Tungsten Carbide Reamer ⅩⅢ

In part 12 we know that the life of a tungsten carbide reamer can be up to 30,000 holes keeping size quality consistent if used properly and reamers are usually used with a drill press, lathes, machining centers or the similar. And here we explain two categories of materials used to build reamers.

Two materials for reamers

Like other cutting tools, there are two categories of materials used to build reamers: heat treated and hard. Heat treated materials are composed by different steels, most notably plain carbon (unalloyed, considered obsolete today) and high-speed steels. The most common hard material is tungsten carbide (solid or tipped), but reamers with edges of cubic boron nitride (CBN) or diamond also exist.

The main difference between both categories is that hard materials are usually unaffected by the heat produced by the machining process and may actually benefit from it. The down side is that they are usually very brittle, requiring slightly blunt cutting edges to avoid fracture. This increases the forces involved in machining and for this reason hard materials are usually not recommended for light machinery. Heat treated materials, on the other side, are usually much tougher and have no problem holding a sharp edge without chipping under less favorable conditions (like under vibration). This makes them adequate for hand tools and light machines.

 (To be continued. This article is divided into several parts and this is part 13, for part 12 please refer to http://news.chinatungsten.com/en/tungsten-information/79704-ti-10192; for part 14 please refer to http://news.chinatungsten.com/en/tungsten-information/79734-ti-10199)

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