Delcam Module Offers Faster Programming of Blisks and Impellers
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Delcam has launched a new module for its PowerMILL CAM system that offers much faster programming of the five-axis machining of blisks and impellers. Typically, the new option will allow even complex blisks and impellers to be programmed in around 30 minutes, compared with the many hours of work that would have been needed previously.
To generate the CAM program, the user simply has to divide the CAD geometry between the shroud, hub and blade, plus the splitter blade if appropriate. Then, the tools to be used have to be chosen from the tool database within the software and the type of leads and lifts specified. Next, the user needs to decide whether to undertake the roughing either by pocket or level by level. The latter option involves more air moves but avoids deflection of thin blades that can result when machining pocket by pocket.
A further choice may be made between finishing the blades either by machining the opposite faces of the pair of blades across a pocket or by machining around each blade. Finally, the predominant tool angle must be set. This will usually be normal to the hub, or to the shroud or to the centre line of the part. During the calculations, PowerMILL will automatically adjust this angle by the minimum amount required to maintain adequate clearance at all times and also to give smooth tool axis movement.
PowerMILL will then calculate the three type of toolpath needed to machine the item - a roughing toolpath to remove the bulk material, plus separate finishing toolpaths for the blade and the hub. A warning is given automatically if the cutter chosen for roughing will not remove sufficient material so that finishing can be undertaken safely. In these cases, a stock model can be produced showing the material remaining. This allows the user to choose either to reduce the size of the roughing cutter and so enable better access and increased material removal, or to create an additional semi-finishing toolpath to leave a safe amount of material for finishing.
To further speed the calculation times, if the blades are evenly spaced, PowerMILL will automatically count the number of blades and produce a complete set of toolpaths in a single operation. When the blades have different spacings, toolpaths must first be produced for a single blade and then copied around the hub at the appropriate angles.
For further information on Delcam's PowerMILL, please contact:
Peter Dickin, Marketing Manager
Direct phone: 44 (0)121 683 1081
e-mail: marketing@delcam.com
Delcam plc,
Small Heath Business Park,
Birmingham, B10 0HJ, UK
www.delcam.com
