Abstract
The pattern of blade wear arising in a high speed cropping machine when cropping En8, En31 and En2 are discussed. The wear land was found to be “moon crescent” shaped while the wear profile was either of the “crater” or the “triangular” type. The development of these characteristics and that of the wear volume were monitored over long runs and the resulting deterioration of the billet quality was noted. Means for arriving at an “optimum blade life” are proposed and the results obtained are discussed on the basis of that concept. Blade life depends on the materual cropped, billet size and the tolerance limits of billet quality required. Broadly speaking, tool life obtained at high cropping speeds was of the same order as that customary at conventional speeds, through in the former case a far higher billet quality is obtained.
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