軸直角衝撃によるねじのゆるみ試験 : 接合面および被締付部材の剛性の影響

概要

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In transverse impact self-loosening tests for threaded fasteners, rolling contact condition and flexible tension-type load cell have been used instead of metal-to-metal contact condition and relatively rigid clamped parts, respectively. So it is required to consider the effects of abovementioned differences between test and practice in order to utilize the results from conventional tests in mechanical design. This paper aims to clarify the effects of contact condition and of rigidity of clamped parts (or load cell). The testing machine is developed in which contact plane with rolling contact condition and tension-type load cell can be easily replaced by metal-to-metal contact condition and newly developed rigid compression-type load cell, respectively. Averaged preload loss per cycle in steady-state region is selected as an index to evaluate the self-loosening characteristic. The following results are obtained in this study : (1) The critical impact energy at the self-loosening limit is considerably dependent on the contact condition. (2) If the data are arranged by maximum displacement of the plate subjected to impact, the self-loosening characteristics are hardly affected by testing conditions.
公益社団法人精密工学会の論文
1988-01-05