What are superaBrasivs?
Superabrasives was used to describe new possibilities for cutting tools based on polycrystalline diamond (PCD) developed by General Electric (GE) in the US in the 70s. These very hard, fragile compounds have been an improvement in grinding and cutting tools, although they required new techniques for proper use. The materials are thus hard, only to form cutting tools from these compounds can only be used by diamond cutting wheels.
For one material that polish the other, the first material must be heavier than the other. Hardness is a semi -formitative value and refers to the overall ability of the material to avoid breaking when using force. Hardness is usually associated with the use of roughness and long -term life. The materials used in critical parts have grown more harder and more resistant to abrasion as an improvement in metal alloys and bimetallic structures have been developed. These parts must be machined to the specification to meet the maximum authentication ST, FormoIt is inadequate.
Since the metal parts were stronger, heavier Tooool cutting materials, including carbon tool steels, high -speed steel and cast alloys, were developed. Ceramics based materials, as well as cemented carbides and cermets, were also used. The introduction of superabrasiv has greatly expanded the possibilities available for tool creators.
GE PCD Superabrasives consists of micron-size-3.3 × 10 -6 or 1 × 10 -6 meter-diamond layer associated with a carbide substrate. PCD is a synthetic diamond consisting of multiple crystals. During grinding, these crystals break down and leave sharp edges to continue polishing. Clean edges Broken particles clean the grinding surface easier and prevent surface connection. This self -cleaning attribute makes it possible to operate grinding at higher speeds, Redusces ElectricThe load and produce less heat.
nitride polycrystalline cubic bory (PCBN) is a similar class Superabrasiv, which replaces the crystals of cubic boron crystals for diamond crystals. PCD is used for non -aluminum and copper, and for organic materials such as plastics, rubber compounds and wood. PCBN materials are used for iron applications such as gray cast iron. In both types of superabrasifs, the agent is important for performance by which the agent is associated with the substrate. It seems that the displayed binding in many applications is better than metal or resinous bonds that show the top surface treatment of metal binding substances and aggressive cutting of resinous substances.
If you want to use superasive cutting tools, new techniques had to learn tool creators. Previously successful combinations of feed speed and wheel speed would not create quality products. As a result, Brinding New Machinery has developed and processes for working with new materials.
PCD and PCD cutting tools can be grounded by harder materials. The diamond wheels themselves are able to grind superabrasivs. The wheels must be carefully specified in terms of diamond type, crystal size and freezing to make these super hard materials effectively crush.