Page 81 - Demo

79BRAZED TOOLSFig. 10.2. Single tube deep drilling head with brazed tipsBrazed tools are regrindable which is not a cheap process. After regrinding the position of the tool%u2019s cutting edge is changed, which demands setup changes. In indexable tools, replacing a worn cutting edge is performed by insert indexing or mounting a new insert. A worn brazed tool is removed from a machine and then sent for regrinding. Therefore, a new tool should be mounted on the machine to continue cutting. With this approach in mind, most companies using brazed tools stock redundant tooling.Nevertheless, the brazed tool concept remains common (Fig. 10.2) especially if the tools are large-sized. In addition, brazing technology is used for fixing tips of expensive ultra-hard cutting material such as cubic boron nitride (CBN) or polycrystalline diamond (PCD) on indexable inserts or solid tools (Fig. 10.3 and 10.4)Fig. 10.3. CBN- tipped indexable turning insertsFig. 10.4. Solid drills with PCD wafer (left) and PCD nib (right) for drilling composite materials