JP4577303B2 - Tool axis attitude determination device, tool axis attitude determination method, and program - Google Patents

Description

  The present invention relates to machining analysis of cutting, and more particularly to a tool axis attitude determination device, a tool axis attitude determination method, and a program for determining a tool axis attitude.

NC (Numerical Control) machine tools are generally used in machining operations such as dies. The machining operation of the NC machine tool is determined by performing shape design using a CAD (Computer Aided Design) system, machining design using a CAM (Computer Aided Manufacturing) system, or the like.
Furthermore, in recent years, as prior verification of machining operations, detection of interference and the like has been performed based on NC data and the like created by a CAM system. This prevents machining troubles in advance.
On the other hand, in order to improve the machining efficiency and the quality of the cut surface, it is desired that a tooling with high rigidity can be determined.

FIG. 14 is a schematic diagram illustrating the interference between the holder 47 and the curved surface 41. In this example, the tool axis posture is in the Z-axis direction, but some NC machine tools are not limited to the tool axis posture fixed in the Z-axis direction, but also include 4-axis control and 5-axis control. Some tools can be tilted like this.
In order to avoid the interference as shown in FIG. 14, it is necessary to perform a machining simulation on the tool path in advance, check the presence / absence of the interference, and correct the tool path, tooling, or tool axis posture. . Patent Documents 1 and 2 are examples of such interference avoidance mechanisms.

Japanese Patent Application Laid-Open No. H10-228707 performs interference determination with a curved surface using a conical interference model including a tool and a holder. When interference is detected, the interference avoidance angle of the tool axis is obtained based on the amount of interference, and the tool axis is tilted to avoid interference.
FIG. 15 is a schematic diagram showing the tool axis posture after interference avoidance. As shown in FIG. 15, interference can be avoided by tilting the tool axis.

  Patent Document 2 performs a simulation of moving on a tool path using an interfered body in which a tool axis posture is fixed in the Z-axis direction and a tool and a holder are virtually assumed. Then, every time the interference with the curved surface is detected, the interfered body is updated, and the tooling in which no interference occurs is determined based on the final interfered body.

Another mechanism for avoiding interference is Non-Patent Document 1.
Non-Patent Document 1 expresses the posture of the tool axis by the angle θ formed by the tool axis and the curved surface normal, and the rotation angle φ of the tool axis, and calculates the interference determination for each combination of 0 and 180 degrees of θ and φ I do. Based on the result of the interference determination, a tool axis posture in which interference is unlikely to occur is determined.
JP-A-6-254741 JP-A-9-179620 Koichi Morishige, Satoru Kase, Yoshimi Takeuchi, "Tool path generation method for 5-axis control machining using C-Space-Machining strategy and tool path generation based on it-", 1998 Precision Engineering Society Spring Proceedings of Annual Conferences of Conferences, Japan Society for Precision Engineering, 1998, p37

However, in the method described in Patent Document 1, since the tool axis posture is determined by performing the interference determination after determining the tooling, the tool axis posture depending on the tooling is determined. For this reason, tooling with high rigidity cannot be automatically determined, for example, by reducing the tool protrusion amount. Furthermore, in this method, the tool axis posture after avoiding interference is determined only by the amount of local interference, so that the tool axis posture has a large margin on the right side of the tool 45 and the holder 47 as shown in FIG. End up. In other words, it is not possible to determine an optimum tool axis posture in consideration of the curved surface shape of the entire machining target.
FIG. 16 is a schematic diagram of a tool axis posture in which it is easy to ensure rigidity. As shown in FIG. 16, if a tool axis posture with a margin on both the left and right sides can be determined in advance, it is possible to determine tooling with high rigidity.

  Further, in the method described in Patent Document 2, since the tool axis posture is fixed to the Z axis, an optimum tool axis posture is determined for a 4-axis control or 5-axis control NC machine tool. I can't. Furthermore, as a result of avoiding interference, the amount of tool protrusion increases, and a tooling with high rigidity cannot be determined.

  Further, in the method described in Non-Patent Document 1, the calculation of interference is calculated for all combinations of θ and φ in order to obtain the tool axis posture for avoiding interference, so that the calculation load is heavy. In particular, when the number of shape elements such as holders increases, the calculation load increases significantly. Furthermore, since the interference determination is calculated after the tooling is determined, the same problem as in Patent Document 1 remains.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a tool axis attitude determination device that can determine a tool axis attitude and tooling that can easily secure rigidity and that is adapted to a curved surface to be controlled. .
In order to achieve the above-mentioned object, the first invention is a tool / holder based on curved surface dividing means for dividing a curved surface representing a cutting surface of a work material into a plurality of polygons, tool / holder information and tool path information. And the control target curved surface determination means for determining the curved surface to be controlled of the tool axis posture, and the polygon belonging to the curved surface determined by the control target curved surface determination means A curved surface vector calculating means for calculating a curved surface vector having a normal direction as a direction and a size corresponding to the area of the polygon, and a total of the curved surface vectors calculated by the curved surface vector calculating means as a tool axis posture vector, and the tool a tool axis attitude determining means for the orientation of the axis orientation vector determined with the tool axis attitude, the tool axis is determined by the tool axis attitude deciding member Perform interference simulation by energizing a tool axis attitude determination apparatus characterized by comprising: a tooling deciding means for determining a tooling so as to minimize the tool overhang in a range that does not interfere.
A polygon is a polygon used when a three-dimensional shape is expressed in three dimensions. Most are triangles, but here also include polygons other than triangles.

Further, the control target curved surface determination means may designate any curved surface via an input unit.

2nd invention detects the said polygon approaching a tool and a holder based on the step which divides | segments the curved surface showing the cutting surface of a workpiece into a plurality of polygons, tool and holder information, and tool path information, With respect to the polygon belonging to the curved surface determined by the step of determining the curved surface to be controlled of the tool axis posture and the step of determining the curved surface to be controlled, the normal direction of the polygon is oriented, A step of calculating a curved surface vector having a size corresponding to an area; and a sum total of the curved surface vectors calculated by the step of calculating the curved surface vector as a tool axis posture vector, and a direction of the tool axis posture vector as the tool axis posture a step of determining, the interference simulation by said tool axis attitude decided by the step of determining the tool axis position It was carried out, and determining the tooling so as to minimize the tool overhang in a range that does not interfere, a tool axis attitude determination method, which comprises a.

In addition, the step of determining the curved surface to be controlled may specify an arbitrary curved surface via an input unit.

According to a third aspect of the present invention, there is provided the computer , the curved surface dividing means for dividing the curved surface representing the cutting surface of the work material into a plurality of polygons, and the polygon approaching the tool / holder based on the tool / holder information and the tool path information. Control surface determination means for determining the curved surface to be controlled by the tool axis posture, and the polygon belonging to the curved surface determined by the control target curved surface determination means is oriented in the normal direction of the polygon A curved surface vector calculating means for calculating a curved surface vector having a size corresponding to the area of the polygon, and a sum total of the curved surface vectors calculated by the curved surface vector calculating means as a tool axis posture vector, and a direction of the tool axis posture vector Is determined by the tool axis attitude determining means for determining the tool axis attitude and the tool axis attitude determined by the tool axis attitude determining means. Performed Wataru simulation, and tooling determining means for determining a tooling so as to minimize the tool overhang in a range that does not interfere, a program for causing to function.

  According to the present invention, it is possible to provide a tool axis posture determination device that can determine a tool axis posture and tooling that are suitable for a curved surface to be controlled and that can ensure rigidity.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a hardware configuration diagram of a computer that realizes a tool axis posture determining apparatus 1 according to the present embodiment.
The tool axis posture determining apparatus 1 includes a control unit 3, a storage unit 5, a media input / output unit 7, a communication control unit 9, an input unit 11, a display unit 13, a peripheral device I / F unit 15, and the like via a bus 17. Connected.

  The control unit 3 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

The CPU calls and executes a program stored in the storage unit 5, ROM, recording medium, or the like to a work memory area on the RAM, drives and controls each device connected via the bus 17, and a tool axis posture determination device 1 (see FIG. 3, FIG. 7, FIG. 10) described later is performed.
The ROM is a non-volatile memory and permanently holds a computer boot program, a program such as BIOS, data, and the like.
The RAM is a volatile memory, and temporarily stores programs, data, and the like loaded from the storage unit 5, ROM, recording medium, and the like, and includes a work area used by the control unit 3 for performing various processes.

The storage unit 5 is an HDD (hard disk drive), and stores a program executed by the control unit 3, data necessary for program execution, an OS (operating system), and the like. As for the program, a control program corresponding to an OS (operating system) and an application program corresponding to processing described later are stored.
Each of these program codes is read by the control unit 3 as necessary, transferred to the RAM, read by the CPU, and executed as various means.

  The media input / output unit 7 (drive device) inputs / outputs data, for example, floppy (registered trademark) disk drive, PD drive, CD drive (-ROM, -R, RW, etc.), DVD drive (-ROM, -R, -RW, etc.) and a media input / output device such as an MO drive.

  The communication control unit 9 includes a communication control device, a communication port, and the like, and is a communication interface that mediates communication between the computer and the network 19, and performs communication control between other computers via the network 19.

The input unit 11 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad.
An operation instruction, an operation instruction, data input, and the like can be performed on the computer via the input unit 11.

  The display unit 13 includes a display device such as a CRT monitor and a liquid crystal panel, and a logic circuit (such as a video adapter) for realizing a video function of the computer in cooperation with the display device.

  The peripheral device I / F (interface) unit 15 is a port for connecting a peripheral device to the computer, and the computer transmits and receives data to and from the peripheral device via the peripheral device I / F unit 15. The peripheral device I / F unit 15 is configured by USB, IEEE 1394, RS-232C, or the like, and usually has a plurality of peripheral devices I / F. The connection form with the peripheral device may be wired or wireless.

  The bus 17 is a path that mediates transmission / reception of control signals, data signals, and the like between the devices.

Next, the configuration of the tool axis posture determining apparatus 1 will be described with reference to FIG.
FIG. 2 is a schematic configuration diagram of the tool axis posture determination device 1.

  The tool axis posture determining apparatus 1 includes a curved surface shape information input unit 21, a curved surface dividing unit 23, a tool path information input unit 25, a control target curved surface determination unit 27, a curved surface vector calculation unit 29, a tool axis posture determination unit 31, a tooling. A determination means 33, tool axis posture information, tooling information output means 35, and a tool / holder information database 37 are provided.

  The curved surface shape information input means 21 inputs shape information of the curved surface 41 representing the cutting surface of the work material to be cut. As the curved surface shape information, for example, information determined by shape design performed in the CAD system is input. Data may be input via the input unit 11. Further, the media input / output unit 7 may be used. Further, data may be transmitted from another computer via the network 19.

  The curved surface dividing unit 23 divides the curved surface 41 into a plurality of polygons 43 based on the curved surface shape information so that the error is within a specified threshold. Details will be described later with reference to FIG.

  The tool path information input means 25 inputs tool path information, also called CL (Cutter Location) data. The tool path information is information calculated by a CAM system, for example. Data input is the same as the curved surface shape information input means 21.

  The control target curved surface determination means 27 refers to the tool / holder information database 37, detects the polygon 43 approaching the tool / holder based on the tool / holder information and the input tool path information, and determines the tool axis posture. The curved surface 41 to be controlled is determined. Details will be described later with reference to FIGS.

  The curved surface vector calculating unit 29 calculates a curved surface vector 53 having the normal direction of the polygon 43 as the direction and the area of the polygon 43 as the size of the polygon 43 belonging to the curved surface 41 to be controlled. Details will be described later with reference to FIG.

  The tool axis posture determining means 31 sets the sum of the curved surface vectors 53 as the tool axis posture vector 55 and determines the direction of the tool axis posture vector 55 as the tool axis posture. Details will be described later with reference to FIG.

  The tooling determination means 33 performs an interference simulation based on the determined tool axis posture, refers to the tool / holder information database 37, and determines tooling so that the minimum tool protrusion is achieved in a range where no interference occurs. Details will be described later with reference to FIGS. 11, 12, and 13.

  The tool axis posture information / tooling information output means 35 outputs tool axis posture information and tooling information 39. The data output may be displayed on the display device via the display unit 13. Moreover, you may output to the file by a suitable file format. Further, data may be transmitted to another computer via the network 19.

  The tool / holder information database 37 holds, for example, a tool diameter, a tool tip radius, a holder diameter, and the like.

  Next, details of the operation of the tool axis posture determining apparatus 1 will be described with reference to FIGS. 3 to 13.

3, 7, and 10 are flowcharts illustrating the processing procedure of the tool axis posture determining apparatus 1.
FIG. 4 is a schematic diagram showing the curved surface dividing process.
FIG. 5 is a schematic diagram of the spherical inclusion body 49.
FIG. 6 is a schematic diagram illustrating a control target curved surface determination process.
FIG. 8 is a schematic diagram of the curved surface vector 53.
FIG. 9 is a schematic diagram of the tool axis posture vector 55.
11, 12, and 13 are schematic diagrams of interference simulation.

  As shown in FIG. 3, the control unit 3 inputs curved surface shape information (step 101). Here, it is assumed that the curved surface shape information includes a plurality of curved surfaces. This is because a general mold is composed of a plurality of curved surfaces in order to increase the degree of freedom of shape expression.

  Next, the control unit 3 divides all the input curved surfaces 41 into polygons 43 (step 102).

  FIG. 4 shows an example in which four curved surfaces 41 a to 41 d are divided into polygons 43. For example, the control unit 3 increases the number of polygons 43 that divide the curved surface 41 until the error falls within a specified threshold value. The error is the distance between the original curved surface and the polygon 43. As the number of polygons 43 increases, the error decreases. In general, if the shape becomes complicated, the number of polygons 43 increases even with the same threshold value.

  Next, the control unit 3 inputs tool path information (step 103).

  Next, the control part 3 produces | generates the spherical inclusion body 49 containing a tool front-end | tip (step 104).

  As shown in FIG. 5, a spherical inclusion body 49 is generated so as to include the tip of the tool 45. The radius R of the spherical inclusion 49 is set in a range larger than the tool maximum radius Rt (= Dt / 2) and smaller than the holder maximum radius Rh (= Dh / 2). In the case of a ball end mill having a spherical tool tip, the tool maximum radius Rt is equal to the tool tip radius r.

  Next, the control unit 3 sets the spherical inclusion body 49 to the starting position of the tool path 51 (step 105).

  A tool path 51 is determined on the curved surface 41 as shown in the first drawing of FIG. Then, the control unit 3 sets the spherical inclusion body 49 at the start position of the tool path 51.

Next, the control unit 3 confirms whether the spherical inclusion body 49 and the polygon 43 interfere (step 106).
If there is interference, the control unit 3 sets a flag for the interfering polygon 43 (step 107), and proceeds to step 108.
If there is no interference, go to Step 108.

  Next, the control unit 3 advances the spherical inclusion 49 along the tool path 51 by a minute interval (step 108).

  The second diagram of FIG. 6 shows how the spherical inclusion 49 moves along the tool path 51. In order to check whether all the polygons 43 and the spherical inclusions 49 interfere with each other, the control unit 3 advances the spherical inclusions 49 by a minute interval and performs an interference check.

Next, the control unit 3 confirms whether or not the end position of the tool path 51 has been reached (step 109).
If the end position has not been reached, the process is repeated from step 106.
If the end position has been reached, the process proceeds to step 110 shown in FIG.

  The third diagram in FIG. 6 shows a polygon 42 in which a filled portion on a curved surface interferes with a spherical inclusion, and the curved surfaces 41c and 41d include a polygon 43 with a flag set. 41b indicates that the polygon 43 with the flag set is not included. That is, the control target curved surfaces are two curved surfaces 41c and 41d.

  Note that the control target curved surface may be determined by designating an arbitrary curved surface 41 via the input unit 11 without performing the processing of steps 104 to 109. If a place where there is a possibility of interference can be predicted, the processing can be simplified by not performing the processing of steps 104 to 109.

  Next, as shown in FIG. 7, the control unit 3 extracts all the curved surfaces 41 including at least one polygon 43 for which a flag is set (step 110).

  Next, the control unit 3 initializes an area for storing the total sum of the curved surface vectors 53 (step 111). The area for storing the sum total of the curved surface vector 53 holds the X component, Y component, and Z component of the three-dimensional vector.

  Next, the control unit 3 determines a polygon 43 belonging to the extracted curved surface 41 (step 112). For example, an identification ID is attached to the polygon 43 together with information associated with the curved surface 41, and is determined in the order of the identification ID.

  Next, the control unit 3 calculates the curved surface vector 53 of the determined polygon 43 (step 113).

  FIG. 8 shows a curved surface vector 53 extracted from some polygons 43. The curved surface vector 53 is the product of the unit normal vector of the target polygon 43 and the area of the target polygon 43. That is, the curved surface vector 53 is a three-dimensional vector whose direction is the normal direction of the polygon 43 and whose size is the area of the polygon 43.

  Next, the control unit 3 adds the total sum of the curved surface vectors 53 to the area for storing (step 114). That is, a value obtained by adding the value of the area for storing the total sum of the curved surface vectors 53 and the value of the curved surface vector 53 is held in the area for newly storing the total sum of the curved surface vectors 53.

Next, the control unit 3 confirms whether the processing has been completed for all the polygons 43 belonging to the extracted curved surface 41 (step 115).
If the processing has not been completed for all the polygons 43, the processing is repeated from step 112.
If all polygons 43 have been processed, the process proceeds to step 116.
The total sum of the curved surface vectors 53 is all the polygons 43 belonging to the extracted curved surface 41, but may be the total sum of the curved surface vectors 53 of the polygons 43 flagged in step 107.

  Next, the controller 3 determines the sum of the curved surface vectors 53 as the tool axis posture vector 55 (step 116).

FIG. 9 is a two-dimensional illustration of the curved surface vector 53 and the tool axis posture vector 55 that is the sum of the curved surface vectors 53. It can be seen that the direction of the tool axis posture vector 55 is a safe direction in which interference does not easily occur throughout the tool path 51. Further, it can be seen that the direction of the tool axis posture vector 55 is a direction in which the interference margin is not biased and the rigidity is easily secured.
The size of the tool axis posture vector 55 can be a safety indicator that is unlikely to cause tool interference. That is, it can be determined that the larger the size, the safer.

  Next, as shown in FIG. 10, the control unit 3 generates a virtual holder 59 (step 117).

  The initial shape of the virtual holder 59 is, for example, a size that includes the portion other than the cutting edge 57 of the tool 45 and the maximum diameter of the holder 47. With this shape, the protruding amount of the tool 45 is minimized and the tooling is highly rigid.

  Next, the control unit 3 sets the virtual holder 59 to the start position of the tool path 51 (step 118).

  In FIG. 11, the virtual holder 59 is set at the start position of the tool path 51. The tool axis posture maintains the same direction up to the end position of the tool path 51 according to the direction of the tool axis posture vector 55 determined in step 116.

Next, the control unit 3 confirms whether the virtual holder 59 and the curved surface 41 interfere (step 119).
If there is interference, the interfering portion of the virtual holder 59 is deleted (step 120) and the process proceeds to step 121.
If there is no interference, the process proceeds to step 121.

  FIG. 12 illustrates the interference between the virtual holder 59 and the curved surface 41. The interference part is calculated by a set operation, and the shape excluding the interference part is held as a new virtual holder 59 shape.

Next, the control unit 3 confirms whether or not the end position of the tool path 51 has been reached (step 121).
If the end position has not been reached, the process is repeated from step 119.
If the end position has been reached, the process proceeds to step 122.

  Next, the control unit 3 determines the tooling that provides the minimum tool protrusion amount based on the shape of the virtual holder 59 that remains without being deleted (step 122).

  In FIG. 13, the virtual holder 59 has reached the end position of the tool path 51. The shape of the virtual holder 59 is such that the interference part is deleted every time there is interference, so that the tooling included in the remaining shape does not interfere with the curved surface 41. Therefore, a tooling that does not easily interfere can be determined. Furthermore, by determining the tooling so that the minimum tool protrusion amount is obtained, it is possible to determine a tooling with high rigidity.

As described above in detail, according to the embodiment of the present invention, the curved surface 41 is divided into polygons 43, and the spherical inclusion body 49 including the tool tip is moved along the tool path 51 to detect interference. Thus, the control target curved surface is determined, the sum of the curved surface vectors 53 of the polygons 43 included in the control target curved surface is calculated, and the tool axis posture vector 55 is determined.
Further, the tool axis orientation 55 is set as the tool axis orientation, and the interference simulation is performed to determine the tooling so that the minimum tool protrusion amount is obtained in the range where no interference occurs.

According to the embodiment of the present invention, it is possible to determine a safe tool axis posture in which interference does not easily occur through the entire tool path 51 and a tool axis posture in which the interference margin is not biased and the rigidity is easily secured before the tooling is determined. .
Furthermore, interference is unlikely to occur, and by determining an optimum tool axis posture in order to ensure rigidity, it is possible to determine tooling that does not cause interference and has high rigidity.
Furthermore, if tooling is determined after determining the tool axis attitude, the interference simulation is performed once, so that the tooling determination process is greatly simplified.
And by determining a tooling with high rigidity, there is no worry of tool breakage even if the feed rate of the tool is increased, and thus the cutting efficiency is improved. Further, by determining a tooling having high rigidity, chatter occurring during machining can be suppressed, and the quality of the cutting surface is improved.

  The tooling determination process is not limited to the embodiment of the present invention. Several mechanisms have already been known for determining tooling in which the tool axis posture is fixed and interference does not occur. The tooling determination process is not limited as long as the tool axis posture is fixed and the tooling that provides the minimum tool protrusion amount within a range where no interference occurs can be determined.

  Also, the program for performing the processing shown in FIGS. 3, 7, and 10 may be distributed on a recording medium such as a CD-ROM, or may be transmitted / received via a communication line.

  The preferred embodiments of the tool axis posture determination device and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

Hardware configuration diagram of a computer for realizing the tool axis posture determining device 1 Schematic configuration diagram of the tool axis posture determination device 1 The flowchart which shows the process sequence of the tool axis attitude | position determination apparatus 1. Schematic diagram showing curved surface division processing Schematic diagram of spherical inclusion 49 Schematic diagram showing the controlled surface determination process The flowchart which shows the process sequence of the tool axis attitude | position determination apparatus 1. Schematic diagram of curved surface vector 53 Schematic diagram of tool axis attitude vector 55 The flowchart which shows the process sequence of the tool axis attitude | position determination apparatus 1. Schematic diagram of interference simulation Schematic diagram of interference simulation Schematic diagram of interference simulation Schematic diagram showing interference between holder 47 and curved surface 41 Schematic representation of tool axis posture after interference avoidance Schematic diagram of the tool axis posture that makes it easy to ensure rigidity

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Tool axis attitude | position determination apparatus 3 ......... Control part 5 ......... Storage part 7 ......... Media input / output part 9 ......... Communication control part 11 ......... Input part 13 ......... Display part 15 ... ...... Peripheral device I / F section 17 ......... Bus 19 ......... Network 41 ......... Curved surface 42 ......... Polygon 43 that interferes with spherical inclusion 43 ......... Polygon 45 ......... Tool 47 ......... Holder 49 ......... Spherical inclusion 51 ......... Tool path 53 ......... Curved surface vector 55 ......... Tool axis orientation vector 57 ......... Cutting edge 59 ......... Virtual holder

Claims (5)

Curved surface dividing means for dividing the curved surface representing the cutting surface of the work material into a plurality of polygons;
Control target curved surface determining means for detecting the polygon approaching the tool / holder based on the tool / holder information and the tool path information, and determining the curved surface to be controlled of the tool axis posture;
A curved surface vector calculating means for calculating a curved surface vector having a size corresponding to an area of the polygon with respect to the polygon belonging to the curved surface determined by the controlled surface determining means;
Tool axis posture determining means for determining the sum of the curved surface vectors calculated by the curved surface vector calculating means as a tool axis posture vector and determining the direction of the tool axis posture vector as the tool axis posture;
Tooling determining means for performing an interference simulation based on the tool axis attitude determined by the tool axis attitude determining means, and determining tooling so as to provide a minimum tool protrusion within a range in which no interference occurs;
A tool axis attitude determination device comprising:   The tool axis attitude determination apparatus according to claim 1, wherein the control target curved surface determination means specifies an arbitrary curved surface via an input unit. Dividing the curved surface representing the cutting surface of the work material into a plurality of polygons;
Detecting the polygon approaching the tool / holder based on the tool / holder information and the tool path information, and determining the curved surface to be controlled by the tool axis posture;
For the polygon belonging to the curved surface determined by the step of determining the curved surface to be controlled, the normal direction of the polygon is oriented, and a curved surface vector having a size corresponding to the area of the polygon is calculated;
Determining the sum of the curved surface vectors calculated by calculating the curved surface vector as a tool axis posture vector, and determining the direction of the tool axis posture vector as the tool axis posture;
Performing an interference simulation with the tool axis attitude determined by the step of determining the tool axis attitude, and determining tooling so as to provide a minimum tool protrusion within a range in which no interference occurs;
A tool axis posture determination method comprising: The method for determining a tool axis posture according to claim 3 , wherein the step of determining the curved surface to be controlled is to designate an arbitrary curved surface via an input unit. The computer,
Curved surface dividing means for dividing the curved surface representing the cutting surface of the work material into a plurality of polygons;
Control target curved surface determining means for detecting the polygon approaching the tool / holder based on the tool / holder information and the tool path information, and determining the curved surface to be controlled of the tool axis posture;
A curved surface vector calculating means for calculating a curved surface vector having a size corresponding to an area of the polygon with respect to the polygon belonging to the curved surface determined by the controlled surface determining means;
Tool axis posture determining means for determining the sum of the curved surface vectors calculated by the curved surface vector calculating means as a tool axis posture vector and determining the direction of the tool axis posture vector as the tool axis posture;
Tooling determining means for performing an interference simulation based on the tool axis attitude determined by the tool axis attitude determining means, and determining tooling so as to provide a minimum tool protrusion within a range in which no interference occurs;
Program for to function.

Images