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Process chain based workpiece variation simulation for performance utilisation analysis
KTH, School of Industrial Engineering and Management (ITM), Production Engineering. Scania CV AB.
Scania CV AB.ORCID iD: 0000-0002-8243-9505
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
2014 (English)In: Proceedings of The 6th International Swedish Production Symposium 2014, Chalmers university , 2014Conference paper, Published paper (Other academic)
Abstract [en]

Propagation of shape variations in multi-step manufacturing processes, constrained by tolerance chains, is the consequence of sequenced operations defined in process planning. A key task in process planning is to define in-process workpiece (IPW) tolerances for efficient production ensuring conformance to the product design specification and good utilisation of the manufacturing resources. A dimension dependency chart has been developed for analysis of linked IPW tolerance chains and simulation of shape variation propagation caused by systematic and random errors. The results show how the traditional process capability index, used as an acceptance criterion for IPW tolerancing, limits the process performance utilisation.

Place, publisher, year, edition, pages
Chalmers university , 2014.
Keyword [en]
Process planning, machining, tolerance chain, process capability index, dimension dependency chart
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Production Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145549ISBN: 978-91-980974-1-2 (print)OAI: oai:DiVA.org:kth-145549DiVA: diva2:718712
Conference
The 6th International Swedish Production Symposium 2014, Gothenburg,September 16-18 2014
Funder
XPRES - Initiative for excellence in production research
Note

QC 20150218

Available from: 2014-05-22 Created: 2014-05-22 Last updated: 2015-02-18Bibliographically approved
In thesis
1. Process planning for precision manufacturing: An approach based on methodological studies
Open this publication in new window or tab >>Process planning for precision manufacturing: An approach based on methodological studies
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Process planning is a task comprising a broad range of activities to design and develop an appropriate manufacturing process for producing a part. Interpretation of the part design, selection of manufacturing processes, definition of operations, operation sequences, machining datums, geometrical dimensions and tolerances are some common activities associated with the task. Process planning is also “the link between product design and manufacturing” with the supplementary commission to support design of competitive products.

Process planning is of a complex and dynamic nature, often managed by a skilled person with few, or no, explicit methods to solve the task. The work is heuristic and the result is depending on personal experiences and decisions. Since decades, there have been plenty of attempts to develop systems for computer-aided process planning (CAPP). CAPP is still awaiting its breakthrough and one reason is the gap between the functionality of the CAPP systems and the industrial process planning practice.

This thesis has an all-embracing aim of finding methods that cover essential activities for process planning, including abilities to predict the outcome of a proposed manufacturing process. This is realised by gathering supporting methods suitable to manage both qualitative and quantitative characterisation and analyses of a manufacturing process.

The production research community has requested systematisation and deeper understanding of industrial process planning. This thesis contributes with a flow chart describing the process planning process (PPP), in consequence of the methodological studies. The flow chart includes process planning activities and information flows between these activities.

The research has been performed in an industrial environment for high volume manufacturing of gear parts. Though gear manufacturing has many distinctive features, the methods and results presented in this thesis are generally applicable to precision manufacturing of many kinds of mechanical parts.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiii, 72 p.
Series
TRITA-IIP, ISSN 1650-1888 ; 14:04
Keyword
Process planning, precision manufacturing, machining, tolerance chain analysis, process behaviour, process performance, process capability, in-process workpiece.
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Production Engineering
Identifiers
urn:nbn:se:kth:diva-145433 (URN)978-91-7595-172-0 (ISBN)
Public defence
2014-06-10, Sal M311, Brinellvägen 68, KTH, Stockholm, 13:00 (Swedish)
Opponent
Supervisors
Funder
XPRES - Initiative for excellence in production research
Note

QC 20140522

Available from: 2014-05-22 Created: 2014-05-20 Last updated: 2015-10-16Bibliographically approved

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Hedlind, Mikael

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