JPH0950311A - Numerical controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a numerical controller which can automatically generate a tool path to eliminate the need for describing again a program to cut an uncut area and also to attain a machining with no uncut area in a tool path shorter than the conventional one. SOLUTION: This numerical controller which generates a tool path to cut the graphic shape inside is provided with a graphic shape definition means 101 which reads the machining program out of a machining program store memory 100 and defines a graphic shape, an approximate graphic production means 102 which approximates both ends of the graphic shape defined by the means 101 by a circular arc touching three sides of the graphic shape and also approximates other areas of the graphic shape by a circular arc or a straight line touching two sides of the graphic shape, the tool path generation means 103 and 104 which generate the tool paths based on the approximate graphic produced by the means 102. In such a constitution, the numerical controller generates a tool path for the approximate graphic inside and then generates a too path for the uncut area between the defined graphic shape and the approximate graphic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical controller, and more particularly to a numerical controller for automatically generating a tool path, and a CAM (Computer Aided M) equipped with a simulator for the numerical controller.
It can be used for an aufacturing).

[0002]

2. Description of the Related Art FIG. 17 is a block diagram of a conventional numerical control apparatus. In the figure, 100 is a machining program storage memory that stores a machining program, 101 is a machining program storage memory that reads a machining program,
A graphic shape defining unit that defines the shape of the graphic, and 190 is a tool path creating unit that automatically creates a tool path based on the defined shape. The tool path generation means 190 automatically generates a tool path while enlarging the defined shape when machining the outside of the programmed shape, and defines it when machining the inside of the programmed shape. The tool path is automatically generated while reducing the shape. An interpolation processing unit 200 divides the automatically generated tool path into interpolation units and drives the motor 210.

Further, 191 is a process layout information storage memory, 192 is a tool file storage memory, 193 is a machining program storage memory 100, a process layout information storage memory 191, and a tool file storage memory 192. A simulation means for performing the machining simulation by reading the layout information of the machining process and the information of the tool described in the program, 194 is a screen control means, and 195 is C as a display means for displaying the simulation execution process.
It is an RT display.

FIG. 18 is a diagram showing a conventional shortest tool path that is automatically generated when cutting the inside of a shape. In the figure, 51 is a programmed figure, 52 is a circle showing a tool diameter, 53 is a tool path, 54 is a case where the tool path 53 is automatically generated using the diameter of the tool as a width for reducing the programmed figure 51. It is the uncut portion that occurs in.

FIG. 19 is a view showing a conventional general tool path automatically generated when cutting the inside of a shape.
In the figure, 51 is a programmed figure, 52 is a circle representing a tool diameter, and 55 is a tool path. In FIG. 19, in consideration of the uncut portion 54 in FIG.
It is a percentage.

FIG. 20 is a flow chart of the tool path generation processing of the conventional numerical control apparatus. Graphic shape definition means 1
01 reads the machining program from the machining program storage memory 100 in step s501, and step s50
The shape of the figure is defined from the machining program read in 2.

Next, in step s503, the tool path generating means 190 determines whether or not it is the first cut, and if it is the first cut, in step s504 the tool path is traced by shifting the figure shape by the tool radius. Generate,
In step s505, the load on the tool is set to 100%, and the feed rate is calculated by the following equation. [Programmed feed rate] × [coefficient 1], 0 <coefficient 1 <1

In the case of the second and subsequent cuts, in step s506, a tool path having a shift amount of [tool diameter] × [coefficient 2], 0 <coefficient 2 <1 is generated with respect to the previous tool path, and step s506 is executed. In s507, the programmed feed rate is selected as the feed rate for the second and subsequent cuts. In step s508, it is determined whether or not all tool paths have ended, and if the generated tool path is not the final tool path, tool path generation processing (step s505) and feed rate selection processing (step s506) until the final tool path is reached. )repeat.

FIG. 21 is a screen displaying the execution process of a conventional simulation. In the figure, 56 is a CRT
The screen, 57 is the shape of the tool, and 58 is the shape of the material that is cut by the tool 57 and changes from time to time.

[0010]

The conventional numerical control device for automatically generating a tool path as described above, when the uncut portion is left, needs to cut the portion left uncut.
Since it is necessary to create a program using another tool, there is a problem in that it is troublesome in terms of operation.Moreover, it is necessary to generate a large number of tool paths to eliminate uncut residue, There was a problem that the time was long.

Furthermore, when cutting the uncut portion again,
Since the feed rate is the same between the already cut portion and the newly cut portion, there is a problem that the processing time becomes long.

Furthermore, since the speed command is constant,
When the load applied to the tool during cutting varies, it is difficult to obtain a smooth finished surface.

Further, in the machining simulation, although the machining shape can be recognized, there is a problem that it is not possible to confirm the detailed dimension such as an error due to actual machining.

Further, since the tool path is generated in accordance with the layout information of the process determined in advance, there is a problem that the machining time becomes long when a command for frequently changing the tool is output. .

Further, since the tool to be selected uses the tool described in the program, the programmer has to select the tool to shorten the machining time, which causes a problem that the efficiency of the program decreases. was there.

[0016]

In the numerical control device according to the present invention, the approximate figure creating means is such that the figure shape defining means reads the machining program from the machining program storage memory, and defines the defined figure shape at both ends of the figure shape. Is approximated by an arc that is in contact with three sides by an arc or a line that is in contact with two sides, and the tool path generation means generates a tool path based on the approximate graphic created by the approximate graphic creation means.

Further, in the numerical controller according to the present invention, the uncut portion discriminating means is stored in the stereoscopic information storing memory, and is stored in the stereoscopic information storing memory. Information of the graphic definition mark among the information and the information of the graphic definition mark attached to the solid body occupied by the graphic and the information of the cut mark attached to the solid body where the tool passes by the tool path generation means. And the information of the cut mark is used to determine the uncut portion, and the movement code changing means checks whether the tool path generated for cutting the uncut portion includes a solid body with the already cut mark. If the tool path includes a solid with a mark already cut, this tool path cuts the uncut part and the tool path that passes through the already cut part. Is divided into, the already cut portion is to change the feed rate to move in rapid traverse.

Further, in the numerical control device according to the present invention, the cutting load detection means is stored in the three-dimensional information storage memory, and is stored in the three-dimensional information storage memory in the space divided into three-dimensional bodies of uniform size. Information of the graphic definition mark among the information and the information of the graphic definition mark attached to the solid body occupied by the graphic and the information of the cut mark attached to the solid body where the tool passes by the tool path generation means. The tool load is detected based on the modeled tool information, and the feed rate changing means calculates the feed rate according to the detected tool load.

Further, in the numerical controller according to the present invention, the space is divided into solid bodies of uniform size, and a solid defined by the programmed graphics in the space is marked with a graphic definition mark. , The information of the space divided into a solid of a uniform size and the information of the mark of the graphic definition attached to the solid occupied by the graphic are stored in the solid information storage memory, and the simulation means generates the tool path and The tool path is divided into interpolation units to create interpolation data, a cut mark is added to the solid body where the tool passes, and the information of this cut mark is stored in the simulation result storage memory. The size of the cut part is calculated from the information of the cut mark stored in this simulation result storage memory, and it is used as the size display data. It is obtained so as to store the law display data storage memory.

In the numerical controller according to the present invention,
The layout changing unit selects a process layout from the information in the process layout information storage memory that stores the process layout information, and the simulation unit performs a machining simulation of a machining program based on the process layout selected by the layout changing unit and performs simulation. The result is stored in the result storage memory, and the shortest processing time layout selecting means finds a process layout that completes the processing in the shortest time from the process layout stored in the result storage memory, and stores the process layout information in the process layout information storage memory. Is to write.

In the numerical controller according to the present invention,
The layout changing unit selects a process layout from the information in the process layout information storage memory that stores the process layout information, and the simulation unit performs a machining simulation of a machining program based on the process layout selected by the layout changing unit and performs simulation. The result is stored in the result storage memory, and the shortest processing time layout selecting means finds a process layout that completes the processing in the shortest time from the process layout stored in the result storage memory, and stores the process layout information in the process layout information storage memory. Is to write.

Further, in the numerical controller according to the present invention, the maximum diameter tool selecting means selects a tool to be used for machining from the information in the tool file memory storing the tool data,
The simulation means performs a machining simulation of the machining program based on the tool selected by the maximum diameter tool selection means, stores the simulation result in the result storage memory, and the shortest machining time tool combination selection means stores it in the result storage memory. A tool combination that completes machining in the shortest time is searched for from the existing tool combinations, and the process layout information is written in the machining program storage memory.

Further, in the numerical controller according to the present invention, the maximum diameter tool selecting means selects a tool to be used for machining from the information in the tool file memory storing the tool data,
The simulation means performs a machining simulation of the machining program based on the tool selected by the maximum diameter tool selection means, stores the simulation result in the result storage memory, and the shortest machining time tool combination selection means stores it in the result storage memory. A tool combination that completes machining in the shortest time is searched for from the existing tool combinations, and the process layout information is written in the machining program storage memory.

Furthermore, in the numerical controller of the present invention, the maximum diameter tool selecting means selects a tool to be used for machining from the information in the tool file memory storing the tool data, and the layout changing means stores the process layout information. The process layout is selected from the information in the process layout information storage memory, and the simulation means performs a machining simulation of the machining program based on the tool selected by the maximum diameter tool selection means and the process layout selected by the layout change means, The simulation result is stored in the result storage memory, and the shortest machining time tool combination selection means finds a combination of tools that completes machining in the shortest time from the tool combination stored in this result storage memory, and stores it in the machining program storage memory. Process layout information Writing, the shortest processing time layout selection means locates the complete process layout from the machining in the shortest time step layout that is stored in the result storage memory, and writes the process layout information to the process layout information storage memory.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment of the Invention FIG. 1 is a block diagram of a numerical controller according to an embodiment of the present invention. In the figure, 1
00 is a machining program storage memory for storing a machining program, 101 is a figure shape defining means for reading the machining program from the machining program storage memory 100 to define the shape of the figure, and 102 is an arc of the figure defined by the figure shape defining means 101. And an approximate figure creating means for approximating with a straight line, 1
Reference numeral 03 is a first tool path generating means for enlarging or reducing the approximated figure by the approximate figure creating means 102 to generate a tool path, and reference numeral 104 is a second for reducing or expanding the approximated figure to generate a tool path. Is a tool path generating means, 200 is an interpolation processing means for dividing the automatically generated tool path into interpolation units, and 210 is a motor.

FIG. 2 is a diagram showing a tool path automatically generated by an embodiment according to the present invention. In the figure, 1 is a programmed figure, 2 is a circle representing a tool diameter, 3 is a contact point, 4 is a contact point, 5 is a contact point, and 6 is a contact point 3, a contact point 4 and a contact point 5 on three sides of the programmed figure 1. Arcs contacting at three points, 7 is a contact point, 8 is a contact point, 9 is a contact point, 10 is a contact point on three sides of the programmed figure 1, and 7 are contact points, 8 and 9 are three contact points, 11 is a contact point, and 12 is a contact point. contact,
Reference numeral 13 denotes a circular arc which is in contact with two sides of the programmed figure 1 at two points of a contact point 11 and a contact point 12, and 14 is a figure approximating means 102.
Approximate figure obtained by approximating the figure defined by the above with a circular arc and a straight line, 15 is a tool path in which the outside of the tool 2 is in contact with the inside of the approximate figure, and 16 is an uncut portion outside the approximate figure 14.

FIGS. 3, 4 and 5 are views showing an automatically generated tool path which is an embodiment of the present invention. In FIG. 3, 21 is a programmed figure, 22
Is a circle representing the tool diameter, 23 is a contact point, 24 is a contact point, 25 is a contact point, and 26 is a contact point 2 on three sides of the programmed figure 21.
3, arcs that contact at three points of contact point 24 and contact point 25, 27
Is a contact, 28 is a contact, 29 is a contact, 30 is a contact 27, a contact 28 and a contact 2 on three sides of the programmed graphic 21.
An arc which is in contact with three points 9 and 31 is an approximate figure obtained by approximating the figure defined by the figure approximating means 102 with an arc and a straight line, 3
Reference numeral 2 denotes a tool path in which the outside of the tool 22 contacts the inside of the approximate figure 21, and 33 is an uncut portion outside the approximate figure 21.

4 and 5 are views showing an automatically generated tool path according to an embodiment of the present invention, showing a tool path for cutting the outside of the approximated figure. In the figure, 35 is a tool path obtained by enlarging the approximate shape by a value equal to the radius of the tool, 36 and 37 are intersections of the tool path 35 and the tool path along the inside of the programmed shape 21, and 38 and 39 are approximate. It is a tool path for cutting the uncut portion 33 outside the figure 21.

FIG. 6 is a flow chart of the numerical controller according to one embodiment of the present invention. Next, the operation will be described with reference to FIGS. 1, 2, 3, 4, 5, and 6. In step s100, the machining program is loaded, and in step s101, the programmed figure is
It is approximated by a straight line and an arc that touches three sides. (In FIG. 3, the circular arc 26 that contacts the three sides with the contact point 23, the contact point 24, and the contact point 25)
And an approximated figure 21 approximated by a circular arc 30 which is in contact with the contact points 27, 28 and 29 on three sides, a straight line connecting the contact points 25 and 27 and a straight line connecting the contact points 29 and 23.
Convert to )

In step s102, it is determined whether or not there is a portion where there are no arcs in contact with the three sides. If there is a portion that does not have an arc that touches the three sides, step s103
Then, it is approximated by an arc that touches two sides. (A circular arc 13 that contacts the two sides with the contact 11 and the contact 12 corresponds to this, and in this case, an arc 6 that contacts the three sides with the contact 3, the contact 4, and the contact 5 and a contact 7 and the contact 3 with the three sides. 8 and the arc 10 that contacts with the contact 9, and the arc 13 that contacts with the contact 11 and the contact 12 on two sides
And a straight line connecting the contact points 5 and 7, a straight line connecting the contact points 9 and 11, and a straight line connecting the contact points 9 and 11 are converted into an approximate figure 14. )

In step s104, a tool path is created such that the outside of the tool is in contact with the inside of the approximate figure (tool path 15 in FIG. 2, tool path 32 in FIG. 3). Step s10
In step 5, the previous tool path is reduced by a value equal to the diameter of the tool or a value slightly smaller than the diameter of the tool (for example, 0.001 millimeters smaller than the diameter of the tool), and a new tool path is created. To generate.

In step s106, it is determined whether all tool paths inside the approximate graphic have been generated, and the processing for generating tool paths in step s105 is repeated until all tool paths inside the approximate graphic are generated.

When all the tool paths inside the approximate figure have been generated, a tool path for cutting the uncut portion outside the approximate figure is then generated (the uncut portion 16 in FIG. 2).
The uncut portion 33 of FIG. 3). Hereinafter, description will be given with reference to FIGS. 4 and 5 showing a tool path for cutting the outside of the approximated figure.

In step s107, the approximate figure 31 is enlarged by the radius of the tool 22 to generate a tool path for cutting the outside of the approximate figure 31 and the inside of the programmed figure 21. In FIG. 4, a tool path is generated so as to follow the inside of the programmed figure 21, and if this tool path and the figure 35 obtained by enlarging the approximate figure 31 by the radius of the tool 2 have intersections, they intersect. Part (intersection 36, 37)
Generates the tool path 38 so as to pass through the arc portion of the enlarged graphic 35.

In step s108, it is determined whether all tool paths outside the approximated figure have been generated, and all tool paths outside the approximated figure are generated until step s10.
The process of generating the tool path 7 is repeated. Here, it is determined whether all tool paths outside the approximated figure are generated,
As shown in FIG. 5, when a tool path is generated by further enlarging the approximated figure (enlarged by the radius of the tool 2) and there is no intersection with the tool path along the inside of the programmed figure 21, It is determined that all tool paths outside the approximated figure have been generated, and the tool path 39 along the inside of the programmed figure 21 is generated.

Embodiment 2 of the Invention FIG. 7 is a diagram illustrating a space definition technique used in an embodiment according to the present invention. In the figure, 40 is a material shape, 41 is a programmed graphic shape, 42 is a rectangular parallelepiped or a cube (hereinafter referred to as Voxe) having a predetermined size for defining the material shape.
), 43 is a Voxel marked to show the programmed graphic shape.

FIG. 8 is a block diagram of a numerical controller according to an embodiment of the present invention. In the figure, 100 is a machining program storage memory for storing a machining program, 1
Reference numeral 10 divides the space into Voxels that are solid bodies of uniform size, and also marks the Voxels occupied by the programmed figures in the space in this Voxel with a figure definition mark, and sets the Voxels with this mark. As a figure shape conversion means for expressing a figure as
The array converting means 111 generates a tool path, and Vo that the tool passes is generated by the generated tool path.
tool path generation means for attaching a cut mark to xel,
Reference numeral 112 denotes a Voxel array created by the Voxel array conversion means 110, and a Voxel array storage memory for storing the Voxel marked with the mark that has been cut by the tool path generation means 111, and 113 has been cut by the Voxel with a solid definition mark. Uncut remaining discriminating means for discriminating Voxel without a mark as uncut portion, 114 is fast feed (G00), cutting feed (G0).
1, G02, G03) and the like, movement code changing means for changing the movement code, 200 is interpolation processing means for dividing the automatically generated tool path into interpolation units, and 210 is a motor.

FIG. 9 is a flow chart of the numerical controller according to the embodiment of the present invention. Next, the operation will be described with reference to FIGS. 7, 8 and 9. Voxel
The array conversion means 110 reads the machining program stored in the machining program storage memory 100 in step s110, recognizes the programmed figure shape in step s111, and in step 112 the cylinder whose diameter is the diameter of the bottom surface of the tool. Model the tool with.

At step s113, the shape of the material is Vox.
Voxel which is divided by el42 and which is occupied by the programmed solid 41 in the material is marked with a solid definition mark, and the programmed solid 41 is expressed as a set of Voxels 43 with the solid definition mark. here,
All the created Voxels are stored in the Voxel array storage memory 112.

Next, the tool path generating means 111 generates a tool path in step s114. In step s115, the Voxe through which the tool passes according to the generated tool path.
Check l and make a cut mark on the Voxel through which the tool passes. In step s116, it is determined whether the final tool path is generated, and until the final tool path is generated,
Steps s114 and s115 are repeated.

After the final tool path is generated, the uncut portion discriminating means 113 determines the Voxel a in step s117.
All Voxels in the rray storage memory 112 are checked to determine whether there is any uncut portion. This determination is
It is determined that the Voxel that has already been cut with the Voxel with the solid definition mark is left uncut.

If it is determined that there is an uncut portion, the tool path generation means 111 needs to replace it with another tool (for example, a tool having a small diameter) in order to cut again the portion left uncut in step s118. If it is necessary to replace the tool, a tool replacement command is output in step s119. In step s120, a tool path for recutting the uncut portion is generated.

The movement code changing means 114 executes step s.
At 121, a V that has already been cut is added in the tool path generated for cutting the uncut portion again.
It is checked whether or not an oxel exists, and if there is a Voxel with a mark that has already been cut, this tool path is used as a tool path for cutting an uncut part and a tool path that passes through an already cut part. The feed rate is changed so that the portion that has already been cut is moved by rapid feed (G00).

The uncut portion discriminating means 113 checks again all the Voxels in the Voxel array storage memory 112 in step s117 to determine whether or not there is uncut portion. If there is uncut material, step s118
The following processing for generating a tool path is repeated, and when there is no uncut portion, all processing for generating a tool path is ended.

Third Embodiment of the Invention FIG. 10 is a block diagram of a numerical controller according to an embodiment of the present invention.
In the figure, 100, 110, 112, 200, 210
Is the same as the block diagram of FIG. 8, and its description is omitted. Reference numeral 115 is a tool path generating means, 116 is a cutting load detecting means, and 117 is a feed rate changing means for changing the feed rate according to the load.

FIG. 11 is a flow chart of an example of the numerical controller according to the embodiment of the present invention. next,
The operation will be described with reference to FIGS. Vox
The el array converting means 110 performs step s110.
At step s111, the machining program is read in to recognize the programmed figure shape, and at step s112, the tool is modeled as a cylinder having the diameter of the tool as the diameter of the bottom surface. In step s113, change the shape of the material to Voxel42.
Then, the Voxel occupied by the programmed solid 41 in the material is marked with a solid definition mark, and the programmed solid 41 is expressed as a set of Voxels 43 with the solid definition mark. Here, all the created Voxels are stored in the Voxel array storage memory 112.

The tool path generating means 115 has step s1.
In step 30, it is determined whether or not it is the first cutting. If it is the first cutting, the graphic shape is reduced by the radius of the tool in step s131 to generate the tool path. In addition, in the case of the second and subsequent cuts, in step s132, the previous tool path is further reduced by the diameter of the tool to generate the tool path.

The cutting load detecting means 116 and the feed speed changing means 117 detect the load of the tool and calculate the feed speed according to the load in step s133. To detect the load of this tool, the tool modeled in step s112 is Vo
Voxel depending on the number of Voxels applied to the xelarray and the tool applied to the Voxel array
It is determined that the load of the tool is larger as the number of is larger. For example, if 100 Voxels have a feed rate of 100 when applied to a tool model, and if 50 Voxels are applied to the tool, the feed rate will be 200, and so on. calculate.

In step s134, it is determined whether or not the final tool path has been generated, and the processing for generating the tool path in and after step s131 is repeated until the final tool path is generated. When the final tool path has been generated, all the processes are finished.

Embodiment 4 of the Invention FIG. 12 is a block diagram of a numerical controller according to an embodiment of the present invention.
In the figure, 100 is a machining program storage memory for storing a machining program, and 110 is a Voxel which divides a space into three-dimensional Voxels each having a uniform size.
V of a programmed figure in space of l
A Voxel array converting means as a graphic shape converting means for putting a mark of a graphic definition on an oxel and expressing the graphic as a set of Voxels with this mark, 112
Is a Voxelarray storage memory, 120 is a simulation means for performing interpolation processing, 121 is a simulation result storage memory for storing simulation results,
Reference numeral 122 is a means for calculating the size of the cutting portion of the Voxel array, 123 is a size display data storage memory for storing size display data, 124 is a screen control means, 19
Reference numeral 5 is a CRT as a display means.

FIG. 13 is a screen display example of the numerical controller according to the embodiment of the present invention. In the figure, 50 is C
RT screen, 51 is a graphic display of the processed shape, and 52 is a size display.

FIG. 14 is a flowchart of the numerical controller according to the embodiment of the present invention. Next, the operation will be described with reference to FIGS. 12, 13 and 14. The machining program is read in step s110, and the graphic shape programmed in step s111 is recognized. Vo
The xel array converting means 110 performs step s113.
Divides the shape of the material into Voxels 42, and the Voxels occupied by the programmed figure 41 in the material
A graphic 41 that is programmed as a set of Voxels 43 with a graphic definition mark attached to
To express. Here, all created Voxels are Vo
Stored in the xel array storage memory 112.

The simulation means 120 generates a tool path for one block in step s140 and
In step s141, the generated tool path for one block is divided into interpolation units to create interpolation data. In step s142, a cut mark is attached to the Voxel through which the tool passes in the movement range corresponding to one cycle of the interpolation process. In step s143, it is determined whether or not there is a remaining distance. This is a determination as to whether or not the interpolation processing has completed the movement of one block. If there is a remaining distance, steps s141 and s1 are performed until the interpolation of one block is completed.
The interpolation process of 42 is repeated.

When the remaining distance is exhausted, it is then determined in step s144 whether or not all tool paths have ended. If not all tool paths have ended, the process returns to step s140 until the generation of all tool paths is completed, and the next 1 Interpolate blocks. The above-mentioned steps s140 to s144 are executed by the simulation means in FIG. 12, and the simulation result is stored in the simulation result storage memory 121.

When all tool paths are completed, Voxel a
The means 122 for calculating the dimension of the cutting portion of the rray creates the dimension display data of the machining drawing by comparing the figure by the machining program with the cut Voxel after simulation in step s145, and stores the dimension display data. It is stored in the memory 123.

In step s146, the screen control means 124
CRT 195 CRT based on this dimension display data
A graphic display 51 and a dimension display 52 of the processed shape are displayed on the screen 50.

Fifth Embodiment of the Invention FIG. 15 is a block diagram of a numerical controller according to an embodiment of the present invention.
In the figure, 100 is a machining program storage memory that stores a machining program, 191 is a process layout information storage memory, 192 is a tool file storage memory, and 130 is a maximum diameter tool that selects a tool with the maximum diameter from the same type of tool group. A selection unit, 131 is a layout changing unit, 132 is a simulation unit, 133 is a result storage memory for storing a simulation result, 134 is a tool combination selection unit for the shortest machining time, and 135 is a layout selection unit for the shortest machining time. .

FIG. 16 is a flowchart of the numerical controller according to the embodiment of the present invention. Next, the operation will be described with reference to FIGS. Step s1
At 51, the maximum diameter tool selection means 130 selects a tool to be used for machining from the information in the tool file memory 192.
In step s152, the layout changing unit 131 selects a process layout from the information in the process layout information storage memory 191.

In step s153, the simulation means 132 performs a machining simulation of the program in the machining program storage memory 100 with the selected tool and the selected process layout. In step s154, the processing time by simulation, the combination of tools used at that time, and the process layout are stored in the result storage memory 1.
Record at 33. In step s155, it is determined whether all process layouts have been changed. If all process layouts have not been changed, steps s152 and s are performed until all process layouts are simulated.
153 and step s154 are repeated.

After simulating all the process layouts, it is determined in step s156 whether or not all the tool combinations have been changed. If there is a tool combination that has not been executed, the process returns to step s151 to set the tool combinations. After the change, the simulation of all the process layouts is performed in step s152, step s153, step s154 and step s155. If the simulation in which all the combinations of tools have been changed is completed, the result storage memory 133 is entered in step s157.
From the information of the process layout, the tool combination selecting means 134 having the shortest machining time finds a combination of tools which completes the machining in the shortest time, writes the tool to be used in the machining program storage memory 100, and also has the shortest machining time. The layout selecting means 135 finds a process layout that completes the processing in the shortest time, and writes the layout information in the layout information storage memory 191.

In the above embodiment, the maximum diameter tool selecting means 130 and the layout changing means 131 are continuous, and the tool combination selecting means 134 for the shortest machining time and the layout selecting means 135 for the shortest machining time are used. However, it is not always necessary to use both in combination in the application.

[0062]

Since the present invention is constructed as described above, it has the following effects.

After the tool path inside the approximated figure approximated by an arc or a straight line in which both ends of the figure are in contact with three sides and other sides are in contact with two sides, the defined figure and the approximated figure are generated. Since the tool path of the uncut portion between is generated, even if the tool path is created with a shift amount of the diameter of the tool, there is no uncut residue inside the approximate shape -Free machining is possible with a shorter tool path than before, and machining time can be shortened. Also, there is no need to write a program for cutting the uncut residue again.

Further, the tool path generated for cutting the uncut portion is divided into a tool path for cutting the uncut portion and a tool path for passing the already cut portion, and the already cut portion is moved by rapid feed. Since the feed rate is changed, the processing time can be shortened.

Further, information on a space divided into a solid body having a uniform size, information on a graphic definition mark attached to the solid body occupied by the graphic, and the solid body through which the tool passes by the tool path generation means. Since the tool load is detected based on the information of the figure-defined mark and the modeled tool among the information of the cut marks that have been cut, it is possible to detect the fluctuation of the load applied to the tool. Since the cutting is performed at the feed rate according to the load, a smooth finished surface can be obtained.

In addition, the simulation means generates a tool path, divides the generated tool path into interpolation units to create interpolation data, attaches a cut mark to a solid body through which the tool passes, and cuts the cut path. The mark information is stored in the simulation result storage memory, and the dimension calculation means calculates the dimension of the cut portion based on the cut mark information stored in the simulation result storage memory and is stored in the dimension display data storage memory. Since the dimension display data is displayed as the dimension of the cutting portion on the display means, it is easy to find a mistake in the program and the machining accuracy can be easily confirmed.

In the numerical controller according to the present invention,
The shortest machining time layout selecting means performs a machining simulation of a machining program based on the process layout selected by the layout changing means by the simulation means, and selects a process layout that completes machining in the shortest time than the process layout stored in the result storage memory. Since the process layout information is searched for and written in the process layout information storage memory, even when a command for frequent tool change is output, the process layout that can be processed in the shortest processing time can be selected, and the processing time can be reduced. It can be shortened.

Further, in the numerical control device of the present invention, the shortest machining time tool combination selecting means performs the machining simulation of the machining program on the basis of the tool selected by the simulation means by the maximum diameter tool selecting means, The tool combination that completes machining in the shortest time is searched for from the combination of tools stored in the result storage memory, and the process layout information is written to the machining program storage memory, so that the machining efficiency can be reduced in the shortest time. It is possible to automatically select the combination of tools that can be used.

Furthermore, in the numerical controller of the present invention, the shortest machining time tool combination selecting means performs simulation of the machining program based on the tool selected by the simulating means by the maximum diameter tool selecting means. Finding a combination of tools that completes the machining in the shortest time than the combination of tools stored in the result storage memory, writing the process layout information in the machining program storage memory, the shortest machining time layout selection means, the simulation means is the layout change means. Based on the selected process layout, perform a machining simulation of the machining program, find the process layout that completes the machining in the shortest time from the process layout stored in the result storage memory, and store the process layout information in the process layout information storage memory. Since to burn them, it is efficient tool selection and tool exchange.

[Brief description of drawings]

FIG. 1 is a block diagram of a numerical controller according to an embodiment of the present invention.

FIG. 2 is a diagram showing a tool path automatically generated by an embodiment according to the present invention.

FIG. 3 is a diagram showing an automatically generated tool path according to an embodiment of the present invention. (It shows a tool path for cutting the inside of the approximate shape.)

FIG. 4 is a diagram showing an automatically generated tool path according to an embodiment of the present invention. (It shows a tool path for cutting the outside of the approximate shape.)

FIG. 5 is a diagram showing an automatically generated tool path according to an embodiment of the present invention. (It shows a tool path for cutting the outside of the approximate shape.)

FIG. 6 is a flowchart of a numerical control device according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating a space definition technique used in an embodiment according to the present invention.

FIG. 8 is a block diagram of a numerical controller according to an embodiment of the present invention.

FIG. 9 is a flowchart of a numerical controller according to an embodiment of the present invention.

FIG. 10 is a block diagram of a numerical controller according to an embodiment of the present invention.

FIG. 11 is a flowchart of an example of the numerical control device according to the embodiment of the present invention.

FIG. 12 is a block diagram of a numerical controller according to an embodiment of the present invention.

FIG. 13 is a screen display example of the numerical control device according to the embodiment of the present invention.

FIG. 14 is a flowchart of a numerical control device according to one embodiment of the present invention.

FIG. 15 is a block diagram of a numerical controller according to an embodiment of the present invention.

FIG. 16 is a flowchart of a numerical controller according to an embodiment of the present invention.

FIG. 17 is a block diagram of a conventional numerical control device.

FIG. 18 is a diagram showing a conventional shortest tool path that is automatically generated when cutting the inside of a shape.

FIG. 19 is a view showing a conventional general tool path that is automatically generated when cutting the inside of a shape.

FIG. 20 is a flowchart of a tool path generation process of a conventional numerical controller.

FIG. 21 is a screen displaying the execution process of a conventional simulation.

[Explanation of symbols]

1 programmed geometry, 2 circle representing tool diameter,
3 contact points, 4 contact points, 5 contact points, 6 3 point contact arcs, 7 contact points, 8 contact points, 9 contact points, 1
0 3 point contact arc, 11 contact points, 12 contact points,
13 Arcs that touch at two points, 14 Approximate figures that are approximated by arcs and straight lines, 15 Tool paths where the outside of the tool 2 contacts the inside of the approximate figures, 16 Uncut portions that are outside the approximate figures 14, 17, 18, 19, 20
, 21 programmed figure, 22 circle representing tool diameter, 23 contact points, 24 contact points, 25 contact points, 263 circular arcs contacting at 3 points, 27 contact points, 28
Contact point, 29 contact points, 30 Arcs contacting at 3 points, 3
1 Approximate figure approximated by arc and straight line, 32 Tool 22
The tool path in which the outside of the figure contacts the inside of the approximate figure, 33 The uncut portion outside the approximate figure 21, 34, 3
5 Tool path in which the approximated figure is enlarged by a value equal to the radius of the tool, 36 Tool path 35 and programmed figure 2
1 an intersection with a tool path along the inner side of 37, 37 an intersection between the tool path 35 and a tool path along the inner side of the programmed figure 21, 38 cut an uncut portion 33 outside the approximated figure 21 Tool path, 39 Tool path for cutting the uncut portion 33 outside the approximated figure 21, 40 Material shape, 41 Programmed graphic shape, 42 Cuboid of fixed size to define material shape, or cube ( Hereinafter, referred to as Voxel), 43 Voxel marked to show a programmed graphic shape, 50 CRT screen, 51
Graphic display of machining shape, 52 dimension display,
100 machining program storage memory, 101 figure shape defining means, 102 approximate figure creating means, 103
1st tool path generation means, 104 2nd tool path generation means, 110 Voxe as figure shape conversion means
l array conversion means, 111 tool path generation means, 112 Voxel array storage memory, 1
13 Leftover cut discriminating means, 114 Moving code changing means, 115 Tool path generating means, 116 Cutting load detecting means, 117 Feed speed changing means, 112 V
oxel array storage memory, 120 simulation means, 121 simulation result storage memory, 122 means for calculating dimensions of cutting portion of Voxel array, 123 dimension display data storage memory, 124 screen control means, 130 maximum diameter tool selection means, 131 layout Changing means, 132
Simulation means, 133 Result storage memory for storing simulation results, 134 Tool combination selection means for minimum machining time, 135 Layout selection means for minimum machining time, 191 Process layout information storage memory, 192 Tool file storage memory, 195 display CRT display as a means,
200 interpolation processing means, 210 motor.

Claims (7)

[Claims] 1. A numerical control device for generating a tool path for cutting the inside of a figure shape, wherein a machining program storage memory for storing a machining program and the machining program are read from the machining program storage memory to define the shape of the figure. A graphic shape defining means, an approximate graphic creating means for approximating a graphic shape defined by the graphic shape defining means with an arc of which both ends are in contact with three sides and another area is in contact with two sides, or a straight line, and this approximate graphic A tool path generating means for generating a tool path based on the approximate figure created by the creating means, and generating a tool path inside the approximate figure, and then cutting between the defined figure shape and the approximate figure A numerical controller characterized in that a tool path of a remaining portion is generated. 2. A shape shape conversion means for dividing a space into solid bodies of a uniform size and for marking a solid defined by a programmed figure in the space in the space to define a shape and a tool path. In addition, according to the generated tool path, tool path generation means for attaching a cut mark to the solid body where the tool passes, and space information and graphics divided into solid bodies of uniform size by the graphic shape conversion means. A stereoscopic information storage memory for storing the information of the mark of the figure definition attached to the solid body occupied by the solid body and the information of the cut mark attached to the solid body through which the tool passes by the tool path generating means; An uncut portion discriminating means for discriminating the uncut portion based on the information of the mark of the graphic definition and the information of the already-cut mark stored in the information storage memory, and the uncut portion is cut. Check if the tool path generated to include a solid with a mark already cut,
If this tool path includes a solid with a mark already cut, divide this tool path into a tool path that cuts the uncut portion and a tool path that passes through the already cut portion, and cut already. The numerical control device is provided with a movement code changing means for changing the feed speed so that the portion moves at a fast forward speed. 3. A graphic shape conversion means for dividing a space into solid bodies of uniform size and for marking a solid defined by a programmed graphic in the space among the solid bodies with a graphic definition mark, and a tool path. In addition, according to the generated tool path, tool path generation means for attaching a cut mark to the solid body where the tool passes, and space information and graphics divided into solid bodies of uniform size by the graphic shape conversion means. A stereoscopic information storage memory for storing the information of the mark of the figure definition attached to the solid body occupied by the solid body and the information of the cut mark attached to the solid body through which the tool passes by the tool path generating means; Cutting load detecting means for detecting the load of the tool based on the information of the mark of the graphic definition stored in the information storage memory and the information of the modeled tool, and this cutting load detecting means And a feed rate changing means for calculating the feed rate according to the load of the tool detected by the numerical control device. 4. A numerical controller having a display means and a screen control means for controlling the display means, which divides a space into three-dimensional bodies of uniform size and which is programmed in the space of the three-dimensional bodies. A figure shape conversion means for attaching a mark of figure definition to a solid body occupied by a figure, information of space divided into a solid body of a uniform size by the shape shape conversion means, and a mark of graphic definition attached to the solid body occupied by the figure A three-dimensional information storage memory that stores information and a simulation means that generates a tool path, divides the generated tool path into interpolation units to create interpolation data, and attaches a cut mark to the solid where the tool passes. And a simulation result storage memory for storing the simulation result of this simulation means, and a memory for storing this simulation result. Dimension calculation means for calculating the dimension of the cut part based on the information of the cut mark stored in
A dimension display data storage memory that stores the dimension of the cut portion calculated by the dimension calculation means as dimension display data, and the dimension of the cut portion is displayed on the display means. Numerical control device. 5. A process layout information storage memory for storing process layout information, a layout changing means for selecting a process layout from information in the process layout information storing memory, and a process layout selected by the layout changing means, A simulation means for performing a machining simulation of a machining program, a result storage memory for storing a result of simulation by the simulation means, and a process layout for completing the machining in the shortest time from the process layout stored in the result storage memory are searched for, A numerical control device comprising: a shortest processing time layout selecting means for writing the process layout information into the process layout information storage memory. 6. A machining program storage memory for storing a machining program, a tool file memory for storing tools, a maximum diameter tool selecting means for selecting a tool to be used for machining from information in the tool file memory, and a maximum diameter tool selecting means. A combination of a simulation means for performing a machining simulation of a machining program based on the tool selected by the diameter tool selection means, a result storage memory for storing the result of simulation by this simulation means, and a tool stored in the result storage memory A numerical control device comprising: a tool combination selecting means for finding a tool combination that completes machining in a shorter time and writing a tool to be used in the machining program storage memory. 7. A machining program storage memory for storing a machining program, a tool file memory for storing tool data, a maximum diameter tool selecting means for selecting a tool to be used for machining from information in the tool file memory, and a process. A process layout information storage memory for storing layout information, a layout changing means for selecting a process layout from the information in the process layout information storing memory, a tool selected by the maximum diameter tool selecting means, and a layout changing means selected by the layout changing means. Based on the specified process layout, a simulation means for performing a machining simulation of a machining program, a result storage memory for storing the results of simulation by this simulation means, and a combination of tools stored in the result storage memory enable machining in the shortest time. Tools to complete And a process layout for completing the machining in the shortest time from the process layout stored in the result storage memory and the shortest machining time tool combination selecting means for writing the tool to be used in the machining program storing memory, and the process A numerical control device comprising: a shortest processing time layout selecting means for writing process layout information in a layout information storage memory, and selecting a combination of a process layout and a tool that completes processing in the shortest time.