Grinding Journal - Fall 2007 - (Page 24)

Tiruna Delivers SUPER Service, ith an overall length of nearly sixteen feet, flutes up to ten feet long, and a two foot diameter, a corrugating roll is one heck of a tool. If manufactured and serviced properly, they’ll last six to eighteen years and process hundreds of thousands of miles of corrugated board, book covers, fast food cartons and the like. But it takes a very special shop to deliver the necessary service, leading most users to Tiruna America Inc. in Green Bay – a 50/50 partnership between Tiruña S.L. (Pamplona, Spain) and Fosber America Inc (Green Bay). More complicated than they appear Corrugating rolls appear to be very similar giants, but there are subtle differences between them that are critical to their performance. Being able to assess and maintain these differences is what sets Tiruna apart. Uniquely groovy Corrugating rolls operate in pairs, pulling the paper between them and creating folds, or corrugations, by pushing the paper into flutes that run the length of the roll. Depending on the circumference of the roll and the desired output, there may be hundreds of these flutes. Although they appear to be simple grooves, there are many tiny variations in possible flute profiles (Tiruna offers 250) and these variations impact performance. Because rolls are hard (50 Rockwell or more) and their flute forms must be precise, rolls must be ground. Tiruna made their grinding easier and more productive by choosing a Mägerle MGC machine. When a roll arrives for service, Tiruna takes a casting of the flute with a synthetic resin. Using a program Fall/Winter 2007 W Easy does it! Doug Botten loads a 12,000 lb. monster – Twenty-four inches in diameter and solid except for a three inch diameter hollow through the center. Like every roll, it presents its own challenges in compensating for sag to achieve the desired linear profile. written by Roll Grinder Technician Doug Botten, they trace the profile with an automatic state-of-the-art vision system. Once the operator digitizes the profile, he determines the width of each flute “valley” and

Table of Contents Feed for the Digital Edition of Grinding Journal - Fall 2007

Grinding Journal - Fall 2007 Contents From Virginia: Apparently no credit crunch for machine tools Why measure cutting tools Other perspectives on CNC tool measuring Productive grinding of superalloys SUPER service grinding BIG rolls Problem Solver

Grinding Journal - Fall 2007

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