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Publications (10 of 21) Show all publications
Johansson, A., Pejryd, L. & Gustavsson Christiernin, L. (2016). Consideration of market demand volatility risks, when making manufacturing system investments. Paper presented at 13th Global Conference on Sustainable Manufacturing, GCSM 2015; Binh Du'o'ng New City; Viet Nam; 16 September 2015 through 18 September 2015. Procedia CIRP, 40, 307-311
Open this publication in new window or tab >>Consideration of market demand volatility risks, when making manufacturing system investments
2016 (English)In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 40, p. 307-311Article in journal (Refereed) Published
Abstract [en]

When investing in new manufacturing systems, many aspects must be taken into consideration to ensure a sustainable business. In respect to the financial aspect, both the one-off investment cost and the continuous operational cost must be analysed to ensure that the life-cycle cost perspective is appreciated. However, one detail in the cost analyses that is often overlooked is the composition of fixed and variable cost elements. These details are important to be able to better manage the risk of market demand volatility, and accordingly make appropriateinvestment decisions. This case study demonstrates that when there is a low risk for reduced market demand, investing in a manufacturing system with low variable cost is favourable. However, if there is a high risk for reduced market demand, the importance will instead be to have a low fixed cost, as this will be the dominant cost factor.

Keywords
Manufacturing System; Sustainable; Investment; Finance; Case Study; Cost Analyses; Risk Management
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-8791 (URN)10.1016/j.procir.2016.01.044 (DOI)2-s2.0-84966657934 (Scopus ID)
Conference
13th Global Conference on Sustainable Manufacturing, GCSM 2015; Binh Du'o'ng New City; Viet Nam; 16 September 2015 through 18 September 2015
Funder
Knowledge Foundation, 20110263
Available from: 2016-01-11 Created: 2015-12-14 Last updated: 2019-05-15Bibliographically approved
Johansson, A., Gustavsson Christiernin, L. & Pejryd, L. (2016). Manufacturing System Design for Business Value, a Holistic Design Approach. Paper presented at 26th CIRP Design Conference, Conference, Stockholm, June, 2016. Procedia CIRP, 50, 659-664
Open this publication in new window or tab >>Manufacturing System Design for Business Value, a Holistic Design Approach
2016 (English)In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 50, p. 659-664Article in journal (Refereed) Published
Abstract [en]

When designing and developing manufacturing systems, many aspects need to be considered. Typically, the manufacturing design objectives are specified to achieve certain operational requirements around quality, capacity, cost etc. They are also specified withthe intention to ensure efficient processes related to manufacturing, such as maintenance, logistics, not to mention the main process of manufacturing the actual part. This study proposes that a wider company perspective should be considered during manufacturing system design, to achieve a greater business value. The manufacturing system should be designed to create value to other core business processes, such as product development, marketing, sales and services. This paper also presents examples on value perspectives to consider and how this approach can be implemented.

Keywords
Process, manufacturing, design, business, value
National Category
Computer Systems Information Systems, Social aspects
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-9912 (URN)10.1016/j.procir.2016.04.140 (DOI)2-s2.0-84986571388 (Scopus ID)
Conference
26th CIRP Design Conference, Conference, Stockholm, June, 2016
Funder
Knowledge Foundation, 20110263
Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2019-05-15Bibliographically approved
Johansson, A., Pejryd, L. & Gustavsson Christiernin, L. (2016). Production support model to manage market demand volatility risks. Paper presented at 49th CIRP Conference on Manufacturing Systems (CIRP-CMS 2016) Stuttgart, Germany, May 25-27, 2016. Procedia CIRP, 57C, 664-668
Open this publication in new window or tab >>Production support model to manage market demand volatility risks
2016 (English)In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 57C, p. 664-668Article in journal (Refereed) Published
Abstract [en]

In the investment selection process during the design of new manufacturing systems, both the technical attributes and the expected financial performance need to be evaluated. To manage the financial risks with market volatility, it is important to understand the composition of fixed and variable cost factors in relation to the expected volume interval. The support model developed in this paper will in a simple and intuitive way visualise the effect on production cost due to changes in market demands. It can also be used to evaluate the volume sensitivity of existing manufacturing systems, even compare systems making different products.

Keywords
Manufacturing System, Investment, Finance; Case Study, Cost Analyses, Risk Management
National Category
Computer Systems
Research subject
ENGINEERING, Computer engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-9933 (URN)10.1016/j.procir.2016.11.115 (DOI)2-s2.0-85006977733 (Scopus ID)
Conference
49th CIRP Conference on Manufacturing Systems (CIRP-CMS 2016) Stuttgart, Germany, May 25-27, 2016
Funder
Knowledge Foundation, 20110263
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-05-15Bibliographically approved
Pejryd, L., Beno, T. & Carmignato, S. (2014). Computed Tomography as a Tool for Examining Surface Integrity in Drilled Holes in CFRP Composites. Paper presented at 2nd CIRP Conference on Surface Integrity, CSI 2014; Nottingham; United Kingdom; 28 May 2014 through 30 May 2014; Code 105460. Procedia CIRP, 13, 43-48
Open this publication in new window or tab >>Computed Tomography as a Tool for Examining Surface Integrity in Drilled Holes in CFRP Composites
2014 (English)In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 13, p. 43-48Article in journal (Refereed) Published
Abstract [en]

In light weight structures the joining of composite materials and of composites to metals are key technologies. A manufacturing method associated with joining is the drilling of holes. The hole creation in CRFP through drilling is associated with several defects related to the process, both on the entry and exit sides of the hole and also with dimensional and surface roughness issues of the hole wall. The detection of damage due to the process is not trivial. Especially interesting is non-destructive methods. In this work X-ray computed tomography is used to determine defects due to drilling of holes in a CFRP composite using twist drills with different geometrical features at different drilling parameters. The results can be used to establish relationship between different geometrical features of drills in combination with cutting parameters and resulting surface integrity of holes. © 2014 The Authors. Published by Elsevier B.V.

Keywords
Computed tomography, Drilling, Composite, Inspection, Surface integrity ;
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-6258 (URN)10.1016/j.procir.2014.04.008 (DOI)2-s2.0-84901795373 (Scopus ID)
Conference
2nd CIRP Conference on Surface Integrity, CSI 2014; Nottingham; United Kingdom; 28 May 2014 through 30 May 2014; Code 105460
Note

Available online 21 May 2014

Available from: 2014-05-23 Created: 2014-05-23 Last updated: 2019-05-10Bibliographically approved
Anderberg, S., Beno, T. & Pejryd, L. (2014). Process planning for cnc machining of swedish subcontractors: A web survey. Paper presented at 47th CIRP Conference on Manufacturing Systems, CMS 2014. Procedia CIRP, 17, 732-737
Open this publication in new window or tab >>Process planning for cnc machining of swedish subcontractors: A web survey
2014 (English)In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 17, p. 732-737Article in journal (Refereed) Published
Abstract [en]

Process planning of CNC machining is critical to ensure cost, time and quality parameters of manufacturing operations. At the heart of process planning is, typically the process planner, who must make a multitude of decisions regarding machines, cutting strategies, tools and process parameters etc. Today there are a number of different tools and methods available to aid the process planner. This paper explores today’s industrial use of some of these aids and outlinespotential underlying reasons for the current state. The empirical data is based on a questionnaire survey of Swedish CNC machining sub-contractors. The main conclusion is that despite a long history of development of various aids (CAD/CAM, PLM standards etc.) there is still a large proportion of the industry, which has not yet adopted these aids. By the responding companies 32% do not use any CAM system and only 2% use a PLM system. On the other side of the spectrum is a group of 25% that uses CAM in 75% or more of their planned products. The learning from this survey can be used to better understand the industrial needs and focus research and development efforts.

Keywords
Cams, computer aided design, contractors, cutting tools, industrial applications, process planning, research and development management, surveys, manufacturing operations, performance indicators, PLM, process parameters, quality parameters, questionnaire surveys, research and development, tools and methods, manufacture
National Category
Materials Engineering
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-6692 (URN)10.1016/j.procir.2014.02.055 (DOI)2-s2.0-84904500720 (Scopus ID)
Conference
47th CIRP Conference on Manufacturing Systems, CMS 2014
Available from: 2014-09-17 Created: 2014-09-16 Last updated: 2019-05-07Bibliographically approved
Pejryd, L. & Eriksson, R. (2014). X-ray Computed Tomography as a Tool in Joining Process Development. In: Stahre, Johan, Johansson, Björn & Björkman, Mats (Ed.), Proceedings of the 6th International Swedish Production Symposium 2014: . Paper presented at The 6th International Swedish Production Symposium 2014 (pp. 1-7).
Open this publication in new window or tab >>X-ray Computed Tomography as a Tool in Joining Process Development
2014 (English)In: Proceedings of the 6th International Swedish Production Symposium 2014 / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, p. 1-7Conference paper, Published paper (Refereed)
Abstract [en]

3-D information on defects in joints are of great importance. Computed tomography is a method that holds the promise of generating this information. This work shows several examples of application of CT on joining or joining related processes. The detection of foreign material, cracks and porosity is shown as well as the ability to investigate much larger volumes than what is feasible with traditional cut-ups. Some limitations are also discussed.

Keywords
Computed tomography, welding, brazing, friction stir welding.
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-6990 (URN)978-91-980974-1-2 (ISBN)
Conference
The 6th International Swedish Production Symposium 2014
Available from: 2014-11-14 Created: 2014-11-14 Last updated: 2018-08-12Bibliographically approved
Wanner, B., Eynian, M., Beno, T. & Pejryd, L. (2012). Cutter Exit Effects during Milling of Thin-walled Inconel 718. Advanced Materials Research, 590, 297-308
Open this publication in new window or tab >>Cutter Exit Effects during Milling of Thin-walled Inconel 718
2012 (English)In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 590, p. 297-308Article in journal (Refereed) Published
Abstract [en]

During milling of thin-walled components, chatter vibrations give rise to process issues. These include dimensional inaccuracy, damaged and scrap parts, and damaged cutting tools. This, in turn, leads to loss of production time with increasing cost as a consequence. This paper identifies the force profile during a single cut milling process. It focuses on the exit and post-exit behavior of the cut and discusses the process dynamics. The force profiles of various tool-to-workpiece positions are analyzed as regards the exit and post exit phases. A standard on-the-market cutter and a specially designed zero rake cutter are used in the investigation. Finally, a time-domain simulation of the force is performed and compared to the experimental results. The study concludes that a small change in exit angle may result in a considerable improvement in cutting behavior. In addition, the tool position should be chosen so that the cutter exits in the least flexible direction possible for the workpiece.

Keywords
Chatter vibrations, Thin wall, Inconel 718, Process stability, Exit angle
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-4686 (URN)10.4028/www.scientific.net/AMR.590.297 (DOI)2-s2.0-84870671318 (Scopus ID)
Available from: 2012-12-21 Created: 2012-09-26 Last updated: 2019-04-26Bibliographically approved
Pejryd, L., Repo, J. & Beno, T. (2012). Machine Tool Internal Encoders as Sensors for the Detection of Tool Wear. In: Procedia CIRP: 3rd CIRP Conference on Process Machine Interactions, 29-30 October 2012, Nagoya, Japan.. Paper presented at 3rd CIRP Conference on Process Machine Interactions (3rd PMI) (pp. 46-51).
Open this publication in new window or tab >>Machine Tool Internal Encoders as Sensors for the Detection of Tool Wear
2012 (English)In: Procedia CIRP: 3rd CIRP Conference on Process Machine Interactions, 29-30 October 2012, Nagoya, Japan., 2012, p. 46-51Conference paper, Published paper (Refereed)
Abstract [en]

Tool wear in machining changes the geometry of the cutting edges, which effect the direction and amplitudes of the cutting forcecomponents and the dynamics in the machining process. These changes in the forces and dynamics are picked up by the internalencoders and thus can be used for monitoring of changes in process conditions. This paper presents an approach for the monitoringof a multi-tooth milling process. The method is based on the direct measurement of the output from the position encoders availablein the machine tool and the application of advanced signal analysis methods.

The paper investigates repeatability of the method developed and how to detect wear in an individual tooth in a milling cutter. Theresults of this work show that various signal features which correlate with tool wear can be extracted from the first few oscillatingcomponents, representing the low-frequency components, of the machine axes velocities. The responses from the position encodersexhibit good repeatability, especially short term repeatability while the long-term repeatability is more unreliable. A worn toothincreases the irregularity in the encoder responses and can be identified at an early stage of the cut.

Series
Procedia CIRP, ISSN 2212-8271 ; vol 4
Keywords
Tool wear detection, milling, encoder signals, repeatability, signal analysis
National Category
Engineering and Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-5078 (URN)10.1016/j.procir.2012.10.009 (DOI)2-s2.0-84879829011 (Scopus ID)
Conference
3rd CIRP Conference on Process Machine Interactions (3rd PMI)
Available from: 2013-02-01 Created: 2013-02-01 Last updated: 2019-03-13Bibliographically approved
Repo, J., Pejryd, L. & Beno, T. (2012). Measurement method for the identification of individual teeth in milling operations. CIRP - Journal of Manufacturing Science and Technology, 5(1), 26-32
Open this publication in new window or tab >>Measurement method for the identification of individual teeth in milling operations
2012 (English)In: CIRP - Journal of Manufacturing Science and Technology, ISSN 1755-5817, E-ISSN 1878-0016, Vol. 5, no 1, p. 26-32Article in journal (Refereed) Published
Abstract [en]

Internal sensors already available in the machine tools may prove to be an interesting approach to monitor the machining process. Accurate determination of the position of the individual tooth on a milling cutter is important to be able to correlate the measured responses from the machine tool position encoders to the tooth or teeth that may be the cause of the response.

The aim of the work presented in this paper is to develop a measurement method to identify the individual tooth on a milling cutter by their angular position relative to a specified 0-degree direction. If the lower and upper bounds of the cutting zone are known, together with the actual spindle position and the starting time of the cut, it will be possible to track and identify which teeth are within the cutting zone at a given time in the following off-line analysis of the responses. This may simplify the task of finding potential correlations between the state of individual teeth on the milling cutter with measured responses from various sensors during the milling process. The proposed method is based on a reflectance detector and uses accurate position information provided by the position encoders.

A validation of the measurement method is also presented which shows that the error of the estimated angular position is approximately +/- 0.15 degrees for the validation setup used in this case.

Keywords
Angular position measurement, Milling tool, Encoder signals, Reflectance detector
National Category
Engineering and Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-4989 (URN)10.1016/j.cirpj.2011.11.002 (DOI)2-s2.0-84856660606 (Scopus ID)
Projects
Robust Machining
Funder
Vinnova, 42176
Available from: 2013-01-10 Created: 2013-01-02 Last updated: 2019-04-26Bibliographically approved
Wanner, B., Eynian, M., Beno, T. & Pejryd, L. (2012). Milling Strategies for Thin-walled Components. Advanced Materials Research, 498, 177-182
Open this publication in new window or tab >>Milling Strategies for Thin-walled Components
2012 (English)In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 498, p. 177-182Article in journal (Refereed) Published
Abstract [en]

Recent developments in the Aerospace industry have led to thin-walled, reduced-weight engine designs. Due to demands in manufacturing, production speeds and material removal rates (MRR) have increased. As component wall thickness gets thinner, the consequence oftentimes is an increase in chatter vibrations. This paper suggests that a correctly chosen tool-to-workpiece offset geometry may lead to a robust and chatter-free process. The results show the differences in force response for three geometries while varying the overhang of the workpiece. This is part of a concerted effort to develop a robust methodology for the prediction of chatter vibrations during milling operations of thin-walled Aerospace components. This paper outlines certain robust machining practices. It also analyzes the criticality of the choice of offset between tool and workpiece during milling setup as well as the effects that the entry and exit of cut have on system vibrations.

Keywords
Thin-wall, Inconel 718, chatter, machining vibrations
National Category
Engineering and Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-4329 (URN)10.4028/www.scientific.net/AMR.498.177 (DOI)2-s2.0-84860254349 (Scopus ID)
Available from: 2012-05-31 Created: 2012-05-21 Last updated: 2019-04-26Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1408-2249

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