JPH08263115A - Interference evading method for nc machine tool - Google Patents

Abstract

PURPOSE: To reduce a state wherein a machine enters an alarm state and stops operating while improving the safety by evading interference between operation parts of the NC machine tool. CONSTITUTION: While the NC machine tool is in operation, future tracks of plural operation parts in shapes that are previously set in an NC device are found (step 1) and an interference area where the future tracks of the operation parts cross each other to overlap is set (step 2). The priority of entries into the interference area is confirmed before the respective operation parts move in the interference area to make an operation part move in when it has top priority or stop before entering the interference area when there is another operation part with higher priority; and the operation part is allowed to move in the interference area when having top priority after the operation part having the higher priority exits from the interference area to eliminate interference (steps 3-7).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for avoiding interference between operating parts such as a moving tool rest in an NC machine tool such as an NC (numerical control) lathe.

[0002]

2. Description of the Related Art In recent years, NC machine tools such as NC lathes, machining centers (MCs) and NC milling machines have been used for machining various parts. These NC machine tools control the operation of each operation part such as the spindle and the tool post by performing a machining program that is read into the NC device during operation, or by executing a machining program that is read or created in advance and stored. Can be done automatically.

For example, in the NC lathe, the NC device rotates the spindle and moves the spindle in the direction of the center line (Z direction) according to a machining program, and in the X and Y directions of the tool rest (in a plane orthogonal to the Z direction). A machine tool that controls the movement in two directions (orthogonal to each other) or in the Z direction, and uses a tool (blade) attached to a tool post to perform machining such as cutting or drilling on the material (workpiece) held on the spindle. is there.

[0004] Further, there are demands for higher processing speed of such NC machine tools, more complicated processing steps, higher processing accuracy, and expansion of functions (general versatility). Therefore, a single machine tool is provided with a large number of axes and moving parts such as a moving tool rest, and the working parts interfere with each other during operation, damaging the tool (cutting tool) or making the work defective. There is a fear. Therefore, there is also a system in which interference between these operating unit and fixed unit or between operating units is checked, and an alarm is generated immediately before actual interference to stop the operation or to perform an interference avoiding operation. Further, there is a machine which stops the operation of the machine when an object which is preset in the NC device and which is operating at the highest speed is present within a distance where it can be stopped, which causes an alarm state to avoid interference.

[0005]

However, if the NC machine tool stops in the alarm state as described above,
Since the program cannot be continued and the machining has to be restarted from the beginning if the machining is in progress, there is a problem that the working efficiency is significantly reduced and the machining material is wasted. In addition, there is a problem that an extra program and useless time are required to enable the interference avoiding operation.

The present invention has been made in order to solve such a problem, and avoids interference between operating parts such as a movable tool rest in an NC machine tool to improve safety and raises an alarm state. It is an object of the present invention to prevent the machine from stopping its operation so much that the work efficiency is not deteriorated, and unnecessary programs and unnecessary time are unnecessary.

[0007]

SUMMARY OF THE INVENTION The present invention provides an NC machine tool having a plurality of moving parts which may interfere with each other.
In order to achieve the above object, the following interference avoidance method is provided. That is, during operation of the NC machine tool, future trajectories of the shapes of the plurality of motion parts that are set in the NC device in advance are obtained, and interference regions where future trajectories of the plurality of motion parts intersect and overlap with each other are determined. Set.

[0008] Then, before each of the operation units enters the interference area, the priority order of entering the interference area is confirmed,
If the operation unit has the highest priority, the operation unit is entered, and if there is another operation unit with a higher priority, the operation unit is stopped before entering the interference region, and the operation unit having the higher priority is set to the interference region. It goes out and does not interfere, and it enters the interference area only when the priority becomes highest.

When the above-mentioned interference area is set during the operation of the NC machine tool, a plurality of blocks of the machining program being used by the NC device are prefetched to obtain future trajectories of the plurality of operating parts, and the future of the plurality of operating parts is determined. It is advisable to set the interference areas where the trajectories of (1) and (2) overlap each other as a surface in the two-dimensional interference check and a solid in the three-dimensional interference check. Further, the above-mentioned priority order may be set in advance in the NC device. However, if the priority order is not set in advance, the priority order is set in the order in which a plurality of operating units reach the interference area earlier in time. Alternatively, it is preferable to set a higher priority to an operating unit that is being processed than an operating unit that is not being processed.

[0010]

According to the method for avoiding interference in the NC machine tool according to the present invention, an interference area where future trajectories intersect and overlap with a plurality of moving parts which may interfere with each other during the operation of the NC machine tool. When the respective operation units enter the interference area, the operation units are entered in the order of higher priority, and the operation unit with the lower priority goes out of the interference area and interferes with the operation unit with the higher priority. Since the process waits until it disappears, it is possible to continue the execution of the machining program while avoiding the interference between the operating parts. Therefore, it is extremely unlikely that the machine will stop operating in an alarm state, and safety can be improved without lowering work efficiency. Moreover, an extra program and a wasteful time for performing the interference avoiding operation are unnecessary.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 2 is an external perspective view of an essential part showing an example of an NC lathe for carrying out the interference avoidance method according to the present invention.

[0012] This is a perspective view of the vicinity of the machining position of a headstock sliding NC lathe for machining a bar material, which is provided with a pair of spindles and a back spindle. That is, as shown in FIG. 2, a headstock (not shown) is provided along a guide rail (not shown) in the Z1 axis direction (Z1 direction indicated by an arrow) parallel to the centerline of the main spindle on the rear portion of the upper surface inclined toward the front. The first headstock is reciprocally moved in the Z1 direction indicated by an arrow by a Z1 axis servomotor (not shown) via a feed screw mechanism.

A tool rest base 11 is fixed to the bed 10 and stands upright in the width direction thereof in front of a main spindle that is rotatably supported by the main spindle and is rotated by a spindle motor for the main spindle. A guide bush 14 is arranged on the tool rest base 11 at a position concentric with the center line of the main spindle, and the work gripped by the main spindle projects from the guide bush 14 to the machining position and extends in the Z1 axis direction. Is slidably guided and held by.

A tool rest 14 is further arranged on the tool rest base 11 via an XY table 13 so as to be slidable in the X1 axis and Y1 axis directions (arrows X1 and Y1 directions) orthogonal to the Z1 axis and orthogonal to each other. It is set up. The XY table 13 is provided with an X1-axis servo motor, a Y1-axis servo motor, and a feed screw mechanism, which are not shown, by which the tool rest 14 is predetermined in the arrow X1 direction and the arrow Y1 direction, respectively. The stroke can be reciprocated.

A plurality of (five in the illustrated example) cutting tools 15 and a plurality of (three in the illustrated example) rotary tools 16 are provided on the tool rest 14 in parallel in the X1 axis direction. They are attached in a comb-teeth shape at predetermined intervals in the Y1 axis direction. Further, the rear tool post 1 is provided on the front side of the tool post base 11.
7 are fixed, and a plurality of back surface processing tools 18 (five in the illustrated example) 18 for back surface processing are arranged parallel to the Z1 axis direction at a predetermined interval in the X1 axis direction. It is installed in. The tool 18 is, for example, a relative rotary tool such as a drill or an end mill. Although the tool 18 does not rotate, it can be machined by rotating a workpiece chucked on a back spindle described later.

On the front side of the tool rest base 11 of the bed 10, a rear headstock 20 is provided slidably in the Z2 axis direction parallel to the Z1 axis and in the X2 axis direction (parallel to the X1 axis) orthogonal thereto. The back spindle 20 is provided with a back spindle facing the above-mentioned spindle and an opposed tool post 22 adjacent to the back spindle. A plurality of (three in the illustrated example) relative rotary tools 23 such as drills and end mills are fixedly mounted on the opposed tool post 22 so as to be aligned in parallel in the Z2 axis direction at predetermined intervals. ing.

The rear headstock 20 can be reciprocally moved by a predetermined stroke by the Z2 axis servomotor and the X2 axis servomotor in the arrow Z2 direction and the arrow X2 direction via the feed screw mechanism. The back spindle is provided with a chuck 21 for gripping a work piece at its tip, and is rotated by a spindle motor for the back spindle. The work held by the chuck 21 of the back spindle is mainly processed by the tool 18 attached to the back tool post 17 described above. However, when a tool for back machining is attached to the tool post 14, the work is held by them. It is also possible to process.

In order to process a work (part) of a round bar material by using this NC lathe, the round bar material is previously passed through the main shaft, guided by the guide bush 12 and slightly projected, and chucked by the main shaft. , And work. Then, the spindle is rotated to rotate the work, the tool rest 14 is moved in the X1 axis direction and the Y1 axis direction, and the peripheral surface is cut by the cutting tool 15 attached thereto, and the work is fixed to the rotary tool 16 Can be rotated to perform radial drilling or the like. Further, the rear headstock 20 is moved in the X2 axis direction and the Z2 axis direction, and the front end face of the work rotated by the main shaft is pierced or tapped by the relative rotary tool 23 attached to the opposed tool post 22. Processing can also be performed.

After that, the rear spindle headstock 20 is moved in the Z2 direction as indicated by the arrow, the front end portion of the work is grasped and held by the chuck 21 of the rear spindle headstock, and the tool post is attached to the tool post 14 using the cut-off tool. 14 is reciprocally moved in the direction of the arrow X1 to perform the cut-off processing, and the work is separated from the round bar. The delivery of this work is called pickoff. And
By moving the rear headstock 20 to a position facing the rear tool rest 17 and rotating the rear main spindle, on the rear surface of the workpiece held by the chuck 21 and rotating, by a relative rotary tool 23 such as a center drill or a rear tap, It is possible to perform drilling and tap cutting.

In this NC lathe, a tool post 14 and a tool 15, which is attached to the tool 15 and moves integrally, a rotary tool 16, a back spindle 20, a back spindle having a chuck 21 that moves integrally with the tool, and an opposing turret 22. The movable part such as the relative rotary tool 23 attached to it is the operating part, and the interference avoidance according to the present invention is performed so that the operating parts do not interfere with each other during operation.

Since the work held by the guide bush 12 on the main spindle side or held by the chuck 21 on the rear main spindle is machined by interfering with a tool (cutting tool), the work to be checked for interference during machining. exclude. However, since interference should not occur except during processing, it can be an operation unit targeted for interference avoidance. Furthermore, when a moving member such as a separator (receiver) for receiving the processed work is provided, it can also be an operation unit targeted for interference avoidance.

Next, the configuration of the NC device which is the control unit of this NC lathe will be described with reference to the block diagram of FIG.
This NC device includes a system control unit 40 including a CPU, a program input unit 41, a keyboard 42a, and a switch 4.
2b and an operation panel 44 having a display 43, an input / output control unit 45 thereof, a system control program memory (RO
M) 46, a machining program storage unit 48, a display data storage unit 49, a RAM 50 for storing other data, a machining program processing unit 51, and a machining operation control unit 52.
The drive unit 30 that directly drives and controls the mechanism unit shown in FIG. 2 is controlled via the machining operation control unit 52.

The drive unit 30 includes Z1, Z2, X1, X2.
The control drive unit 32 of each axis for driving and controlling the servo mechanism 31 of the Y1 axis servo motor, the spindle motor control drive unit 34 for driving and controlling the spindle motor 33 of each spindle (main spindle and rear spindle), and each sensor ( A sensor input unit 3 for inputting a detection signal of the position sensor of each table) 35
It consists of 6 mag.

The system control unit 40 is a unit for integrally controlling the entire NC device, and thus the entire NC lathe, and processes such as discrimination, conversion, and editing of the machining programs stored in the machining program storage unit 48 together with the machining program processing unit 51. ,
The keyboard 42 of the operation panel 44 via the input / output control unit 45
a or processing for inputting data or commands from the switch 42b and processing programs and other displays on the display 43, and the drive unit 30 is operated based on the processing program stored in the processing program storage unit 48 together with the processing operation control unit 52. Then, processing for performing NC processing is performed. In addition, processing related to interference avoidance according to the present invention is also performed here.

The program input section 41 is a paper tape reader, a floppy disk device (FDD) or the like for inputting a processing program created by an external program creating device (personal computer or the like) from a paper tape or a floppy disk. The operation panel 44 issues an operation command from the keyboard 42a or the switch 42b when performing NC processing,
The display 43 serves as a driving operation means for confirming the operation. The operation panel 44 is also used to perform input operations for presetting a combination of operation units that perform interference check and avoidance, the shape and coordinate origin of each operation unit, a priority order to enter an interference area described later, and the like.

The input / output control unit 45 determines the commands and inputs from the keyboard 42a or the switch 42b of the operation panel 44, controls for displaying the display data stored in the display data storage unit 49 on the display 43, and the like. To do. The system control program memory 46 is the NC
CP of the system control unit 40 for controlling the operation of the device
RO that stores the program and fixed data used by U
It is M.

The automatic programming section 47 includes a control panel 44.
This is a functional unit for creating a machining program in the NC device itself by interactive programming using. The machining program storage unit 48 includes the program input unit 4
R for storing the machining program input from 1 or the machining program created by the automatic programming unit 47
AM. The display data storage unit 49 is a bitmap memory (VRAM) that stores various data to be displayed on the display 43 of the operation panel 44.

The RAM 50 is a memory for storing data of each tool (tool) used for machining, various initial set data, etc., and is preset data for performing interference avoidance according to the present invention, that is, interference check and The RAM 50 also stores data such as the combination of the operating units for avoidance, the shape and coordinate origin of each operating unit, and the priority order of entering the interference area described later. The machining program storage unit 48 and the display data storage unit 49 are also the R
If the storage capacity of the AM 50 is sufficient, this can also be used.

The operation of the basic embodiment of the interference avoidance method according to the present invention will now be described with reference to the flow chart of FIG. When the NC device of the NC lathe described above starts operating, future trajectories of a plurality of moving parts that may interfere with each other are calculated and obtained in step 1, and future trajectories of the plurality of moving parts intersect in step 2. And set an overlapping area (possible interference). At this time, the actual operation timing and the calculated operation timing may deviate from each other, so that the time factor is not considered.

Then, in step 3, it is checked whether or not any of the plurality of motion parts has arrived just before entering the interference area (a position as close as possible to stop without entering the interference area when waiting must be done). If it comes immediately before, in step 4, the priority order of entering the interference area of the operation unit is confirmed. If the priority order is the highest, the process proceeds to step 7 and the interference area is directly entered. Then, in step 8, it is checked whether or not there is another operation unit that has not passed through the interference region, and if not, the process ends, and if there is, the process returns to step 3.

If the priority of the operating unit is not the highest in step 4, the process proceeds to step 5 to stop and wait before entering the interference area. Then, in Step 6, it is checked whether or not the operation unit having a higher priority goes out of the interference area, and when it goes out, the operation returns to Step 4 to check the priority order. At this time, the operation unit that has passed through the interference area is checked. The priority of is excluded.

As a result, if the priority of the operating unit in the standby state is the highest, it enters the interference area, but if there is another operating unit with a higher priority, the standby state is continued in step 5, When the operation unit having a higher priority goes out of the interference area, the process of step 6 to step 4 is repeated. In this way, when the priority of the operating unit in the standby state becomes the highest, the process proceeds to step 7 to enter the operating unit into the interference area.

As described above, when the interference avoidance method according to the present invention is implemented, the interference between the operating parts is automatically avoided by the processing different from the machining program. Therefore, when the programmer creates the machining program. It is not necessary to consider in advance the timing of movement of the operation unit that may cause interference.

Here, the setting of the interference area will be described. During operation of the NC machine tool, the NC device prefetches a plurality of blocks of the machining program in use to obtain future trajectories of a plurality of operating parts. Then, the area where the future trajectories of the plurality of operation units intersect and overlap, the area where there is a possibility of interference,
That is, the interference area is set.

FIG. 4A shows an example in which a two-dimensional interference check is carried out, and FIG. 4B shows an example in which a three-dimensional interference check is carried out. In both cases, the future trajectory 1a of the operating unit 1 and the operating unit are shown. A region (shown by hatching) where the future trajectory 2a of 2 intersects and overlaps is set as the interference region 3. Therefore,
In the case of a two-dimensional interference check, future trajectories 1a and 2a of the operation units 1 and 2 will be strip-shaped, and the interference area 3 will be a surface area. In the case of the three-dimensional interference check, the future trajectories 1a and 2a of the operation units 1 and 2 have a cylindrical shape, and the interference area becomes a three-dimensional area. The arrows in the figure indicate the movement directions of the operating units 1 and 2, and when the movement units are inclined, they are defined by components in directions orthogonal to each other.

FIG. 5 shows an example in which interference is avoided by a two-dimensional interference check. In this example, the operating unit 2 precedes the operating unit 1 immediately before the interfering region 3 (in the interfering region 3 when waiting is required). Although the vehicle arrives at a position before the interference area 3 by a distance d that can stop without entering, the priority order is confirmed there, and if the operation section 2 has a higher priority order than the operation section 1, it enters the interference area as it is. However, if the priority order is lower than that of the operation unit 1, it stops there and waits. Then, after the operation unit 1 passes through the interference area 3, the operation unit 2 enters the interference area. Therefore, the interference between the operation unit 1 and the operation unit 2 can be avoided.

As described above, the priorities for entering the interference areas of a plurality of operating units that may interfere with each other are preset using the operation panel 44 shown in FIG. 3 and stored in the RAM 50. be able to. However, even if the priority order of entering the interference area is not set in advance, the priority order can be set in the order in which a plurality of operation units arrive at the interference area earlier in time. The waiting time can be minimized.

For example, as shown in FIG. 6A, when the operating unit 2 arrives immediately before the interference region 3, if no other operating unit has entered the interference region 3, this operating unit 3 2 is given a priority, and is allowed to enter the interference area as it is. And
As shown in FIG. 6B, when the operating unit 1 arrives immediately before the interference region 3 when the operating unit 2 is in the interference region 3, the operating unit 2 that has entered the interference region 3 first. Has priority, the operation unit 1 stops and waits until the operation unit 2 comes out of the interference area 3. However, there is a possibility that a plurality of operating units will arrive immediately before the interference area 3, and in that case, one of the operating units will be given priority, but if the priority order is set in advance. , You can give priority accordingly.

If there is an operating part being processed among the plurality of operating parts, it is preferable to give priority to the operating part being processed. This is because, for example, if the operating part during cutting is stopped during the process, streaks may remain on the cut work (product).

When performing a three-dimensional interference check,
As shown in FIGS. 7 to 9, Z of the NC lathe shown in FIG.
1, Z2 axis direction (Z), X1, X2 axis direction (X),
The interference is checked by dividing the three-dimensional space in the Y1 axis direction (Y) into the projected shape on the XZ plane and the projected shape on the YZ plane. Here, a surface area obtained by projecting the three-dimensional interference area 3 shown in FIG. 4B onto the XZ plane is indicated by 3a, and Y-
The surface area projected on the Z plane is indicated by 3b. In the following description, the surface areas 3a and 3b are also referred to as interference areas. The arrows attached to the respective operating units 1 and 2 in the figure indicate the moving directions thereof.

In this case, there is no interference in the three-dimensional space even if the shapes of the operating parts 1 and 2 overlap only on one of the XZ plane and the YZ plane. Similarly, even if the operating unit 1 or 2 comes in front of the interference region 3a or 3b only on one of the surfaces,
In the three-dimensional space, it does not mean that the vehicle is in front of the interference area 3 (a position before the interference area 3 by a distance that can stop without entering the interference area 3 when it is necessary to wait).

Therefore, for example, the operation unit 1 is operated in the XZ plane and the Y direction.
-Interference area 3 on both sides of the Z plane prior to other moving parts 2
When it comes just before a and 3b, it means that the motion unit 1 has reached the motion unit 2 ahead of the motion interference region 3 immediately before the motion unit 2 in the three-dimensional space. As shown in FIG. 7, the interference region 3 (3a, 3b) is directly entered. Then, the motion 1 that arrives immediately before the interference region 3 (3a, 3b) is stopped at that position, and the motion unit 1 exits from the interference region 3 (at least the interference region 3a or 3b).
Wait until one goes out).

In this case, as shown in FIG.
On the −Z plane, even if it reaches immediately before the interference region 3b first, X
In the -Z plane, if it does not reach immediately before the interference region 3, the operating unit 2 has not yet arrived immediately before the interference region 3 in the three-dimensional space, so if the priority order is not decided, it moves as it is. Then, for example, the interference region 3b may enter the YZ plane, but in that case as well, since the operation unit 1 does not enter the interference region 3 in the actual three-dimensional space, there is no problem.

Then, as described above, when the operating unit 1 comes immediately before both the interference regions 3a and 3b (the state shown in FIG. 8), the operating unit 1 is given priority and the operating unit 1 remains as it is. It enters into the interference areas 3a and 3b. At that time, as shown in FIG. 9, it seems to interfere with the moving part 2 which has entered first in the interference area 3b of the YZ plane,
Since the operation unit 2 does not interfere in the XZ plane, the operation units 1 and 2 do not interfere in the three-dimensional space.

However, as shown in FIG.
If it comes in front of the interference region 3a even in the Z plane, it means that it comes in front of the interference region 3 in the three-dimensional space, so the priority order is confirmed and priority is given to the other operation unit 2.
Therefore, it stops and waits until the operation unit 2 leaves the interference region 3. As in the YZ plane of FIG.
If the shapes of the two overlap, it can be determined that they will no longer interfere in that plane, so it is not necessary to determine the priority in that plane, and it is possible to determine the priority in only the other plane. it can.

Further, even when three or more operating units have a common interference region, the priorities may be similarly determined and the interference regions may be passed in descending order of priority. If multiple moving parts reach just before the interference area,
Similar to the case of avoiding two-dimensional interference, the priority may be given according to a preset priority order, or the highest priority right may be given to the operating part being processed.

It is judged that the avoidance is completed when the relative distance between the operating parts during the interference avoiding operation starts to increase even for one axis. That is, among the plurality of operating units, the operating unit without priority waits immediately before the interference region, and while the operating unit with priority passes through the interference region, the relative distance between both operating units does not change. When the operation unit having the priority goes out of the interference area, the relative distance between the two starts to increase, and it can be determined that the avoidance is completed. Therefore, the operation unit on standby from that point can resume the movement. It is also possible to determine that the avoidance is completed at the moment when the vector amount of the relative distance of each axis (X, Y, Z) turns to increase.

Further, for safety, it is possible to perform a two-dimensional and three-dimensional interference check on a plurality of operating units and stop both operating units at the moment when the interference is detected. In that case, the alarm is canceled by the reset operation. The present invention can be applied not only to the NC lathe described above, but also to all NC machine tools having a plurality of operating parts.

[0049]

As described above, if the interference avoidance method according to the present invention is used, the interference between the moving tool rests of NC machine tools and the operating parts such as the tools attached thereto is avoided to enhance the safety. However, it is possible to reduce the possibility that the machine will stop operating due to an alarm condition so as not to lower the work efficiency, and to eliminate extra programs and unnecessary time. Further, even if a program is created without considering a delicate position or time relationship, interference can be avoided, and the program creation time can be shortened. The waiting part can be minimized because the waiting part of the operating parts that interfere with each other also waits immediately before entering the interference area.

[Brief description of drawings]

FIG. 1 is an operation flow diagram of a basic embodiment of an interference avoidance method according to the present invention.

FIG. 2 is an external perspective view of an essential part showing an example of an NC lathe that implements the interference avoidance method according to the present invention.

3 is a control unit N of the NC lathe shown in FIG.
It is a block diagram which shows the structural example of C apparatus.

FIG. 4 is an explanatory diagram for setting an interference area in step 2 of FIG.

FIG. 5 is an explanatory diagram of an interference avoiding operation when a two-dimensional interference area is set.

FIG. 6 is an explanatory diagram of another interference avoiding operation in that case as well.

FIG. 7 is an explanatory diagram of an interference avoiding operation when a three-dimensional interference area is set.

FIG. 8 is an explanatory diagram showing a state when the priority is determined.

FIG. 9 is an explanatory diagram showing a state in which the operating unit 1 is stopped and is on standby.

[Explanation of Codes] 1, 2 Operation part 3: Interference area 3a: Interference area projected on XZ plane 3b: Interference area projected on YZ plane 10: Bed 11: Turret base 12: Guide bush 13: XY table 14: Turret 15: Bit 16: Rotating tool 17: Back turret 18: Back machining tool 20: Back headstock 21: Chuck 22: Opposing turret 23: Relative rotating tool 30: Drive unit 40: System Control unit 44: Operation panel 45: Input / output control unit 46: System control program memory 48: Machining program storage unit 50: RAM 52: Machining operation control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G05B 19/19 G05B 19/19 M

Claims (5)

[Claims] 1. An NC machine tool having a plurality of moving parts having a possibility of interfering with each other, in the future, in a shape in which each of the plurality of moving parts is preset in an NC device during the operation of the NC machine tool. Of the plurality of operation units, sets an interference region where future trajectories of the plurality of operation units intersect and overlaps with each other, and confirms the priority of each operation unit entering the interference region before entering the interference region. , If the operating unit has the highest priority, it enters, and if there is another operating unit with a high priority, it stops before entering the interference area, and the operating unit with the higher priority operates in the interference area. A method for avoiding interference in an NC machine tool, which is characterized in that the user goes out of the area and does not interfere with it, and enters the interference area after the priority becomes highest. 2. During operation of the NC machine tool, a plurality of blocks of a machining program being used by the NC device are prefetched to obtain future trajectories of a plurality of operating parts, and future trajectories of the plurality of operating parts intersect. 2. The interference avoiding method for an NC machine tool according to claim 1, wherein the overlapping interference areas are set as a surface for a two-dimensional interference check and a solid for a three-dimensional interference check. 3. The NC according to claim 1, wherein the priority order is set in advance in the NC device.
Interference avoidance method for machine tools. 4. The interference avoidance method for an NC machine tool according to claim 1, wherein the priority order is set in the order in which the plurality of operation units reach the interference area earlier in time. 5. The interference avoidance method for an NC machine tool according to claim 1, wherein the priority is set to be higher for an operating part that is performing a processing operation than for an operating part that is not processing.