Drill insert offers optimised cutting edge integrity

20th October 2015
Posted By : Jordan Mulcare
Drill insert offers optimised cutting edge integrity

Sandvik Coromant has launched a reinforced variant of its CoroDrill 880 indexable drill that will substantially improve production economy in large diameter hole-making applications. The latest CoroDrill 880 tool body is compatible with a range of insert grades, including a grade based on the company’s latest Zertivo technology, which delivers optimised cutting edge integrity.

Representing the latest breakthrough in U-drill evolution, the reinforced CoroDrill 880 features a recent enhanced drill body that is up to 30% stiffer than its predecessor for applications of four to five times the drill diameter. This gives a more reliable drilling experience and a much better hole quality. In addition, the combination of enhanced drill body and the recent Sandvik Coromant grade chain for steel and cast iron results in a considerable improved insert tool life.

In tests, a customer manufacturing slewing rings for the wind power industry tried the new and improved tool body for CoroDrill 880 in application requiring holes of five times the drill diameter. When using the old tool body in 42CrMo4, the hole size decreased over time providing an undersized hole after a period of use. With the latest, stronger tool body, CoroDrill 880 produced correctly sized holes for a much longer period of use. In addition, the customer saw a tool life increase of 975%.

Two of the insert grades, GC4324 and GC4334, are designed with Inveio coating for better wear resistance. The third, GC4344, produced with Zertivo technology, provides great edge-line security as a result of optimal coating and substrate adhesion properties.

These three grades complete the full grade chain with solutions for all ISO P and ISO K materials and a large variety of applications GC4324 productivity booster for stable conditions, GC4334 a first choice for good to average conditions and GC4344 which has excellent performance in difficult conditions.

The recent grade positioning is designed to make it easier to select the right grade from the start. The CoroDrill 880 product range covers hole diameters from 12 to 84mm off the shelf, as well as engineered solutions up to 129mm. The drills produce holes with tolerances of H12–13 and are suitable for holes up to five times the drill diameter.


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