In last part we revealed that cemented carbide drill bits, as a sort of carbide cutting tools, shall be used following such correct points as choosing right machine tool, right tool holder of bits, and execute proper cooling process. This part we will talk about the another point we shall pay as much attention to as above.

 

4. Correct drilling practice

The drilling practice is also important to the correct use of cemented carbide drill bits.

4.1 Don’t drill when the drilling surface angle > 8°; If the drilling surface angle <8°, the feed should be reduced to 1/2~1/3 of the normal.

4.2 When the drilling surface angle>5°, the feed should be reduced to 1/2~1/3 of the normal.

4.3 When drilling the cross holes, the feed should be reduced to 1/2~1/3 of the normal. Three-wing bit is the best choice.

4.4 Two-wing cemented carbide drill bit can not be used for reaming, which will make the drill bits work incorrectly. Three-wing bit can be used for reaming.

 

In a word, all the cemented carbide drill bits should be correctly used according to the actual condition of the work pieces, just in order to realize their potential capabilities, maximum the efficiency and therefore save the cost.

 

 

(This article is divided into 2 parts, and this is Part 2.For part 1, please refer to:http://news.chinatungsten.com/en/tungsten-information/78805-ti-10036)

 

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