JP6749040B2 - 3D data conversion method - Google Patents

Description

The present invention relates to a method for suitably acquiring three-dimensional data of a vehicle member by reverse engineering.

Reverse engineering is not a method of manufacturing a product based on a design drawing, but is a method of acquiring CAD data and the like necessary for manufacturing from a product, and is a development method that goes through a process reverse to a normal manufacturing process.

For example, in Patent Document 1, as a technique related to reverse engineering, a surface profile measuring device, an internal profile measuring device, a nondestructive measuring device, a point cloud data conversion input synthesizing device, a three-dimensional CAD model conversion processing device, A three-dimensional shape measuring system including an analysis model creating device and an analysis result evaluation device is disclosed.

In this three-dimensional shape measuring system, a three-dimensional CAD model is obtained by converting a three-dimensional image acquired by a surface shape measuring device, an internal shape measuring device, and a nondestructive measuring device into point cloud data by a point cloud data conversion input combining device. The conversion processing device converts the point cloud data into polygon data, which is further converted into CAD data or the like. Further, in this three-dimensional shape measuring system, the CAD data is changed into a model for FEM structural analysis by the analysis model creating device, and the structural analysis by the analysis result evaluation device is executed on this model.

JP, 2010-66169, A

For example, when three-dimensional data of a vehicle member composed of a large number of components and assemblies, such as the body of an automobile, is converted into three-dimensional data and structural analysis is performed, high-accuracy analysis is possible only by acquiring three-dimensional data of the entire vehicle member. I can't do it. That is, in order to realize highly accurate structural analysis of a vehicle member, it is necessary to acquire detailed three-dimensional data for each component of the vehicle member.

However, if many component parts of a vehicle member are disassembled to obtain three-dimensional data and CAD data of the vehicle member is to be constructed based on this three-dimensional data, the mutual positional relationship between the component parts is unknown. Therefore, it is difficult for the conventional three-dimensional shape measuring system to obtain precise three-dimensional data of vehicle members.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a three-dimensional data conversion method capable of accurately acquiring three-dimensional data of a vehicle member including a large number of constituent parts. ..

The present invention is to solve the above problems, and in a method for converting a vehicle member including a plurality of constituent parts into three-dimensional data, the plurality of constituent parts are welded to each other. And a second component, and before disassembling the second component from the first component of the vehicle member, the vehicle member is scanned with the second component by a scanner to obtain image data thereof. A first step, and a second step of disassembling the second component from the first component of the vehicle member , scanning the disassembled second component with the scanner to obtain image data thereof, Based on the image data of the vehicle member acquired in the first step and the image data of the second component acquired in the second step, by CAD processing of the image processing device, CAD data of the vehicle member and A third step of acquiring CAD data of the second component, and an operator operating the image processing device to reflect the CAD data of the second component on the CAD data of the vehicle member, A fourth step of constructing CAD data of the vehicle member , wherein the second step penetrates the second component by cutting off a welded portion between the first component and the second component. after forming the hole, characterized that you get the image data of the second component including said through hole.

To obtain precise three-dimensional data of a vehicle member including a plurality of constituent parts, each constituent part is disassembled from the vehicle member, CAD data of each constituent part is acquired, and the obtained CAD of each constituent part is obtained. The data will be assembled to construct CAD data of vehicle members. In this case, when assembling the vehicle member on the CAD data, information relating to the mutual positional relationship of each component is required.

In the present invention, in the first step, before disassembling the component parts, the image data of the vehicle member including these component parts is acquired by the scanner. Then, in the third step, the CAD data of the vehicle member is acquired based on the image data of the vehicle member. As a result, the CAD data of the vehicle member acquired in the third step includes information indicating the mutual positional relationship of the constituent parts.

Therefore, in the fourth step, when the CAD data of the vehicle member is constructed by combining the CAD data of the component parts, while referring to the mutual positional relationship of the component parts in the previously acquired CAD data of the vehicle member, A vehicle in which the shape and mutual positional relationship of the components are accurately reflected by reflecting the information regarding the shape of the CAD data of each component acquired through the second and third steps in the CAD data of this vehicle member. Fine CAD data of a member can be acquired.

According to the present invention, it becomes possible to accurately acquire three-dimensional data of a vehicle member including a large number of constituent parts.

It is a perspective view showing an image processing system concerning the present invention. It is a functional block diagram of an image processing system. It is a perspective view which shows 1 process of the three-dimensional-data conversion method which concerns on this invention. It is a perspective view which shows 1 process of the three-dimensional-data conversion method which concerns on this invention. It is a conceptual diagram which shows 1 process of the three-dimensional-data conversion method which concerns on this invention. It is a conceptual diagram which shows the state which displayed the CAD data of a vehicle member on the display part.

Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of a three-dimensional data conversion method according to the present invention.

1 and 2 show an image processing system for acquiring three-dimensional data of a vehicle member including a plurality of constituent parts. The image processing system 1 includes a scanner 2 capable of capturing an image of the vehicle member W, and an image processing device 3 connected to the scanner 2.

The scanner 2 may be a non-contact type such as a laser scanner, a CCD camera, or a CT scanner, but is not limited to this, and a contact type having a contact may be used. As the scanner 2, various types such as a handy type that can be gripped and operated by an operator and a type that is automatically operated by a robot arm can be used. As a specific example of the scanner 2, META SCAN 3D (registered trademark), GO!, manufactured by Creaform, Inc. is used. Examples thereof include SCAN 3D (registered trademark) and PERCEPTRON (registered trademark) manufactured by Perceptron, Inc.

The image processing apparatus 3 includes an arithmetic processing unit 4 for executing a predetermined arithmetic operation, a storage unit 5 for storing various programs and data, an input unit 6 operated by an operator, and a display unit 7 for displaying predetermined information. , And a communication unit 8 that communicates with the scanner 2. The image processing device 3 includes, for example, a computer (for example, a PC) that mounts various hardware such as a CPU, a ROM, a RAM, a HDD, a monitor, an input interface, and a printer, but is not limited thereto. Further, each component can be connected to each other by a bus.

The arithmetic processing unit 4 is composed of, for example, a CPU, and executes various arithmetic processing necessary for three-dimensional data conversion and structural analysis of the vehicle member W based on programs and data stored in the storage unit 5. .. As shown in FIG. 2, the arithmetic processing unit 4 mainly includes a CAD model conversion unit 9, a CAD model processing unit 10, and a structure analysis unit 11.

The CAD model conversion means 9 converts the three-dimensional image data captured by the scanner 2 into CAD data. That is, the CAD model conversion means 9 generates CAD data by executing processing of point grouping, polygonization (STLing), and surfaceization based on the three-dimensional image data acquired by the scanner 2. ..

The CAD model processing unit 10 is configured to edit the CAD data generated by the CAD model conversion unit 9 based on the operation of the input unit 6 by the CAD operator.

The structural analysis means 11 changes this CAD data into a model (FEM model) that can use the finite element method, and executes the structural analysis. That is, the structural analysis means 11 divides the shape of the vehicle member W or its constituent parts A to C into minute elements having a three-dimensional shape (solid) and three-dimensionally models them, and uses the finite element method. The structural analysis of the vehicle member W is performed.

The storage unit 5 stores various programs (software) calculated by the calculation processing unit 4 and image data acquired by the scanner 2. The storage unit 5 includes a main storage device such as a RAM and an auxiliary storage device such as a ROM, a HDD, and a USB memory. The storage unit 5 stores programs such as a three-dimensional model conversion program, a CAD model processing program, and a structural analysis program.

The three-dimensional model conversion program is software that converts the image data acquired by the scanner 2 into CAD data. Specific examples of the three-dimensional model conversion program include Geometric Design (registered trademark) from 3D Systems, Inc. (3D Systems, Inc.).

The CAD model processing program is software for editing the CAD data converted by the CAD model conversion program. Specific examples of this CAD model processing program include SOLIDWORKS (registered trademark) of Solidworks Corporation.

The structural analysis program is software that changes the CAD data into an FEM model that can use the finite element method and executes the structural analysis by the finite element method. Specific examples of the structural analysis program include SOLIDWORKS (registered trademark, SOLIDWORKS Simulation) of Solidworks Corporation.

The input unit 6 is composed of various input interfaces such as a mouse, a keyboard and a track pad. The input unit 6 can edit various information such as scan data (image data) displayed on the display unit 7, CAD data, and a result of structural analysis by an operator's operation.

The display unit 7 includes a liquid crystal monitor and other various display devices. The display unit 7 can display the image data of the vehicle member W and its components A to C acquired by the scanner 2. The display unit 7 also displays the CAD data created by the CAD model conversion program and the CAD model processing program.

As shown in FIG. 2, the communication unit 8 is connected to the scanner 2 and is configured to receive a signal transmitted from the scanner 2, particularly image data.

Hereinafter, a method (three-dimensional data conversion method) for acquiring three-dimensional data of the vehicle member W using the image processing system 1 having the above-described configuration will be described.

The vehicle member W is configured as an assembly formed by assembling a plurality of component parts A to C, such as a vehicle body of an automobile. The vehicle body may be further disassembled into multiple assemblies. Specific examples of an assembly that constitutes a vehicle body of an automobile include a pillar, a side sill, a roof side rail, a side member, a dash cowl, and a floor.

Note that the “vehicle member” in the present embodiment includes not only the vehicle body of the automobile but also various assemblies constituting the vehicle body. In addition, the structure is not limited to this, and a vehicle body includes a structure including two or more components included in various assemblies. Further, the "components" in this embodiment include an assembly.

In the present embodiment, a vehicle member W composed of three component parts A to C is schematically shown. The vehicle member W is formed by assembling a large component A with small components B and C.

As shown in FIG. 1, the worker scans the vehicle member W with the scanner 2 before disassembling the respective component parts A to C, and three-dimensional image data (hereinafter referred to as “vehicle”) relating to the overall structure of the vehicle member W. (Referred to as "first image data of member"). The first image data of the vehicle member W captured by the scanner 2 is transmitted to the communication unit 8 of the image processing apparatus 3 and then stored in the storage unit 5.

Next, the worker separates the component B from the vehicle member W as shown in FIG. Here, the component B is assumed to be fixed to the component A by spot welding. In order to separate the component B from the component A, it is necessary to cut off the welded portion. Therefore, the operator cuts off a part of the component B with the cutting tool.

As a result, the connection between the component A and the component B is released, and the component B is removed from the component A. A part of the removed component B is cut away to form a through hole 12 (see FIG. 3).

After that, the component B is scanned by the scanner 2 and the image data thereof is stored in the storage unit 5 of the image processing apparatus 3. The scanner 2 also scans the vehicle member W after the component B is removed, and the image data (hereinafter referred to as “second image data of vehicle member”) is stored in the storage unit 5.

Next, the worker separates the component C from the component A as shown in FIG. In the present embodiment, the recess 13 is formed in a part of the component A, and the recess 13 is covered with the component C. The presence of the recess 13 becomes apparent when the component C is separated from the vehicle member W (component A). Therefore, the information of the recess 13 is not included in the first image data and the second image data of the vehicle member W acquired earlier.

When the component C is separated from the component A, they are individually scanned by the scanner 2 (see FIG. 4). The image data of the component A and the component C thus obtained is stored in the storage unit 5 of the image processing apparatus 3.

When all the component parts A to C are disassembled and the image data is individually acquired by the scanner 2, the image processing device 3 causes the arithmetic processing unit 4 to convert the image data into CAD data. That is, the CAD model conversion means 9 of the arithmetic processing unit 4 activates the CAD model conversion program of the storage unit 5, executes each processing of point grouping, polygonization, and surface processing based on each image data, and responds. To generate CAD data.

The CAD data includes CAD data corresponding to the first image data of the vehicle member W (hereinafter referred to as “first CAD data of the vehicle member”) W1, CAD data corresponding to the second image data of the vehicle member W (hereinafter referred to as “vehicle”). W2, which is referred to as "second CAD data of a member", and CAD data of individual components A to C.

After that, the CAD data of the vehicle member W is constructed by editing these CAD data. That is, the operator operates the input unit 6 and causes the CAD model processing means 10 of the arithmetic processing unit 4 to activate the CAD model processing program of the storage unit 5. Further, as shown in FIG. 5, the operator causes the display unit 7 to display the first CAD data W1 of the vehicle member W and the CAD data of each of the components A to C. The operator causes the display unit 7 to display the second CAD data W2 (not shown) of the vehicle member W as needed.

The operator operates the input unit 6 to edit each CAD data displayed on the display unit 7. For example, the CAD data of the component B separated from the vehicle member W includes the through hole 12 generated by removing the welded portion. The operator uses the editing function of the CAD model processing program to execute the editing processing for closing the through hole 12. However, for later structural analysis, it is desirable to reflect information (indicated by reference numeral 14 in FIG. 6) on the dimensions of the welded portion (the dimensions of the through holes 12) in the CAD data.

Then, the operator reflects the CAD data of the component B on the first CAD data W1 of the vehicle member W. As shown in FIG. 5, the first CAD data W1 of the vehicle member W includes data relating to the outer shape of each of the component parts A to C before being separated from the vehicle member W. The operator matches the CAD data of the single component B with the CAD data of the component B included in the first CAD data W1 of the vehicle member W.

At this time, these CAD data may not completely match. The reason is that, for example, when the component B is plastically deformed when the component B is separated from the vehicle member W, or when the component B is elastically deformed and assembled to the vehicle member W, the component B is separated from the vehicle member W. Sometimes, the elastic deformation is eliminated, and the component B is restored to its original shape. In any case, in order to reproduce the state of the vehicle member W before disassembling with CAD data, the operator should make a single unit so as to match the CAD data of the component B included in the first CAD data W1 of the vehicle member W. The CAD data of the component B is edited.

Through the editing process as described above, the component B is reflected in the first CAD data W1 of the vehicle member W. At this time, the partial CAD data of the component B, which was originally included in the first CAD data W1 of the vehicle member W, is deleted.

Similarly to the component B, the operator operates the input unit 6 to reflect the CAD data of the single component A in the first CAD data W1 of the vehicle member W. The CAD data for the single component A includes the recess 13, but the recess 13 is covered by the component C.

Therefore, when the operator reflects the CAD data relating to the single component A in the first CAD data W1 of the vehicle member W, the operator displays the concave portion 13 in the component C so that the concave portion 13 is covered and displayed. Edit the CAD data. When the editing is completed, the CAD data of the single component A is completely reflected in the first CAD data W1 of the vehicle member W. At this time, the partial CAD data of the component A included in the original first CAD data W1 is deleted.

Similarly to the components A and B, the operator reflects the CAD data of the component C on the first CAD data W1 of the vehicle member W. That is, by operating the input unit 6, the CAD data of the single component C is superimposed on the CAD data of the component C included in the first CAD data W1 of the vehicle member W. Then, the CAD data of the component C included in the original vehicle member W is deleted.

By the above, the CAD data of the vehicle member W in which the CAD data of all the component parts A to C are reflected is completed (see FIG. 6).

After that, the operator executes the structural analysis program of the storage unit 5 via the structural analysis unit 11 of the arithmetic processing unit 4, and creates the structural analysis data (FEM model) based on the CAD data of the vehicle member W. , Perform its structural analysis. This structural analysis can be utilized for various CAE evaluations such as collision, NV, and strength.

As described above, the three-dimensional data conversion method according to the present embodiment scans the vehicle member W together with the component parts A to C by the scanner 2 before disassembling the component parts A to C from the vehicle member W. Acquire one image data (first step). Further, after disassembling the constituent parts A to C from the vehicle member W, the disassembled constituent parts A to C are scanned by the scanner 2 to acquire image data thereof (second step).

Then, based on the first image data of the vehicle member W acquired in the first step and the image data of the components A to C acquired in the second step, the first processing of the vehicle member W is performed by the arithmetic processing of the image processing device 3. The CAD data W1 and the CAD data of the components A to C are acquired (third step). Further, the CAD data of the vehicle member W is constructed by reflecting the CAD data of the component parts A to C on the first CAD data W1 of the vehicle member W (fourth step).

In the present embodiment, in the first step, the scanner 2 acquires the first image data of the vehicle member W including these components A to C before disassembling the components A to C. Then, in the third step, the first CAD data W1 of the vehicle member W is acquired based on the first image data of the vehicle member W. As a result, the first CAD data W1 of the vehicle member W includes information indicating the mutual positional relationship of the components A to C.

In the fourth step, when the CAD data of the vehicle member W is constructed by combining the CAD data of the single component parts A to C, the component parts A to C in the first CAD data W1 of the vehicle member W acquired earlier are constructed. Refer to the mutual positional relationship of. Further, the first CAD data W1 of the vehicle member W is made to reflect the information related to the shape of the CAD data of each of the component parts A to C acquired through the second and third steps. As a result, it is possible to obtain fine CAD data of the vehicle member W in which the shapes of the component parts A to C and their mutual positional relationships are accurately reflected.

It should be noted that the present invention is not limited to the configurations of the above-described embodiments, and is not limited to the above-described operational effects. The present invention can be variously modified without departing from the scope of the present invention.

In the above embodiment, an example in which only the first CAD data W1 of the vehicle member W is used to construct fine CAD data of the vehicle member W has been shown, but the present invention is not limited to this. The actual vehicle member W has a complicated structure due to a large number of components and a large number of assemblies. Therefore, when a certain component is separated from the vehicle member W, a new component is often exposed.

Therefore, it is desirable to acquire the image data and the CAD data of the vehicle member W every time the component is separated from the vehicle member W. That is, in the present invention, a plurality of image data subsequent to the second image data and a plurality of CAD data subsequent to the second CAD data W2 are acquired for the vehicle member W to obtain fine CAD data of the vehicle member W. When constructing, it is desirable to display these on the display unit 7 for reference.

2 Scanner 3 Image Processing Device A Component Parts of Vehicle Member B Component Parts of Vehicle Member C Component Parts of Vehicle Member W Vehicle Member

Claims (1)

In a method of converting a vehicle member including a plurality of constituent parts into three-dimensional data,
The plurality of components includes a first component and a second component, which are welded to each other,
Before disassembling the second component from the first component of the vehicle member, a first step of scanning the vehicle member with the second component by a scanner to obtain image data thereof,
After disassembling the second component from the first component of the vehicle member , a second step of scanning the disassembled second component by the scanner to obtain image data thereof,
Based on the image data of the vehicle member acquired in the first step and the image data of the second component acquired in the second step, by CAD processing of the image processing device, CAD data of the vehicle member and A third step of obtaining CAD data of the second component,
When the operator operates the image processing apparatus, the CAD data of the vehicle member, to reflect the CAD data of the second component, and a fourth step of constructing the CAD data of the vehicle member ,
In the second step, after forming a through hole in the second component by cutting off a welded portion between the first component and the second component, of the second component including the through hole. three-dimensional data of wherein that you get the image data.

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