JPS62152645A - Machine tool coordinate correction device - Google Patents

Abstract

PURPOSE:To reduce mounting time and improve working efficiency, by calculating workpiece coordinate system dimensions at a machining point and correcting them to machine coordinate system dimensions automatically through determination of a coordinate rotation angle and a coordinate value of a coordinate rotation center of a workpiece mounted by a sensor. CONSTITUTION:A coordinate rotation angle theta and a coordinate value of a coordinate rotation center sensed by sensing means 101 are stored in memory means 102 and the coordinate rotation angle theta and the coordinate value of the coordinate rotation center stored in the memory means 102 are applied to correction means 103. In addition, the correction means 103 is provided with machining program data stored in machining program memory means 105, a selection signal selected by selection means 104 and position data sensed by position sensing means 107. Then, the correction means 103 corrects operation of a machine tool by use of the coordinate rotation angle theta and the coordinate value of the coordinate rotation center and a servomotor 109 is corrected based on the correction data through a table actuator 110 and a servo amplifier 108, whereby a prescribed machining is automatically effected and mounting time is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention detects and stores the mounting state of the square workpiece on the table when machining a square workpiece appropriately mounted on a table with a machine tool. The present invention relates to a coordinate correction device for a machine tool that automatically generates a movement for correcting the mounting condition each time a program is reproduced.

[Conventional technology]

Conventionally, when a square workpiece is subjected to a predetermined processing using a machine tool, the square workpiece is first mounted on a table.

When installing a square workpiece on a table, the operator
In order to accurately mount a square workpiece on a table, centering was performed using a jig or a special program was used.

[Problem that the invention seeks to solve]

However, since the above-mentioned various workpiece attachment means are used to attach the workpieces accurately, the workpiece attachment operation requires a great deal of time and effort, and there is a problem in that quick processing is not possible.

The purpose of the present invention was proposed in order to solve the problems in view of the above-mentioned circumstances.The purpose of the present invention is to detect and store the state in which a square workpiece is placed on a table, and to create a machining program. An object of the present invention is to provide a coordinate correction device for a machine tool that automatically corrects and corrects the mounting state when regenerating the machine tool.

[Means and effects for solving the problem] The present invention detects the state in which the square workpiece is placed on the table, detects and stores the mounting state, and further automatically performs correction processing. A coordinate correction device for a machine tool that performs correction,
The specific means includes an input/output means for inputting and outputting various preset parameters, a position detecting means for detecting each position, and a processing reference plane in which the position detecting means is orthogonal to the processing reference plane. contact detection means for detecting contact with the machining surface; selection means for selecting a detection operation in which the machine tool detects an angle or a regeneration operation in which the machining program is regenerated; A coordinate rotation angle/coordinate rotation center detection means for detecting the position of a point and one point on a machined surface and performing calculation processing based on the detected position data to obtain a coordinate rotation angle and a coordinate rotation center coordinate value; Rotation angle/coordinate A coordinate rotation angle/coordinate that stores the coordinate rotation angle detected by the rotation center detection means and the coordinate value of the coordinate rotation center.
A coordinate rotation center memory, a machining program memory that stores machining program data, and a machining program memory that stores machining program data.
Machining program data stored in memory, coordinate rotation angle, coordinate rotation center, and coordinate rotation angle stored in memory.

It consists of a correction means for correcting the operation of the machine tool by calculating the correction amount for correcting the workpiece coordinate value of the machining point to the machine coordinate value from the coordinate rotation center coordinate value, and a position feed control means for moving the table etc. Ru.

By employing the apparatus of the present invention, corrections can be made automatically regardless of the state in which the square workpiece is placed on the table, so that rapid processing becomes possible.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

(1) First, the basic principle of the present invention will be explained.

Figure 2 (a) is a model explaining the basic principle of the present invention.

This is a diagram. In FIG. 2(A), it is assumed that a square workpiece W is mounted on a table Ta of a machine tool at an arbitrary angle, that is, a rotation angle θ.

One vertex of this month's first workpiece W and the machining program origin dp
Assuming that they match, the machining reference plane Wa of the workpiece W is
The machining surface w is the axis and is orthogonal to the machining reference surface Wa of the workpiece W.
Let b be the Y axis. The machine origin is d4, and the Q of the machine coordinate system is
, I The X-ray is the X-axis, and the c59-Y line is the Y-axis.

The coordinate values of the machining program origin OP are set to the machine origin 0. of the machine coordinate system. Letting Φx and oy respectively from (0, O), the coordinate values (x, y) of the workpiece coordinate system of the machining point P on the workpiece W to be machined are the coordinate values (X, Y) of the machine coordinate system.
Expressed as , it can be found by .

Solve the above equation (and ') (=xcosθ+y sinθ+ΦXY−-xsi
nθ+y cosθ+c5y.

Therefore, conversion is possible if the coordinate values (Ox, Oy) and angle θ of the machine coordinate system are found from the machining program origin Φp of the workpiece coordinate system.

Next, the coordinate value (p
The procedure for measuring and calculating the angle θ (x, Oy”) will be explained.

The probes of the measurement touch sensor are applied to the machining reference surface Wa in FIG.
The coordinate values of l + P z and P3 are respectively P + (X
In 3+ +) + h(Xz, yz) and P 3(
X 3. )' 3) is the actual measurement value, then point P
+(X l, y+) and point P2(Xz,)'z), the straight line m of the machining reference plane Wa is y=a x+b...
...(Suppose it is 11.

Let n be the straight line on the machined surface wb that passes through point P3 (X3.Vt) and the origin of the cutting nib probe OP, and since the straight line n is perpendicular to the straight line m, y=--x0c... (2) Become.

Equation (1) of straight line m is point P + (X+, )'+) + point P z
Since it passes through (X z, '/z), x, -X.

Furthermore, since the point P+(X+,)'+) is on the equation (1) of the straight line m, b=y, -ax.

Since the point P*(Xz,)'z) is on the equation (2) of direct vAn, the above equations (11 and (2+) are respectively y-a x+
(y+ a X+)...=fll'.

X! 7X.

The intersection Op (OX,
O'/) is obtained as Oy=(b +31°)/(1+a・)=(y+-ax
+ +3□ys-axs)/(1+a")".

Therefore, the coordinate values Φx and oy of the workpiece coordinate system of the machining program origin Φp are the above ■, and the coordinate rotation angle θ is Xg -X.

That will happen.

The coordinate values (x, y) of the workpiece coordinate system of the machining point P are corrected to the coordinate values (X, Y) of the machine coordinate system by incorporating the values of QX and Φy according to the above (2) into the equation (2). Therefore, as shown in Figure 2 (c) (xI+ of the machining program) 'I
; XZ+ )'2 ; X, l, y3 are modified and converted into X+, Yl;

When measuring by applying the probe of the measurement touch sensor to the processing reference surface Wa and the processing surface wb perpendicular to the processing reference surface Wa, the actual corner position is located between the center of the touch probe Tp and the processing surface wb perpendicular to the processing reference surface Wa, as shown in FIG. Since they do not match, it is actually necessary to correct the radius of the touch probe Tp by one minute.

(2) Next, the configuration of the present invention will be explained using the functional block diagram shown in FIG.

In FIG. 3, preset values are input from the key manual means 100 to the detection means 101 that detects the coordinate rotation angle θ and the coordinate rotation center, that is, the coordinate values of the machining program origin OP of the workpiece coordinate system, and the detection operation and The selection is made using the playback operation selection means 104.

Further, the contact detection means 106 makes contact with the points PI, P2, and P3 to be measured, and the position data is detected and taken into the detection means 101 by the position detection means 107.

The coordinate rotation angle θ detected by the detection means 101 and the coordinate value of the coordinate rotation center are stored in the storage means 102, and the storage means 1
The coordinate rotation angle θ and the coordinate value of the coordinate rotation center stored in 02 are taken into the correction means 103. Furthermore, the correction means 1
03, the machining program data stored in the machining program storage means 105, the selection signal selected by the selection means 104, and the position data detected by the position detection means 107 are taken in.

The correction means 103 corrects the operation of the machine tool based on the coordinate rotation angle θ and the coordinate value of the coordinate rotation center, and corrects the servo motor 109 via the table actuator 110 and servo amplifier 108 based on the correction processing data. Then, the predetermined processing is automatically performed.

(3) The specific configuration of the present invention will be explained.

FIG. 1 is a control block diagram showing the configuration of the present invention.

In FIG. 1, various preset data are input to the CPUI from a keyboard with screen 2 via an input/output circuit 2a.

For example, among the parameters, PRMO4 is the probe sphere diameter of the touch sensor, PRMO5 is the eccentricity in the X direction from the center of the main axis to the center of the probe sphere, PRMO6 is the eccentricity in the Y direction from the center of the main axis to the center of the probe sphere, and the return when touching again. The quantity PRMO8 etc. are input from the screen keyboard 2 and stored in the parameter memory 3.

The selection switch 4 for detection memory work and playback work is CFull.
The machining program data is stored in the machining program memory 5.

The table and the like are controlled to move in the X- and Y-axis directions by a motor 6C in the X- and Y-axis directions via an input/output device 6a and a servo amplifier 6. Feedback is provided from the motor 6C via the PC 6d.

The touch sensor 7a is connected to the CPUI via an amplifier 7b and an input/output device 7.

The number of measurements N is counted by the counter 8 by the addition command signal, and the number N of measurements by the counter 8 is reset by the reset signal.

When the probe of the touch sensor 7a comes into contact with the processing reference surface Wa and the processing surface wb, the current position data of the touch sensor is taken into the current position register 9 of the touch sensor. When the probe of the touch sensor first contacts the point p, (x+, yt) on the processing reference surface Wa, the coordinate value of the point PI is taken into the current position register 9 of the touch sensor and the counter 10 is set to N=1. The value of X++)'+ is stored in the memory 11. Second point P zc on the processing reference plane Wa
x2. )' z) When the probe of the touch sensor comes into contact with point P2, the coordinate value of point P2 is taken into the current position register 9 of the touch sensor and stored in the memory 12 with the counter 10 set to N=2. The values of xI+YI;

“I+yt:xl” taken into the calculation unit 13
The coordinate rotation angle Xt -X is calculated by the value of yt. The coordinate rotation angle θ calculated by the calculation unit 13 is taken into the coordinate rotation angle/coordinate rotation center/memory 15 and stored.

Thirdly, when the probe of the touch sensor contacts the point P+OC+,)'3) on the processing surface wb, the coordinate value of the point P is taken into the current position register 9 of the touch sensor, and the counter lO is set to N=3 and the arithmetic unit 14. Since the calculation unit 14 has already taken in the value of X I+ 3'I;"try2 stored in the memory 11 and the memory 12, 3 a
Oy; (yt ax, +a2yz a, xi)/
(1+a”) ox, oy are coordinate rotation angle/coordinate rotation,
. . . Captured and stored in the memory 15.

Coordinate rotation angle, coordinate rotation center, coordinate rotation angle θ stored in the memory 15, and coordinate value QX of the coordinate rotation center.

oy and the machining program data stored in the machining program memory 5 are respectively taken into the machining program converter 16 and subjected to arithmetic processing, so that the coordinates of the workpiece coordinate system of the machining point P (; (x, y) are Conversion processing is performed to coordinate values (X, Y) of the coordinate system.

The motor 6C of the position feed control means is driven and controlled by the coordinate values (X, Y) of the machine coordinate system converted by the machining program converter 16, and automatic correction is performed.

(4) The operation of the present invention will be explained based on the flowchart of FIG.

When the device of the present invention is operated to cause the device to drift, it is determined in the 0th stage whether or not to detect by the detection work selection means, and if it is determined that the detection work is not selected, the system is returned to the initial state and feedbanked to the starting point.

If it is determined at the 0th stage that a detection work selection is to be performed, the process proceeds to the 0th stage and it is determined whether or not to bring the probe of the touch sensor into contact with each processing surface. If it is determined that the probe of the touch sensor is not to be brought into contact with each processing surface at the 0th stage, the initial state is returned and then the feed path to the starting point is performed.

When it is determined that the probe of the touch sensor is to be brought into contact with each processing surface at the 0th stage, the process proceeds to the 0th stage and the current position (x, y) of the evening/time sensor is read.

First, if the counter lO is N=1 at the 0th stage, the process advances to the 0th stage, reads the workpiece coordinate values (x+, y+) of the point P, stores them in the memory 11, and returns to the starting point.

If the counter 10 is not N=1 at the 0th stage, proceed to the 0th stage, and if the counter 10 is N==2 at the 0th stage, the work coordinate value (xz, yz) of the point P2 is calculated at the 0th stage. Read and store in memory 12. Furthermore, in the 0th stage, it is determined whether or not only the angle of the coordinate rotation angle θ is calculated. If it is determined not to be calculated, it is fed back to the starting point, and if it is determined to be calculated, the calculation unit After arithmetic processing is performed, the coordinate rotation angle, the coordinate rotation center, and the coordinate rotation center are stored in the memory 15 and then fed back to the starting point.

If the counter 10 is not N=2 at the 0th stage, the process proceeds to the [phase] stage and it is determined whether the counter 10 is N=3. N
When it is determined that =3, the workpiece coordinate value (X3.ys) of point P3 is taken into the calculation unit 14 at the 0th stage, and the coordinate values QX, Φy of the center of coordinate rotation are determined. The obtained coordinate values Φx, oy are the coordinate rotation angle, coordinate rotation center, and memory 1.
5 is stored.

If it is determined in the [phase] stage that N=3 is not present, an exception handling handler is executed.

The coordinate rotation angle, the coordinate rotation center, and the coordinate rotation angle θ obtained in the 2nd and 0th stages and stored in the memory 15.

The coordinate values ox, oy of the coordinate rotation center and the machining program data stored in the machining program memory 5 are taken into the machining program converter 16, and the coordinate values x, y of the workpiece coordinate system of the machining point P are converted into the machine coordinate system. A conversion correction process to the coordinate values X and Y is performed. Next, the motor 6C of the position feed control means is driven and controlled to perform automatic correction.

〔effect〕

In order to detect the state in which a workpiece (for example, a goniometric object workpiece) is placed on a table, the present invention provides touch sensors on each of the machining reference surface of the workpiece on the table and the machining surface perpendicular to the machining reference surface. The dimensions of the workpiece coordinate system at the machining point are converted into the dimensions of the machine coordinate system by applying the probe to the machine coordinate axis and determining the angle formed by the machine coordinate axis, that is, the coordinate rotation angle, and the intersection point between the machining reference plane and the orthogonal machining surface, that is, the coordinate rotation center coordinate value. Automatic calculations and automatic corrections reduce setup time when attaching workpieces, allowing for faster processing. In turn, this has the effect of improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a control block diagram showing the configuration of the present invention. Figure 2 (A) is a model diagram explaining the basic principle of the present invention, Figure 2 (II+) is a model diagram for determining the coordinate rotation angle and coordinate rotation center coordinate value, and Figure 2 (C) is a model diagram for calculating the coordinate rotation angle and coordinate rotation center coordinate value. The model diagram of the machining program corrected to the machine coordinate system and Figure 2 (D) take into account the touch sensor probe radius that measures the actual measurement value by bringing the touch sensor probe into contact with the machining reference surface and the machining surface. It is a model diagram for explanation. FIG. 3 is a functional block diagram functionally explaining the configuration of the present invention. FIG. 4 is a flowchart illustrating the present invention in detail. ■・・・CPU 2・・・Keyboard with screen 5・・・Machining program memory 6C・
...Motor 7a...Touch sensor 9...
- Touch sensor current position register 10... Counter 11, 12... Memory 16... Machining program converter Wa... Machining reference plane wb.
...Machining surface ON...Machine origin op...Machining program origin. Patent applicant Hitachi Seiki Co., Ltd. Figure 2 (A) Figure 2 (0) Figure 3 Figure 4 FIJ

Claims (1)

[Claims] An input/output means for inputting and outputting various preset parameters, a position detecting means for detecting each position, and a position detecting means for detecting when the position detecting means has contacted a machining reference surface and a machining surface orthogonal to the machining reference surface. A contact detection means for detecting, a selection means for selecting a detection operation in which the machine tool detects an angle or a regeneration operation in which the machining program is reproduced, and the position detection means detects two points on the machining reference surface and one point on the machining surface. a coordinate rotation angle/coordinate rotation center detection means for detecting the position of and calculating a coordinate rotation angle and a coordinate rotation center coordinate value based on the detected position data, and detecting the coordinate rotation angle/coordinate rotation center. A coordinate rotation angle/coordinate rotation center/memory that stores the coordinate rotation angle detected by the means and coordinate values of the coordinate rotation center, and a machining program/memory that stores machining program data.
The memory, the machining program, the machining program data stored in the memory, the coordinate rotation angle, coordinate rotation center,
A correction means for correcting the operation of the machine tool by calculating the correction amount for correcting the workpiece coordinate value of the machining point to the machine coordinate value from the coordinate rotation angle and coordinate rotation center coordinate value stored in the memory, and moving the table, etc. A coordinate correction device for a machine tool, comprising a position feed control means for adjusting the coordinates of a machine tool.