Patent ID: 6257810
Filing Date: 2001-07-10
Classification: B23G,Y10T

Abstract:
Process for thread milling and boring in a work piece, said process comprising:using a thread milling tool having a receiving shank, a milling area with thread milling cutting-edges on pitch-free thread milling teeth at the periphery and a front area with bore-milling cutting-edges, the areas forming the thread milling and the bore-milling cutting-edges having a hard material coating, the thread milling cutting-edges forming an effective cutting angle, the effective cutting angle of the thread milling cutting-edges being negative and the hard material coating in the areas of the thread milling and bore-milling cutting-edges being a wear-resistant layer applied by physical or chemical vapor deposition with a minimum hardness of 2,500 HV, and the milling area with the thread milling cutting-edges being formed of a single piece throughout, the milling area with the thread milling teeth having an outer diameter and the front area with the bore-milling cutting-edges having an outer diameter,and the outer diameter of the milling area with the thread milling teeth being greater than the outer diameter of the front area with the bore-milling cutting-edges, andmaking a forward feed motion with the thread milling tool into the work piece with a circular turning and a rotation at the same time when cutting threads in the work piece, in connection with which the circular turning and the rotation on the work piece are in opposite directions.