Modern Machine Shop

NOV 2018

Modern Machine Shop is focused on all aspects of metalworking technology - Providing the new product technologies; process solutions; supplier listings; business management; networking; and event information that companies need to be competitive.

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MMS NOVEMBER 2018 104 mmsonline.com BETTER PRODUCTION LE AN MANUFACTURING Volvo and Sandvik Coromant came together for a week-long productivity improvement program (PIP), intended to improve the machining processes on a pair of new production cells. "The equipment was only a few months old, but our machinists were quite familiar with their operation. The main challenge at the time was that our casting supplier had recently been acquired by another company, and they switched to a lost-foam manufacturing process," explains Johan Alexandersson, director for machining at Volvo. "The material met our specifications, but it was harder, more porous and the casting them- selves were a bit more variable from a tolerance perspective. We'd been seeing increased tool wear ever since, which, in turn, drove our throughput and tooling costs to unacceptable levels." Volvo's PIP was centered around two different project areas in the axle machining area. The first was a machining cell with three, four-axis Heller H 5000 horizontal machining centers (HMCs) using HSK 100 spindles, 800-by-800-by-800-mm work areas and chip-to-chip times of 4 seconds. Two Okuma 2SP-V60 twin-spindle vertical lathes, each with 2,500-rpm spindles and robotic part-handling capabilities comprised the second cell. A pair of axle housings sit ready for final machining in one of Volvo's Heller horizontal machining centers (HMCs). Each machining center is equipped with an HSK-100 spindle and an 800-mm-cubed work volume. Precision Workholding Technology www.microcentric.com New Rapid Change Power Chucks feature a patented jaw design where only the top jaw is changed, elimi- nating the investment in multiple sets of base jaws or expensive mono block jaws. Rapid Change™Jaw Chucks Fast Changeover, High Accuracy, MicroCentric Quick

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