JP6694630B1 - CAE accuracy presentation system and CAE accuracy presentation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable accuracy verification of three-dimensional shape data acquired by CAE. SOLUTION: Among the point cloud data of the three-dimensional shape data generated by CAE and the point cloud data of the three-dimensional shape data of the actual molded product acquired by the three-dimensional shape measuring device 6, points corresponding to each other. To calculate the distance. The calculated distance is presented to the user as the accuracy of the three-dimensional shape data generated by CAE. [Selection diagram] Figure 2

Description

  The present invention relates to a CAE accuracy presentation system and a CAE accuracy presentation method that enable CAE accuracy verification based on three-dimensional shape data acquired by CAE and measurement data acquired by measuring an actual molded product. ..

  2. Description of the Related Art Conventionally, CAE (Computer Aided Engineering), which enables virtual prototyping and virtual testing by reading CAD (Computer Aided Design) data and setting various conditions, has been used in actual design and development sites.

  Patent Document 1 discloses a CAD data processing device that acquires accurate CAD data using position data obtained by measuring a three-dimensional model. In this CAD data processing device, first, a three-dimensional model of a product is created from CAD data. The characteristics of the three-dimensional model are tested and, if necessary, the shape is manually corrected, and then the three-dimensional model is measured by a three-dimensional scanner to obtain point cloud data. The parameters in the CAD data are corrected so as to match the point cloud data within a predetermined range, and new CAD data is obtained. Correct new CAD data corresponding to the three-dimensional model can be acquired by correcting the parameters of the plurality of unit shape elements in the CAD data based on the measurement result of the three-dimensional model.

  In addition, Patent Document 2 discloses an inverse design processing system that uses three-dimensional scan data. In the system of Patent Document 2, a part of the product formed from the three-dimensional scan data is remodeled, and an operation of operating the part of the product formed from the three-dimensional scan data is selected, which results from the selected work. It is configured to measure the loss of precision and show it to the user.

  In addition, Patent Document 3 discloses a model comparison device that compares a reference three-dimensional model with a large number of three-dimensional models. In this device, a confidence level is calculated between a reference three-dimensional model and a large number of three-dimensional models according to the similarity and dissimilarity of geometric characteristics, and the obtained confidence level is used to calculate a similarity value. Is configured to.

JP, 2003-242186, A JP, 2007-305131, A Japanese Patent Publication No. 2017-504108

  By the way, assuming, for example, that a resin sheet is molded into a three-dimensional product, a mold can be created by a machining center or the like based on the CAD data of the product, and the resin sheet can be molded by this mold to obtain the product. .. When creating a mold based on the CAD data of the product, it is necessary to make various settings such as setting the material model, setting the heating process of the resin sheet, setting the molding process, etc. There will be subtle differences. Further, usually, a mold for mass production is created by repeating a plurality of trial manufactures and a mold correction work.

  Since it takes a lot of time and effort to create a mold as described above, there is a method of performing a virtual prototype by CAE based on CAD data. However, even in the case of trial production using CAE, it is necessary to set various conditions, and the trial production result finally obtained may differ from the shape of the product obtained by actual molding. .. If the trial production result obtained by CAE is different from the actual shape of the product, the trial production result by CAE cannot be utilized, so that accuracy verification is required.

  However, in the patent document 1, the CAD data and the scan measurement data are collated, but the CAD data is only corrected by the scan measurement data. In the patent document 2, the CAD data and the scan measurement data are corrected. However, the system of Patent Documents 1 and 2 cannot verify the accuracy of the three-dimensional shape data acquired by CAE because it only indicates the loss of accuracy during data editing.

  Further, in Patent Document 3, the confidence level is set between the reference three-dimensional model and a large number of three-dimensional models, and the similarity value is calculated, but this is for the purpose of data retrieval and accuracy verification is performed. Not because.

  If the accuracy verification of the three-dimensional shape data acquired by the CAE can be performed, the result can be reflected in the condition setting of the CAE and the like, whereby the CAE can perform a virtual prototype with higher accuracy.

  The present invention has been made in view of the above point, and an object thereof is to enable accuracy verification of three-dimensional shape data acquired by CAE.

  In order to achieve the above object, according to the present invention, the distance between points corresponding to each other in the point cloud data of the three-dimensional shape data generated by CAE and the point cloud data of the three-dimensional shape data of the actual molded product. Was calculated and the distance was presented to the user as the accuracy of CAE.

  A first invention is a CAE accuracy verification based on three-dimensional shape data of a molded product acquired by CAE based on CAD data and measurement data acquired by measuring an actually molded actual molded product. It is assumed that the CAE accuracy presentation system that enables

A CAE execution unit that reads the CAD data, accepts a plurality of condition settings, and generates three-dimensional shape data including point cloud data indicating the shape of the molded product based on the CAD data and the conditions, and the CAD. A three-dimensional shape measuring unit that obtains three-dimensional shape data including point cloud data indicating the shape of an actual molded product molded by a mold created based on the data, and the three-dimensional shape generated by the CAE execution unit. Of the point cloud data of the data and the point cloud data of the three-dimensional shape data acquired by the three-dimensional shape measuring section, a distance calculating section that calculates a distance between mutually corresponding points and a distance calculating section. The CAE executing unit includes a precision presenting unit that presents the determined distance to the user as the precision of the three-dimensional shape data generated by the CAE executing unit, and the CAE executing unit is a flat plane in which many points are drawn at equal intervals. Three-dimensional shape data including coordinates of the points of the virtual molded product obtained by molding the resin sheet is generated, and the three-dimensional shape measuring unit is obtained by molding the resin sheet with the mold. The three-dimensional shape data including the coordinates of the points of the actual molded product is acquired, and the distance calculation unit calculates the coordinates of the points of the three-dimensional shape data generated by the CAE execution unit and the three-dimensional shape measurement unit. characterized that you calculate the distance between points corresponding to each other based on the in the point of obtaining three-dimensional shape data in coordinates.

  According to this configuration, the CAE execution unit reads the CAD data of the molded product, virtually executes the prototype of the molded product based on the plurality of set conditions, and sets the point cloud data indicating the shape of the molded product. 3D shape data including is generated. On the other hand, a mold is created based on the CAD data, an actual molded product is molded by this mold, and three-dimensional shape data including point cloud data indicating the shape of the actual molded product is acquired by the three-dimensional shape measuring unit.

  Then, the distance calculation unit includes the point cloud data included in the three-dimensional shape data indicating the shape of the virtual prototype generated by the CAE execution unit and the point cloud data included in the three-dimensional shape data indicating the shape of the actual molded product. The distance between points corresponding to each other is calculated. Since both data are three-dimensional data, the distance between the points of both data can be calculated by the three-dimensional space coordinates.

  Then, the calculated distance can be presented to the user as the accuracy of the three-dimensional shape data generated by the CAE execution unit. That is, the longer the distance calculated by the distance calculation unit, the larger the shape difference between the virtual prototype created by the CAE execution unit and the actual molded product. In this case, the CAE execution unit It can be judged that the accuracy of the generated three-dimensional shape data is low. On the other hand, the shorter the distance calculated by the distance calculation unit is, the smaller the shape difference between the virtual prototype generated by the CAE execution unit and the actual molded product is. In this case, the CAE execution unit It can be determined that the generated three-dimensional shape data has high accuracy.

In addition , a molded product formed by molding a flat resin sheet in which a large number of points are drawn at equal intervals has a large number of points, and the point interval of the portion where the resin sheet extends during molding is wide and The point spacing becomes narrower. This has the same tendency whether it is a virtual molded product or an actual molded product.

  By calculating the distance between points corresponding to each other based on the coordinates of the points of the three-dimensional shape data generated by the CAE execution unit and the coordinates of the points of the three-dimensional shape data acquired by the three-dimensional shape measurement unit. , The calculated value of the distance becomes accurate.

In a second aspect, the CAE executing unit generates three-dimensional shape data including coordinates of the points of a virtual molded product obtained by molding the resin sheet in which identification information is given to a large number of the points. It is characterized by doing.

  According to this configuration, since the identification information is given to the points drawn on the resin sheet before molding, even if the relative positional relationship between the points greatly changes after molding, the original information based on the identification information is used. It is possible to grasp the relative positional relationship of. This makes it easier to identify the corresponding points among the points of the three-dimensional shape data generated by the CAE execution unit and the points of the three-dimensional shape data acquired by the three-dimensional shape measurement unit, and the distance thereafter. The calculated value of becomes accurate.

In a third aspect, the accuracy presenting unit displays the shape of the virtual molded product based on the three-dimensional shape data generated by the CAE execution unit, and the distance between the corresponding points on the virtual molded product. Is displayed by changing the color.

  That is, the distance between corresponding points indicates the accuracy of CAE. For example, by displaying different colors when the distance between corresponding points is short and when the distance is long, the CAE accuracy at that point is improved. The user can easily grasp it visually.

In a fourth invention, the distance calculation unit calculates at least one of an average value of distances between the corresponding points of a plurality of sets and a distance standard deviation, and the accuracy presentation unit calculates the average value. , And at least one of the distance standard deviations is presented to the user.

  That is, generally, there are a plurality of sets of corresponding points, and based on the average value or standard deviation of these distances, it is possible to grasp the overall tendency of accuracy.

A fifth invention is a CAE accuracy verification based on three-dimensional shape data of a molded product acquired by CAE based on CAD data and measurement data acquired by measuring an actually molded actual molded product. It is assumed that the CAE accuracy presentation method that enables

A CAE executing step of reading the CAD data, receiving a plurality of condition settings, and generating three-dimensional shape data including point cloud data indicating a shape of a molded product based on the CAD data and the conditions, and the CAD. A three-dimensional shape measuring step of acquiring three-dimensional shape data including point cloud data indicating the shape of an actual molded product molded by a mold created based on the data, and the three-dimensional shape generated in the CAE executing step. Of the point cloud data of the data and the point cloud data of the three-dimensional shape data acquired in the three-dimensional shape measuring step, a distance calculating step of calculating a distance between mutually corresponding points and a distance calculating step of calculating the distance. An accuracy presenting step of presenting the distance thus calculated to the user as the accuracy of the three-dimensional shape data generated in the CAE executing step, in the CAE executing step, a number of flat points are drawn at equal intervals. Three-dimensional shape data including coordinates of the points of the virtual molded product obtained by molding the resin sheet is generated, and in the three-dimensional shape measuring step, the resin sheet is molded by the mold and obtained. Obtaining three-dimensional shape data including the coordinates of the points of the actual molded product, and in the distance calculating step, the coordinates of the points of the three-dimensional shape data generated in the CAE executing step and the three-dimensional shape measuring step. characterized that you calculate the distance between points corresponding to each other based on the in the point of obtaining three-dimensional shape data in coordinates.

  According to the present invention, the point cloud data included in the three-dimensional shape data indicating the shape of the virtual prototype generated by the CAE execution unit and the point cloud data included in the three-dimensional shape data indicating the shape of the actual molded product. Among them, the distances between points corresponding to each other can be calculated, and the calculated distances can be presented to the user as the accuracy of the three-dimensional shape data generated by the CAE execution unit. It is possible to verify the accuracy of the dimensional shape data.

FIG. 1 is a schematic diagram showing the configuration of a CAE accuracy presentation system according to an embodiment of the present invention. FIG. 2 is a block diagram of the CAE accuracy presentation system according to the embodiment of the present invention. FIG. 3 is a flowchart showing an example of the procedure of the CAE accuracy presentation method according to the embodiment of the present invention. FIG. 4 is a flowchart showing details of the setting of the input condition. FIG. 5A shows an example of CAD data and is an end view of a molded product. FIG. 5B shows an example of CAD data and is a side view of a molded product. FIG. 6 is a perspective view of a resin sheet that is a raw material for an actual molded product. FIG. 7 is a perspective view of an actual molded product. FIG. 8A is an end view showing the point cloud data indicating the shape of the actual molded product acquired by the three-dimensional shape measuring apparatus. FIG. 8B is a side view showing the point cloud data showing the shape of the actual molded product acquired by the three-dimensional shape measuring apparatus. FIG. 9 is a diagram showing an example of the format of data indicating the position of a point acquired by the three-dimensional shape measuring apparatus. FIG. 10 is a diagram showing an example of a user interface screen for inputting various kinds of information set when executing CAE. FIG. 11 is a diagram showing an example in which a mesh (lattice points) is formed on a virtual resin sheet. FIG. 12A is an end view showing point cloud data showing the shape of a virtual molded product generated by CAE. FIG. 12B is a side view showing point cloud data showing the shape of the virtual molded product generated by CAE. FIG. 13 is a diagram showing an example of the format of the distance data calculated by the distance calculation unit. FIG. 14A is a diagram showing output data in which the color is changed according to the distance between the points. FIG. 14B is a diagram showing output data including an average value of distances and a standard deviation of distances. FIG. 15 is a diagram showing an example of an image presented to the user in the accuracy presentation step.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely an example in essence, and is not intended to limit the present invention, its application, or its application.

  FIG. 1 is a schematic diagram showing a configuration of a CAE accuracy presentation system 1 according to an embodiment of the present invention, and FIG. 2 is a block diagram of the CAE accuracy presentation system 1. As shown in FIG. 1, the CAE accuracy presentation system 1 includes a control device 2, a display unit 3, a keyboard 4, a mouse 5, and a three-dimensional shape measuring device (three-dimensional shape measuring unit) 6. .. The CAE accuracy presentation system 1 is a CAE accuracy based on three-dimensional shape data of a molded product acquired by CAE based on CAD data and measurement data acquired by measuring an actually molded actual molded product. It is a system that enables verification. The molded product may be, for example, a vacuum molded product obtained by vacuum molding a resin sheet, but is not limited to this, and a molded product using various molds may be used.

(Configuration of three-dimensional shape measuring device)
The three-dimensional shape measuring device 6 is a three-dimensional scanner that can measure the three-dimensional shapes of various members in a non-contact manner, and a conventionally known one can be used. As shown in FIG. 2, the three-dimensional shape measuring apparatus 6 can be configured to include, for example, a sensor head unit 7 and a processing unit 8. However, the sensor head unit 7 and the processing unit 8 are integrated. The device may be an integrated device or a device in which the sensor head unit 7 and the processing unit 8 can be separately arranged as separate bodies.

  The sensor head unit 7 includes a light projecting unit 7a that irradiates the measurement target with light (including laser light) and a light receiving unit 7b that receives the light reflected from the measurement target. 7 a and the light receiving unit 7 b are connected to the processing unit 8. The method of measuring the three-dimensional shape by the sensor head unit 7 is not particularly limited, but conventionally known methods such as the phase shift method (phase shift method), the spatial code method, the stereo method, and the triangulation method can be used. Can be used. Light corresponding to each method can be emitted from the light projecting unit 7a to the measurement target, and the light reflected from the measurement target at that time can be received by the light receiving unit 7b. The light projecting unit 7a is controlled by the processing unit 8, and the information on the intensity of the light received by the light receiving unit 7b is output to the processing unit 8. The processing unit 8 can acquire the three-dimensional shape of the measurement target, that is, the three-dimensional coordinates of each point forming the surface of the measurement target, based on the information regarding the intensity of the light received by the light receiving unit 7b.

  The three-dimensional shape measuring device 6 may or may not be connected to the control device 2. When the three-dimensional shape measuring device 6 is connected to the control device 2, the three-dimensional shape data including the point cloud data indicating the shape of the measurement object acquired by the three-dimensional shape measuring device 6 is sent to the control device 2. Can be output. When the three-dimensional shape measuring device 6 is not connected to the control device 2, the three-dimensional shape data including the point cloud data indicating the shape of the measurement target acquired by the three-dimensional shape measuring device 6 is stored in various storage media. Can be input to the control device 2 via.

(Structure of display)
The display unit 3 is composed of, for example, a liquid crystal display or the like, and is connected to the control device 2. The display unit 3 is controlled by the control device 2 and can display various information, images, user interface screens, and the like to present to the user. The display unit 3 can also display the three-dimensional shape of the molded product generated from the CAD data, the three-dimensional shape of the molded product generated from the three-dimensional shape data of the molded product acquired by CAE based on the CAD data, and the like. Is.

(Structure of input operation device)
The keyboard 4 and the mouse 5 are input operation devices for inputting various kinds of information and setting operations, and are connected to the control device 2. The operation signals of the keyboard 4 and the mouse 5 are input to the control device 2 so that the control device 2 can grasp what operation the user is performing. The input operation device may be a touch operation panel or the like.

(Structure of storage device)
The storage device 21 is composed of, for example, a hard disk drive, a solid state drive, or the like, and is configured to be able to store various data. The storage device 21 may be an external storage device provided outside the control device 2, an internal storage device provided inside the control device 2, or a combination thereof. May be. In the storage device 21, in addition to the operating system, an application program for executing each function of the CAE accuracy presentation system 1, CAD data input from the outside, various images, a CAD application program, a CAE application program, a spreadsheet application program. Etc. can be stored. The data and the like of the storage device 21 can be read into the control device 2 and the data and the like generated by the control device 21 can be stored in the storage device 21 as necessary.

(Configuration of control device)
The control device 2 can be configured by, for example, a general-purpose personal computer or the like, but may be configured by dedicated hardware. The control device 2 includes a central processing unit (CPU), RAM, ROM, etc., executes various application programs on the operating system, performs various calculations by reflecting the operation state of the input operation device, and calculates It is configured so that the result obtained can be stored in the storage device 21 or displayed on the display unit 3. Various functions executed by the control device 2 will be described based on a flowchart described later.

  The control device 2 includes, for example, a CAE execution unit 22, a distance calculation unit 23, and an accuracy presentation unit 24. The CAE execution unit 22, the distance calculation unit 23, and the accuracy presentation unit 24 are units formed as software by the control device 2 executing various application programs, and even if they do not exist as an entity such as hardware. Good. The CAE execution unit 22, the distance calculation unit 23, and the accuracy presentation unit 24 may be configured by hardware or the like.

  Although details will be described later, an outline of the CAE executing unit 22, the distance calculating unit 23, and the accuracy presenting unit 24 will be described. The CAE execution unit 22 is a unit that reads CAD data, accepts a plurality of condition settings, and generates three-dimensional shape data including point cloud data indicating the shape of a molded product based on the CAD data and the accepted conditions. By executing the CAE application program by the control device 2, the molded product is virtually prototyped to generate a virtual prototype, and the three-dimensional shape data of the virtual prototype is acquired. The CAE application program may be a program corresponding to vacuum forming of a resin sheet, and a general-purpose program can also be used.

  The distance calculation unit 23, among the point cloud data of the three-dimensional shape data generated by the CAE execution unit 22 and the point cloud data of the three-dimensional shape data acquired by the three-dimensional shape measuring device 6, points corresponding to each other. This is a part for calculating the distance between each other.

  The accuracy presenting unit 24 is a unit that presents the distance calculated by the distance calculating unit 23 to the user as the accuracy of the three-dimensional shape data generated by the CAE executing unit 22. In this embodiment, the accuracy of the three-dimensional shape data can be presented via the display unit 3.

(CAE accuracy presentation processing)
FIG. 3 is a flowchart showing a processing procedure of a CAE accuracy presentation method performed using the CAE accuracy presentation system 1. In step SA1 after the start, CAD data of the molded product is input to the control device 2. An example of CAD data is shown in FIGS. 5A and 5B. The inputted CAD data can be stored in the storage device 21. The CAD data may be data created by an external system or may be data created by the control device 2 of the CAE accuracy presentation system 1. The illustrated CAD data is an example, and the present invention is not limited to this. Moreover, the format of the CAD data is not particularly limited.

  In step SA2, in addition to the CAD data input to the control device 2, a vacuum-molding die for vacuum-molding a molded product is created based on the CAD data. When a die is created based on CAD data, various settings such as setting of a material model, setting of a heating process of a resin sheet, setting of a molding process are performed. After setting, CAD data can be input to a machine tool such as a machining center to create a mold for a molded product. Since this method is well known, detailed description will be omitted. The shape of the mold is modified based on a test conducted in advance, and the shape is optimized.

  After creating the mold, the process proceeds to step SA3. In step SA3, the material for the molded product is prepared. As shown in FIG. 6, the material is a flat resin sheet 30 made of a thermoplastic resin. The thickness and size of the resin sheet 30 are determined in advance according to the shape and size of the molded product. The material of the resin sheet 30 can also be determined in advance according to the strength required for the molded product. A frame line 31, a marker 32, a large number of dots 33, and the like are printed on the surface of the resin sheet 30. The frame line 31 can be rectangular. The markers 32 are arranged outside the frame line 31 at regular intervals. The points 33 are arranged in the frame line 31 at equal intervals in the vertical and horizontal directions. The interval between the adjacent points 33 can be set to, for example, about 1 mm, but is not limited to this, and is preferably set to a range of, for example, about 0.5 mm to 2 mm. The larger the molded product, the wider the interval between the adjacent points 33, and the smaller the molded product, the smaller the interval between the adjacent points 33. The color of the resin sheet 30 is dark, for example, black, and the frame line 31, the marker 32, and the many dots 33 are bright, for example, white.

  After preparing the material, the process proceeds to step SA4. In step SA4, the resin sheet prepared in step SA3 is vacuum-formed under preset conditions. The vacuum forming conditions include the heating temperature of the resin sheet, the mold operation timing, the forming time, the vacuuming timing, and the like, and these conditions are set to the optimum conditions by a test conducted in advance.

  In step SA5, after vacuum forming, an actual molded product 100 as shown in FIG. 7 is obtained. Although not shown in FIG. 7, a large number of points 33 shown in FIG. 6 are present on the surface of the actual molded product 100, and when the resin sheet 30 is contracted, the intervals between the adjacent points 33 are narrowed, and When the sheet 30 extends, the space between the adjacent points 33 is widened.

  Then, it progresses to step SA6. In step SA6, the three-dimensional shape measuring device 6 measures the three-dimensional shape of the actual molded product 100. For example, as shown in FIG. 1, the actual molded product 100 is placed under the sensor head portion 7 of the three-dimensional shape measuring apparatus 6, and the measuring light is emitted from the light projecting portion 7a of the sensor head portion 7 to the actual molded product 100. The light that has been irradiated and reflected from the surface of the actual molded product 100 is received by the light receiving unit 7b, and the processing unit 8 calculates the shape measurement. This step is the three-dimensional shape measuring step.

  Then, in step SA7, as shown in FIGS. 8A and 8B, three-dimensional shape data including point cloud data indicating the shape of the actual molded product 100 is acquired. An example of the data format is shown in FIG. 9, and the position of a certain point can be displayed in X coordinate, Y coordinate, and Z coordinate. This point also includes the point 33 printed on the resin sheet 30 in step SA3. The above steps SA2 to SA7 are processes related to actual forming in which the resin sheet 30 is actually vacuum formed.

  On the other hand, steps SA8 to SA10 are processes related to CAE, which are sequentially executed by the CAE execution unit 22 shown in FIG. In step SA8, the CAD data is read, and then the input condition is set. Specifically, as shown in the flowchart of FIG. 4, the sheet mesh input data is set in step SB1 after the start. The sheet mesh is a mesh formed on the virtual resin sheet 30A as shown in FIG. When setting the sheet mesh input data, the CAE execution unit 22 generates the input user interface screen 40 as shown in FIG. 10 and displays it on the display unit 3. Note that a large number of points may be formed instead of the mesh.

  The input user interface screen 40 includes a coordinate input section 40a for inputting mesh start point coordinates, a mesh size input section 40b for inputting a mesh size to be formed, and a sheet thickness input section 40c for inputting a sheet thickness. It is provided. The X-coordinate, the Y-coordinate, and the Z-coordinate can be input to the coordinate input unit 40a. Here, the X direction and the Y direction are directions along the surface of the virtual resin sheet 30A, and the Z direction is a direction along the thickness direction of the virtual resin sheet 30A.

  In the mesh size input unit 40b, the number of grid points in the X direction and the number of grid points in the Y direction can be individually input, and the grid spacing can also be input. The number of lattice points and the lattice spacing are set equal to the number and spacing of the dots 33 (shown in FIG. 6) printed in step SA3 during actual molding.

  After setting the sheet mesh input data as described above, the process proceeds to step SB2 of the flowchart shown in FIG. In step SB2, a sheet mesh as shown in FIG. 11 is generated based on the data input in step SB1. The points where the vertical lines and the horizontal lines intersect are grid points, and the grid points correspond to the points 33 (shown in FIG. 6) printed in step SA3. If no mesh is formed, dots will be formed.

  At step SB2, identification information is given to all grid points. The identification information is information that can distinguish a certain grid point from other grid points, and examples thereof include an ID number. The identification information can be composed of, for example, numbers, symbols, characters, etc., and can also be composed of a combination thereof. The grid points and their identification information can be stored in the storage device 21 in association with each other.

  Further, in step SB2, the grid points to which the identification information is added are arranged in order. If the identification information is a number, the grid points can be arranged in order from the smallest number to the largest number. Further, for example, the grid point located at the top of the right end may be number 1.

  After the sheet mesh is generated, the process proceeds to step SA9 in the flowchart shown in FIG. 3, where CAE calculation processing is executed to perform a virtual prototype. That is, the CAE execution unit 22 generates three-dimensional shape data including the coordinates of the lattice points of the virtual molded product, which is obtained by molding the virtual resin sheet 30A in which the identification information is given to a large number of lattice points. This step is the CAE execution step. For the CAE execution step itself, a conventionally known method can be used.

  Then, it progresses to step SA10 and acquires the three-dimensional shape data generated by CAE. The acquired three-dimensional shape data is shown in FIGS. 12A and 12B. 12A and 12B show grid points.

  In step SA11, the distance calculation unit 23 is based on the coordinates of the lattice points of the three-dimensional shape data generated by the CAE execution unit 22 and the coordinates of the points of the three-dimensional shape data acquired by the three-dimensional shape measuring device 6. Then, the distance between points corresponding to each other is calculated. At this time, when focusing on a pair of points corresponding to each other, each point is specified by the X coordinate, the Y coordinate, and the Z coordinate. Therefore, based on these coordinates, the distance between the points corresponding to each other is calculated in the three-dimensional space. Can be calculated above. FIG. 13 is a diagram showing an example of the format of the distance data calculated by the distance calculation unit 23, and the distance (“Dis” in FIG. 13) can be displayed for each point based on the identification information. This step is the distance calculation step. The distance calculation is executed for all pairs of points.

  Here, there are a large number of lattice points that make up the three-dimensional shape data generated by the CAE execution unit 22, and there are also many points that make up the three-dimensional shape data acquired by the three-dimensional shape measuring apparatus 6. When the points corresponding to each other are obtained, since the identification information is given in advance, the identification information can be used to make a distinction.

  Further, the point group based on the three-dimensional shape data acquired by the three-dimensional shape measuring device 6 and the point group based on the three-dimensional shape data generated by the CAE execution unit 22 are overlapped to obtain points corresponding to each other. You can For example, the distance between the point based on the three-dimensional shape data acquired by the three-dimensional shape measuring device 6 and the point based on the three-dimensional shape data generated by the CAE execution unit 22 is less than or equal to a predetermined value and may be close to each other. For example, these points can correspond to each other.

  After calculating the distance between the corresponding points in step SA11, the process proceeds to step SA12. In step SA12, output data is created. The output data can be created for each point, and for example, as shown in FIG. 14A, the color can be changed according to the distance. In FIG. 14A, “R” is red, “G” is green, and “B” is blue. If the distance is “0”, the point can be colored red, if the distance is “2” (mm), the point can be colored green, and if the distance is “4”, the point can be colored blue. However, this is an example of coloring, for example, shorter distance makes it red, longer makes it blue, and vice versa, and shorter makes it white, black makes it longer, The opposite can also be done.

  Further, as shown in FIG. 14B, the distance calculation unit 23 can calculate an average value of distances between corresponding points of a plurality of sets and a distance standard deviation. Only one of the average value and the standard deviation may be calculated. The distance calculation unit 23 can also perform other statistical calculations.

  After that, the process proceeds to step SA13 of the flowchart shown in FIG. The display process is performed by the accuracy presenting unit 24. The longer the distance calculated by the distance calculation unit 23 is, the larger the shape difference between the virtual prototype created by the CAE execution unit 22 and the actually molded product is. In this case, , It can be determined that the accuracy of the three-dimensional shape data generated by the CAE execution unit 22 is low. On the other hand, the shorter the distance calculated by the distance calculation unit 23, the smaller the shape difference between the virtual prototype generated by the CAE execution unit 22 and the actual molded product generated by the CAE execution unit 22. Yes, in this case, it can be determined that the accuracy of the three-dimensional shape data generated by the CAE execution unit 22 is high. As a material for this determination, the precision presentation unit 24 generates an image based on the output data generated in step SA12 and displays it on the display unit 3. This step is the accuracy presentation step.

  As shown in FIG. 15, the accuracy presentation unit 24 displays the shape of the virtual molded product based on the three-dimensional shape data generated by the CAE execution unit 22 and also the distance between corresponding points on the virtual molded product. Is displayed in heat map format by changing the color. By looking at this image, the user can visually understand the high-precision portion and the low-precision portion of the virtual molded product.

  The precision presenting unit 24 can display the average value on the display unit 3 and present it to the user when the distance calculating unit 23 is calculating the average value. Further, the accuracy presenting unit 24 can display the distance standard deviation on the display unit 3 and present it to the user when the distance calculating unit 23 is calculating the distance standard deviation.

(Operation and effect of the embodiment)
As described above, according to this embodiment, the point cloud data of the three-dimensional shape data indicating the shape of the virtual prototype generated by the CAE execution unit 22 and the shape of the actually molded actual molded article 3 are shown. The distance calculation unit 23 can calculate the distance between points corresponding to each other in the point cloud data of the dimensional shape data. Since the distance calculated by the distance calculation unit 23 can be presented to the user as the accuracy of the 3D shape data generated by the CAE execution unit 22, the accuracy of the 3D shape data acquired by CAE is verified. be able to.

  The above-described embodiments are merely examples in all respects, and should not be limitedly interpreted. Furthermore, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the CAE accuracy presentation system and the CAE accuracy presentation method according to the present invention can be used, for example, when performing CAE accuracy verification when vacuum forming a resin sheet.

1 CAE accuracy presentation system 6 3D shape measuring device (3D shape measuring unit)
22 CAE Execution Unit 23 Distance Calculation Unit 24 Accuracy Presentation Unit 30 Resin Sheet 33 Points 100 Real Molded Product

Claims (5)

CAE accuracy that enables CAE accuracy verification based on three-dimensional shape data of a molded product acquired by CAE based on CAD data and measurement data acquired by measuring an actual molded product In the presentation system,
A CAE execution unit that reads the CAD data, accepts a plurality of condition settings, and generates three-dimensional shape data including point cloud data indicating the shape of the molded product based on the CAD data and the conditions,
A three-dimensional shape measuring unit that acquires three-dimensional shape data including point group data indicating the shape of an actual molded product molded by a mold created based on the CAD data;
Of the point cloud data of the three-dimensional shape data generated by the CAE executing unit and the point cloud data of the three-dimensional shape data acquired by the three-dimensional shape measuring unit, the distance between points corresponding to each other is calculated. A distance calculation unit,
An accuracy presenting unit that presents the distance calculated by the distance calculating unit to the user as the accuracy of the three-dimensional shape data generated by the CAE executing unit ,
The CAE executing unit generates three-dimensional shape data including coordinates of the points of a virtual molded product obtained by molding a flat resin sheet in which a large number of points are drawn at equal intervals,
The three-dimensional shape measuring unit acquires three-dimensional shape data including coordinates of the points of the actual molded product obtained by molding the resin sheet with the mold,
The distance calculation unit corresponds to each other based on the coordinates of the points of the three-dimensional shape data generated by the CAE execution unit and the coordinates of the points of the three-dimensional shape data acquired by the three-dimensional shape measurement unit. CAE accuracy presentation system characterized that you calculate the distance between the point of. In the CAE accuracy presentation system according to claim 1 ,
The CAE execution unit is configured to generate three-dimensional shape data including coordinates of the points of a virtual molded product obtained by molding the resin sheet in which a large number of points are provided with identification information. CAE accuracy presentation system. In the CAE accuracy presentation system according to claim 1 or 2 ,
The accuracy presenting unit displays the shape of the virtual molded product based on the three-dimensional shape data generated by the CAE execution unit, and displays the distance between the corresponding points on the virtual molded product by changing the color. A CAE accuracy presentation system characterized by: The CAE accuracy presentation system according to any one of claims 1 to 3 ,
The distance calculation unit calculates at least one of an average value of distances between the corresponding points of a plurality of sets and a distance standard deviation,
The CAE accuracy presentation system, wherein the accuracy presentation unit presents at least one of the average value and the distance standard deviation to a user. CAE accuracy that enables CAE accuracy verification based on three-dimensional shape data of a molded product acquired by CAE based on CAD data and measurement data acquired by measuring an actual molded product In the presentation method,
A CAE executing step of reading the CAD data, receiving a plurality of condition settings, and generating three-dimensional shape data including point cloud data indicating a shape of a molded product based on the CAD data and the conditions,
A three-dimensional shape measuring step of acquiring three-dimensional shape data including point cloud data indicating the shape of an actual molded product molded by a mold created based on the CAD data;
Of the point cloud data of the three-dimensional shape data generated in the CAE executing step and the point cloud data of the three-dimensional shape data acquired in the three-dimensional shape measuring step, a distance between mutually corresponding points is calculated. A distance calculation step,
An accuracy presenting step of presenting the distance calculated in the distance calculating step to the user as the accuracy of the three-dimensional shape data generated in the CAE executing step ,
In the CAE execution step, three-dimensional shape data including coordinates of the points of a virtual molded product obtained by molding a flat resin sheet in which a large number of points are drawn at equal intervals is generated,
In the three-dimensional shape measuring step, three-dimensional shape data including coordinates of the points of the actual molded product obtained by molding the resin sheet with the mold is acquired,
The distance calculation step corresponds to each other based on the coordinates of the points of the three-dimensional shape data generated in the CAE execution step and the coordinates of the points of the three-dimensional shape data acquired in the three-dimensional shape measurement step. CAE accuracy presented wherein that you calculate the distance between the point of.