JPH0612115A - Cutting area determining system - Google Patents

Abstract

PURPOSE:To prepare the NC data in the recessed part of a proper work at every tool, regarding a cutting area determination system. CONSTITUTION:A material shape and a parts shape are defined (S1). Then, the decision condition whether the recessed part of a work at every tool is possible to be cut or not is set to tool data (S2). If the decision condition showing that cutting is available is set (steps S5, S7), the recessed part of the work is determined as a cutting area (step S6, S8). Based on this determination, the NC data in the cutting area are automatically prepared (S10). Therefore, since a working is performed for the only proper cutting area at every tool, the working shape forming a desired shape can be obtained without the burdern of the tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting area determining method, and more particularly to a cutting area determining method for automatically determining a cutting area by an interactive numerical controller or an automatic programming device.

[0002]

2. Description of the Related Art Conventionally, in an interactive numerical control device or an automatic programming device, when a workpiece has a recess such as a pocket or an overhang, the recess has a parameter as to whether or not the recess can be cut. Had set. Then, when the NC data is generated, it is determined by referring to the parameter whether or not the concave portion of the work defined by the shape of the part is used as the cutting region.

[0003]

However, since the parameters are uniformly determined by the parameters, it is determined whether or not the concave portion is to be the cutting region regardless of the tool to be used. Therefore, depending on the tool used, it is unsuitable for cutting recesses such as pockets or overhangs, and there is a problem that the tool is burdened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cutting area determining method for creating NC data of a concave portion of a work suitable for each tool.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a concave portion of a work can be cut in a cutting area determination method in which a cutting area is automatically determined by an interactive numerical control device or an automatic programming device. A cutting area is characterized in that a judgment condition of whether or not the tool is set is determined for each tool, whether or not the concave portion is set as a cutting area is determined according to the judgment condition, and NC data for each of the tools is automatically created. A decision method is provided.

[0006]

First, the operator sets, in the tool data, a determination condition indicating whether or not the concave portion of the work can be cut for each tool. Then, if the determination condition indicating that cutting is possible is set, the concave portion of the work defined as the part shape is determined as the cutting region. Based on this determination, NC data of the cutting area is automatically created.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of an interactive numerical control device for carrying out 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 such as tool data or input / output signals are stored therein. The non-volatile memory 14 uses a CMOS backed up by a battery (not shown), and stores parameters, pitch error correction amount, tool correction amount, and the like that should be retained even after the power is turned off.

The graphic control circuit 15 converts the digital signal into a signal for display and gives it to the display device 16. A CRT or a liquid crystal display device is used as the display device 16. The display device 16 displays a shape, processing conditions, etc. when creating a processing program in an interactive form.

The keyboard 17 is composed of symbolic keys, numerical keys, etc., and necessary graphic data and NC data are input using these keys. The axis control circuit 18 receives the axis movement command from the processor 11 and outputs the axis command to the servo amplifier 19. The servo amplifier 19 receives the movement command and drives the servo motor of the machine tool 20. These components are coupled to each other by a bus 21.

A PMC (Programmable Machine Controller) 22 receives a T function signal (tool selection command) or the like via the bus 21 when executing an NC 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, it 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 21.

Further, on the bus 21, software keys 23, N whose functions are changed by a system program or the like.
A serial interface 24 for sending C data to an external device such as a floppy disk, a printer, or a paper tape reader (PTR) is connected. The software key 23 is provided on the CRT / MDI panel 25 together with the display device 16 and the keyboard 17.

In addition to the processor 11 which is the CPU for NC, the bus 21 is connected with a processor 31 for interaction having a bus 30. ROM 32 on the bus 30,
The RAM 33 and the non-volatile memory 34 are connected.

The interactive data input screen displayed on the display device 16 is stored in the ROM 32. On this interactive data input screen, the entire motion trajectory of the tool and the like are displayed as a background animation when the NC sentence is created. Further, the work or data that can be set by the input screen is displayed on the display device 16 in a menu format. The item to be selected from the menu is selected by the software key 23 arranged at the bottom of the screen corresponding to the menu. The meaning of the software key 23 changes for each screen. An SRAM or the like is used as the RAM 33, and various data for dialogue are stored therein.

The input data is the processor 3 for dialogue.
1 to process a workpiece machining program. The created program data is sequentially background-animated on the display device 16 used interactively. Further, the work machining program stored as the NC sentence in the non-volatile memory 34 is the machine tool 2
It is also executed during the machining simulation of 0, and the foreground animation is displayed.

FIG. 3 is a view showing the material shape and the part shape of the work. First, the operator uses the keyboard 1 shown in FIG.
The material shape and the part shape of the work are input and defined using the shape element keys and the like provided in 7. In the drawing, the workpiece 100 and the workpiece 10 which are the material shapes input in this way are shown.
A component shape 110 that is a processed shape after processing 0 is shown. The part shape 110 has a pocket portion 20.
1 and the overhang unit 202 are defined.

For the part shape 110, the operator first specifies arbitrary points P1 and P2 on the part shape 110 in order to set a cutting region to be machined. Next, the operator gives an area designation 111 indicating the area direction from the point P1 and an area designation 112 indicating the area direction from the point P2, and then issues an NC data creation command. The system is this NC
When receiving a command to create data, NC is used for each tool used.
Create the data.

FIG. 4 is a diagram showing an example of a tool data setting screen. In the figure, a display screen 16a is one of the screens displayed on the display device 16 of FIG. Display screen 1
A soft key 230, which is a command key for the operator to command the CNC, is displayed at the bottom of the screen of 6a.

The soft key 230 is a CRT / MD shown in FIG.
It corresponds to a command key that is commanded by pressing the software key 23 provided in the I panel 25, and is composed of ten commandable keys that change according to the processing content. As the soft keys 230, an upward movement command key 231 for instructing the upward movement of the cursor 16b, a downward movement instruction key 232 for instructing the downward movement of the cursor 16b, and a command for displaying the tool data on the previous page. A previous page command key 233, a next page command key 234 for commanding display of tool data on the next page, and an end command key 235 for commanding end of tool data setting are displayed.

It is necessary to set predetermined items in the tool data. Therefore, on the display screen 16a of FIG. 3, the tool identification number, cutting edge angle, cutting edge angle, protection angle, and pocket cutting and overhang cutting as the determination conditions are displayed as an example of the predetermined items. There is. Note that the cutting edge angle, the cutting edge angle, and the protection angle represent the angles indicated by graphic figures on the right side of the screen, respectively.

Each of these items has an upper movement command key 231.
Alternatively, the cursor 16b is moved by the down movement command key 232, and an appropriate numerical value is input from the keyboard 17 shown in FIG. As the determination condition, for example, "1" is set when the pocket portion can be cut, and "0" is set when the pocket portion cannot be cut. Similarly, "1" is set when the overhang portion can be cut, and "0" is set when the overhang portion is not cut.

In the figure, "100" is shown as the tool identification number.
However, the cutting edge angle is "5" (degrees) and the cutting edge angle is "6".
"0" (degree) indicates that "3" (degree) is set as the protection angle. In addition, "1" is set for cutting the pocket portion and "0" is set for cutting the overhang portion. Therefore, as will be described later, when machining is performed using the tool shown in the tool data of FIG. 3, the pocket portion defined as the part shape is determined as the cutting area, and the overhang portion is not determined as the cutting area. The tool data set in this way is stored in the RAM 13 or the non-volatile memory 14 of FIG.

When displaying tool data other than the tool data displayed on the display screen 16a, desired tool data is displayed by the previous page command key 233 or the next page command key 234 as necessary. be able to. Further, when the setting of the tool data is ended, the end command key 235 may be used.

Next, the determination of the cutting area after the tool data is set will be described. FIG. 5 is a diagram showing a cutting area determined by the cutting area determination method of the present invention. The same elements as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

In the figure, a cutting area 300 is an area determined based on the part shape 110 and the area designations 111 and 112 of FIG. Further, when it is determined based on the tool data set in FIG. 3, the pocket portion 201 is determined to be the cutting region, and the overhang portion 20 is determined.
For 2, it is determined not to be a cutting area. That is, the pocket cutting region 301, which is a region in which the pocket portion 201 is processed, is determined to be included in the cutting region 300.

Therefore, in the machining based on the NC data created by the above-mentioned cutting region 300, the machining is performed only on the proper cutting region for each tool, so that the tool is not burdened and the desired shape is formed. The shape can be obtained. Therefore, the tool life can be extended.

FIG. 1 is a flow chart showing the processing procedure of the cutting area determining method of the present invention. This flowchart is realized by the processor 11 executing the system program stored in the ROM 12 of FIG. In the figure, the number following S indicates a step number.

[S1] The materials and parts are set. That is, the work 100 and the part shape 110 as the material shape shown in FIG. 3 are input from the keyboard 17 of FIG.

[S2] Tool data is input. That is, the tool data shown in FIG. 4 is input and edited. The input tool data is stored in the RAM 13 or the non-volatile memory 14 shown in FIG.

[S3] The cutting conditions are input. Specifically, the amount of clearance when cutting, the amount of cut,
Set the spindle speed and feed rate. [S4] The cutting area is designated. That is, the basic areas to be cut, such as the cutting area 300 shown in FIG. 5, are specified by the area designations 111 and 112 performed in FIG.

[S5] It is determined whether or not the pocket portion is cut. Specifically, it is determined whether the pocket cutting PK is "1". If the pocket part cutting PK is "1" (cutting is possible; YES), the process proceeds to step S6, and if it is "0" (cutting is not possible; NO), the process proceeds to step S6.

[S6] The pocket portion is removed. That is, the pocket cutting area is removed from the cutting area designated in step S4. By this removal, the pocket portion is not processed.

[S7] It is determined whether or not the overhang portion is cut. Specifically, it is determined whether or not the overhang portion cutting OH is "1". If overhang cutting O
If H is "1" (cutting is possible; YES), the process proceeds to step S8, and if "0" (cutting is not possible; NO), the process proceeds to step S9.

[S8] The overhang portion is removed. That is, the overhang cutting area is removed from the cutting area designated in step S4. By this removal, the overhang portion is not processed.

[S9] It is determined whether or not there is another unprocessed area. If there is an unprocessed area (YES), the process returns to step S2, and if there is no unprocessed area (NO), the process proceeds to step S10.

[S10] NC data is created. Specifically, NC data is created for the cutting area determined in steps S4, S6, and S8. Therefore,
If the judgment condition indicating that cutting is possible is set, the concave portion of the work defined as the part shape is determined as the cutting area, and the NC data is automatically created.
NC data suitable for a tool can be created.

In the above description, the present invention is applied to the interactive numerical control device, but it can be applied to an automatic programming device as well. Also, display screen 1
Although the movement of the cursor 16b on the 6a is performed by the software keys 231, 232, other input means,
For example, a command key called an "icon" displayed graphically on the display screen 16a may be input by using a pointing device such as a mouse to give a command.

Further, although the cutting area is determined when the concave portion of the work is the pocket portion or the overhang portion, the same can be applied to the concave portion of another work such as a T-shaped groove. .

[0039]

As described above, according to the present invention, the condition for judging whether or not the concave portion of the workpiece can be cut is set in the tool data for each tool, and if the condition for cutting is set. Decide the concave part of the work as the cutting area and NC
Since the data is automatically created, NC data suitable for the tool can be created.

Further, in the machining based on the NC data thus created, machining is performed only for an appropriate cutting area for each tool, so that the tool is not burdened, highly accurate machining is possible, and the tool life is extended. be able to.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing procedure of a cutting area determination method of the present invention.

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

FIG. 3 is a diagram showing a material shape and a component shape of a work.

FIG. 4 is a diagram showing an example of a tool data setting screen.

FIG. 5 is a diagram showing a cutting area determined by a cutting area determination method of the present invention.

[Explanation of symbols]

 11, 31 processor 12, 32 ROM 13, 33 RAM 14, 34 non-volatile memory 15 graphic control circuit 16 display device 17 keyboard 23 software key 25 CRT / MDI panel

Claims (2)

[Claims] 1. In a cutting area determination method in which a cutting area is automatically determined by an interactive numerical control device or an automatic programming device, a condition for determining whether or not a concave portion of a work can be cut is set for each tool, and the determination is performed. A cutting area determination method, which determines whether or not the concave portion is to be a cutting area according to a condition, and automatically creates NC data for each tool. 2. The cutting area determining method according to claim 1, wherein the concave portion is a pocket portion or an overhang portion.