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A flexible design automation system for toolsets for the rotary draw bending of aluminium tubes
Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
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.

Place, publisher, year, edition, pages
2007.
Keywords [en]
Knowledge Based Engineering, Design Automation, Rotary Draw Bending
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:hj:diva-4821ISBN: 0-7918-3806-4 (print)OAI: oai:DiVA.org:hj-4821DiVA, id: diva2:35641
Available from: 2008-01-15 Created: 2008-01-15 Last updated: 2011-05-16Bibliographically approved
In thesis
1. Design Automation Systems for Production Preparation: Applied on the Rotary Draw Bending Process
Open this publication in new window or tab >>Design Automation Systems for Production Preparation: Applied on the Rotary Draw Bending Process
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
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:nbn:se:hj:diva-10673 (URN)
Presentation
(English)
Opponent
Supervisors
Available from: 2009-12-22 Created: 2009-10-19 Last updated: 2016-08-12Bibliographically approved
2. Automated Computer Systems for Manufacturability Analyses and Tooling Design: Applied to the Rotary Draw Bending Process
Open this publication in new window or tab >>Automated Computer Systems for Manufacturability Analyses and Tooling Design: Applied to the Rotary Draw Bending Process
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Automatiserade Datorsystem för Tillverkningsbarhets-analyser och Verktygskonstruktion : Tillämpat på Dragbockningsprocessen
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 processes. Design automation is a powerful tool to increase efficiency in these two processes.

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

Topics addressed in this thesis include the flexibility of design automation systems, knowledge-bases containing alternative design rules, the automation of the finite element analysis process, manufacturability analysis over several productions steps, and the determination of production limits by looping the automated manufacturability analysis process. These topics are discussed in connection with the rotary draw bending of aluminum profiles.

It is concluded that the concept of design automation can be applied to the manufacturability analysis process at different levels of automation depending on the characteristics of the implemented knowledge. The concept of object orientation should be adapted when implementing a knowledge-base and when developing the geometrical representations of the products. This makes a design automation system flexible enough to edit underlying knowledge and to extend the targeted design space. It is possible to automate the process of setting up, running, and interpreting finite element analyses to a great extent, enabling the design automation system to evaluate its own design proposals. It is also possible to enable such systems to consider sequences of manufacturing steps and loop them to develop decision support guiding engineers early in the design process, saving time and money while still assuring high product quality.

Place, publisher, year, edition, pages
Göteborg: Chalmers Reproservice, 2011. p. 82
Series
Doktorsavhandlingar vid Chalmers tekniska högskola, ISSN 0346-718X ; 3191
Keywords
Design For Manufacturability, Design Automation, Rotary Draw Bending, and Knowledge-based Engineering (KBE)
National Category
Other Engineering and Technologies not elsewhere specified Other Mechanical Engineering
Identifiers
urn:nbn:se:hj:diva-15011 (URN)978-91-7385-510-5 (ISBN)
Public defence
2011-04-29, E1405, Gjuterigatan 5, Jönköping, 10:00 (Swedish)
Opponent
Supervisors
Available from: 2011-05-16 Created: 2011-05-12 Last updated: 2012-01-09Bibliographically approved

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