Mapal says it has developed a new series of cutting materials for the milling of cast iron that covers the whole bandwidth of grades – GJL, GJV and GJS. This cutting material series includes three PVD-coated carbides and two CVD-coated grades.
According to Mapal a special post-treatment has been developed for both the PVD coating and the CVD coating that ensures a smooth surface and an optimum chip flow. This claims to minimise tribochemical wear. With the CVD coating, the post-treatment additionally sets a selective intrinsic stress in the coating, stabilising the cutting edge or increasing the ductility of the cutting material, says the company.