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  • 1.
    Campos, Jaime
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Jantunen, Jantunen
    Prakash, Om
    Växjö University.
    A web and mobile device architecture for mobile e-maintenance2009In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 45, no 1-2, p. 71-80Article in journal (Refereed)
    Abstract [en]

    The paper presents the development of a mobile maintenance support system based on web and mobile device technologies, i.e., personal digital assistant. The architecture relies on a shop floor system and a supporting system in a diagnostic center. The shop floor system is supported by a mobile device, which helps the maintenance engineer to perform maintenance tasks. This gives great support to the maintenance engineer as it facilitates the access to decision-making support, work order, and spare part handling modules etc. that are available in the device. The diagnostic center provides the maintenance engineer with decision support for his various tasks, when needed. Moreover, a database table listener agent, located at the database server, was developed to keep track of the maintenance engineer’s work orders at a certain priority level. The proposed approach can reduce the maintenance costs and solve the problem of the unavailability of an expert. More efficient maintenance is believed to be achieved through the use of web and agent technologies since data, maintenance systems, and processing can be gathered and integrated and data can be acquired from additional sources when necessary. The proposed system, the web, and embedded technologies as well as remote communication were tested successfully.

  • 2.
    De Backer, Jeroen
    et al.
    Högskolan Väst, Sweden.
    Bolmsjö, Gunnar
    University West, Trollhättan, Sweden.
    Christiansson, Anna-Karin
    Högskolan Väst, Sweden.
    Temperature control of robotic friction stir welding using the thermoelectric effect2014In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 70, no 1-4, p. 375-383Article in journal (Refereed)
    Abstract [en]

    Friction stir welding (FSW) of non-linear joints receives an increasing interest from several industrial sectors like automotive, urban transport and aerospace. A force-controlled robot is particularly suitable for welding complex geometries in lightweight alloys. However, complex geometries including three-dimensional joints, non-constant thicknesses and heat sinks such as clamps cause varying heat dissipation in the welded product. This will lead to changes in the process temperature and hence an unstable FSW process with varying mechanical properties. Furthermore, overheating can lead to a meltdown, causing the tool to sink down into the workpiece. This paper describes a temperature controller that modifies the spindle speed to maintain a constant welding temperature. A newly developed temperature measurement method is used which is able to measure the average tool temperature without the need for thermocouples inside the tool. The method is used to control both the plunging and welding operation. The developments presented here are applied to a robotic FSW system and can be directly implemented in a production setting.

  • 3.
    Ferreira Silva, Ana Catarina
    et al.
    University West.
    De Backer, Jeroen
    University West.
    Bolmsjö, Gunnar
    University West.
    Temperature measurements during friction stir welding2017In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 88, no 9-12, p. 2899-2908Article in journal (Refereed)
    Abstract [en]

    The increasing industrial demand for lighter, more complex and multi-material components supports the devel-opment of novel joining processes with increased automationand process control. Friction stir welding (FSW) is such aprocess and has seen a fast development in several industries. This welding technique gives the opportunity of automationand online feedback control, allowing automatic adaptation to environmental and geometrical variations of the component. Weld temperature is related to the weld quality and therefore proposed to be used for feedback control. For this purpose, accurate temperature measurements are required. This paper presents an overview of temperature measurement methods applied to the FSW process. Three methods were evaluated in this work: thermocouples embedded in the tool, thermocouples embedded in the workpiece and the tool-workpiece thermocouple (TWT) method. The results show that TWT is anaccurate and fast method suitable for feedback control of FSW.

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