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  1. Home
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  3. Delcam’s new Vortex toolpath strategy reduced the machining time by 63% for this titanium demonstration component

Delcam’s new Vortex toolpath strategy reduced the machining time by 63% for this titanium demonstration component

17 September, 2013
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Delcam has launched the 2014 release of its PowerMILL CAM system for high-speed and five-axis machining, which includes, as its major enhancement, the new Vortex high-efficiency area clearance strategy. 

Vortex, for which Delcam has a patent pending, has been developed by the company specifically to gain the maximum benefit from solid carbide tooling, in particular those designs that can give deeper cuts by using the full flute length as the cutting surface.  It can be used for two- and three-axis roughing, three-plus-two-axis area clearance and for rest machining based on stock models or reference toolpaths. 

Like other Delcam roughing strategies, Vortex toolpaths are calculated to give more efficient machining by following the shape of the part and by keeping air moves to a minimum.  This is particularly important for rest machining operations.

The benefits of using the Vortex strategy will vary depending on a number of factors, including the material and shape being cut, and the machine tool and cutting tools being used.  A series of trials run by Delcam on different machine tools within its Advanced Manufacturing Facility has shown that a time saving of at least 40% is not untypical, with the biggest percentage savings being found when cutting tool steel on a Huron machine with SGS Z-Carb MD cutters.  The cycle time for the sample part was reduced from 121 minutes to 34 minutes, a reduction of 71%. 

Other examples included a reduction of 67% when cutting a number of pockets in a stainless steel part, a 63% time saving on a titanium part and a 58% saving when cutting an aluminium component. 

One fundamental problem with conventional area-clearance strategies is that the optimum cutting conditions only occur during a straight-line cut.  Any internal corners within the model significantly increase the engagement angle of the cutter.   To protect the cutter, this increase needs to be balanced by setting a lower feed rate.  The user then has the choice of using this lower rate over the whole toolpath, which increases the machining time, or varying the feeds and speeds as the cutter moves around the model and so increasing wear on the cutter.

Unlike other high-speed roughing techniques that aim to maintain a constant theoretical metal-removal rate, the Vortex strategy produces toolpaths with a controlled engagement angle for the complete operation.  This maintains the optimum cutting conditions for the entire toolpath that would normally be possible only for the straight-line moves.  As a result, the cutting time will be shorter, while cutting will be undertaken at a more consistent volume-removal rate and feed rate, so protecting the machine. 

Because Vortex toolpaths have a controlled engagement angle, tools should never be overloaded and so will achieve the maximum tool life.  Shock loading caused by changes in the contact angle is minimised, preventing chipping of the flutes.  In addition, the stability of the cutting conditions gives more consistent edge temperatures, so prolonging the life of the tool coating and removing heat damage to the surface of the part.  Finally, the ability to use stepdowns of up to two, or even three times, the tool diameter spreads the tool wear evenly over the cutting surface of the tool, again contributing to longer tool life. 

Vortex is fully-integrated with the PowerMILL’s step-cutting strategy for area clearance.  This approach minimises the terracing that can result from using a large stepdown by moving back up the part after generating the initial area clearance program and generating automatically extra toolpaths to remove additional material at intermediate slices.  It optimises the amount of material that can be removed with a single tool, while helping to maintain a more consistent removal rate by increasing the feed rate for the intermediate slices. 

“Anyone using the Vortex strategy will be able to hear the difference immediately,” claimed Mark Forth, Product Manager for Delcam’s Advanced Manufacturing Solutions.  “Conventional roughing produces a sound of varying pitch, which indicates that the optimum cutting conditions are not being used and could even be a sign of tool overload or chatter.  In contrast, Vortex roughing gives a constant pitch, showing that the tool is operating under consistent conditions.  Users will also be able to see the difference in the regular size and thickness of the chips produced, providing further evidence of the consistency of the cut.” 

For further information on Delcam’s PowerMILL software, please contact :-
Peter Dickin, Marketing Manager
Direct phone: 0121 683 1081             E-mail: marketing@delcam.com

 Delcam plc
Small Heath Business Park,
Birmingham, B10 0HJ, UK
www.delcam.com

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