had already spent two years researching and engineering a machining center concept for complete machining of these turbine shafts featuring an innovative component geometry. “Until now, the workpiece weight between chuck and tail- stock was limited to a maximum of 30 t,” said Werner Pommer, Weingärtner engineering and sales. “We had already thought about how we could scale up our mpmc 1200 machining center to accommodate larger turning diameters and heavier workpieces. In this respect, we were ahead of our competitors,” said Pommer.
This innovative approach paid off.
Weingärtner received the order to deliver the machine for processing the turbine shaft destined for use in a gas turbine power plant. From the time Weingärtner received the order, it had only 20 months to deliver the machine, a situation made all the more challenging by the fact that there was only one high- tensile steel blank, worth $200,000, available to make the prototype. Weingärtner regarded selecting the right tooling supplier as critical to opti- mizing the machine’s potential. From the original six potential suppliers invited to carry out simple milling tests, in the sec- ond phase, two were invited to produce special tools that were tested in-house on the mpmc 1200. Both models rep- resent an identical machining concept. The results were evaluated using a matrix with the most important criteria for selection met by Ceratizit. “Cutting Solutions by Ceratizit convinced us with their productivity, process security and dimensional accuracy,” said Pommer. By December 2014, Weingärtner had selected Ceratizit as its partner for de- veloping and delivering the tooling. “For the milling tests we used the Silverstar from the new grade. We were very confident that we would obtain outstanding results using the CTPP235
grade for this material group,” said Peter Uttenthaler, Ceratizit area sales manager for North America. “Other important tools included the extremely precise solid-carbide profile milling cutters for multiple cutting edges for the finish milling of the
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March 2017 |
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