oxide (Al2O3) provide the wear resistance needed for steel and cast iron turning and interrupted cuts. Picking the right coating type must take into account
both coating processes and materials. “Chemical vapor deposition [CVD] and physical vapor deposition [PVD] are the two main coating processes for carbide inserts, each one providing interesting features and benefits. For example, CVD coatings are thick [typically 9–20 µm] and highly wear-resistant, making them well-suited for steel and cast iron machining as well as being widely used in turning operations,” said Don Graham, manager of education and technical services, Seco Tools Inc. (Troy, MI). “Unfortunately, however, such thick coatings can compromise edge tough- ness. PVD coatings are thin [typically 2–3 µm] yet tougher and typically smoother than CVD coatings. Consequently, they are useful for machining materials, such as superalloys, titanium alloys, and difficult-to-machine stainless steels that typically notch or chip cutting edges.”
Seco’s DuraTurn coated inserts feature alternate layers of titanium aluminum nitride and titanium silicon nitride for wear resistance in machining hard materials.
c the infi nite RENGAGE™
possibilities of process control
strain gauge technology—for the most accurate probes in the world.
OMP400—Optical transmission strain gauge probe. More details at renishaw.com/omp400
Renishaw’s strain gauge technology offers an unrivaled opportunity to control the variables of process control for small to medium-size machining centers. Reap the benefi ts of automated job set-up, reduced scrap and lower fi xture costs. The unique frequency-hopping feature of the RMP600 maintains radio transmission and control, even in the “noisiest” environments.
• Lower contact forces for less stylus bend and pre-travel