Diamond Coated Machine Tooling Essay Example

involves forming the particles into a dense sintered material using a binder made from cobalt. These cemented compacts are then brazed into various shapes and brazed onto solid carbide tool bodies.The PCD tools edge can then be ground down to a finished shape and even reground for tool sharpening purposes. PCD tools are over 50 years old and are prevalent in the aerospace industry for drilling rivet holes into carbon fiber composite materials.

The automotive industry also uses these tools for machining of aluminum composites which contain high silicone content. These tools can be expensive, but are often the best option for very high precision cuts and high impact loading. CVD Diamond Tools The main focus of this paper will be on CVD tools.Using CVD technology, diamonds are actually grown onto the surface of a machine-tool substrate.

For this process to be successful, careful attention must be paid to the substrate material selection. The process requires prolonged exposure to high temperatures so tungsten-carbide or ceramic tooling substrates are preferred. For optimum coating adhesion, C-2 grade tungsten-carbide must be used. Also, the parts must be carefully prepared before attempting the CVD process. Typically, the parts are cleaned thoroughly, and then put through a 2-step chemical preparation process.

Cutting forces, microscopic evaluation of cutting edges, and tool life were the parameters used to compare the different tool materials with the above-listed fixture and at the above-listed machining conditions. The two different feed speeds were selected to simulate different tool loading and a single spindle rpm. Wear Characteristics The tool flank wear was measured by use of an SEV microscope to examine the cutting edges.