Patent ID: 8215882
Filing Date: 2012-07-10
Classification: B23B,Y10T

Abstract:
1. A helical multilevel milling cutter, comprising a cutter shank and a cutter head which are integrally formed, characterized by that: the cutter head has a flat top surface provided with at least two helical pieces integrally, each helical piece has a cutting blade thereon, a heat emission platform is formed along the cutting blade, a second cutting blade which faces forwardly as viewed in the direction of the cutting operation is formed in front of the heat emission platform, a cutting blade outer surface is formed between the heat emission platform front surface and the second cutting blade, an outer front cutting blade is formed on the top surface of the cutter head at a position where the blade meets the heat emission platform front surface, a front cutting blade is formed between the second cutting blade and the center of the cutter head top surface, a length of the outer front cutting blade is equal to or less than a half of a radius from an outer side surface of the heat emission platform to a cutter axis, a helical positioning platform is formed protruding from the position of the cutter axis to the second cutting blade on the front cutting surface of each helical piece, a perpendicular distance of a side surface of the helical positioning platform with respect to the cutter axis is equal to or less than half of a radius from the outer side surface of the heat emission platform to the cutter axis, and a groove is formed on the helical positioning platform.