EP2100243A1 - Procede de conception assistee par ordinateur d'un ensemble mecaniqu e - Google Patents
Procede de conception assistee par ordinateur d'un ensemble mecaniqu eInfo
- Publication number
- EP2100243A1 EP2100243A1 EP07870379A EP07870379A EP2100243A1 EP 2100243 A1 EP2100243 A1 EP 2100243A1 EP 07870379 A EP07870379 A EP 07870379A EP 07870379 A EP07870379 A EP 07870379A EP 2100243 A1 EP2100243 A1 EP 2100243A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parameters
- elementary
- mechanical assembly
- skeleton
- solids
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/10—Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
Definitions
- the invention relates to the field of computer-assisted design methods, and more particularly to the methods of designing a mechanical assembly.
- Such methods generally include a step of graphically modeling the mechanical assembly.
- a mechanical assembly based on the use of a skeleton driving an assembly of elementary solids driving itself a three-dimensional graphical modeling.
- the same file contains both the parameterizable skeleton of the mechanical assembly, the elementary solids assembled together in such a way as to constitute the mechanical assembly, as well as the three-dimensional graphical modeling.
- the skeleton and elemental solids are specific, that is, they can not be separated from other elements and extracted from the common file, or at least not easily.
- a disadvantage of this prior art is to have a design time that is generally too long, since from a given mechanical assembly to another distinct given mechanical unit, the two mechanical assemblies fulfilling the same function, it is necessary to start all over again, generally first of all at the level of the skeleton, then possibly at the level of the assembly of the elementary solids and if necessary at the level of the elementary solids themselves.
- This possibility of easily reusing the skeleton of a given mechanical assembly with another distinct given mechanical assembly allows, on a large number of different mechanical assemblies fulfilling the same function, to reduce the design time very substantially.
- the invention proposes a computer-assisted design method for a mechanical assembly, in which at least the elementary solids are rendered generic and stored in a separate file from that of the graphical modeling or in several files but all distinct from the file of the graphical modeling, so as to be able to be reused from one given mechanical unit to another distinct given mechanical unit , provided that the two mechanical assemblies fulfill the same function, while remaining related to the graphical modeling so that the graphical modeling remains controllable, by the elementary solids, that the elementary solids themselves are controlled directly or indirectly.
- the steering is indirect, which is the most common, it can be for example through a skeleton or through another element to determine the presence and relative position of at least some elemental solids between them .
- a computer-assisted design method comprising at least one step of graphical modeling of the three-dimensional mechanical assembly and controllable by several elementary solids which are parameterizable by the user, at least geometrically, independently of each other, an elementary solid comprising a geometrically configurable construction, by a user, at least geometrically, and representing a part part or the removal of a part part, a part being a structure all parts of which are motionless relative to each other; characterized in that the parameterizable geometrical constructions of the elementary solids are generic for several mechanical assemblies which are distinct from one another and fulfill the same function, the parameterization of said constructions being able to differ from one mechanical assembly to another, and in that the elementary solids on the one hand and graphic modeling on the other hand are stored in separate files and linked together so that said graphic modeling remains controllable by said elementary solids so that the reuse of said generic geometric constructions is facilitated for the user.
- the graphic modeling file advantageously contains neither parameters resulting from constraints imposed by the environment of the mechanical assembly, nor parameters resulting from constraints imposed by the operation of the mechanical assembly, nor parameters derived from constraints imposed by the manufacturing process. of the mechanical assembly. All these parameters are then integrated upstream of the graphic modeling in the design. From a given mechanical set to another distinct given mechanical set but fulfilling the same function, all the constraints or almost all the constraints are integrated upstream of the graphic modeling, which greatly simplifies the manipulation of the graphic modeling, in particular when successive iterations in the design process.
- the elementary solids of the group are advantageously respectively volume elements. At this stage usually downstream of the design process, it is interesting that the precise volume form of the different parts of the mechanical assembly is integrated.
- a plurality of elementary solids respectively represent part parts and several other elementary solids respectively represent part part withdrawals.
- elementary solids can account for all volume variations, positive elementary solids bringing material corresponding to part parts, negative elementary solids removing material corresponding to most part machining phases. often.
- certain geometric parameters of at least some elementary solids are controlled by geometric parameters of a skeleton while no parameter geometric skeleton is driven by the geometric parameters of elemental solids.
- the skeleton may be preferentially displayed in the form of a set of points and / or lines and / or planes, excluding volumes.
- At least one elementary solid comprises one or more relations representative of dependency links between parameters within this same elemental solid.
- a further downstream level in the design process it is thus possible to take into account interactions between parameters that are more localized, ie at a part-part level or at a phase-level. machining for example.
- the parameters of the elementary solids there are parameters derived from constraints imposed by the manufacturing process of the mechanical assembly. Indeed, it is interesting to integrate these parameters into a downstream phase of the design.
- the parameters of the elementary solids resulting from constraints imposed by the manufacturing process of the mechanical assembly advantageously constitute the majority of all the parameters resulting from constraints imposed by the manufacturing process of the mechanical assembly.
- parameters of the elementary solids there are parameters resulting from constraints imposed by the environment of the mechanical assembly.
- parameters resulting from constraints imposed by the operation of the mechanical assembly there are parameters resulting from constraints imposed by the mechanical assembly.
- At least one assembly of elementary solids is structured in the form of an assembly of functional slices, a functional slice being itself an assembly of elementary solids.
- This hierarchical way of assembling the elementary solids is particularly interesting in the case of very complex mechanical assembly, such as for example a cylinder head motor vehicle land.
- the order of assembly of the elementary solids preferentially reflects the scheduling of the steps of the manufacturing process of the part or parts of the mechanical assembly.
- the mechanical assembly belongs to a land motor vehicle.
- the elementary solids are driven by a skeleton.
- the computer-aided design method of a mechanical assembly comprises at least one step of graphical modeling of the three-dimensional mechanical assembly that can be controlled by a skeleton that comprises a parametric geometric construction by a user.
- the parameterizable geometrical construction of the skeleton is generic for several mechanical assemblies which are distinct from one another and fulfill the same function, the parameterization of said construction being able to differ from one mechanical assembly to another, and the skeleton and the graphic modeling are stored in files distinct and interrelated so that said graphic modeling remains controllable by said skeleton so that the reuse of said generic geometric construction is facilitated for the user.
- the backbone preferentially comprises one or more relationships representative of dependency links between parameters. This makes it possible to better take into account the interdependence of the parameters, even at this upstream level of the design.
- the skeleton is preferably made from a dependency graph that orders the parameters between them using dependency links between parameters and which is common to all the mechanical assemblies fulfilling the same function. In this way, one can obtain a relatively simple skeleton while retaining generic.
- the skeleton obtained, although simple, can be used for a large number of distinct mechanical sets although fulfilling the same function.
- the scheduling of the parameters in the dependency graph advantageously reflects the scheduling of the design steps of the mechanical assembly. The more these two orders are similar, the more the skeleton will achieve a good compromise between simplicity and genericity.
- the skeleton exists for at least one component, a component being a group of parts arranged so that if one of the parts is modified in its position or in its structure the position as the structure of the other parts of the component can be modified .
- the skeleton at the component level ensures good genericity over time. Indeed, it is relatively rare that the structure of a component is completely upset. On the other hand, preferably, there is no skeleton for any part. Indeed, it is relatively relatively more frequent that the structure of a room is completely upset.
- FIG. 1 shows schematically an example of dependency graph for a pulley according to a preferred embodiment of the invention
- FIG. 2 shows schematically an example of a skeleton for a pulley according to a preferred embodiment of the invention
- FIG. 3 diagrammatically represents an example of assembly of elementary solids for a pulley according to a preferred embodiment of the invention
- FIG. 4 shows schematically an example of non-parametric graphical modeling of a pulley according to a preferred embodiment of the invention.
- the chosen part is the pulley AVT which is a piece located at the end of the crankshaft in a shaft line of a motor vehicle engine.
- the first function of the AVT pulley is to allow belt drive of the engine accessories, including the alternator and the compressor.
- the second function of the AVT pulley is to limit motor acyclism.
- the AVT pulley is divided into three concentric parts, successively arranged along the radius of the pulley, from the center to the periphery: the hub which is the central part fixed on the crankshaft, the rubber which is the intermediate part arranged around the hub , the dynamic mixer which is the peripheral part arranged around the rubber and on which is wound the belt.
- the hub which is the central part fixed on the crankshaft
- the rubber which is the intermediate part arranged around the hub
- the dynamic mixer which is the peripheral part arranged around the rubber and on which is wound the belt.
- FIG. 1 schematically represents an example of dependency graph for a pulley according to a preferred embodiment of the invention.
- the SQ skeleton layer has only two parameters, the LEP shoulder width and the LPO pulley width.
- the layer of elementary solids on the other hand, has more numerous parameters. Of these, some basic solids relate to the MO hub, others to the CA rubber and still others to the BA beater.
- the internal diameter D1 the set DAC comprising the diameter and the angle of the chamfer of the contact with the distribution pinion, the shoulder diameter DEP, the keyway width LC, the PG assembly comprising throat parameters such as the depth, the lower diameter, the upper diameter and the chamfer angle, the set PP comprising the pocket parameters, the outer diameter of the hub DEM.
- the thickness of the EC rubber can be noted.
- the parameters relating to the beater BA it is possible to note the outside diameter of the beater DEB, the set PBB comprising the drummer stop parameters, the number of teeth of the beater NDB.
- Parameters outside the pulley affect the parameters of the pulley which are therefore dependent on these external parameters.
- these external parameters some belong to the family P10 of the parameters resulting from constraints imposed by the environment of the pulley, others belong to the family P20 of the parameters resulting from constraints imposed by the process of manufacture of the pulley, and of still others belong to the P30 family of parameters derived from constraints imposed by the operation of the pulley.
- the family P10 parameters resulting from constraints imposed by the environment of the pulley there is in particular the parameter P1 1 from the crankshaft, the parameter P12 from the sprocket.
- FIG. 2 schematically shows an example of a skeleton for a pulley according to a preferred embodiment of the invention.
- the skeleton comprises an axis, the axis of the crankshaft, on which are represented three planes, the plane PLPO which is the plane of width of the pulley, the plane RP which is the reference plane of the pulley, the plane PPC which is the plane of passage of the key.
- the distance between the PLPO plane and the PPC plane represents the LPO width parameter of the pulley.
- the distance between the RP plane and the CPAP plane represents the LEP width parameter of the shoulder.
- the skeleton is common to all AVT pulleys of different vehicles, only its setting can vary from one AVT pulley to another.
- the skeleton with its parameters and the graphic modeling are stored in separate files between them but which remain linked so that the graphic modeling remains controllable by the skeleton.
- FIG. 3 schematically represents an example of assembly of elementary solids for a pulley according to a preferred embodiment of the invention.
- Three elementary solids correspond to part parts, these are the hub MO, the rubber CA, the dynamic beater BA.
- Four elementary solids correspond to room part withdrawals, these are the proximity cutout of the DPCD distribution casing, the stop cutout of the dynamic mixer DBBD, the passage of the after-sales tooling POAV, the keyway which is not not shown here because it applies to the non-visible face of the pulley.
- the set of usable elementary solids is common to all AVT pulleys of different vehicles, the choice of certain elementary solids, how to assemble them, and their parameterization that can vary from one AVT pulley to another.
- the elementary solids with their parameters on the one hand and the graphical modeling on the other hand are stored in separate files between them but which remain linked in such a way that the graphic modeling remains controllable by the elementary solids.
- the non-parametric graphical modeling remains controllable by the elementary solids themselves controllable by the skeleton.
- the skeleton with its parameters on the one hand and the elementary solids with their parameters on the other hand are stored in separate files between them but which remain linked together so that the elementary solids remain controllable by the skeleton. More precisely, it is the parametric skeleton that drives the assembly of parametric elementary solids that drives the non-parametric graphical modeling.
- FIG. 4 schematically represents an example of non-parametric graphical modeling of a pulley according to a preferred embodiment of the invention.
- the dynamic beater BA is still recognizable after machining, obtained by the assembly of the solid elementary dynamic beater BA, the elementary solid cutting of proximity of the distribution casing DPCD, and the basic solid stop cutting of the dynamic beater DBBD.
- the graphical modeling of an AVT pulley is unique for a given AVT pulley; a different AVT pulley will have a different graphical modeling.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Geometry (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Computer Graphics (AREA)
- Software Systems (AREA)
- Automatic Assembly (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0654609A FR2907938B1 (fr) | 2006-10-27 | 2006-10-27 | Procede de conception assistee par ordinateur d'un ensemble mecanique. |
PCT/FR2007/052207 WO2008071889A1 (fr) | 2006-10-27 | 2007-10-19 | Procede de conception assistee par ordinateur d'un ensemble mecaniqu e |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2100243A1 true EP2100243A1 (fr) | 2009-09-16 |
Family
ID=38050974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07870379A Withdrawn EP2100243A1 (fr) | 2006-10-27 | 2007-10-19 | Procede de conception assistee par ordinateur d'un ensemble mecaniqu e |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100070242A1 (fr) |
EP (1) | EP2100243A1 (fr) |
JP (1) | JP5148620B2 (fr) |
CN (1) | CN101529428B (fr) |
BR (1) | BRPI0715038A2 (fr) |
FR (1) | FR2907938B1 (fr) |
WO (1) | WO2008071889A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8312420B1 (en) * | 2005-11-18 | 2012-11-13 | The Mathworks, Inc. | System and method for performing structural templatization |
CN103093066A (zh) * | 2013-02-23 | 2013-05-08 | 盐城工学院 | 柴油机曲轴三维几何形状建模方法 |
JP2015075912A (ja) * | 2013-10-09 | 2015-04-20 | ソニー株式会社 | 操作機構および撮像装置 |
CN116720285B (zh) * | 2023-08-07 | 2024-01-02 | 上海索辰信息科技股份有限公司 | 一种复杂壳体结构的参数化设计方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4912657A (en) * | 1986-10-30 | 1990-03-27 | Synthesis, Inc. | Method and systems for generating parametric designs |
DE4231117A1 (de) * | 1992-09-17 | 1994-03-24 | Thomson Brandt Gmbh | Verfahren zur Aufzeichnung und Wiedergabe von Daten |
US5819062A (en) * | 1994-12-05 | 1998-10-06 | Motorola Inc. | Method for converting design intent into a neutral-file-format for computer aided design applications |
US6768928B1 (en) * | 1999-05-20 | 2004-07-27 | Olympus Optical Co., Ltd. | Mechanism component design support system |
US6477517B1 (en) * | 2000-01-20 | 2002-11-05 | Visteon Global Technologies, Inc. | Method of knowledge-based engineering design of an instrument panel |
US7295958B1 (en) * | 2002-06-04 | 2007-11-13 | Massachusetts Institute Of Technology | Method and system for computer aided design |
CN100483426C (zh) * | 2005-05-28 | 2009-04-29 | 吉林大学 | 基于cad模型的离散元法边界建模方法 |
-
2006
- 2006-10-27 FR FR0654609A patent/FR2907938B1/fr not_active Expired - Fee Related
-
2007
- 2007-10-19 US US12/447,436 patent/US20100070242A1/en not_active Abandoned
- 2007-10-19 WO PCT/FR2007/052207 patent/WO2008071889A1/fr active Application Filing
- 2007-10-19 BR BRPI0715038-5A patent/BRPI0715038A2/pt not_active IP Right Cessation
- 2007-10-19 CN CN2007800400426A patent/CN101529428B/zh not_active Expired - Fee Related
- 2007-10-19 JP JP2009533911A patent/JP5148620B2/ja not_active Expired - Fee Related
- 2007-10-19 EP EP07870379A patent/EP2100243A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2008071889A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101529428B (zh) | 2011-08-10 |
JP5148620B2 (ja) | 2013-02-20 |
FR2907938A1 (fr) | 2008-05-02 |
BRPI0715038A2 (pt) | 2013-05-28 |
CN101529428A (zh) | 2009-09-09 |
US20100070242A1 (en) | 2010-03-18 |
WO2008071889A1 (fr) | 2008-06-19 |
FR2907938B1 (fr) | 2008-12-19 |
JP2010507853A (ja) | 2010-03-11 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20090304 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: COLOMBEL, HERVE Inventor name: MAUPETIT, ARNAUD Inventor name: RENAULT, CYRIL |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20100331 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20140501 |