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Träfflista för sökning "WFRF:(Bjurstam Peter 1959 ) "

Sökning: WFRF:(Bjurstam Peter 1959 )

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  • Bjurstam, Peter, 1959- (författare)
  • Skärkrafter vid fräsning : teori och verklighet
  • 1994
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis deals with the machining method milling and the forces affecting the tool during a milling operation. A survey of different tool geometries and conditions of the tool engagement during a machining process is presented. The general cutting theory and the equations used to estimate the load are explored. For practical use this simplified approach may be enough but when a more precise calculation of the load condition are required, i.e for process control or research when the varying chip thickness must be taken into consideration, the general theory is not adequate.As a result of the research work an accurate mathematical model and a computer software has been developed at the Division of Production Engineering. The model calculates the cutting forces acting on the tool during one revolution. The stepsize is one degree. The forces are expressed according to a coordinate system with its origin in the center of the tool. In order to evaluate the software the calculated values have been compared with real forces recorded during machining. The reliability of the equipment and of the developed model has been verified.Different ways for further development of the software have also been investigated. These developments are based on tool life studies made at the Division. One of the applications presented in the thesis is related to the working material. Equations for calculation of the material parameters needed are developed and the structure for a new computer software for the calculations is shown. The presented results can simplify the development of adaptive control modules and improve process planning routines associated with numerical programming of machine tools.
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