The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2002
Filed:
Sep. 08, 2000
Yoshiaki Kakino, Sakyo-ku, Kyoto 606-0024, JP;
Makoto Fujishima, Yamatokoriyama, JP;
Hisashi Otsubo, Okayama, JP;
Hideo Nakagawa, Itami, JP;
Yoshinori Yamaoka, Aichi, JP;
Torao Takeshita, Tokyo, JP;
Other;
Abstract
A control method for an NC machine tool is provided which ensures a high precision of the contouring control, and allows for extension of the drill life, and reduction in machining time. The control method comprises: generating an operation command signal on the basis of the machining program and a time constant; generating a velocity command signal by multiplying a deviation of a present position signal fed back from the feed drive system ( ) from the generated operation command signal by a position loop gain; generating an electric current command signal by multiplying a deviation of a present velocity signal fed back from the feed drive system ( ) from the generated velocity command signal by a velocity loop gain; and controlling a drive motor of the feed drive system ( ) on the basis of the generated electric current command signal for driving thereof, wherein a machining mode is determined from the machining program and, if the machining mode is a drilling mode, at least one of the operation command signal, the velocity command signal and the electric current command signal is modified when the feed drive system ( ) is driven to be retracted opposite to a drilling feed direction.