MEX 2017 New six-edged milling
Horn has developed the DA62, a new milling system for corner, face and plunge milling. This system uses a six-edged indexable insert. Both sides of the insert can be used and it has three axial and radial cutting edges on each side.
According to Horn, the precision-ground, trigonal insert has a large core cross-section for maximum cutting length. The design of the cutting edges produces a positive cutting geometry despite the negative insert angle. The DA62 system can also be used for roughing and finishing. Selecting the axial and radial angles has enabled a lower torsional moment and lower transverse loading of the spindle to be achieved compared with previous systems. This allows the DA62 to be used on less powerful machines. A further advantage of the selected axial angle is its ability to remove chips, particularly in helical plunge milling.
The cutting edge shape generates a precise 90° corner angle with a maximum cutting depth of 4.5 mm. The inserts are currently available with corner radii of 0.4 mm and 0.8 mm. They are made of the carbide substrate SA4B, which is an all-rounder for milling steel, stainless steel, cast iron and aluminium. The inserts are also available in SD6A, well suited for machining cast iron. Both carbide grades are held in stock.
The milling bodies are available in diameters of 20, 25 and 32 mm, with a Weldon toolholder (DIN 1835 B) or as a screw-in milling cutter. In these variants, the tools are equipped with two, three and four inserts. The tools are available as arbour milling cutters (DIN 8030 A) with cutting edges of 40, 50, 63 and 80 mm, equipped with five, six, eight or ten inserts. All bodies have internal cooling directed at the cutting point.| bj