JPH06119025A - Numerical controller - Google Patents

Abstract

PURPOSE:To obtain distance between the present position of a tool and a designated form so as to display it for easily working a trial piece through the use of a general-purpose machine tool. CONSTITUTION:A graphic storage means 1 stores the designated forms of an obliquely straight line and an arc, which are inputted by operating a keyboard 17 by an operator, in accordance with guidance information displayed in the display device 16 through a graphic control circuit 15. A present position storage means 2 updates and stores the present position of the tool in accordance with a pulse signal HP when the pulse signal HP from a shift command means is detected by permitting the operator to execute an operation. When reset signals for respective are detected from the axis command means, the present position of the tool for the axis is initialized to '0'. A distance calculation means 3 calculates distance between the designated form stored in the graphic storage means 1 with the present position of the tool stored in the present position storage means 2, and it is displayed on the display device 16 through the graphic control circuit 15.

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 for controlling a machine tool, and more particularly to a numerical control device for controlling a machine tool for machining a prototype or the like.

[0002]

2. Description of the Related Art The technological progress of numerically controlled machine tools is remarkable, and it is possible to machine workpieces with complicated shapes at high speed and with high precision. Further, at present, a workpiece having a complicated shape cannot be processed without a numerically controlled machine tool.

Further, in order to create a machining program for machining, an interactive numerical control device in which an interactive program creating function is added to a numerical control device, and automatic programming for easily creating a complicated machining program Devices are widely used.

Of course, in order to use these numerical control devices, it is necessary to precisely define machine coordinates, machine origins, program coordinates, machining origins, etc., and create a rigorous machining program. Then, when machining a large number of workpieces, these interactive numerical control devices and automatic programming devices can be used, but in some machining to create prototypes or molds, work attachment / detachment, tool attachment and machining programs General-purpose milling machines, general-purpose lathes, etc. are used which require less time for setup such as making.

However, the number of operators who can use these general-purpose machine tools is decreasing. Also,
Straight line machining is not a problem, but diagonal straight line machining, arc machining, etc. are difficult to machine with these general-purpose machine tools.

On the contrary, if a general numerical control machine tool is used, it is necessary to accurately define the machine coordinates, machine origin, program coordinates, machining origin, etc. It takes too much programming to process a part.

In order to solve such a problem, the applicant of the present invention has proposed a numerical control device capable of performing a simple machining of a prototype or the like by using a general-purpose machine tool in Japanese Patent Application No. 4-23183.
I am applying for No. 6.

[0008]

However, in the case of simple machining of a prototype or the like, in general, when the machining is performed while operating the manual pulse generator or the jog feed button to confirm the machining process in order, The distance between the specified shape such as a diagonal straight line or arc and the current position of the tool was unknown. Therefore, it is difficult to approach the tool to the designated shape by operating the manual pulse generator or the jog feed button.

The present invention has been made in view of the above point, and in order to easily perform a simple machining of a prototype or the like by using a general-purpose machine tool, a designated shape and a current position of the tool are set. It is an object of the present invention to provide a numerical control device that can know the distance of.

[0010]

In order to solve the above problems, the present invention provides a numerical controller for controlling a machine tool having at least two axes, such as a diagonal straight line and a circular arc interactively input by guidance information. A graphic storage means for storing the designated shape, a movement command means for outputting a pulse signal for instructing the movement of the tool, a current position storage means for receiving the pulse signal and storing the current position of the tool, and a current position of the tool. There is provided a numerical control device comprising: a distance calculation means for calculating a distance between a position and the designated shape and displaying the distance on a display device.

[0011]

The graphic storage means stores the specified shapes such as the diagonal straight line and the arc which are interactively input by the guidance information.
The movement command means outputs a pulse signal that commands the movement of the tool. The current position storage means receives the pulse signal from the movement command means and stores the current position of the tool. Then, the distance calculation means calculates the distance between the current position of the tool and the specified shape such as an oblique straight line and a circular arc and displays it on the display device.

Thus, the distance between the designated shape and the current position of the tool can be known in order to easily perform a simple machining of a part such as a prototype.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an outline of a numerical controller according to the present invention. The movement instructing means is means for outputting a pulse signal instructing the movement of the tool, and corresponds to the machine operation panel 40 and the manual pulse generator 41.

According to the guidance information displayed on the display device 16 via the graphic control circuit 15, the operator operates the keyboard 17 to input a designated shape such as an oblique straight line and a circular arc. The graphic storage means 1 stores the specified shape thus interactively input.

When the operator operates the current position storage means 2 to detect the pulse signal HP from the movement command means, the current position storage means 2 updates and stores the current position of the tool in accordance with the pulse signal HP. The pulse signal HP is input for each axis. When the reset signal RST for each axis is detected from the movement command means, the current position of the tool on that axis is initialized to "0".

The distance calculation means 3 calculates the distance between the specified shape stored in the graphic storage means 1 and the current position of the tool stored in the current position storage means 2. Further, the calculated result is displayed on the display device 16 via the graphic control circuit 15.

The graphic storage means 1, the current position storage means 2 and the distance calculation means 3 are executed by software as described later. FIG. 2 is a block diagram showing the hardware configuration of the numerical controller according to the present invention.

The processor 11 controls the entire numerical controller according to the system program stored in the ROM 12. The figure storage means 1, the current position storage means 2 and the distance calculation means 3 in FIG. 1 are functions of software executed by the processor 11 by the system program of the ROM 12. This ROM 12 is EPROM or EEP
ROM is used. An SRAM or the like is used as the RAM 13, and temporary data such as input / output signals is stored therein. For the non-volatile memory 14, a CMOS backed up by a battery (not shown) is used. The nonvolatile memory 14 also stores various data such as parameters and machining programs that should be retained even after the power is turned off.

The graphic control circuit 15 converts the guidance information, the input designated shape and the like into a displayable signal and gives it to the display device 16. A CRT or a liquid crystal display device is used as the display device 16. Axis control circuit 18 (3
(For the axis) receives a movement command of the axis including the interpolation pulse CP from the processor 11, and transmits the movement command of the axis to the servo amplifier 19
The output is controlled (for 3 axes). The servo amplifier 19 receives this movement command and drives a servo motor (not shown) of the machine tool 20. In addition to the servomotor, the machine tool 20 includes a machine operation panel 40 that is operated to issue a movement command, which will be described later. These components are coupled to each other by a bus 30.

A PMC (Programmable Machine Controller) 22 receives a T function signal (tool selection command) or the like via the bus 30 when executing a machining program. Then, this signal is processed by the sequence program, a signal is output as an operation command, and the machine tool 20 is controlled.
Further, the interactive numerical control device receives a status signal from the machine tool 20, performs a sequence process, and transfers a necessary input signal to the processor 11 via the bus 30.

The bus 30 is further connected with a software key 23 whose function is changed by a system program or the like. This software key 23 is used together with the display device 16 and the keyboard 17 in the CRT / MDI.
It is provided on the panel 25.

FIG. 3 is a view showing an example of the machine operation panel 40 provided in the machine tool 20. Machine control panel 4 shown
0 is a manual pulse generator 41, a selection switch 41b,
A jog feed button 42, a setting switch 42a, and a changeover switch 43 are provided.

When the handle 41a is rotated left or right, the manual pulse generator 41 generates a pulse signal according to the rotation. This pulse signal is a two-phase pulse for determining the rotation direction and is sent to the processor 11 via the bus 30 to move the tool. Selection switch 41
b indicates which direction the pulse signal generated by the manual pulse generator 41 is, the X-axis direction (X), the Y-axis direction (Y), the Z-axis direction (Z), or the direction (G) corresponding to the designated shape. This is a switch for selecting whether or not the pulse signal.

The jog feed button 42 has "+ X", "-"
"+ G", "+ Y", "-Y", "+ Z", and "-Z" axis feed buttons in the plus and minus directions and "+ G"
Eight buttons in total, which are plus and minus feed buttons, are provided corresponding to the designated shapes of "J" and "-GJ".

The setting switch 42a is a jog feed button 42.
Sets the number of pulses generated within a certain period of time when the operator presses. Specifically, the setting switch 42a inputs a pulse obtained by dividing a pulse from a crystal oscillator (not shown), and outputs the pulse at a division ratio according to the scale set by the operator.

The changeover switch 43 moves in parallel (H), which moves while maintaining the distance between the current position of the tool and the specified shape, or in the direction indicated by a normal line segment from the current position of the tool to the specified shape. The vertical movement (V) for moving back and forth is switched, and a switching signal according to the switched side is output.

Therefore, the operator can manually move the tool by setting the selection switch 41b and the changeover switch 43 to the desired movement direction and then rotating the handle 41a.
When the tool is moved by jog feed, after setting the feed speed with the setting switch 42a, the jog feed button 4
It can be performed by pressing the button in the desired movement direction out of the two.

Next, in the machine operation panel 40, when the handle 41a is rotated, or when the jog feed button 42 is used.
4 and 5 about the distance between the specified shape and the current position of the tool when "+ GJ" and "-GJ", which are the feed buttons in the plus and minus directions corresponding to the specified shape, are pressed.
Will be explained. Since the same operation is performed when the handle 41a is rotated and when the jog feed button 42 is pressed, the case where the handle 41a is rotated will be described here.

FIG. 4 is a diagram showing the distance between the tool and the specified shape. Further, FIG. 5 is a diagram showing an example of a display screen for displaying the distance in the normal direction. In FIG. 4, an oblique straight line 100 is defined as a designated shape on the XY coordinate axis plane. The diagonal straight line 100 is a graphic (designated shape) input and stored by the graphic storage means 1 shown in FIG. Further, the center of the tool 110 is currently at the point P1, that is, (X, Y) = (80,25).

First, the selection switch 41b of FIG. 3 is set in the direction (G) corresponding to the designated shape, and the changeover switch 43 is set to the "V (vertical movement)" side. And handle 4
When 1a is rotated to the left, the tool moves in the direction 110a in the direction normal to the oblique straight line 100 according to the rotation angle. When the selection switch 41b is set in the X-axis direction (X) and the handle 41a is rotated leftward, the tool moves in the direction 110b parallel to the X-axis according to the rotation angle.

In FIG. 5, a display screen 16a is a screen displayed on the display device 16 of FIG. This display screen 16
4A is a screen displayed when the tool 110 in FIG. 4 is located at the point P1, in which the current position of the tool and the stored designated shape are displayed.

At the upper left portion of the display screen 16a, the current position of the tool, that is, the center position of the tool at the point P1 is displayed for each of the X axis (X), Y axis (Y) and Z axis (Z) axes. To be done. Similarly, the distance (D) between the tool and the designated shape and the tool diameter (φ) are displayed in the upper right part of the screen. The distance (D) between the tool and the specified shape is displayed in the upper right part of this screen.
The value of the distance D1 which is the distance between the point P1 and the diagonal straight line 100 is displayed.

Further, in the lower left part of the screen of the display screen 16a,
The definition information of the diagonal straight line 100 shown in FIG.
1, Y1), end point (X2, Y2), angle (A) and tool diameter (φ) are displayed. Similarly, an oblique straight line is graphically drawn together with the definition information in the lower right part of the screen in order to visually distinguish the designated shape.

Here, when the tool in the tool 110 in FIG. 4 is moved in the direction 110a and the center of the tool is moved to a point P2, that is, (X, Y) = (65, 45),
The distance between the point P2 and the diagonal straight line 100 is the distance D2. At this time, the distance (D) between the designated shape displayed in the upper right part of the display screen 16a changes, and "11.00" is displayed.
It becomes "0".

Similarly, the tool on the tool 110 is directed 11
When the tool is moved in the direction of 0b and the center of the tool is moved to a point P3, that is, (X, Y) = (45,25), a point P3 is obtained.
And the diagonal line 100 is the distance D3. At this time, the distance (D) between the designated shape displayed in the upper right part of the display screen 16a changes and becomes "13.000".

As described above, the operator operates the machine operation panel 40.
When the tool is moved by operating, the distance (D) between the tool and the designated shape is changed and displayed according to the movement of the tool. Therefore, the distance between the designated shape and the current position of the tool can be known in order to easily perform a part of simple processing such as a prototype.

Next, the processing procedure of the present invention will be described.
FIG. 6 is a flowchart showing the processing procedure of the present invention.
This flowchart shows a processing procedure performed by the graphic storage means 1, the current position storage means 2 and the distance calculation means 3 shown in FIG. The figure storage means 1 executes step S1, the current position storage means 2 executes step S2, and the distance calculation means 3 executes other steps. In the figure, the number following S indicates a step number. [S1] The input figure is stored. Specifically, according to the guidance information displayed on the display device 16, the keyboard 17 is interactively operated to store a specified shape such as an oblique straight line and an arc input by the operator. [S2] A pulse is input. That is, the pulse signal HP and the reset signal RST from the movement command means such as the manual pulse generator 41 of FIG. 1 are detected. Also, the pulse signal H
The current position of the tool is updated according to P and the reset signal RST. [S3] The distance is calculated. Specifically, step S1
The distance between the designated shape stored in step S1 and the current position of the tool updated in step S2 (or initialized to "0") is calculated. The calculation method is the same as the method for calculating the distance between a mathematically obtained point and a straight line or a circular arc in the related art, and a description thereof will be omitted. [S4] The distance is displayed. Specifically, the display screen 16a as shown in FIG. 5 is displayed on the display device 16 via the graphic control circuit 15. [S5] It is determined whether or not an end command is input. Specifically, it is determined whether or not an end instruction has been input from the movement instruction means or the keyboard 17. If the end command is input (YES), this processing procedure is ended, and if the end command is not input (NO), the process returns to step S2.

In this way, after the operator inputs the specified shape by the guidance information and operates the machine operation panel 40, the distance between the specified shape and the current position of the tool can be known. Can be easily realized.

In the above description, the milling machine is assumed, but the same can be applied to a lathe or the like. Further, such a guidance function can be incorporated in a normal numerical control device, or can be configured as a special inexpensive numerical control device.

[0040]

As described above, in the present invention, the figure storage means stores the designated shape, the current position storage means receives the pulse signal from the movement command means and stores the current position of the tool, and the distance calculation means. Calculates the distance between the tool's current position and the specified shape and displays it on the display device, so the distance between the specified shape and the tool's current position can be known, making it easy to perform some simple machining such as prototypes. Become.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a numerical controller according to the present invention.

FIG. 2 is a block diagram showing a hardware configuration of a numerical controller according to the present invention.

FIG. 3 is a diagram showing an example of a machine control panel.

FIG. 4 is a diagram showing a distance between a tool and a designated shape.

FIG. 5 is a diagram showing an example of a display screen displaying a normal direction distance.

FIG. 6 is a diagram showing a processing procedure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Graphic storage means 2 Current position storage means 3 Distance calculation means 15 Graphic control circuit 16 Display device 17 Keyboard 20 Machine tool 40 Machine operation panel 41 Manual pulse generator

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location G05B 19/405 M 9064-3H 19/415 S 9064-3H (72) Inventor Shuji Matsuura Minamitsuru Yamanashi Prefecture Oshino-mura, Gunma 3580 Kobaba, Fanab Co., Ltd. (72) Inventor, Koji Yamamuro 3580, Kobaba, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture Fanak Co., Ltd.

Claims (2)

[Claims] 1. A numerical control device for controlling a machine tool having at least two axes, a graphic storage means for storing a specified shape such as an oblique straight line and a circular arc interactively input by guidance information, and a command for moving a tool. Movement command means for outputting a pulse signal to perform, current position storage means for receiving the pulse signal and storing the current position of the tool, and calculating and displaying a distance between the current position of the tool and the specified shape A numerical control device comprising: a distance calculation unit that is displayed on the device. 2. The numerical controller according to claim 1, wherein the distance calculation means has a tool diameter correction means for correcting a tool diameter when calculating the normal direction distance.