JPH05318278A - X-y table drive control device of machine tool - Google Patents

Abstract

PURPOSE:To enhance the working efficiency of machining a work by furnishing an NC corrective moving speed command value calculating means which calculates the NC corrective moving speed command value by adding/subtracting the measuring value of the work moving amount to/from the second NC moving speed command value calculated by an NC moving speed command value calculating means. CONSTITUTION:An X-Y table on which a work is placed is moved in the X-axis or Y-axis direction for a certain distance, and thereby the work inclination in the Y-axis or X-axis direction when the work inclines on the X-Y table is measured by a micro-distance measuring instrument 23. A corrective moving speed command value calculating means 34 calculates the NC corrective moving speed command value by adding or subtracting the obtained measurement to/ from the NC moving speed command value which is to serve for the preset machining, and the X-Y table is moved by an X-axis drive motor 4 and a Y-axis drive motor 5 on the basis of the NC corrective moving speed command value which has undergone a correction with the work inclination taken into account.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an XY table drive controller for a machine tool, and more particularly to measuring the inclination of a workpiece mounted on a table surface plate of a machine tool or a machine tool with respect to the machine system coordinates, and positioning correction accordingly. For driving and controlling the XY table.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view showing a method for measuring a work inclination in a conventional XY table drive controller for a machine tool. In the figure, 1 is an XY table, 2 is a work set on the XY table 1, 3 is a puppy tester which is a mechanical distance measuring device, and is attached to a fixed point 8 on the machine. 4 is an X-axis drive motor that moves the XY table 1 in the X-axis direction, 5 is a Y-axis drive motor that moves the XY table 1 in the Y-axis direction, and 6 is an XY table 1.
Of the XY table, and 7 indicates the Y-axis direction of the XY table. Reference numeral 11 is an input device such as a keyboard for inputting a moving speed command, 12 is an operator who operates the input device 1 and monitors the pupy tester 3, and 14 is an X-axis and Y-axis drive motor 4 according to the moving speed command of the input device 1. 5 is an NC control device that outputs an NC moving speed command value.

The conventional XY table drive control device for a machine tool is constructed as described above. For example, the operator 12 operates the input device 1 to output the X-axis direction moving speed command, and the X-
The Y table 1 is moved in the X-axis direction 7, for example, and the work 2 on the XY table 1 is moved relative to the puppy tester 3. At this time, if the work 2 is tilted with respect to the movement axis direction of the XY table 1, the relative distance between the Puppy tester 3 and the work 2 becomes closer or farther away, so that the needle 3a of the Puppy tester 3 moves. .. The worker 12 recognizes that the work 2 is tilted with respect to the drive shaft of the machine tool by observing the movement of the needle with the eyes 12a. In addition, the worker who recognizes the tilt is the needle 3a of the Puppy tester 3.
The direction in which the work 2 is tilted is recognized from the moving direction of and the tilt of the work 2 is corrected. After correction, XY again
By moving the table 1, the inclination of the XY table 1 with respect to the movement axis direction is confirmed, and this operation is repeated until the inclination falls within an allowable range.

This is a so-called work leveling work. Various tools to be installed on the machine tool as tools are also installed by performing a leveling operation with respect to the machine drive shaft in a similar or similar manner. When installing a work or tool on a machine tool, it is indispensable to measure the inclination of the work or tool with respect to the drive axis as described above, and is generally performed by the above method. Although the Puppy tester 3 is a measuring instrument capable of measuring a minute change in distance, the measurable range 9 is generally small,
The worker 12 must adjust the distance between the work 2 and the Puppy tester 3 in advance and set it in a measurable range.

FIG. 7 shows an XY of another conventional machine tool.
It is explanatory drawing which shows the method of measuring the workpiece inclination in a table drive control apparatus. In this method, the inclination of the work 2 with respect to the drive axis is automatically measured using a computer. The TV camera 15 photographs the work 2 on the XY table 1 and sends the image information to the computer 16. ,
The computer 16 displays the shape and inclination of the work 2 as an image on the monitor screen of the television 17 based on the image information,
The shape and the inclination of the work 2 are made to be recognized by the operator.

[0006]

In the method of measuring the work inclination in the conventional XY table driving device of the machine tool shown in FIG. 6 as described above, the worker 12 is, for example, XY.
Move the table 1 relative to the Puppy tester 3,
From the movement of the needle 3a of the Puppy tester 3, it is recognized that the workpiece 2 is tilted with respect to the drive axis of the machine tool, and from which direction the needle 3a of the Puppy tester 3 is moving, the workpiece 2 is tilted. Since the inclination of the work 2 is corrected by using the machine tool, the XY table 1 is driven to machine the work 2 on the XY table 1 by a machine tool. However, there has been a problem that a large amount of time is spent on the work and the working efficiency of the work 2 is reduced as a result.

In another conventional method for measuring the work tilt in the XY table drive control device for a machine tool shown in FIG. 7, the position of the work 2 is photographed by the camera 15, and the image information thereof is calculated by the computer 16. The computer 16 displays the shape and inclination of the work 2 as an image on the monitor screen of the television 17 based on the image information.
Object recognition by is not accurate enough to obtain micron-level accuracy like machine tools, etc.
If the shape of is not simple, shape recognition itself becomes difficult. In addition, in most cases where the inclination of the work 2 should be measured, a reference plane is set on the work 2, but there are many problems such as the need to separately input the information into the computer 16. there were. That is, the TV camera 15
And the position of the work 2 by object recognition using the computer 16,
The recognition of inclination was not yet in the practical stage.

The present invention has been made in order to solve such a problem, and automates the measurement of the work inclination to reduce the burden on the operator and improve the workability, and at the same time, the conventional work positioning accuracy is guaranteed. Machine tool that can improve the work efficiency of the workpiece in the cut state
The purpose is to obtain a table drive controller.

[0009]

A work drive controller for a machine tool according to the present invention comprises an X-axis and Y-axis drive motor for moving an XY table on which a work is installed in the X-axis and Y-axis directions. , X for driving and controlling the X-axis and Y-axis drive motors
-Besides the Y-axis motor drive control circuit, the first based on the moving speed command for detecting the inclination of the work from the input device.
The second based on the NC moving speed command value and the moving speed command for processing from the input device or the moving command program.
An NC moving speed command value calculating means for calculating an NC moving speed command value, and a minute distance measurement for measuring the moving distance of the workpiece on the XY table in the X-axis direction or the Y-axis direction and outputting the measured value as an electric signal. And a first NC moving speed command value calculated by the NC moving speed command value computing means to an X / Y-axis motor drive control circuit to drive the XY table in either the X-axis or Y-axis direction. Then, the measured value of the moving amount of the work measured by the fine distance measuring device is added to / subtracted from the second NC moving speed command value of the NC moving speed command value calculating means to calculate the NC corrected moving speed command value, which is calculated as X. An NC correction movement speed command value calculation means for outputting to the Y-axis motor drive control circuit.

Further, display means may be provided for graphically displaying dot data indicating the inclination of the work based on the NC corrected moving speed command value calculated by the NC corrected moving speed command value calculating means.

[0011]

In the present invention, the NC moving speed command value calculating means for detecting the inclination of the work, for example, X, is detected from the input device.
Input the axis movement speed command. The NC moving speed command value calculating means calculates the first NC moving speed command value based on the moving speed command and outputs the first NC moving speed command value to the X / Y-axis motor drive control circuit to drive the X-axis drive motor to set the work. The moved XY table is moved in the X-axis direction by a predetermined distance. At this time, if the work on the XY table is tilted, the fine distance measuring device measures the moving distance of the work in the Y-axis direction as the tilt, and the measured value is used as an electric signal to calculate NC correction moving speed command value calculating means. Output to. The NC correction movement speed command value calculation means uses an X / X for processing the measured value of the minute distance measuring device from the input device or the movement command program.
An NC corrected moving speed command value is calculated by adding / subtracting to / from the second NC moving speed command value calculated by the NC moving speed command value calculating means based on the Y-axis moving speed command, and this is used for X / Y axis motor drive control. Output to the circuit. Therefore, since the XY table is moved based on the NC correction movement speed command value corrected in consideration of the inclination of the work, the setup work for leveling the work is automated and the work is machined by the machine tool. Will be seen.

Further, since the display means is adapted to perform graphic drawing display as dot data indicating the inclination of the work on the basis of the NC corrected moving speed command value calculated by the NC corrected moving speed command value calculating means, the operator displays the display. By recognizing the inclination of the work by observing the graphic drawing display of the means, the work can be leveled manually.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
2 is a schematic diagram showing a work inclination measuring portion of the same embodiment, FIG. 3 is an explanatory view showing an example of a work inclination measurement result according to the same embodiment displayed on a television, and FIG. 4 is another work inclination according to the same embodiment. It is explanatory drawing which shows an example which displayed the measurement result on the television. In the figure, the same configurations as those of the conventional example are denoted by the same reference numerals as those of the conventional example, and the description of the duplicated configurations is omitted. Two
Reference numeral 3 denotes a micro distance measuring device capable of measuring a micro distance, and outputs the measured value as an electric signal. 24 is NC
In the control device, the worker 12 inputs a moving speed command using the input device 11 such as a keyboard attached to the operator, and the NC moving speed command value created based on the moving speed command is used as the X-axis drive motor 4 or Y. Output to the axis drive motor 5 and X
-Y drives the table 1. In addition, this NC
A display device such as the television 17 is installed in the control device 24 so that the input state of commands, the movement state of the drive shaft of the machine tool, and the like can be monitored.

Next, the internal structure of the NC controller 24 will be described. Reference numeral 31 denotes an NC moving speed command value computing means of the NC control device 24, which is a first NC moving speed command value based on an X-axis or Y-axis moving speed command for detecting the inclination of the workpiece 2 from the input device 11. The second NC moving speed command value is calculated based on the moving speed command of the X and Y axes for machining from the moving command program stored in advance in the input device 11 or the moving command program memory 32. Reference numeral 33 is an NC moving speed command value memory for storing the second NC moving speed command value calculated by the NC moving speed command value calculating means 31. Reference numeral 34 denotes an NC correction moving speed command value calculating means, which is the second value calculated by the NC moving speed command value calculating means 31.
The NC corrected moving speed command value is calculated by adding / subtracting the measured value of the moving amount of the workpiece 2 measured by the minute distance measuring device 23 to / from the NC moving speed command value. Reference numeral 35 denotes an NC correction moving speed command value memory for storing the NC correction moving speed command value calculated by the NC correction moving speed command value calculating means 34.
Reference numeral 36 denotes the first NC moving speed command value of the NC moving speed command value calculating means 31 or the NC correction moving speed command value calculating means 34.
NC correction movement speed command values are input, and the X / Y-axis motor drive control circuit 36 drives and controls the X-axis drive motor 4 and the Y-axis drive motor 5 based on these command values. N
The C control device 24 is composed of NC moving speed command value calculation means 31 to an X / Y axis motor drive control circuit 36.

Next, the operation of the embodiment of the present invention will be described. First, from the input device 11 to the NC control device 24
For example, an X-axis moving speed command for detecting the inclination of the work is output to the NC moving speed command value calculating means 31. N
The C moving speed command value calculating means 31 calculates the first NC moving speed command value based on the moving speed command and outputs the first NC moving speed command value to the XY motor drive control circuit 36 to drive the X-axis drive motor 4 to work. The XY table 1 for which 2 is set is moved in the X-axis direction by a predetermined distance. At this time, if the work 2 on the XY table 1 is tilted, the fine distance measuring device 23 measures the movement distance of the work 2 in the Y-axis direction as the tilt, and the measured value is used as an electric signal to correct the NC correction movement speed. It is output to the command value calculation means 34.

The above description is for measuring the inclination of the work 2 with respect to the X-axis, and will be described in detail with specific numerical values. If the X-axis movement speed command set by the input device 11 is set to drive the XY table 1 by 20 mm in the X-axis direction, X = 20 and Y = 0. Where X-
When the Y table 1 is driven by 20 mm in the X-axis direction, the tip of the fine distance measuring device 23 corresponding to the drive shaft of the machine tool is tilted relative to the reference plane of the work 2 because the work 2 is tilted. It will move by αmm in the axial direction.
That is, the output α of the minute distance measuring device 23 is given as the measuring device output along with the movement in the X-axis direction.

Further, the NC moving speed command value computing means 31 is inputted with the moving speed commands of the X and Y axes for machining the moving command program stored in the moving command program memory 32, and the NC moving speed command is inputted. The second NC moving speed command value calculated by the value calculating means 31 is stored in the NC moving speed command value memory 33. The X / Y axis moving speed command is input to the NC moving speed command value calculating means 31 by the input device 11
You may input by.

Next, the NC correction moving speed command value calculating means 3
In 4, the measured value of the minute distance measuring device 23 is added / subtracted to / from the second NC moving speed command value read from the NC moving speed command value memory 33 to calculate the NC corrected moving speed command value, and this is calculated as the X / Y axis motor. Output to the drive control circuit 36. Therefore, since the XY table 1 is moved based on the NC corrected movement speed command value corrected in consideration of the inclination of the work 2, the setup work for leveling the work 2 is automated, and the work 2 by the machine tool is performed. Will be performed with high precision while being accurately positioned.

Further, the NC correction moving speed command value calculation means 3
The NC corrected moving speed command value calculated by No. 4 is stored in the NC corrected moving speed command value memory 35, which is read out and graphically displayed as dot data indicating the inclination of the work on the television 17 which is the display means. It can also be shown to the person. In this case, the operator can recognize the shape of the work 2 itself. For example, FIG. 3 shows the dot data displayed on the screen of the television 17, but since the worker who sees the dot data naturally recognizes the shape of the work 2, the displayed shape 2a is, for example, a rectangle. I know there is.
Therefore, the worker does not have to be aware of how much the dot data is shaped from the actual rectangle, and the information that the worker wants is that the rectangular work 2 is relative to the drive axis of the machine tool. It is nothing but how much it is leaning.

That is, as shown in FIG. 3, it suffices if the inclination 41 can be recognized by looking at the shape displayed as 2a. When the direction of the inclination 41 is known in this way, the inclination 41 of the workpiece 2
Can be corrected and displayed again, and the work can be repeated until it seems to be sufficiently horizontal, so that the leveling work can be performed with the same accuracy as in the conventional case. 40a is the television 1
This is a scale for making it easy to see the tilt on the screen of 7. In this case, the NC moving speed command value calculated by the NC moving speed command value calculating means 31 is input to the X / Y-axis motor drive control circuit 36 to drive the X-axis drive motor 4 and the Y-axis drive motor 5. Then, the work 2 is processed.

FIG. 4 shows another example of data display.
It is not necessary to determine the entire shape of the work 2 in order to measure the inclination of the work 2. For this reason, the operator may run the micro distance measuring device 23 only on the surface determined as the reference surface. FIG. 4 shows an example of the inclination 2 of a reference plane on which the work 2 is placed.
Although it is shown as b, it is simple as a graphic drawing display on the screen of the television 17, but it is possible to provide the operator with sufficient information for performing the work. 40b, 4
0c is a scale for making it easy to see the inclination 2b on the screen of the television 17.

FIG. 5 is another embodiment of the present invention and is an explanatory view for improving workability. When running a small rangefinder on an inclined work, for example, X shown in FIG.
The axial direction is specified by the operator, whereas the Y-axis direction is automatically determined along with the movement of the X-axis. However, since it is better to move at a constant moving speed also in the Y-axis direction, it is desirable to finally perform calculation so that the Y-axis direction in the NC correction moving speed command value becomes constant. Meanwhile, as shown in FIG. 5, the moving speed in the case of adding the moving speed command value F _Y in the Y-axis direction based on the output of the moving speed command value of the X-axis direction F _X and slight distance measuring device 23 becomes F However, by recalculating as F ′, it is possible to move at the same speed as the original moving speed command F _X, and as a result, it is possible to perform correction with improved measurement accuracy.

That is, in FIG. 5, F _V (representing the vector of F) is the movement speed command vector in the X direction F _XV (representing the vector of F _X ) (constant), and movement in the Y direction resulting from the inclination of the work 2 It is a moving speed command vector obtained by combining the speed command vectors F _YV (indicating the vector of F _Y ).
This F _XV is the speed set in advance, and the small distance measuring device 23
Is set to a speed that allows accurate measurement. But,
If the workpiece 2 is tilted, F _XV should be left at the set value in order for the NC controller 24 to output a follow-up movement command in the Y direction so that the minute distance measuring instrument 23 falls within the measurable range. , F is | F _V |> | F _XV |
The moving speed of the small distance measuring device 23 becomes high, which may cause a decrease in measurement accuracy. Therefore, | F _V | = | F
It is decided that F _X ′ is internally calculated to be _XV │ to obtain a moving speed command, that is, F _V ′ = (F _X ′, F _Y ′) = F _X / (F _X ² + F _Y). ² ) α (F _X , F _Y ). In some cases, the reference velocity vector F _XV may be used, and switching is performed depending on whether the designated reference movement direction is X or Y.

[0024]

As described above, according to the present invention, by moving the XY table on which the work is installed by a predetermined distance in the X-axis direction or the Y-axis direction, the XY table can be measured by the fine distance measuring device.
When the work on the table is tilted, the tilt of the work in the Y-axis direction or the X-axis direction is measured, and the measured value is added to or subtracted from the NC moving speed command value for performing preset machining A corrected moving speed command value is calculated, and the X-Y table is moved by driving the X-axis drive motor and the Y-axis drive motor based on the NC corrected moving speed command value corrected in consideration of the inclination of the work. As a result, the setup work for leveling out the work is automated, and the work is processed by the machine tool, which reduces the burden on the setup work for leveling out the worker and greatly reduces the work time. In addition, the working efficiency of the work can be improved while the positioning accuracy of the work is guaranteed.

Further, since the display means is designed to graphically display as the dot data indicating the inclination of the work on the basis of the NC correction moving speed command value, the operator can see the graphical display of the display means to display the inclination of the work. By recognizing it, there is an effect that the work can be leveled manually.

[Brief description of drawings]

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

FIG. 2 is a schematic view showing a work inclination measuring portion of the embodiment.

FIG. 3 is an explanatory diagram showing an example in which a work tilt measurement result according to the embodiment is displayed on a television.

FIG. 4 is an explanatory diagram showing an example in which another work tilt measurement result according to the embodiment is displayed on a television.

FIG. 5 is an explanatory diagram showing another embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a method for measuring a work tilt in a conventional XY table drive control device for a machine tool.

FIG. 7 is an explanatory diagram showing a method of measuring a work inclination in another conventional XY table driving device of a machine tool.

[Explanation of symbols]

 1 XY Table 2 Work 4 X Axis Drive Motor 5 Y Axis Drive Motor 11 Input Device 17 Television (Display Means) 23 Minute Distance Measuring Instrument 31 NC Moving Speed Command Value Calculating Means 34 NC Correcting Moving Speed Command Value Calculating Means 36 X・ Y-axis motor drive control circuit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location // B23Q 1/18 A 8107-3C

Claims (2)

[Claims] 1. An XY table on which a work is installed,
An X-axis drive motor that moves the XY table in the X-axis direction, a Y-axis drive motor that moves the XY table in the Y-axis direction, and an XY that drives and controls the X-axis and Y-axis drive motors.
In order to perform machining from the first NC moving speed command value and the input device or the moving command program based on the axis motor drive control circuit and the moving speed command of the X axis or the Y axis for detecting the inclination of the work from the input device. NC moving speed command value calculating means for calculating the second NC moving speed command value based on the X / Y axis moving speed command, and measuring the moving distance of the workpiece on the XY table in the X-axis direction or the Y-axis direction. Then, the small distance measuring device that outputs the measured value as an electric signal and the first NC moving speed command value calculated by the NC moving speed command value calculating means are X.
・ The movement amount of the work measured by the micro distance measuring device is output to the Y-axis motor drive control circuit and the XY table is driven in either the X-axis or Y-axis direction by the X-axis or Y-axis drive motor. NC for adding / subtracting the measured value to / from the second NC moving speed command value calculated by the NC moving speed command value computing means to calculate an NC corrected moving speed command value and outputting it to the X / Y-axis motor drive control circuit. An XY table drive control device for a machine tool, comprising: a corrected moving speed command value calculation means. 2. A display means for graphically displaying as dot data indicating the inclination of the work based on the NC correction movement speed command value calculated by the NC correction movement speed command value calculation means. Item 2. An XY table drive controller for a machine tool according to Item 1.