Thread forming fasteners for ultrasonic load measurement and control
First Claim
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1. A method of measuring a load in a fastener, comprising the steps of:
- providing a thread-forming fastener including a head for engagement by a tool for applying a torque to the fastener, and a body portion extending from the head and including thread-forming portions;
coupling an ultrasonic transducer with the fastener, for making ultrasonic load measurements in the fastener;
electrically connecting an apparatus to the ultrasonic transducer for supplying signals to the ultrasonic transducer and for receiving signals from the ultrasonic transducer;
monitoring the signals received from the ultrasonic transducer, providing an accurate measurement indicative of the load in the fastener;
adjusting the measurement indicative of the load to compensate for effects of heating of the fastener resulting from forming a thread in a mating component during installation; and
imparting torque to the fastener and removing torque from the fastener in response to the measurement of the load in the fastener.
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Abstract
An ultrasonic load measurement transducer is mated with a thread-forming fastener to provide a load indicating thread-forming fastener that can be used for the precise and reliable assembly of critical bolted joints, such as those in the automobile and aerospace industries, among others. Steps can then be taken to accurately measure and control the load in the thread-forming fastener during tightening, and to inspect the load in the thread-forming fastener after assembly. A similar result can be achieved for a thread-locking fastener by mating an ultrasonic transducer with the thread-locking fastener assembly.
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Citations
22 Claims
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1. A method of measuring a load in a fastener, comprising the steps of:
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providing a thread-forming fastener including a head for engagement by a tool for applying a torque to the fastener, and a body portion extending from the head and including thread-forming portions; coupling an ultrasonic transducer with the fastener, for making ultrasonic load measurements in the fastener; electrically connecting an apparatus to the ultrasonic transducer for supplying signals to the ultrasonic transducer and for receiving signals from the ultrasonic transducer; monitoring the signals received from the ultrasonic transducer, providing an accurate measurement indicative of the load in the fastener; adjusting the measurement indicative of the load to compensate for effects of heating of the fastener resulting from forming a thread in a mating component during installation; and imparting torque to the fastener and removing torque from the fastener in response to the measurement of the load in the fastener. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring a load in a fastener, comprising the steps of:
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providing a thread-locking fastener assembly including a bolt having a head for engagement by a tool for applying a torque to the fastener assembly and a body portion extending from the head, and a nut for cooperating with the body portion of the bolt, wherein portions of the fastener assembly include resistance-inducing threads; coupling an ultrasonic transducer with the bolt, for making ultrasonic load measurements in the fastener assembly; electrically connecting an apparatus to the ultrasonic transducer for supplying signals to the ultrasonic transducer and for receiving signals from the ultrasonic transducer; monitoring the signals received from the ultrasonic transducer, providing an accurate measurement indicative of the load in the fastener assembly; adjusting the measurement indicative of the load to compensate for effects of heating of the fastener assembly resulting from prevailing torque associated with the thread-locking fastener assembly; and imparting torque to the bolt and removing torque from the bolt in response to the measurement of the load in the fastener assembly. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification