Gear Production
Issue link: http://gear.epubxp.com/i/155418
F E AT U R E A new gear milling module within the MORI-AP conversational programming software converts the user's input on gear characteristics into the simultaneous multi-axis tool paths that generate the desired gear profle. Toolpath simulation helps verify the fnished program (see inset). runs on a PC for offine CNC programming. This software module guides the programmer through a series of entries pertaining to data about the desired gear shape, such as the number of teeth, pitch diameter, pressure angle and so on. All of this data is attainable from callouts on the part print, so a solid model in CAD is not required to calculate the tool path. InvoMilling algorithms in the software automatically create the process plan to machine a complete gear (sequence of steps as outlined above). According to developers, the NT series turnmills are especially suitable for involute gear milling because the B axis on these machines has ±120 degrees of rotation, a high-speed direct-drive motor and indexing that resolves to 0.0001 degree. Precise machine motions, however, must be supported by the high quality of the cutting tool. For this reason, the CoroMill disk cutters for InvoMilling are manufactured for very low runout and use coated carbide inserts with positive geometry on the cutting edges. The aggressive milling parameters appropriate for these cutters result in low cutting forces, enabling larger tooth forms to be machined even though the multitasking machining center is less massive than comparable hobbing machines. 20—GEAR Production Supplement New Directions Although innovative processes such as InvoMilling promise to move gear making into broad new settings atracting fresh entrants to the feld, these developments also reinforce some important shifts in general machining. Most notably, this is the ascendancy of the multitasking CNC machining center. Adding highly fexible and capable gear production further solidifes the value of single-setup, integrated machining. Likewise, these developments demonstrate the benefts of close cooperation between machine tool builders, manufacturers and software developers. Such joint efforts reduce development time and bring innovations to end users more quickly. There will be fewer delays waiting for the capability of the machine, the cutting tool or software to catch up with advances in the other sectors.