BLANK FEEDING METHOD

摘要

A method of feeding a blank(31)for plastic working by cutting a billet(11),comprising the steps of assembling a tubular jig(12)by stacking a plurality of ring−shaped members(15 to 18)having a coefficient of linear expansion smaller than that of the billet and an inner diameter slightly larger than the outer diameter of the billet,inserting the billet into the assembled jig,heating the billet and the jig to a temperature at which the billet is semi−molten,and cutting the billet to at least one blank by moving the adjacent ring−shaped rings in the directions opposite to each other,whereby a production cost can be reduced since a cutting tool is not required for cutting the billet and,accordingly,the wear of the wedge of the cutting tool is not produced,a productivity can be increased since the billet can be cut into a plurality of pieces at a time and,since the blank can be fed together with the ring−shaped members,the blank need not be re−heated and,accordingly,the productivity can be increased.