EP1334447A2 - Procede de conception d'un composant et composant d'un systeme d'essuyage - Google Patents

Procede de conception d'un composant et composant d'un systeme d'essuyage

Info

Publication number
EP1334447A2
EP1334447A2 EP01980180A EP01980180A EP1334447A2 EP 1334447 A2 EP1334447 A2 EP 1334447A2 EP 01980180 A EP01980180 A EP 01980180A EP 01980180 A EP01980180 A EP 01980180A EP 1334447 A2 EP1334447 A2 EP 1334447A2
Authority
EP
European Patent Office
Prior art keywords
component
model
wiper
optimization
wiper system
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Withdrawn
Application number
EP01980180A
Other languages
German (de)
English (en)
Inventor
Joachim Zimmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1334447A2 publication Critical patent/EP1334447A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design

Definitions

  • the present invention relates to a method for constructing a component.
  • the present invention further relates to a wiper system component for the wiper system of a motor vehicle.
  • the construction of geometrically complex components is currently mainly carried out with the help of CAD systems. With the help of these systems, the components are generated as SD models.
  • the 3D models are checked using the finite element method.
  • the basic idea of the finite element method is to subdivide bodies of any shape into a finite number of elements / to describe their mechanical behavior. Due to their simpler shape, the finite number of elements can be viewed ideally with regard to their mechanical behavior. From the behavior of all individual elements, taking into account the compatibility with the element transitioner, its statement about the overall mechanical behavior of the body. A continuous problem is thus converted into a discrete problem and approximately solved. As the degree of discretization increases, the approximate solution approaches the exact solution.
  • a structured procedure like that of the finite element method can be used. Taking geometric and physical specifications into account, the general procedure for solving elastic continuum problems is as follows:
  • the 3D model is modified, that is to say the model is reinforced in the critical areas and the cross section and / or the wall thicknesses can be reduced in the areas of low load.
  • This reduction in the cross section and / or the wall thickness enables material to be saved and furthermore results in a lower weight, which is desirable in many cases, for example to reduce costs.
  • the design space consists of the installation space available for the component to be created. Taking into account boundary conditions (for example for fastening points) and occurring load cases (force application and / or attacking moments), the highly stressed and the less stressed areas of the component are determined in step b). Those areas that do not contribute to the rigidity of the component "are hidden.
  • the 3D construction method according to step c) is only applied to the already structure-optimized model.
  • the step a) the following Sectionschrit ⁇ te comprising:
  • the component material defined in step a1) is an aluminum foam material.
  • aluminum foam materials are produced by mixing aluminum powder and powdered blowing agents and by carrying out a compression. When the compressed mixture is subsequently heated, the blowing agents split off gas bubbles which penetrate the metal and produce a pore structure.
  • Components that are produced using the manufacturing process of foaming aluminum materials are characterized by material accumulations. Therefore, they are ideal for the implementation of structure-optimized models, as will be explained in more detail later.
  • the component material parameters taken into account in step a2) preferably include at least the elastic modulus and / or the transverse contraction number.
  • the modulus of elasticity and the transverse contraction number are obtained via Hooke's law, which states that stress and strain are proportional to one another.
  • the modulus of elasticity is the ratio of the required tension to the relative change in length achieved, that is to say the elongation.
  • the transverse contraction number also known as the Poisso number, is a measure of how the transverse cut the material in the event of distortion.
  • step b) comprises the following substeps:
  • the topology optimization serves to find the actual structure, while the shape optimization then carried introduced so-called is used to smooth the ge ⁇ fundene structure or the geometry found, whereby it can be usually lowered the stress level.
  • a harmonic geometry can thus be created. If the component is, for example, a tool shape, a harmonic geometry has a positive effect on the subsequent filling of the tool shape.
  • step c) 3UR generation of the 3D Modell3 is used as a per se known CAD process in step c) ⁇ preference. If carried out, the production of a component comprises on the basis of the 3E model according to step d) preferably foaming an aluminum material in the manner already explained.
  • the structure-optimized model generated by step b) is in the form of data indicating at least one point cloud
  • the 3D model generated in step c) is generated on the basis of the data indicating the at least one point cloud
  • the 3D model is a surface model or a solid model.
  • component produced d may, for example, be a 'tool, in particular a mold.
  • a wiper console, a wiper bearing housing, a wiper arm mounting part or a wiper motor gear housing can be considered as an isch system component.
  • Figure 1 is a perspective view of the underside of a die casting console for a wiper system according to the prior art
  • Figure 2 is a perspective view of the top of the die casting console for a wiper system according to Figure 1;
  • FIG. 3 shows a perspective illustration of a design space model for a console for a wiper system
  • FIG. 4 shows a structure-optimized console for a wiper system which was obtained with the aid of the design space model s from FIG. 3;
  • FIG. 5 shows a cross-sectional view of a die-cast component
  • 6 is a cross-sectional view of a foamed component
  • FIG. 7 shows an example of a tool production from a structure-optimized component.
  • Figure 1 shows a perspective view of the underside of a die-cast console for a wiper system according to the prior art.
  • the die-cast console shown in FIG. 1 for a wiper system has, in addition to several openings 10, a multiplicity of webs 11 which are provided for stiffening the die-cast console.
  • the webs 11 are provided in different areas of the die-casting console with a different density, the density being higher in more heavily loaded areas.
  • stiffening webs 11 is preferred over an overall greater wall thickness in order to keep the material requirements as low as possible and not to unnecessarily increase the mass of the component.
  • FIG. 2 shows a perspective illustration of the upper side of the die-casting console for a wiper system according to FIG. 1. Raising the openings 10 shows two groove-like depressions 12 in FIG.
  • FIG. 3 shows a perspective illustration of a room model for a console for a wiper system, as is produced by method step a).
  • the design space approach is based on the space available for the component.
  • the design space model is provided as a solid model, that is to say the soaping webs 11 provided in the prior art are at least partially, preferably completely, omitted.
  • a harmonious change in the material thickness is preferred, insofar as the installation space and possibly other boundary conditions allow this.
  • the design space model shown in FIG. 3 also has openings 10 which correspond to the openings 10 in the prior art shown in FIGS. 1 and 2.
  • the breakthroughs 10 represent boundary conditions for the construction of the design space model, as well as the load cases to be expected, that is to say force application and / or attacking moments.
  • FIG. 4 shows a structure-optimized console for a wiper system which was obtained with the aid of the design space model from FIG. 3, in that a structure optimization method based on the finite element method was applied to the design space model.
  • Such openings 16 can generally be provided in areas of the component that are hardly or not at all loaded. This enables them to clearly savings can be achieved, through which the manufacturing costs can be reduced and through which the mass of the component can be reduced.
  • step b) was divided into the sub-steps of performing a topology optimization and performing a shape optimization.
  • r w as the actual structure by the optimization Topologieopti- found and the shape optimization was used to smooth the geometry found. In many cases, such a smoothing can lower the voltage level.
  • the structure-optimized model shown in FIG. 4 is generally available in the form of data that indicate one or more point clouds. These data are particularly suitable for the subsequent intended use of a 3D construction method, for example a CAD method. It is a major difference from the state of the art that the SD construction method is only applied to the already structure-optimized model.
  • FIG. 5 shows a cross-sectional view of a die-cast component.
  • FIG. 6 shows a cross-sectional view of a foamed component.
  • a comparison of FIGS. 5 and 6 shows that instead of the webs 11 provided in the prior art, the overall cross-section of the component produced by the method according to the invention has a harmonious geometry.
  • the cross-sectional area of the 5 component is larger than the cross-sectional area of the component shown in FIG. 5, "the mass is not increased by the use of foamed materials, in particular aluminum foam materials. In many cases it is even possible to reduce the mass of the component compared to components known from known Processes were made.
  • FIG. 7 shows an example of a tool production from a structure-optimized component.
  • the upper half of the tool is designated 13, while the lower half of the tool is designated 14.
  • the console for wiper systems is provided with the reference number 15 in FIG. FIG. 7 shows that an overall harmonic geometry was created by the shape optimization, which facilitates the subsequent filling of the tool shape, the tool being formed by the upper tool half 13 and the lower tool half 14.
  • the structure optimization method provided according to the invention is used in connection with foamed materials such as aluminum shielding materials, the similarity of the geometry obtained by the optimization method and the geometry required for the manufacturing method can be used advantageously and both with regard to the components and the tools a reduction in costs can be achieved, a further advantage being the reduction in mass or weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)

Abstract

L'invention concerne un procédé de conception d'un composant. Selon l'invention, le procédé consiste: (a) à concevoir un modèle spatial; (b) à soumettre ce modèle spatial à un procédé d'optimisation de structure basé sur les processus d'éléments finis pour obtenir un modèle de structure optimisée; et à soumettre le modèle de structure optimisée à un procédé de conception 3D pour produire un modèle 3D.
EP01980180A 2000-10-27 2001-09-20 Procede de conception d'un composant et composant d'un systeme d'essuyage Withdrawn EP1334447A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10053299 2000-10-27
DE10053299A DE10053299A1 (de) 2000-10-27 2000-10-27 Verfahren zur Konstruktion eines Bauteils und Wischanlagenbauteil
PCT/DE2001/003622 WO2002035476A2 (fr) 2000-10-27 2001-09-20 Procede de conception d'un composant et composant d'un systeme d'essuyage

Publications (1)

Publication Number Publication Date
EP1334447A2 true EP1334447A2 (fr) 2003-08-13

Family

ID=7661263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980180A Withdrawn EP1334447A2 (fr) 2000-10-27 2001-09-20 Procede de conception d'un composant et composant d'un systeme d'essuyage

Country Status (4)

Country Link
EP (1) EP1334447A2 (fr)
AU (1) AU2002212084A1 (fr)
DE (2) DE10053299A1 (fr)
WO (1) WO2002035476A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10352080A1 (de) 2003-11-08 2005-06-02 Robert Bosch Gmbh Verfahren zur Bestimmung einer Rohform eines elastischen Bauteils
DE10356682A1 (de) 2003-11-30 2005-07-07 Stiftung Alfred-Wegener-Institut Für Polar- Und Meeresforschung Verfahren zur Ermittlung von konstruktiven Erstmodelldaten für eine technische Leichtbaustruktur
DE102006039960A1 (de) * 2006-08-25 2008-03-27 Siemens Ag Verfahren zur Optimierung von Cockpittragstrukturen
KR20100086493A (ko) * 2007-10-30 2010-07-30 바스프 에스이 구성 요소의 벽 두께를 디자인하는 방법 및 구성 요소
DE102015214750A1 (de) 2015-08-03 2017-02-09 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Form- und Topologieoptimierung eines Gussbauteils

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19806855C2 (de) * 1998-02-19 2002-06-27 Bosch Gmbh Robert Wischerträger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0235476A2 *

Also Published As

Publication number Publication date
DE10053299A1 (de) 2002-05-16
WO2002035476A3 (fr) 2003-01-03
WO2002035476A2 (fr) 2002-05-02
AU2002212084A1 (en) 2002-05-06
DE10194736D2 (de) 2004-01-08

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