Method and an apparatus for controlling stress in a member and a

Details Method and an apparatus for controlling stress in a member and a Method and an apparatus for controlling stress in a member and a

1987-12-10

1993-08-17

Rosenbaum, Mark

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

173 1, 29407, B23Q 500

Patent

active

052360520

ABSTRACT:
Proposed is a method and an apparatus for controlling stress applied to a fastener member or the like by a fastening tool by detecting an elastic wave generated in the member as the stress, for instance in the form of an axial force, is applied thereto and by activating the fastening tool according to the detection results. Since the elastic wave or the acoustic wave accurately reflects the internal state of stress in the fastener member, a very precise control of the stress in the fastener member is made possible. If a plurality of vibration sensors are used, an exact identification of the source of elastic wave can be made and the measurement accuracy can be improved. When an indicator member having a property to emit a pronounced elastic wave is attached to the fastener, it is possible to freely adjust the target axial force as desired.

REFERENCES:
patent: 4333220 (1982-06-01), Aspers
patent: 4347024 (1982-08-01), Coldren
patent: 4554980 (1985-11-01), Doniwa
patent: 4686859 (1987-08-01), Wallace
patent: 4709182 (1987-11-01), Wenske et al.
patent: 4730254 (1988-03-01), Voden, Jr.

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