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Precision machine reduces grinding time.

Boeing Helicopters, Philadelphia, PA, is using a Weldon 2532 CNC precision cylindrical grinder to streamline its grinding operations, which include straight OD and ID grinding, as well as multiple OD/ID grinding, taper, and radius grinding.

The machine, manufactured by Weldon Machine Tool Inc, York, PA, along with Weldon's EZGRIND" software, has reduced grinding times for many parts-in some cases increasing productivity three-fold.

Previously Boeing used grinders with hydraulic or electronic digital infeed systems that required a lot of operator involvement and slowed production. Weldon's solution was this: provide a flexible CNC grinder with a programming system that doesn't require a trained CNC programmer.

The Weldon CNC grinder has an automatic swingdown internal-grinding hydraulically operated attachment that can be CNC programmed for multiple ID/OD grinding in one operation. The machine grinds parts of steel, aluminum, brass (including some with high nickel content) and M50 steel, with hardness up to 65 Rc. Diameters can range up to 25", and lengths to 32". Stock removal ranges from 0.006" to 0.015", and surface finishes from 32 RMS to 8 RMS.

Multiple surface grinding has been a time-saver for Boeing, compared with previous operations run separately. A drive train adaptor, for example, once required four separate grinding operations: two for OD grinding, and two for ID. Grinding times lasted over an hour. Today, the operator grinds the adaptor's two ODs and one ID in one setup. The setup is then changed for ID grinding on the part's opposite end. Total grinding time for each part is now approximately 10 min. Another part previously had been honed at the rate of 40 to 50 parts per shift. The part was first turned on a lathe, with 0.002" to 0.003" stock allowed for honing. Now 0.006" to 0.008" stock is left after turning on the lathe, followed by grinding on the Weldon CNC grinder with EZGRIND. Output has jumped to 140 parts per shift.
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Copyright 1991 Gale, Cengage Learning. All rights reserved.

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Publication:Tooling & Production
Date:Sep 1, 1991
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