Patents Assigned to KB WIBRA
  • Method and apparatus for monitoring the tool status in a tool machine with cyclic machining
    Patent number: 4558311
    Abstract: The vibration level (a) is measured and applied to controllable filter (F). The filter (F) is a band pass filter that only passes a narrow band around a certain frequency that is determined by the frequency (1) of the machining cycle. The output signal of the filter is then compared to one or several reference levels (7) and an alarm signal is outputted in case of unacceptable deviation from the reference level.
    Type: Grant
    Filed: December 10, 1982
    Date of Patent: December 10, 1985
    Assignee: KB WIBRA
    Inventors: Roland Forsgren, Gunnar Garpendahl, Hans Eriksson, Bengt Wallentin