Vibration damping for surface finish improvement

Vibration damping for surface finish improvement

July 29, 2019

MAPAL

https://www.mapal.com/us/
Tooling/Cutting Turning/Milling

Vibration often occurs during machining, leading to dynamic instability of the system, inadequate surface finishes, insufficient accuracy, high machining noises, shortened tool lives, and in extreme cases, broken tools and cutting edges.

Mapal’s vibration damping system in the tool shank suits tools for boring and milling with very long projection length that tend to vibrate due to an inadequate dynamic rigidity of the overall system. Designers studied factors arising from the interaction of the machine tool, the tool, and type of clamping as well as the component. Mapal vibration damping is matched to all common types of machine stiffness. It can be used for machining different materials with different tools.

The self-contained system of auxiliary mass and steel spring packages counteracts the deflection of the tool body and minimizes it. Vibration can be up to 1,000x lower compared to tools without absorber systems. Despite the long projection length, quiet, stable running is achieved. This makes it possible to work at higher cutting speeds and significantly increases the material removal rate.

In addition, significantly better surface finishes are achieved thanks to vibration damping. When milling case hardened steel (16MnCr5), for example with a 250mm long combination of milling cutter arbor and milling cutter with five cutting edges and ISO indexable inserts (diameter 50mm), the Rz value was halved from 7.8µm to 3.9µm for material removal ae of 18mm and ap of 3mm compared to the same tool system without vibration damping.

Milling cutter arbors with vibration damping in the shank are available with internal coolant supply for clamping diameters 16mm, 22mm, and 27mm with a length of 200mm and 300mm for SK40, SK50, HSK-A63, and HSK-A100 connections.