g1, and the current position of the Z-axis direction of the abutment 5.

[0059] Then, in step 104, the current position Q _L of the abutment 5, based on Q _R, the correction value C _L (3
b), C _R (−3b) is obtained.

In this case, a straight line passing through the two points of the current position (Z _L , Y _L ) and (Z _R , Y _R ) in the Z-axis direction and the Y-axis direction of the abutment 5 is as follows.

Y (z) = {(Y _L −Y _R ) / (Z _L −Z _R )} (z−Z _L ) + Y _L.

Incidentally, in the equation, if z = Z _L , y = Y _L , and if z = Z _R , y = Y _R.

As described above, FIG.
The straight line g of (A) was obtained.

When the above equation is solved for z, z = {(Y _L −Y _R ) / (Z _L −Z _R )} (y−Z _L ) + Z _L.

In this equation, by substituting y = 3b, -3b, the correction values C _L (3b), C _R (-3
b) becomes as follows.

C _L (3b) = {(Y _L −Y _R ) / (Z _L −Z _R )} (3b−Z _L ) + Z _L ... C _R (−3b) = _L (Y _L −Y _{R) / (Z L -Z R} )} (- 3b-Z L) + Z L ···

As is clear from FIG. 3A, the above equation is the correction value for the left collision 5 and the equation is the correction value for the right collision 5.

The correction values C _L (3b) and C _R (-3b)
It is located both abutment 5 NOW _{Q L (X L, Y L} , Z L), Q
_{R (X R, Y R,} Z R) is the correction value of the Z-axis direction when in the.

Therefore, in step 105, the command values D _L and D _R are obtained by considering the correction values C _L (3b) and C _R (-3b).

[0070] That is, the control unit 51 calculates the target value Z _OL, Z _OR on the correction value C _L (3b), by adding the C _R (-3b), following the command value D _L, the D _R I do.

D _L = Z _OL + C _L (3b)... D _R = Z _OR -C _R (-3b).

The command values D _L and D _R correspond to the amount of movement of the link mechanism B in the Z-axis direction.
_Calculates the target values Z _OL and Z _OR to the correction values _CL (3b) and _CR (−
3b) by shifting the Z-axis motor Mz and drives the link mechanism B, instruction value D _L from the current position, it is moved to the position of D _R.

[0073] In other words, the command value D _L, meaning of D _R is
3 by moving the link mechanism B in the Z-axis direction.
In (A), the straight line g is made to coincide with the virtual line K, whereby the two-end striking 5 is performed in the Z axis direction with the target value Z _OL ,
Reach Z _OR .

[0074] Thus, in step 106, the control unit 51 transmits the command value D _L, the D _R to NC53, N
C53 inputs this to the conversion to Z-axis motor Mz to the pulse train, moving in step 107, the Z-axis motor Mz is the link mechanism B, the command value D _L from the current position, the Z-axis direction to the position D _R As a result, the two butts 5 are moved to the positions of the target values Z _OL and Z _{OR in} the Z-axis direction.

As a result, the collision 5 corrects the displacement in the Z-axis direction, and corrects the target value P _L (X _OL , Y _OL , Z _OL ),
P _R (X _OR , Y _OR , Z _OR ) can be reached.

(3) Positioning and Bending of Work As described above, when the abutment 5 reaches the target values P _L and P _R , in step 108, the work is abutted against the abutment 5 to perform positioning. In step 109, the work is bent to bend a thin plate or small object.

If all the machining is not completed in step 110 (NO), the first step 1
01 and if all the processing is completed (YE
S) Stop the device to end the work (END).

[0078] In the present embodiment, the current position Q _L two points abutment 5, approximate line through Q _R g (FIG. 3 (A))
The case where the correction value is calculated using the above has been described.

However, the present invention is not limited to this, and it is also possible to calculate the above-mentioned correction value by using one stretch bending approximation curve connecting the current positions of the abutments.
In this case, the same effect as that of FIG. 3 can be obtained.

Further, in this embodiment, the back gauge apparatus mainly using the link mechanism B shown in FIG. 4 has been described. However, the present invention is not limited to this. As long as the gage device is of another type, the same effect as that of FIG. 3 can be obtained as a matter of course.

[0081]

As described above, according to the present invention, the striking position deviation correcting device calculates the current position of the striking position in the Z-axis direction from the amount of stretching deviation at every constant pitch.
The stretch supporting the abutment is moved in the Z-axis direction by a command value obtained by adding the correction value calculated based on the current position to the target value. The axial displacement is corrected, the stretch is apparently straight, and the dimension of the gap with the die is constant regardless of the position of the abutment in the Y-axis direction, thereby improving the bending efficiency of thin plates and small objects. The technical effect was achieved.

[0082]

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the present invention.

FIG. 3 is an explanatory diagram of calculation of a current position of a collision and a correction value according to the present invention.

FIG. 4 is a configuration diagram of a back gauge device used in the present invention.

FIG. 5 is an explanatory diagram of a movement of abutting according to the present invention.

FIG. 6 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

50 input unit 51 control unit 52 storage unit 53 NC 54 processing unit K phantom lines a, b pitch constant f stretch curve g correction value approximation for obtaining a straight line Q _L, Q _R abutting the current position P _L, P _R butt Target value C _L (3b), C _R (-3b) Correction value D _L , D _R command value A Y axis drive mechanism B Link mechanism C Z axis drive mechanism D Stretch 1 Upper table 2 Lower table 3, 4 links 5 Abutment 6, 12, 18 Support member 7 X-axis rail 8, 14 Ball screw 9 X-axis driven block 10 X-axis drive block 13 Z-axis rail 15 Z-axis drive block 16 Z-axis fixed block

Claims (4)

[Claims] 1. A back gauge device in which, when a strike moves in the Y-axis direction on a stretch movable in the X-axis direction and the Z-axis direction, the position of the strike shifts in the Z-axis direction due to stretch bending. A current position calculating means for calculating a current position in the Z-axis direction of the abutment based on a shift amount of the stretch in the Z-axis direction for each constant pitch; and a current position in the Y-axis direction and the calculated Z-axis direction. Correction value calculating means for calculating a correction value in the Z-axis direction based on the current position of the Z-axis; and a command value obtained by adding the calculated correction value to a target value in the Z-axis direction. And an abutment position control means for moving the abutment in a direction. 2. The stretcher is moved in the Z-axis direction by a control unit that calculates the current position in the Z-axis direction, a correction value, and a command value, and controls the NC that receives the command value. A device for correcting the displacement of a collision. 3. The apparatus according to claim 1, wherein the correction value is calculated using an approximate straight line passing through the current positions of the two collision points. 4. The apparatus according to claim 1, wherein the correction value is calculated using a stretch bending approximate curve connecting the current positions of the collision.