JP3365991B2 - Mechanical parts design support system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical component design support system and a recording medium storing a mechanical component design support program.

[0002]

2. Description of the Related Art In recent years, in product development work, there has been a demand for rapid development to meet the rapidly changing needs of consumers. Under such circumstances, CAD supporting design work is required.
The system is receiving attention. CAD systems are roughly divided into problem-oriented CAD systems constructed to solve certain problems and general-purpose CAD systems.

In an industry in which routine design is repeated, problem-oriented C
There are some cases where the AD system has achieved a certain effect, but in the consumer product, especially in the mechanical design department, the product life cycle is short and technological innovation is fast, so C
The AD system cannot support. Further, since the design knowledge installed in the CAD system is hidden and implemented in the system, maintenance and management such as update and new registration of knowledge are very difficult.

Here, the flow of mechanism design will be described taking a camera as an example. Usually, the use of the product (basic concept) is decided at a planning meeting or the like. After that, the design (exterior), the mechanism, the design of the software, etc. will begin. Regarding the mechanism, the required specifications are determined for each unit. Design is to search for a design solution that satisfies this requirement.

FIG. 22 shows steps for designing a mechanical unit. First, a mechanism plan is created. That is, a mechanism plan for controlling the operation of parts is constructed by a skeleton model (the shape of some parts may be decided first). As for the mechanism plan, the actual operation is confirmed on the punch picture, and the mechanism that meets the requirements is selected as the design plan at this stage (UG.
S: Possible with Imagination Engineer etc.)

An actual assembly is made up of a plurality of parts, and when a set of parts is taken out of the set and the shape of each part and the limited movement of each part are examined, this combination is used. Is called a mechanism. When investigating only the motion, it is not necessary to consider the material and thickness of the components that make up the mechanism, and therefore it is possible to treat it as a combination of points and lines that result in exactly the same fixed motion. In this way, the representation of the mechanism by dots and lines is called a skeleton (Ohma Inc. Shigeo Inada,
Hitoshi Morita, "Mechanism of University Process").

Once the mechanism proposal is confirmed by the skeleton model,
Next, the two-dimensional shape of the part is designed. At this time, the shape may be determined by the shape determined for exhibiting the function and the interaction with other parts or units. Further, when the outer shape is previously determined, the function as a mechanism for driving the shape is given to the shape by using the skeleton model. Two-dimensional shapes are usually drafters and drafting C
The shape is defined by AD, and its operation is verified by paperwork or copying of the shape. At this time, a two-dimensional interference check with other parts is performed and the two-dimensional shape is detailed (normal drafting CAD is possible).

After the two-dimensional shape is determined, the three-dimensional shape of the part is designed next. This is performed by adding information on the height (thickness) as a three-dimensional shape to the two-dimensional shape (projection drawing creation by drafting CAD). Then, the interference with other parts is checked in three dimensions and the three-dimensional shape is detailed. In this way, the design of mechanical parts is basically 2.5.
It is done in three dimensions. Designers do most of these tasks
It is done on a drafter or a two-dimensional drafting CAD.

If necessary, a three-dimensional solid model is created from the parts thus designed. As a method for creating a solid model, manual operation on three-dimensional CAD or automatic generation (Japanese Patent Laid-Open No. 8-335279) can be considered.

In the conventional design, after the designer selects the mechanism plan, some parameters are operated to select the design plan. At this time, a skilled designer can derive an optimal solution from experience and intuition, but a young designer needs a great number of steps to optimize the design plan. Further, the design plan selected is not always optimal for both the mature designer and the young designer. In this way, the ability of the designer makes a big difference in the speed and quality of the design.

Further, design problems such as interference of parts, assemblability, displacement due to an injection molding die and undercutting occur. Since these systems do not have a system for systematically organizing design knowledge, it is impossible to reuse the knowledge, and it takes man-hours for countermeasures as a recurrence defect. In addition, the lack of knowledge has also affected the education of young designers.

In the contents of design work, the following are known as individual tools. Skeleton design UGS: Imagination Engineer (trademark) 2D shape design General purpose 2D CAD system 3D shape design General purpose 2D CAD system General purpose 3D CAD system However, these systems are built as design support for individual work. , There is no consistent support. Further, work such as data conversion between systems that is not directly related to the design occurs, which is inefficient in terms of shortening the design period. Furthermore, input the knowledge of the designer
Since it is difficult to edit and the knowledge that the system has is hidden, it is difficult to use new knowledge or browse the details of past knowledge.

Further, as a system for improving the efficiency of arrangement / assembly work between parts, there is disclosed in Japanese Patent Application Laid-Open No. 10-254939:
There is a mechanism design support device and its method, etc., but we have been able to support the creation of part shapes by competing with other parts, but not the creation of a mechanism proposal in a completely new design. Also, since the designer himself creates the actual three-dimensional part model, a great number of man-hours are required.

Further, the design document created as a result of the design includes not only the shape of the parts but also the information such as the processing method, the material and the tolerance. However, the present two-dimensional CAD system is just a character string. Since the three-dimensional CAD system handles only the shape, it is impossible to add these pieces of information to the data for reuse.

Further, when a mechanical part is produced by using a mold, the mechanical part cannot be removed from the mold simply by providing the two-dimensional structure with a thickness. In order to prevent this, a draft may be provided to the mold, but it is extremely troublesome to make a new design for defining the draft in the mold.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and its purpose is to perform optimal design in a short time regardless of the skill of the designer. It is to provide a mechanical component design support system that can be used and also enables reuse of knowledge.

Another object of the present invention is to provide a recording medium storing a mechanical component design support program for realizing the mechanical component design support system by a computer.

[0018]

In order to solve the above problems and achieve the object, the present invention is constructed as follows.

The mechanical component design support system of the present invention has a mechanism object library that stores knowledge for defining a plurality of mechanical components that can be used in a skeleton model based on assembly structure information, and to achieve the required purpose. enter the mechanisms proposed by the skeleton model, a verification unit for verifying the function of the skeleton model, the two-dimensional shape of the mechanical components which are selected from the mechanism object library and generates in response to the required specification of the mechanism proposed Dried
Checking the relations, etc., and generating the two-dimensional shape
A model for redefining and storing the two-dimensional shape editor for repeating the examination and optimizing the two-dimensional shape, and the attributes output from the two-dimensional shape editor for defining the mechanical parts by the assembly structure. A base, a penetration line computing means for computing a penetration line between two-dimensional surface portions output from the two-dimensional shape editor, and a parallel movement of the surface segment from the two-dimensional shape based on the assembly structure information. Let
The mechanical component includes solid model generation means for generating a three-dimensional solid model of the mechanical part by parallel sweep, and two-dimensional projection diagram generation means for generating a two-dimensional projection drawing of the generated three-dimensional solid model. It is characterized in that the attributes of are integratedly managed by assembling structure information.

(Operation) According to the mechanical parts design support system of the present invention, the information of the mechanical parts is centrally managed by the assembly structure,
Generation of a mechanism plan by a skeleton model when selecting a mechanism plan, and mechanism motion simulation in which a part (or all) of a two-dimensional shape is determined from a mechanism motion simulation, automatic generation of a three-dimensional shape, and three-dimensional shape It is possible to support consistent mechanical component design up to the mechanical operation simulation in. Therefore, the optimum design can be performed in a short time regardless of the skill level of the designer, and the knowledge can be reused.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a functional block diagram showing the configuration of a mechanical parts design support system (parts detailed design editor) according to the first embodiment of the present invention. In the figure, the solid line shows the message and data, and the broken line shows the data flow. It should be noted that each function in the present embodiment can also be realized by a computer that reads a program recorded in a recording medium such as a magnetic disk and the operation of which is controlled by the program.

The system of this embodiment is roughly divided into
Graphic user interface (GUI) 10,
It is divided into three elements, a component editing system 20 and a data unit 40. The functional blocks of this system will be described below.

The GUI 10 is a part that provides an environment that is easy for a designer who is a user to operate, and includes command buttons 11 for editing a part, a mouse 12, and a two-dimensional bounded surface of the part. ), An object viewer 14 for displaying a surface segment and a line segment as an object tree, and the like.

A surface segment means a surface having an infinite area,
It is a surface that has a finite area within a closed region by giving a closed contour shape.

The object tree is a database that manages upper and lower subordinate relationships of assembled objects in a tree structure. Further, the canvas is a system for defining a two-dimensional contour shape, and its function is limited as compared with the drafting CAD for drawing creation.

The parts editing system 20 is the central mechanism of the parts detailed design editor, and includes the overall control unit 21 and the environment setting unit 2.
2, a screen control unit 23, a pick unit 24, a creation / deletion / surface segment generation unit 25, a 3D modeler unit 26, a phase line calculation unit 27,
It is composed of a redrawing unit 28, a drawing unit 31, a tree registration unit 32, and the like.

All the command buttons 11 of the GUI 10 and the callbacks of the mouse 12 are sent to the overall control unit 21, and the overall control unit 21 displaces the state based on the finite state machine defined in the control table, and the appropriate state is changed. It is processing.

The environment setting unit 22 sets the environment for designing, sets the scale of the drawing, the paper size, and the grid to be displayed, and manages the values. It also manages the setting of the snap grid of the mouse 12 on the canvas 13.

The screen control unit 23 manages the magnification of the canvas and the position of the canvas on the display. Since the place to draw the face is the display, not the actual paper,
If you do not move the canvas, you cannot draw on the entire paper. This is the position for that.

The pick section 24 is a functional block for picking up an object on the canvas 13. The picked-up object (surface or line) data is stored in the pick data. Then, this data is passed to the required functional block.

The creation / deletion / surface segment generation unit 25 is a functional block that creates and deletes line segments, arcs, and surface segments. The generated object is registered in the model base 42 described later in the form of an assembly structure.

Here, the part is composed of a plurality of functional elements, and the assembly is composed of parts or subordinate assemblies. These assemblies, parts, and functional elements are collectively called an assembly object. The assembly object has attributes such as dimensions, shapes, and materials that represent its characteristics. The layout of functional elements that make up a part is expressed by specifying the length dimension and the angle dimension. Similarly, the layout relationship between the parts that make up the assembly is
It is expressed by specifying the connection relationship between the functional elements that make up the component. The assembly structure expresses the upper and lower relationships of these assembly objects and the arrangement relationship between the assembly objects.

The drawing unit 31 is a mechanism for displaying an object on the canvas 13. The redrawing unit 28 is a mechanism that functions when it is necessary to redraw the entire canvas 13 when the management value in the environment setting unit 22 is changed or the screen control unit 23 changes the magnification. An object in the model base 42 is drawn with a new setting.

The tree registration section 32 is a mechanism for adding / deleting the objects generated / deleted by the generation / deletion / plane generation section 25 from the object view 14. 3D
The modeler unit 26 is a mechanism that automatically generates a three-dimensional solid model by using the surface attributes defined by the designer using the canvas 13 and the height attributes thereof. Phase line computing unit 27
Is a mechanism for calculating a crossing line between planes defined by the designer using the canvas 13.

The data 40 includes a data management unit 41,
There are a model base 42, a mechanism object management unit 43, a mechanism object library 44, a design knowledge management unit 45, and a design knowledge base 46. Here, the library is a collection of programs for performing general-purpose formalized processing, and the mechanism object library is a collection of knowledge about general-purpose mechanisms.

The data management unit 41 is a mechanism for managing the input / output of information of the model base 42. Further, the model base 42 manages the design information of the edited parts as an assembly structure. The actual data structure managed here is basically class (class of data), symbol \ na
It consists of me, label, boundaryBox (boundary box on canvas), display (display / non-display), and other class-specific parameters. Face1 data is polylin
It consists of the components of e1, polyline3, arc4, and arc5. Also, each surface component has its own parameters and attributes such as coordinates. It can have attribute information necessary for design.

As an example, face 1 in the lever of FIG.
The data of the components of (filled part) are shown in Table 1 below.
Shown in.

[0038]

[Table 1]

In the mechanism object library 44, the skeleton model forming the mechanism is registered. The model registered in this mechanism object library 44 is parametric, and its parameters and orientation (direction)
By changing, it is possible to define any size and orientation. The mechanism object management unit 43 manages the input and output of the mechanism object library 44.

The design knowledge base 46 stores the design knowledge of mechanical parts, and the design plan is searched based on this knowledge. The design knowledge management unit 45 manages the input and output of the design knowledge base 46.

The design knowledge base 46 stores general technical information regarding machining methods. Design knowledge base 46
Stores information such as mechanical strength, dimensional accuracy (tolerance), design limit values, optical characteristics, temperature and humidity characteristics, ease of molding and processing, availability, cost, supplier, etc. regarding the material of individual mechanical parts. To do. The design knowledge base 46 stores information on the injection molding technology such as design guidelines for gate positions and draft angles, whether or not to set the mold cutting direction, prediction of parting lines, sink marks, undercuts, burrs, and the number of durable shots of the mold. To do. In addition, it stores information about the ease of assembly and repair of the units that implement the mechanism. The design knowledge base 46 stores all of this information as design knowledge. It is desirable that the information of the design knowledge base 46 be added or revised at any time according to new design cases or product defect information. Design Knowledge Management Department 4
5 centrally manages the input / output of the design knowledge base 46. The information output from the design knowledge base 46 is transferred to the 3D modeler unit 26 of the component editing system 20 via the design knowledge management unit 45. Various information regarding the design is appropriately provided to the designer on the spot. Based on such design knowledge, the designer can quickly search for the optimum design solution without resorting to experience or intuition.

An example in which the system according to the present embodiment is applied to the design of a shutter unit for a digital camera will be described below. The operation flow at this time is shown in FIG.
~ Shown in FIG. 11 shows the entire operation flow, FIG. 12 shows in more detail (A) from skeleton selection / placement of FIG. 11 to operation confirmation, and FIG. 13 shows two-dimensional external shape editing of FIG. (B) is shown in more detail up to the height attribute addition of.

The specification of the shutter unit is that the shutter blade is driven by using the plunger, and the light beam from the lens is blocked by the blade. In addition, the size of the entire shutter unit is limited by the size of the entire camera and the size of the lens unit.

An example of the shutter unit and a skeleton model schematically showing it are shown in FIGS. 3 and 4. The shutter unit includes a plunger 51, a lever 52, and a blade 53.
It consists of three parts, and each has functional elements as shown in Table 2 below.

[Table 2]

Table 3 below shows the connection relationship between each component.
Shown in.

[Table 3]

In FIGS. 3 and 4, 54 is a lens frame and 5
5 is an iron core, 56 is a shutter frame, 57 is the center of rotation of the blade, 5
Reference numeral 8 indicates the lever side lever pin position, and 59 indicates the lever rotation center.

A functional element is a section in which a function is expressed in the design stage, which is considered as a unit of design work, and a component is defined by a set of functional elements. Types of functional elements include a plane, a cylindrical surface, a conical surface, a spherical surface, a slope, and a machine functional surface. The slope is a surface generated by the course of the surface separation, and a side surface parallel to the reference line of the parallel-swept solid,
When the cylinder is defined from the top, the cylinder is defined using a circle in two dimensions. A parallel cylinder is formed by sweeping this circle in parallel, and the side surface (cylindrical surface) created by this parallel sweep is the slope. The machine functional surface is a functional surface as a mechanical component such as a gear surface and a cam surface.

Next, FIG. 5 shows the assembly structure of the shutter unit.
Shown in. When considered as a mechanism, the mechanism skeleton model shown in FIG. 5 is generated. At this point in time, since it is expressed by a skeleton model and parts are expressed to understand the mechanism, long holes and the like are simply expressed, and only parts such as fulcrums, force points, and action points that are necessary to operate as a mechanism are expressed. It is shown.

Change the parameters of the skeleton model,
It is operated to optimize the design solution as a mechanism. Changing the parameters also includes changing the arrangement coordinates, and it is possible to perform optimization including the layout by changing the arrangement coordinates and dimensions. Regarding the dimensions, the distances Da, Db, Dc, and Dd are calculated after the arrangement coordinates of each component, and the stroke ratio is calculated from the calculated values.

In generating candidate design solutions by changing these layouts and dimensions, is it possible to verify the interference regarding each component and the layout and to operate the mechanism to secure the stroke required by the blade. To confirm.

Usually, when performing a motion simulation, it is necessary to input a constraint condition, and the motion analysis must also be performed. However, since the target is a mechanical unit in the support environment, the operation is obvious from the structure of the unit, and by describing the structure and operation method in the object library, the need for analysis is eliminated. By repeating these design proposals and verification, the design proposals are narrowed down.

Next, a two-dimensional shape is given to the skeleton model. The shape is given by adding a contour element to the assembly structure of the parts. Since the two-dimensional shape is defined mainly by injection molding using a mold, it is defined in the view in the mold cutting direction after considering the mold split of the mold.

An example of the two-dimensional shape definition of the shutter lever of the shutter unit is shown in FIGS. 6 shows a fixed side shape, and FIG. 7 shows a movable side shape. In this way, the mechanism is operated while defining the two-dimensional shape to perform more detailed verification such as interference check than at the skeleton model stage. In addition, the contour element is edited as necessary, and the verification is performed again. Here again, shape generation and verification are repeated to further narrow down design proposals.

Next, with the two-dimensional shape closed, a height attribute is given to each surface. Then, according to this height attribute, each surface is translated. The result of such parallel translation is shown in FIG.

The parallel-moved surfaces are solidified by parallel sweep. At this time, each surface segment is swept parallel to the reference surface, and after all the surface segments are solidified, the solids are combined to form one component solid. The result of solidification of parts is shown in FIG.

Similarly, the honey is solidified.
It is also possible to use a library model for the plunger for purchased parts. An example of the solid model of the shutter unit is shown in FIG.

The mechanical operation using such a solid model is performed to verify the final design proposal. Here, when a problem such as interference occurs, it is necessary to regenerate the design plan such as changing the height of the surface portion, changing the two-dimensional shape, or changing the mechanism plan itself.

As described above, according to the present embodiment, by using the assembly structure in the mechanical part design support system, it becomes possible to centrally manage all the information of the mechanical parts by the injection molding of the camera. Further, the editing of the assembly structure can be performed by the designer without any discomfort when designing the mechanical parts. By using this assembly structure, it is possible to centrally manage the data of the target parts from design to production, reduce the data exchange and the labor (man-hours) associated therewith, and prevent the data loss caused by the data conversion. be able to.

Further, by confirming the operation of the mechanism, the quality of the design can be improved, and defects such as interference can be confirmed at the stage before the trial production. Therefore, the design quality at the time of passing data to the subsequent process can be improved. It is possible. Furthermore, since solids are automatically generated, it is very familiar to designers.
It is possible to generate a three-dimensional solid by a three-dimensional design work, and the man-hours for creating the three-dimensional solid are unnecessary. Therefore, the design period can be shortened.

(Second Embodiment) In this embodiment, an example of designing a case component for supporting the shutter unit created in the first embodiment will be described. In order to support the shutter unit, a hole for fixing the plunger (for positioning and screwing), an axis that serves as the center of rotation of the lever, and an axis that serves as the center of rotation of the blade are required. It will be omitted here because it is supported on the case via the parts.

Since the plunger is fixed to the side surface of the case with screws, the two-dimensional projection of the side surface is required to define the hole. This is to create a case by the same method as in the first embodiment, then project the side surface of the case two-dimensionally in order to define the hole for fixing the plunger, and define the hole on the projection surface. That is the method.

FIG. 14 shows a case part before defining a hole for mounting a plunger. FIG. 15 shows a state in which a surface for forming a hole (hatched portion in FIG. 14) is projected on a two-dimensional canvas for this part.

When making this hole, one is a hole for screw tightening, and one is a hole for accommodating the protrusion of the positioning plunger. The size of the holes and the distance between the holes are automatically determined by the plunger used. To obtain these dimensions, the design knowledge base returns the dimensions from the plunger model number.

Using the dimensions obtained here, when the center position of one hole is determined, the system shows the position where the other hole can be arranged to the designer. Further, the dimensional tolerance required for molding is also automatically obtained from the dimension of the plunger stored in the knowledge base and the tolerance.

Newly on the surface projected on the canvas,
Two-dimensional shape with the attribute "hole" (circle in this case)
To create. FIG. 16 shows the state in which the two-dimensional shape of this hole is defined. Also, when considering it as a mold for injection molding,
The definition from the side (the definition of the hole in this case) becomes the definition of the slide as it is. As a result, when the component is formed by injection molding, it can be molded by the structure of the mold such as the fixed side, the movable side, and the slide.

Here, in the most basic two-plate mold, the fixed side mold (material injection side) attached to the fixed plate of the injection molding machine and the movable side mold attached to the movable plate of the molding machine. There is a mold, and after the material is injected, the movable side mold is moved to open the mold and take out the molded product inside. Therefore, the structure of the molded product is only the shape in the vertical direction, and holes in the lateral direction cannot be molded. To form a hole in the lateral direction, it is necessary to open the mold in the lateral direction when opening the mold, and this laterally opened mold is called a slide mold. Result The mold consists of fixed side, movable side and slide.

FIG. 17 shows the last defined hole reflected in the original solid model. As shown in FIG. 17, a hole for fixing the plunger is opened.

Next, the rotation axis that supports the lever will be defined. The lever needs to convert the force from the plunger into rotary motion and transmit it to the fly. For this reason, it is required that the shaft does not deform such as bending when receiving a force from the plunger. Here, the deformation of the shaft is prevented by providing ribs that reinforce the shaft.

The thickness of the rib is determined by various factors such as the material of the rib and the force from the plunger. At this point, ribs having a desired thickness are arranged two-dimensionally. FIG. 18 shows before the rib arrangement, and FIG. 19 shows after the rib arrangement.

As shown in FIG. 18, the simply arranged ribs bite into the shaft (in this case, the base portion of the shaft). This is because the shape is not determined only by arranging the ribs having the required thickness.

Next, the detailed shape of the rib will be defined. In this case, the shape of the rib is defined by the line of intersection with the side surface of the shaft. In this case, the line of intersection is an arc. In the general-purpose three-dimensional CAD system, this line of intersection is performed using a three-dimensional shape calculation engine called a solid modeler. As a method, it is possible to use a commercially available solid modeler to calculate the phase boundary line, but here, as the phase boundary line calculation in a method that does not depend on the solid modeler, a polyhedral approximation operation is considered.

In this method, the calculation is facilitated by replacing all the surfaces with minute planes. That is,
In this case, the cylindrical surface, which is the side surface of the shaft, is treated as a collection of extremely thin rectangular planes. Since the plane can be mathematically defined by the coordinates of four points, or an expression expressing the four sides, it is possible to easily calculate the line of intersection (interpenetration line) between the planes. In this case, the set of intersecting lines of the upper surface of the rib and the plurality of rectangular planes (replacement of the cylindrical surface) is the penetration line to be obtained. FIG. 20 shows the result of the calculation of the crossing line.

Further, FIG. 21 shows a solidified structure including the ribs defined in FIG. However, the joint portion between the rib and the shaft is filleted as a reinforcement for strength.

As described above, also in this embodiment, by using the assembly structure in the mechanical parts design support system, the case parts supporting the shutter unit can be designed in a short period of time, which is the same as the first embodiment. The effect of is obtained.

The present invention is not limited to the above-described embodiments, and various modifications can be carried out without departing from the scope of the invention. For example, the methods described in the embodiments are recorded as programs that can be executed by a computer, such as magnetic disks (floppy (registered trademark) disks, hard disks, etc.), optical disks (CD-ROM, DVD, etc.), semiconductor memories, etc. It is also possible to write it on a medium and apply it to various devices, or to transmit it via a communication medium and apply it to various devices. A computer that realizes the present invention may be any computer that reads a program recorded in a recording medium and controls the operation by the program to execute the above-described processing.

The present invention is not limited to the above-mentioned embodiment and can be implemented by variously modifying.

[0077]

As described above, according to the present invention,
By using the assembly structure that expresses the upper and lower relationships of assembly objects and the layout relationship between assembly objects, the information of the mechanical parts is centrally managed by the assembly structure, and the mechanism plan based on the skeleton model when selecting the mechanism plan Generation,
Supports consistent mechanical component design, from mechanical operation simulation to mechanical operation simulation in which a part (or all) of the two-dimensional shape is determined, automatic generation of three-dimensional shape and mechanical operation simulation in three-dimensional shape be able to. Therefore, the present invention is a CAD of various mechanical parts.
It is extremely effective for design.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of a mechanical component design support system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an object view and a lever displayed on a canvas.

FIG. 3 is a diagram showing an example of a shutter unit.

FIG. 4 is a diagram showing an example of a shutter unit in a skeleton model.

FIG. 5 is a diagram showing an assembly structure of a shutter unit.

FIG. 6 is a shutter lever 2 of the shutter unit.
Diagram showing an example of dimensional shape definition

FIG. 7 is a shutter lever 2 of the shutter unit.
Diagram showing an example of dimensional shape definition

FIG. 8 is a diagram showing an example in which each surface of a shutter lever is moved in parallel.

FIG. 9 is a diagram showing a solid model of a shutter lever.

FIG. 10 is a diagram showing a solid model of a shutter unit.

FIG. 11 is a diagram showing an overall operation flow when the first embodiment is applied to the design of a shutter unit.

FIG. 12 is a diagram showing a more detailed operation flow of part A in FIG.

FIG. 13 is a diagram showing a more detailed operation flow of part B in FIG.

FIG. 14 is a view for explaining the second embodiment of the present invention, showing a case part before defining a hole for mounting a plunger.

FIG. 15 is a diagram showing a state in which the filled portion in FIG. 14 is projected onto a two-dimensional canvas.

FIG. 16 is a diagram showing a state in which a two-dimensional shape of a hole is defined.

FIG. 17 is a diagram showing a state in which defined holes are reflected in the original solid model.

FIG. 18 is a view showing a state before rib arrangement.

FIG. 19 is a view showing a state after rib arrangement.

FIG. 20 is a diagram showing a state in which an intersection line is obtained and the result is reflected.

FIG. 21 is a diagram showing a solidified state including the rib defined in FIG. 20.

FIG. 22 is a diagram showing steps of designing a conventional mechanical unit.

[Explanation of symbols]

10 ... GUI (Graphical User Interface) 11 ... Command 12 ... Mouse 13 ... Canvas 14 ... Object view 20 ... Parts editing system 21 ... Overall control unit 22 ... Environment setting section 23 ... Screen control unit 24 ... Pick part 25 ... Creation / Deletion / Surface Generation Unit 26 ... 3D modeler part 27 ... Correlation calculator 28 ... Redrawing section 31 ... Drawing section 32 ... Tree registration section 40 ... Data 41 ... Data management unit 42 ... Model base 43 ... Mechanism object management unit 44 ... Mechanism object library 45 ... Design Knowledge Management Department 46 ... Design knowledge base

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuharu Higuchi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Yasuyuki Nishitai 2-43 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (56) Reference JP 5-242203 (JP, A) JP 6-103345 (JP, A) JP 7-160909 (JP, A) Takashi Kojima et al., Machinery Design support system for camera lens frame unit focusing on system variability design, Journal of Information Processing Society of Japan, Japan, Information Processing Society of Japan, January 15, 1997, vol. 38 no. 1, p131-145 Masanobu Umeda et al., Knowledge representation model for technical information distribution related to standard parts, Journal of information processing disintegration, Japan, Information Processing Society of Japan, October 15, 1997, vol. 38 no. 10, p1905-1918 Tatsuharu Higuchi et al. Design language DSP (bottom), which improves the design quality by making the database of the know-how of designers, mechanical design, Japan, Nikkan Kogyo Shimbun, October 1, 1998, 42nd Volume 13, p109-117 (58) Fields investigated (Int.Cl. ⁷ , DB name) G06F 17/50 JISST file (JOIS)

Claims (4)

(57) [Claims] 1. A mechanism object library that stores knowledge for defining a plurality of mechanism parts that can be used in a skeleton model based on assembly structure information, and a mechanism plan for achieving a required purpose by the skeleton model. A verification unit that inputs and verifies the function of the skeleton model, and generates a two-dimensional shape of the mechanical part selected from the mechanical object library according to the required specifications of the mechanical plan .
The two-dimensional shape
Of the two-dimensional shape editor for optimizing the two-dimensional shape by repeating the generation and the examination, and the attributes for defining the mechanical parts output from the two-dimensional shape editor are redefined by the assembly structure. and model base for storing, and interpenetrating line calculating means for calculating a phase transmural line of output from the two-dimensional shape editor two-dimensional plane minutes, based on the assembly structure information, Karaso the two-dimensional shape
Solid model generating means for generating a three-dimensional solid model of the mechanical component by parallel movement of the planes of the two parts and a two-dimensional projection drawing generating means for generating a two-dimensional projection drawing of the generated three-dimensional solid model. The mechanical parts design support system is characterized in that the attributes of the mechanical parts are uniformly managed by the assembly structure information. 2. The mechanical component design support system according to claim 1 , further comprising a projection drawing display means for feeding back the created two-dimensional projection drawing to the two-dimensional shape editor for display. 3. The mechanical part design support system according to claim 1 , wherein the two-dimensional shape editor defines a two-dimensional shape of a mechanical part including a die drawing direction. 4. A mechanical part design support system for defining an attribute of a mechanical part by assembling structure information, inputs a skeleton model corresponding to the mechanical plan, and determines whether or not a desired action can be obtained from the mechanical plan. Verification means for verifying based on the action of the model, a mechanism object library that stores various kinds of knowledge defined in the form of the assembly structure information for each of the plurality of mechanism parts applicable to the skeleton model, and the plurality of For each of the plurality of mechanical parts applied to the skeleton model verified by the verification means, based on the design knowledge base having the design knowledge of the mechanical parts, and the mechanical object library and the design knowledge base,
A search means for searching for an optimum design plan and a two-dimensional external shape obtained as a result of the above search are generated according to the required specifications of the above-mentioned mechanism plan, and a check such as interference check is performed.
After discussions, the two-dimensional appearance shape was generated and the examination was repeated.
A two-dimensional shape editor for returning and optimizing the two-dimensional appearance shape, and attribute information given to the mechanical part output from the two-dimensional shape editor is redefined by the assembly structure information and stored. The model base and the two-dimensional surface section output from the above two-dimensional shape editor
Based on the assembly structure information, the two-dimensional appearance shape is calculated based on the assembly structure information.
The plane part is moved in parallel and the above-mentioned mechanism is
Solid model generation to generate 3D solid model of product
And the two-dimensional projection drawing of the generated three-dimensional solid model
A two-dimensional projection drawing generation means to be created and the above-mentioned two-dimensional projection drawing to the above-mentioned two-dimensional shape editor.
Further, the projection view display means for feedback to
In addition , the above-mentioned 2D shape editor is used for the 2D appearance shape of mechanical parts.
The mechanical parts design support system is characterized by defining the direction including the die cutting direction .