Production Machining

APR 2018

Production Machining - Your access to the precision machining industrial buyer.

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Dressing Technique for Truing Up Diamond Grinding Wheels Edited by Bart Bishop I t is not unusual for grinding wheels and dressing wheels to wear with use. Haas Multigrind LLC has encountered this issue with shops in several industries, including medical engineering, precision tool manufacturing, gear manufac- turing, the aerospace industry, the energy industry and particularly with those that manufacture profile inserts. To support their need for dimensional accuracy, these customers use Haas' Multigrind CB, Multigrind CA and Multigrind CU high-tech CNC grinding machines. For carbide insert manufacturers, Haas uses diamond grinding wheels that must be dressed (a slight trimming process to bring a tool into correct geometric form) on a regular basis to ensure grinding results. If not dressed regularly, high rpm can cause grinding wheels to become misshapen, resulting in negative effects both on quality and produc- tivity. Faced with the challenge of chasing geometry, 18 months ago Haas started devel- oping a new dressing process called XING (short for "cross") dressing. The Truth about Truing Up Each abrasive particle on a grinding wheel is a small cutting tool. "e XING dressing process is just one—although important—piece of the puzzle for producing high precision, carbide inserts," says David Drechsler, business develop- ment manager, North America at Haas Multigrind. "In order to grind carbide, we need to use a diamond abrasive wheel." Haas' grinding machines often use the tapered or :: This photo shows XING-dressing a tapered diamond grinding wheel, which is positioned at a 90-degree angle to the dresser wheel. V-shaped diamond grinding wheel to machine profile inserts. ese precise tapered diamond grinding wheels frequently feature an edge radius of a few hundredths of a millimeter and are correspondingly sensitive. "e geometry is very precise, so we must produce and maintain a precise radius or precise geometry on that grinding wheel," Mr. Drechsler says. When the edges of the grains of a grinding wheel (even TECH BRIEF 28 PRODUCTION MACHINING :: APRIL 2018

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