JPH1123248A - Method and instrument for measuring reference position of spanker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the positioning accuracy of a spanker by obtaining an accurate rotation commanding value to be given to a X-axis motor when the spanker is moved in the vertical direction by measuring the vertical reference positions of the spanker which are decided by using the attaching position of a link mechanism as an origin by means of a back gauge device using the link mechanism. SOLUTION: After the first and second vertical reference positions of 50 mm and 180 mm of a spanker 5 having an origin on a lower table 2 are set, the first and second vertical reference positions (b) and (a) of the spanker 5 which are decided by using the attaching position of a link mechanism B as an origin are found based on the moving stroke of the spanker 5 in the vertical direction and the moving stroke (c) of a Z-axis driving block 15 in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for measuring a reference position of an abutment, and more particularly, to a back gauge device using a link mechanism. The present invention relates to a method and an apparatus for measuring.

[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.

As a back gauge device in this case, for example, there is a device using a link mechanism B shown in FIG.

However, in the back gauge device using the link mechanism B, due to the structure of the link mechanism B, when the abutment 5 is moved in the vertical direction, the Z-axis motor Mz moves in the front-rear direction (Y-axis direction). Moving Z-axis drive block 1
The stroke e of No. 5 had to be calculated by the following conversion formula.

That is, as disclosed in a patent application (Japanese Patent Application No. 9-125533) filed by the applicant of the present invention on May 15, 1997, the links 3, 4 constituting the link mechanism B are disclosed.
Is 230 mm, the lower limit position of the abutment 5 is b, and the upper limit position is a, the moving stroke e of the Z-axis drive block 15 in the front-rear direction is e = √ (230 ² −b ² ) −√ (230 ² −a ² ) (1)

However, in equation (1), the lower limit position b and the upper limit position a of the abutment 5 (FIG. 3) are both based on the mounting position of the link mechanism B.

[0007]

Conventionally, as described above, the movement stroke e of the Z-axis drive block 15 is:
The lower limit position b and the upper limit position a of the abutment 5 in the formula (1) are both based on the mounting position of the link mechanism B.

That is, the lower limit position b and the upper limit position a of the abutment 5
Is a vertical position with the origin of the mounting position of the link mechanism B (FIG. 3).

However, as described above, the lower limit position b and the upper limit position a of the abutment 5 having the origin at the mounting position of the link mechanism B are:
Due to the mounting error of the link mechanism B and the like, unlike the actual dimensions, the following adverse effects may occur.

For example, when the stroke e is calculated by the equation (1), assuming that the mounting position of the link mechanism B is the origin within the NC and b1 = 27 (FIG. 3), depending on the mounting position of the link mechanism B, , ± 1 mm.

Therefore, at the time of adjustment after assembling, the upper surface (FIG. 3) of the lower table 2 is set as the origin, and the abutment 5 is moved from a position of 180 mm to a position of 50 mm.
Even if the movement stroke e of the Z-axis drive block 15 is calculated by the equation (1), and the rotation command value is given to the Z-axis motor Mz based on the calculated value, the abutment 5 can be adjusted to the target value 50 mm.
Cannot be reached.

That is, as described above, in the NC, b
Assuming that 1 = 27 (FIG. 3), the moving stroke e of the Z-axis drive block 15 when the butting 5 is moved from the position of 180 mm to the position of 50 mm is given by the following equation (1): e = √ ｛230 ² − ( 27 + 50) ² {− {230 ² − (27 + 180) ² } = 116.47

However, in actuality, b1 = 28. When d is obtained from b1 = 28 (FIG. 3), d = {230 ² − (28 + 180) ² } = 98.16. 98.16 and e = 11 calculated earlier
From 6.47, f which is the sum of d and e is f = d + e = 98.16 + 1116.47 = 214.63

Thus, when b2 (FIG. 3) is obtained, b2 = {(230 ² −f ² ) −b1 = {230 ² − (214.63) ² } −28 = 54.67

That is, with respect to the target value 50 mm of the abutment 5,
54.7 mm, so that the abutment 5 cannot reach the target value, and the positioning accuracy of the abutment 5 is significantly reduced. .

The problem is that the abutment 5 has an upper limit position a with the mounting position of the link mechanism B as the origin corresponding to a position 180 mm (FIG. 3) with the upper surface of the lower table 2 as the origin.
If can be measured, it will be solved.

However, in reality, the upper limit position a having the origin at the mounting position of the link mechanism B cannot be directly measured due to space limitations.

An object of the present invention is to measure a vertical reference position of an abutment having an origin at a mounting position of a link mechanism in a back gauge device using a link mechanism.
An object of the present invention is to improve the positioning accuracy of the abutment by accurately obtaining a rotation command value to be given to the Z-axis motor when the abutment is moved in a vertical direction.

[0019]

According to the present invention, a Z-axis drive block 15 is moved in the front-rear direction by a Z-axis motor Mz, and abutment 5 supported by a link mechanism B is moved up and down. (1) The first reference position 50 m in the vertical direction of the butting 5 with the lower table 2 as the origin.
m, (2) selecting the second reference position 180 mm in the vertical direction of the butting 5 with the lower table 2 as the origin, and (3) the first reference selected in the above step (1). From the position 50 mm to the second reference position 180 mm selected in the step (2), the bump 5
And (4) determining the vertical movement stroke c of the abutment 5 and the forward / backward movement stroke e of the Z-axis drive block 15 at that time. Based on the vertical movement stroke c of the abutment 5 and the forward / backward movement stroke e of the Z-axis drive block 15, a first reference position b of the abutment 5 in the vertical direction with the mounting position of the link mechanism B as the origin. And the second
A method of measuring a reference position for abutment, which comprises a step of obtaining a reference position a, and a first reference position of 50 mm and a second reference position of 180 mm in a vertical direction of abutment 5 with the lower table 2 as an origin. A moving stroke calculating means for calculating a vertical moving stroke c of the abutment 5 and a front and rear moving stroke e of the Z-axis drive block 15; The first in the up-down direction of the butting 5 with the mounting position of B as the origin
The present invention employs a technical means called an abrupt reference position measuring device, characterized by having a reference position calculating means for calculating the reference position b and the second reference position a.

Therefore, according to the structure of the present invention, the first reference position 50 mm and the second reference position 180 mm in the vertical direction of the butting 5 with the lower table 2 as the origin are set in advance, so that the link mechanism B It is possible to measure the first reference position b and the second reference position a in the vertical direction of the abutting with the attachment position of the origin as the origin.

For this reason, in the conversion formula represented by the formula (1), the moving stroke e in the front-rear direction of the Z-axis drive block 15 necessary for moving the butting 5 in the vertical direction can be accurately obtained, and as a result, The rotation command value given to the Z-axis motor Mz can be accurately obtained, and the positioning accuracy of the abutment 5 can be improved.

[0022]

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 includes 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 flange size of a work W (FIG. 5C), and a procedure of a measuring method according to the present invention (FIG. 2). .

Among the above-mentioned processing conditions, before the processing of the work W, the first up-down direction of the butting 5 with the link mechanism B as the origin.
The conditions for measuring the reference position b and the second reference position a (FIG. 3) (step 104 in FIG. 2) are also included.

For example, the measurement conditions are as follows: the first reference position 50 m in the vertical direction of the butting 5 with the lower table 2 as the origin.
m and a second reference position 180 mm (FIG. 3).

The control unit 51 is, for example, a CPU. Based on the input signal S1 from the input unit 50, the control unit 51 uses the method according to the present invention to set the position of the link mechanism B as the origin in the vertical direction of the abutment 5. The first reference position b and the second reference position a are calculated, and the Z-axis drive block 1 is calculated by the equation (1).
5 is calculated, a rotation command value to be given to the Z-axis motor Mz is calculated in accordance with the movement stroke e, and a control signal S3 corresponding to the rotation command value is sent to the next NC53. Send to

That is, the control unit 51 calculates the first reference position b and the second reference position a in the vertical direction of the abutment 5 with the mounting position of the link mechanism B as the origin, thereby moving the abutment 5 in the up-down direction. , The rotation command value given to the Z-axis motor Mz is accurately calculated, and the calculated rotation command value is used to calculate N
The back gauge device (FIG. 4), which is the processing unit 54, is controlled via the C53, and the butting 5 is moved in the vertical direction.

In addition, the control unit 51 controls the movement of the abutment 5 in the longitudinal direction (X-axis direction) and the front-back direction (Y-axis direction), and further controls the entire apparatus shown in FIG.

The storage unit 52 temporarily stores the processing conditions and the program input from the input unit 50.

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

The processing section 54 is, specifically, a back gauge device using a link mechanism B 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, and 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 X-axis direction, and an upper table 1 is provided directly above the lower table 2.
The work W (FIG. 5) is formed by cooperation of a punch (not shown) mounted on the lower table 2 and a die (not shown) mounted on the lower table 2.
(C)) is to be bent.

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

The stretch D connects the Z-axis drive mechanisms C at both ends, and the Z-axis drive mechanism C is connected to the Y-axis through a link mechanism B.
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 Y-axis drive mechanism A includes support members 18 and 6
Y-axis motor My fixed to lower table 2 through
A ball screw 8 coupled to the Y-axis motor My;
A Y-axis drive block 10 that is screwed into the ball screw 8 and moves along the Y-axis rail 7, and a Y-axis driven block 9 that moves along the Y-axis rail 7 according to the movement of the Y-axis drive block 10. ing.

Therefore, by controlling the NC 53 (control signal S4 in FIG. 1), the Y-axis motor My is driven to move the link mechanism B in the Y-axis direction as shown in FIG. Y1) The entire stretch D is moved in the Y-axis direction, whereby the abutment 5 can also be moved in the Y-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, and a Z screw 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 the Y-axis Axis driven block 9 and Y-axis drive block 10
Are moved toward and away from each other (arrow Y2), and the entire stretch D is moved in the Z-axis direction by expanding and contracting the link mechanism B (arrow Z1), whereby the abutment 5 can also be moved in the Z-axis direction. .

Further, as described above, the link mechanism B is
The lower end is provided with hinges 9A and 10A for the Y-axis drive mechanism A.
Is attached to the lower table 2. However, due to the mounting error of the link mechanism B, the lower limit position b and the upper limit position a of the abutment 5 having the origin at the mounting position of the link mechanism B (FIG. 3) are different from the actual dimensions, and are directly measured. Can not.

Therefore, the lower table 2 is formed by the following method.
First reference position 5 in the up-down direction of the abutment 5 having the upper surface as the origin
By setting 0 mm and the second reference position 180 mm in advance, the first reference position b and the second reference position a in the up-and-down direction with the origin at the attachment position of the link mechanism B are measured.

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

(1) Abutting 5 with origin at lower table 2
The first reference position in the vertical direction is selected. First, in step 101 of FIG. 2, the upper surface of the lower table 2 (FIG. 3)
, And a first reference position from this origin to the lower surface of the abutment 5 is selected.

In this case, the first reference position is, for example, a position below the abutment 5 in the vertical direction, and
Select 0 mm. This selected lower limit position 50mm
Are input from the input unit 50 and stored in the storage unit 52 (FIG. 1).

(2) Abutment 5 with origin at lower table 2
Is selected in the vertical direction. Next, in step 102, as in step 101, the upper surface (FIG. 3) of the lower table 2 is set as the origin, and a second reference position from this origin to the lower surface of the abutment 5 is selected.

In this case, the second reference position is, for example, a position above the abutment 5 in the up-down direction, and the upper limit position 1
Select 80mm. This selected upper limit position 180m
m is input from the input unit 50 and stored in the storage unit 52 (FIG. 1).

(3) A vertical moving stroke c of the abutment 5 and a longitudinal moving stroke e of the Z-axis drive block 15 are obtained.

Next, in step 103, the first reference position 5 selected in steps 101 and 102 is set.
The vertical movement stroke c of the abutment 5 when the abutment 5 is moved from 0 mm to the second reference position 180 mm.
Then, the movement stroke e of the Z-axis drive block 15 in the front-rear direction at that time is obtained (FIG. 3).

That is, in FIG. 3, the vertical movement stroke c of the butting 5 is clearly c = 180 mm−50.
mm = 130 mm. In addition, in order to move the butting 5 in the vertical direction, the Z-axis motor Mz is driven,
It is necessary to move the Z-axis drive block 15 in the front-back direction. Therefore, when the abutment 5 is moved from the selected first reference position 50 mm to the second reference position 180 mm,
The movement stroke e of the Z-axis drive block 15 is actually measured.
And, the vertical movement stroke c of this abutment 5;
Movement stroke e of the Z-axis drive block 15 in the front-rear direction
Are stored in the storage unit 52 via the input unit 50 (FIG. 1).

(4) Finally, in step 104,
Based on the movement strokes c and e obtained in step 103, a second reference position a in the up-down direction of the abutment 5 with the mounting position of the link mechanism B as the origin is obtained.

That is, the control unit 51 (FIG. 1)
2, a vertical movement stroke c of the abutment 5 and a front-back movement stroke e of the Z-axis drive block 15 are input.

Then, a first reference position b and a second reference position a in the up-down direction of the butting 5 with the origin at the mounting position of the link mechanism B are calculated by the following processing. In this case, if the second reference position a is determined, the first reference position b is determined from b = ac, so that the second reference position a is determined first.

That is, in FIG. 3, assuming that the length of the links 3 and 4 is 230 mm, b ² + f ² = 230 ² (2) a ² + d ² = 230 ² (3)

As is clear from FIG. 3, f = d + e (4) b = ac (5) When (5) is substituted into (2), there is a relationship of (3), so that c ² + e ² +2 (d × e−a × c) = 0 (6)

When (6) is solved for a, a = (c ² + e ² ) / 2c + d × e / c (7) In (7), c (movement stroke of the abutment 5) and e
Since (the stroke of the Z-axis drive block 15) is known, a can be obtained if d is known.

Then, by substituting (7) into (3) and rearranging, {(c ² + e ² ) / c ² ｝ d ² + ｛(c ² + e ² ) × d / c ² ｝ d + ｛( c ² + e ² ) / 2c｝ ² −230 ² = 0 (8), and a quadratic equation of d is obtained.

Now, in (8), (c ² + e ² ) / c
² = P, (c ² + e ² ) × d / c ² = Q, ｛(c ² + e
²⁾ / 2c} If you put a ² -230 ² = R, a ^{P × d 2 + Q × d} + R = 0 ······ (9).

Therefore, if (9) is solved for d, as is well known, d = {− Q + {(Q ² −4 × P × R)} / 2 × P (10) By substituting (10) into (7), a = (c ² + e ² ) / 2c + e / c × {−Q + {(Q ² −4 × P × R)} / 2 × P. (11) The second reference position a in the up-down direction of the butting 5 with the origin at the mounting position of the link mechanism B is calculated. Also, b = a
From -c, abutment 5 with the attachment position of link mechanism B as the origin
Can be calculated in the vertical direction.

Accordingly, the control unit 51 (FIG. 1) substitutes the first reference position b and the second reference position a calculated in this way into the equation (1) to move the abutment 5 up and down. The movement stroke e of the Z-axis drive block 15 in the front-rear direction required for moving in the Z direction can be accurately calculated.
The rotation command value given to the shaft motor Mz is accurately calculated, and NC
The movement of the butting 5 can be controlled via the 53, and the positioning accuracy of the butting 5 can be improved.

In the above-described embodiment, the second reference position a in the vertical direction of the abutment 5 having the origin at the mounting position of the link mechanism B is determined first. However, the present invention is not limited to this, and the first reference position b in the up-down direction of the butting 5 with the origin at the mounting position of the link mechanism B is first obtained by solving the same equation as (7). Of course, the same effect can be obtained.

[0063]

As described above, according to the present invention, a method and a device for measuring a reference position of a collision are described by using the first reference position and the second reference position in the vertical direction of the collision with the lower table as the origin. By setting in advance, the first reference position and the second reference position in the vertical direction of the abutment with the attachment position of the link mechanism as the origin are determined, so that the back gauge device using the link mechanism can The technical effect of improving the positioning accuracy of the abutment by accurately obtaining a rotation command value given to the Z-axis motor when the abutment is moved in the up-down direction is achieved.

[0064]

[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 operation explanatory view of 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.

[Explanation of symbols]

Reference Signs List 50 Input unit 51 Control unit 52 Storage unit 53 NC 54 Processing unit A Y-axis drive mechanism B Link mechanism C Z-axis drive mechanism D Stretch 1 Upper table 2 Lower table 3, 4 Link 5 Butt 6, 12, 18 Support member 7 Y-axis rail 8, 14 Ball screw 9 Y-axis driven block 10 Y-axis drive block 13 Z-axis rail 15 Z-axis drive block 16 Z-axis fixed block My Y-axis motor Mz Z-axis motor a The upper limit position of the abutment 5 in the vertical direction b The lower limit position of the abutment 5 in the vertical direction with the mounting position of the link mechanism B as the origin c The vertical movement stroke of the abutment 5 e The longitudinal direction of the Z-axis drive block 15 Moving stroke

Claims (3)

[Claims] 1. A back gauge device using a link mechanism in which a Z-axis drive block is moved in a front-rear direction by a Z-axis motor, and an abutment supported by the link mechanism is moved in a vertical direction. Selecting a first reference position in the vertical direction of the abutment with the lower table as the origin;
(2) The second in the vertical direction of the abutting with the lower table as the origin
(3) selecting a reference position; and (3) determining the abutment when moving the abutment from the first reference position selected in the step (1) to the second reference position selected in the step (2). A step of obtaining a vertical movement stroke and a forward and backward movement stroke of the Z-axis drive block at that time; (4) a vertical movement stroke of the abutment determined in the above step (3); A step of obtaining a first reference position and a second reference position in the vertical direction of the abutting with the mounting position of the link mechanism as an origin, based on the forward and backward movement strokes of the block. Reference position measurement method. 2. The reference position measurement according to claim 1, wherein the first reference position selected in the step (1) is 50 mm, and the second reference position selected in the step (2) is 180 mm. Method. 3. A first vertical position and a second reference position of an abutment with the lower table as an origin, and a vertical movement stroke of the abutment and a forward / backward movement stroke of the Z-axis drive block. And a reference position calculating means for inputting the calculated movement stroke and calculating a first reference position and a second reference position in the vertical direction of the abutment with the mounting position of the link mechanism as the origin. A striking reference position measuring device characterized by having: