JP5806169B2 - Design data generation apparatus, generation method thereof, and program - Google Patents

Description

  The present invention relates to a design data generation apparatus that generates partial correction data by partially correcting predetermined plane data, a generation method thereof, and a program.

  In general, it is necessary to create a partial correction surface in CAD (Computer Aided Design) data by design change or correction. At that time, in the design surface created in the previous process, the intention of the designer and the flow direction of the surface are regarded as important. For this reason, there is a region that must not be trimmed in a later process, and it is necessary to minimize the range of the correction surface. In some cases, such a connection between the pre-prepared surface and the correction surface cannot be handled only by a surface boundary connection that connects the respective edges, and a trim boundary connection that connects the respective sides in an arbitrary direction is required.

  On the other hand, there is known a design data generation apparatus that designs a new article shape by utilizing the deformation of the surface shape of an existing article (see, for example, Patent Document 1).

JP 2007-172180 A

  However, in the design data generation apparatus shown in Patent Document 1, the trim boundary connection is not performed, and the connection surface is locally deformed to perform the connection. It becomes difficult to secure.

  The present invention has been made to solve such problems, and mainly provides a design data generation apparatus, a generation method thereof, and a program capable of smoothly generating the entire surface while performing trim boundary connection. Objective.

One aspect of the present invention for achieving the above object is a design data generation apparatus that generates correction surface data by partially correcting predetermined surface data, the correction surface data and the correction surface data. A grid setting means for setting a plurality of grid points around the curve, a curve approximation means for approximating the row of grid points in a predetermined direction set by the grid setting means, and a curve approximated by the curve approximation means A curved surface generating unit that generates a curved surface based on the trimming unit, and a trim unit that trims the curved surface at a trim boundary line where the curved surface generated by the curved surface generating unit and the predetermined surface data intersect to generate the corrected surface data; A design data generation device comprising:
In this aspect, it further includes a determination unit that determines whether the grid point is outside or inside the correction surface data, and the curve approximation unit is configured to determine whether the grid approximation unit is included in the grid point column. The curve approximation may be performed on each of the determined outer grid points and the target point that is the target of the correction surface data.
In this aspect, the image processing apparatus may further include replacement means for replacing each lattice point with the closest point on the curve approximated by the curve approximation means.
In this aspect, the apparatus further includes a smoothing unit that smoothes the row of the lattice points replaced by the replacement unit, and the curved surface generation unit includes the lattice points smoothed by the smoothing unit. A curved surface may be generated based on the sequence.
In this aspect, the replacement means assigns weights to the respective grid points, and the smoothing means sequentially searches the sequence of the respective grid points and approximates them using a least square method. When performing smoothing and approximation using the least squares method, weighting may be performed using the weight for each grid point given by the replacement means.
In this one aspect, the replacement means has a first weight value with a small amount of movement of each grid point when the smoothing is performed on each grid point, and when the smoothing is performed. You may set the 2nd weight value with which the moving amount | distance of each said grid point is large, and the 3rd weight value set so that it may increase gradually from the said 1st weight value to the said 2nd weight value.
In this aspect, the smoothing means generates a group of a predetermined number of adjacent lattice points in the row of the respective lattice points, smoothes the generated lattice point group, and the group of lattice points. When the smoothing is completed, the grid point group is newly generated by shifting by a predetermined point next to the group, the generated grid point group is smoothed, and the group generation and smoothing may be repeated. .
In this aspect, the smoothing means may perform the smoothing a predetermined number of times for each group of the predetermined number of grid points.
In this one aspect, the smoothing means performs the smoothing a plurality of times for each group of the predetermined number of grid points, and sets the target points to be corrected surface data and the smoothed points. The smoothing may be terminated when the distance from the lattice point is within an allowable value.
In this aspect, the curve approximation means may perform the curve approximation using a least square method.
In this aspect, the image forming apparatus may further include a storage unit that stores at least one of the predetermined surface data and the corrected surface data.
In this aspect, the display device may further include display means for displaying at least one of the corrected surface data and the predetermined surface data.
On the other hand, an aspect of the present invention for achieving the above object is a design data generation apparatus for generating correction surface data by performing partial correction on predetermined surface data. And a step of setting a plurality of grid points around the correction surface data, a step of approximating a curve of the set of grid points in the predetermined direction, and generating a curved surface based on the approximated curve And a step of generating the corrected surface data by trimming the curved surface at a trim boundary line where the generated curved surface and the predetermined surface data intersect with each other. It may be a generation method.
Furthermore, one aspect of the present invention for achieving the above object is a program of a design data generation device that generates a corrected surface data by performing partial correction on predetermined surface data. A process of setting a plurality of grid points around the corrected surface data, a process of approximating the row of grid points in the predetermined direction set in a curve, and a process of generating a curved surface based on the approximated curve And generating the modified surface data by trimming the curved surface at a trim boundary line where the generated curved surface and the predetermined surface data intersect with each other. It may be a program of the apparatus.

  According to the present invention, it is possible to provide a design data generation apparatus, a generation method thereof, and a program that can generate an entire surface smoothly while performing trim boundary connection.

1 is a block diagram showing a schematic system configuration of a design data generation apparatus according to an embodiment of the present invention. It is a figure which shows an example which produces | generates the correction surface which performed partial correction with respect to the prior preparation surface. 1 is a block diagram showing a schematic system configuration of a CAD apparatus of a design data generation apparatus according to an embodiment of the present invention. It is a figure which shows an example of the state which produced | generated the lattice point group in the correction surface area | region and its circumference | surroundings. It is a figure which shows an example of the lattice point row | line | column which extracted and stored the lattice point from the lattice point group in the fixed direction. It is a figure which shows an example of the state which determined whether each lattice point of each lattice point row | line | column is inside or outside a correction surface area | region. (A) It is a figure which shows an example of the approximated curve which approximated the curve using the least squares method by making the point on a target point and a preliminarily created surface into a passing point. (B) It is sectional drawing when the lattice point sequence shown to Fig.7 (a) is cut | disconnected in the perpendicular direction by the straight line of the U direction. It is a figure which shows an example of the state which replaced each grid point of each grid point row | line | column with the coordinate value on an approximated curve. (A) It is a figure which shows an example of the lattice point group which performs smoothing. (B) It is a figure which shows an example of the lattice point group which performs smoothing. (C) It is a figure which shows an example of the lattice point group which performs smoothing. (D) It is a figure which shows an example of the lattice point group which performs smoothing. (E) It is a figure which shows an example of the lattice point group which performs smoothing. (F) It is a figure which shows an example of the lattice point group which performs smoothing. (G) It is a figure which shows an example of the lattice point group which performs smoothing. It is a figure which shows an example of the state which reflected the coordinate value after smoothing in each grid point sequence. It is a figure which shows an example of the parametric curved surface produced | generated with respect to each smoothed grid point sequence. It is a figure which shows an example of the state which trims a parametric curved surface with a trim boundary line. It is a flowchart which shows the flow of the production | generation method of the design model by the design model production | generation apparatus which concerns on one embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic system configuration of a design data generation apparatus according to an embodiment of the present invention. A design data generation device 1 according to the present embodiment includes a CAD (Computer Aided Design) device 2 that generates design data, a storage unit 3 that stores design data and the like, a display unit 4 that displays design data and the like, It has.

  The storage unit 3 is a specific example of a storage unit, and includes, for example, a magnetic disk device or an optical disk device. The storage unit 3 stores arbitrary design data such as a computer model, for example. The display unit 4 is a specific example of the display means, and is constituted by, for example, a liquid crystal display device, an organic or inorganic EL display device, or the like. The display unit 4 can display, for example, design data output from the CAD device 2 or the storage unit 3. The display unit 4 may have a function as a touch panel, and may be configured such that the user can input data described later.

  The CAD device 2 has a function of generating and processing a computer model. Note that the computer model includes, for example, an arbitrary design model such as a body of an automobile, an aircraft, a train or the like.

  The CAD device 2 includes, for example, a CPU (Central Processing Unit) 2a that performs arithmetic processing and the like, a ROM (Read Only Memory) 2b that stores arithmetic programs executed by the CPU 2a, and a RAM that temporarily stores processing data and the like (Random Access Memory) A hardware composed of a microcomputer composed of 2c and the like. The CPU 2a, ROM 2b, and RAM 2c are connected to each other via a data bus 2d.

  For example, the CAD device 2 generates a corrected surface area 51 obtained by performing partial correction on a surface (hereinafter referred to as a pre-created surface) 50 having a computer model (FIG. 2). At this time, the CAD device 2 according to the present embodiment performs trim boundary connection that connects the preceding creation surface 50 and the correction surface region 51 in an arbitrary direction (for example, a direction different from the U direction and the V direction described later). In addition, the smoothness of the entire surface can be ensured.

  FIG. 3 is a block diagram showing a schematic system configuration of the CAD apparatus of the design model generation apparatus according to the present embodiment. The CAD apparatus 2 includes, for example, a lattice setting unit 21, an inside / outside determination unit 22, a curve approximation unit 23, a replacement unit 24, a smoothing unit 25, a curved surface generation unit 26, and a trim unit 27. ing.

  The lattice setting unit 21 is a specific example of a lattice setting unit. For example, a preceding creation surface (one specific example of predetermined surface data) 50, which is a computer model, and a modification for correcting the preceding creation surface 50 A surface area (one specific example of corrected surface data) 51 is read from the storage unit 3. Then, the lattice setting unit 21 sets a plurality of lattice points 52 at substantially equal intervals in the U direction and the V direction around the correction surface region (shaded portion) 51 (FIG. 4). Here, the U direction and the V direction indicate, for example, parameter directions of the preceding creation surface 50. Moreover, the correction surface area | region 51 is preset with respect to the prior preparation surface 50, for example by the user. The correction surface area 51 is configured to be arbitrarily set and changed via an input device such as a keyboard, a mouse, a touch panel, and a switch.

  In FIG. 4, for example, grid points 52 having 6 components in the V direction and 9 components (6 × 9) in the U direction are set, but the grid points 52 are not limited to this and are set to include the correction surface region 51. Any setting method can be applied. In consideration of generating the entire surface more smoothly and the amount of calculation, it is preferable to set one or two points on the correction surface region 51 and the outside thereof as shown in FIG.

  Here, an array in which the lattice points 52 are extracted and stored in a predetermined direction (for example, the U direction and the V direction) from the set lattice points 52 is defined as a lattice point sequence 53. For example, there are P (00) to P (80) as an example of the grid point sequence 53 in the U direction, and P (40) to P (45) as an example of the grid point sequence 53 in the V direction (FIG. 5).

  The inside / outside determination unit 22 is a specific example of a determination unit, and determines whether each grid point 52 of each grid point sequence 53 set by the grid setting unit 21 is inside or outside the correction surface region 51. Then, each lattice point sequence 53 in the correction surface area 51 or outside the correction surface area 51 is extracted (FIG. 6).

  In addition, when the lattice point 52 is on the boundary line of the correction surface region 51, it is assumed that the lattice point 52 is on the side where many lattice points 52 are included. 52 may be all inside or outside, and any definition method can be applied. Furthermore, in the present embodiment, when the lattice points 52 are outside the boundary line of the correction surface region 51, it is more preferable to determine that all are outside. Thereby, the whole surface can be generated more smoothly.

  The curve approximation unit 23 is a specific example of a curve approximation unit. For each grid point sequence 53, a target point and a point on the preceding creation surface 50 are set as a passing point (reference point), and these passing points are subjected to a least square method. An approximate curve 54 that is approximated by using the curve is generated (FIG. 7A). Here, the target point indicates a desired position that the user wants to create as the correction surface area 51, for example, a coordinate value near the target of the correction surface area 51. Further, the point on the preceding creation surface 50 indicates, for example, a lattice point 52 outside the correction surface region 51 in each lattice point sequence 53.

  Note that the setting of the passing point can be arbitrarily changed by the user. For example, in FIG. 7A, the preceding creation surface 50 and the correction surface region 51 are connected by a dotted line (1) and disconnected by a dotted line (2). In this case, the grid points 7, 8, and 9 are points on the preceding creation surface 50, and the grid points 1 to 6 are target points. On the other hand, the preceding creation surface 50 and the correction surface region 51 may be connected by a dotted line (1) and a dotted line (2). In this case, lattice points 1, 7, 8, and 9 are lattice points on the preceding creation surface 50, and lattice points 2 to 6 are target points.

  For example, the target point is configured to be arbitrarily set and changed by the user with respect to the curve approximating unit 23 of the CAD device 2, but the target point is not limited thereto, and for example, the target point is set in advance in the storage unit 3 The curve approximation unit 23 may appropriately read a target point from the storage unit 3.

  In FIG. 7A, the curve approximation unit 23 generates an approximate curve 54 for each of the lattice points 1 to 9, for example. FIG. 7B is a cross-sectional view when the lattice point sequence 53 shown in FIG. 7A is cut in the vertical direction along a straight line in the U direction.

  As described above, the curve approximating unit 23 generates the approximate curve 54 using the least square method. However, the present invention is not limited to this. For example, the approximate curve 54 may be generated using the energy minimizing method or the like. . In addition, it is more preferable that the approximate curve 54 is generated using the least square method as in the present embodiment because the corrected surface region 51 can be generated more smoothly.

  The replacement unit 24 is a specific example of replacement means, and each grid point 52 of each grid point sequence 53 is inserted into the coordinate value that is the closest point on the approximate curve 54 approximated by the curve approximation unit 23. Change (Fig. 8). Furthermore, the replacement unit 24 adds weight (weight) to each lattice point 52 when performing the replacement.

  Each weight includes 0 weight (small weight value), gradually changing weight (weight value gradually changing between 0 weight value and lock weight value), and lock weight (large weight value). Here, 0 weight is a specific example of the first weight value. For example, the small weight value is set so that the lattice point 52 moves closer to the target point when smoothing described later is performed. Yes. The lock weight is a specific example of the second weight value. For example, when the smoothing described later is performed, the large weight value is set so that the lattice point 52 moves greatly from the target point to the vicinity of the preceding creation surface 50. Is set. The gradually changing weight is a specific example of the third weight value. For example, a gradually changing weight value is set from a 0 weight value to a lock weight value.

More specifically, the gradual change weight is set at lattice points 4, 5 and 6 in FIG. 8. The weight value of the grid point 4 is set to a value slightly larger than the 0 weight value, the weight value of the grid point 5 is set to a value slightly larger than the weight value of the grid point 4, and the weight value of the grid point 6 is A value slightly larger than the weight value of the grid point 5 is set.
The values of the 0 weight, the gradual change weight, and the lock weight can be arbitrarily set by the user in advance with respect to the replacement unit 24. However, the present invention is not limited to this. A configuration in which the value of each weight is set and the replacement unit 24 appropriately reads from the storage unit 3 may be employed.

  For example, the replacement unit 24 adds 0 weights to the lattice points 1 to 3, adds gradual change weights to the lattice points 4 to 6, and lock weights to the lattice points 7 to 9. Is added. Note that the weight to be added to each grid point 52 can be arbitrarily set by the user. For example, as will be described later, the connection of each grid point array 53 is set to be smoother. Is preferred. Note that a smoother surface can be generated by increasing the number of lattice points to which the gradually changing weight is added.

  The smoothing unit 25 is a specific example of the smoothing unit, and sequentially searches each grid point sequence 53 and performs approximation using the least square method to perform smoothing. The smoothing unit 25 performs smoothing on each grid point sequence in the U direction and the V direction.

  The smoothing unit 25 generates, for example, a group of three adjacent lattice points 52 (hereinafter referred to as a lattice point group) in each lattice point sequence 53, and performs smoothing on the generated lattice point group. Then, when the smoothing of the lattice point group is completed, the smoothing unit 25 generates a new lattice point group by shifting by one point next to it, and smoothes the generated lattice point group. The smoothing unit 25 repeats generation of such a grid point grape and smoothing of the generated grid point group.

  The smoothing unit 25 generates a group of three lattice points, and after smoothing, shifts one point next to each other to generate a new lattice point group. However, the present invention is not limited to this, and an arbitrary number (at least 3 points) may be generated, or a new lattice point group may be generated by shifting by an arbitrary point.

  For example, the smoothing unit 25 first smoothes the lattice point group (1, 2, 3) (FIG. 9A), and then shifts one point to the right and shifts the lattice point group (2, 3, 2). 4) is generated, and the lattice point group (2, 3, 4) is smoothed (FIG. 9B). Subsequently, the smoothing unit 25 smoothes the lattice point groups (3, 4, 5) (FIG. 9C) and smoothes the lattice point groups (4, 5, 6) (FIG. 9D). , Smoothing of the lattice point group (5, 6, 7) (FIG. 9 (e)), smoothing of the lattice point group (6, 7, 8) (FIG. 9 (f)), lattice point group (7, 8 9) is smoothed (FIG. 9G). As described above, the case where the smoothing unit 25 performs smoothing in one column of the grid point sequence 53 in the U direction has been described. Similarly, the smoothing unit 25 smoothes each grid point sequence 53 in the U direction, and smoothes each grid point sequence 53 in the V direction as in the U direction.

  Further, the smoothing unit 25 executes the smoothing process a plurality of times in each lattice point group. For example, an upper limit value of the number of times of smoothing for performing the smoothing process is set in advance, and when the smoothing unit 25 determines that the number of times of smoothing has reached this upper limit value (predetermined number of times), the next value is shifted by one point. Smoothing is performed on a group of grid points. In addition, although the said smoothing frequency is a structure set with an upper limit as mentioned above, it is not restricted to this, For example, you may set the said smoothing frequency by setting an allowable value. For example, an allowable value is set for the distance between the target point and the smoothed grid point, and the smoothing unit 25 has all or most of the distance of each grid point 52 within the allowable value. Up to smoothing may be repeated.

  As described above, the replacement unit 24 adds a weight to each lattice point 52. Thus, weighting can be performed using the weight when approximation is performed using the least square method. For example, for each grid point 52 to which a small value of 0 weight is added, the amount of movement when smoothing is small, and for each grid point 52 to which a large value of lock weight is added, when smoothed The amount of movement increases. Finally, the smoothing unit 25 reflects the coordinate values after smoothing to each grid point sequence 53 (FIG. 10).

  As described above, the smoothing unit 25 performs smoothing using the least square method, but the smoothing unit 25 is not limited thereto, and may perform smoothing using, for example, an energy minimizing method. In addition, it is more preferable that the smoothing is performed using the least square method as in the present embodiment because the corrected surface region 51 can be generated more smoothly.

  The curved surface generation unit 26 is a specific example of a curved surface generation unit, and generates a parametric curved surface 55 for each grid point sequence 53 smoothed by the smoothing unit 25 (FIG. 11).

The trim unit 27 is a specific example of trim means, and trims the parametric curved surface 55 generated by the curved surface generating unit 26 with a trim boundary line, and the modified surface region 51 in which the connecting portion is smooth with respect to the preceding created surface 50. Is generated (FIG. 12). Here, the trim boundary line is a line where the preceding creation surface 50 and the parametric curved surface 55 intersect.
The curved surface generation unit 26 may generate a nonparametric curved surface for each grid point sequence 53 smoothed by the smoothing unit 25. In this case, the trim unit 27 trims the non-parametric curved surface generated by the curved surface generation unit 26 and generates the corrected surface region 51.

  By the way, in the design surface created in the previous process, since the designer's intention and the flow direction of the surface are regarded as important, there are areas that should not be trimmed in the subsequent process. Therefore, there is a case where the correction surface area 51 that minimizes the correction area needs to be trimmed and connected to the preceding creation surface 50. In addition, the connection condition such as tangent continuity or curvature continuity generally used in healing affects local surface deformation near the connection region, but has no global influence. As a result, there arises a problem that the smoothness of the entire surface cannot be ensured.

  On the other hand, by using the design model generation apparatus 1 according to the present embodiment, the connection boundary can be freely set regardless of the in-plane and surface boundary. Further, by capturing the surface connection problem as global smoothing of the lattice point sequence 53, the smoothness of the entire surface can be ensured. Furthermore, the surface to be generated may be based on a measurement group measured by a three-dimensional measuring instrument or the like, or may be a surface created separately by a CAD device function (for example, a function deformed by an overcrown, a springback, etc.) High nature.

  Next, a design model generation method by the design model generation apparatus according to the present embodiment will be described in detail. FIG. 13 is a flowchart showing a flow of a design model generation method by the design model generation apparatus according to the present embodiment.

  The lattice setting unit 21 reads the preceding creation surface 50 from the storage unit 3, and sets lattice point groups at substantially equal intervals in the U direction and the V direction around the correction surface region 51 of the preceding creation surface 50 and its surroundings (step S101). .

  The inside / outside determination unit 22 determines whether each lattice point 52 of the lattice point group set by the lattice setting unit 21 is inside or outside the correction surface region 51 (step S102).

  The curve approximating unit 23 generates, for each grid point sequence 53, an approximate curve 54 obtained by approximating these passing points using the least square method with the target points and the points on the preceding creation surface as passing points (step S103). .

  The replacement unit 24 replaces each grid point 52 of each grid point sequence 53 with the coordinate value that is the closest point on the approximate curve 54 approximated by the curve approximation unit 23 (step S104). Furthermore, the replacement unit 24 adds weights to the respective lattice points 52 when performing the replacement (step S105).

  The smoothing unit 25 sequentially searches each grid point sequence 53 in the U direction and V direction replaced by the replacement unit 24, performs approximation using the least square method, and performs smoothing (step S106). .

  The curved surface generation unit 26 generates a parametric curved surface 55 for each grid point sequence 53 smoothed by the smoothing unit 25 (step S107).

  The trim unit 27 trims the parametric curved surface 55 generated by the curved surface generation unit 26 with a trim boundary line, and generates a corrected surface region 51 having a smooth connection portion with respect to the previously created surface 50 (step S108).

  The design model generation apparatus 1 according to the present embodiment is used when, for example, in press mold design, mold correction is performed and a measurement point group is converted into a CAD plane using a three-dimensional point group measuring machine. Is possible. Trim boundary connection can be performed in an arbitrary direction with the corrected surface region 51 as a corrected surface region 51 with respect to the previously created surface 50 before correction.

  As described above, in the design model generation apparatus 1 according to the present embodiment, the lattice points 52 are set on and around the correction surface region, and the respective lattice point sequences 53 in the U direction and the V direction are respectively approximated by curves, and the approximate curves thereof. 54, a parametric curved surface 55 is generated, and the generated parametric curved surface 55 is trimmed with a trim boundary line to generate a corrected surface region 51. This makes it possible to generate the entire surface smoothly while performing trim boundary connection.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, in the above-described embodiment, the inside / outside determination, curve approximation, smoothing, curved surface generation, and trim processing are performed for each grid point sequence in the U direction and the V direction. For example, the inside / outside determination, curve approximation, smoothing, curved surface generation, and trim processing may be performed on each grid point sequence in either the U direction or the V direction.

  Further, the present invention can be realized by causing the CPU 2a to execute a computer program, for example, the processing shown in FIG.

  The program may be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W and semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) are included.

  The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

DESCRIPTION OF SYMBOLS 1 Design data generation apparatus 2 CAD apparatus 3 Memory | storage part 4 Display part 21 Lattice setting part 22 Inside / outside determination part 23 Curve approximation part 24 Replacement part 25 Smoothing part 26 Curved surface generation part 27 Trim part

Claims (10)

A design data generation device that generates partial correction data by partially correcting predetermined plane data,
Grid setting means for setting a plurality of grid points on the correction surface data and around the correction surface data;
A curve approximating means for approximating a curve of each grid point row in a predetermined direction set by the grid setting means;
Curved surface generation means for generating a curved surface based on the curve approximated by the curve approximation means;
Trim means for trimming the curved surface at a trim boundary line where the curved surface generated by the curved surface generating means and the predetermined surface data intersect to generate the corrected surface data;
Determination means for determining whether the grid point is on the outside or the inside of the correction surface data;
Replacement means for replacing each grid point with the closest point on the curve approximated by the curve approximation means;
Smoothing means for smoothing the rows of the lattice points replaced by the replacement means,
The curve approximation means performs the curve approximation with respect to each outer grid point determined by the determination means in the row of each grid point and a target point that is a target of correction surface data, and Generating a curved surface based on the sequence of the grid points smoothed by the smoothing means;
The smoothing means sequentially searches and approximates the sequence of each grid point, performs smoothing, and performs weighting using a weight value for each grid point given by the replacement means when performing the approximation. ,
The replacement means performs the smoothing with a first weight value with a small moving amount of each grid point when the smoothing is performed on the inner grid point determined by the determination means. A third weight value that is set so as to gradually change between the second weight value where the amount of movement of each grid point is large ,
A design data generation apparatus characterized by that. The design data generation device according to claim 1 ,
The replacement means assigns a weight to each grid point,
The smoothing means sequentially searches the sequence of the lattice points, approximates and smoothes using a least square method,
A design data generation device characterized in that weighting is performed using a weight for each lattice point given by the replacement means when approximation is performed using the least square method. The design data generation device according to claim 1 or 2 ,
The smoothing means generates a group of a predetermined number of adjacent grid points in each grid point sequence, smoothes the generated grid point groups, and finishes the smoothing of the grid point groups. Then, the design data is characterized in that the group of lattice points is newly generated by shifting by a predetermined point next to the group, the generated group of lattice points is smoothed, and the generation and smoothing of the group are repeated. Generator. The design data generation device according to claim 3 ,
The design data generation apparatus characterized in that the smoothing means executes the smoothing a predetermined number of times for each group of a predetermined number of lattice points. The design data generation device according to any one of claims 1 to 3 ,
The smoothing means performs the smoothing a plurality of times for each group of a predetermined number of grid points, and the distance between the target point to be corrected surface data and each of the smoothed grid points is The design data generating device, wherein the smoothing is terminated when the value falls within an allowable value. The design data generation device according to any one of claims 1 to 5 ,
The design data generation apparatus characterized in that the curve approximation means performs the curve approximation using a least square method. The design data generation device according to any one of claims 1 to 6 ,
A design data generating apparatus, further comprising storage means for storing at least one of the predetermined surface data and the corrected surface data. The design data generation device according to any one of claims 1 to 7 ,
The design data generation apparatus further comprising display means for displaying at least one of the corrected surface data and the predetermined surface data. A generation method by a design data generation device that generates partial correction data by partially correcting predetermined plane data,
Setting a plurality of grid points on the correction surface data and around the correction surface data by a grid setting means ;
A curve approximation means for approximating a line of the grid points in the set predetermined direction with a curve approximation means ;
Generating a curved surface by curved surface generation means based on the approximated curve;
Trimming the curved surface at a trim boundary line where the generated curved surface and the predetermined surface data intersect, and generating the corrected surface data by trim means ;
A step of determining by the determining means whether the grid points are outside or inside the correction surface data;
Replacing each grid point by a replacement means with the closest point on the approximated curve;
Smoothing a row of the replaced grid points by a smoothing means,
The curve approximation means performs the curve approximation with respect to each outer grid point determined by the determination means in the row of each grid point and a target point that is a target of correction surface data, and Generating a curved surface based on the sequence of the grid points smoothed by the smoothing means;
The smoothing means sequentially searches and approximates the sequence of each grid point, performs smoothing, and performs weighting using a weight value for each grid point given by the replacement means when performing the approximation. ,
The replacement means performs the smoothing with a first weight value with a small moving amount of each grid point when the smoothing is performed on the inner grid point determined by the determination means. A third weight value that is set so as to gradually change between the second weight value where the amount of movement of each grid point is large ,
A generation method by a design data generation apparatus characterized by the above . A program of a design data generation device that generates partial correction data by partially correcting predetermined plane data,
A process of setting a plurality of grid points on the correction surface data and around the correction surface data;
Processing for approximating a curve of the set of grid points in the set predetermined direction;
Generating a curved surface based on the approximated curve;
A process of trimming the curved surface at a trim boundary line where the generated curved surface and the predetermined surface data intersect to generate the corrected surface data;
A process of determining whether the grid point is on the outside or the inside of the correction surface data;
A process of replacing each grid point with the closest point on the approximated curve;
And causing the computer to execute a process of smoothing the row of the replaced grid points ,
The smoothed row of grid points obtained by performing the curve approximation with respect to each of the determined outside grid points in the row of grid points and the target point that is the target of the correction surface data Generates a curved surface based on
The sequence of each grid point is sequentially searched and approximated and smoothed, and when performing the approximation, weighting is performed using a weight value for each grid point given by the replacement means ,
A first weight value with a small moving amount of each lattice point when the smoothing is performed on the determined inner lattice point, and a moving amount of each lattice point when the smoothing is performed. A third weight value set so as to gradually change between the second weight value and the
A program of a design data generation apparatus characterized by the above.

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