Types ofceramic cuttingtools

CVD coating is also used for cemented carbide tools, but the coating components and formulations are customised specifically for ceramic tools.

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The raw materials, powder and water, are mixed and pulverised by a ball mill (grinder). The process of creating a homogeneous fine-grain material makes the later firing process easier. This stage is important for making hard and strong ceramic tools.

Professionalceramic cutting tool

By heating the pressed shapes, (aggregates of ceramic powders) the ceramic particles adhere to each other reducing the gaps and thereby solidifying and hardening the insert. To make ceramic tools that can withstand high-speed machining, it is essential to manage sintering temperature and time more finely than cemented carbide tools. This process produces hard, strong ceramic tools and also changes the colour of the material due to a chemical reaction between the insert components.

Powder is packed into a mold to which high pressure is applied to form inserts. A pressing force of 1 – 2 tons/cm2 is applied in order to solidify the ceramic powder. To put it into perspective, this would be equivalent to a hippopotamus stepping on the insert mold. Ceramics have a lighter specific gravity compared to cemented carbides. So, using the carbide pressing process would result in cracks and distortions of the ceramic after sintering. Therefore, the pressing process is exclusive to ceramic tools. The insert pressing process compacts the ceramic material, but there are still gaps between the particles and the inserts are fragile. The process then moves to the firing stage.

Ceramic cuttingtools are made of

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Hot air is blown onto the material mixture from stage ① which causes the fine grains to coalesce into larger round forms. This makes it easier to press the mixture in a later process and create ceramic inserts in various shapes.

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UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads are the choices for the customary screws and nuts. The flank angle is 60°.