Article by: Iscar (Thailand) Ltd. & MEGA Tech Magazine
A LOGIQ3CHAM drill body that carries an H3P head has its own specific features. In designing the drill body, ISCAR’s tool engineers faced some difficulties caused by the three-flute concept. The growth in metal removal rate necessitated a proportionate increase in flute volume to ensure an unconstrained chip flow.
However, this was shown to reduce body strength and stiffness when compared with a two-flute design of the same diameter and therefore a non-standard solution was required. Finite element modelling assisted in identifying a solution: a variable flute helix angle, which provides a durable body structure to resist a high axial load and improve the body’s dynamic rigidity. A helical margin prevents chip adhesion between the body and the drilled hole.
The head pocket enables a large face contact surface, which spreads out the pressure during machining. The pocket is designed to avoid plastic deformation and increase heat resistance, so prolonging pocket tool life even in difficult conditions.