SPK WURBON® Cutting Materials with low CBN Content
Top grades for hardened steel materials
For hard turning of steel materials featuring a hardness of up to 68 HRC, grades with CBN contents of approx. 45–65 % are recommended. Such properties are: high resistance to wear and high material and red hardness in combination with high compressive strength and chemical stability these properties have a substantial effect on the quality of the workpiece. The tool life and the surface quality achieved substantially depend on the inserts cutting edge.
Applications of the SPK-WURBON® grades with low CBN content
Einsatzgebiete von SPK-WURBON® beim Hartdrehen (50–68 HRC)
WBN 575
represents a high-performance grade with excellent wear resistance. Owing to its fine-grained structure, this grade particularly allows for complying with the highest demands in respect of surface quality and dimensional accuracy. It is mainly used for hard turning performed with continuous cutting and high cutting speeds under stable machining conditions. The ideal cutting speed rang for this grade is vc = 140-250 m/min.
WBN 570
is suited for a wide range of hard machining applications owing to its balanced combination of toughness and wear resistance. It is suited for hard turning performed with continuous cutting, and for machining operations performed with moderate interruptions. For this grade, the ideal cutting speed ranges at vc = 120-180 m/min.
WBN 560
is particularly suited for hard turning performed from light to moderate interruptions or under unfavourable machining conditions in continuous cutting. It is used with cutting speeds of vc = 100-160 m/min.
WBN 555
is the top grade for machining operations on hardened steel performed with highly interrupted cuts and using a cutting speed of vc = 80-160 m/min. It is also used for machining of sintered steel and hard metals.