Tungsten Carbide Reamer Ⅸ

In part 8 we know that a shell reamer is designed for reaming bearing or the similar with full length flutes, while a morse taper reamer is applied to finish morse taper sleeves which includes finishing reamers and roughing reamers. Here we explain combination reamer as another kind of tungsten carbide reamer.

A tungsten carbide combination reamer has two or more cutting surfaces. The combination reamer is precision ground into a pattern that resembles the part’s multiple internal diameters. The advantage of using a combination reamer is to reduce the number of turret operations, while more precisely holding depths, internal diameters and concentricity. Combination reamers are mostly used in screw machines or second-operation lathes, not with Computer Numerical Control (CNC) machines because G-code can be easily generated to profile internal diameters.

Combination reamers can be made out of cobalt, tungsten carbide, or high speed steel tooling. When using combination reamers to ream large internal diameters made out of material with lower surface feet per minute, carbide tips can be brazed onto a configured drill blank to build the reamer. Tungsten carbide reamer requires additional care because it is very brittle and will chip if chatter occurs. It is common to use a drill bit or combination drill to remove the bulk of material to reduce wear, or the risk of the part pulling off on the combination reamer.

 (To be continued. This article is divided into several parts and this is part 9, for part 8 please refer to http://news.chinatungsten.com/en/tungsten-information/79632-ti-10180;for part 10 please refer to http://news.chinatungsten.com/en/tungsten-information/79659-ti-10186)

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