Page 446 - THREADING CATALOG

USER GUIDE
GRADES AND MATERIALS
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Cutting Material Grades and Engineering Materials

Tool Material Grades for Indexable Inserts and Solid Tools

The indexable inserts and solid carbide tools for thread production are produced from different tungsten carbide
grades. The grade is defined by a combination of substrate type, coating type and post-coating treatment. If the
indexable insert or solid carbide tool is not coated, then the grade will be defined by substrate type only.
ISCAR’s products for threading are made from cemented carbide. Cemented carbides are very hard materials, and
therefore, can cut most engineering materials that are softer. In most cases, to improve performance of thread cutting
products when applied to machining a specific class of materials, the indexable inserts and solid carbide tools are coated.
One of the most common methods of coating is by physical vapor deposition (PVD). PVD coatings have a wide distribution
in indexable thread turning inserts and thread a solid carbide tools because they leave the cutting edges sharp.
PVD coatings are applied at a relatively low temperature (about 500°C).

Nano Layered PVD Coating
PVD coatings were introduced during the late 1980’s. With the use of advanced nanotechnology, PVD coatings performed a
gigantic step in overcoming complex problems that were impeding progress in the field. Developments in science and technology
brought a new class of wear-resistant nano layered coatings. These coatings are a combination of layers having a thickness of up
to 50 nm (nanometers) and demonstrate significant increases in the strength of the coating compared to conventional methods.

SUMO TEC Technology
SUMO TEC is a specific post-coating treatment process developed by ISCAR.
The treatment has the effect of making coated surfaces even and uniform, minimizing inner stresses and droplets in
coating. In CVD coatings, due to the difference in thermal expansion coefficients between the substrate and the coating
layers, internal tensile stresses are produced. Also, PVD coatings feature surface droplets. These factors negatively
affect a coating and therefore shorten insert tool life. Applying SUMO TEC post-coating technologies considerably
reduces and even removes these unwanted defects and results in increasing tool life and greater productivity.

ISCAR
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