JPH0228703A - Numeric controller - Google Patents

Abstract

PURPOSE:To facilitate usage by visually displaying the present position of a tool. CONSTITUTION:The position detector 6 of an encoder and the like detects the moving quantity of at least one direction among the X-axis, Y-axis and Z-axis of the tool 3 installed on an NC machine tool 1. An NC program execution part 22 consisting of a micro processor integrates the detected shifting quantity of the tool 3 at every moment and operates the difference of the objective value of the tool to be shifted and the present position, namely, the residual shifting quantity of the tool. An NC data graphic signal conversion part 24 consisting of the micro processor, a video plotter and the like converts the objective value of the tool 3, a whole distance to be shifted, and the rate of the residual shifting quantity with respect to the whole distance into video signals. The converted video signals and the content of the program in the middle of execution are visually displayed on a display device 50 consisting of a CRT display device and the like by a graph and a character.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a numerical control device.

[Prior art] Numerical control devices, for example NC machine tools, etc.
It is automatically operated by the program. Generally, creating an NC program requires skill, and even programs created by skilled programmers must undergo actual operation tests to prevent interference between the workpiece and the tool.

As a reliable and quick programming method, an automatic progeramink device or an NC device with an interactive automatic programming function (hereinafter referred to as an interactive NC device) that can perform graphic simulation on a CRT screen is used. In an NC device that performs two-dimensional operations such as a lathe, it is possible to almost certainly check the operation using graphic simulation. However, in a machining center that mainly performs three-dimensional operations, the operations are complex and many tools are used, so it is difficult to perform a sufficient check using graphic simulation. Furthermore, if the correspondence between the tool and the offset number is incorrect or the offset amount is incorrectly set, interference between the workpiece and the tool will occur.

Therefore, in order to make it easier to perform a program check on the actual machine, for example, as described in Japanese Patent Laid-Open No. 60-14159, it is necessary to check whether the tool is approaching the target position or moving away from the target position. CR
What is displayed on the T screen or JP-A-61-22
As described in Japanese Patent No. 0004, it has been proposed to divide the CRT screen into two, display a command program on one of the two divided screens, and display offset data, etc. on the other.

FIG. 10 shows a CRT display device for a conventional NC machine tool. In the figure, a CRT screen 100 includes a program display section 52 that displays commands of the program being executed, workpiece coordinate values that display the position of the cutting edge of the tool as current position information,
It is composed of an NC data display section 51 that displays the remaining movement amount of one step statement of the program.

The operator advances the program step by step and checks the work without looking at this screen. In the remaining movement amount display area, the remaining movement amount for each step of the program is displayed, and the operator checks the value while comparing the value displayed on the CRT with the actual tool position.

The current tool position is at Z = 50 in the workpiece coordinate system, and when ZO is executed with a program command, the remaining movement amount is Z
= -50,000, and the tool moves to the workpiece coordinate Z-0. When it reaches Z-0, the remaining movement amount becomes O.

[Problems to be Solved by the Invention] Since the conventional numerical control device is configured as described above, even if the currently running program is displayed on the CRT screen, it is not possible to display it in a specific programming language. Therefore, if the operator does not understand the contents of the program, it will not only be meaningless to the operator, but also, even if the current tool position is displayed numerically on the CRT screen, the displayed value will change from moment to moment. Because of the changes, it is difficult to visually detect them, and it is actually very difficult to deal with emergency situations such as tool interference.

This invention was made to solve the above-mentioned problems, and it visually displays the current tool position so that it can be easily handled even if the operator does not understand the programming language etc. The purpose is to provide a numerical control device that can

[Means for Solving the Problems] A numerical control device according to a first invention includes: a tool movement amount detection means for detecting the movement amount of a tool in at least one direction of the Y axis, the Y axis, and the Z axis; a remaining movement amount calculation means for calculating the difference between the current tool position and a target value to which the tool should move, that is, the remaining movement amount of the tool, from the amount of tool movement detected by the detection means; and a target value to which the tool should move; a graphic signal converting means for converting into a predetermined video signal for graphically displaying the total stroke to be moved by the tool and the ratio of the remaining travel amount to the total stroke to be moved by the tool; and the contents of the program currently being executed and the tool. display means for visually displaying the current position of the tool, the coordinates of the target value to be moved, the total travel of the tool converted by the graphic signal conversion means, and the ratio of the remaining travel distance to the total travel of the tool. are doing.

A numerical control device according to a second invention includes a tool movement amount detection means for detecting the movement amount of the tool in at least one direction of the Y-axis, the Y-axis, and the Z-axis; and a tool movement detected by the tool movement amount detection means. remaining movement amount calculation means for calculating the difference between the current tool position and a target value to which the tool should move, that is, the remaining movement amount of the tool; a graphic signal converting means for converting into a predetermined video signal in order to graphically display the ratio of the amount of remaining movement to the total stroke to be moved; and tool information such as tool type and tool diameter, NC program and dialogue part program. a storage means for storing information, an input means for inputting specifications such as tools, machining methods, tool movement target values, etc. during execution of the dialogue part program; and input means for inputting specifications such as tools, machining methods, and tool movement target values, etc., and information on the type of tool and machining currently being used or specified by the input means. A motion determining means for determining the method and type of program command, and converting the tool type, work method, and program command type determined by the motion determining means into characters, figures, symbols, or symbols consisting of combinations thereof. The content of the program currently being executed, the current position of the tool and the coordinates of the target value to be moved, the total stroke to be moved by the tool converted by the graphic signal conversion means, and the total distance to be moved by the tool. The present invention includes display means for visually displaying the ratio of the remaining movement amount to the stroke, the type of tool, the machining method, and the type of program command converted by the symbol signal conversion means.

[Operation] In the first invention, the tool movement amount detection means is, for example, a numerical control device, for example, N
A position detection means such as an encoder installed on a C machine tool, which detects the amount of movement of a tool installed on an NC machine tool in at least one of the Y-axis, Y-axis (horizontal direction), and Z-axis direction (vertical direction). To detect.

The remaining movement amount calculation means is, for example, a microprocessor, and integrates the momentary tool movement amount detected by the tool movement amount detection means, and calculates the difference between the current tool position and the target value at which the tool should be moved, that is, the tool. Calculate the remaining movement amount.

The graphic signal conversion means is, for example, a microprocessor, a video plotter, etc., and displays on a CRT screen the target value for which the tool should move, the total stroke that the tool should move, and the ratio of the remaining amount of movement to the total stroke that the tool should move. into a predetermined video signal for graphical display.

The display means is, for example, a CRT display device, a liquid crystal display device, etc., and displays the content of the program currently being executed, the current position of the tool, and the coordinates of the target value to be moved as text information, and also displays the tool converted into a video signal. The target value to be moved, the total stroke to be moved by the tool, and the ratio of the remaining movement amount to the total stroke to be moved by the tool are visually displayed as a graph.

The second invention has the following effects in addition to the effects of the first invention. That is, the storage means is, for example, a C-MOS memory or a baffle memory, and stores tool information such as the type of tool used in the NC machine tool, tool diameter, etc., the NC program, and the dialogue part program.

The input means is, for example, an input device such as a keyboard, and the tool information and the like may be input from this input device during the dialogue part program, but may also be input already at the time of programming.

The operation determining means is, for example, a microprocessor, and determines the currently used tool, the currently executed machining method, and the type of program command.

The symbol signal conversion means includes, for example, a microprocessor and an A/D converter, and converts the types of tools, work methods, and program commands determined by the operation determination means into characters, figures, symbols, or symbols consisting of combinations thereof. do.

The display means visually displays the symbol converted by the symbol signal conversion means, similar to the operation of the first invention.

[Example] Fig. 1, Fig. 2, Fig. 3, Fig. 4 (A), (B), and () show a first embodiment of the numerical control device according to the first invention.
This will be explained using C).

FIG. 1 is a diagram showing the configuration of a numerical control device according to the first invention. In the figure, the NC machine tool 1 has at least Z
A spindle head 2 movable along the axis, a tool 3 provided on the spindle head 2, and a position detector 6, such as an encoder, which acts as a tool movement amount detection means for detecting the amount of movement of the spindle head 2 or the tool 3. and the tool or spindle head 2
A workpiece (workpiece) 4 is fixed on a table 7.

The control unit 10 converts the current output of the position detector 6 into the immediately preceding NC.
A movement amount detection section 20 detects the difference by comparing the output of the position detector 6 at a step of the program, and a signal from the movement amount detection section 20 is used in a predetermined numerical control (hereinafter abbreviated as NC) program. an NC data conversion unit 21 that converts the NC data into NC data; an NC program storage unit 23, for example a RAM, that stores the NC program, the target value to which the tool should be moved, the total stroke to be moved, etc.;
The NC program execution unit 22, which is composed of a CPU, for example, acts as a remaining movement amount calculation means by executing the NC program, and the ratio of the remaining movement amount to the total stroke of the tool calculated by the NC program execution unit 22 is displayed graphically. It is provided with an NC data graphics converter 24 that functions as a graphic signal converter, for example, a video plotter, for converting into a predetermined video signal for display.

The display device 5o that acts as a display means is, for example, a CR7 display device or a liquid crystal display device, and includes an NC data display section 51 that displays the coordinates of the tool tip converted by the NC data conversion section 21 as text information. , an NC program display section 52 that displays several steps before and after the current step of the NC program being executed, and a graph displaying the ratio of the remaining movement distance to the total stroke of the tool converted by the NC data graphic conversion section 24. It consists of a graphic display section 53.

FIG. 2 shows the relationship between the machine coordinate system, the workpiece coordinate system, the remaining movement of the tool, and the current position of the tool cutting edge.

The machine coordinate system is a coordinate system with the origin (coordinate 0) at an arbitrary position specific to the NC machine tool, and the highest point of the main spindle on the Z-axis (that is, vertical direction) is the origin return point (hereinafter referred to as ZRN).
), and the downward direction of the tool is negative.

The workpiece coordinate system is a coordinate system in which the reference plane of the workpiece is set to Z-0, and the command values in the program are excluded.

The remaining amount of tool movement indicates the remaining amount of movement after subtracting the current tool position from the target value at which the tool should ultimately move for each step of the program, and is displayed on each axis side.

For example, in Figure 2, the tool length (tool offset)
I = 200mm, the difference between the origin of the machine coordinate system and the origin of the workpiece coordinate system (work offset) is m = 500
Let it be mm. At this point, the tip of the tool is 300 mm above the reference plane of the workpiece.

For example, run the following program here.

1st step: G90 GOOG54 XOYO 2nd
Step: G43 HI Z50゜3rd step:
GOl 20 F200 Here, the tool length old=200.000 is set as the tool offset, and the distance G54-Z-500,000 from the origin of the machine coordinate system to the work reference point is set as the work offset.

First, by executing the first step of the program, a workpiece coordinate system for cutting the workpiece is determined.

Next, perform the second step. Set the tool tip to Z50.0
If the tool is lowered until it reaches 00, that is, the tool is lowered by 250 mm in the Z-axis direction, the remaining amount of tool movement is Z
=-250,000.

At this time, on the screen of the display device 50, in the work coordinate system, Z
= 50.000 and remaining movement amount Z = -50,000 are displayed.

Furthermore, a third step is executed. Lower the tool tip until it reaches Z=0. That is, when the tip of the tool reaches the workpiece reference surface, the remaining amount of tool movement becomes Z-0, and the program moves to the next program step.

The display of the work coordinate system displays the coordinate position with the work reference point as 0, and the remaining travel amount displays the distance until positioning or interpolation is completed, and at the completion point, the travel amount for the next program command is displayed. .

FIG. 3 shows an example of a display on the screen 100 of the display device 50.

The screen 100 of the display device 50 includes an NC program display section 52 that displays the contents of the program being executed, and an NC data display section 51 that displays NC data such as the coordinates of the current tip of the tool as characters and numerical values. It consists of a graphic display section 53 that graphically displays the ratio of the remaining movement amount to the total travel of the tool converted by the NO data graphic conversion section 24.

Furthermore, at the bottom of the screen 100 there is a program check,
A function setting key 54 is provided for selecting and specifying various auxiliary functions such as tool setting.

In the graphic display section 53, W is the workpiece coordinate system Z
It represents the current position (or cumulative amount of movement) of the tool tip for the entire stroke that the tool should move with reference to O, and ■ represents the remaining amount of movement of the tool. The scale in the graphic display section 53 can be arbitrarily changed by specifying the display on the screen using a well-known input means such as a keyboard or a charge storage type CRT display device.

The graph display in this graphic display section 53 is
Similar to the remaining movement amount display on the data display section 51 and the digital display of the workpiece coordinate system, it changes in real time in synchronization with the movement of the tool 3 (or spindle head 2).

FIGS. 4(C), 4(B) and 4(C) show the display state of the graphic display section 53 of the display device 50 when the above-described program is executed.

FIG. 4(A) shows the state when the first step of the program is executed. In the first step, the workpiece coordinate system has only been set and the tool has not yet moved, so the W scale does not display anything. The ■ scale indicating the remaining amount of tool movement indicates that the tool should be moved to Z=50 in the next step.

FIG. 4(B) shows the state when the second step of the program is executed. In the second step, the tool z=
Move up to 50. The W scale shows that the tool has moved to Z=50. ■The scale indicates that it should be moved to Z=0 in the next step.

FIG. 4(C) shows the state when the third step of the program is executed. In the third step, the tool moves to Z20. The W scale indicates that the tool has moved to Z=0. (2) The scale indicates that the tool has reached the target position, that is, the remaining amount of movement is 0.

In the above embodiment, if a color CRT device is used as the display device 50, the W scale, I scale, etc. can be displayed using different colors, and the display can be more easily understood by the operator. be.

For example, GOO (first-step delivery) is displayed in red, GOI (first-order delivery)
can also be blue.

Next, a numerical control device according to the second invention will be explained using FIGS. 5, 6, 7, 8, and 9 showing one embodiment. Note that elements with the same numbers as those in the embodiment of the first invention are the same.

In the numerical control device according to the second invention in FIG. 5, the control unit 10 compares the current output of the position detector 6 with the output of the position detector 6 at the immediately previous step of the NC program, and calculates the difference. A movement amount detection section 20 that detects the movement amount, an NC data conversion section 21 that converts the signal from the movement amount detection section 20 into NC data used in a predetermined NC program,
For example, RAM (C-MOS) stores tool information such as tool type, tool diameter, NC program, dialogue part program, target value for which the tool should move, and total strokes to be moved.
memory, bubble memory, etc.), and an NC
A calculation section 30 consisting of, for example, a CPU that executes a program and acts as a remaining movement amount calculation means, a machine control section 26 and a shaft for controlling the spindle head 2 and motor 5 based on the results calculated in the calculation section 30. A control unit 25;
An NC data graphic conversion unit that functions as a graphic signal conversion unit comprising, for example, a video plotter, which converts the ratio of the remaining amount of movement of the tool to the total stroke to be moved calculated in the calculation unit 30 into a predetermined video signal for displaying graphically. 24, an input section 32 consisting of a keyboard, etc., which acts as an input means, and a type of tool, based on a signal from the spindle head control section 8 or a signal input by the input section 32, which acts as an operation determination means.
A control data symbol conversion means 33 is provided for converting the type of instruction of the work method or program into characters, figures, symbols, or symbols consisting of combinations thereof.

The display device 50 that acts as a display means is, for example, a CRT display device or a liquid crystal display device, and includes an NC data display section 51 that displays the coordinates of the tool tip converted by the NC data conversion section 21 as text information; The NC program 20- display section 52 displays several steps before and after the current step of the NC program being executed, and the graph shows the ratio of the remaining movement distance to the total stroke of the tool converted by the NC data graphic conversion section 24. It consists of a graphic display section 53 for displaying, and a symbol display section 55 for displaying symbols converted by the control data symbol conversion section 33.

Unlike the energization NC program, the dialogue part program includes all tool information such as tool type and tool diameter, and is displayed on the symbol display section 55 of the display device 50. Figure 6 shows the display device 5 during execution of the dialogue part program.
The state of the screen 100 of 0 is shown.

In comparison with the embodiment shown in FIG. 3, an M code indicating commands for tools and programs is displayed on the symbol display section 55. The rest of the configuration is the same as that shown in FIG. 3, so the explanation will be omitted.

FIG. 7 shows examples of symbols indicating the types of tools.

Tools include - center drill, drill, tap, reamer, polling, chamfering, end mill, pole end mill, face mill, shell cutter, side cutter, T-slot, angular cutter, back bore, back counterbore, etc. (Fig. 5).

Further, FIG. 8 illustrates symbols indicating program commands (M codes) for controlling the NC machine tool. As M codes, optional stop, program stop, program end, spindle normal rotation, spindle reverse rotation, spindle stop, tool exchange, etc. are similarly stored in the storage unit 31.

Optional stop (Mol), program stop (M
OO), program end (M2O), etc., an optional stop (Mol) is set to warn the operator.
It is effective to blink yellow when the program is stopped (MOO) and blink blue when the program is finished (M2O).

FIG. 9 shows a screen 100 of the display device 50 at the end of the program.
This shows the display.

[Effects of the Invention] As described above, the numerical control device according to the first invention graphically displays the current position of the tool, and the numerical control device according to the second invention graphically displays the current position of the tool, Since the type of tool, type of program command, etc. are displayed as symbols, accidents such as tool interference can be easily dealt with.
Furthermore, even if an operator is not familiar with NC programs, the numerical control device can be easily used.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the numerical control device according to the first invention, FIG. 2 is a diagram showing the positional relationship between the machine coordinate system, the workpiece coordinate system, the remaining travel amount of the tool, and the tool cutting edge; FIG. 3 is a diagram showing the display on the screen of the display device in the first invention, FIGS. 4(A), (B) and (C) are diagrams showing the display state of the graphic display section of the display device, and FIG. is the second
A diagram showing the configuration of an embodiment of a numerical control device according to the invention of
6 is a diagram showing the display on the screen of the display device in the second invention, FIG. 7 is a diagram illustrating symbols indicating types of tools, FIG. 8 is a diagram illustrating program instructions, and FIG.
The figure shows the display on the screen of the display device when the program ends, and FIG. 10 shows the display device of a conventional numerical control device. l...NC machine tool 2...Spindle head 3...Tool 4
...Work 5..Motor 6..Displacement detector 7..Table 8..Spindle head control unit Applicant Mori Seiki Co., Ltd. Agent Patent attorney Masamichi Matsu1) 〉 〉

Claims (2)

[Claims] (1) A tool movement amount detection means for detecting the amount of movement of the tool in at least one direction of the X-axis, Y-axis, and Z-axis, and the current tool position and the tool from the amount of tool movement detected by the tool movement amount detection means. a remaining movement amount calculation means for calculating the difference between the target value of the tool and the remaining movement amount of the tool; A graphic signal converting means converts the movement amount ratio into a predetermined video signal to graphically display the contents of the program currently being executed, the current position of the tool, and the coordinates of the target value to be moved, the graphic signal converting means A numerical control device comprising: a display means for visually displaying the converted total stroke of the tool and the ratio of the remaining travel distance to the total stroke of the tool. (2) A tool movement amount detection means for detecting the amount of movement of the tool in at least one direction of the X-axis, Y-axis, and Z-axis, and the current tool position and the tool from the amount of tool movement detected by the tool movement amount detection means. a remaining movement amount calculation means for calculating the difference between the target value of the tool and the remaining movement amount of the tool; Graphic signal converting means for converting into a predetermined video signal for graphically displaying the proportion of each movement amount, a storage means for storing tool information such as tool type and tool diameter, an NC program and a dialogue part program, and predetermined information. an input means for inputting the information, an operation determination means for determining the type of tool currently used or specified by the input means, a machining method, and a type of program command; the type of tool determined by the operation determination means; work method,
Symbol signal conversion means that converts the type of program command into characters, figures, symbols, or symbols consisting of combinations of these, and the contents of the program currently being executed, the current position of the tool, the coordinates of the target value to be moved, and graphics. The total stroke of the tool converted by the signal conversion means, the ratio of the remaining movement amount to the total stroke of the tool, the type of tool, the machining method, and the type of program command converted by the symbol signal conversion means. A numerical control device characterized by comprising display means for visually displaying the information.