Mitsubishi Materials Corporation announced on April 1, 2016 that it has developed a chemical vapor deposition (CVD) coated superhard material "MC6035" with improved defect resistance. It can be used as a material for blades for steel turning. It can prevent sudden defects under unstable cutting conditions such as intermittent cutting of steel materials, and sudden defects in carbon steel and alloy steel in the low and medium speed cutting range.
The new material mitigates the tensile stress remaining on the coating. Thereby, it is possible to disperse the impact at the time of intermittent cutting, thereby suppressing the sudden defect. In the past, when the product was cut intermittently, the impact was easy to concentrate, and under the influence of the tensile stress, the crack would develop to the depth of the coating, resulting in the occurrence of defects.
This time, titanium carbide (TiCN) was made into a fibrous thick film to improve the wear resistance in the low-medium speed cutting range. In addition, excellent defect resistance is obtained by thinning the surface of the alumina (Al 2 O 3 ) layer.
Mitsubishi Materials has set the new material to the material of the 166 model negative angle inserts. In terms of price, the diamond-shaped insert "CNMG120404-LP" with a cutting edge length of 12.7 mm and a thickness of 4.76 mm is 918 yen (tax included).
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