GRINDING
Pinch/Peel Grinding of Non-Round Punches, Parts Rollomatic Inc. (Mundelein, IL) has introduced its ShapeSmart NP 5 fi ve-axis grinder with a new pinch/peel grinding option for non-round grinding of punches and pins. The non-round process incudes full pinch/peel grinding designed to ensure extremely high tolerances, form accu- racy, and an exceptionally low TIR in grinding thin and long parts. Oblong punches, form punches, squares out of center, corner radiuses, and other shapes can be produced with this technology. The ShapeSmart NP 5 is designed and dedi- cated for cylindrical grinding of carbide, HSS, and stainless components with emphasis on achieving the highest surface fi nish and concentricity. Rough and fi nish grinding are performed in one pass, eliminating a separate process and reducing cycle time. The machine utilizes two differ- ent grinding wheels running on separate spindles and positioned on independently controlled CNC linear slides. For example, Rollomatic has demonstrated pinch/peel grinding of a 0.2 × 0.5-mm oblong radius form punch over a length of 2" (51 mm) with extremely tight toler- ances, perfect radius tangen- cies, and practically no TIR. Customer-specifi c tests have resulted in a shape accuracy of 0.002 mm and a surface fi nish of 2–2.5 μin. Non-round form punches up to 0.75" (19-mm) diameter/size can be processed with pinch/peel grinding. In addition to oblong punches form punches, squares out of center and corner radiuses are being cut. For every rotation of the tooling part, the X and V axis (roughing and fi nishing wheel) interpolation with the C axis (tool axis). The ShapeSmart NP5 features a positioning camera for grinding coolant slots in blanks with coolant-through holes. Form grinding cutting tool blanks for the industrial, medical, and dental markets, as well as production grinding of die and mold components, and precision punches, including non- round punches is possible.
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AdvancedManufacturing.org | December 2016
Grinders Cover Variety of Surface, Profi le Applications FSG-ADS series fully automatic three-axis grinders from Chevalier Machinery Inc. (Santa Fe Springs, CA) with a PLC controller provide a grind cycle with rough grinding, fi ne grinding, and spark-out passes. An automatic over-wheel dresser with compensation can be added to fully automate the grind process. After the cycle is fi nished, the table will park either left or right of the saddle and at the front to facili- tate unloading and loading.
The FSG-ADS series is well-suited for mass production and is easy to set up, program, and operate with user-friendly conversational programming. The machine’s spindle can be set to “stop running” or “continue running.” The wheel head can also be set to return to the start position or to park at a refer- ence point. Once the cycle is started, the wheel head moves
Rollomatic’s ShapeSmart NP 5 fi ve-axis grinder features a new pinch/peel grinding option for non-round grinding of punches and pins to extremely high tolerances, form accuracy, and an exceptionally low TIR.
rapidly to the start point and repeats the grind cycle. If material is required to be removed from both sides, “fl ip over” can be se- lected, leaving the wheel head position at the fi nish grind height, which then starts grinding immediately without touching off. The fully automatic grind feature consists of rough and
fi ne-grinding cycles, switching from rough-grinding down- feed increments to fi ne-grinding down-feed increments at preset points during the cycle. The crossfeed also switches from a rough to fi ne cross-feed increment, resulting in a fi ner surface fi nish and fi ner accuracy.
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