SHEARING METHOD OF BILLET CONTAINING UNSOLIDIFIED PART

摘要

PURPOSE:To increase cutting capacity for a billet by forming the cutting edge shape of upper and lower indenting tools constituted of parted shearing tools and complementing tools into a specific are shape and subjecting the billet to indenting to a specific ratio then shearing the ingot by shearing tools. CONSTITUTION:The half-split shearing tools and half-split complementing tools which are bisected are joined to constitute respectively the upper and lower indenting tools. The cutting edge shape of these upper and lower indenting tools is made into the arc shape of which the radius at the top end thereof is about >=40% of the thickness of the billet. The billet is indented down to 20% of the thickness by using said tools, then the remaining wall thickness is sheared by the upper and lower half-split shearing tools. High press is thus executed with the same press capacity.