JPH06222821A - Numerical controller - Google Patents

Abstract

PURPOSE:To automatically set a movement inhibited area for each tool instructed by a machining program in a numerical controller containing a machine tool. CONSTITUTION:A storage means 1 stores a tool number table 1a, a correction number table 1b, the standard inhibited range data 1c, and the movement inhibited range data 1d. A correction value setting means 2 receives the input data instructed by an operator and sets both tables 1b and 1c to the means 1. A movable range setting means 3 receives a machining program and sets the data 1d to the means 1 according to the data 1c and the table 1a as long as a prescribed range setting command is received. At the same time, the means 3 checks the stroke and outputs an interpolation signal CS. An interpolation means 4 receives the signal CS from the means 3 and outputs an interpolation pulse CP.

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 receiving a machining program and controlling the operation of a machine tool, and more particularly to a numerical control device having a stroke check function.

[0002]

2. Description of the Related Art In a conventional numerical control device equipped with a machine tool, a stroke check function is widely used as a method for checking the movable range of a tool or the like. This stroke check function is a function to immediately activate an alarm or the like and stop the operation of the tool when the tool is erroneously entered in the tool movement prohibited range preset in the parameters or the like.

Thus, for example, the main body of a machine tool,
By setting the area outside the table where cutting is performed as the movable prohibited range, the tool can be prevented from being damaged by the stroke check function.

In recent years, since machine tools are equipped with automatic tool changers and the like, there is a tendency to use a plurality of tools in one product processing, for example, one tool is used for each processing step. It is in.

[0005]

However, when a product is machined using a plurality of tools, even if the movable prohibited range is set, the tool length and the tool diameter are different for each tool used. Depending on the tool used, it will be in the prohibited range,
There is a problem in that it is not possible to strictly prevent damage to the tool.

Further, in the stroke check function, for example, a tool movable prohibited range may be set in a parameter or the like, but in order to change this during machining, it is necessary to incorporate a corresponding setting command into the machining program. There is a problem that the program creation becomes complicated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a numerical control device for automatically setting a movable prohibited range for each tool instructed by a machining program.

[0008]

According to the present invention, in order to solve the above problems, in a numerical control device for receiving a machining program and controlling the operation of a machine tool, the correspondence between a function number such as a tool number and a correction number. Function number table showing the relationship,
A memory for storing a correction number table showing a correspondence relationship between the correction number and the offset value, reference prohibited range data showing a reference region for prohibiting movement of tools and the like, and movement prohibited range data showing a movement prohibited region for each tool. Means, receiving the input data instructed by the operator, receiving the correction value table and the correction value setting means for setting the reference prohibited range data in the storage means, and receiving the machining program,
When a predetermined range setting command is issued, the movable range setting data is set in the storage means based on the reference prohibited range data and the function number table, and a stroke range is checked to output an interpolation signal. There is provided a numerical control device comprising: a means and an interpolation means for receiving the interpolation signal and outputting an interpolation pulse.

[0009]

In the storage means, a function number table showing the correspondence between the function numbers such as tool numbers and the correction numbers, a correction number table showing the correspondence between the correction numbers and the offset values,
The reference prohibition range data indicating the reference area in which the movement of the tool or the like is prohibited and the movement prohibition range data indicating the area in which the movement is prohibited are stored for each tool.

First, the correction value setting means receives the input data instructed by the operator, and sets the correction number table and the reference prohibited range data in the storage means. When the movable range setting means receives a machining program and a predetermined range setting command is issued, the movable range setting data is set in the storage means based on the reference prohibited range data and the function number table, and a stroke check is performed. And output an interpolation signal. The interpolation means receives the interpolation signal, outputs an interpolation pulse, and controls the operation of the servomotor built in the machine tool to control the movement of the tool or the like.

In this way, the optimum prohibited range is automatically set for each tool, so that damage to the tool or the like can be strictly prevented.

[0012]

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 illustrating the principle of the present invention and a diagram illustrating an embodiment. The numerical control device of the present invention comprises storage means 1, correction value setting means 2, movable range setting means 3 and interpolation means 4.

In the storage means 1, a function number table 1a showing a correspondence relationship between a function number such as a tool number and a correction number, a correction number table 1b showing a correspondence relationship between the correction number and an offset value, and movement of a tool etc. The reference prohibition range data 1c indicating the reference area in which the movement is prohibited and the movable prohibition range data 1d indicating the area in which the movement is prohibited for each tool are stored. In addition,
The movable prohibited range data 1d includes inner movable prohibited range data in which the inside of the rectangular area is the prohibited area or outer movable prohibited range data in which the outside of the rectangular area is the prohibited area. Also,
A tool length offset value, a tool radius offset value, and the like are set as the offset values in the correction number table 1b.

The correction value setting means 2 receives the input data instructed by the operator and sets the correction number table 1b and the reference prohibited range data 1c in the storage means 1.
The movable range setting means 3 receives the machining program, and when a predetermined range setting command is issued, the reference prohibited range data 1
Based on c and the function number table 1a, the movable range data 1d is set in the storage means 1 and the stroke check is performed to output the interpolation signal CS. The movable range setting means 3 receives the tool function (hereinafter, referred to as “T function”) or the preparation function (hereinafter, referred to as “M function”) of the NC function and determines the moving direction vector of the tool or the like. The corresponding movable prohibited range data 1d is set.

The interpolating means 4 receives the interpolating signal CS output from the movable range setting means 3, outputs an interpolating pulse CP, and controls the operation of a servomotor built in the machine tool, so that the tool etc. Control movement.

Next, the hardware configuration of the numerical controller for implementing the present invention will be described. FIG. 2 is a block diagram showing the overall configuration of an interactive numerical control device which is one of the numerical control devices embodying the present invention.

The processor 11 controls the entire numerical controller according to the system program stored in the ROM 12. EPROM or EEPROM is used for the ROM 12. An SRAM or the like is used as the RAM 13, and various data or input / output signals are stored therein. The non-volatile memory 14 corresponds to the above-mentioned storage means 1, uses a CMOS backed up by a battery (not shown), and has a function number table 1a to be held even after the power is turned off.
A correction number table 1b, reference prohibited range data 1c, movable prohibited range data 1d, a machining program, a macro, etc. are stored.

The correction value setting means 2, the movable range setting means 3 and the interpolation means 4 shown in FIG. 1 are functions realized by the processor 11 executing one of the above system programs.

The graphic control circuit 21 converts the digital signal into a signal for display and gives it to the display device 22. A CRT or a liquid crystal display device is used as the display device 22. The display device 22 displays the shape, processing conditions, etc. when creating a processing program in an interactive manner. The digital signal sent to the graphic control circuit 21 is a signal sent by the processor 11 executing the screen display processing program stored in the ROM 12 with respect to the processing program stored in the non-volatile memory 14. The keyboard 23 is composed of cursor keys, shape element keys, numerical keys and the like, and the necessary graphic data and processing data are input using these keys. The software key 24 is a key whose function is changed by a system program or the like. These graphic control circuit 21, display device 22, keyboard 23 and software key 24
CRT / MDI panel 20.

The input screen of the interactive data displayed on the display device 22 is stored in the ROM 12. On this interactive data input screen, the entire motion trajectory of the tool is displayed as a background animation when the machining program is created. In addition, the display device 22
Contains the work or data that can be set on the input screen.
Displayed in menu format. Which item in the menu is selected is selected by the software key 24 arranged at the bottom of the screen corresponding to the menu. The meaning of the software key 24 changes for each screen. Various kinds of data for dialogue are stored in the RAM 13 or the non-volatile memory 14.

The axis control circuit 15 receives the axis movement command from the processor 11 and outputs the axis command to the servo amplifier 16. The servo amplifier 16 receives the command of this axis and drives the servo motor provided in the machine tool 30.

A PMC (Programmable Machine Controller) 18 receives a T function signal (tool selection command) and the like when executing a machining program. Then, this signal is processed by the sequence program and an operation command is output as a signal to control the operation of the machine tool 30. Further, it receives a status signal from the machine tool 30, performs a sequence process, and transfers a necessary input signal to the processor 11.

The above-mentioned components are the servo amplifier 16
And the display device 22 are all coupled to the bus 19. In the above configuration, the input data is processed by the processor 11 to create a machining program. The created program data is sequentially background-animated on the display device 22 used interactively. The machining program stored as the machining program in the non-volatile memory 14 is also executed during the machining simulation of the machine tool 30,
Foreground animation is displayed.

FIG. 3 is a schematic view for explaining the movable range.
In the figure, a tool 101 is held by a chuck 100. Generally, the center of the chuck 100 is the reference position SP.
Therefore, the reference surface of the machine tool becomes the reference surface SS.

At this time, the reference position SP and the reference surface SS
The range between and is called the movable range MA. In addition, the reference position SP
And a tip of the tool 101 have a Z-axis offset value (tool length offset value) OFSz, and a movable range MC between the tip of the tool 101 and the reference plane SS. Further, the correction value vector data 1 cc described later is the tool 101.
Is the direction vector V (-) when it moves downward in the drawing, and conversely, it is the direction vector V (+) when it moves upward in the drawing although not shown. Hereinafter, description will be given based on these definitions.

Next, the operation of the numerical controller according to the present invention will be described with reference to FIGS. In addition, for simplification of description, it is assumed that the predetermined range setting command is the T function of the NC function.

FIG. 4 is a diagram showing an example of the parameter setting screen. In the figure, a display screen 22a is one of the screens displayed on the display device 22 shown in FIG. 2, and is a parameter setting screen displayed by the operator performing a predetermined operation.

On the display screen 22a, a standard prohibited range table 1ca for setting a standard prohibited range, prohibited area data 1cb for setting inside and outside of the prohibited area, and FIG.
The correction value vector data 1cc indicating the moving direction of the tool 101 shown in FIG. 2 and the function number table 1aa indicating the correspondence between the tool number and the correction number are displayed.

In the reference prohibited range table 1ca, the maximum value shown in the middle column and the minimum value shown in the right column are set for each of the X-axis, Y-axis and Z-axis shown in the left column. Such data settings are
Generally, this is done using the numeric keys and cursor keys provided on the keyboard. The surface of the rectangular parallelepiped whose diagonal is the line segment connecting the maximum value coordinate data and the minimum value coordinate data set in this way becomes the boundary of the reference prohibited range.

Further, in the prohibited area data 1cb, the area to be the prohibited area is inside the rectangular parallelepiped surface set in the reference prohibited area table 1ca.

Set to [0] or outside [1]. For example, inside

When set to [0], the inside of the rectangular parallelepiped becomes the reference prohibited range, and when set to outside [1], the outside of the rectangular parallelepiped becomes the reference prohibited range.

Further, the correction value vector data 1cc indicates that the moving direction of the tool 101 is downward.

Set to [0] or upward [1]. For example, downward

If it is set to [0], it becomes the direction vector V (-), and if it is set to [1] in the upward direction, it becomes the direction vector V (+).

Then, the tool number shown in the left column and the correction number shown in the right column are set in the function number table 1aa.
For example, in line 101, the correction number “03” is set corresponding to the tool number “01”. It should be noted that the left column is not limited to the tool number, and a number corresponding to a predetermined range setting command instructed by the machining program may be set, such as an auxiliary number corresponding to the M function of the NC function.

FIG. 5 is a view showing an example of the correction value setting screen. In the figure, a display screen 22b is one of the screens displayed on the display device 22 shown in FIG. 2, and is a correction value setting screen displayed by the operator performing a predetermined operation.

On the display screen 22b, a correction number table 1ba showing the correspondence between the correction number and the offset value is displayed. The correction numbers shown in the left column, the tool length offset values shown in the middle column, and the tool radius offset values shown in the right column are set in the correction number table 1ba. For example, in line 201, “155” is set in the tool length offset value and “50” is set in the tool radius offset value, corresponding to the correction number “03”.

FIG. 6 is a diagram showing a calculation method for setting the movable prohibition range. In FIG. 6A, the case of the inner movable prohibition range is shown in the calculation table 3a, and in FIG. The cases of the prohibited range are shown in the calculation table 3b.
It should be noted that the maximum movement prohibition value Pnb and the minimum movement prohibition value Pns correspond to the movement prohibition range data 1d shown in FIG. Similarly,
The reference prohibition maximum value Psb and the reference prohibition minimum value Pss correspond to the reference prohibition range data 1c, and the offset data V corresponds to the tool length offset value and the tool radius offset value in the correction number table 1b.

The procedure for determining the arithmetic expression is as follows.
That is, first, one of the calculation tables 3a and 3b is selected according to the prohibited area data 1cb set on the parameter setting screen shown in FIG. For example, in FIG. 4, since the outside [1] is set as the prohibited area data 1cb, the calculation table 3b for the outside movable prohibited range is selected.

Next, with respect to the selected operation table, that is, the operation table 3b, the prohibited area data 1cb is set.
Similarly, the calculation formula is determined according to the correction value vector data 1cc set on the parameter setting screen shown in FIG. For example, in FIG. 4, downward correction value vector data 1cc is used.

[0], that is, since the direction vector V (-) is set, the arithmetic expression shown in line 301 is determined and the arithmetic operation is performed. That is, the following equation (1) is calculated at the maximum value.

Pnb = Psb (1) Similarly, the following equation (2) is calculated at the minimum value. Pns = Pss + V (2) In the offset data V, the tool length offset value is the Z axis data, and the tool radius offset value is the X axis and the Y axis.
Calculated as axis data.

For example, when "T1" is commanded in the machining program, it means that the tool number "01" has been commanded, so the correction number "03" is obtained from the 101st line of the function number table 1aa shown in FIG. From the 101st row of the correction number table 1ba shown in FIG. 5, the offset value, that is, the tool length offset value “155” and the tool radius offset value “5” are set.
0 "is obtained. Therefore, when the above formulas (1) and (2) are calculated based on the reference prohibited range table 1ca shown in FIG. 4, Pnb = (+ 3000, +3000, +3000) and Pns =
(-2950, -2950, -2845).

The outside of the rectangular parallelepiped whose diagonal line is the line segment connecting the maximum movement prohibition value Pnb shown in equation (1) and the minimum movement prohibition value Pns shown in equation (2) is the movement prohibition range. On the contrary, the inside of this rectangular parallelepiped is the movable range MC (only the Z axis is shown) shown in FIG.

FIG. 7 is a flowchart showing the processing procedure of the movable range setting means 3. In the figure, the number following S indicates a step number. [S1] It is determined whether the command of the machining program is a predetermined range setting command. Specifically, it is determined whether the T function or the M function is commanded. If the T function is instructed (YES), the process proceeds to step S2, and if other function commands (NO), the process proceeds to step S4. [S2] Based on the T function instructed in step S1,
Function number table 1a stored in nonvolatile RAM 14
The correction number corresponding to the T function is obtained from. Then, based on this correction number, the offset value is obtained from the correction number table 1b. For example, when "T1" is instructed in the machining program, it means that the tool number "01" is instructed. Therefore, 101 in the function number table 1aa shown in FIG.
The correction number "03" can be obtained from the line. Similarly,
Based on this correction number "03", the offset value, that is, the tool length offset value "155" and the tool radius offset value "50" can be obtained from the 101st row of the correction number table 1ba shown in FIG. [S3] Offset value obtained in step S2, reference prohibited range table 1ca and prohibited area data 1c shown in FIG.
The movable prohibited range data 1d is set based on b and the correction value vector data 1cc. That is, first, according to the prohibited area data 1cb, the calculation tables 3a and 3 shown in FIG.
Select one of the calculation tables in b. After that, with respect to the selected calculation table, a calculation formula is determined according to the correction value vector data 1cc, and the movable prohibition range data 1d is calculated based on the data set in the reference prohibition range table 1ca according to the calculation formula. [S4] A stroke check is performed based on the set prohibited movement range data 1d. If it is within the range regulated by the movable prohibited range data 1d, the interpolation signal CS is not output, and if not, the interpolation signal CS is output.

In this way, since the optimum movable prohibited range data 1d is automatically set for each tool and the stroke is checked, it is possible to strictly prevent the damage of the tool and the like.

In the above description, the present invention is applied to a milling machine, but it can be applied to a lathe and the like as well. Further, the movable range setting means 3 is configured to set the movable prohibited range data 1d in response to the T function of the NC function.
The movable prohibited range data 1d may be set by receiving the M function of the NC function or a specific character string called "metacharacter". By doing so, it is possible for the operator to give an instruction with a character string or the like that is easy to understand.

Further, in the reference prohibited range data 1c and the movable prohibited range data 1d, a rectangular parallelepiped surface having a diagonal line connecting the maximum and minimum coordinate values is set as a boundary. You may set other surfaces, such as a spherical surface, as a boundary. Further, the reference prohibited range data 1c and the movable prohibited range data 1d are composed of three-axis data.
It may be composed of axis data.

Although the tool length offset value and the tool radius offset value in the correction number table 1b are applied as the offset data V, the tool 101 is not limited to this.
Any offset value for prohibiting the movement of the above may be applied.

[0046]

As described above, in the present invention, the function number table, the correction number table, the reference prohibition range data and the movable prohibition range data are stored in the storage means, and the correction value setting means receives the input data and the correction number. The table and the reference prohibition range data are set, and when the movable range setting means issues a predetermined range setting command, the movable prohibition range data is set, the interpolation signal is output, and the interpolation means outputs the interpolation pulse. Therefore, the optimum prohibited range can be automatically set for each tool, and the damage of the tool or the like can be strictly prevented.

Further, since it is not necessary to separately incorporate a command for setting the movement prohibited range data into the machining program, the machining program can be easily created, and the conventionally created machining program can be applied.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing an overall configuration of an interactive numerical control device.

FIG. 3 is a schematic diagram illustrating a movable range.

FIG. 4 is a diagram showing an example of a correction value setting screen.

FIG. 5 is a diagram showing an example of a parameter setting screen.

FIG. 6 is a diagram showing a calculation method for setting a movable prohibited range, wherein FIG.
(B) shows the case of the outer movable prohibited range, respectively.

FIG. 7 is a flowchart showing a processing procedure of a movable range setting means.

[Explanation of symbols]

11 Processor 12 ROM 13 RAM 14 Nonvolatile Memory 15 Axis Control Circuit 16 Servo Amplifier 18 PMC (Programmable Machine Controller) 20 CRT / MDI Panel 21 Graphic Control Circuit 22 Display Device 23 Keyboard 24 Software Key 30 Machine Tool

Claims (5)

[Claims] 1. A numerical controller for controlling the operation of a machine tool in response to a machining program, in which a function number table showing a correspondence between a function number such as a tool number and a correction number, the correction number and an offset value. A storage means for storing a correction number table indicating the correspondence, a reference prohibition range data indicating a reference area for prohibiting movement of tools, and a movement prohibition range data indicating a movement prohibition area for each tool, and an instruction from the operator. A correction value setting means for receiving the input data and setting the correction number table and the reference prohibition range data in the storage means, and a reference range prohibition data when a predetermined range setting command is given in response to a processing program. And based on the function number table, the movement prohibited range data is set in the storage means, and the stroke check is performed. A numerical control device comprising: a movable range setting means for performing an output of an interpolation signal, and an interpolation means for receiving the interpolation signal and outputting an interpolation pulse. 2. The numerical controller according to claim 1, wherein the movable range setting means is configured to set the movable range data in correspondence with a moving direction vector of the tool or the like. 3. The movable range setting means is configured to set the movable range data by using a tool function (T function) or a preparation function (M function) of an NC function as the predetermined range setting command. The numerical controller according to claim 1, which is characterized in that. 4. The movable prohibited range data stored in the storage means includes inner movable prohibited range data in which the inside of the rectangular region is a prohibited region or outer movable prohibited range data in which the outside of the rectangular region is a prohibited region. The numerical control device according to claim 1, wherein the numerical control device is configured as described above. 5. The numerical controller according to claim 1, wherein the offset value in the correction number table stored in the storage means is tool length correction data or tool diameter correction data.