New Chipbreakers From Tungaloy Improve Machining Stability

Tungaloy says it developed its new CBN inserts with HP-style chipbreaker to ensure good chip breaking and control during finish machining of hardened steel parts. The inserts are now available in a double-sided WavyJoint style that reportedly provides maximum tool reliability and stability.

According to Tungaloy, HP-style chipbreakers are developed to guarantee superior chip control during hard part turning at 0.2 mm (.008″) or lighter depth of cut. They are designed with an optimal distance between the cutting edge and the chip redirector, which is said to minimize crater wear development on the rake face for maximum tool life and also lighten cutting forces during machining, eliminating chatter marks and part scraps for improved machining stability.

20 new inserts in HP-style chipbreaker are now available in WavyJoint style, including 4QS-CNGG1204..-HP, 4QS-DNGG1504..-HP, 6QS-TNGG1604..-HP and 4QS-VNGG1604..-HP inserts. According to the company, CBN cutting tips are conventionally brazed onto the seats ground, usually on one side, on a cemented carbide insert body to form a CBN insert. The WavyJoint technology reportedly enhances the bond of CBN cutting tips on negative inserts with 160% increased brazing surface between the CBN tip and carbide insert body. Also, the technology uses 200% larger volume CBN tips for improved insert reliability and tool life. In addition, CNGG1204..-HP inserts are also available in wiper geometry, increasing surface finishing quality.

Two insert grades are available: BXA20, which covers continuous to interrupted cuts at low- to medium-cutting speeds, and BXA10, which is said to demonstrate exceptional wear resistance in continuous cuts of hardened steel, providing reliability and long tool life.