Method for quality checking a screw joint tightening process performed by a torque impulse wrench
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United States of America Patent
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Jun 14, 2011
Grant Date -
Jul 31, 2008
app pub date -
Sep 16, 2005
filing date -
Sep 20, 2004
priority date (Note) -
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Abstract
A number of pre-production calibration tightenings are performed at a screw joint identical to a screw joint used in production and using the same impulse wrench as to be used in production tightening. The value of one or more tightening related parameters are registered at the attainment of the desired pre-tension level, and those parameter values are used to statistically form a basis for a reference set-up. The tightening parameter values registered during production tightening are compared to the reference set-up, and an indication is obtained as to discrepancies between the reference set-up and the actually registered parameter values to get an indication as to whether the impulse wrench is malfunctioning and/or the screw joint is faulty.
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