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  • 1.
    Ottosson, Peter
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Lindell, Hans
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Gretarsson, Snaevar
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Fingertip Model for Analysis of High-Frequency Vibrations2023Ingår i: Proceedings, E-ISSN 2504-3900, Vol. 88, nr 1, artikel-id 6Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    High-frequency shock-type vibrations (HFVs) from, e.g., impact wrenches with a frequency content mainly above 1250 Hz have long been suspected to cause a significant number of vibration injuries, HAVS. These vibrations are unregulated in the current standard for risk estimation, ISO 5349-1; thereby, the risk of injury is suspected to be underestimated. The objective of this study was to investigate the effects on finger tissue subjected to HFVs similar to those from impact wrenches by using a 2D finite element model of a fingertip. The model was validated through experiments. Using the input acceleration from the experiments, the model predicted high pressure variation and particular negative pressures at levels close to 0.1 MPa (1 Bar) or more, which are levels where cavitation in liquid can occur, with a detrimental effect on biological systems.

  • 2.
    Ottosson, Peter
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Pilthammar, J
    Blekinge Institute of Technology, Sweden; Volvo Cars, Sweden.
    Wiklund, Daniel
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Skåre, Thomas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Sigvant, M
    Blekinge Institute of Technology, Sweden; Volvo Cars, Sweden.
    Substitutive models of press deflections for efficient numerical die cambering2023Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1284, nr 1, s. 012060-012060Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cost and time for stamping die tryouts are significant within the car industry. A major contributing factor is that elastic deflections of stamping dies and presses are usually not considered during the virtual die design and forming simulation phase. Active surfaces of stamping dies are only cambered based on previous experiences of tool types and stamping presses. However, almost all stamping dies and presses are unique, and available experiences are not valid for new sheet materials. This leads to component deviations and often several loops of tool adjustments are needed. Previously partners within the SMART Advanced Manufacturing research project CAMBER have developed advanced deflection measuring devices to quantify the elastic deformations of stamping presses. Using these measurements, cambering methodologies can be utilized in sheet metal forming simulations. In this paper numerical substitutive stamping press models are described which are capable of compensating for measured stamping press dynamics. The result show that a numerical compensated tool can improve the contact by over 80% compared to the corresponding contact without compensation.

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  • 3.
    Pilthammar, Jan
    et al.
    Volvo Cars, Sweden; Blekinge Institute of Technology, Sweden.
    Skåre, Thomas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Galdos, L.
    Mondragon Unibertsitatea, Spain.
    Frojdh, K.
    Proximion AB, Sweden.
    Ottosson, Peter
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Wiklund, Daniel
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Carlholmer, Jonathan
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Sigvant, M.
    Volvo Cars, Sweden; Blekinge Institute of Technology, Sweden.
    Ohlsson, M.
    RISE Research Institutes of Sweden.
    Argandoña, E. Sáenz de
    Mondragon Unibertsitatea, Spain.
    Abbasi, F.
    Mondragon Unibertsitatea, Spain.
    Sarasua, O.
    Fagor Arrasate S. Coop, Spain.
    Garro, A.
    Koniker S. Coop, Spain.
    Rutgersson, W.
    Cascade control AB, Sweden.
    New press deflection measuring methods for the creation of substitutive models for efficient die cambering2021Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1157, artikel-id 012076Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cost and time for die tryout are significant within the car industry, and elastic deflections of dies and presses are most commonly not considered during the virtual die design and forming simulation phase. Because of this, active surfaces of stamping dies are only cambered based on previous experiences of tool types and presses. However, almost all stamping dies and presses are unique, and available experiences are not valid for new materials. Partners within the Eureka SMART Advanced Manufacturing research project CAMBER have developed advanced deflection measuring devices to quantify the elastic deformations of presses. Using these measurements, cambering methodologies can be utilized in sheet metal forming simulations. Important breakthroughs in recent years enabling the cambering methodology consists of efficient simulation strategies for full scale simulations with elastic dies and optimization techniques for creating substitutive press structures based on measurements. Furthermore, modern press deflection measurement methods are beneficial in applications such as Industry 4.0, predictive maintenance, product quality control, etc. through a more advanced understanding and live monitoring of the press system.

  • 4.
    Wadman, Boel
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Ottosson, Peter
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Holmberg, Jonas
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Ingemarsson, Lars-Olof
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Sagström, Elisabeth
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Time-dependent residual stress and geometry analysis of UHSS deep drawn components,2013Ingår i: Proceedings of International Deep Drawing Research Group Conference, Zurich, Switzerland, June 2-5., 2013Konferensbidrag (Övrigt vetenskapligt)
  • 5.
    Werke, Mats
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Ottosson, Peter
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Semere, Daniel
    KTH Royal Institute of Technology, Sweden.
    Yacob, Filmon
    KTH Royal Institute of Technology, Sweden.
    Prediction of Residual Stresses in Components Using the Contour Method2022Ingår i: Advances in Transdisciplinary Engineering, IOS Press BV , 2022, Vol. 21, s. 159-169Konferensbidrag (Refereegranskat)
    Abstract [en]

    During machining the accumulated bulk stresses induced by previous shape forming process steps, such as forging, casting or additive manufacturing and subsequent heat treatment, will be released and cause undesirable geometry errors on the final component. By considering the residual stresses during process planning a significant improvement in dimensional accuracy can be achieved. This paper presents experiences for prediction of residual stresses for components with complex geometries using the Contour method. Three sectioning procedures have been tested and a cutting strategi using Electric Discharge Machining with slow feed rate and cutting from two sides with final cut in the middle is proposed. Two Finite Element modelling strategies for 3D-models have been tested and a meshing strategy based on extrusion of the geometry from the cut plane is recommended. Further, a procedure to automate the Finite Element meshing of complex structures using the Alpha Shape algorithm is proposed. The ambition is to integrate this algorithm in procedures for automatization of the entire analysis. © 2022 The authors 

  • 6.
    Werke, Mats
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Wretland, Anders
    GKN Aerospace AB, Sweden.
    Ottosson, Peter
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Holmberg, Jonas
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Machens, Michael
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Semere, Daniel
    KTH Royal Institute of Technology, Sweden.
    Geometric distortion analysis using a combination of the contour method and machining simulation2018Ingår i: Procedia CIRP, 2018, s. 1481-1486Konferensbidrag (Refereegranskat)
    Abstract [en]

    During machining the material removal releases residual stresses introduced by previous process steps. This causes geometric machining distortions and thereby high rejection rates and costs. By simulating the process chain it is possible to predict this type of distortions. However, this requires advanced material models and accurate process- and material data for the individual processes. In order to simplify the modelling efforts a methodology that combines the contour method with machining simulation is proposed. The methodology is validated for an aerospace component using deep layer removal X-ray diffraction and CMM measurements. The methodology will improve possibilities to reduce machining distortions. © 2018 The Authors.

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  • 7.
    Wärmefjord, Kristina
    et al.
    Chalmers University of Technolgy, Sweden.
    Söderberg, Rickard
    Chalmers University of Technolgy, Sweden.
    Ottosson, Peter
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Werke, Mats
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Lorin, Samuel
    Chalmers University of Technolgy.
    Lindkvist, Lars
    Chalmers University of Technolgy.
    Wandebäck, Fredrik
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Prediction of geometrical variation of forged and stamped parts for assembly variation simulation.2013Konferensbidrag (Övrigt vetenskapligt)
1 - 7 av 7
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