Tungsten Carbide Reamer Ⅺ

In part 10 we know that the tungsten carbide reamer called tapered reamer non precision is used for enlarging a hole or riding of burs on softer metals non-precisely with a cross handle and tapered to tip body and it is commonly applied to MRO work. Here below with several parts we with explain how the process variables affect the reaming effect.

To achieve highly accurate and consistent diameters with a tungsten carbide reamer, one must consider process variables that can influence the overall quality of the hole being reamed. Variables such as reamer material, reamer design, material being reamed, temperature at the reamed surface, reamer speed, machine or operator movement, etc. must be addressed. By controlling these variables to the best extent possible, the reaming process can easily produce highly accurate and consistently sized holes. Reamers should not be reversed in use as this will tend to dull the cutting edges.

Size – accuracy and repeatability

The final hole size that is achieved by a tungsten carbide reamer subsequently depends on the reaming process being used in conjunction with the reamer design and materials involved. Studies have been conducted which demonstrate the effect of coolant use during reaming. The continuous use of a coolant stream during the reaming process has been shown to consistently (75% of the time) result in hole sizes that are 0.0001 in. (0.0025 mm) larger than the reamer itself, with a process spread of +/- 0.0002 in. the remainder of the time. Similarly, using a semi-wet reaming process often results in hole sizes that are 0.0004 in. larger than the reamer itself, approximately 60% of the time, with a process spread of 0.0006 in. favoring an increase in size. Dry reaming should be discouraged due to its low level of repeatability (20%) in size and wide process spread of sizes up to 0.0012 in. (0.030 mm) larger than the reamer size.

(To be continued. This article is divided into several parts and this is part 11, for part 10 please refer to http://news.chinatungsten.com/en/tungsten-information/79659-ti-10186;for part 12 please refer to http://news.chinatungsten.com/en/tungsten-information/79704-ti-10192)

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