Positioning of coiling tool in 2-fingers system.

概要

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In this paper, we describe an experimental study of positioning of coiling tool in cold working methad of helical springs in 2-figers system. The summary of the experimental results are shouwn as follows.(1) Experimental reults agree well with the theoretical results on the assumption that the wire forming curve of the shape of helical compression springs during coiling consists of two circular arcs.(2) Ratio of displacement in two fingers should be kept constantly in order to keep central position of formed springs on the acting line of cutting blade.(3) It is found that contact points between wire and fingers move to a constant direction. Therefore position of two fingers should be hold on the line with a constant angle to a vertical line.
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