Search for dissertations about: "shape rolling"

Showing result 1 - 5 of 19 swedish dissertations containing the words shape rolling.

  1. 1. Numerical simulation of shape rolling

    University dissertation from Stockholm : KTH

    Author : Stanislav Riljak; KTH.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; shape rolling; wire-rod rolling; finite-element method; generalized plane-strain; dislocation density; material model; TECHNOLOGY Materials science Other materials science; TEKNIKVETENSKAP Teknisk materialvetenskap Övrig teknisk materialvetenskap;

    Abstract : In the first part of this thesis, the FE program MSC.Marc is applied for coupled thermomechanical simulations of wire-rod rolling. In order to predict material behaviour of an AISI 302 stainless steel at high strain rates generated during wire-rod rolling, a material model based on dislocation density is applied. READ MORE

  2. 2. Evolution of artificial defects during shape rolling

    University dissertation from Stockholm : KTH

    Author : Mirjana Filipovic; Filipovic Mirjana; KTH.; Högskolan Dalarna.; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Materials science Other materials science; TEKNIKVETENSKAP Teknisk materialvetenskap Övrig teknisk materialvetenskap; shape rolling; wire rod rolling; artificial defects; defect evolution; surface cracks; porosity; FEM; high speed steel; stainless steel; Initiering och utveckling av defekter under spårvalsning;

    Abstract : Very often defects are present in rolled products. For wire rods, defects are very deleterious since the wire rods are generally used directly in various applications. For this reason, the market nowadays requires wire rods to be completely defect-free. Any wire with defects must be rejected as scrap which is very costly for the production mill. READ MORE

  3. 3. Vibrations induced by surface roughness in nonlinear rolling contacts

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Oskar Erik Lundberg; KTH.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rolling contact; nonlinear contact; contact stiffness; contact filter; state-dependent method; relative displacement; wheel-rail contact; Farkostteknik; Vehicle and Maritime Engineering;

    Abstract : For efficient transportation in either trains, busses or passenger cars, rolling elements such as wheels, tyres, bearings and transmission elements are fundamental. The energy efficiency and the generation of noise and vibrations in rolling contacts depend on the surface roughness of contacting bodies. READ MORE

  4. 4. Surface and Inner Deformation during Shape Rolling of High Speed Steels

    University dissertation from Stockholm : KTH

    Author : Kristina Nordén; KTH.; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Chemical engineering Metallurgical process and manufacturing engineering Metallurgical manufacturing engineering; TEKNIKVETENSKAP Kemiteknik Metallurgisk process- och produktionsteknik Metallurgisk produktionsteknik;

    Abstract : Shape rolling is a common manufacturing process used to produce long products i.e. bars and wire. One of the problems that might occur during rolling is defect formation leading to rejection of the finished product. READ MORE

  5. 5. Closed-die forging and slab hot rolling with focus on material yield some industrial problems analysed by FEM

    University dissertation from Stockholm : KTH

    Author : Esa Ervasti; KTH.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material yield; Closed-die forging; Hot rolling; Cracks; Macro-inclusions; Steel; FEM; TECHNOLOGY Industrial engineering and economy; TEKNIKVETENSKAP Industriell teknik och ekonomi;

    Abstract : The thesis is focussed on improving the material yield in closed-die forging and rolling. The former is restricted to the manufacturing of heavy crown wheels and front axle beams and the latter to the hot rolling of steel slabs. To enhance the yield the commercial FE-codes Form2D and Dyna3D are used. READ MORE