JP4225422B2 - NC machining system, NC data creation device, NC data creation system, NC data creation method, and NC data creation program - Google Patents

Description

  The present invention relates to an NC machining system, an NC data creation device, an NC data creation system, an NC data creation method, and an NC data creation program, and in particular, an NC machining system that performs additional machining using a machined workpiece, The present invention relates to an NC data creation device, an NC data creation system, an NC data creation method, and an NC data creation program for creating NC data used for the additional machining.

  Conventionally, a method of creating a three-dimensional shape using three-dimensional CAD data includes a method of creating a three-dimensional shape by cutting a workpiece such as wax or clay. When the entire design shape is represented by a prescribed shape such as wax, it is necessary to set a desired positional relationship with respect to the entire design shape.

  On the other hand, when a part of the design shape is represented by a prescribed shape such as wax, it is necessary to set a desired portion for the entire design shape and to set a positional relationship of the prescribed shape for the desired portion.

  Conventionally, a designer who wants to form a desired three-dimensional shape from CAD data needs to determine the processing shape and the arrangement of the wax in consideration of the performance such as the cutting direction of the NC processing apparatus that processes the wax. For this reason, the processing shape is determined depending on the experience and skill of the designer.

  Japanese Patent Laid-Open No. 2002-116807 discloses a method for automatically creating NC data for controlling an NC machining apparatus. In the disclosed example, the shape of an object to be processed is acquired from CAD data, and NC data used for processing is created. However, there is no disclosure of a method for reworking a processed wax or clay when the fineness of the processed shape is changed after processing. For workpieces that have already been processed by further processing fine or fine processed products.

When performing minute changes to the wax or clay after processing, it is necessary to prepare and process new wax or clay again in the conventional technique.
JP 2002-116807 A

  An object of the present invention is to provide an NC machining system, an NC data creation device, an NC data creation system, an NC data creation method, and an NC data creation program that can easily create NC data using CAD data.

  Another object is to efficiently use a workpiece to be used for NC machining, thereby reducing costs and time in NC machining.

  [Means for Solving the Problems] will be described below using the numbers and symbols used in [Best Mode for Carrying Out the Invention] in parentheses. This number / symbol is added to clarify the correspondence between the description of [Claims] and the description of the best mode for carrying out the invention. It should not be used for interpreting the technical scope of the invention described in [Scope].

  The NC data creation device according to the present invention is a device for creating NC data (107) used for further processing a processed WAX, which is a processed workpiece, by controlling the NC processing device (30). The machining shape database (26A) that holds machining shape data (104) that is the surface data (102) of the machined WAX and the NC machining device (30) have been machined downward in the Z-axis direction, which is the main axis direction of the cutting tool. Processing history including an input device (22) for inputting an input correction value h that is a digging width, and a history correction value H that is a correction value at the time of additional machining in the past, for additional machining for digging the surface of the WAX evenly. Position coordinates obtained by moving the position data downward in the Z direction by the history correction value H from the database (26C) and the machining shape data (104), and machining shape data The machining range is determined from the position coordinates of the additional machining shape data (111) obtained by moving the position data downward in the Z direction by the correction value H + h from (104), and the additional machining shape data (111) is sent to the NC machining device (30). And an NC data creation module (230) for creating NC data (107) for processing the processed WAX into a shape corresponding to the above.

  The machining shape data (104) is surface data (111) having a similar shape corresponding to the size of the machined WAX when no additional machining is performed (H = 0), and is in the NC machining device (30). The coordinates of each point on the surface of the processed WAX arranged at the position correspond to the coordinates of each point in the processed shape data (104).

  The NC processing device (30) further includes a tool data database (27) that holds tool data (105), which is information on a processing tool used for processing, and the NC data creation module (230) is used based on the processing range. A processing condition adding unit (233) for determining a tool and extracting tool data (105) corresponding to the tool used from the tool data database (27), and a tool used and a processed WAX from the processing range and tool data (105) The NC processing device (30) can use the tool path creation unit (234) that calculates the tool path data (106) that is the movement path of the tool used and the tool path data (106). A post processor that converts the data into a code and creates NC data (107).

  The history database (26C) stores the correction value H + h as the history correction value H in association with the machining shape data (104).

  The NC machining device (30) connected to the NC data creation device (20) can additionally process the machined WAX using the created NC data (107).

  As described above, by reworking the processed recycle WAX, it is possible to effectively utilize the WAX resources, easily cope with fine design changes, and obtain a changed shape.

  According to the NC machining system, NC data creation device, NC data creation system, NC data creation method, and NC data creation program according to the present invention, NC data can be easily created using CAD data.

  Another object of the present invention is to efficiently use the workpiece used for NC machining and reduce the cost and time in NC machining.

  Embodiments of an NC data creation system according to the present invention will be described below with reference to the accompanying drawings.

  In this embodiment, when developing a mock-up by processing wax or clay that is a workpiece in the development of a new product, etc., the processed wax or clay is used to cope with minute design changes. An NC machining system for creating a mockup of a new shape will be described. In the present embodiment, an NC machining system that creates NC data 107 used by the NC machining apparatus from CAD data created by the CAD apparatus 10 and re-processes (adds) the machined processed WAX will be described as an example. To do.

  FIG. 1 shows the configuration of an NC machining system according to the present invention in the present embodiment.

  The NC data creation system according to the present invention includes a CAD device 10 that can create, display, and process CAD data, a CAM device 20 that creates NC data 107 based on CAD data transmitted from the CAD device 10, and NC data 107. And NC processing device 30 for cutting wax and clay (hereinafter referred to as WAX) using various tools.

  The CAD device 10, the CAM device 20, and the NC processing device 30 are connected to each other via a network 40 (or simply a communication line), and are installed at a remote location or in the vicinity of each other. Also, there may be a plurality of each device. In this way, by connecting a plurality of CAD devices 10, CAM devices 20, and NC processing devices 30 via a network such as a LAN, various NC data 107 are created using CAD data designed by the remote CAD device 10. The NC processing device 30 can process the WAX using the NC data 107 created by the remote CAM device 20.

  Referring to FIG. 1, a CAM device 10 according to the present invention is a three-dimensional CAD device including a CAD data creation unit 11, a CAD data database 12, and an I / O interface 13. The devices are connected to each other via a communication bus, and the I / O interface 13 is connected to the CAM device 20 and the NC processing device 30 via a network.

  The CAD data creation unit 11 creates surface data 102, which is product three-dimensional CAD data, using data obtained by laser scanning or the like from product shape design or product mockup. The created surface data 102 is accumulated in the CAD data database 12 or sent to the CAM device 20 via the I / O interface 13 and used for creating the NC data 107.

  The CAD data database 12 may be a memory, a hard disk, or a portable recording medium, and may be installed inside or outside the CAD device 10. The surface data in the CAD data database 12 is extracted by a request from the CAM device 20 and transmitted to the CAM device 20 via the I / O interface 13.

  FIG. 2 is a block diagram of the CAM device 20 according to the present invention. The CAM device 20 includes a display device 21, an input device 22, a CPU 23, a memory 24, a CAD data buffer 25, an extraction area database 26, a tool data database 27, a machining shape database 28A, an NC data database 28B, a machining history database 28C, an I / An O interface 29 is provided. Each device is connected by a communication bus. Further, it includes an NC data creation module 230 that is a program executed by the CPU 23 or a combination of a program and an apparatus.

  The display device 21 includes surface data 102, which is three-dimensional CAD data acquired from the CAD device 10, wire frame data indicating the shape of an unprocessed WAX, and processed shape data 104 indicating the shape of a selected or created WAX after processing. Is a monitor that displays. The input device 22 including a keyboard and a mouse is operated by a user, and various conditions such as a tool and a processing form when processing the WAX, and a correction amount when performing additional machining are input. The input conditions are sent to the CPU 23, and the NC data creation module 230 creates the NC data 107. In addition, the user can move the surface data 102 and the wire frame data displayed on the display device 21 by operating the mouse or the like.

  The CPU 23 creates the NC data 107 by executing the process of the NC data creation module 230 using the conditions input from the input device 22, various signals, and data. When the NC data 107 is created, various necessary signals and data are temporarily stored in the memory 24.

  The NC data creation module 230 is a program or a combination of a program and an apparatus, and includes a machining shape creation unit 23A and an NC data creation unit 23B. The machining shape creation unit 23A extracts machining shape data 104, which is data of a shape to be machined, from the surface data 102 transmitted from the CAM device 10. The NC data creation unit 23B creates NC data 107 used by the NC machining apparatus 30 to machine the WAX from the machining shape data 104 created by the machining shape creation unit 23A and the machining conditions input by the user.

  The CAD data buffer 25 holds the surface data 102 received from the CAD device 10. The surface data 102 in the CAD data buffer is extracted under the control of the CPU 23 when the machining shape data 104 and the NC data 107 are created.

  The WAX shape database 26 holds WAX shape data 101 corresponding to an unprocessed WAX shape. Here, the shape of the unprocessed WAX is determined by a plurality of types of prescribed shapes.

The prescribed shape of the unprocessed WAX in the present embodiment is a rectangular parallelepiped. This shape may be any shape as long as it corresponds to the WAX shape data 101. FIG. 3 is a correspondence diagram of the WAX shape data 101 (FIG. 3A) displayed on the display device 21 and the unprocessed WAX (FIG. 3B) installed in the NC processing device 30. The WAX shape data 101 is displayed as frame data having a rectangular parallelepiped shape, and is handled as local AXIS data on the local axis with the center O of the bottom surface (xy plane) as the origin. A point A (a ₁ , b ₁ , c ₁ ) and a point B (a ₂ , b ₂ , c ₂ ), which are two corners on the xy plane of the WAX shape data 101, are the WAX installation base of the NC processing device 30. Corresponding to point A ′ (a ₁ ′, b ₁ ′, c ₁ ′) and point B ′ (a ₂ ′, b ₂ ′, c ₂ ′), which are two points of the WAX fixing jig 32 on 31, By fixing the selected WAX to the two points, the coordinates of each point in the frame of the WAX shape data 101 are associated with the position coordinates inside the WAX used for processing. In addition, as long as the coordinate of the WAX shape data 101 and the coordinate on the WAX installation base 31 are matched, you may respond | correspond to any point of a fixed jig. However, in this case, the WAX fixing jig 32 has a shape corresponding to the size of the WAX, and preferably has a shape that determines the size of the WAX simply by being installed. For example, three standard sizes of WAX, L, M, and S, are prepared, and the user can select automatically or according to the shape to be processed.

  In this way, the user can easily perform positioning without processing by simply fixing the WAX to be processed to the WAX fixing jig 32 without having specialized knowledge.

  The tool data database 27 holds tool data that is information such as the type, shape, and characteristics of the machining tool used in the NC machining apparatus 30.

  The machining shape database 28A records the machining shape data 104 created by the machining shape creation unit 23A. The NC data database 28B records the NC data 107 created by the NC data creation unit 23B. At this time, the machining shape data 104 and the NC data 107 related to machining of the same design shape are associated and recorded in the respective databases.

  The machining history database 28C records machining history data 109, which is a correction value at the time of additional machining, in association with the machining shape data 104. The correction value indicates the amount dug down in the Z-axis direction when the processed WAX is additionally processed. For example, the correction value is indicated as a history correction value H.

  The WAX shape database 26, the tool data database 27, the machining shape database 28A, the NC data database 28B, and the machining history database 28C are storage devices including a memory or a disk, and may be a portable storage medium such as a CD or MO. By using such a recording medium, it is possible to process the WAX using each data even with an NC processing apparatus not connected to the network 40.

(Creation of machining shape data 104 and NC data 107)
The configuration and operation of the machining shape creation unit 23A and the NC data creation unit 23B in the NC data creation module 230 when machining an unprocessed WAX having a prescribed shape will be described.

  The machining shape creating unit 23A uses the surface data 102 stored in the CAD data buffer 25 and the WAX shape data 101 held in the WAX shape database 26 to obtain a machining shape which is the surface data 102 of the shape to be machined. Data 104 is created.

  The processing area extraction unit 231 extracts the surface data 102 from the CAD data buffer 25 storing the surface data 102 transmitted from the CAD device 10 and displays the surface data 102 on the display screen. Further, the WAX shape data 101 selected by the user is read from the WAX shape database 26 based on the WAX shape selected by the input device 22 and displayed on the display device 21 as frame data. When the frame data and the surface data 102 are superimposed on the display by the user's operation of the input device 22, the processing area extraction unit 231 extracts the surface data 102 surrounded by the frame data. At this time, if the processing mode is the whole processing, all the surface data 102 surrounded by the frame data is extracted, and if the processing mode is the partial processing, the surface data 102 surrounded by the frame data is extracted, and other data is trimmed. Is done.

  The surface data 102 that is three-dimensional CAD data is global AXIS data on a global axis with a certain point as the origin. The processing area extraction unit 231 converts the coordinates of each point of the extracted surface data 102 into local coordinates of the frame data, and associates them with the position coordinates in the WAX after processing on the NC processing device 30. In this manner, the machining area extraction unit 231 extracts the surface data 102 from the unprocessed WAX data (WAX shape data 101), and converts the coordinate-converted surface data into the machining constraint processing unit 232 as the machining area data 103. send.

FIG. 4 is a conceptual diagram when extracting the processing area data 103 from the surface data 102. The WAX shape data 101 displayed on the display device 21 by the operation of the input device 22 by the user is superimposed on the surface data 102 in an arbitrary direction and an arbitrary angle (inclination can be set three-dimensionally in six axes). The processing area extraction unit 231 rotates, moves, and expands the coordinates of each point of the surface data 102 surrounded by the WAX data, converts them into local coordinates, and extracts them. A partial selection in which a part of the surface data 102 is surrounded by the WAX shape data 101 and the surrounded surface data 102 is extracted will be described with reference to FIG. The surface data 102 is a global coordinate system (P _o , u, v, n), a coordinate origin P _o (u _o , v _o , n _o ), an orthogonal basic unit vector (u, v, n), and has a WAX shape. The data 101 is a local coordinate system (O, i, j, k), a coordinate origin O (x _o , _yo , _zo ), and an orthogonal basic vector (i, j, k). The coordinates (position vector) of the surface data 102 before coordinate conversion are P (x ′, y ′, z ′, 1), and the coordinates (position vector) of the surface data 102 after conversion are R (x, y, z, 1). Then, the point P of the surface data 102 surrounded by the WAX data is coordinate-transformed by the following equation.

  FIG. 4B shows a conceptual diagram when the entire surface data 102 is extracted. In the overall selection, the WAX shape data 101 is automatically arranged so as to surround the entire surface data 102, and the coordinates of all the surface data 102 are converted into local coordinates. The conversion is the same as above. The coordinate conversion for extracting the surface data 102 is not limited to the above as long as it can be converted into the coordinate system of the WAX shape data 101.

  Since the cutting tool of the NC processing apparatus 30 according to the present embodiment is a tool for triaxial processing, a concave portion that is recessed in the xy direction of the tool moving direction becomes a non-cuttable region. When the machining area extracted by the machining area extraction unit 231 has such a non-cuttable area, the machining restriction processing unit 232 moves the cuttable surface at the upper part in the Z direction of the non-cuttable area below the z-direction. Create an extended support surface. The machining constraint processing unit 232 creates the machining shape data 104 by adding a support surface to the non-cuttable area of the machining area. If the support surface can be created by extending the cuttable surface, the cuttable surface in the X or Y direction of the uncuttable region may be extended.

  The NC data creation unit 23B includes a machining condition addition unit 233, a tool path creation unit 234, and a post processor 235. Based on the machining shape data 104 created by the machining shape creation unit 23A, the NC machining device 30 processes the WAX. NC data 107 is created.

  The machining condition adding unit 233 refers to the machining shape data 104 and the WAX shape data 101 to calculate a WAX cutting range and a cutting amount, and determines a tool to be used for machining. When the cutting range in the WAX Z-axis direction (the main axis direction of the tool) is large, that is, at the beginning of machining, the machining condition adding unit 233 uses a cutting tool with a large diameter to reduce the machining time. In order to perform machining precisely in the vicinity of the machining surface, a machining process design that performs finishing machining using a tool having a small diameter is performed, and a tool to be used is determined.

  Tool data 105 such as the ball diameter (cutting accuracy) and cutting ability (cutting amount, cutting speed) of the cutting tool used for processing is accumulated in the tool data database 27, and the processing condition adding unit 233 performs cutting from here. Tool data 105 corresponding to the range and the cutting amount is extracted, and the processing method for roughing and finishing is determined. Note that the user may select a tool or processing method. At this time, the user confirms the display device 21 and selects the desired tool and processing method using the input device 22, thereby extracting the tool data from the tool data database 27 and sending it to the processing condition adding unit 233. Determine the tool and processing method to be used.

  The tool path creation unit 234 uses the cutting range vector determined by the machining condition adding unit 233, the coordinates (for example, origin coordinates) and the shape (for example, height information) of the WAX shape data 101, and the WAX and tool obtained from the tool data 105. Based on the positional relationship with the tip, etc., tool path data 106 that is a movement path (coordinates on the NC processing device 30) followed by the tool (tool tip) during machining is created.

  The post processor 235 creates the NC data 107 by converting the tool path data 106 into a format corresponding to the NC processing device 30. Further, the tool data 105 for each tool used, the optimum moving speed, and the optimum spindle rotation speed are calculated and added to the NC data 107 together with the WAX shape data 101 to be used to create the NC data file 108. At this time, the post processor 235 can further calculate the machining time based on the tool path, the optimum moving speed of the tool, and the optimum spindle rotation speed, and can display the machining time on the display device 21 at the request of the user.

  The post processor 235 associates and records all the NC data files 108 used for the processing in the NC data database 28B.

  When the NC data file 108 is created, the machining shape data 104 is recorded in the machining shape database 28A in association with the NC data 107.

  The NC data file 108 is transmitted from the I / O interface 29 to the NC processing device 30 via the network 40, and the NC processing device 30 performs WAX processing using the NC data file 108. Further, since the CAD device is connected from the I / O interface 29 to the other CAM device 20, the CAD device 10, and the NC processing device 30 via the network 40, the user can create an NC data file created by another user. It is also possible to process the WAX by processing the WAX using the 108, or by creating the NC data file 108 using the surface data 102 designed by the distant designer using the CAD device 20.

(Additional machining)
With reference to FIG. 7, in the NC machining system according to the present invention, an additional machining operation using the machined WAX will be described. The additional machining is a machining method in which the machined WAX created using the NC file 108 created as described above is further machined, and the machining surface is dug uniformly by hmm in the Z direction cut by the machining tool. .

  When performing additional machining, an input correction value h is input from the input device 22 by a user operation, and a processed WAX is selected. Here, the NC data creation module 230 operates in the additional machining mode. The NC data creation unit 23B in the additional machining mode refers to the difference between the position coordinates of the machining shape data corresponding to the selected machined WAX and the correction value, and selects the tool data 105 and the tool path data as described above. 106, NC data 107 and NC file 108 are created.

  Here, the correspondence between the processing shape data 104 and the position coordinates of the processed WAX on the WAX installation base 31 will be described.

  FIG. 5 is a correspondence diagram between the machining shape data 104 (FIG. 5A) and the processed WAX (FIG. 5B) installed in the NC machining apparatus 30. When the WAX having the prescribed shape is machined, a bottom surface portion (an unworkable region having a height of 1) that cannot be cut by the WAX fixing jig 32 remains. For this reason, the shape of the bottom portion of the processed WAX matches the shape of the bottom portion of the unprocessed WAX shape. In other words, the coordinate origin O (x, y, z), the two points A (a1, b1, c1) and the point BA (a2, b2, c2) in the bottom surface of the unprocessed regular shape WAX The coordinate origin O (x, y, z) in the bottom surface coincides with the two points A (a1, b1, c1) and the point BA (a2, b2, c2) (see FIGS. 3A and 5A). ).

Accordingly, similarly to the WAX shape data 101, a point A (a ₁ , b ₁ , c ₁ ) and a point B (a ₂ , b ₂ , c ₂ ) which are two points on the xy plane of the processed shape data 104 are displayed. Are a point A ′ (a ₁ ′, b ₁ ′, c ₁ ′) and a point B ′ (a ₂ ′, b ₂ ) which are two points of the WAX fixing jig 32 on the WAX installation base 31 of the NC processing device 30. ', C ₂ '), and the processed WAX is fixed to the two points, the coordinates of each point in the processed shape data 104 are associated with the position coordinates inside the processed WAX used for processing. .

(Flow of additional machining operations)
The user uses the input device 22 to select additional machining as the machining mode, and selects the processed WAX as the WAX used for machining (step S2). The NC data creation module 230 operates in the additional machining mode according to the command for performing the additional machining. The additional machining may be performed subsequently to the normal machining, or may be started from the new machining after the normal machining is finished. The machining area extraction unit 23A extracts machining shape data 104 corresponding to the machined WAX selected from the machining shape database 26A, and sends the machining shape data 104 to the NC creation unit 23B.

  Next, the user uses the input device 22 to input a desired input correction value h (step S4). When the processed WAX has already been additionally processed, the user may input the history correction value H, which is the processing width from the first processing surface when processing the WAX having the specified shape, together with the input correction value h. .

The machining condition load unit 233 extracts the history correction value H related to the machining shape data 104 sent from the machining area extraction unit 23A from the machining history database 26C (or uses the history correction value H input by the user). ) And the input correction amount h input from the input device 22 is summed to calculate a correction value H + h. Next, the coordinates of the surface obtained by lowering the position coordinates of the machining shape data 104 in the Z direction by the history correction value H (corresponding to the shape of the processed WAX on the NC machining device 30), and the surface coordinates obtained by reducing the correction value H + h. Coordinates (additional machining shape data 111 which is a WAX shape obtained by the additional machining) are calculated (step S6).

  FIG. 6 shows an example of the history correction value H and the input correction value h. The first processed surface is the A plane, the second processed surface processed by digging 2 mm of the processed A plane is the B plane, and the third processed surface processed by further digging the B plane by 2 mm is the C plane. In the first processing, the history correction value H = 0 and the input correction value h = 0. In the second machining, the history correction value H = 0 and the input correction value H = 2 mm, and the created additional machining shape data 111 is surface data obtained by lowering the machining shape data 104 by the correction value 2 mm. In the third machining, the history correction value is H = 2 mm, the input correction value is h = 2 mm, and the created additional machining shape data 111 is surface data obtained by lowering the machining value data 104 by the correction value 4 mm.

  The machining condition adding unit 233 refers to the surface with the history correction value H lowered and the position coordinates of the additional machining shape data 111, calculates the cutting range and the cutting amount of the WAX, and determines a tool to be used for machining (step S8). . In additional machining, since the cutting amount of WAX is small from the beginning of machining, a tool with a small diameter is selected and set to perform finishing from the beginning. Note that the user may check the selected tool and processing method on the display device 21 and change the rough tool processing or the like using a processing tool having a large tool diameter.

  The tool path creation unit 234 uses the cutting range vector determined by the machining condition adding unit 233, the coordinates (for example, origin coordinates) and the shape (for example, height information) of the WAX shape data 101, and the WAX and tool obtained from the tool data 105. Based on the positional relationship with the tip, etc., tool path data 106 that is a movement path (coordinates on the NC processing device 30) followed by the tool (tool tip) during machining is created.

  The post processor 235 creates the NC data 107 by converting the tool path data 106 into a format corresponding to the NC processing device 30 (step S10). Further, the tool data 105 for each tool used, the optimum moving speed, and the optimum spindle rotation speed are calculated and added to the NC data 107 together with the WAX shape data 101 to be used to create the NC data file 108.

  The NC processing apparatus 30 acquires the NC data file 108 via the network 40, and uses this to perform additional processing of the used WAX (step S12).

  The correction value h used in the additional machining is recorded in the machining history database 26C as the history correction value H in association with (linked to) the used machining shape data 104 (step S14).

  As described above, the user can rework the processed WAX and perform additional machining. In this way, by using the processed WAX again, it is possible to eliminate the waste of the WAX and reduce the cost. Further, compared with the case of processing WAX from the beginning, the time for roughing can be omitted, so that it can be processed into a desired shape in a very short time. For this reason, significant cost reduction is expected.

  Furthermore, by saving the machining shape data 104 created when machining a new WAX and recording correction values as history, the amount of saved data can be reduced, and the accompanying configuration and memory capacity can be saved. . The history correction value may be input from the input device 22. At this time, it is not necessary to configure the history database 26C, and the configuration can be further reduced.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and modifications within a scope not departing from the gist of the present invention are included in the present invention. .

FIG. 1 is a configuration diagram of an NC data creation system according to the present invention. FIG. 2 is a block diagram of a CAM device according to the present invention. FIG. 3 is a correspondence diagram between the WAX shape data displayed on the display device 21 and the unprocessed WAX installed in the NC processing device. FIG. 4 is a conceptual diagram when processing region data is extracted from surface data according to the present invention. FIG. 5 is a correspondence diagram of the machining shape data and the machined WAX installed in the NC machining apparatus 30. FIG. 6 is an example of the correction value H and the input correction value h. FIG. 7 is a flow of an additional machining operation using the used WAX of the NC machining system according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: CAD apparatus 20: CAM apparatus 30: NC processing apparatus 40: Network 11: CAD data creation part 12: CAD data database 13: I / O interface 21: Display apparatus 22: Input apparatus 23: CPU
24: Memory 230: NC data creation module 23A: Machining shape creation unit 23B: NC data creation unit 231: Machining area extraction unit 232: Machining constraint processing unit 233: Machining condition addition unit 234: Tool path creation unit 235: Post processor 25 : CAD data buffer 26A: Machining shape database 26B: NC data database 26C: Machining history database 27: Tool database 28: NC data database 29: I / O interface 31: WAX installation stand 32: WAX fixed jig 101: WAX shape data 102 : Surface data 103: Machining area data 104: Machining shape data 105: Tool data 106: Tool path data 107: NC data 108: NC data file 109: Machining history data 111: additional machining shape data

Claims (8)

An apparatus for creating NC data used to further process a processed WAX that is a processed workpiece by controlling the NC processing apparatus,
A machining shape database that holds machining shape data that is the surface data of the machined WAX;
An input device for inputting an input correction value h, which is a digging width, for additional machining for digging the surface of the machined WAX uniformly downward in the Z-axis direction which is the main axis direction of the cutting tool in the NC machining device;
A machining history database comprising a history correction value H, which is a correction value at the time of additional machining in the past,
From the machining shape data, the position coordinates of the position data moved downward in the Z direction by the history correction value H, and the position coordinates of the additional machining shape data moved from the machining shape data by the correction value H + h downward in the Z direction. An NC data creation device comprising: an NC data creation module for determining a machining range and creating NC data for causing the NC machining device to machine the workpiece into a shape corresponding to the additional machining shape data. In the NC data creation device according to claim 1,
The machined shape data is surface data of a similar shape corresponding to the size of the machined WAX when no additional machining is performed (H = 0), and the machined data placed in the NC machining apparatus The coordinates of each point on the surface of the initial value of WAX correspond to the coordinates of each point of the machining shape data. In the NC data creation device according to claim 1 or 2,
A tool data database for holding tool data which is information of a processing tool used for processing by the NC processing apparatus;
The NC data creation module
A processing condition adding unit that determines a tool to be used based on the processing range and extracts tool data corresponding to the tool to be used from the tool data database;
A tool path creation unit that calculates a positional relationship between the tool used and the machined WAX from the machining range and the tool data, and calculates tool path data that is a movement path of the tool used;
An NC data creation device comprising: a post processor for creating NC data by converting the tool path data into a code usable by the NC machining device. In the NC data creation device according to any one of claims 1 to 3,
The history database is an NC data creation device that stores the correction value H + h in association with the machining shape data as the history correction value H. With the additional processing method that controls the NC processing device and processes the processed WAX, which is the processed workpiece, downward in the Z-axis direction, which is the main axis direction of the cutting tool, and evenly digs the surface of the processed WAX by the correction value h There,
Extracting machining shape data that is surface data of a processed WAX that has not been subjected to the additional machining;
Calculating the shape of the current processed WAX from the processed shape data and the history correction value H, which is a correction value when the additional processing was performed in the past;
Determining a machining range from the shape of the current machined WAX and the correction value h;
Creating NC data for machining the machined WAX into a shape corresponding to the additional machining shape based on the machining range. The NC data creation method according to claim 5,
Inputting an input correction value h when creating the NC data;
And storing the correction value H + h as a history correction value H. NC data generation method. An NC data creation program for causing a computer to execute the NC data creation method according to claim 5. Connected to each other via a network,
NC data creation device according to any one of claims 1 to 6,
An NC processing system comprising: an NC processing device that processes the processed WAX using the NC data.

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