Working Characteristics of Coil End with Abrasive Cut-off Wheel

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In this paper, we describe an experimental study of characteristics: surface condition and working accuracy: of coil end, when a series of cold wound coil spring are cut off with abrasive cut-off wheel. The summary of the experimental results is shown below.(1) As cut-off feed speed increases, cut-off wheel wear amount does in proportion to it. But cut-off wheel which abrasive wear amount is lowest is A100N.(2) Burn mark and burr which are producted in coil end when a series of cold wound coil springs are cut off, are removed in heat treatment and shot peening.Cut-off wheel which is applicable for these conditions is WA100J.(3) Inclination of coil outside face belongs within 2nd class of JIS B2707. And using WA100J cut-off wheel, the number of coil springs in less than 1st class of JIS B2707 increases.
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