Production Machining

DEC 2017

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

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coupled to the guide bushing. read whirling attacks the workpiece axially with the tool rotating around the blank as it is fed in the Z axis. Because of the cutting force's direc- tion, deflection from thread whirling is reduced. By dividing the cutting load among the number of inserts located on the toolholder's periphery, tool life is significantly improved compared with single-point turning. It also allows for higher feeds, which results in shorter cycle times. However, little or nothing stands still in metalworking and thread whirling is no exception. Recent developments in insert geometry creation and arrangement of those inserts on the cutting toolholders is helping shops take advantage of the traditional advantages of thread whirling coupled with significant performance improvements in tool life and cycle times. Enter 'Turbowhirling' Earlier this year I attended a biennial Technology Days event at the Tübingen, Germany, headquarters of cutting tool manufacturer, Paul Horn GmbH. e company has a manufacturing facility in Franklin, Tennessee, which is impressive and growing, but it's hard to beat visiting a company's headquarters. Technology Days is open to Horn's customers, distributors and members of the press. I look forward to these visits because each time I have participated, I have come away with generic technical information that can be used in PM. is year was no exception. One of the eight technical presentations, all in English, that stood out was on a new process for thread whirling that the company has trademarked as 'Turbowhirling.' It was presented by Chris Foschaar, one of Horn's U.S.-based application technicians. "What Horn has done with its Turbowhirling process is to modify what has become known as conventional whirling," Mr. Foschaar says. In conventional whirling using six inserts, for example, the inserts would cut all the material off the blank or barstock, down to the major diameter of the screw in a single pass. The cutter is set to remove the material above the major diameter of the screw, which is the bulk of the material to be removed. :: Turbowhirling is a recently developed thread whirling technique that divides the cutting action of the whirling tool into roughing and finishing operations performed in a single pass. This drawing shows the different inserts positioned around the toolholder. :: Rotary whirling is a new process being developed in Germany for thread whirling. Called parallel turning, it combines thread whirling (orange) and single-point turning (green) to produce threads at very high production speeds. The workpiece blank is fed in Z axis through the sliding headstock (purple). Rotation of barstock Rotation of Whirling Ring Direction of Feed Two New Twists on Thread Whirling :: 31

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