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Träfflista för sökning "(WFRF:(Christiansson Anna Karin 1947 )) srt2:(2010-2014) srt2:(2014)"

Sökning: (WFRF:(Christiansson Anna Karin 1947 )) srt2:(2010-2014) > (2014)

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1.
  • De Backer, Jeroen, 1987-, et al. (författare)
  • Temperature control of robotic friction stir welding using the thermoelectric effect
  • 2014
  • Ingår i: The International Journal of Advanced Manufacturing Technology. - : Springer. - 0268-3768 .- 1433-3015. ; 70:1-4, s. 375-383
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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2.
  • Hagqvist, Petter, 1986, et al. (författare)
  • Emissivity compensated spectral pyrometry-algorithm and sensitivity analysis
  • 2014
  • Ingår i: Measurement Science and Technology. - : IOP Publishing. - 0957-0233 .- 1361-6501. ; 25:2
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to solve the problem of non-contact temperature measurements on an object with varying emissivity, a new method is herein described and evaluated. The method uses spectral radiance measurements and converts them to temperature readings. It proves to be resilient towards changes in spectral emissivity and tolerates noisy spectral measurements. It is based on an assumption of smooth changes in emissivity and uses historical values of spectral emissivity and temperature for estimating current spectral emissivity. The algorithm, its constituent steps and accompanying parameters are described and discussed. A thorough sensitivity analysis of the method is carried out through simulations. No rigorous instrument calibration is needed for the presented method and it is therefore industrially tractable.
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