JPH07160317A - Tool path plotting method - Google Patents

Abstract

PURPOSE:To easily know the feed speed of a tool by selecting the display attribute of a movement track according to a tool moving speed commanded with NC data and plotting the path. CONSTITUTION:In a tool path plotting process by an interactive numerical control unit wherein NC data for machining are already stored in a nonvolatile memory 34 and the tool path of machining is plotted, a processor 31 which has detected a display attribute corresponding to the parameter set value of a noncutting feed speed after setting the display attribute in a display attribute storage register for noncutting feed reads the parameter set value of a cutting feed speed out of a nonvolatile memory 14 and temporarily stores it in a command speed storage register. A similar process is repeated for the parameter set value of the cutting feed speed and then a display attribute corresponding to the parameter set value of the cutting feed speed is detected to set the display attribute corresponding to the parameter set value in a display attribute storage register for cutting feed. Then the tool path is plotted with the display attribute (color, etc.) corresponding to the tool moving speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a tool trajectory drawing method.

[0002]

2. Description of the Related Art A tool locus drawing method is known in which a tool moving locus is divided into non-cutting feed and cutting feed and drawn by dotted lines and solid lines. However, in the conventional tool path drawing method, only one of the dotted line and the solid line is selected and drawn according to whether the movement command is the non-cutting feed or the cutting feed. Even if the cutting feed or the setting value of the speed parameter related to the cutting feed is changed, this cannot be known from the display screen. In the case of cutting feed, the cutting feed speed may be changed variously in the machining program according to the difference in cutting conditions such as rough cutting and finishing. I can't know.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to easily know the feed rate of the tool set in the section by the tool movement trajectory on the graphic display. It is to provide a tool trajectory drawing method that can be performed.

[0004]

The present invention has achieved the above object by a configuration in which the display attribute of a movement path is selected and drawn according to the tool movement speed instructed by NC data.

In the tool locus drawing method as one embodiment, this object is achieved by drawing the tool movement locus in a color according to the tool feed speed.

[0006]

By selecting the display attribute of the movement trajectory according to the tool feed speed instructed by the NC data and drawing it on the graphic display, the tool feed speed set in the section is visually confirmed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of an interactive numerical control device having an automatic programming function.

The processor 11 controls the entire interactive numerical controller according to the system program stored in the ROM 12. ROM12 has EPROM or EEPR
OM is used. SRAM 13 is used as the RAM 13, and various data or input / output signals are stored therein. A CMOS backed up by a battery (not shown) is used for the non-volatile memory 14, and various data once stored are retained as they are 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. As the graphic display in the display device 16, a CRT or a liquid crystal display device is used. Display device 1
6 is when creating a machining program interactively,
Display the shape and processing conditions.

The keyboard 17 is composed of shape element keys, numerical keys and the like, and necessary graphic data and the like 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.
In addition, after receiving a status signal from the machine tool 20 and performing a sequence process, the processor 11 is connected via the bus 21.
Transfer the required input signal to.

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

To the bus 21, in addition to the processor 11 which is the CPU for NC, a processor 31 for interaction having a bus 30 is connected. 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, information relating to the NC sentence, for example, the overall movement trajectory of the tool is 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 stored in the machine tool 20.
It is also executed when processing by, and the foreground animation is displayed.

FIG. 4 shows the outline of the tool trajectory drawing process in the interactive numerical control apparatus of this embodiment in the case of foreground animation display, that is, the NC data already created by the interactive numerical control apparatus is read one after another. The processing of the processor 31 in the case of drawing a tool locus by using the drawing is shown as an example. In the case of the background animation display, after the processes of steps S1 to S6 are once performed, the data such as the shape and the processing conditions required for creating the NC sentence are input in an interactive format and the translation into the NC data is performed. Every time one block of NC data is created, the process from step S7 is repeatedly executed, but the entire process content itself is substantially the same as that shown in FIG.

NC using this type of interactive numerical control device
The data generation process, that is, the process for translating the input data such as the shape and the processing conditions and converting the input data into the NC data is already known, and therefore the description thereof is omitted. Here, an example of lathe processing is taken. A brief description will be given of the correspondence relationship between the tool movement trajectory and the feed rate based on the generated NC data.

In FIG. 2, the workpiece is rotated about the Z axis by designating the cutting position by designating the coordinate position in the coordinate system composed of the Z axis corresponding to the rotation axis of the workpiece and the X axis orthogonal to the Z axis. It is an example of a tool locus in the case of processing a stepped taper shape on the outer periphery of a cylindrical work. In this example, by inputting the final finishing shape and the cutting area to the interactive numerical control device, its automatic programming function makes it possible to perform rough operations such as stacking of rectangles formed by broken lines and dashed lines in the figure. A chain double-dashed line in the figure that moves the tool along the final finish shape leaving a certain finishing allowance between the tool trajectory for machining (the tool trajectory partially indicated by circled numbers) and the final finish shape. Tool path for semi-finishing (tool path between T-U) as shown in, and for finishing as shown by the thin solid line in the figure that moves the tool along the final finish shape. Tool locus (tool locus between QR) is automatically generated, and NC data of cutting feed rate for each machining process and non-cutting feed rate for tool positioning and withdrawal are automatically input when interactive data is input. Setting conditions It is automatically generated based on the current value or the like of the system parameters.

The machining operation shown in FIG. 2 will be briefly described. First, the tool starts from point P, which is the initial point, in the X-axis and Z-axis finishing allowances (U /
2, W) escape and retreat to point S (the operation of the broken line),
The tool is rushed along the X axis by the amount of one cut R (the operation indicated by the broken line), and the cutting is performed along the Z axis (the operation indicated by the alternate long and short dash line). Then, when it reaches a point in front of the final finished shape by the amount of finishing allowance in the Z-axis direction, it is retracted in the X-axis direction by the cutting amount R (the operation indicated by the chain line).
Returning to the S point along the Z-axis (the operation of the broken line),
In addition to the cut shown by the broken line from the position of point S,
, And so on are repeatedly executed to perform rough cutting up to the point T. Then, when the point reaches T, X
Performs mid-finishing up to point U along the tool locus indicated by the two-dot chain line that has escaped by the finishing allowance in the axial and Z-axis directions.
After that, it returns to the point P, moves to the point Q, moves to the point R along the final finish shape, and performs the final finishing.
Among these, the tool locus shown by the broken line is a non-cutting feed in which the tool does not come into direct contact with the work, and the feed speed given by the NC data is also large. In addition, in order to prevent shaving and inadvertent biting of the cutting edge caused by heat generation of the work, rough cutting (dashed line operation)> semi-finishing (dashed line operation)> finishing (solid line operation) In order, the cutting feed rate of the tool is gradually reduced.

Hereinafter, the NC data for machining as shown in FIG. 2 is already stored in the non-volatile memory 34, and the tool trajectory of this machining is drawn by drawing the tool trajectory of this machining. The drawing process will be described.

Processor 3 that started the tool trajectory drawing process
First, the parameter setting value Vj of the non-cutting feed speed for positioning and retracting is read from the nonvolatile memory 14 and temporarily stored in the command speed storage register V (step S1), and the subroutine 1 shown in steps a1 to a4 is executed. Is performed to search the range of the speed to which the parameter setting value Vj of the non-cutting feed speed belongs in the display attribute storage file that is preset and stored in the non-volatile memory 34, and the display attribute corresponding to this is searched. Ask (Step S
2).

In the example of the display attribute storage file shown in FIG. 3, when the command speed V is the set value V0 or less, the attribute C0, for example, the green tool locus is made to correspond. Attribute C1 in the speed range of <V ≦ V1
(Brown tool locus), attribute C2 (yellow tool locus) in the speed range of V1 <V ≦ V2, attribute C3 (purple tool locus), speed of V3 <V in the speed range of V2 <V ≦ V3 Attribute C4 (red tool locus) corresponds to the range.

Therefore, the processor 31 which has started the processing of the subroutine first initializes the value of the speed range search index k to 0 (step a1), and then the value of the speed range search index k is stored in the display attribute storage file. Whether the upper limit value of the set speed range exceeds 3 (step a2), or the upper limit value Vk of the set speed range having a speed equal to or higher than the command speed V
Is detected (step a3), the value of the speed range search index k is sequentially incremented (step a3).
4). If the determination result of step a3 is true, it means that the speed range including the command speed V is detected within the range of k ≦ 3. In this case, the attribute corresponding to the speed range is C.
k, that is, one of C0, C1, C2, and C3.
When the determination result of step a2 is true, it means that the command speed V is larger than the maximum value V3 of the upper limit value of the set speed range having the subscript number 3, and in this case, the speed range The corresponding attribute is Ck, ie C4.

After detecting the display attribute Ck corresponding to the parameter setting value Vj of the non-cutting feed speed in this way, the processor 31 sets the display attribute Ck in the non-cutting feed display attribute storage register Cj (step S3). Furthermore, the parameter setting value Vc of the cutting feed speed is stored in the nonvolatile memory 1
4 and temporarily store in the command speed storage register V (step S4), and the parameter setting value V of the cutting feed speed is read.
The display attribute Ck corresponding to the parameter setting value Vc of the cutting feed rate is detected by repeatedly performing the same processing as that of step S2 for c (step S
5) The display attribute Ck corresponding to the parameter setting value Vc is set in the cutting feed display attribute storage register Cc (step S6).

Next, the processor 31 reads one block of NC data stored in the non-volatile memory 34 (step S7), and determines whether this block indicates a program end (step S8). If it does not indicate the program end, the processor 31
Is whether the book belongs to any of the cutting feed command, non-cut feed command, and feed speed command,
Alternatively, it is determined whether the command is another command (steps S9 to S11).

When the determination result of step S9 is true and the one block of NC data read this time is confirmed to be the cutting feed command, the processor 31 stores the cutting feed display attribute storage register Cc. A tool locus corresponding to the cutting feed command for the one block is drawn on the graphic display of the display device 16 based on the display attributes currently stored (step S12), and step S12 is performed.
7 and the next NC from the non-volatile memory 34.
Read one block of data.

If the determination result of step S9 becomes false while the determination result of step S10 becomes true and it is confirmed that the NC data of one block read this time is the non-cut feed command, the processor Numeral 31 draws a tool path corresponding to the non-cutting feed command for the one block on the graphic display of the display device 16 based on the display attributes currently stored in the non-cutting feed display attribute storage register Cj. (Step S13), the process proceeds to step S7 to read one block of the next NC data from the non-volatile memory 34.

Further, step S9 and step S10
If the determination result of step S11 is true and the NC data of one block read this time is the feed speed command, the processor 31 determines that the block Is temporarily stored in the command speed storage register V (step S14), and the above-mentioned steps S2 and S5 are performed for the newly commanded cutting feed speed value Vp.
The display attribute Ck corresponding to the newly commanded value Vp of the cutting feed speed is detected by executing the same processing as in (step S15), and the cutting feed display attribute storage register Cc is updated and set (step S15). S16), step S
7 and the next NC from the non-volatile memory 34.
Read one block of data.

The display attribute set in the cutting feed display attribute storage register Cc in the processing of steps S4 to S6, that is, the display attribute corresponding to the cutting feed speed preset in the system by the NC data is newly added. A new feed rate command is valid as a display attribute for cutting feed until it is redefined, and a display attribute for cutting feed that is once redefined is valid until another feed rate command is redefined. is there.

Further, when the determination results of steps S9, S10 and S11 are all false, it means that the read NC data is neither a feed command nor a feed speed command. After the processing corresponding to the block command is performed in the same manner as the conventional one (step S17), the process proceeds to step S7 to read the next NC data of one block from the nonvolatile memory 34.

Thereafter, the processor 31 sequentially reads the NC data one block at a time until the block indicating the program end is detected in the process of step S8, and repeatedly executes the same process as described above to determine the tool feed speed. Draw the tool locus with the display attribute according to it.

N for the tool path as shown in FIG.
When the above-mentioned processing is performed on the C data, the feed speed command is issued every time the NC trajectory data for the tool trajectory for rough cutting, the tool trajectory for semi-finishing and the tool trajectory for finishing is read. Since the value Vp of the cutting feed rate is redefined by, the cutting feed rate for each machining process is drawn with different attributes. For example, in a section with a high feed rate such as a tool trajectory for positioning or retracting the tool, red with a display attribute C4 (corresponding to the broken line in FIG. 2) corresponding to the fastest speed range, a tool trajectory for rough machining Is a yellow attribute of the display attribute C2 corresponding to a relatively high speed range (corresponding to the alternate long and short dash line in FIG. 2), and a tool path for semi-finishing machining is a brown attribute of the display attribute C1 corresponding to a slower speed range (FIG. 2). Of the display attribute C0 corresponding to the slowest speed range.
Is displayed as green (corresponding to the solid line in FIG. 2) on the display screen.

In the above-mentioned embodiment, the description has been made on the case where the color of the tool path is changed and drawn in accordance with the feed speed of the tool, but the line type is changed in correspondence with the feed speed such as a broken line, a solid line, and an alternate long and short dash line. The drawing may be changed, or the luminance of the locus and the width of the locus may be changed. Further, not only is the attribute used for drawing the tool path changed according to the feed speed of the tool, but the first attribute corresponding to the type of movement such as non-cutting feed or cutting feed, for example, the line type is determined in advance. Further, the second attribute, for example, the color of the tool locus or the like may be changed and displayed according to the feed speed.

[0035]

According to the tool trajectory drawing method of the present invention, N
Since the tool locus is drawn with the display attribute according to the tool movement speed instructed by the C data, the tool feed speed can be easily known only by visually observing the tool movement locus on the graphic display.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing the configuration of an interactive numerical control device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an example of a tool path.

FIG. 3 is a conceptual diagram showing a display attribute storage file provided in the interactive numerical control device according to the embodiment.

FIG. 4 is a flowchart showing an outline of a tool locus drawing process in the interactive numerical control apparatus according to the embodiment.

[Explanation of symbols]

 14 non-volatile memory 15 graphic control circuit 16 display device 31 processor 34 non-volatile memory

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Narita Takagi 3580 Konoba, Oshinomura, Minamitsuru-gun, Yamanashi Prefecture FANUC Co., Ltd. Local FANUC Co., Ltd.

Claims (2)

[Claims] 1. A tool locus drawing method for drawing a movement locus of a tool on a graphic display based on NC data, wherein a display attribute of the movement locus is selected according to a tool feed speed instructed by the NC data. Tool path drawing method that draws with. 2. The tool trajectory drawing method according to claim 1, wherein the display attribute is color.