JP2006260199A - Design support system, three-dimensional shape processing method, and three-dimensional shape processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently prepare a cavity face and a core face from the data of a product shape. <P>SOLUTION: An attribute selection part 12 selects a reference face A and the attribute G of the face A (cavity/core) from a three-dimensional solid model β. Once selected, a reference vector calculation part 13 calculates a reference vector Va as a vector in a direction not directed to the three-dimensional data among normal lines of the reference face A selected by the attribute selection part 12. An object vector calculation part 14 calculates an object vector Vb as a vector in a direction not directed to the three-dimensional data among the normal lines other than the reference face A (object surface B). A scalar product calculation part 15 calculates the scalar product C of the standard vector Va and the object vector Vb and when the scalar product C is positive, this part adds the same attributes as the attributes selected in the attribute selection part 12. After the attributes are added to all the faces, the same attributes are combined by a face connection part 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a design support system, and relates to a design support system having a function of extracting a cavity surface and a core surface, a three-dimensional shape processing method, and a three-dimensional shape processing program.

  With the spread of computer-aided design devices having a three-dimensional solid modeling function, it is frequently practiced to effectively use the three-dimensional solid model created in the product design process in the subsequent process.

  One of the post-processes described above is a mold design process. In the conventional mold design process, as one of the processes, the mold designer visually confirms the 3D solid model of the target shape on the screen and confirms the positional relationship of each surface (surface). However, it has been determined whether the surface is a cavity surface or a core surface.

Patent Document 1 proposes a technique for improving the efficiency of creating male and female molds and providing a product shape evaluation method for mold design that can shorten the period until product introduction. ing.
Japanese Patent Laid-Open No. 11-147226 (page 7, FIG. 1)

  However, in the technique of Patent Document 1, it is necessary to input a number of parameters first in order to obtain the evaluation result of the product shape, and the actual mold design is not always always efficient.

  That is, in mold design, it may be desirable to be able to immediately determine which surface of the product shape is the cavity surface and which surface is the core surface. At that time, there is also a demand for inputting the minimum amount of information to efficiently determine the cavity surface and core surface from the product shape and to output the surfaces with the same attributes as one (or a group) surfaces. Many.

  Therefore, the present invention has been made to solve the above-mentioned problem, and a design support system for efficiently creating a cavity surface and a core surface from product shape data by inputting the necessary minimum data, and a three-dimensional shape. It is an object of the present invention to provide a processing method and a three-dimensional shape processing program.

  In order to solve such a problem, the design support system according to the present invention is an attribute that allows the user to select whether the reference plane, which is one plane selected from the three-dimensional shape, is a cavity attribute or a core attribute. A selection unit; a reference vector calculation unit that calculates a reference plane vector that is a vector that does not face the three-dimensional data among the normals of the reference plane selected by the attribute selection unit; and the attribute selection unit. Target vector calculation means for calculating, for each target plane, a target vector that is a vector in a direction not facing the three-dimensional data among the normals of the target plane that is a plane other than the selected reference plane; and the reference plane And attribute adding means for adding the attribute selected by the attribute selecting means to the target surface where the inner product of the reference vector and the target vector is a positive value; Is a feature that it has a coupling means for coupling a surface which is added the same attribute by serial attribute addition unit.

  The three-dimensional shape processing method according to the present invention includes an attribute selection step for selecting whether the reference surface, which is one surface selected from the three-dimensional shape, is a cavity attribute or a core attribute. A reference vector calculation step for calculating a reference plane vector which is a vector in a direction not facing the three-dimensional data among the normals of the reference plane selected by the attribute selection step; and the selection by the attribute selection step A target vector calculation step of calculating, for each target plane, a target vector that is a vector in a direction not directed to the three-dimensional data among normals of a target plane that is a plane other than the reference plane; An attribute addition step for adding the attribute selected by the attribute selection step to the target plane in which the inner product of the reference vector and the target vector has a positive value. And-up, which features a having a binding step of binding the surface of the same attribute is added by the attribute addition step.

  The three-dimensional shape processing program according to the present invention further includes an attribute selection step for selecting whether the reference surface, which is one surface selected from the three-dimensional shape, is a cavity attribute or a core attribute. A reference vector calculation step for calculating a reference plane vector which is a vector in a direction not facing the three-dimensional data among the normals of the reference plane selected by the attribute selection step, and the selection by the attribute selection step A target vector calculation step of calculating, for each target plane, a target vector that is a vector in a direction not directed to the three-dimensional data among normals of a target plane that is a plane other than the reference plane; the reference plane; and the reference plane Attribute addition for adding the attribute selected by the attribute selection step to the target surface where the inner product of the vector and the target vector is a positive value A step, and the feature that it has a coupling step of coupling the surface of the same attribute is added by the attribute addition step.

  Cavity and core surfaces can be created efficiently from product shape data.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a design support system according to an embodiment of the present invention. As shown in the figure, this design support system 100 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) in which a program for controlling the entire system executed by the CPU, various parameters, and the like are stored. A control processor 1, a RAM (Random Access Memory) 2 used as a work area of the system, an input device 3 for inputting commands and requests to the system, such as a mouse, a keyboard, and a microphone, and an LCD ( An output device 4 that outputs processing results of the system such as a Liquid Crystal Display (CRT), a CRT (Cathode Ray Tube), and a speaker, and a network network outside the system such as the Internet or an intranet. A network interface 5 for performing signal, and a like bus 6 as a transmission path connecting these.

  The control processor 1 controls the data reading unit 11, the attribute selection unit 12, the reference vector calculation unit 13, the target vector calculation unit 14, the inner product calculation unit 15, and the attribute addition unit 16 according to a control program α stored in a ROM (not shown). , Function as a surface coupling unit 17 and a result output unit 18.

  The data reading unit 11 reads information such as CAD (Computer Aided Design) data stored externally via the RAM 2 or the network interface 5.

  The attribute selection unit 12 allows the user to select an attribute as to whether a reference surface (reference surface A), which will be described later, is a so-called cavity surface or a core surface used when creating a mold.

  The reference vector calculation unit 13 calculates a normal vector (reference vector Va) of the reference plane A.

  The target vector calculation unit 14 is a normal vector (target vector Vb) of a surface (target surface B) other than the reference surface A that is a target of calculation of the cavity surface or the core surface in the read three-dimensional CAD solid model. Is calculated.

  The inner product calculation unit 15 calculates the inner product (inner product C) of the vector of the reference vector Va and the target vector Vb.

  The attribute adding unit 16 determines the result of the inner product C, and adds one of the attributes of cavity / core / error to each surface of the read three-dimensional solid model.

  The surface combining unit 17 combines surfaces having the same attribute added by the attribute adding unit 16 as one (group) surface.

  The result output unit 18 outputs the calculation result of the control program α to the RAM 2 and the output device 4.

  Next, the operation of the design support system 100 of this embodiment will be described. FIG. 2 is a flowchart showing the operation of the design support system according to the embodiment of the present invention. As described above, the control processor 1 performs the operation of FIG. 2 by the control program α stored in the ROM (not shown).

  In this design support system, it is assumed that a three-dimensional solid model has been read into the system. That is, it is assumed that the product shape (three-dimensional solid model) created by the designer using three-dimensional CAD or the like is stored in the RAM 2 of the design support system 100 by the user using the input device 3. However, the design support system 100 may be configured to access a model stored in a predetermined storage area via the network interface 5.

  In this embodiment, for example, it is assumed that the model shown in FIG. 3 is read. FIG. 3 is a diagram showing an example of a three-dimensional solid model. The three-dimensional solid model β shown in the figure is a model having a substantially concave shape with four sides covered with a plane and having a hole and a boss on one surface. Although not shown in FIG. 3 so as to be clearly understood, the four planes covering the four sides are so-called tapered and have an obtuse inclination with respect to the surface having the hole or the boss. Configured.

  When the system is activated in the above-described model of FIG. 3, first, a reference plane A selection instruction is requested (step S10). That is, when the operation of this system is started, the attribute selection unit 12 outputs the read three-dimensional CAD solid model via the output device 4 and becomes the reference of the cavity surface (or core surface) to be created from now on. Request to select one surface (reference surface A).

  FIG. 4 is a diagram showing a display result from the output device 4 when Step S10 is executed. When the three-dimensional solid model β is read and this system is started, the three-dimensional solid model β is displayed from the display screen as the output device 4 as shown in FIG. 4, and the reference plane A is selected as shown in this figure. A request is output.

  Here, it is assumed that the user selects a surface γ that is a surface having a hole or a boss through the input device 3 in response to the request in step S10.

  Next, the design support system 100 does not perform the processing after step S30 until the above-described reference plane A is selected (step S20).

  That is, if the user does not select the reference plane A even in response to the request from the attribute selection unit 12 described above (No in step S20), the processes after step S30 are not performed until the reference plane A is selected.

  On the other hand, when the user selects the reference plane A (Yes in step S20), an instruction for selecting the attribute of the reference plane A is given (step S30). In other words, the attribute selection unit 12 requests selection of an attribute (attribute G) as to whether the reference surface A selected by the user is a so-called cavity surface or core surface used when designing a mold.

  FIG. 5 is a diagram showing a display result from the output device 4 when Step S30 is executed. The input in step S30 may be configured to be input by typing characters or commands on the keyboard, or as shown in FIG. 5, the cavities and core characters are displayed and selected with a mouse or the like. You may comprise.

  Here, it is assumed that the user inputs that the surface γ that is the reference surface A selected as the attribute G via the input device 3 is the “core surface” in response to the request in step S30.

  Next, the design support system 100 does not perform the processing after step S50 until the attribute G described above is selected (step S40).

  That is, if the user does not select the attribute G even in response to the request from the attribute selection unit 12 described above (No in step S40), the processing after step S30 is not performed until the attribute G is selected.

  On the other hand, when the user selects the attribute G (Yes in step S40), a normal vector (reference vector Va) on the reference plane is calculated (step S50). That is, the reference vector calculation unit 13 calculates a normal line from the selected reference plane A, and calculates a reference vector Va that is a normal vector of the reference plane A from this normal line. Here, the three-dimensional solid model has a property that the surface (surface) exists on the surface of the shape. Therefore, the direction of the normal vector can be defined as the direction of the normal vector on the side having no shape.

  FIG. 6 is a diagram showing a cross section in the SS direction of FIG. 5. FIG. 6 (a) is a diagram for explaining examination of vector calculation, and FIG. 6 (b) is a diagram showing calculation results of a reference vector Va and a later-described target vector Vb.

  In the three-dimensional solid model β, since the surface γ is selected as the reference surface A in step S10, first, both (1) and (2) are used as the normals of the surface γ as shown in FIG. A normal including the direction of is calculated. Then, based on the definition described above, the reference vector Va is determined as the side of (1).

  Next, a normal vector (target vector Vb) in the target plane B is calculated (step S60). That is, the target vector calculation unit 14 calculates a normal on each of the surfaces other than the selected reference surface A (target surface B) in the selected read three-dimensional solid model β, and this normal To calculate a target vector Vb which is a normal vector of the target plane B. The direction of the normal vector of the target vector Vb is also calculated in the same manner as the above-described reference vector Va.

  For example, in the plane δ which is one target plane B shown in FIG. 6A, first, a normal including both the directions (3) and (4) is calculated as the normal of the plane δ. Then, according to the definition described above, the target vector Vb is determined as the side of (3). By performing such processing, the reference vector Va and the target vector Vb are determined for the three-dimensional solid model β as shown in FIG.

  Next, an inner product (inner product C) of the calculated reference vector Va and the target vector Vb is calculated (step S70). That is, the inner product calculation unit 15 calculates the inner product (Va · Vb) between the reference vector Va calculated by the reference vector calculation unit 13 and the target vector Vb calculated by the target vector calculation unit 14 to obtain the inner product C.

  Next, the inner product calculation unit 15 determines whether or not the calculated inner product C is positive (inner product C> 0) (step S80). As a result, when the inner product C is positive (Yes in step S80), the attribute selected by the attribute G is added to the reference plane A and the target plane B (step S90).

  FIG. 7 is a diagram for explaining calculation of the inner product C in the plane δ, the plane ε, and the plane ζ. For example, for the surface δ in the three-dimensional solid model β, the target vector Vb is calculated in step S60 as shown in FIG. When the reference vector Va calculated in step S50 is translated with respect to the target vector Vb, the two vectors form an angle θ1 as shown in the figure. In FIG. 7, since this θ1 is smaller than 90 degrees, the inner product C has a positive value. As a result, the attribute “core surface” which is the same attribute as the attribute G specified for the surface γ is added to the surface δ. Will be.

  On the other hand, if the inner product C is not positive (No in step S80), then the inner product calculation unit 15 determines whether the calculated inner product C is negative (inner product C <0) (step S120).

  As a result, when the inner product C is negative (Yes in step S120), the attribute adding unit 16 adds the attribute not selected by the attribute G to the target surface B (step S130).

  For example, on the surface ε in the three-dimensional solid model β, an angle θ2 is formed by the reference vector Va and the target vector Vb as shown in FIG. In FIG. 7, since this θ2 is larger than 90 degrees, the inner product C has a negative value, and as a result, the attribute “cavity surface” which is an attribute different from the attribute G specified for the surface γ is added to the surface ε. Will be.

  If the inner product C is neither positive nor negative (No in step S120), the attribute adding unit 16 adds an “error” attribute to the target surface B (step S140), and outputs that effect. (Step S150).

  For example, in the plane ζ in the three-dimensional solid model β, an angle θ3 is formed by the reference vector Va and the target vector Vb as shown in FIG. In FIG. 7, θ3 is exactly 90 degrees, so that the inner product C has a value of 0 (zero). As a result, the surface ζ has either the attribute specified for the surface γ or a different attribute. Therefore, the “error” attribute is added. Then, the result output unit 18 outputs that the “error” attribute is added to the surface ζ. This output may be displayed by the output device 4 or may be configured to notify the user by adding a predetermined color to the surface to which the error attribute is added.

  Next, the design support system 100 determines whether or not attributes have been added to all the faces (step S100). That is, it is determined whether or not the attribute adding unit 16 has added attributes to all the faces of the three-dimensional solid model β (whether or not the attribute addition has been completed).

  As a result, when the attribute addition to all the surfaces has not been completed (No in step S100), the process returns to step S60 and the above-described processing is performed on the unprocessed surface.

  On the other hand, when the addition of attributes to all the surfaces is completed (Yes in step S100), the surfaces having the same attribute are combined as one (group) surfaces (step S110). That is, the surface combining unit 17 performs a combining process on a surface having the same attribute in the three-dimensional solid model β by the above-described processing.

  8 to 10 show diagrams when the processing is completed in the three-dimensional solid model β. 8 is a diagram showing the output result of the core surface, FIG. 9 is a diagram showing the output result of the cavity surface, and FIG. 10 is a diagram showing the output result of the surface to which the error attribute is added. 8 to 10, a perspective view is shown in (a) of the figure, and an SS cross section in FIG. 5 is shown in the output result in (b) of the figure. In FIGS. 10B and 10A, other surfaces are indicated by dotted lines in order to make it easy to grasp the positional relationship.

  As described above, when the system surface is processed by designating the reference surface A as the surface γ and its attribute G as the “core surface” in the three-dimensional solid model β, the core surface is shown in FIG. ) Is a solid line portion), the cavity surface is FIG. 9 (solid line portion in FIG. 9B), and the surface to which the error attribute is added is FIG. 10 (solid line portion in FIG. 10B).

  The created surface is stored in the storage area in which CAD data is stored via the RAM 2 or the network interface 5 by the result output unit 18, but the result is a shape that is color-coded for each attribute. The data may be output to the user as data.

  By performing the above processing, the cavity surface and the core surface can be efficiently created from the product shape data.

The figure which shows the structure of the design support system concerning one Embodiment of this invention. The flowchart which showed operation | movement of the design support system which concerns on embodiment of this invention. The figure which showed an example of the three-dimensional solid model. The figure which showed the display result from the output device 4 when step S10 is performed. The figure which showed the display result from the output device 4 when step S30 is performed. The figure which showed the cross section of the SS direction of FIG. The figure explaining calculation of the inner product C in the surface δ, the surface ε, and the surface ζ. The figure which showed the output result of the core surface. The figure which showed the output result of the cavity surface. The figure which showed the output result of the surface where the error attribute was added.

Explanation of symbols

1 Control processor 2 RAM
3 Input device 4 Output device 5 Network interface 6 Bus A Reference plane B Target plane B
G attribute Va reference vector Vb target vector Vb
α Control program β Three-dimensional solid model β
δ, γ, ε, ζ plane

Claims (10)

Attribute selection means for selecting whether the reference plane, which is one plane selected from the three-dimensional shape, is a cavity attribute or a core attribute;
Reference vector calculation means for calculating a reference plane vector which is a vector in a direction not facing the three-dimensional data among the normal lines of the reference plane selected by the attribute selection means;
Target vector calculation means for calculating, for each target plane, a target vector that is a vector in a direction not facing the three-dimensional data, among normals of the target plane that is a plane other than the reference plane selected by the attribute selection section. When,
Attribute addition means for adding the attribute selected by the attribute selection means to the reference plane and the target plane whose inner product of the reference vector and the target vector is a positive value;
Combining means for combining the surfaces to which the same attribute is added by the attribute adding means;
Design support system characterized by having   2. The attribute adding unit adds an attribute not selected by the attribute selecting unit to the target plane in which an inner product of the reference vector and the target vector is a negative value. The design support system described in 1.   The design support system according to claim 1, wherein the attribute adding unit adds an error attribute to the target surface where an inner product of the reference vector and the target vector is zero.   4. The design support system according to claim 3, further comprising an output means for outputting an error attribute when the attribute attribute is added by the attribute adding means. An attribute selection step for selecting whether the reference plane, which is one plane selected from the three-dimensional shape, is an attribute of a cavity or an attribute of a core;
A reference vector calculation step of calculating a reference plane vector that is a vector in a direction not facing the three-dimensional data among the normals of the reference plane selected by the attribute selection step; and A target vector calculation step of calculating, for each target plane, a target vector that is a vector in a direction not directed to the three-dimensional data among normals of a target plane that is a plane other than a reference plane;
An attribute adding step of adding the attribute selected by the attribute selecting step to the reference plane and the target plane having a positive inner product of the reference vector and the target vector;
A three-dimensional shape processing method comprising: a step of combining the surfaces to which the same attribute is added in the attribute adding step.   2. The attribute adding step adds an attribute not selected by the attribute selecting step to the target plane in which an inner product of the reference vector and the target vector is a negative value. The processing method of the three-dimensional shape as described in 2.   The method of processing a three-dimensional shape according to claim 1 or 2, wherein the attribute adding step adds an error attribute to the target surface where the inner product of the reference vector and the target vector is zero.   4. The three-dimensional shape processing method according to claim 3, further comprising: an output step of outputting an error attribute when an error attribute is added in the attribute adding step. An attribute selection step for selecting whether the reference plane, which is one plane selected from the three-dimensional shape, is an attribute of a cavity or an attribute of a core;
A reference vector calculation step for calculating a reference plane vector which is a vector in a direction not directed to the three-dimensional data among the normals of the reference plane selected by the attribute selection step, and the selected by the attribute selection step A target vector calculation step of calculating, for each target plane, a target vector that is a vector in a direction not directed to the three-dimensional data among normals of a target plane that is a plane other than a reference plane;
An attribute adding step for adding the attribute selected by the attribute selecting step to the reference plane and the target plane in which an inner product of the reference vector and the target vector is a positive value;
A three-dimensional shape processing program, comprising: a joining step for joining surfaces to which the same attribute is added in the attribute adding step.   2. The attribute adding step adds an attribute not selected by the attribute selecting step to the target plane in which an inner product of the reference vector and the target vector is a negative value. A processing program for a three-dimensional shape described in 1.

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