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Walter has expanded its line of Walter Titex X·treme DM micro drills with eight new models, in drilling depths ranging from 2xD to 30xD. Thanks to advances in carbide technology, special coatings and design, these drills are able to outperform conventional micro drilling tools, the company says.
Traditionally, gun drills have been predominate over twist drills in micro drilling (such as drilling holes with 3-mm diameter or less) applications. Because of micro drilling’s high toughness requirements, twist drills could only be manufactured from high speed steel (HSS). As a result, cutting speeds and feed rates were low, the holes had to be constantly cleared of swarf, and process reliability left much to be desired. However, special carbide grades with a high level of toughness are now available, which allow the manufacture of thin, long twist drills capable of high cutting parameters.
Walter has equipped its X·treme DM line of micro drills with many features, prime among them being internal cooling.
The micro drills are designed to drill a hole in one operation without pecking, which is another factor in their process reliability. Features and benefits like these combine to deliver productivity increases in the 50 to 100 percent range.
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Already available for use with CoroMill 390, CoroMill 490 and CoroMill 495 shoulder and chamfer milling systems, this expansion of the application area makes the benefits of Zertivo technology, such as long tool life and secure machining, available to a wider user profile, the company says.