Fanuc Corporation

Ryuji Suzuki

Akihiko Fujimoto

Shinya Okamoto

Nobuyuki Suda

A deviation correcting method for a machine tool, which is capable of exactly correcting a deviation of a reference position of a tool with respect to a workpiece without repeatedly executing a measuring operation. The measuring operation includes providing a detector switch SW for detecting an operating end surface of the tool, obtaining a position z when the detector switch SW detects the operating end surface of the tool, and calculating a difference between the detected position z and a reference position z0 to obtain an amount of deviation A. This measuring operation is performed at least three times at an arbitrary time interval. Based on data of these actual measurements, a function f(Ti) of a curve representing a relationship between a time Ti and an amount of deviation A. Then, an amount of deviation A' at an arbitrary time point Ti is estimated using the function f(Ti) to correct a commanded position of the tool. Since the deviation can be corrected by the estimated the amount of deviation A', it is unnecessary to repeatedly executing the measuring operation, thus improving the machining efficiency.

Method of correcting a deviation of a tool position in a machine tool

A machine tool comprises a spindle head (2) having a vertical bore (2a); a spindle (20) provided in said vertical bore (2a) and including a tapered hole (24) at the lower end of said spindle (20); bearing means (22a) provided in said vertical bore (2a) for rotatably supporting said spindle (20); a non-contact sealing means (10a) for sealing the bearing means (22a). The machine tool further comprises a device for preventing a cutting fluid from entering the bearing for the spindle. The device comprises means (6a, 6b) for forming a pressure chamber (6) provided so as to enclose the non-contact sealing means (10a); and means (44) for supplying air to the pressure chamber (6).

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Growing community of inventors

Yamanashi, Japan

Ryuji Suzuki