resilient cutting edge. Both versions of CoroMill Plura HD, the P2BM and M2CM grade variants, use the Zertivo 2.0 technology.
A power cut strategy allows for 70 to 90 per cent radial engagement, enabling around 10 passes at once compared to a HFSM strategy, since HFSM typically employs a radial engagement of 5-10 per cent of the tool diameter. However, it is worth noting that HFSM can be used with very large axial depth of cuts, whereas the power cut strategy has a limit of two times the cutter diameter for axial depth of cut. By using the power cut strategy within its working area, which extends up to two-times the cutter diameter, manufacturers can achieve high metal removal rates while maintaining process stability. The controlled engagement and load ensure the stability of the cutting process, reducing the risk of tool breakage or other issues.
PERFORMANCE TESTS
CoroMill Plura HD and Zertivo 2.0 were assessed in extensive performance tests against competitor’s solid carbide end mills.
One out of many cases where Plura HD has proven its performance is in slot milling a 1.4404 (316L) stainless steel ISO-M component. The M2CM grade CoroMill® Plura HD and competitor’s end mill were run at the same machining parameters: a cutting speed (Vc) of 90 m/min, feed per tooth (fz) of 0.05 mm/tooth, radial width of cut (ae) of 10 mm and axial depth of cut (ap) of 5 mm. In the end, CoroMill Plura HD
exhibited a +65 per cent tool life increase over the competing solid carbide end mill.
Another example is where the P2BM CoroMill Plura HD end mill was put to work against another competing tool on a SS1672 (C45) 160 HB steel ISO-P component, this time to perform the heavy machining application of dry shoulder milling. The following cutting parameters were used: a Vc of 235 m/min, fez of 0.1 mm/tooth, ae of 7.5 mm and ap of 5 mm. In that instance, the P2BM grade CoroMill Plura HD exhibited a tool life increase of +150 per cent.
The performance advantages of CoroMill Plura HD and Zertivo 2.0 are especially beneficial for machine shops in all sectors that are looking to manufacture products more easily, efficiently, and cost-effectively. The standard assortment offers diameters from 2–25 mm, a 2×D depth of cut, 4 to 5 teeth and a ramping angle of 5° or 7°. Overall, the Sandvik Coromant tool was found to achieve a 30 per cent improved tool life and 30 per cent improved productivity, at the same time. This was achieved both for the new stainless steel tools in ISO-M machining and for the steel tools in ISO-P machining. It should be noted that these results were accomplished without applying strategy improvements, such as a power cut strategy that would optimise the performance even further.
MULTIPLIED PERFORMANCE In conclusion, Sandvik Coromant's CoroMill® Plura HD solid carbide end mill is a strong
performing tool that brings large performance improvements also in less favorable operations. The end mill contributes to large improvements both in tool life and in productivity versus competing tools. With its Zertivo 2.0 coating, the product family improves process security, tool life and productivity versus old generation grades and competing tools.
That said, CoroMill Plura HD’s performance can be lifted even higher by applying a power cut strategy. This can improve process security, tool life and productivity even further. By adding a power cut strategy, CoroMill Plura HD’s performance will be multiplied again.
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