JP2014215769A - Drawing generation apparatus, drawing generation method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate drawing generation based on information of a three-dimensional component model.SOLUTION: A storage part 511 stores shape data of a first component model and shape data of a second component model included in a three-dimensional assembly model. An extraction part 512 extracts a contact position where the first component model and the second component model come into contact with each other based on the shape data of the first component model and the shape data of the second component model. A generation part 513 determines the dimension of the second component model based on the contact position, and generates drawing information of the second component model including the dimension. An output part 514 outputs the drawing information generated by the generation part 513.

Description

  The present invention relates to a drawing generation apparatus, a drawing generation method, and a program.

  In recent years, design by three-dimensional computer-aided design (CAD) has become widespread, and three-dimensional shape part models created by three-dimensional CAD are used in various product processes. For example, when creating a two-dimensional drawing of a part from a part model created by three-dimensional CAD, a method of linking the part model and the two-dimensional drawing is used.

  The part model created by 3D CAD includes dimension information indicating the shape of the part. When creating a 2D drawing or 3D drawing, the dimension information can be extracted and placed on the drawing. Is possible. For example, when creating a two-dimensional drawing, a projection drawing from an arbitrary direction of a three-dimensional part model is drawn as a two-dimensional drawing, and a dimension indicating the shape of the three-dimensional part model is automatically displayed on the two-dimensional drawing. Can be arranged.

  There is also known a three-dimensional model creation device that assembles a three-dimensional model by joining component models (see, for example, Patent Document 1). The three-dimensional model creation device creates a three-dimensional part model having joining reference data for joining to another part model, selects at least two part models, and places them in the work coordinate space. Then, the three-dimensional model creation device assembles the three-dimensional models by joining the component models based on the joining reference points specified by the joining reference data.

  There is also known a work support information automatic derivation system that automatically derives information for supporting a series of operations necessary for actually completing an actual product from finished product data created with three-dimensional data (for example, (See Patent Document 2). In this work support information automatic derivation system, there is interference between the moving parts and the fixed parts by moving the moving parts in each axial direction among the fixed parts and moving parts that constitute the completed product on the three-dimensional data. The movement distance of the moving part with respect to the fixed part calculated in this case is acquired. As a result, a positional relationship matrix is derived in which the movement distance and the presence or absence of interference are indicated by an array of numerical values in each axial direction for each combination of the fixed part and the moving part.

JP 2004-240990 A JP 2006-277462 A

  The method for creating a two-dimensional drawing or a three-dimensional drawing of a part from a part model created by a conventional three-dimensional CAD has the following problems.

  The dimension in the process of creating the shape of the three-dimensional part model is a dimension only for creating a three-dimensional shape, and may not be a dimension arrangement from a dimension reference position in consideration of manufacturability. In addition, when creating a part model, shapes that are unnecessary for drawing creation may be included. For this reason, it is not appropriate to reflect the shape and dimensions of the three-dimensional CAD part model in the drawing as they are.

  Therefore, after projecting the shape of the three-dimensional part model onto the two-dimensional drawing, the operator manually takes the necessary size for the shape on the two-dimensional drawing with the shape necessary for processing as the reference position in consideration of manufacturability. Created in.

  For example, in the process of creating the three-dimensional part model shown in FIG. 1, dimensions as shown in FIG. 2 may be set. In the part model of FIG. 2, reference positions P201 to P203 that do not exist in actual parts are provided in the space, and dimensions from the reference positions P201 to P203 are arranged.

  When the shape of the part model of FIG. 2 is projected onto a two-dimensional drawing to create a top side projection, a two-dimensional drawing as shown in FIG. 3 is created. In the two-dimensional drawing of FIG. 3, the dimensions from each surface of the component model and the dimensions from the reference position P201 to the reference position P203 in FIG. 2 are mixed, and the dimension reference is not unified. Furthermore, the dimensions from the reference position P201 to the reference position P203 in FIG. 2 are often dimensions that are not necessary for processing the part.

  Therefore, as shown in FIG. 4, the operator changes the dimension reference position in the two-dimensional drawing of FIG. 3 to an appropriate surface of the component model, and manually creates a dimension from the surface. Thereby, the two-dimensional drawing is corrected.

  Similarly, when creating a three-dimensional drawing, an operator manually creates a dimension by re-taking the dimension from a reference position necessary for processing on a three-dimensional part model.

  As described above, although various efficiencies are achieved by the three-dimensional CAD, the man-hours for creating the part drawing from the part model created by the three-dimensional CAD have not been sufficiently reduced.

  In one aspect, an object of the present invention is to improve the efficiency of drawing creation based on information of a three-dimensional part model.

In one plan, the drawing generation apparatus includes a storage unit, an extraction unit, a generation unit, and an output unit.
The storage unit stores shape data of the first part model and shape data of the second part model included in the three-dimensional assembly model. The extraction unit extracts a contact position where the first part model and the second part model are in contact based on the shape data of the first part model and the shape data of the second part model. The generation unit obtains the dimension of the second part model based on the contact position, and generates drawing information of the second part model including the dimension. The output unit outputs drawing information.

  According to the drawing generation apparatus of the embodiment, the drawing creation based on the information of the three-dimensional part model can be made efficient.

It is a figure which shows a three-dimensional component model. It is a figure which shows the three-dimensional component model by which the dimension was set. It is a figure which shows a two-dimensional drawing. It is a figure which shows the corrected two-dimensional drawing. It is a functional block diagram of drawing production | generation apparatus. It is a flowchart of drawing production | generation processing. It is a figure which shows the specific example of drawing production | generation apparatus. It is a flowchart of a reference plane extraction process. It is a flowchart which shows the 1st example of a process in case there is no structure information. It is a flowchart which shows the 2nd example of a process in case there is no structure information. It is a flowchart of a two-dimensional drawing generation process. It is a flowchart of the dimension arrangement | positioning process in a two-dimensional drawing production | generation process. It is a flowchart of a three-dimensional drawing generation process. It is a flowchart of the dimension arrangement | positioning process in a three-dimensional drawing production | generation process. It is a figure which shows an assembly model. It is a figure which shows structure information. It is a figure which shows the contact surface in 3 directions. It is a figure which shows the volume of a component model. It is a figure which shows the 2nd component model which is contacting the component model of the largest volume. It is a figure which shows the 3rd component model which is contacting the 2nd component model. It is a figure which shows the structure information produced | generated by the model information extraction part. It is a figure which shows the contact area of a contact surface. It is a figure (the 1) which shows the assembly model containing a cylindrical part model. It is a figure (the 2) which shows the assembly model containing a cylindrical part model. It is a figure which shows the location which is contacting the cylindrical part model. It is a figure which shows the assembly model containing the component model which has two holes. It is a figure which shows the component model which has two holes. It is a figure which shows the reference plane based on the position of two holes. It is a figure which shows the assembly model containing the component model which has four holes. It is a figure which shows the component model which has four holes. It is a figure which shows the reference plane based on the position of four holes. It is a figure which shows the component model of the process target in a two-dimensional drawing production | generation process. It is a figure which shows the two-dimensional drawing containing the dimension from the position of a reference plane. It is a figure which shows the two-dimensional drawing containing the dimension from positions other than a reference plane. It is a figure which shows the two-dimensional drawing after a dimension change. It is a figure which shows the highlight display of the reference plane in an assembly model. It is a figure which shows the highlight display of the reference plane in a component model. It is a figure which shows the tag of a reference plane. It is a figure which shows the highlight display of the reference plane at the time of assembly model creation. It is a figure which shows the component model of the process target in a three-dimensional drawing production | generation process. It is a figure which shows the three-dimensional drawing containing the dimension from the position of a reference plane. It is a figure which shows the three-dimensional drawing containing the dimension from positions other than a reference plane. It is a block diagram of information processing apparatus.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 5 illustrates a functional configuration example of the drawing generation apparatus according to the embodiment. The drawing generation device 501 of FIG. 5 includes a storage unit 511, an extraction unit 512, a generation unit 513, and an output unit 514.

  The storage unit 511 stores the shape data of the first part model and the shape data of the second part model included in the three-dimensional assembly model. The extraction unit 512 and the generation unit 513 are functional units that execute processing according to the embodiment using the shape data stored in the storage unit 511.

  FIG. 6 is a flowchart illustrating an example of a drawing generation process performed by the drawing generation apparatus 501 of FIG. First, the extraction unit 512 refers to the storage unit 511 and makes contact between the first component model and the second component model based on the shape data of the first component model and the shape data of the second component model. The contact position is extracted (step 601).

  Next, the generation unit 513 obtains the dimension of the second part model based on the contact position (step 602), and generates drawing information of the second part model including the dimension (step 603). Then, the output unit 514 outputs the drawing information generated by the generation unit 513.

  According to such a drawing generation apparatus 501, it is possible to improve the efficiency of drawing creation based on information of a three-dimensional part model.

  FIG. 7 shows a specific example of the drawing generation apparatus 501 of FIG. The extraction unit 512 in FIG. 7 includes a model information extraction unit 701 and a reference plane extraction unit 702, and the generation unit 513 includes a direction determination unit 711 and a dimension arrangement unit 712.

  The storage unit 511 in FIG. 7 stores information on a three-dimensional assembly model created by three-dimensional CAD. The information of the three-dimensional assembly model includes shape data of a plurality of part models included in the three-dimensional assembly model. The shape data of each part model includes, for example, information such as the positions of a plurality of vertices that define the shape of each part model and the size of the edge between the vertices.

  The information of the three-dimensional assembly model may further include configuration information included in the three-dimensional assembly model. The three-dimensional assembly model is a model that represents a state in which a plurality of part models are assembled, and the configuration information is information that indicates the assembly order of the plurality of part models in that state. The configuration information may be generated by three-dimensional CAD, or may be generated by the model information extraction unit 701.

  When creating a drawing of a part model included in a 3D assembly model, there are surfaces, edges, etc. that serve as reference positions according to the processing conditions and assembly conditions of the parts, and the drawing is created based on this reference position. Often.

  On the other hand, when creating a three-dimensional assembly model, an assembly state three-dimensional assembly model is created in which two component models are brought into contact with each other based on the reference position. Therefore, when there is a contact position that is in contact between two part models included in the three-dimensional assembly model, the contact position can be used as a reference position when creating a drawing of those parts.

  The model information extraction unit 701 of the extraction unit 512 refers to the information of the three-dimensional assembly model stored in the storage unit 511 and extracts various information used for the drawing generation process. The reference surface extraction unit 702 extracts a plane (contact surface) including a contact position where the two component models are in contact based on the various pieces of extracted information, and determines the contact surface as a reference surface. This reference plane is used as a reference position for the dimensions of each component model.

  The direction determination unit 711 of the generation unit 513 determines the front direction and the side direction of the part model depending on whether the drawing to be generated is a two-dimensional drawing or a three-dimensional drawing. The dimension arranging unit 712 arranges dimensions from the reference plane on the generation target drawing based on the determined front direction and side direction.

  The output unit 514 is, for example, a display device, a printer, or a network connection device. When the output unit 514 is a display device, the output unit 514 displays the generated drawing on the screen, and when the output unit 514 is a printer, the output unit 514 prints the generated drawing on a paper medium. Output.

  When the output unit 514 is a network connection device, the output unit 514 outputs the generated drawing to a communication network, and the drawing is transmitted to an information processing device (computer) connected to the communication network. The information processing apparatus can display or print the received drawing via a display device or a printer.

  Next, the drawing generation process performed by the drawing generation apparatus 501 in FIG. 7 will be described in detail with reference to FIGS.

  FIG. 8 is a flowchart illustrating an example of the reference plane extraction process performed by the extraction unit 512. First, the model information extraction unit 701 refers to the information of the three-dimensional assembly model stored in the storage unit 511 (step 801) and checks whether or not configuration information is included (step 802). When configuration information is included in the three-dimensional assembly model (step 802, YES), the model information extraction unit 701 acquires a parent-child relationship between component models from the configuration information (step 803).

For example, the assembly model shown in FIG. 15 includes the following five part models.
MODEL_A
MODEL_B
MODEL_C
MODEL_D
MODEL_E

  In the assembly model of FIG. 15, MODEL_B is assembled on MODEL_A, and MODEL_C is assembled on MODEL_B. Similarly, MODEL_D is assembled on MODEL_A, and MODEL_E is assembled on MODEL_D.

The configuration information indicating the assembly order is as shown in FIG. The following parent-child relationship between component models is acquired from the configuration information of FIG.
Child of MODEL_A: MODEL_B, MODEL_D
Child of MODEL_B: MODEL_C
Child of MODEL_D: MODEL_E
The parent of MODEL_C: MODEL_B
The parent of MODEL_E: MODEL_D
The parent of MODEL_B: MODEL_A
The parent of MODEL_C: MODEL_A

  A parent-child relationship between part models represents a hierarchical relationship between part models, where the parent part model is a higher-order part model than its child part model, and the child part model is a lower-order part than its parent part model. It is a model. In the case of the assembly model shown in FIG. 15, the uppermost part model is MODEL_A, and the lower part part models of MODEL_A are MODEL_B and MODEL_D. The lower part model of MODEL_B is MODEL_C, and the lower part model of MODEL_D is MODEL_E.

  Next, the reference plane extraction unit 702 selects a part model to be processed in order from the top-level part model based on the parent-child relationship between the part models, and the part model between the part model to be processed and another part model is selected. A contact surface is extracted (step 804). At this time, the reference plane extraction unit 702 extracts the shape data of each component model from the information of the three-dimensional assembly model stored in the storage unit 511, and based on the vertex positions indicated by the shape data of the two component models. Extract the contact surface between these part models.

  Next, the reference surface extraction unit 702 checks whether or not a plurality of contact surfaces in the same direction have been extracted from the component model to be processed (step 805). When a plurality of contact surfaces in the same direction are extracted (step 805, YES), the reference surface extraction unit 702 selects a contact surface whose component model of the contact partner is a higher-order component model (step 809) and selects The contact surface thus determined is determined as a reference surface in that direction (step 806). Thereby, the contact surface in contact with the component model corresponding to the parent of the component model to be processed can be determined as the reference surface.

  On the other hand, when only one contact surface in the same direction is extracted (step 805, NO), the reference surface extraction unit 702 determines that contact surface as a reference surface (step 806).

  Here, as shown in FIG. 17, a case in which contact surfaces in three directions (X direction, Y direction, Z direction) orthogonal to each other are extracted using MODEL_A, MODEL_B, and MODEL_C in FIG. 15 as processing target component models. explain.

  First, when the part model to be processed is MODEL_A, the X surface, Y surface, and Z surface of MODEL_A are extracted as contact surfaces in the X direction, the Y direction, and the Z direction, respectively. The X surface, Y surface, and Z surface are in contact with MODEL_B, which is a lower part model. In this case, since only one contact surface in each direction is extracted, the X surface, the Y surface, and the Z surface are determined as reference surfaces in the X direction, the Y direction, and the Z direction, respectively.

  Next, when the part model to be processed is MODEL_B, the X surface and X back surface of MODEL_B are extracted as contact surfaces in the X direction, and the Y surface and Y back surface of MODEL_B are extracted as contact surfaces in the Y direction. . Further, the Z front surface and the Z back surface of MODEL_B are extracted as contact surfaces in the Z direction. The X surface, the Y surface, and the Z surface are in contact with MODEL_C, which is a lower component model, and the X back surface, the Y back surface, and the Z back surface are in contact with MODEL_A, which is an upper component model.

  In this case, since a plurality of contact surfaces in each direction are extracted, one of the plurality of contact surfaces is determined as a reference surface. In the X direction, the X back surface in contact with the higher-order component model (MODEL_A) among the X front surface and the X back surface is determined as the reference surface. Similarly, the Y back surface is determined as the reference surface in the Y direction, and the Z back surface is determined as the reference surface in the Z direction.

  Next, when the component model to be processed is MODEL_C, the X back surface, the Y back surface, and the Z back surface of MODEL_C are extracted as contact surfaces in the X direction, the Y direction, and the Z direction, respectively. The X back surface, the Y back surface, and the Z back surface are in contact with MODEL_B, which is a higher-level component model. In this case, since only one contact surface in each direction is extracted, the X back surface, the Y back surface, and the Z back surface are determined as reference surfaces in the X direction, the Y direction, and the Z direction, respectively.

  After determining the reference plane in each direction, the reference plane extraction unit 702 checks whether there is a lower part model of the part model to be processed (step 807). When there is a lower part model (step 807, YES), the reference plane extraction unit 702 repeats the processes in and after step 804 using the lower part model as the part model to be processed. Then, when there is no lower part model (step 807, NO), the reference plane extraction unit 702 ends the process.

  When the configuration information is not included in the three-dimensional assembly model (step 802, NO), the extraction unit 512 performs processing when there is no configuration information (step 808).

  FIG. 9 is a flowchart showing a first example of the process in step 808 of FIG. In the first example, configuration information is generated from shape data of each part model included in the three-dimensional assembly model, and a reference plane is determined based on the generated configuration information.

  First, the model information extraction unit 701 calculates the volume of each part model included in the three-dimensional assembly model, and extracts the part model having the maximum volume (step 901). At this time, the model information extraction unit 701 can calculate the volume of each component model based on the vertex position and the edge size indicated by the shape data of each component model.

  Next, the model information extraction unit 701 extracts another part model that is in contact with the part model having the maximum volume (step 902). The model information extraction unit 701 generates configuration information in which the assembly order is set in the order of extraction from the part model having the maximum volume by repeating the process of extracting the part model that is further in contact with the extracted part model (step 903). .

  For example, when the volume of each part model in FIG. 15 is calculated as shown in FIG. 18, MODEL_A that is the part model with the largest volume is extracted as the part model in the first assembly order. Next, as shown in FIG. 19, MODEL_B and MODEL_D that are in contact with MODEL_A are extracted as part models in the second assembly order.

  Then, as shown in FIG. 20, MODEL_C in contact with MODEL_B and MODEL_E in contact with MODEL_D are extracted as part models in the third assembly order. In this way, configuration information as shown in FIG. 21 is generated.

  The processing from step 904 to step 909 is the same as the processing from step 803 to step 807 and step 809 in FIG.

  FIG. 10 is a flowchart showing a second example of the process in step 808 of FIG. In the second example, the reference plane is determined without generating configuration information.

  First, the model information extraction unit 701 selects a part model to be processed from a plurality of part models included in the three-dimensional assembly model, and extracts an adjacent part model adjacent to the part model to be processed (step 1001). At this time, the model information extraction unit 701 can extract the adjacent part model based on the position of the vertex indicated by the shape data of each part model.

  Next, the reference surface extraction unit 702 extracts contact surfaces between the component model to be processed and the adjacent component model, and checks whether a plurality of contact surfaces in the same direction have been extracted (step 1002). When a plurality of contact surfaces in the same direction are extracted (step 1002, YES), the reference surface extraction unit 702 calculates the area (contact area) of the contact portion of each contact surface (step 1003). Then, the reference surface extraction unit 702 extracts the contact surface having the maximum contact area (step 1004) and determines the reference surface in that direction (step 1005). Thereby, one of a plurality of contact surfaces with a plurality of adjacent part models can be determined as a reference surface.

  On the other hand, when only one contact surface in the same direction has been extracted (step 1002, NO), the reference surface extraction unit 702 determines that contact surface as a reference surface (step 1005).

  For example, as shown in FIG. 22, when the part model to be processed is MODEL_B, the X surface and the X back surface of MODEL_B are extracted as the contact surfaces in the X direction, and the Y surface of MODEL_B and the contact surfaces in the Y direction are extracted. The Y back surface is extracted. Further, the Z front surface and the Z back surface of MODEL_B are extracted as contact surfaces in the Z direction. The X surface, the Y surface, and the Z surface are in contact with MODEL_C that is an adjacent component model, and the X back surface, the Y back surface, and the Z back surface are in contact with MODEL_A that is an adjacent component model.

  In this case, since a plurality of contact surfaces in each direction are extracted, one of the plurality of contact surfaces is determined as a reference surface. In the X direction, the X back surface having a larger contact area is determined as the reference surface among the X surface having a contact area of 20 and the X back surface having a contact area of 45. Similarly, the Y back surface is determined as the reference surface in the Y direction, and the Z back surface is determined as the reference surface in the Z direction.

  After determining the reference plane in each direction, the reference plane extraction unit 702 checks whether there are other unprocessed part models (step 1006). When there is another part model (step 1006, YES), the reference plane extraction unit 702 repeats the processing from step 1001 onward using another part model as a part model to be processed. If there is no other part model (step 1006, NO), the reference plane extraction unit 702 ends the process.

  By the way, as shown in the following (1) to (3), in step 804 in FIG. 8, step 905 in FIG. 9, or step 1002 in FIG. 10, any direction of the X direction, the Y direction, or the Z direction. In some cases, the contact surface may not exist. Even in such a case, the reference plane extraction unit 702 can determine the reference plane by a method as shown in the following (1) to (3), for example.

(1) A case where a contact surface between a part model to be processed and another part model exists in only one direction, and there is a place in contact with an arc, an edge, or a vertex in the other direction. The assembly model shown in FIG. 25 includes MODEL_M, MODEL_K, and three cylindrical MODEL_Ls. The back surface of MODEL_K, which is a part model to be processed, is in contact with MODEL_M, the side surface of MODEL_K is in contact with one MODEL_L, and the bottom surface of MODEL_K is in contact with two MODEL_L. In this case, since the contact surface (the back surface of MODEL_K) exists between MODEL_K and MODEL_M, the back surface of MODEL_K is determined as the reference surface.

  However, no contact surface exists between MODEL_K and the three MODEL_L. Therefore, instead of the contact surface, the side surface of MODEL_K that is in contact with the arc portion of one MODEL_L is extracted and determined as a reference surface. Similarly, the bottom surface of MODEL_K that is in contact with the arc portions of the two MODEL_L is extracted and determined as a reference surface.

  Instead of the portion that is in contact with the arc portion of another component model, the portion that is in contact with the edge or vertex of the other component model may be determined as the reference plane.

(2) There is only one contact surface between the part model to be processed and another part model, and there is a gap between the part model to be processed and the two part models in the other direction. When the assembly model shown in FIG. 26 includes MODEL_G, MODEL_F, and two cylindrical MODEL_Hs, the back surface of MODEL_F, which is a part model to be processed, is in contact with MODEL_G. As shown in FIG. 27, MODEL_F has two circular holes, and the assembly model is assembled with a gap between each hole and MODEL_H. In this case, since the contact surface (the back surface of MODEL_F) exists between MODEL_F and MODEL_G, the back surface of MODEL_F is determined as the reference surface.

  However, there is no contact surface in the other direction of MODEL_F. Therefore, instead of the contact surface, a place where a gap exists between MODEL_F and another part model is extracted. In this example, a gap exists between MODEL_F and two MODEL_H, and MODEL_F and each MODEL_H face each other through the gap.

  When assembling, it is possible to change the relative position of MODEL_F and MODEL_H by the amount of the gap. Therefore, it is not preferable to use the surface of MODEL_F facing the gap or the surface of MODEL_H as the reference plane. . Therefore, as shown in FIG. 28, the center position 2801 and the center position 2802 of the two holes of MODEL_F are extracted as reference positions.

  Then, planes S1 and S2 are extracted as two planes that are perpendicular to the back surface of MODEL_F and have a relatively large area, and a plane 2811 that passes through the center position 2801 and the center position 2802 and is parallel to the plane S1 is determined as the reference plane. The Furthermore, a plane 2812 that passes through an intermediate position 2803 between the center position 2801 and the center position 2802 and is parallel to the plane S2 is determined as another reference plane.

  In this manner, the back surface of MODEL_F can be determined as the reference position of the vertical dimension, and the reference position of the horizontal dimension can be determined based on the positions of the two holes of MODEL_F.

(3) There is only one contact surface between the part model to be processed and another part model, and there is a gap between the part model to be processed and the four part models in the other direction. 29. The assembly model shown in FIG. 29 includes MODEL_I, MODEL_J, and four MODEL_Ns having a cylindrical shape, and the back surface of MODEL_J that is a part model to be processed is in contact with MODEL_I. As shown in FIG. 30, MODEL_J has four circular holes, and the assembly model is assembled with a gap between each hole and MODEL_N. In this case, since the contact surface (the back surface of MODEL_J) exists between MODEL_J and MODEL_I, the back surface of MODEL_J is determined as the reference surface.

  However, there is no contact surface in the other direction of MODEL_J. Therefore, instead of the contact surface, a portion where a gap exists between MODEL_J and another part model is extracted. In this example, a gap exists between MODEL_J and the four MODEL_N, and MODEL_J and each MODEL_N face each other through the gap.

  When assembling, it is possible to change the relative position of MODEL_J and MODEL_N by the gap, so it is not preferable to use the surface of MODEL_J facing the gap or the surface of MODEL_N as the reference plane. . Therefore, as shown in FIG. 31, the center position 3101, the center position 3102, the center position 3103, and the center position 3104 of the four holes of MODEL_J are extracted.

  Next, a plane S3 and a plane S4 are extracted as two planes that are perpendicular to the back surface of MODEL_J and have a relatively large area. A plane 3111 that passes through an intermediate position between the center position 3101 and the center position 3102 and passes through an intermediate position between the center position 3103 and the center position 3104 and parallel to the plane S3 is determined as a reference plane. Further, a plane 3112 that passes through an intermediate position between the center position 3101 and the center position 3103 and passes through an intermediate position between the center position 3102 and the center position 3104 and parallel to the plane S4 is determined as another reference plane.

  In this way, the back surface of MODEL_J can be determined as the reference position for the vertical dimension, and the reference position for the horizontal dimension can be determined based on the positions of the four holes of MODEL_J.

  FIG. 11 is a flowchart illustrating an example of a two-dimensional drawing generation process performed by the generation unit 513. First, the direction determining unit 711 calculates the area or outer size of the reference surface in each direction of the part model to be processed (step 1101). At this time, the direction determining unit 711 can calculate the area or the outer size of each reference plane based on the vertex position and the edge size indicated by the shape data of the component model to be processed.

  Next, the direction determining unit 711 determines, in the front direction, a reference surface having a relatively large area or outer size among reference surfaces in a plurality of directions (step 1102). As the reference surface having a relatively large area or outer size, for example, a reference surface having the largest area or outer size is extracted.

  Next, the dimension arrangement unit 712 projects the determined reference plane in the front direction onto the front view of the two-dimensional drawing (step 1103), and arranges a side view and a top view based on the front view (step 1104). Then, the dimension placement unit 712 obtains the dimensions of each shape included in the component model to be processed using the position of each reference plane on the front view, the side view, and the top view as a reference position. Then, the dimensions are arranged (step 1105). Note that generation of either one or both of the side view and the top view can be omitted.

  For example, when MODEL_B in FIG. 15 is a part model to be processed, a reference plane A, a reference plane B, and a reference plane C in three directions are extracted as shown in FIG. Is determined in the front direction. In this case, for example, as shown in FIG. 33, a front view in which the reference plane B is projected and a side view in which the reference plane A is projected are generated.

  Since the reference plane A and the reference plane C are displayed as line segments on the front view, the edge 3301 included in the reference plane A and the edge 3302 included in the reference plane C are set as the reference positions for the dimensions. Further, the dimension arranging unit 712 can generate symbols indicating these reference positions. Symbols 3311 and 3312 indicate the position of the reference plane A and the position of the reference plane C, respectively.

  Similarly, on the side view, since the reference plane B is displayed as a line segment, the edge 3303 included in the reference plane B is set as a reference position for dimensions, and a symbol 3313 indicating the position of the reference plane B is generated. .

  When arranging dimensions on the front view and side view, it is desirable to devise so that the dimension lines do not overlap for reasons of appearance. Therefore, the dimension arranging unit 712 extracts shape elements such as edges, surfaces, and vertices in the order from the position of each reference surface, and generates dimensions from the position of each reference surface to the shape element in the extracted order.

  By the way, in step 1105 in FIG. 11, after the dimension from the predetermined position designated by the assembly model is arranged, the arranged dimension can be changed to the dimension from the position of the reference plane.

  FIG. 12 is a flowchart showing an example of such dimension arrangement processing. First, the dimension arrangement unit 712 extracts a reference plane in each direction (step 1201), and sets the position of each reference plane on the front view, the side view, and the top view (step 1202). Then, the dimension arranging unit 712 generates a dimension from a predetermined position on the front view, the side view, and the top view, and arranges the dimension together with the dimension extension line and the dimension line (step 1203). At this time, the output unit 514 can display a front view, a side view, and a top view including the generated dimensions on the screen.

  Next, the dimension arranging unit 712 checks whether or not the end position of each dimension auxiliary line matches the position of the reference plane (step 1204). If the end position of the extension line and the position of the reference plane match, it is determined that the dimension from the reference plane is placed. If they do not match, the dimension from the reference plane is not placed. To be judged. The dimension arrangement unit 712 may compare the end position of the dimension line with the position of the reference plane instead of the end position of the dimension extension line.

  When there is a dimension extension line that does not match the position of the reference plane (step 1204, NO), the dimension placement unit 712 emphasizes the corresponding dimension extension line, dimension line, and dimension on the front view, the side view, or the top view. The output unit 514 is instructed to display (step 1205). At this time, the dimension arranging unit 712 can highlight the display by changing the display color, the display brightness, and the like so that the dimension auxiliary line, the dimension line, and the dimension can be visually distinguished from other dimensions.

  The operator confirms the arrangement of the highlighted dimension, and inputs a correction instruction when it is determined that the dimension needs to be corrected. The dimension placement unit 712 corrects the dimension extension line, the dimension line, and the dimension in accordance with the input correction instruction (step 1206), and repeats the processes after step 1204. Then, when the end points of all the dimension extension lines coincide with the positions of the reference planes (step 1204, YES), the dimension arranging unit 712 ends the process.

  For example, as shown in FIG. 34, when the dimension 3401, the dimension 3402, and the dimension 3403 from a position other than the reference plane are highlighted, the operator issues a correction instruction to change those dimensions to the dimension from the reference plane. input. Thereby, as shown in FIG. 35, the dimension 3401, the dimension 3402, and the dimension 3403 are changed to the dimension 3501, the dimension 3502, and the dimension 3503 from the reference plane.

  Furthermore, it is also possible to highlight an assembly model or a part model using information on the reference plane. In this case, the generation unit 513 extracts a shape element corresponding to the reference surface from among the shape elements of the part model, and outputs other elements such as a predetermined display color, enhancement of the entire reference surface, enhancement of the contour line, and the like. Set display conditions to distinguish shape elements and other component models.

  For example, in the assembly model highlight display of FIG. 36, the reference planes in the three directions of MODEL_B are displayed in a display color different from that of MODEL_A. Here, the reference surfaces in the three directions of MODEL_B are the X back surface, the Y back surface, and the Z back surface in contact with MODEL_A. Also in the highlighted display of MODEL_B in FIG. 37, the reference planes in the three directions of MODEL_B are displayed in a predetermined display color, as in FIG.

  Furthermore, as shown in FIG. 38, when the operator designates a screen position corresponding to the reference plane using a pointing device or the like, the dimension arranging unit 712 can display a tag 3801 indicating the reference plane on the component model. The tag 3801 includes “Delete” and “Set” options. When the operator selects “Delete”, the reference plane information is deleted from the attribute information of the part model, and when “Set” is selected, the part Reference plane information is set in the model attribute information.

  By setting the reference plane information in the attribute information of the part model, the reference plane can be highlighted when another assembly model is created using the part model. For example, as shown in FIG. 39, when the MODEL_B is assembled on the MODEL_Q to create another assembly model, the reference surface of the MODEL_B is highlighted. As a result, the reference plane can be used as a guide, and the number of man-hours for creating the assembly model can be reduced.

  FIG. 13 is a flowchart illustrating an example of a three-dimensional drawing generation process performed by the generation unit 513. The processing in step 1301 and step 1302 in FIG. 13 is the same as the processing in step 1101 and step 1102 in FIG.

  The direction determining unit 711 calculates the area or outer size of the reference surface in each direction, determines a surface parallel to the reference surface having a relatively large area or outer size in the front direction, and is parallel to other reference surfaces. The surface is determined in the side direction (step 1303). As the reference surface having a relatively large area or outer size, for example, a reference surface having the largest area or outer size is extracted.

  Next, the dimension arrangement unit 712 generates a three-dimensional drawing of the part model to be processed based on the determined front direction and side direction (step 1304). Then, the dimension arranging unit 712 obtains the dimensions of each shape included in the component model to be processed using the position of each reference plane on the three-dimensional drawing as a reference position, and arranges the dimensions together with the dimension extension lines and the dimension lines.

  For example, when MODEL_B in FIG. 15 is a part model to be processed, as shown in FIG. 40, a reference plane AA, a reference plane BB, and a reference plane CC in three directions are extracted, and the reference plane BB having the maximum area is extracted. Is determined in the front direction. In this case, for example, a three-dimensional drawing as shown in FIG. 41 is generated.

  The dimension arranging unit 712 can also generate a symbol indicating the position of each reference plane on the three-dimensional drawing. Symbol 4101, symbol 4102, and symbol 4103 indicate the positions of the reference plane AA, the reference plane BB, and the reference plane CC, respectively.

  When arranging dimensions on a three-dimensional drawing, it is desirable to devise so that dimension lines do not overlap for reasons of appearance. Therefore, the dimension arranging unit 712 extracts shape elements such as edges, surfaces, and vertices in the order from the position of each reference surface, and generates dimensions from the position of each reference surface to the shape element in the extracted order.

  Incidentally, in step 1304 in FIG. 13, after the dimension from the predetermined position specified by the assembly model is arranged, the arranged dimension can be changed to the dimension from the position of the reference plane.

  FIG. 14 is a flowchart showing an example of such dimension arrangement processing. The processing in steps 1401 to 1406 in FIG. 14 is the same as the processing in steps 1201 to 1206 in FIG. 12 except that the generated drawing is a three-dimensional drawing.

  For example, as shown in FIG. 42, when the dimension 4201 from a position other than the reference plane is highlighted, the operator inputs a correction instruction to change the dimension 4201 to the dimension from the reference plane BB. Thereby, the dimension 4201 is changed to the dimension from the reference plane BB.

  According to the drawing generation processing of FIGS. 8 to 14, it is possible to improve the efficiency of creating a two-dimensional drawing and a three-dimensional drawing of a part model included in the three-dimensional assembly model. Further, when the arrangement of the part model in the assembly model is changed, the dimensions of the two-dimensional drawing and the three-dimensional drawing can be changed following the change, so that the man-hour for the drawing changing work is reduced.

  The flowcharts of FIGS. 8 to 14 are merely examples, and some processes may be omitted or changed according to the configuration and conditions of the drawing generation apparatus. For example, when the configuration information is always included in the three-dimensional assembly model, the processing in steps 802 and 808 in FIG. 8 can be omitted.

  Further, in step 804 in FIG. 8, step 905 in FIG. 9, or step 1002 in FIG. 10, instead of the contact surface between the part model to be processed and another part model, the part model to be processed and other parts You may extract the contact position between parts models. In this case, in step 806, step 907, or step 1005, the extracted contact position is determined as the reference position of the dimension, and in step 1105 of FIG. 11 and step 1304 of FIG. 13, the dimension from the reference position is generated. .

  The drawing generation apparatus 501 in FIGS. 5 and 7 can be realized by using an information processing apparatus as shown in FIG. 43, for example.

  43 includes a central processing unit (CPU) 4301, a memory 4302, an input device 4303, an output device 4304, an auxiliary storage device 4305, a medium driving device 4306, and a network connection device 4307. These components are connected to each other by a bus 4308.

  The memory 4302 is a semiconductor memory such as a read only memory (ROM), a random access memory (RAM), or a flash memory, and stores programs and data used for processing. The memory 4302 can be used as the storage unit 511.

  The CPU 4301 (processor), for example, operates as the extraction unit 512 and the generation unit 513 in FIGS. 5 and 7 by executing a program using the memory 4302, and performs drawing generation processing. At this time, the CPU 4301 also operates as the model information extraction unit 701, the reference plane extraction unit 702, the direction determination unit 711, and the dimension arrangement unit 712 in FIG.

  The input device 4303 is, for example, a keyboard, a pointing device, or the like, and is used for inputting an instruction or information from a user or an operator. The output device 4304 is, for example, a display device, a printer, a speaker, or the like, and is used to output an inquiry to a user or an operator or a processing result. The processing result includes a two-dimensional drawing or a three-dimensional drawing, and the output device 4304 can be used as the output unit 514.

  The auxiliary storage device 4305 is, for example, a magnetic disk device, an optical disk device, a magneto-optical disk device, a tape device, or the like. The auxiliary storage device 4305 includes a hard disk drive. The information processing apparatus can store programs and data in the auxiliary storage device 4305 and load them into the memory 4302 for use. The auxiliary storage device 4305 can be used as the storage unit 511.

  The medium driving device 4306 drives the portable recording medium 4309 and accesses the recorded contents. The portable recording medium 4309 is a memory device, a flexible disk, an optical disk, a magneto-optical disk, or the like. The portable recording medium 4309 includes a compact disk read only memory (CD-ROM), a digital versatile disk (DVD), a universal serial bus (USB) memory, and the like. A user or an operator can store programs and data in the portable recording medium 4309 and load them into the memory 4302 for use.

  As described above, the computer-readable recording medium for storing the program and data used in the drawing generation processing includes physical (non-temporary) such as the memory 4302, the auxiliary storage device 4305, and the portable recording medium 4309. Recording medium).

  The network connection device 4307 is a communication interface that is connected to a communication network such as a local area network (LAN) or the Internet and performs data conversion accompanying communication. The network connection device 4307 can be used as the output unit 514.

  The information processing apparatus can receive a processing request from the user terminal via the network connection apparatus 4307 and transmit a two-dimensional drawing or a three-dimensional drawing as a processing result to the user terminal. The information processing apparatus can receive a program and data from an external apparatus via the network connection apparatus 4307 and load them into the memory 4302 for use.

  Note that the information processing apparatus does not have to include all the components shown in FIG. 43, and some of the components can be omitted depending on the application and conditions. For example, when the information processing apparatus receives a processing request from the user terminal via the communication network, the input device 4303 and the output device 4304 may be omitted.

  Although the disclosed embodiments and their advantages have been described in detail, those skilled in the art can make various modifications, additions and omissions without departing from the scope of the present invention as explicitly set forth in the claims. Let's go.

511 Storage unit 512 Extraction unit 513 Generation unit 514 Output unit 701 Model information extraction unit 702 Reference plane extraction unit 711 Direction determination unit 712 Dimensional arrangement unit 2801, 2802, 3101 to 3104 Center position 2803 Intermediate position 2811, 2812, 3111, 3112, S1 to S3 planes 3301 to 3033 Edges 3311 to 3313, 4101 to 4103 Symbols 3401 to 3403, 3501 to 3503, 4201 Size 3801 Tag 4301 CPU
4302 Memory 4303 Input device 4304 Output device 4305 Auxiliary storage device 4306 Medium drive device 4307 Network connection device 4308 Bus 4309 Portable recording medium P201, P202, P203 Reference position

Claims (9)

A storage unit for storing shape data of the first part model and shape data of the second part model included in the three-dimensional assembly model;
An extraction unit that extracts a contact position where the first part model and the second part model are in contact based on the shape data of the first part model and the shape data of the second part model When,
A generating unit that obtains a dimension of the second part model based on the contact position and generates drawing information of the second part model including the dimension;
An output unit for outputting the drawing information;
A drawing generation apparatus comprising:   The storage unit indicates that the second part model is a lower part model of the first part model and a higher part model of the third part model included in the three-dimensional assembly model. Further storing configuration information, the extraction unit based on the configuration information, the contact position where the first part model and the second part model are in contact, the second part model and the A contact position where the third part model is in contact is extracted, and a contact position where the first part model and the second part model are in contact is selected as a reference for the dimension. The drawing generation apparatus according to claim 1.   The configuration information is included in the information of the three-dimensional assembly model, the second part model is assembled on the first part model, and the third part model is formed on the second part model. The drawing generation apparatus according to claim 2, wherein the drawing generation apparatus is in an assembled state.   The extraction unit calculates the volume of the first part model, the volume of the second part model, and the volume of the third part model, and when the volume of the first part model is maximum, The second part model in contact with the first part model is extracted as a lower part model of the first part model, and the third part in contact with the second part model 3. The drawing generation apparatus according to claim 2, wherein the configuration information is generated by extracting a model as a lower part model of the second part model.   The extraction unit includes an area of a first contact surface where the second part model is in contact with the first part model, and the second part model is in contact with the third part model. And calculating an area of the second contact surface, and extracting the first contact surface as the contact position when the area of the first contact surface is larger than the area of the second contact surface. The drawing generation apparatus according to claim 1.   The drawing generation apparatus according to claim 1, wherein the generation unit generates a symbol indicating the contact position on the drawing information.   The generation unit obtains a dimension of the second part model with reference to a predetermined position specified by the three-dimensional assembly model, generates the drawing information including the dimension with the predetermined position as a reference, and outputs the output The unit displays the drawing information on a screen, and when the predetermined position does not coincide with the contact position, the unit highlights the dimension based on the predetermined position. The drawing generation device according to any one of claims 6 to 7. A drawing generation method executed by a computer,
Referring to a storage unit that stores shape data of the first part model and shape data of the second part model included in the three-dimensional assembly model;
Based on the shape data of the first part model and the shape data of the second part model, a contact position where the first part model and the second part model are in contact is extracted,
Determining the dimension of the second part model with reference to the contact position;
Generating drawing information of the second part model including the dimensions;
A drawing generation method characterized by the above. Referring to a storage unit that stores shape data of the first part model and shape data of the second part model included in the three-dimensional assembly model;
Based on the shape data of the first part model and the shape data of the second part model, a contact position where the first part model and the second part model are in contact is extracted,
Determining the dimension of the second part model with reference to the contact position;
Generating drawing information of the second part model including the dimensions;
A program that causes a computer to execute processing.