Rollomatic's ShapeSmart NP50 Performs Roughing, Finishing in One Pass
Rollomatic’s ShapeSmart NP50 pinch/peel grinding machine is said to offer higher accuracy and speed than its predecessor. The pinch/peel process performs non-round grinding of such components as punches, die and mold components, and pins, both round and non-round. The machine is designed specifically for cylindrical grinding of carbide, ceramics, High Speed Steel and stainless steel workpieces.
Using pinch grinding, the machine performs rough and finish grinding in one pass, which reduces cycle times. The NP50 uses two different grinding wheels running on separate spindles and positioned using independently controlled CNC linear slides. A positioning camera and parts flipper are used for grinding coolant slots and through-holes in blanks. The roughing and finishing direct-drive spindles both provide 20 hp.
As an option, the machine can grind extra-long parts, providing a total grinding length of 16" for blanks as long as 19". The machine is equipped with a Marposs in-process gaging system and a Renishaw pre-probing system.
It sounds like a contradiction in terms-between centers and centerless grinding on one machine. But for some categories of workpieces, it's a viable production process that can yield machining time reductions of 45 percent over separate grinding operations.
No other process can do what creep-feed grinding can do. Recent tests show even more can be gained by optimizing every element of a creep-feed system.
Achieving consistent and quality results from the centerless grinding process requires an understanding of the basic fundamentals. Most application problems associated with centerless grinding derive from a misunderstanding of the basics. This article explains why the centerless process works and how to use it most effectively in your shop.