Delcam at EMO

Published by: Mike Excell – Mon 22 Aug 2011
Feature Type: Software
Channels: CAD/CAM & Controls

Delcam is launching the 2012 version of PowerMILL for high-speed and 5-axis machining which includes a number of new strategies, and enhancements. The most important new option within PowerMILL is flowline machining, in which the toolpath is divided between a pair of drive curves in a constant number of passes, rather than having a varying number of passes with a constant stepover. The toolpath will have its start and end passes on the drive curves, with the intermediate passes blending between them. Stand H25, Hall 25This approach gives smoother results since it ensures that each pass travels over the full length of the area, rather than leaving the part, or making major changes in direction, during the pass. It produces a better surface finish on the part and minimises wear on the cutter and the machine tool.

In PowerMILL, flowline machining can be applied across part of a surface, across a complete single surface or across multiple surfaces. In addition, intermediate curves can be added between the boundaries of the area to give even greater control over the toolpaths. These might be needed for particularly complex fillets or when machining gently-curved surfaces to a smooth finish.

PowerMILL has offered an optional module for automated machining of blades, blisks and impellors for some time. This module has now been enhanced with the addition of a spiral machining strategy. This keeps the cutter on the surface of the part for the complete operation and so gives more even tool loading and a better surface finish. Another new option that will give better results during 5-axis machining is the ability to control the angular point distribution. This option can be used to keep the machine tool moving smoothly when there is rapid angular change in one of the rotary axes of the machine tool.  The problem occurs mainly when moving around sharp corners but is also important when the machine is operating near a vertical tool axis. If the machine tool is near the gimbal lock position, small movements in the tool-axis vector can result in large movements in one of the axes.

In both examples, smoother tool-axis changes can be achieved by increasing the density of the points in these areas. The user can specify the maximum angle that the tool axis can move between points.  Extra points are inserted automatically to ensure the specified maximum angle is not exceeded. This gives a more even movement of the machine and so gives a better surface finish, with no risk of dwell marks. The smoother motion also reduces wear on the machine. A more general enhancement is the ability use Bezier curves rather than polylines when sketching geometry in PowerMILL. Bezier curves give smoother boundaries, patterns and drive curves, and so enable better quality toolpaths to be produced.

Other enhancements include more control over the clearance distances applied to the cutter and its holder. This is especially desirable when machining near-vertical faces, as a smaller clearance can be set for the shank, while still allowing a larger clearance for the holder. It allows the shortest safe cutter to be chosen, with no risk of collisions. Using shorter cutters will usually allow faster machining and minimise chatter so giving a better surface finish.

In addition, thread milling options have been added, and workplane editing, and Z-height selection and limiting, have been made easier. It has also been made easier to obtain measurements, including distances, angles and directions, from the part model and enter these values into forms automatically. Finally, the use of the PowerMILL macro language to programme repeat operation has been extended to give users more options to customise the system for their particular needs.

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