The Structure and Bonding of Highly Stressed Vitrified Bonded Cutting Tools, Aufbau und Bindungsmatrix hochbeanspruchter keramisch gebundener Zerspanungswerkzeuge
Vitrified bonds consist of clays, kaolins, feldspas, frits and other additives. Depending on the bond type, the firing process, the requirements of the grinding task (characterized by the grinding process, grinding machine and workpiece to be machined), the abrasives, the rotation speeds and firing temperatures, the ratio of these components can be varied and modified according to specific requirements. Characteristic criteria for the different bond types – which like fused bonds possess a glassy character-, or which like the sintered bonds possess a porcelain-like character – are the so-called sinter point and hemispherical temperature (HKP), which can be determined with the help of a heating microscope. Practical examples will be given illustrating how considerable improvements in effectivity can be achievd by the modification of the bond matrix to correspond the specific requirements of the grinding task.