JP2005334987A - Flattening tool selecting device and flattening tool selecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flattening tool selecting device which carries out the selection of a flattening tool, which requires machining experiences of skilled operators, so that an optimal machining tool that minimizes an uncut area and has a suitable diameter is automatically selected, and also to provide a flattening tool selecting method. <P>SOLUTION: The flattening tool selecting device is comprised of a replacing means for replacing a plane section to be machined by a plurality of unit squares having the same area, and a selecting means (a machining program in a hard disk drive 5) for selecting the machining tool that minimizes an uncut ratio when the plane section replaced by the unit square is cut. The selecting means has the function of comparing the area of the unit squares with a projected area of a candidate tool in a tool axial direction, and the function of selecting the machining tool having a radius that is set such that a cuttable area ratio is equal to or more than a value designated from outside. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

In the present invention, when acquiring data of a three-dimensional shape model to be processed and automatically designing a processing step for the three-dimensional shape model, the finished shape of the processing is a flat surface portion having at least one wall portion around it. The present invention relates to a planar machining tool selection device and a machining tool selection method for automatically selecting a machining tool to be used in a machining process.

§1: Conventional example 1
In recent years, there has been a remarkable spread of 3D CAD / CAM, and the system has become more sophisticated and diversified. However, there is almost no system that automatically selects a machining tool suitable for the machining shape. Even in a CAM system having a slight automatic tool selection function, there are many cases where a tool to be used is compared with a machining surface and a predetermined tool is assigned when there is a corresponding machining surface.

§2: Conventional example 2
FIG. 9 is an explanatory diagram of the second conventional example. Hereinafter, Patent Document 1 will be described as a second conventional example. Conventional example 2 relates to an NC machining data generation apparatus in a CAD apparatus, which reduces NC programming burden and generates NC machining data with excellent machining efficiency and machining accuracy.

  In this apparatus, information on the tool to be used is registered in the tool library 4 in advance, and when creating NC machining data, the tool trajectory generation unit 3 first performs rough machining with a large machining tool that it owns. The tool to be used and the tool path are determined, and the tool to be used and the tool path are determined so that fine machining is performed with a small processing tool owned next.

  The selection of the tool and the tool trajectory are determined by the apparatus based on the used tool information registered in the tool library 4. Thereby, an efficient machining condition using the optimum tool can be given.

§3: Conventional example 3
FIG. 10 is an explanatory diagram of Conventional Example 3. Hereinafter, Patent Document 2 will be described as Conventional Example 3. Conventional Example 3 relates to a machining condition setting system, and enables machining with a preset accuracy.

  This conventional example 3 includes a tool database 18 that stores tool information and a machining condition database 19 that stores machining conditions for each tool, and sets the machining type and machining accuracy of the designated machining area. It designates in the means 12.

  Then, the tool selection unit 16 refers to the tool database 18 to select a machining process setting and a tool corresponding to the set machining process from the machining area, the machining type, and the machining accuracy. Then, the machining conditions of the selected tool are set by using the machining condition setting means 17 and referring to the machining condition database 19. That's it.

§4: Conventional example 4
FIG. 11 is an explanatory diagram of Conventional Example 4, and Patent Document 3 will be described as Conventional Example 4 below. Conventional example 4 relates to a processing information automatic creation / evaluation apparatus, which automatically creates and evaluates various processing information, and automatically changes and sets the created processing information when the evaluation does not satisfy a predetermined condition.

And this processing information automatic creation evaluation device extracts a processing part from a product shape and a rough material shape, a processing part determination unit 1 for determining a processing shape, and a tool for processing into the determined processing shape. A tool determination unit 2 having at least one of a tool selection unit 21 to select and a tool design unit 22 to design a tool; a machining condition determination unit 3 to determine a processing condition of a selected or designed tool; and a tool path The machining time calculation unit 4 that calculates the machining time from the determined machining conditions and the created tool path, and each of the determination units 1, 2, 3, so that the calculated machining time becomes a target value. , And a feedback processing unit 5 that automatically corrects at least one of the machining information determined by the machining time calculation unit 4 and feeds back to the corresponding determination units 1, 2, 3, and the machining time calculation unit 4.
JP-A-6-274219 JP-A-6-335840 JP-A-11-129141

(1): As described in Conventional Example 1, conventionally, there is almost no system that automatically selects a machining tool suitable for a machining shape. Many CAM systems having a slight automatic tool selection function take a comparison between a tool to be used in advance and a machining surface and assign a predetermined tool when there is a corresponding machining surface.

  (2): Conventional example 2 temporarily specifies a large tool database prepared in advance for a given contour shape, generates a tool trajectory, and determines the next tool. On the other hand, the present invention does not require the work as in the conventional example 2, and the present invention differs from the conventional example 2 in this respect.

  (3) In Conventional Example 3, what kind of processing is performed on the processing plane is given as an attribute, and a process and a tool are determined from a processing condition database prepared in accordance with the attribute. As described above, in Conventional Example 3, it is necessary to set an attribute on the machining surface, which is troublesome. However, in the present invention, the labor-related work as described above is unnecessary, and the present invention is different from Conventional Example 3 in this respect.

  (4): Conventional Example 4 is a method of searching for a suitable one by comparing the machining shape and the tool dimension parameter in the tool database. On the other hand, the present invention does not perform comparison as in the conventional example 4, and both are different in this respect.

  The present invention solves the above-described conventional problems, and makes it possible to automatically select a machining tool having an appropriate diameter while minimizing a remaining portion when selecting a planar machining tool that requires machining experience. For the purpose.

(1): When acquiring data of a 3D shape model to be processed and automatically designing a processing process for the 3D shape model, the finished shape of the processing has at least one wall portion around it. Is a plane machining tool selection device that automatically selects a machining tool to be used in a machining process for the above-described plane, and replaces the plane portion to be machined with a plurality of unit squares having the same area (one of the machining programs). Part) and tool selection means (part of the machining program) for selecting a machining tool having a minimum unremoved ratio when cutting the plane part replaced with the unit square, the tool selection means When determining the uncut stock ratio, the unit square area is compared with the projected area in the tool axis direction of the candidate tool, and the value of the cuttable area ratio is greater than or equal to the specified value specified from the outside. It has a function of selecting a machining tool having such a radius.

  (2): In the planar machining tool selection apparatus according to (1), the tool selection means assumes a plurality of candidate tool circles in contact with the unit square, and calculates a unit square area and a plurality of candidate tool projected areas. An area comparison function for comparison, and a machining tool selection function for selecting a machining tool having a radius such that the ratio of the cuttable area is equal to or greater than a predetermined value given from the outside by comparing the areas, and cutting of the machining tool It is characterized by having a function of reducing the load and the uncut portion of the machining tool.

  (3): In the planar machining tool selection apparatus according to (1) or (2), the tool selection means selects a tool by narrowing down the tools in the machining tool library in advance by performing an interference check with a machining shape. And when there is no candidate tool that satisfies the condition in the tool library, the tool diameter is a tool diameter that can be machined, and a display function that displays a non-interfering holder or protruding length on the screen is provided. And

  (4): When acquiring data of a 3D shape model to be processed and automatically designing a processing process for the 3D shape model, processing for a flat portion having a finished shape of at least one wall around it A planar machining tool selection method for automatically selecting a machining tool to be used in a process, wherein the planar part to be machined is replaced with a plurality of unit squares having the same area (a part of a machining program). And a tool selection procedure (part of the machining program) for selecting a machining tool that minimizes the unremoved ratio when cutting the plane portion replaced with the unit square. The procedure is to compare the unit square area and the projected area in the tool axis direction of the candidate tool when determining the uncut portion ratio, and the value of the cuttable area ratio is greater than or equal to the specified value specified from the outside. A processing tool having a radius such that becomes is selected.

  (5): In the planar machining tool selection method according to (4), an area comparison procedure for comparing a unit square area and a plurality of candidate tool projected areas assuming a plurality of candidate tool circles in contact with the unit square ( A part of the machining program) and a machining tool selection procedure (of the machining program) for selecting a machining tool having a radius such that the ratio of the cuttable area is equal to or greater than a predetermined value given from the outside. The cutting load of the processing tool and the uncut residue of the processing tool are reduced by a part of the procedure.

(Function)
FIG. 1 is a diagram illustrating the principle of the present invention. The operation of the present invention will be described below with reference to FIG.

  (a): In the above (1), the planar machining tool selection device (planar machining tool selection device main body 1A and its peripheral devices) acquires the data of the three-dimensional shape model to be processed (acquired from CAD or the like), and When automatically designing a machining process for a three-dimensional shape model, a machining tool to be used in a machining process for a planar part having a finished shape at least one wall around is automatically selected.

Then, the replacement means (part of the processing program in the hard disk device 5) replaces the plane portion to be processed with a unit square having the same area, and the tool selection means (part of the processing program in the hard disk device 5). ) Selects a tool having a minimum unremoved ratio when cutting a plane portion replaced with a unit square. The tool selection means compares the unit square area with the projected area in the tool axis direction of the candidate tool when determining the uncut portion ratio, and the value of the cuttable area ratio is a designated value designated from the outside. Select a machining tool with such a radius. (The same effect as in (4) above)
(b): In (2), the tool selection means is in contact with the unit square and assumes a plurality of candidate tool circles, and compares the unit square area with the plurality of candidate tool projected areas. Further, in the comparison of the areas, a machining tool having a radius such that the cuttable area ratio is equal to or greater than a predetermined value given from the outside is selected. (The same effect as in (5) above)
(c): In the above (3), the tool selection means selects a tool in advance by narrowing down the tools in the tool library (the tool database in the hard disk device 5) by the interference check with the machining shape, and the tool. When there is no candidate tool that satisfies the condition in the library, a tool diameter capable of machining the flat portion and a holder or protruding length that does not interfere are displayed on the screen (screen of the display device 2).

(1): Since the machine automatically selects a machining tool for plane machining based on objective judgment criteria, it can be finished into a workpiece that does not vary in quality even if an unspecified number of operators perform machining. it can.

  (2): Since the side length in accordance with the tool diameter used for machining can be set, the machining tool can be selected in a shorter processing time than when the side length is set with a small number.

  (3): Since the tool diameter with the least amount of uncut material can be determined from the area ratio, the machine automatically selects a machining tool suitable for the machining surface without selecting a tool diameter based on vague experience and judgment. It becomes possible to do.

  (4): It is possible to prevent thrusting by a dangerous end mill after processing.

  (5): Since the upper and lower limits of usable tools are determined by the interference check and protrusion length, extremely small machining tools and large machining tools are excluded from the shape, and efficient and appropriate machining tools can be used. You can choose.

  (6): In the selection of a plane machining tool, it is possible to minimize the uncut portion and automatically select a machining tool with an appropriate diameter. Variations in machining quality due to differences in tool selection can be reduced.

  In addition, it is possible to prevent tool selection mistakes due to lack of operator experience. Furthermore, there is no need to generate a tool trajectory and the user does not need to give the machining type as an attribute to the machining target.

§1: Description of plane machining tool selection device FIG. 2 is a block diagram of the device. Hereinafter, the configuration of the planar machining tool selection device will be described with reference to FIG.

  This planar machining tool selection device is a device realized by an arbitrary computer such as a personal computer or a workstation, and includes a computer main body 1, a display device (display device) 2 connected to the computer main body 1, a keyboard, a mouse, and the like. Input device 3, removable disk drive (RDD) 4, hard disk device (HDD) 5, and the like.

  The computer main body 1 includes a CPU 6 that performs various controls, a ROM 7, a work memory 8, an interface control unit (I / F control unit) 9 that performs interface control for peripheral devices, a LAN, and others. A communication control unit 10 for performing communication control with respect to the external device is provided.

  The hard disk (recording medium or storage medium) of the hard disk device (HDD) 5 stores a machining program (NC program creation program), a tool library database, a CAD program, other application programs, and the like. .

  The machining program (NC program creation program) is a program for executing a machining tool selection process of the machining tool selection device of the present invention. The tool library database stores in advance tool data necessary for machining tool selection processing. The CAD program is a program for performing CAD processing. Therefore, the machining program (NC program creation program) performs machining tool selection processing by performing processing while referring to the data in the tool library database. At this time, a processing result by the CAD program is also acquired (details will be described later).

  When performing a machining tool selection process, an instruction is issued from the input device 3, and a program to be executed by the CPU 6 is sequentially extracted from the machining program (NC program creation program) stored in the hard disk device 5 and executed. At the same time, the processing tool selection process is performed by referring to the data in the tool library database during the execution.

  The processing outline of the plane machining tool selection device (computer) is as follows.

  (a): The machining program of the planar machining tool selection device is, for example, when acquiring the data of a 3D shape model to be machined from CAD (CAD program) and automatically designing the machining process for the 3D shape model. The machining tool to be used in the machining process is automatically selected in the machining process for the flat part having at least one wall around the finished shape when machining.

In this case, the machining program replaces the plane portion to be machined with a unit square having the same area, and selects a tool that minimizes the unremoved ratio when cutting the plane portion replaced with the unit square. When determining the uncut portion ratio at that time, the unit square area and the projected area in the tool axis direction of the candidate tool are compared, and the cuttable area ratio = (x ² −4 × 0.215r ² ) ÷ (x ² ) Select a machining tool with a radius such that the value of) is greater than or equal to the specified value specified from the outside.

  (b): The machining program assumes a plurality of candidate tool circles in contact with the unit square, compares the unit square area and the plurality of candidate tool projected areas, and the ratio of the cuttable area is determined by comparing the areas. By selecting a machining tool having a radius that is equal to or greater than a predetermined value given from the outside, the cutting load of the machining tool and the uncut portion of the machining tool are reduced.

  (c): The machining program selects the machining tool by narrowing down the tools in the tool library in advance by checking the interference with the machining shape, and if there is no candidate tool that satisfies the conditions in the tool library, the plane A holder or protrusion length that has a tool diameter capable of machining the part and does not interfere is displayed on the screen of the display device 2 to notify an operator or the like.

  In the planar machining tool selection process, a program stored (recorded or stored) in a hard disk (recording medium or storage medium) of the HDD 5 in advance is read out under the control of the CPU 6, and the program read out by the CPU 6 is executed. However, the present invention is not limited to such an example. For example, the program can be stored in the hard disk of the HDD 5 as follows, and the CPU 6 can execute the program to execute the processing. It is.

  a: A program (program data created by another device) stored in a flexible disk (floppy disk) created by another device is read by the RDD 4 and stored in the hard disk of the HDD 5.

  b: Data stored in a storage medium such as a magneto-optical disk or CD-ROM is read by the RDD 4 and stored in the hard disk of the HDD 5.

  c: Data such as a program transmitted from another apparatus via a communication line such as a LAN is received via the communication control unit 10 and the data is stored in the hard disk of the HDD 5.

§2: 3D model of cutting object and description of cutting process FIG. 3 is an explanatory diagram of the processing (part 1), FIG. 4 is an explanatory diagram of the processing (part 2), and FIG. 5 is an explanatory diagram of the processing (part 3). It is. Hereinafter, a case of a three-dimensional shape model (hereinafter, also simply referred to as “three-dimensional model”) of a cutting target having cutting target surfaces A, B, and C will be described with reference to FIGS.

  Note that the CAD program in the hard disk device 5 shown in FIG. 2 is stored in another device, and even if the CAD device is configured as another device, the necessary data from the other CAD device is arbitrary. The present invention can be realized as long as it can be acquired.

(1): Explanation of Example 1 (see FIG. 3)
In FIG. 3, a plane part to be processed (the whole is a planar shape) is shown, and a wall part to be checked for interference and protrusion length is formed around it. In other words, there is a planar portion to be processed that has a finished shape that has at least one wall portion around it.

Now, the plane portion to be processed is divided into a plurality of unit squares. In this case, if the area of each unit square is A and the length of one side is 2r, then A = 4r ² (r is the square root of A / 4). Also, the area of the unit square is the radius of the inscribed circle of the unit square = r, and the area of the inscribed circle = πr ² . The area of the inscribed circle inscribed in the unit square is a theoretically workable range.

  In Example 1, when the data of the three-dimensional shape model of the object to be processed is acquired, and the processing step for the three-dimensional shape model is automatically designed, the finished shape when processed is a plane having at least one wall around it. The processing tool used in the machining process for the part is automatically selected.

In this case, the plane part to be machined is replaced with a unit square having the same area, and a tool having a minimum unremoved ratio when cutting the plane part replaced with the unit square is selected. At this time, when determining the uncut portion ratio, the area of the unit square (length of one side = x) and the projected area in the tool axis direction of the candidate tool are compared, and the cuttable area ratio = (x ² −4 × 0.215r ² ) ÷ x ² (When this value is multiplied by 100, the unit of the answer is%.) A processing tool for selecting a machining tool having a radius that is equal to or greater than the specified value specified from the outside is performed. .

In the above processing, since the machining time can be shortened if the machining is theoretically performed as little as possible, a circle inscribed in the unit square is set on the assumption that the machining tool can be machined by one operation in the tool axis direction. . This is assumed to be the range of movement that can be taken by the tool when the movement is the smallest, and the machining time is the shortest and the remaining uncut is the smallest. At this time (there is a relationship of x = 2r, and the circle is inscribed in the four sides of the unit square), the workable range ratio is (area of the inscribed circle) / (unit square area) = πr ² / 4r ² = 0.7853 (range of cutting). When selecting a machining tool, a machining tool having a machining range ratio larger than this ratio is selected (a machining tool that is in contact with the square and has a diameter smaller than the inscribed circle radius r is used).

(2): Explanation of Example 2 (see Fig. 4)
In the theoretical workable range shown in FIG. 3, since the machining tool only moves up and down (in the tool axis direction), the load increases in the end mill tool. Further, generally, a flat tool has a slight angle at the bottom, and an uncut portion corresponding to the angle is generated only by the vertical movement. Therefore, in order to reduce the load and eliminate the uncut portion at the bottom, as shown in FIGS. 4A and 4B, machining is performed by moving the tool diameter at the shortest (moving in the direction indicated by the arrow). Think about the case.

  In Example 2, when the tool selection is performed in Example 1, a unit square area is compared with a plurality of candidate tool projected areas, assuming a plurality of candidate tool circles in contact with the unit square. Further, in the comparison of the areas, a machining tool having a radius such that the cuttable area ratio is equal to or greater than a predetermined value given from the outside is selected. In this way, the cutting load of the processing tool and the uncut residue of the processing tool are reduced.

In FIG. 4A and FIG. 4B, a unit square of area = x ² is shown. When processing the unit square, when considering the movement of the tool diameter, four circles (radius = r) in contact with the square and adjacent circles can be assumed in the unit square. 4A is an example in which inscribed circles overlap in a unit square, and FIG. 4B is an example in which four inscribed circles contact each other without overlapping in a unit square.

At this time (when there is a relationship of x = 4r shown in FIG. 4), the cuttable range ratio is (x ² −4 × 0.215r ² ) ÷ x ² = 0.9463. Therefore, if a radius tool whose machining range is equal to or less than this ratio is selected, it is possible to eliminate the bottom shaving residue with the minimum movement distance. The movement of the processing tool is in the direction of the arrow in FIG.

(3): Explanation of Example 3 (see FIG. 5)
In Examples 1 and 2, it is possible to select a machining tool that minimizes the machining time and minimizes uncut material. However, only with this process, the smaller the tool diameter, the better. However, in practice, there is a limit to the tool diameter, and interference with a deep part of the shape or surroundings may occur. Therefore, an interference check with the protrusion length and holder diameter that can be processed in a deep place is usually performed, and a processing tool that can be processed safely is selected.

  That is, in the tool selection process, tools are selected by narrowing down the tools in the tool library stored in advance in the hard disk device (HDD) 5 by the interference check with the machining shape. In addition, when there is no candidate tool that satisfies the conditions in the tool library, a tool diameter capable of machining the flat portion and a holder or protruding length that does not interfere are displayed on the screen of the display device 2 and notified to the operator or the like. To do. Hereinafter, the tool selection process will be further described in detail with reference to FIG.

(a): Explanation of interference Although a small-diameter tool can reduce uncut material, the protruding length cannot be increased, so that the holder portion may interfere with the surrounding shape as shown in FIG. When the holder interferes, there is a method to avoid by extending the protrusion with the same tool, or by changing to a machining tool that can make a larger protrusion, the former is disadvantageous as a processing condition, so take the latter measure There are many cases.

  In the case of a change that extends the protrusion, the tool diameter is generally increased if the machining tool is the same type. To change the machining tool, select a tool with a nominal diameter (tool diameter) that is one larger than the machining tool that reduces the most uncut material obtained up to Example 2, and perform the same interference check. If not, use the machining tool. When interference occurs in this way, the same process is repeated with a tool having a larger nominal diameter (tool diameter) until the interference disappears.

(b): Explanation of tools in the library A tool database is stored in the hard disk device 5 in advance. A machining tool (tool data) as a selection candidate is taken out from the tool database, and the protrusion and interference check are performed. In this case, do as follows.

φ1 ← Tool with the least amount of uncut residue, protruding interference check is NG
φ3 ← Tool with the least remaining shavings, protruding interference check is OK. Adopted as a flat machining tool φ4
φ6
By performing this protrusion interference check, it is possible to place a constraint that does not select an extremely large tool or an extremely small tool, so select a tool that is as large as possible within the constraint and minimizes uncut material. be able to.

§3: Explanation of processing of plane machining tool selection device FIG. 6 is a processing flowchart (part 1) of the device, FIG. 7 is a processing flowchart of the device (part 2), and FIG. 8 is a processing flowchart of the device (part 3). Hereinafter, processing of the planar machining tool selection device will be described with reference to FIGS. 6 to 8, S1 to S25 indicate each processing step.

  The following processes are all realized by the CPU 6 executing the machining program (NC program creation program) in the hard disk device 5 shown in FIG. Further, the term “CAD function” used in the following description is a function realized by the CPU 6 executing a CAD program in the hard disk device 5.

(1): Process 1 (see Fig. 6)
The machining program first calculates the area of the machining surface (S1). In this process, the area of the planar portion to be processed (see FIG. 3) is calculated by a function prepared in advance for the CAD function. Then, the calculated CAD data is acquired by the planar machining tool selection device. Next, a unit square (see FIG. 3) is set (S2). In this process, a square is set which takes the square root of the area acquired in the process of S1 and uses this as the length of one side.

  Next, an inscribed circle is set (S3). In this process, an inscribed circle that touches the four sides of the square obtained in the process of S2 is set. This process is completed as described above.

(2): Process 2 (see Fig. 7)
The machining program first calculates the area of the machining surface (S11). In this processing, the area of the planar portion to be processed is calculated by a function prepared in advance for the CAD function, and the data is acquired. Next, a unit square is set (S12). In this process, a square is set which takes the square root of the area acquired in the process of S1 and uses this as the length of one side.

  Next, a circle inscribed in the square with the minimum movement amount is set (S13). In this process, an inscribed circle that always contacts at least one square with the square obtained in the process of S12 is set with a minimum movement amount that does not cause uncut residue in the tool moving unit. Next, a predetermined threshold (user-specified threshold) is compared with the tool movement area (S14). In this process, the threshold value and the moving part area are compared, and if the condition of (threshold value) ≦ (moving part area) is satisfied, the process proceeds to S15. If the condition of (threshold value) ≦ (moving part area) is not satisfied, S16 is performed. Move on to processing.

  Next, in the process of S16, one smaller circle is reset, and the process proceeds to S13. In this case, a tool having a diameter smaller than that of the tool library (stored in the hard disk device 5) is selected for those that cannot be processed beyond the threshold. In the process of S15, the tool is selected as a tool candidate, and this process ends. In this process, a machining tool that can be machined beyond the threshold is selected as a candidate.

(3): Process 3 (see FIG. 8)
First, the machining program arranges the candidate tool so as to contact the machining surface boundary (S21). In this process, the candidate tool obtained in the process of FIG. 7 is arranged so as to be in contact with the machining surface boundary (contour line). Next, it moves on the processing surface boundary while keeping in contact (S22). In this process, one or more rounds are moved on the machining boundary while in contact.

  Next, an interference check with a surface other than the processed surface is performed (S23). In this process, it is confirmed whether or not it interferes with a shape (surface) other than the processed surface during movement. The interference detection method may use a CAD function. If there is no interference, the process proceeds to S24, and if there is interference, the process proceeds to S25.

  In the process of S24, the tool to be used is determined, and this process ends. In the process of S25, a tool having a smaller diameter is set, and the process of S21 is parallel. In this process, a tool whose diameter is smaller by one than the candidate tool acquired in the process of FIG. 7 is selected again from the tool library database. If the tool to be selected is not in the tool library database, this is notified and the recommended protrusion length is displayed on the screen.

(Appendix)
The following configuration is appended to the above description.

(Appendix 1)
When acquiring 3D shape model data and automatically designing the machining process for the 3D shape model, the machining used in the machining process for the flat part of the shape with the finished shape having at least one wall around it A plane machining tool selection device for automatically selecting a tool,
Replacement means for replacing the plane part to be processed with a unit square of the same area,
Tool selection means for selecting a machining tool that minimizes the unremoved ratio when cutting the plane portion replaced with the unit square,
The tool selection means compares the unit square area and the projected area in the tool axis direction of the candidate tool when determining the uncut portion ratio, and the value of the cuttable area ratio is greater than or equal to a specified value specified from the outside. A plane machining tool selection device having a function of selecting a machining tool having a radius as described above.

(Appendix 2)
The tool selection means includes
An area comparison function that compares the unit square area with a plurality of candidate tool projection areas, assuming a plurality of candidate tool circles in contact with the unit square;
In the comparison of the areas, it has a processing tool selection function for selecting a processing tool having a radius such that the cuttable area ratio is equal to or greater than a predetermined value given from the outside,
The planar machining tool selection device according to appendix 1, which has a function of reducing a cutting load of the machining tool and an uncut portion of the machining tool.

(Appendix 3)
The tool selection means includes
A function to select a machining tool by narrowing down the tools in the tool library in advance by checking interference with the machining shape,
When there is no candidate tool that satisfies the condition in the tool library, a display function for displaying on the screen the holder diameter or the projection length that does not interfere with the tool diameter that can machine the plane part,
The planar machining tool selection device according to supplementary note 1 or supplementary note 2, characterized by comprising:

(Appendix 4)
When acquiring data of a three-dimensional shape model to be processed and automatically designing a processing step for the three-dimensional shape model, the finished shape of the processing is a processing step for a plane portion having a shape having at least one wall around it. A plane machining tool selection method for automatically selecting a machining tool to be used,
Replacement procedure to replace the plane part to be processed with a unit square composed of squares of the same area,
A tool selection procedure for selecting a processing tool that minimizes the unremoved ratio when cutting the plane portion replaced with the unit square,
The tool selection procedure compares the unit square area with the projected area in the tool axis direction of the candidate tool when determining the uncut portion ratio, and the value of the cuttable area ratio is greater than or equal to the specified value specified from the outside. A plane machining tool selection method comprising: selecting a machining tool having a radius such that

(Appendix 5)
An area comparison procedure for contacting the unit square and assuming a plurality of candidate tool circles and comparing the unit square area and the plurality of candidate tool projected areas;
By comparing the above areas, the cutting load of the machining tool and the uncut residue of the machining tool are reduced by the machining tool selection procedure for selecting a machining tool with a radius such that the cutable area ratio is equal to or greater than a predetermined value given from the outside. The planar machining tool selection method according to appendix 4, wherein:

(Appendix 6)
When acquiring data of a three-dimensional shape model to be processed and automatically designing a processing step for the three-dimensional shape model, the finished shape of the processing is a processing step for a plane portion having a shape having at least one wall around it. To the computer that automatically selects the machining tool to use,
Replacement means for replacing the plane portion to be processed with a unit square composed of squares of the same area,
A function of a tool selection means for selecting a tool having a minimum unremoved ratio when cutting the plane portion replaced with the unit square; and
When determining the uncut portion ratio by the tool selection means, the unit square area is compared with the projected area in the tool axis direction of the candidate tool, and the value of the cuttable area ratio is greater than or equal to the specified value specified from the outside. A program for realizing a function of selecting a machining tool having such a radius, or a computer-readable recording medium on which the program is recorded.

(Appendix 7)
In Appendix 6,
An area comparison function for comparing the unit square area and a plurality of candidate tool projected areas, assuming a plurality of candidate tool circles, in contact with the unit square, by the tool selection means;
By comparing the above-mentioned areas, a function that reduces the cutting load of the machining tool and the uncut residue of the machining tool is realized by selecting a machining tool with a radius that makes the cutable area ratio equal to or greater than the predetermined value given from the outside. Or a computer-readable recording medium on which the program is recorded.

(Appendix 8)
In Appendix 6 or 7,
A function for selecting a tool by narrowing down a tool in a tool library in advance by an interference check with a machining shape by the tool selection means;
When there is no candidate tool that satisfies the conditions in the tool library, a program for realizing a display function for displaying on a screen a holder or protruding length that does not interfere with a tool diameter capable of machining the plane portion, or the program A computer-readable recording medium on which is recorded.

It is a principle explanatory view of the present invention. It is an apparatus block diagram in embodiment. It is processing explanatory drawing (1) in embodiment. It is processing explanatory drawing (2) in embodiment. It is processing explanatory drawing (the 3) in embodiment. It is a process flowchart (the 1) of the apparatus in embodiment. It is a process flowchart (the 2) of the apparatus in embodiment. It is a process flowchart (the 3) of the apparatus in embodiment. It is explanatory drawing of the prior art example 2. FIG. It is explanatory drawing of the prior art example 3. FIG. It is explanatory drawing of the prior art example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Computer main body 1A Plane processing tool selection apparatus main body 2 Display apparatus (display apparatus)
3 Input devices (keyboard / mouse, etc.)
4 Removable disk drive (RDD)
5 Hard disk drive (HDD)
6 CPU (Central Processing Unit)
7 ROM (Read Only Memory)
8 memory (work memory)
9 Interface control unit (I / F control unit)
10 Communication control unit

Claims (5)

When acquiring data of a three-dimensional shape model to be processed and automatically designing a processing step for the three-dimensional shape model, the finished shape of the processing is a processing step for a plane portion having a shape having at least one wall around it. A plane machining tool selection device that automatically selects a machining tool to be used,
Replacement means for replacing the plane portion to be processed with a plurality of unit squares of the same area;
Tool selection means for selecting a machining tool that minimizes the unremoved ratio when cutting the plane portion replaced with the unit square,
The tool selection means compares the unit square area and the projected area in the tool axis direction of the candidate tool when determining the uncut portion ratio, and the value of the cuttable area ratio is greater than or equal to a specified value specified from the outside. A plane machining tool selection device having a function of selecting a machining tool having a radius as described above. The tool selection means includes
An area comparison function that compares the unit square area with a plurality of candidate tool projection areas, assuming a plurality of candidate tool circles in contact with the unit square;
In the comparison of the areas, it has a processing tool selection function for selecting a processing tool having a radius such that the cuttable area ratio is equal to or greater than a predetermined value given from the outside,
2. The planar machining tool selection device according to claim 1, further comprising a function of reducing a cutting load of the machining tool and an uncut portion of the machining tool. The tool selection means includes
A function to select a machining tool by narrowing down the tools in the tool library in advance by checking interference with the machining shape,
When there is no candidate tool that satisfies the condition in the tool library, a display function for displaying on the screen the holder diameter or the projection length that does not interfere with the tool diameter that can machine the plane part,
The planar machining tool selection device according to claim 1, wherein the planar machining tool selection device is provided. When acquiring data of a three-dimensional shape model to be processed and automatically designing a processing step for the three-dimensional shape model, the finished shape of the processing is a processing step for a plane portion having a shape having at least one wall around it. A plane machining tool selection method for automatically selecting a machining tool to be used,
Replacement procedure for replacing the plane part to be processed with a plurality of unit squares having the same area;
A tool selection procedure for selecting a processing tool that minimizes the unremoved ratio when cutting the plane portion replaced with the unit square,
The tool selection procedure compares the unit square area and the projected area in the tool axis direction of the candidate tool when determining the uncut remaining ratio, and the value of the cuttable area ratio is greater than or equal to the specified value specified from the outside. A plane machining tool selection method comprising: selecting a machining tool having a radius such that An area comparison procedure for contacting the unit square and assuming a plurality of candidate tool circles and comparing the unit square area and the plurality of candidate tool projected areas;
In the comparison of the areas, by a processing tool selection procedure for selecting a processing tool having a radius such that the cuttable area ratio is equal to or greater than a predetermined value given from the outside,
5. The planar machining tool selection method according to claim 4, wherein a cutting load of the machining tool and an uncut portion of the machining tool are reduced.

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