Grinding Wheels’ Bond System Enables Sharper Cutting, Less Vibration
Saint-Gobain Abrasives will showcase its Norton Quantum3 (NQ3) depressed-center grinding wheels, which feature a special grain along with a tough bond system containing fillers and bonding agents that allow for much better mix quality in manufacturing. These wheels are said to provide faster grinding for more metal removal and longer wheel life with less operator fatigue, increasing overall grinding output.
The wheels are constructed using a precisely engineered iron, sulfur and chlorine-free resin technology to provide a uniform abrasive distribution throughout the wheel. This bond was designed for retaining the grains long enough during and after grain fractures, boosting cut rate and wheel life. The company says that this grain tends to be more rounded than precision-shaped ceramic grain, enabling a more robust, sharper cutting action with less vibration for much easier operator control. The company says that the wheels don’t grab or dig when used in any direction, and that free cutting control can boost the amperage on its own without additional pressure needed on the tool.
The new wheels are offered in 12 Type-27 all-purpose grinding application SKUs, one Type-28 all-purpose and two Type-27 SKUs for foundry applications. Sizes range from 4" × ¼" × 3/8" to 9" × ¼" to 7/8".
Roughing and finishing on a single machine, using a single setup, has appeal for most shops. The advantages in time savings and accuracy are obvious. Eliminating the transport of workpieces between machines, as well as the setup for those secondary operations, is a boon for throughput. Critical features that need to maintain dimensional relationships can be much more reliably produced if machined complete in one clamping.
Two enabling technologies -- superabrasive wheels and high precision servo control -- come together to provide a contour grinding process that resembles an OD turning operation. For many medium volume OD grinding applications, this method may be a means to consolidate several manufacturing steps into a single setup.
In vertical grinding, the workpiece is held upright in a rotary chuck with the grinding spindle overhead. This configuration can improve roundness, facilitate single-setup processing and prolong the life of the machine. Loading and unloading may gets easier, too. Workpieces with relatively large diameters and short lengths benefit the most from vertical grinding.