りん青銅ばねの低温焼なまし時間の短縮に関する研究

概要

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Low temperature annealing of helical compression spring using phosphor bronze fine wire is investigated, aiming short time residual stress relieving. In the process of coil spring, it is necessary to relieve the residual stress caused during wire deformation. But, the time for its heat treatment time is very long, for example, 10 minutes to 2 hours. To change this condition, residual stress relieving rate is formulated under the assumption that this stress relieving process is equal to stress relaxation in creep. This is because the both are caused by recovery of metal crystal before recrystallization, explained by dislocation theory. Next, the constants of formula are determined through the experiments, measuring isothermal change of the uniform tensile stress. Utilizing the formula, the short time condition for annealing is found. As the result, in line coiling, annealing, and assembling is made possible.
一般社団法人日本機械学会の論文
2001-10-25