Applying Universal Linking of Engineering Objects in the Automotive Industry: Practical Aspects, Benefits, and Prototypes

2002 ◽  
Author(s):  
Johann U. Zimmermann ◽  
Siegmar Haasis ◽  
Fred J. A. M. van Houten
Keyword(s):  
Process Planning ◽  
Automotive Industry ◽  
Process Chain ◽  
Technical Aspects ◽  
Software Implementations ◽  
Informational Integration

The bi-directional communication of CAD programs with subsequent applications such as process planning remains a key challenge in design-for-the-lifecycle. While it seems sensible that individual applications use their own collection of feature types and thereby allow users to have their specific perspective of the product, it is still difficult to automatically close the gap between the variety of applications. Universal Linking of Engineering Objects (ULEO) targets this concern. It is general enough to facilitate informational integration of the applications along the process chain. This paper examines a number of scenarios for exploiting ULEO’s benefits in the field of automotive development and reports on the associated prototypical software implementations. Principle alternatives and technical aspects relevant for applying ULEO are discussed in some detail beforehand.

scholarly journals Approaches to modelling the shape of nanocrystals

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Christina Boukouvala ◽  
Joshua Daniel ◽  
Emilie Ringe
Keyword(s):  
Mathematical Models ◽  
Kinetic Parameters ◽  
Crystal Shape ◽  
Wulff Construction ◽  
Technical Aspects ◽  
Crystal Shapes ◽  
Shape Models ◽  
Model Crystal ◽  
Software Implementations ◽  
Complex Crystal

AbstractUnlike in the bulk, at the nanoscale shape dictates properties. The imperative to understand and predict nanocrystal shape led to the development, over several decades, of a large number of mathematical models and, later, their software implementations. In this review, the various mathematical approaches used to model crystal shapes are first overviewed, from the century-old Wulff construction to the year-old (2020) approach to describe supported twinned nanocrystals, together with a discussion and disambiguation of the terminology. Then, the multitude of published software implementations of these Wulff-based shape models are described in detail, describing their technical aspects, advantages and limitations. Finally, a discussion of the scientific applications of shape models to either predict shape or use shape to deduce thermodynamic and/or kinetic parameters is offered, followed by a conclusion. This review provides a guide for scientists looking to model crystal shape in a field where ever-increasingly complex crystal shapes and compositions are required to fulfil the exciting promises of nanotechnology.

Control of Uncertainty in High Precision Cutting Processes: Reaming of Valve Guides in a Cylinder Head of a Combustion Engine

2015 ◽  
Vol 807 ◽  
pp. 153-161 ◽  
Author(s):  
Christian Bölling ◽  
Sebastian Güth ◽  
Eberhard Abele
Keyword(s):  
Automotive Industry ◽  
Cylinder Head ◽  
Combustion Engine ◽  
Production Costs ◽  
Process Chain ◽  
Hole Quality ◽  
Process Reliability ◽  
Cutting Edge Preparation ◽  
Cutting Processes ◽  
Edge Preparation

In production processes uncertainty has a great impact on the product quality as well as production costs. In automotive industry the reaming of valve guides in a cylinder head of a combustion engine is a quality determining process. Due to the force fitting of the valve guides into the cylinder head the final reaming process has to deal with increased uncertainty. On the other hand, the finished hole is closely tolerated. To ensure the process reliability the admissible tolerance must be strictly met even in case of uncertainty. This paper presents a possibility to achieve process reliability by a modified process chain with an additional pilot reaming tool. Thereby, the effect of different cutting edge preparation is also analyzed. Further, the influence of the pilot reamer geometry on the final hole quality is investigated.

Generative Design and CNC Fabrication Using Shape Grammars

2008 ◽  
Author(s):  
Christoph Ertelt ◽  
Kristina Shea
Keyword(s):  
Process Planning ◽  
Machine Tools ◽  
Shape Grammar ◽  
Cnc Machine Tools ◽  
Proof Of Concept ◽  
Process Chain ◽  
Shape Grammars ◽  
Cnc Machine ◽  
Generative Design ◽  
Functional Part

Generative design and fabrication refers to the ability to autonomously generate designs while simultaneously generating all information to directly fabricate them. This technique is driven by the increasing need to rapidly and flexibly fabricate customized parts and individually designed products. For the automation of the design-to-fabrication process chain, intensive and dynamically updated knowledge from the domains of design and fabrication must be provided. To allow for a flexible, autonomous fabrication, the knowledge modeled must dynamically reflect the state of the fabrication system and its capabilities. This paper presents an approach to unify knowledge for generative design and generative fabrication using shape grammars. With shape grammars, the geometry of designs and their mapping to removal volumes corresponding to fabrication processes on CNC machine tools are represented. The process instructions for fabrication are included by augmenting the removal volume shapes with labels. A new shape grammar approach to represent designs and fabrication processes is presented and validated on an example functional part as a proof-of-concept. The approach enables pushing knowledge downstream, from design and process planning directly to the fabrication system itself providing a stepping stone towards awareness of machine capabilities in fabrication systems and autonomous process planning for customized parts.

High Quality Magnesium Sheets for Automotive Applications

2005 ◽  
Vol 6-8 ◽  
pp. 665-672 ◽  
Author(s):  
Friedrich Wilhelm Bach ◽  
M. Rodman ◽  
A. Rossberg
Keyword(s):  
Automotive Industry ◽  
Metal Forming ◽  
Machine Tools ◽  
Closed Loop ◽  
Process Chain ◽  
Testing Methods ◽  
High Quality ◽  
Industrial Practice ◽  
Key Factor ◽  
Complete Process

In order to make magnesium sheets a competitive material alternative for highly sophisticated light-weight constructions the complete process chain for their production has to be investigated. In laboratory scale new alloys, casting techniques and optimized rolling and heat treatment schedules have been developed. At the Institute for Metal Forming and Metal Forming Machine Tools (IFUM) the forming capacity of magnesium sheets has been investigated. Derived from the strict quality requirements of e.g. the automotive industry, testing methods concerning mechanical properties, corrosion resistance and surface quality have been developed. It has been shown that the controlled development of a suited microstructure is the key factor for ensuring the requested product properties. Together with research and manufacturing partners the results were transferred to industrial practice and a closed loop process chain for the production of high quality magnesium sheets has been established.

ONTOLOGICAL MACHINING PROCESS DATA MODELLING FOR POWERTRAIN PRODUCTION IN EXTENDED ENTERPRISE

2005 ◽  
Vol 04 (01) ◽  
pp. 69-82 ◽  
Author(s):  
JING CAI ◽  
MICHAEL WEYRICH ◽  
ULRICH BERGER
Keyword(s):  
Process Planning ◽  
Data Exchange ◽  
Machining Process ◽  
Planning System ◽  
Process Chain ◽  
Process Data ◽  
Digital Factory ◽  
Transfer Line ◽  
Feature Technology ◽  
Machining Process Planning

As a new CAx concept, Digital Factory points out digital design of product & virtual planning of production. In this context, feature technology builds up the entire CAx process chain in Digital Factory, and facilitates STEP based engineering data generation and exchange. The collaborative computer-aided machining process planning of a transfer line is an element in process chain of extended enterprises Automotive Engineering. In practice, it is an approach engaged by both OEMs and their long-term machine suppliers. Application of a CAD-based Digital Factory planning system to design a virtual transfer line needs planning standard data and exchange with supplier. This paper highlights STEP-referenced ontological data modeling approach in the standardized data exchange for collaborative machining process planning, discusses the aspects of its prospective application advantages in machining process planning by OEMs and suppliers for Powertrain production in Automotive Industry.

scholarly journals A Modelling Approach for the Manufacturing Process Chain of Composite Lightweight Structures

2008 ◽  
Vol 43 ◽  
pp. 157-166
Author(s):  
Michael F. Zaeh ◽  
Mirko Langhorst
Keyword(s):  
Automotive Industry ◽  
Process Design ◽  
Process Chain ◽  
Lightweight Structures ◽  
Process Chains ◽  
High Residual Stress ◽  
Manufacturing Techniques ◽  
Manufacturing Process Chain ◽  
Related Process ◽  
Modelling Approach

In order to support production tasks in the automotive industry, to reduce costs due to a trial and error procedure during process design and plant construction and to secure the accuracy of frame component assemblies, modern simulation methods are applied. In production chains a row of different manufacturing techniques are established. To accompany the number of manufacturing steps with the aid of calculation methods, an interacting of each simulation with the preliminary one is necessary. Such process chains help to determine the structural properties and geometrical accuracy of components and assemblies during manufacturing of composite lightweight structures and ensure their final quality. The basic difficulty of handling aluminium composites with steel reinforcements is the high residual stress level in the reinforcing elements and the adjoining matrix. This stress state can have a significant effect on the desired machining results and the related process itself. Contemplating this reveals the importance of defining a process chain by simulation.

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