Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1996-12-31
1998-07-21
Chilcot, Richard
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
7386206, F16B 3102
Patent
active
057837511
ABSTRACT:
A cutting force sensor for measuring the variation of cutting force in a cutting machine includes a screw shape body to serve as a locking screw in a turret of the machine. The sensor has a pair of strain gauges at one end of the sensor to measure and detect the cutting force variations of a cutting tool held by the turret and send the signals to a pair of Wheatstone Bridges located at another end of the sensor. The signals are then filtered, amplified and analyzed for monitoring the cutting tool wear and/or breakage condition. The sensor is located close to the cutting point and therefore can generate high S/N (Signal/Noise) ratio and produces more precise measurements. The sensor is of low cost and does not take additional space and can be readily used in an existing machine without requiring expensive structural changes. The sensor also contains a slot opening with a predetermined dimension formed in the bottom portion so as to improve the sensitivity of the sensor without comprising its structural integrity.
REFERENCES:
patent: 4429579 (1984-02-01), Wilhelm
patent: 4526044 (1985-07-01), Mosar et al.
patent: 4553124 (1985-11-01), Malicki
patent: 4674339 (1987-06-01), Hatamura et al.
patent: 4875356 (1989-10-01), Powell et al.
patent: 4924713 (1990-05-01), Machino et al.
patent: 5211060 (1993-05-01), Obrien et al.
Chen Chang-Ming
Hung Spring C.-C.
Maw Hsieh Chi
Chilcot Richard
Industrial Technology Research Institute
Liauh W. Wayne
Noori Max H.
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