Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Prozeßüberwachung am Spannfutter
    ( 1995)
    Spur, G.
    ;
    Thiel, R.
    The process control of metalcutting production processes requires a knowledge of the spatial and temporal behaviour of the cutting forces. By including the clamping unit into he sensory means required for measuring such forces, it is possible to determine two process values from on sensor signal, namely the cutting and the clamping force. The measurement of forces by using strain control strips is based on the linear dynamic theory of deformation, so that it becomes possible to distinguish the static part of the signal from the dynamic one.
  • Publication
    Dehnungsanalyse zur Sensorentwicklung.
    ( 1994)
    Spur, G.
    ;
    Thiel, R.
    The direct measurement of metal cutting forces by means of force sensors is only feasible in very few cases, as it involves an intervention into the constructive structure of the tool. However, the forces can be determined indirectly via a measurement of expansion at the relative machine components with much less effort. In the following, it is demonstrated how the quality of the required sensor system can be determined even before its production by means of FEM simulations and selected measurements of calibration.
  • Publication
    Parameter optimized strain analysis of machine components for sensor application
    ( 1994)
    Spur, G.
    ;
    Thiel, R.
    Cutting forces are important parameters to describe the manufacturing process. For an adjustment with regard to optimal cutting parameters and minimal tool wear it is necessary to know the quantity and components of the forces. The direct measuring of cutting forces by means of force sensors demands an intervention in the construction of the tool. Therefore force sensors seldom can be applied on working machine tools. On the other hand the indirect determination of cutting forces by measuring strain of machine components is possible without changing the machine characteristic or its construction in many cases. The sensors may be attached on components in the main flux of force or secondary flux of force. The position of tool and workpiece, different workpiece geometry and setting of tools are varying parameters that have a great influence on the deformation of machine components. In the beginning of the development stage of a sensor system these parameters are not known or hardly to es timate. FEM calculations have been done on two examples, a chuck and a revolver, to analyze the behaviour of strain with different loads and geometry. The results of the FEM calculation are implemented into a linear mathematical model as a basis for the development of a sensor system. In this model Hooke's law of material behaviour is assumed for the use of strain sensors. Installed on a chuck this sensor system rotates with the spindle speed. In addition to the cutting forces the influences of centrifugal force and clamping force have to be taken into account. In this case a signal analysis separates static and periodic parts of the sensor signal. It allows the calculation of the clamping forces regarded as static and the cutting force as periodic parts of the sensor signal.
  • Publication
    Messen von Kräften beim Beschneiden tiefgezogener Blechwerkstücke
    ( 1994)
    Spur, G.
    ;
    Pöllmann, A.
    ;
    Thiel, R.
    A measuring equipment for detecting cutting forces and cutting motion at the cutting of sheet steel. At the cutting of deepdrawn work pieces vertical and horizontal cutting force components are appearing. A measuring equipment for detecting horizontal shearing forces at the cutting of blanks gets introduced. By the help of this system new knowledge about the cutting-process can be found.