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Tolerance chain design and analysis of in-process workpiece
KTH, School of Industrial Engineering and Management (ITM), Production Engineering. Scania CV AB.
Scania CV AB.
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
2013 (English)In: Proceedings of the International Conference on Advanced Manufacturing Engineering and Technologies: Vol. 2 / [ed] Andreas Archenti and Antonio Maffei, 2013, 305-315 p.Conference paper, Published paper (Refereed)
Abstract [en]

Process planning comprises a broad range of activities to define a complete process chain for the manufacturing of a product. Beside the definition of proper operations and operation sequence, the definition of in-process tolerances for multi-step machining is decisive for the possibilities to achieve a well running and economical production. This paper introduces the dimension dependency chart (DDC) as a methodology based on tolerance charting technique where the complete manufacturing process chain can be efficiently represented, analysed and developed. The DDC uses mapping matrices for the transformation of operation element behaviour to the process steps defined by the process planner and further on to the dimensions and tolerances for the final part. Two important comparisons can be done by using the DDC; the expected behaviour of the in-process steps versus the tolerances defined by the process planner and the allowed variations of the final part dimensions versus the designed product specification.

Place, publisher, year, edition, pages
2013. 305-315 p.
Keyword [en]
Process planning, tolerance chain, tolerance chart, dimension dependency chart, DDC
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:kth:diva-136758ISBN: 978-91-7501-893-5 (print)OAI: oai:DiVA.org:kth-136758DiVA: diva2:677077
Conference
NEWTECH 2013, the International Conference on Advanced Manufacturing Engineering and Technologies, Stockholm, Sweden27-30 October 2013
Funder
XPRES - Initiative for excellence in production research
Note

QC 20140522

Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2014-05-22Bibliographically 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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