HM90 ADCT 1505-CF indexable insert signals way ahead for Iscar chatter-free cutting technology
1 min read
Iscar's asymmetric-shape one-sided HM90 ADCT 1505-CF indexable milling insert, which is intended for clamping into the Iscar Heli2000 family of milling cutters, has been designed to offer an effective solution to the problem of chatter. The company says it is capable of achieving excellent results in areas such as shoulder milling when the rigidity of a system is low, in high cutter overhang situations, on thin-walled workpieces and in problematic workholding positions.
Unlike a typical laydown indexable milling insert, which features rotational symmetry of its cutting edges about an axis perpendicular to the insert base, the Iscar HM90 ADCT 1505-CF insert has two helical cutting edges, but their inclination to the base is different. Consequently, when the insert is clamped into a tool, its cutting edges produce various axial rakes. The effect achieved is basically similar to the variable helix angle of the solid endmills, as with Iscar's Chatterfree family, which is effective in the reduction of vibrations during machining.
According to Iscar, its pioneering approach also promises future advances in the area. Development of superior powder metallurgy and advanced pressing technology will deliver additional increases in the height difference between corners of an insert and therefore will further expand the possibilities of changing axial rakes. Moreover, the portions of the rake face adjacent to the cutting edges may have a different topology which also allows the normal rake to be varied.
This, says Iscar, provides a good starting point for the production of extended flute cutters with their teeth formed by a set of inserts. This solution opens up several options for varying the cutter geometry by simply changing the order of mounting the inserts on the pockets. These are a consistent tool axial rake (two versions); an alternating tool axial rake from one flute to another; and a variable tool axial rake along each flute. In addition, changing the rake angle can be combined with the chip splitting shape of insert cutting edges.
The peripheral surfaces of Iscar's HM90 ADCT 1505-CF insert have different colours, gold on one side and black on the other. This usefully provides an indication of edge inclination and also simplifies the process of mounting the inserts in a desired order.
