Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1989-04-28
1992-05-26
Schwartz, Larry I.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 9, 408 10, B23B 3500, B23B 3900
Patent
active
051161680
ABSTRACT:
In drilling control method and apparatus for making holes through a composite workpiece made of a plurality of materials having different machining properties, the workpiece is first drilled at a feed speed and a rotational speed of a drill which are selected. When the drilling of the workpiece is initiated, the amounts of the feeding speed and the rotational speed are detected by a feed speed sensor and a rotational speed sensor, respectively, and thrust force applied to the drill during the drilling is also detected by a thrust sensor. The detected feed speed and the rotational speed of the drill are compared in a comparison unit with optimum values which are adapted to the detected thrust force. When the detected values of the feed speed and the rotational speed of the drill coincide substantially with the optimum values, the drilling operation is performed, while when the detected values of the speed do not coincide with the optimum values, the feed speed and rotational speed of the drill are changed to the optimum values.
REFERENCES:
patent: 4157231 (1979-06-01), Phillips
patent: 4198180 (1980-04-01), Schultz
patent: 4346444 (1982-08-01), Schneider et al.
patent: 4688970 (1987-08-01), Eckman
patent: 4697964 (1987-10-01), Daiko et al.
patent: 4787049 (1988-11-01), Hirata et al.
patent: 4854786 (1989-08-01), Alexander et al.
patent: 5022798 (1991-06-01), Eckman
Fuji Jukogyo Kabushiki Kaisha
Schultz R.
Schwartz Larry I.
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