TOOL BREAKING DETECTOR

PURPOSE:To obtain a detector applicable on a super high speed spindle for such as static pressure air bearing by constituting such that the breaking is detected from the droppage of rotary speed detected in contactless under application of torque between the spindle of machine tool and the spindle b...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	ISHIBASHI KOJI, KODA SEIDO, TATEISHI TAKAYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING MACHINE TOOLS MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PHYSICS TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a detector applicable on a super high speed spindle for such as static pressure air bearing by constituting such that the breaking is detected from the droppage of rotary speed detected in contactless under application of torque between the spindle of machine tool and the spindle body. CONSTITUTION:The rotary speed under machining of work is fed as a speed signal V from a position detector 5 through frequency/voltage converter 7 to a subtractor 8 to calculate the difference between the referential output V0 under no- load rotation thus to obtain the speed variation DELTAV due to load operaton. The speed variation DELTAV is compared with the threshold Vr in a comparator 9. Exceeding of the speed variation DELTAV over the threshold Vr is considered to be breaking thus to stop the machine. With such arrangement, highly accurate detection is realized even for the super high speed spindle such as static pressure air bearing.