Modern Machine Shop

OCT 2017

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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Page 108 of 188

BETTER PRODUCTION Shops Using Technology 106 MMS October 2017 made from 1-inch-diameter 8620 alloy steel bar- stock that is fed by an automatic bar feeder into a Swiss-style turning machine, where the inner and outer diameters are blanked. The workpieces are sent out for case-hardening to 60 HRC and returned for hard-turning operations. A 1.5-inch- deep hole is then bored into each piece, holding a tolerance of ±0.0005 inch. Mr. Hawley recognized that the CCMT-type carbide cutting tool insert that the shop was using to bore the hole was causing three specific prob- lems. He says that each corner only lasted for 10 or 15 parts, and the cycle time for each piece was more than eight minutes. He also was not satisfied with the 38-microinch-Ra surface finish that the cutting tool produced. His cutting tool sup- plier put him in touch with an application and sales engineer at Horn, who recommended the S u p e r m i n i 10 5 t o o l system with an HS36- grade boring bar insert. The inserts have a car- bide substrate, a high- temperature-resistant coating and an adapted cutting-edge geometry specifically designed for hard turning materials r a n g i n g t o 6 6 H R C, eliminating the need for cubic boron nitride. A c c o r d i n g t o M r. H a w l e y, t h e r e s u l t s achieved with the new cutting tool exceeded his expectations. Cycle time was reduced from 8 minutes, 5 seconds to 1 minute, 23 seconds, and each boring bar now can be used for 75 parts. I n a d d i t i o n , s u r f a c e finish Ra improved to 20 microinches. Mr. Hawley says that the boring bar c a n b e c h a n g e d o u t quickly, which is an addi- tional benefit. All of this adds up to a 78 percent reduction in manufactur- ing cost. "Considering we annually make 2,000 Horn USA Inc., call 615-771-4100 or visit When the coolant becomes a Liquid Tool. Metalworking fluids to optimize productivity, economic efficiency and machining quality. Our specialists support you to get the best out of your machines and tools with the Liquid Tool. Please contact us for your local distributor. Blaser Swisslube Inc. Goshen, New York Phone 845-294-3200

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