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Design Automation Systems for Production Preparation: Applied on the Rotary Draw Bending Process
Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design. (Produktutveckling)ORCID iD: 0000-0003-1162-724X
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Intensive competition on the global market puts great pressure on manufacturing companies to develop and produce products that meet requirements from customers and investors. One key factor in meeting these requirements is the efficiency of the product development and the production preparation process. Design automation is a powerful tool to increase efficiency in these two processes.

The benefits of automating the production preparation process are shortened led-time, improved product performance, and ultimately decreased cost. Further, automation is beneficial as it increases the ability to adapt products to new product specifications with production preparations done in few or in a single step. During the automation process, knowledge about the production preparation process is collected and stored in central systems, thus allowing full control over the design of production equipments.

Three main topics are addressed in this thesis: the flexibility of design automation systems, knowledge bases containing conflicting rules, and the automation of the finite element analysis process. These three topics are discussed in connection with the production preparation process of rotary draw bending.

One conclusion drawn from the research is that it is possible to apply the concept of design automation to the production preparation process at different levels of automation depending on characteristics of the implemented knowledge. In order to make design automation systems as flexible as possible, the concept of object orientation should be adapted when building the knowledge base and when building the products geometrical representations. It is possible to automate the process of setting up, running, and interpreting finite element analyses to a great extent and making the automated finite element analysis process a part of the global design automation system.

Place, publisher, year, edition, pages
Göteborg: Chalmers , 2008. , p. 74
Series
Research Series from Chalmers University of Technology Department of Product and Production Development, ISSN 1652-9243 ; 33
Keywords [en]
Design automation, Rotary draw bending, Knowledge Based Engineering (KBE), and Finite Element Analysis (FEA)
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:hj:diva-10673OAI: oai:DiVA.org:hj-10673DiVA, id: diva2:272959
Presentation
(English)
Opponent
Supervisors
Available from: 2009-12-22 Created: 2009-10-19 Last updated: 2016-08-12Bibliographically approved
List of papers
1. Manufacturability Analysis Using Integrated KBE, CAD and FEM
Open this publication in new window or tab >>Manufacturability Analysis Using Integrated KBE, CAD and FEM
2008 (English)Conference paper, Published paper (Refereed)
Keywords
Production Preparation, FEM, Draw Bending
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:hj:diva-6606 (URN)
Conference
ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (IDETC/CIE 2008)
Available from: 2008-12-11 Created: 2008-10-23 Last updated: 2015-12-09Bibliographically approved
2. A flexible design automation system for toolsets for the rotary draw bending of aluminium tubes
Open this publication in new window or tab >>A flexible design automation system for toolsets for the rotary draw bending of aluminium tubes
2007 (English)In: 2007 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference: 12th Design for Manufacturing and the Life Cycle Conference (DFMLC), 2007Conference paper, Published paper (Refereed)
Abstract [en]

For parts suppliers in the manufacturing industry, the process of preliminary production preparation and the subsequent calculation of offers are critical business activities. A vital part of production preparation is the design of fixtures and tooling necessary for many processes of metal forming. In order for a company to give quick responses to customer enquiries or changes in prior specifications, it would be highly beneficial with a degree of automation in this design process. This implies the development of a computer based system able to capture existing design procedures and associated knowledge for the classes of tooling required for the forming process.

In this work, an implementation for the rotary draw bending of aluminum tubing has been done to exemplify how to develop an automated design system. The system is based on heuristic knowledge developed over many years of practical experience, knowledge analytically derived from fundamental theory found in scientific literature, and rules based on empirical data from trial manufacturing. The system applies knowledge to a given specification that a skilled engineer otherwise would do manually. The system output can be used to evaluate whether a tube is producible.

The main idea behind the system is to use knowledge objects containing information on inputs, outputs, constraints and what software are used to implement the knowledge pieces. This approach makes the system highly flexible and allows for multiple types of knowledge that might overlap. When an offering calculation is wanted, the system is set to run applicable knowledge objects for presented input data. Other objects are run when an accurate calculation for detailing is wanted for a more detailed set of input data. The system is built on readily available commercial software packages connected with a simple Visual Basic .Net program.

When building a system of this kind, it is essential that the knowledge documentation and structure be such that the functions of the system can be easily understood by the users of the system and by future developers. Aspects of user friendliness, transparency and scalability are addressed in the summary of this paper.

Keywords
Knowledge Based Engineering, Design Automation, Rotary Draw Bending
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:hj:diva-4821 (URN)0-7918-3806-4 (ISBN)
Available from: 2008-01-15 Created: 2008-01-15 Last updated: 2011-05-16Bibliographically approved
3. Automated design of rotary draw bending tools: an approach based on generic CAD-models driven by heuristic and algorithmic knowledge
Open this publication in new window or tab >>Automated design of rotary draw bending tools: an approach based on generic CAD-models driven by heuristic and algorithmic knowledge
2006 (English)In: International conference on efficient development of manufacturing machines and processes, 2006, Wroclaw, Poland, 2006Conference paper, Published paper (Refereed)
Abstract [en]

For parts suppliers in the manufacturing industry the process of preliminary production preparation and subsequent calculation of offers are critical business activities. A vital part of production preparation is the design of fixtures and tooling necessary for many processes of metal forming. For a company to give quick responses to customer enquiries, or changes in prior specifications, it would be highly beneficial with a degree of automation in this design process. This implies the development of a computer based system able to capture existing design procedures and associated knowledge for the classes of tooling required for the forming process.

In this work we exemplify an automated design system for tooling by an implementation for rotary draw bending of aluminium tubing. The system is based on established design practice and heuristic knowledge developed over many years of practical experience. The system will evaluate whether a given specification is producible with existing materials and equipment, select suitable machine, determine process parameters and determine type and dimensions of components of form die, clamp die, follower or pressure die, wiper and mandrel. The system is built on readily available commercial software packages. When building a system of this kind it is essential that the knowledge documentation and structure is such that the functions of the system can be easily understood by the users of the system and by future developers. Aspects of user friendliness, transparency and scalability are addressed in the summary of this paper.

Keywords
Design Automation, Rotary Draw Bending, Knowledge acquisition, CATIA V5
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:hj:diva-4804 (URN)
Available from: 2007-12-13 Created: 2007-12-13 Last updated: 2011-05-16Bibliographically approved

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