Helical Flutes Research Articles

On the CAD of Profiles for Cutters and Helical Flutes - Geometrical Aspects

The paper deals with geometrical analysis and with software development for the designing of cutter and grinding wheel profiles. Two methods, the “direct” and the “indirect” allow for the prediction of the helical flute profiles and cutter profiles respectively. Programming was carried out on an IBM PC, and can easily be operated on any other similar system. Results are obtained either as printed data or in the form of plotted profile curves. Both methods can each be run with the results obtained by the other, allowing for the rechecking of the design. Applications are discussed and preliminary examples of program output presented.

エンドミルの逃げ面摩擦による加工精度の変化

This paper deals with the measuring methods of flank wear, receding cutting edge of helical square end mill, the tool life equation and also the relationship between flank wear and accuracy, by end milling. The results are as follows. (1) The applicable measuring method of flank wear and decreasing diameter of helical end mill is given and the measurement is performed. (2) There are two types of flank wear, one is the rectangular type and the other is the rectangular type with the grooved wear. The grooved wear appears in down milling, and becomes bigger as the cutting speed increases. (3) The tool life equations are given with three kinds of tool material in up or down milling for a critical flank wear of 150 μm in the normal direction to the cutter axis. (4) Work accuracy depends upon receding a cutting edge. And the configulation of wear is projected on a side surface of a work. But such a projection rule cannot be maintained due to a grooved of the helical flute.

Helical Taper Reamers Milled With Constant Helix Angle

Abstract The author explains the process of milling helical flutes on a taper reamer so that the flute will have a constant helix angle of 45 deg at every point along the length of the reamer. The problem is solved by the development of a former or master cam cylindrical in shape and bearing upon its lateral surface a helical groove such that, as the cylinder turns on its axis with constant angular velocity, the whole former advances in the direction of its own axis at a controlled but variable feed. The milling cutter is mounted so that its plane forms a constant angle with an element of the taper blank being machined to form the reamer. The advantage of the method described is its adaptability to a quick practical solution either mathematically or by graphical means.