JPH0519824A - Numerical controller and work attitude detection device - Google Patents

Abstract

PURPOSE:To eliminate the need to strictly adjust the attitude of a work mounted on the table of a machine tool. CONSTITUTION:A horizontal inclination correcting means 13a which corrects the horizontal inclination of the work mounted on the table of the machine tool and a vertical inclination correcting means 13b which corrects the vertical inclination of the work are provided. Movement quantity data of an X axis, a Y axis, and a Z axis which are calculated by a movement quantity calculating means 11 are corrected by the horizontal inclination correcting means 13a and vertical inclination correcting means 13b. A axis control means 14 corrects a servomotor for the X axis, Y, axis, and Z axis according to the corrected movement quantity data. Consequently, the need to strictly adjust the attitude of the work mounted on the table of the machine tool is eliminated. Further, the work can be machined with high precision by a machining program which does not consider the inclination of the work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device and a work posture detecting device, and more specifically, to the control axes by correcting horizontal and vertical inclinations of a work placed on a table of a machine tool. The present invention relates to a numerical control device for driving a workpiece and a work posture detecting device for detecting the posture of a work placed on a table of a machine tool and displaying it graphically.

[0002]

2. Description of the Related Art FIG. 10 is a hardware configuration diagram of an example of a conventional numerically controlled electric discharge machine (hereinafter referred to as NC electric discharge machine). A numerical control device (hereinafter referred to as NC device) (60) provided in a conventional NC electric discharge machine includes a central processing unit (hereinafter referred to as CPU) (60a) and a memory for storing a machining program, machining status data, and the like. (60
b), an axis control device (60c) for controlling the operation of each control axis (X axis, Y axis, Z axis), and a keyboard (60 having a data input / correction key and a menu selection / screen switching key).
d), a display device (60e) for displaying various information such as a machining path and electrode coordinates, a CPU (60a), a memory (6)
0b), axis control device (60c), keyboard (60d)
And a bus (60) for connecting the display device (60e) to each other.
f) and.

The CPU (60a) sends a control signal to the axis control device (60c) according to a machining program.
The axis control device (60c) receives the control signal and sends the control signal to the servo motor (71) that drives each control axis. The servo motor (71) for each control axis operates according to the control signal, moves the table (72) in the X-axis and Y-axis directions, and moves the electrode (73) in the Z-axis direction. The positions of the table (72) and the electrode (73) are detected by the position detector (74) and fed back to the axis controller (60c).

The X-axis, Y-axis and Z-axis form an orthogonal coordinate system, the X-axis and the Y-axis are set in the horizontal direction, and the table (72) is moved in the horizontal direction. The Z axis is set in the vertical direction and moves the electrode (73) in the vertical direction.

FIG. 11 is a functional block diagram of the conventional NC electric discharge machine. The NC device (60) includes a movement amount calculation means (61), an inclination angle input means (62), an inclination correction means (63), an axis control means (64), a movement amount detection means (65). Coordinate value calculation means (66), display means (67), and movement command input means (68) are provided.

The movement amount calculation means (61) is based on the movement command read from the machining program P or the movement command input from the movement command input means (68), and the X-axis and Y-axis.
The amount of movement of the axes and the Z-axis is calculated, and the obtained amount of movement data is sent to the inclination correction means (63) and the coordinate value calculation means (66). This movement amount data is calculated and sent by the CPU.
(60a) is performed according to the control program stored in the memory (60b).

The inclination angle input means (62) inputs the inclination angle data of the work placed on the table (72) to the inclination correction means (63). Here, in the "workpiece inclination angle", the predetermined reference plane of the work is the XY plane (horizontal plane).
It means the angle formed with respect to the X-axis or the Y-axis. As will be described later, this tilt angle data is obtained by the operator measuring the position of the reference plane using a dial type measuring instrument, calculating the tilt angle from the obtained position data, and using the keyboard (60
Input from d). The input tilt angle data is stored in the memory (60b) and read when the CPU (60a) performs tilt correction according to the control program.

The inclination correcting means (63) is provided with a table (7
2) The movement amount data of the X axis and the Y axis are corrected according to the inclination of the workpiece placed on the XY plane, and the corrected X axis,
The Y-axis movement amount data and the uncorrected Z-axis movement amount data are sent to the axis control means (64). The movement amount data is corrected by rotating a preset X-Y-Z coordinate system around the origin in the X-Y plane by the inclination angle of the work. This correction is performed by the CPU (60a) according to the control program.

The axis control means (64) is a tilt correction means (6).
Based on the X-axis, Y-axis, and Z-axis movement amount data sent from 3), control signals are sent to the servo motors (71) that drive the X-axis, Y-axis, and Z-axis, respectively. The servo motor (71) for each axis operates according to the control signal to move the table (72) and the electrode (73). The axis control means (64) is composed of an axis control device (60c).

The movement amount detecting means (65) is provided with a table (7
2) and the movement amount of the electrode (73) are detected, and the detected movement amount data is fed back to the axis control means (64). Further, the movement amount data is used as coordinate value calculation means (66).
Send to. The movement amount detecting means (65) is composed of a position detector (74), and specifically, an encoder, a resolver and the like.

The coordinate value calculating means (66) at each time is based on the X-axis, Y-axis, and Z-axis movement amount data (indicating the actual movement amount) sent from the movement amount detecting means (65). The coordinate values of the X axis, Y axis, and Z axis are calculated. The X-axis, Y-axis, and Z-axis coordinate value data obtained by this calculation is after the work inclination correction. The coordinate value calculation means (66) also calculates the X at each time based on the X-axis, Y-axis, and Z-axis movement amount data (indicating the movement amount of the control signal) sent from the movement amount calculation means (61). The coordinate values of the axes, Y-axis and Z-axis are calculated. X axis, Y obtained by this calculation
The coordinate value data of the axes and Z-axis is before the work inclination correction. Therefore, the coordinate value calculation means (66) can obtain both the coordinate value data before the correction process and the coordinate value data after the correction process. The coordinate value data of each axis thus obtained is sent to the display means (67). In addition,
The CPU (60a) performs the calculation and transmission of the coordinate value data according to the control program.

The display means (67) is a coordinate value calculation means (6
Based on the X-axis, Y-axis, and Z-axis coordinate value data sent from 6), the coordinate values of each axis before or after the work inclination correction process are displayed. The display means (67) is composed of a display device (60e) such as a CRT.

The movement command input means (68) is used when the operator manually inputs a movement command. The input movement command is sent to the movement amount calculation means (61). The movement command input means (68) is composed of a keyboard (60d).

The inclination correcting means (63) of the conventional NC device (60) operates as follows. Inclination correction means (6
3) is the X-axis received from the movement amount calculation means (61),
When correcting the movement amount data of the Y axis and the Z axis, first, the memory (60b) is read, and it is determined whether or not the inclination angle of the workpiece in the horizontal direction is set to zero. And
When the tilt angle is 0, the received movement amount data of the X-axis, Y-axis, and Z-axis is directly output to the axis control means (64) without performing the correction process. If the tilt angle is not 0,
The X-axis and Y-axis movement amount data is corrected according to the inclination angle. Then, the corrected X-axis and Y-axis movement amount data and the uncorrected Z-axis movement amount data are output to the axis control means (64).

Next, with reference to FIG. 12, a method of detecting the posture of the work placed on the table in the conventional NC electric discharge machine will be described. The NC device (80) of the conventional NC electric discharge machine shown in FIG. 12 includes a CPU (80a) and a memory (80).
b), axis control device (80c), keyboard (80d),
The display device (80e) and the bus (80f) are provided. The functions of these elements are the same as the functions of each element of the NC device (60) in FIG. 10.

The servo motor (91a) for driving the X axis is
It is driven via the X-axis drive circuit (95a) according to the X-axis control signal sent from the axis control device (80c). Y
The servo motor (91b) for driving the axis is used for the axis control device (8
0c), the Y-axis drive circuit (95b) drives the Y-axis control signal. The table (92) is moved in the horizontal direction by both the servo motors (91a) (91b). Electrodes (not shown) are moved in the vertical direction by a servo motor (not shown) for driving the Z-axis. The X axis, the Y axis, and the Z axis are set in the same manner as the axes of the NC electric discharge machine shown in FIG.

In the NC electric discharge machine of FIG. 12, the reference plane (S) of the work (W) placed on the table (92).
When detecting the inclination state of No. 1, first, a point A is set near one end of the reference surface (S), and a point B is set near the other end of the reference surface (S). Next, the dial type measuring instrument (100) is fixed near the table (92), and its contact is brought into contact with the point A of the reference surface (S) to read the dial scale.

Then, the keyboard (80d) is operated to input a movement command to the NC device (80), and the table (9
2) Move a little in the X-axis direction. In this way, the contact of the measuring instrument (100) is brought into contact with the reference surface (S) at a point next to the point A, and the dial scale is read again at that point. After that, the same operation is repeated, and by measuring the distance between the measuring instrument (100) and the reference plane (S) at a plurality of points from the A point to the B point, the reference plane (S) can be measured with respect to the X axis. Detects whether or not it is inclined.

When the inclination of the reference surface (S) is determined as described above, the contact of the measuring instrument (100) is once separated from the reference surface (S), and the orientation of the workpiece (W) is changed according to the inclination. To change. Then, the same operation as described above is performed again to detect the inclination state of the reference surface (S). After that, the same operation is repeated as necessary so that the reference surface (S) is in the optimum tilt state.

[0020]

In the conventional NC device (60) shown in FIGS. 10 and 11, only the horizontal (two-dimensional) tilt correction is possible, and the table (7
The vertical inclination of the work (W) caused by 2) and the jig cannot be dealt with. Therefore, it is necessary to manually position the work (W) so that the work (W) is not tilted in the vertical direction, and as a result, not only skill but also a long time is required for the work positioning work. There is a point. Further, since the processing is performed while allowing an error due to the inclination in the vertical direction, there is a problem that high processing accuracy cannot be obtained. In order to solve these problems, it is conceivable to correct the vertical inclination of the work (W) by a machining program. However, this causes a problem that the machining program becomes complicated.

Further, the work (W) is manufactured by the method shown in FIG.
When detecting the inclination state of the reference surface (S), the operator determines the inclination state of the reference surface (S) by reading the scale of the dial of the measuring instrument (100) while repeatedly moving and stopping the table (92). Therefore, not only the work is complicated but also the judgment is inaccurate.

Therefore, an object of the present invention is that it is not necessary to strictly adjust the posture of the work so that the work placed on the table of the machine tool is not tilted in the horizontal direction and the vertical direction. An object of the present invention is to provide an NC device that can perform high-precision machining with a machining program that does not take into consideration. Another object of the present invention is to provide a work posture detecting device capable of easily and accurately detecting the posture of a work placed on a table of a machine tool.

[0023]

The NC device of the present invention comprises:
A movement amount calculation means for calculating the movement amount of each control axis in accordance with the movement command, and the movement amount data of each control axis calculated by the movement amount calculation means, in the horizontal direction of the workpiece placed on the table of the machine tool. Horizontal inclination correcting means for correcting the inclination of the workpiece and the movement amount data of each control axis calculated by the movement amount calculating means are corrected according to the vertical inclination of the workpiece placed on the table of the machine tool. It is characterized by comprising vertical tilt correction means and axis control means for controlling each of the control axes based on the movement amount data corrected by the horizontal tilt correction means and the vertical tilt correction means.

It is preferable that the NC device of the present invention further comprises display means for displaying the movement amount data of each control axis which is corrected according to the inclination of the workpiece in the horizontal and vertical directions.

The work posture detecting apparatus of the present invention comprises detection information input means for inputting detection information for instructing a method of detecting the position of the reference plane of the work placed on the table of the machine tool.
According to the detection information input by the detection information input means, each control axis of the machine tool is controlled to detect the position of the reference plane of the workpiece at a plurality of points, and a plurality of points obtained by the detection means. It is characterized by further comprising: a calculating means for calculating the graphic data based on the position data; and a display means for displaying the posture of the reference plane of the work as a graphic based on the graphic data obtained by the calculating means.

[0026]

According to the NC device of the present invention, in addition to the horizontal inclination correcting means for correcting the movement amount data in accordance with the horizontal inclination of the workpiece placed on the table of the machine tool, the NC apparatus also responds to the vertical inclination of the workpiece. Since the vertical inclination correcting means for correcting the movement amount data is provided, even if the workpiece has an inclination not only in the horizontal direction but also in the vertical direction, the movement amount data in which those inclinations are corrected can be obtained. Therefore, it is not necessary to perform strict posture adjustment so that the work is not inclined in the horizontal direction or the vertical direction. Further, it is possible to perform high-precision machining by a machining program that does not consider the inclination of the work.

The work posture detecting device of the present invention detects the position of the reference plane of the work placed on the table of the machine tool at a plurality of points by controlling each control axis of the machine tool.
The posture of the reference plane of the work is graphically displayed based on the obtained position data of a plurality of points. Therefore, the posture of the work can be detected easily and accurately.

[0028]

【Example】

(Structure of NC device) An embodiment of the NC device of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a functional block diagram of an NC electric discharge machine equipped with an embodiment of the NC device of the present invention.

The NC device (10) of the present invention comprises a movement amount calculating means (11), a tilt angle input means (12), a horizontal tilt correcting means (13a) and a vertical tilt correcting means (13).
b) the inclination correction means (13) and the axis control means (1
4), a movement amount detection means (15), a coordinate value calculation means (16), a display means (17), a movement command input means (18), and a movement amount evaluation means (19). .

The hardware configuration of the NC device (10) of the present invention is the same as that of the conventional NC device (60) shown in FIG. The XYZ coordinate system set on the table (72) and the electrode (73) is also the same as that of the conventional NC device (60) shown in FIG.

The movement amount calculation means (11) uses the movement command read from the machining program P or the movement command input from the movement command input means (18) to determine the X-axis and Y-axis.
The amount of movement of the axes and the Z-axis is calculated, and the obtained amount of movement data is sent to the horizontal inclination correcting means (13a).

The tilt angle input means (12) inputs the horizontal tilt angle data of the work placed on the table (72) to the horizontal tilt correction means (13a), and the work tilts in the vertical direction. The angle data is input to the vertical inclination correction means (13b). The input inclination angle data in the horizontal and vertical directions is stored in a memory (not shown).

Here, "the inclination angle of the work in the horizontal direction"
Means the angle formed by the vertical reference plane of the workpiece with respect to the X axis or the Y axis in the XY plane. "The vertical angle of inclination of the work" means that the reference plane in the horizontal direction of the work is X-
It means an angle formed with respect to the X axis or the Z axis in the Z plane, or an angle formed with respect to the Y axis or the Z axis in the YZ plane.

The horizontal inclination correcting means (13a) corrects the X-axis and Y-axis movement amount data in accordance with the horizontal inclination of the workpiece placed on the table (72), and the corrected X-axis and Y-axis are corrected.
The axis movement amount data and the uncorrected Z axis movement amount data are sent to the vertical inclination correction means (13b). This correction is based on the XY preset in the NC device (10).
-Z axis system around the origin by horizontal tilt angle X-
It is performed by rotating in the Y plane.

The vertical inclination correcting means (13b) is an X-axis sent from the horizontal inclination correcting means (13a) according to the vertical inclination of the workpiece placed on the table (72).
Corrected movement data of Y-axis and Z-axis, corrected X-axis, Y
The movement amount data of the axes and the Z-axis are sent to the axis control means (14), the coordinate value calculation means (16) and the movement amount evaluation means (19). This correction is performed by rotating a preset XYZ coordinate system in the NC device (10) around the origin in the XZ plane or the YZ plane by an inclination angle in the vertical direction.

The axis control means (14) uses X-axis, Y-axis, and Z-axis servomotors (based on the X-axis, Y-axis, and Z-axis movement amount data sent from the vertical inclination correction means (13b). 7
Control signals are sent to 1). The servo motor (71) for each axis operates according to the control signal, moves the table (72) in the X-axis or Y-axis direction, and moves the electrode (73) in the Z-axis direction.

The moving amount detecting means (15) is provided with a table (7
2) and the movement amount of the electrode (73) are detected, and the detected movement amount data is fed back to the axis control means (14). Also, the movement amount data is used as coordinate value calculation means (16).
Send to.

The coordinate value calculation means (16) is based on the movement amount data of the X-axis, Y-axis, and Z-axis sent from the movement amount detection means (15), and the X-axis, Y-axis, and Z-axis at each time. Calculate the coordinate value of. X-axis, Y-axis obtained by this calculation,
The Z-axis coordinate value data is after the work inclination correction. The coordinate value calculation means (16) also uses the X-axis, Y-axis, and Z-axis movement amount data sent from the vertical inclination correction means (13b) to determine the X-axis, Y-axis, and
Calculate the Z-axis coordinate value. X obtained by this calculation
The coordinate value data of the axes, the Y-axis, and the Z-axis are those after the work inclination correction, but the coordinate value calculation means (16)
The horizontal tilt correction and the vertical tilt correction are canceled for the corrected X-axis, Y-axis, and Z-axis coordinate value data, and the movement amount data before correction is calculated.

Therefore, the coordinate value calculation means (16) can obtain both the coordinate value data before the correction process and the coordinate value data after the correction process. The coordinate value data of each axis thus obtained is sent to the display means (17) and the movement amount evaluation means (19).

The display means (17) is a coordinate value calculation means (1
X before and after correction processing sent from 6)
The coordinate value at each time is displayed based on the coordinate value data of the axis, the Y axis, and the Z axis. Also, a movement amount evaluation means (19)
On the basis of the data sent from the device, whether or not the difference between the actual movement amount of the table (72) and the electrode (73) and the movement amount instructed by the movement command is within a predetermined range is displayed.

The movement command input means (18) is used when the operator manually inputs a movement command. The input movement command is sent to the movement amount calculation means (11).

The movement amount evaluation means (19) is sent from the movement amount detection means (15) based on the movement amount data before correction (movement amount of movement command) obtained by the coordinate value calculation means (16). The movement amount data (actual movement amount) is evaluated, and if the difference between the two is not within the predetermined range, error information is sent to the display means (17). In response to this error information, the display means (17) displays "error" and notifies the operator to that effect.

(Operation of NC Device) Next, the operation of the NC device (10) having the above configuration will be described with reference to FIGS. The work (W) placed on the table (72) is
As shown in FIGS. 5 and 6, the “horizontal tilt angle”, that is, the angle formed by the vertical reference plane (S1) with respect to the X axis in the XY plane is θ, and the “vertical tilt angle”, that is, the horizontal direction. The angle formed by the reference plane (S2) in the direction with respect to the X axis in the XZ plane is φ.

The horizontal tilt angle θ and the vertical tilt angle φ are preliminarily measured by an operator and input from, for example, a keyboard. The input tilt angle data is stored in the memory.

(Operation of Horizontal Inclination Correction Means) NC Device (1
The operation of the horizontal inclination correcting means (13a) of 0) is as shown in the flowchart of FIG. In step S1, the X-axis calculated by the movement amount calculation means (11) based on the movement command read from one block of the machining program P or the movement command for one block input by the movement command input means (18), Receives Y-axis and Z-axis movement amount data.

In step S2, the memory is read and it is determined whether or not the horizontal tilt angle θ is set to zero. If θ is not 0, the process proceeds to step S3,
Correct the X-axis and Y-axis movement amount data. The Z-axis movement amount data is not corrected.

The X axis in the XYZ coordinate system before correction,
Y-axis, and each X _0, Y _0, Z ₀ the movement amount data of the Z-axis, X-axis in the X'-Y'-Z 'coordinate system after horizontal tilt correction, Y-axis, the movement amount data of the Z axis X ₁ , Y ₁ , respectively
If Z ₁ is set, the correction in step S3 is performed according to the following equation (1).

[0048]

[Equation 1]

In the equation (1), as shown in FIG. 5, the XYZ coordinate system, which is the coordinate system before correction, is used as the origin O in the XY plane.
Means to rotate about the angle θ. In the X′-Y′-Z ′ coordinate system obtained by this rotation, the horizontal tilt angle θ becomes 0, and the horizontal tilt of the reference plane (S1) does not exist. Since Z ₀ is not included in the equation (1), Z ₀ and Z ₁ are always equal.

In step S4, X-axis, Y-axis, and Z-axis movement amount data X ₁ obtained by the correction in step S3,
Set Y ₁ and Z ₁ to the output.

When θ is 0 in step S2, the process proceeds to step S5, and the X axis and Y received in step S1.
The movement amount data X ₀ , Y ₀ , Z ₀ of the axis and the Z axis are directly set to the output as the corrected movement amount data X ₁ , Y ₁ , Z ₁ .

At step S6, the movement amount data X ₁ set at the output at step S4 or step S5,
Y ₁ and Z ₁ are sent to the vertical inclination correction means (13b). After that, the same operation is repeated for each block.

(Operation of Vertical Tilt Correcting Means) Next, the vertical tilt correcting means (13b) will be described with reference to the flowchart of FIG.
The operation of will be described. In step S11, the X-axis, Y-axis, and Z-axis movement amount data X ₁ , Y ₁ , and Z ₁ sent from the horizontal inclination correction means (13a) are received.

In step S12, the memory is read and it is determined whether or not the vertical tilt angle φ is set to zero. If φ is not 0, the process proceeds to step S13, and the X-axis, Y-axis, and Z-axis movement amount data X ₁ , Y ₁ , and Z ₁ are corrected. X-axis in X "-Y" -Z "coordinate system after the vertical tilt correction, Y-axis, the respective movement amount data of the Z axis X _2, Y _2, and Z _2, the correction of the step S13 following formula ( Follow 2).

[0055]

[Equation 2]

In the equation (2), as shown in FIG. 6, the XYZ coordinate system, which is the coordinate system before correction, is used as the origin O in the XZ plane.
Means to rotate about by an angle φ. In the X "-Y" -Z "coordinate system obtained by this rotation, the vertical tilt angle φ becomes 0, and the vertical tilt of the reference plane S2 does not exist.

In step S14, the X-axis, Y-axis, and Z-axis movement amount data X ₂ , Y ₂ , and Z ₂ obtained by the correction in step S13 are set as outputs.

If φ is 0 in step S12, the process proceeds to step S15, and the X received in step S11 is received.
The movement amount data X ₁ , Y ₁ and Z ₁ of the axis, Y axis and Z axis are directly set to the output as the corrected movement amount data X ₂ , Y ₂ and Z ₂ .

In step S16, the movement amount data X ₂ set in step S14 or step S15,
Y ₂ and Z ₂ are sent to the axis control means (14). After that, the same operation is repeated for each block.

(Operation of Coordinate Value Calculating Means) Next, the operation of the coordinate value calculating means (16) will be described with reference to the flowchart of FIG. In step S21, the X-axis, Y-axis, and Z-axis movement amount data X ₂ , Y ₂ , and Z ₂ sent from the vertical inclination correction means (13b) are received. It also receives the movement amount data of the X-axis, Y-axis, and Z-axis sent from the movement amount detecting means (15).

In step S22, the memory is read out and it is determined whether or not the vertical tilt angle φ is set to zero. If φ is not 0, the process proceeds to step S23, and the vertical inclination correction of the X-axis, Y-axis, and Z-axis movement amount data X ₂ , Y ₂ , and Z ₂ is canceled. This cancellation of correction is performed according to the following equation (3).

[0062]

[Equation 3]

The equation (3) cancels the correction performed according to the equation (2), and the X "-Y" -Z "coordinate system has an angle φ around the origin O in the X" -Z "plane. It means that it rotates in the opposite direction only.
X-axis in the -Z "coordinate system, Y-axis, the movement amount data X ₂ in the Z-axis, Y _2, Z ₂ is, movement amount data X ₁ in X'-Y'-Z 'coordinate system, Y _1, Z ₁ Return to.

In step S22, the vertical tilt angle φ is 0.
If it is, the movement amount data X _2, Y _2, without correction cancellation of Z _2, X-axis, Y-axis, the movement amount data X _2, Y ₂ and Z-axis,
As movement amount data X ₁ and Z _2, Y _1, fly as Z ₁ in step S24.

In step S24, the memory is read and it is determined whether or not the horizontal tilt angle θ is set to zero. If θ is not 0, the process proceeds to step S25, the horizontal tilt correction of the X-axis, Y-axis, and Z-axis movement amount data X ₁ , Y ₁ , Z ₁ is canceled, and then the process proceeds to step S26. This cancellation of correction is performed according to the following equation (4).

[0066]

[Equation 4]

The equation (4) cancels the correction performed according to the equation (1), and the X'-Y'-Z 'coordinate system has an angle θ around the origin O in the X'-Y' plane. It only means rotating in the opposite direction. By this rotation, X'-Y '
Movement amount data X ₁ in -Z 'coordinate system, Y _1, Z ₁ is
Movement amount data X ₀ , Y ₀ , Z ₀ in the XYZ coordinate system
Return to.

In step S24, the horizontal tilt angle θ is 0.
If it is, without correction cancellation of the movement amount data X _1, Y _1, Z _1, X-axis, Y-axis, the movement amount data X ₁ in the Z-axis, Y _1,
Z _{1 is used as it} is as movement amount data X ₀ , Y ₀ , Z ₀ , and the process jumps to step S26.

In step S26, the movement amount data X ₀ , Y ₀ , Z ₀ obtained by canceling the correction is used as the movement amount evaluation means (19).
Send to. Further, these movement amount data X ₀ , Y ₀ , Z
The X-axis, Y-axis, and Z-axis coordinate values before correction are calculated based on ₀ , and the obtained coordinate value data is sent to the display means (17). After that, the same operation is repeated for each block.

The processing locus changes as shown in FIGS. 5 and 6 depending on whether or not the inclination angle is corrected. In FIG. 5, since the work (W) is inclined by the angle θ in the horizontal direction, the machining which should be orthogonal to the reference plane (S1) of the work (W) (parallel to the Y axis) when not corrected. Although the locus is inclined by the angle θ, when it is corrected, the machining locus becomes parallel to the Y ′ axis and orthogonal to the reference plane (S1) of the work (W). Therefore, the machining program P created with the inclination angle θ of 0 can be used to perform machining with high accuracy.

In FIG. 6, since the work (W) is inclined in the vertical direction by the angle φ, it should be parallel to the reference plane (S2) of the work (W) (parallel to the X axis) without correction. The machining locus of tilts by the angle φ, but if corrected,
The machining locus is parallel to the X ′ axis and parallel to the reference plane (S2) of the work (W). Therefore, even if there is an inclination in the vertical direction, it is possible to perform machining with high accuracy using the machining program (P) created with the inclination angle φ set to 0.

As described above, the NC device (1
0) corrects the inclination of the work (W) in the horizontal direction and the vertical direction, so that the work can be performed with high accuracy.
Further, since it is not necessary to place the work (W) on the table (72) while performing the parallel alignment strictly, the setup time is greatly shortened and the working efficiency is remarkably improved. Further, since the coordinate value in which the inclination of the workpiece (W) is corrected and the coordinate value in which the inclination is not corrected are displayed, there is an advantage that the progress of the machining operation can be accurately known.

In the above embodiment, the inclination angle input means (1
It was described that the operator inputs the tilt angle data from the keyboard (54) and sets it by using the keyboard (54) as 9), but the tilt angle was detected and obtained by using the work posture detecting device described below. The inclination angle data may be automatically input. Further, the vertical tilt angle is the tilt angle φ with respect to the X axis in the XZ plane, and the horizontal tilt angle is the tilt angle θ with respect to the X axis in the XY plane. An inclination angle with respect to the Y axis in the YZ plane may be used as the inclination angle, or an inclination angle with respect to the Y axis may be used as the horizontal inclination angle.

(Structure of Work Posture Detecting Device) Next, one embodiment of the work posture detecting device of the present invention will be described with reference to the accompanying drawings. This work posture detecting device is suitable as the inclination angle input means (19) of the NC device (10).

FIG. 8 is a functional block diagram of the work posture detecting device according to the present invention. The work posture detecting device (30) of the present invention comprises a detection information input means (31), a detection means (32), a calculation means (33), and a display means (34).

The detection information input means (31) inputs, to the detection means (32), detection information indicating a method for detecting the position of the reference plane of the work placed on the table of the machine tool. The operator inputs the detection information when detecting the posture of the work.

The detection means (32) controls the control axes (for example, X axis, Y axis, Z axis) of the machine tool in accordance with the detection information input by the detection information input means (31), and thus the workpiece reference. The position of the surface is detected at multiple points.

The calculating means (33) calculates graphic data based on the position data at a plurality of points obtained by the detecting means (32).

The display means (34) graphically displays the posture (for example, the inclination state) of the reference plane of the work based on the graphic data obtained by the computing means (33).

FIG. 7 is a hardware configuration diagram showing an embodiment in which the work posture detecting device of the present invention is applied to an NC electric discharge machine. In FIG. 7, elements corresponding to those of the NC electric discharge machine shown in FIG. 12 are designated by corresponding reference numerals. The Z-axis driving servomotor (51c) is driven via the Z-axis drive circuit (55c) in response to the Z-axis control signal sent from the axis control device (40c). The electrode (53) is moved in the vertical direction by the servo motor (51c). The table (52) includes a servo motor (51a) for driving the X axis and a servo motor (51b) for driving the Y axis.
The movement of moves horizontally.

The electrode (53) detects the position of the work (W) by coming into contact with the work (W), and is dedicated to position detection here. However, normal processing electrodes can also be used. When the contact sensing circuit (56) senses the contact of the electrode (53) with the work (W), it sends a sensing signal to the NC device (40). The NC device (40) receives the detection signal, detects the position of the contact point, and calculates graphic data based on the obtained position data. The graphic data obtained by the calculation is sent to the display device (40e) and displayed as a graphic.

The detection information input means (31) comprises a keyboard (40d). The detection means (32) is NC
Device (40), X-axis, Y-axis, Z-axis drive circuit (55
a) (55b) (55c), X-axis, Y-axis, Z-axis servomotors (51a) (51b) (51c), electrodes (5)
3) and a touch sensing circuit (56). The computing means (33) is composed of an NC device (40). The display means (34) is composed of a display device (40e).

(Operation of Work Inclination Display Device) Next, the operation of the work posture detecting device (30) of the present invention having the above configuration will be described. Here, a case will be described in which the attitude of the reference plane (S1) in the vertical direction of the work (W) shown in FIG. 7 is detected.

First, the operator operates the keyboard (40d) to set the measurement range of the vertical reference plane (S1) of the workpiece (W) whose posture is to be detected. This setting is performed by setting the position coordinates of points A and B, which are end points on both sides of the measurement range. The position coordinate data of the set points A and B is stored in the memory (40
It is stored in b).

Next, the NC device (40) is put into an operating state,
X-axis, Y-axis, and Z-axis drive servo motors (51a) (5
1b) (51c) is activated to move the tip of the electrode (53) to A
Stop near the point. Then press the start button. Then, by the control program, the table (52)
Automatically moves to bring the tip of the electrode (53) into contact with the reference surface (S1) at point A. Then, the touch sensing circuit (56) sends a sensing signal to the NC device (40). N
The C device (40) detects the position of the point A by this detection signal and stores the position coordinates in the memory (40b).

Next, the NC device (40), based on the previously set measurement range data of the reference surface (S1) and the number of times of detection set in advance by the parameter, sets the second position next to the point A.
The position coordinates of the contact point are calculated. Then, the X-axis and Y-axis driving servomotors (51a) (51b) are operated to move the second
The tip of the electrode (53) is brought into contact with the reference surface (S1) at the contact point, and the position coordinates of the second contact point are stored in the memory (40b).
To store. After that, the same operation is repeated, and the position coordinates of the plurality of contact points from point A to point B are stored in the memory (40b).

Next, the NC device (40) reads out the obtained position coordinate data of a plurality of contact points from the point A to the point B from the memory (40b), and based on the position coordinate data, the graphic data is obtained. Calculate At that time, point A and B
The origin position and scale are set so that the graphic is drawn on the screen of the display device (40e) with an appropriate arrangement and size based on the position coordinate data of the point.

Next, the graphic data and the origin position and scale data obtained by the calculation are displayed by the display device (40
e), where it is displayed as a graphic. As the figure to be displayed, for example, as shown in FIG. 9, there is a figure in which the position of each contact point is indicated by a point and the points are connected by a straight line. In this way, when the positions of the plurality of contact points on the reference plane (S1) are displayed as a figure, this figure and the X-axis and Y
By looking at the relationship with the axis, it is possible to immediately and accurately know the posture of the reference surface (S1), that is, the tilted state.

Even when detecting the attitude of the horizontal reference plane (S2) of the work (W) shown in FIG. 7, the measurement range is set appropriately on the reference plane (S2), in the same manner as above. Can be done. Therefore, by using the work posture detecting device (30) of the present invention, not only the horizontal tilt condition of the work (W) but also the vertical tilt condition of the work (W) can be used. Deflection of the surface) can also be detected.

Since the tilt angle of the reference plane (S1) can be easily calculated based on the position coordinate data of a plurality of contact points from point A to point B, the NC device (40) can use the reference plane ( If the tilt angles of S1 and S2 are calculated and stored in the memory (40b), the tilt angle can be read out from the memory (40b) and sent out as necessary. By doing so, the work posture detecting device (30) of the present invention becomes suitable as the inclination angle input means (19) of the NC device (10).

In this embodiment, the position of the work (W) is detected by detecting the contact between the electrode (53) and the work (W). However, if the position of the work (W) can be detected, the other position is detected. It may be a method. Further, the method of detecting the position of the work (W) at a plurality of points is not limited to the method of detecting along the straight line as shown, but also the method of detecting along the curve or the method of detecting in a two-dimensionally wider range. And so on.

In the above description, an example in which the NC device and the work posture detecting device of the present invention are applied to an NC electric discharge machine has been described, but the present invention can also be applied to other machine tools other than the NC electric discharge machine.

[0093]

The NC device of the present invention does not require strict posture adjustment of the work so that the work placed on the table of the machine tool is not inclined in the horizontal direction or the vertical direction. High-precision machining can be performed by a machining program that does not consider inclination. Further, when the display means for displaying the movement amount data of each control axis corrected according to the inclination of the workpiece in the horizontal direction and the vertical direction is provided, in addition to the above effects, the operator can display the actual machining status during machining. There is an effect that can be known. The work posture detecting apparatus of the present invention can easily and accurately detect the posture of the work placed on the table of the machine tool.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an NC electric discharge machine equipped with the NC device of the present invention.

FIG. 2 is a flowchart showing a horizontal tilt correction operation of the NC device of FIG.

FIG. 3 is a flowchart showing a vertical tilt correction operation of the NC device of FIG.

FIG. 4 is a flowchart showing a coordinate value calculation operation of the NC device of FIG.

FIG. 5 is an explanatory diagram showing a horizontal inclination correction operation of a work placed on the table of the NC electric discharge machine.

FIG. 6 is an explanatory diagram showing a vertical inclination correction operation of a work placed on a table of an NC electric discharge machine.

FIG. 7 is a hardware configuration diagram of an embodiment in which the work posture detecting device of the present invention is applied to an NC electric discharge machine.

FIG. 8 is a functional block diagram of the work posture detecting device according to the present invention.

FIG. 9 is an explanatory diagram of a screen displaying a situation of a work reference plane.

FIG. 10 is a hardware configuration diagram of an example of a conventional NC electric discharge machine.

11 is a functional block diagram of the NC electric discharge machine of FIG.

FIG. 12 is a hardware configuration diagram of an NC electric discharge machine showing a method for detecting a work posture in a conventional NC electric discharge machine.

[Explanation of symbols]

10 NC device 11 Moving amount calculation means 12 Tilt angle input means 13 Tilt correction means 13a Horizontal inclination correcting means 13b Vertical tilt correction means 14 axis control means 15 Moving amount detecting means 16 Coordinate value calculation means 17 Display means 18 Movement command input means 19 Position quantity evaluation means 30 Work posture detector 31 Detection information input means 32 detection means 33 computing means 34 display means 40 NC device 40a CPU 40b memory 40c axis control device 40d keyboard 40e display device 40f bus 51a X-axis servo motor 51b Y-axis servo motor 51c Z-axis servo motor 52 tables 53 electrodes 55a X-axis drive circuit 55b Y-axis drive circuit 55c Z-axis drive circuit 56 Touch sensing circuit W work S1, S2 reference plane P machining program

Claims (3)

[Claims] 1. A movement amount calculation means for calculating a movement amount of each control axis according to a movement command, and movement amount data of each control axis calculated by the movement amount calculation means are placed on a table of a machine tool. The horizontal inclination correcting means for correcting the inclination of the work in the horizontal direction, and the movement amount data of each control axis calculated by the movement amount calculating means, the inclination of the work placed on the table of the machine tool in the vertical direction. Vertical tilt correcting means for correcting the control axes according to the movement amount data corrected by the horizontal tilt correcting means and the vertical tilt correcting means. Numerical control device. 2. The numerical controller according to claim 1, further comprising display means for displaying the movement amount data of each control axis which is corrected according to the inclination of the work in the horizontal direction and the vertical direction. 3. A detection information input means for inputting detection information for instructing a detection method of a position of a reference surface of a work placed on a table of a machine tool, and machining according to the detection information input by the detection information input means. Detecting means for controlling each control axis of the machine to detect the position of the reference surface of the work at a plurality of points, and calculating means for calculating graphic data based on the position data of the plurality of points obtained by the detecting means, A work posture detecting apparatus comprising: a display unit that graphically displays the posture of the reference plane of the work based on the graphic data obtained by the calculation unit.