On the Cutting Mechanism of Coal

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  • 石炭の切削機構について
  • セキタン ノ セッサク キコウ ニ ツイテ

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Abstract

In this paper, the authors studied on the cutting mechanism of brittle materials as gypsum, cement, rock coal blocks.<BR>Results obtained from these experiments are as follows Type of cutting mechanism changes from shear type to crack type as depth of cut and brittle index (ratioof compressive and tensile strength of material defined by the authors) increases, with larger fluctuations in cutting resistance.<BR>2 Fluctuation in cutting resistance decreases as bit width increases.<BR>3 Distance of peaks of cutting resistance increases as rake angle of bit decreases.<BR>4 Cutting resistance of brittle materials in practical cutting conditions may be concluded as the press-in resistance of cutting edge.<BR>5 When cutting brittle materials, tensile stress in the case of larger rake angle bit and shear stress in the case of smaller rake angle bit, takes the.most important role in cutting breakage occurance.

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