Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1990-10-09
1992-07-21
Echols, P. W.
Metal working
Method of mechanical manufacture
With testing or indicating
29456, 7386223, 73761, B23Q 1700
Patent
active
051311305
ABSTRACT:
A method and apparatus for tightening threaded fasteners to any desired proportion of the way through a torque-angle specification window defined by low and high angle limits and low and high torque limits. The torque rate for the joint is determined from torque and angle measurements taken during tightening and compared to boundary ratios which are determined as the rates of change of torque with respect to angle from a threshold torque to the corners of the specification window. A final target parameter value of either torque or angle is calculated based upon this comparison which is approximately halfway through the specification window along a projection of a torque-angle characteristic curve for the fastener which is determined from the torque rate. Correction factors are also provided for tool overrun depending upon whether torque or angle control is used and a reject rate margin is employed to account for nonlinearities which otherwise may lead to unacceptable assemblies. The upper limits of the specification window are also avoided to prevent the creation of rejects.
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"Quality Assurance and Zero Defects Assembly by Use of Brushless DC Nutrunners for the Tightening of Bolted Joints", by Pantel, Wolfgang E., SME Technical Paper No. AD84-851, 1984.
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Allen-Bradley Company Inc.
Bryant David P.
Echols P. W.
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