No abstract

Apart from the conventional theory of the minimum-cost or maximum-production cutting speed, a new concept of the machining conditions for maximizing the profit for the manufacturing enterprise was presented. A Concept of the Maximum-Profit Machining ConditionsGilbert""" and other investigators analyzed the machining conditions for the minimum-cost per piece of products, especially the minimum-cost cutting speed. At this speed, the production cost per piece including idle and loading costs, cutting cost, tool changing cost, tool cost, tool regrinding cost, etc., is minimum, * Department of Precision Engineering.

No abstract

Instead of the conventional theory of the mechanics of metal cutting based on a process of shear confined to a single shear plane, the concept of flow region, a fairly large transitional deformation zone which exists between the rigid region of work and the plastic region of steady chip, was developed. The mechanics of orthogonal cutting was analyzed, theoretical equations for angles of boundary lines of the flow region and for strain in chip were deduced in the case of simple continuous chip formation and confirmed in cutting tests on lead. The concept of flow region was also applied to discontinuous chip formation, and theoretical expressions for angles of boundary lines of the flow region were ascertained to be in agreement with the experimental result for carbon steel.

No abstract