Effects of Rolling Type, Diameter and Setting Conditions of the Roller Bar upon the Cutting Phenomena in Orthogonal Cutting of Veneer with the Roller bar (I) On Variations of the Cutting Force Acting on the Knife

摘要

In the veneer cutting process, compression and restraint caused by a pressure bar play an important role, but few studies have dealt with their effects upon the cutting force acting on the knife. Therefore, the main purpose of the study reported here was to obtain quantitative information on these aspects. In this study, roller bars with various diameters (D) and of various rolling types were prepared to vary the depth (rt) of restraint by interface between the face of the roller bar and the knife rake-face, the action area of restraint, and the degree of adhesion between the face of the roller bar and the tight side of the veneer. Before cutting, the test specimens were preheated in wather at about 95℃ for 4 hours. White seraya (Parashorea malaanonan Merr.) veneer, 10mm thick, was cut with five rolling types of the roller bars, and the horizontal (FH(K)) and vertical (FV(K)) components of the cutting force (R(K)) were measured. Based on these measurements, their variations under various experimental conditions were clarified. And characteristics of the veneer cutting with each other roller bar are discussed, comparing them with those of the veneer cutting with a conventional pressurs bar.