Cutter Designed for Roughing in Face, Profile Milling Operations

Sandvik Coromant has launched a new milling concept — the CoroMill MR80 — primarily designed for challenging roughing operations in a wide range of face and profile milling applications in steel and stainless steel. The MR80 is also recommended for tool steels. Hardened tool steels are not a primary use example, but are still applicable for the MR80 cutting tool.

CoroMill MR80 is a double-sided round insert concept with 12 indexing possibilities, higher than regular round insert cutters, meaning more parts for each set of inserts, higher table feed and increased productivity. It is ideally suited to low depth of cut up to 3 mm. While originally designed for machining cast stainless steel components, the product has been further developed to cater to steel milling applications, which require the security of a round cutting edge — such as in mold and die when face and pocket milling mold bases. 

“The round cutting edge is considered to be the most secure edge for challenging materials as well as tough cutting conditions,” says Sangram Dash, global product application specialist for indexable milling tools at Sandvik Coromant. “Furthermore, the shim offers additional security for the cutter body, protecting against coining deformation and machining accidents, while also securing the insert in the tip seat by restricting micro-movements during cutting.”

With its lightweight cutting geometry, it is also possible to use CoroMill MR80 for difficult machining situations, even with long overhangs. “Often, in mold and die applications, the cutter must go deep into the mold cavity, mounted on a long adaptor,” says Dash. “In both cases, the cutting forces must be limited so that vibration can be avoided. Although CoroMill MR80 is a double-sided negative concept, it works with fairly low cutting forces and is a suitable solution for such applications.”

The CoroMill MR80 assortment offers cylindrical and arbor cutter bodies, with diameters from 32-100 mm, 3-12 cutting teeth, and even pitch and shim protection. All cutter bodies feature internal coolant supply. The double-sided E-L50 inserts offer true and easy indexing (6 + 6), with a 3-mm recommended depth of cut.