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  • 651.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    A Detailed Examination of Two Inoculants Used in Nodular Cast Irons1999In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 11, no 5, p. 351-356Article in journal (Refereed)
  • 652.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Application of microstructure modelling for ductile iron alloy property optmization1999In: Revue de Metallurgie, ISSN 0035-1563, Vol. 96, no JA99, p. 142-Article in journal (Other academic)
  • 653.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Cast Iron Design: Processes, Alloys, and Properties2004In: Handbook of mechanical alloy design / [ed] George E. Totten, Lin Xie, Kiyoshi Funatani, New York: Marcel Dekker , 2004Chapter in book (Other (popular science, discussion, etc.))
  • 654.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Influence of Antimony on Microstructure Formation and Mechanical Properties in Thick-walled Ductile Iron Castings2003In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 16, no 1-3, p. 119-124Article in journal (Refereed)
  • 655.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Modeling of ferrite growth in nodular cast iron1996In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 27, no 8, p. 2209-2220Article in journal (Refereed)
  • 656.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Modelling and simulation of elastic properties in cast compacted graphite iron engine blocks2006In: Modeling of casting, welding, and advanced solidification processes - XI: proceedings from the Eleventh International Conference on Modeling of Casting, Welding and Advanced Solidification Processes, held in Club Méditerranée, Opio, France on May 28-June 2, 2006 / [ed] Charles-André Gandin, Michel Bellet, Warrendale: TMS, cop. , 2006, p. 658-692Conference paper (Other academic)
  • 657.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Modelling of Pearlite Decomposition in Nodular Cast Iron1993In: Modeling of casting, welding and advanced solidification processes - VI: proceedings of the sith conference in a series on Modeling Casting and Welding Processes, held in Palm Coast, Florida, March 21-26, 1993 / [ed] T.S. Piwonka, V. Voller, L. Katgerman, Warrendale, Pa.: The Minerals, Metals & Materials Society , 1993, p. 71-78Conference paper (Other academic)
  • 658.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Simulation of Microstructure Formation and Mechanical Properties in Cast Iron Components: Comparison with Experiments in a Ductile Iron Bearing Housing2002Conference paper (Other academic)
  • 659.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Olsson, Jörgen
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Schäfer, Willfreid
    Simulation of cooling curves, microstructures and mechanical properties in cast Al-Si based alloys2006In: Modeling of Casting, Welding and Advanced Solidification Processes - XI: proceedings from the Eleventh International Conference on Modeling of Casting, Welding and Advanced Solidification Processes, held in Club Méditerranée, Opio, France on May 28-June 2, 2006 / [ed] Charles-André Gandin, Michel Bellet, Warrendale: TMS, cop. , 2006, p. 693-700Conference paper (Refereed)
  • 660.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Olsson, Jörgen
    Schäfer, Wilfried
    Simulation of Cooling Curves, Microstructures and Mechanical Properties in Cast Al-Si Based Alloys2006In: Conference on Modelling of Casting and Welding Processes, Opio, France, 2006Conference paper (Other academic)
  • 661.
    Westbroek, Alexander
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Hardling, Niklas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Studie av interntransporter vid SKF Göteborg2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    SKF Gothenburg is planning on a restructuring of their production area and sees this as an excellent opportunity to update and make their internal logistics more efficient. This thesis suggests how a more efficient internal logistics can be achieved with higher fill ratios and minimal environmental impact. Also resource savings linked to the internal material handling will be reviewed.

    To carry out properly informed and substantial improvements a field study in form of surveys, interviews and forms have been completed. The result is a current status analysis where potential areas of improvement have been clarified. The driving schedules have carefully been reviewed and modifications have been made to meet the demands and requirements set by the company.

    The study has resulted in updated driving schedules that take account of the restructured production area whilst meeting the productions daily requirements. A more efficient transport logistics with better use of resources have been achieved through increased fill ratios and reduced truck transportation outside, this with a minimal impact on the environment. The driving schedules, which the project resulted in, have high flexibility. Due to the constant changes that take place in the production area the driving schedules should rather be considered as a basis to further develop, than a finished result.

    The low amount of data available at the project's start-up required an own field study that resulted in own primary data. The reliability of the generated data had benefited if more time was available, a larger time frame for data collection had led to a broader and deeper understanding of the internal logistics. Despite the projects short time frame, the result is considered to be reliable.

    The conclusion is that with a good knowledge of how a company's internal transport flows look, minor changes can lead to big differences in terms of reduced environmental impact, more efficient internal transports and resource savings.

  • 662.
    Wetter, Pernilla
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Kulig, Martin
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Hållfasthetsegenskaper i gjutjärn: tensile properties of cast iron2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the last few years people have become more and more aware of how humanity is affecting the climate. In the direction of reducing the greenhouse gases is to design engines with higher tensile properties and reduced weight, in order to achieve lower fuel consumption and cleaner fuel incineration in today's truck engines.

    In order to achieve these requirements it’s necessary to increase the combustion pressure in the engine. This requires higher tensile properties and high thermal conductivity of the engine material. The department of Component Technology at the University of Jönköping in collaboration with Volvo Powertrain AB, Scania CV AB and DAROS Piston Rings AB has been commissioned to develop this material and to find knowledge of material properties used in truck engines and piston rings used for marine applications.

    The purpose with this work is to analyze the tensile properties of a series of cast iron, cast under different metallurgical conditions.

    Four different series of cast irons have been analyzed from four points of view, carbon concentration, nodularity, amount inoculation and cooling rate.

    After the tensile test all specimen data was analyzed in a mathematic calculation program called Matlab 2006a. These results were plotted in different diagrams to show the relations between the variables.

    A low carbon contents and high cooling rate result in high tensile properties and vice versa. Also, a high nodularity gives the same result, i.e. high ultimate tensile strength, yield strength and young’s modulus. The experiment which cover different amount of inoculation, shows that Superseed is the most efficient element to increased tensile properties followed by Fe-powder and Fe-C-powder.

    Lamellar graphite iron has the highest thermal conductivity and vibration damping properties compared to compact graphite iron followed by nodular graphite iron. Researches show that the thermal conductivity increases with slow cooling rate, irrespective of graphite structure. When designing new diesel engines, high tensile properties as well as high thermal conductivity are wanted. Compact cast iron has a compromised quality of these requirements. Higher tensile properties are a higher priority than thermal conductivity when the casting cooling rate is chosen.

  • 663.
    Widfeldt, Magnus
    et al.
    Swerea IVF.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Kilbo, Per
    Swerea IVF.
    An Improved Quotation Process within Manufacturing SMEs as Part of a Strategy for Growth2008In: 2008 Proceedings of Swedish Production Symposium, November 18 - 20, 2008, Stockholm, Sweden., Stockholm: Swedish Production Academy , 2008Conference paper (Refereed)
    Abstract [en]

    This paper is generally focusing on the customer and supplier relation in a product creation perspective. The work has specifically been performed together with a metal working SME, and a main customer to this company. Four criterias for a long term succesful relationship and business success was stated from the beginning of the project: In house efficiency; Openness in the chain of suppliers; Co-operative product development and Precision of quotation. Those four areas are all covered in case studies, in close relations to the SME. The problems to combine close relationships and competitive business between customer´s and suppliers are discussed in the paper. A specific task in the project has been to create a demonstrator, a prototype quotation generator for the SME. The goal for the demonstrator was to increase precision and decrease lead times in the quotation process. An evaluation prooves that this is possible, and the demonstrator will stepwise be implemented in the SME. During the project, the SME has had a significant growth. Investments in automation and 3D CAD are made. The project is funded by Vinnova and the companies involved.

  • 664.
    Wikman, Tom
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Krogell, Mathias
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Blinkande markör2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents a thesis performed by two students at Jönköping University in the field of Mechanical Engineering, Product Development and Design. The task has been carried out on the behalf of the company NPB Automation. The task aims to develop a new generation of marker to the industry for lid handling with respect to beverage can-related products.

    Materials selection, design of marker and the electronic circuit has been the main focus of the work. The industry of today regarding automation is a growing industry where development and efficiency is constantly happening. This work has contributed to increase the efficiency of handling the substantial number of lids that are being processed today.

    The report addresses a further development from the already existing marker of the company which is used when two different types of beverage can lids are changed. The work was initiated with a pilot study which contained gathering data by performing literature research. The pilot study was done to identify important parameters for the products design. These parameters were the foundation for generating different concepts where an elimination matrix later was used for choosing a winning concept. The final decision of the concept was done in consultation with NPB Automation.

    This concept underwent some changes throughout the process of the report but the main focus was to design the electronic circuit so that it fits in the marker without much change of its original dimensions. At the end of the work with NPB Automation a design proposal on the marker had been developed using CAD-modeling as well as manufacturing documentation with blueprints and a BOM-list.

  • 665.
    Winogradoff, Theo
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Vatten Velociped Koncept2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 666.
    Wirén, Carina
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Stanikowski, Adrian
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Konceptstudie på plug-and-play system2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The report deals with a bachelor’s degree project in Product Development and Design at Jönköping University 2018. The thesis was carried out on behalf of Orkla House Care AB as the concluding part of the Mechanical Engineering program. The work was carried out by Adrian Stanikowski and Carina Wirén.

    The work consisted of developing an extensional concept on a plug-and-play system. Orkla House Care AB bought Anza, a manufacturer of various painting tools, in 2012. Selected products have an extensibility that gives them a more ergonomic approach to painting ceilings, walls, and floors. The existing extension system has an outgoing patent and therefore Orkla House Care has designed this project focusing on product development and construction.

    To get a clearer picture of what users are looking for at the product, a preliminary study was carried out. After the completion of this preliminary study, a product specification could be created. At the idea generation phase, all ideas were recorded where the product specification was omitted to avoid limiting creative thinking. The specification was then the foundation of the final concepts chosen by screening.

    The work focused on creating a user-friendly extension system that clearly shows the function. The focus area has primarily included the elimination of the end plug of the extensible tool, as well as avoiding the use of buttons for attachment and detachment. This focus is to avoid as many misunderstandings for the user as possible.

    The result of the work was a new plug-and-play system with a new design solution.

  • 667.
    Wolf, Simon
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Kapactitetsstudie: På SKF Motion Technology2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract 

    A capacity study has been made on a production line for a leading bearing and seal manufacturing company – In a view of manufacturing technology, logistics and economic. 

    Simon Wolf is the author of this thesis and his mentor is named Jonas Bjarnehäll. 

    On the two types of actuators, line balancing should be made in order to decide the maximum capacity with a different amount of staff used. An investment analysis will be needed to investigate if an investment can be presumed to be appealing from a financial perspective. Finally, the location of the stations should be made which will be adapted to the investment and line balancing

    The purpose of this thesis is to develop the most effective layout possible regarding both operator- and production effectiveness.

    The thesis is made using the methods following: 

    • The six steps for line balancing

    • Systematic Local Planning

    • Carrying cost calculation

    In conclusion, 46 functional classifications and a placement arrangement that fits to those and other criterias has been produced. Following an investment analysis between two different layouts one can find the most successful and effective one. All these constitute the result of the thesis. 

  • 668.
    Xu, Yuchun
    et al.
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Erkoyuncu, John
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Bankole, O.
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Goh, Y.
    Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, UK.
    Cheung, W. M.
    School of Computing, Engineering and Information Sciences, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK.
    Baguley, P.
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Wang, Q.
    School of Engineering and Computing Sciences, Durham University, Durham, DH1 3LE, UK.
    Arundachawat, P.
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Shehab, E.
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Newnes, L.
    Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK.
    Roy, R.
    Manufacturing Department, School of Applied Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.
    Cost Engineering for Manufacturing: Current and Future Research2012In: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 25, no 4/5, p. 300-314Article in journal (Refereed)
    Abstract [en]

    The paper aims to identify the scientific challenges and point out future research directions on Cost Engineering. The research areas covered in this paper include: Design Cost; Manufacturing Cost; Operating Cost; Life Cycle Cost; Risk & Uncertainty management; Affordability Engineering. Collected information at the academic forum on Cost Engineering held at Cranfield University in 2008 and further literature review findings are presented. The forum set the scope of the Cost Engineering research, a brainstorming was held on the forum and literatures were further reviewed to understand the current and future practices in cost engineering. The main benefits of the paper include coverage of the current research on cost engineering from different perspectives and the future research areas on Cost Engineering.

  • 669.
    Yusuf, Maryan
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Sege, Victoria
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Framgångsfaktorer vid övergång till ISO 9001:20152017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose with this study aims to identify the most important and critical factors for small-sized companies to make way for a successful transition to ISO 9001:2015. Because of the new structure, it is difficult for companies to interpret the standard and what is required to achieve a certification. This study has therefore been carried out at the manufacturing company FIG Metall in Gnosjö. 

    The study is based on qualitative research. Observation, interviews and document views were made at FIG Metall. Interviews were also carried out with the auditing company Qvalify and the Swedish Standards Institute to receive their views on which the important factors are as well as the general difficulties for companies when transitioning.  The interviews were semi-structured which resulted in an open discussion where the respondents were free to answer based on how they perceived the questions.

    The results of the empirical data were the basis of the analysis and the conclusion. The different methods used in the report can be seen in figure 10 which shows the triangular approach of the study. Qvalify and SIS agreed upon the same areas companies need to focus on when transitioning to ISO 9001:2015.

    The result of this study shows that the most important areas smaller companies need to focus on when transitioning are Leadership, Context of the organization, Risk based thinking and Process approach. The study concluded that ISO 9001:2015 is closely related to total quality management (TQM), organizational development and organizational psychology and can be used as complementary tools to the standard.

     

     

     

  • 670.
    Zamani, Mohammadreza
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Al-Si Cast Alloys - Microstructure and Mechanical Properties at Ambient and Elevated Temperature2015Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Aluminium alloys with Si as the major alloying element form a class of material providing the most significant part of all casting manufactured materials. These alloys have a wide range of applications in the automotive and aerospace industries due to an excellent combination of castability and mechanical properties, as well as good corrosion resistance and wear resistivity. Additions of minor alloying elements such as Cu and Mg improve the mechanical properties and make the alloy responsive to heat treatment. The aim of this work is studying the role of size and morphology of microstructural constituents (e.g SDAS, Si-particles and intermetalics) on mechanical properties of Al-Si based casting alloy at room temperatures up to 500 ºC.

    The cooling rate controls the secondary dendrite arm spacing (SDAS), size and distribution of secondary phases. As SDAS becomes smaller, porosity and second phase constituents are dispersed more finely and evenly. This refinement of the microstructure leads to substantial improvement in tensile properties (e.g. Rm and εF). Addition of about 280 ppm Sr to EN AC- 46000 alloy yields fully modified Si-particles (from coarse plates to fine fibres) regardless of the cooling conditions. Depression in eutectic growth temperature as a result of Sr addition was found to be strongly correlated to the level of modification irrespective of coarseness of microstructure. Modification treatment can improve elongation to failure to a great extent as long as the intermetallic compounds are refined in size.

    Above 300 ºC, tensile strength, Rp0.2 and Rm, of EN AC-46000 alloys are dramatically degraded while the ductility was increased. The fine microstructure (SDAS 10 μm) has superior Rm and ductility compared to the coarse microstructure (SDAS 25 μm) at all test temperature (from room to 500 ºC). Concentration of solutes (e.g. Cu and Mg) in the dendrites increases at 300 ºC and above where Rp0.2 monotonically decreased. The brittleness of the alloy below 300 ºC was related to accumulation of a high volume fraction damaged particles such as Cu- Fe-bearing phases and Si-particles. The initiation rate of damage in the coarse particles was significantly higher, which enhances the probability of failure and decreasing both Rm and εF compared to the fine microstructure. A physically-based model was adapted, improved and validated in order to predict the flow stress behaviour of EN AC- 46000 cast alloys at room temperature up to 400 ºC for various microstructures. The temperature dependant variables of the model were quite well correlated to the underlying physics of the material

  • 671.
    Zamani, Mohammadreza
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Aziziderouei, Mona
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    The role of Sr on microstructure formation and mechanical properties of Al-Si-Cu-Mg cast alloy2013In: TMS Light Metals, 2013, p. 297-302Conference paper (Refereed)
    Abstract [en]

    The aim of this paper is to assess the role of Sr modification on eutectic Si, Fe-rich intermetallic phases and porosity and their responses to the mechanical properties of a commercial high pressure die cast alloy Al-Si-Cu-Mg with Fe level up to 1%. Tensile test samples with a variety of coarsenesses, containing different Sr levels were cast using the gradient solidification technique, that enables a study of the solely influence of Sr on microstructure and tensile properties. The modification altered the morphology and size of eutectic silicon, while did not make a significant change on morphology of Fe-rich intermetallic and volume fraction distribution of porosity. The tensile test results indicate that eutectic Si modification is not a guarantee for improved mechanical properties due to the presence of a variety of intermetallics that tend to have a larger role on initiating and propagating cracks leading to premature failures in these commercial alloys.

  • 672.
    Zander, Patrik
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Hammarström, Johan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Värmebehandling av segjärn med hög kiselhalt2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The background to this thesis was that Qumex Materialteknik at several occasions had received material of type SS 0725 that had shown deficient heat treatment results. The material, which is relatively new, is a cast iron of type ductile iron and differ against other ductile irons because of its high silicon content. According to EN standard ductile irons are classified by their mechanical properties. A problem then occurs with the new material SS 0725 because of this. The material fulfils the requirements for EN-GJS-500-7 and is therefore in the same classification as a ductile iron with much lower silicon content. Two materials having major differences in chemical composition ending up in the same classification can be problematic. The purpose of this report is to determine impact of high silicon content in ductile iron when heat treated and quench hardened.

    The experiment included four materials, and the major difference between the materials were their content of copper and silicon. The heat treatment process was performed at three different temperatures and three different treatment times. Afterwards the samples were quenched in oil. The ambition of the quench hardening was to obtain a material structure of 100% martensite. By optical microscopy and hardness measurements the results then were evaluated. An investigation of the phase transformation temperature in the materials was made by using Differential Scanning Calorimetry.

    The results show that the amount of silicon content has great influence on the temperature for receiving good hardening results. To achieve 100% martensite after quench hardening in materials with low silicon content the temperature needs to be over 840°C. For material with high level of silicon content the temperature for achieving 100% martensite needs to be 900°C and the treatment time should be over 1 h. The relative difference in phase transformation temperature was measured using Differential Scanning Calorimetry. The results of the measurements between the materials with high silicon content and materials with low silicon content was 45°C. This result combined with the analysis of the heat treatment process shows that a major increase of the temperature is needed to heat treat SS 0725.

  • 673.
    Zeybrandt, Peggy
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Effektivisering och produktivitetsökning i produktionsflödet av Hammarhäftare på Isaberg Rapid AB2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    The market’s demand to purchase more cost effective products is continuously increasing. The producers are forced to become more efficient and flexible with resources to produce high quality products at a low cost in order to maintain or increase market shares. With this in mind Isaberg Rapid AB is requesting a project to increase efficiency in the assembly cell of hammertackers. The company has found in Kaizen-events that there is a potential of efficiency improvements in the assembly group that has not been achieved.

    The objective with this paper is to identify the major factors that influence the efficiency in the assembly cell for hammertackers. At the same time the project is to generate data on new operation times, calculate the number of operators required in the cell and to implement standardized work instructions.

    The facts and data have been collected by discussions with operators, time studies and by filming the operation. A one week Kaizen-event with the operators was made, where the selected changes were implemented. The result of the changes in terms of efficiency and output were registered.

    The following basic questions are answered in the report.

    • What changes are required to increase efficiency?
    • What are the non-conformity reasons that prevent the group from reaching the production targets?
    • Is there a need for a different set up in the cell?

    In the Kaizen-event, a number of observations were made in the hammertacker group and the major wastes were identified. The largest wastes were identified to be that materials for packing were too far from the assembly cell, setting times for tool changes were long and that the operators’ workload was not in balance.

     A new layout was made to reduce the distance to packing materials. The height and setting of moulds were changed to get faster mould exchange. Operations were  introduced to the cell to get a better balance of the workload between operators.

    The observed interruptions have mainly been due to lack of different raw materials.

    There was no reason to modify the way work was carried out in the cell; never the less, some minor adjustments were made. The change with the biggest impact was to remind the operators of the factors that affect the productivity most.

    The number of produced products has increased by 21 %, which also gives the corresponding efficiency increase.

    The conclusion of this paper is that increased productivity is obtained by identifying and eliminating waste, increasing the participation of the operators and creating a standardized way of working.

  • 674. Östberg, Olov
    et al.
    Holmgren, Dag
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Gunnarsson, Ewa
    Bord för arbete vid bildskärmsterminaler: en översikt1976Report (Other academic)
  • 675. Östberg, Olov
    et al.
    Holmgren, Dag
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Whittington, C
    Mackay, C
    Granskning av fingeravtryck: Ett synergonomiskt problem1976Report (Other academic)
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