Page 57 - MetalForming September 2016

forming and abrade forming and cutting tools. Even though the oxide layers are very thin, they significantly increase the level of friction between the tool and workpiece. This increase in friction and the resulting heat generated combine to rapidly degrade tool life. Higher wear rates increase costs for tool mainte- nance, downtime and production. Met- alformers must select the proper pro- cessing methods, tool coatings and lubricants to optimize tool performance.
Blankholder Pressure and Die Clearance
Blankholder-pressure requirements for stainless steel will be much higher than those for low-carbon drawing steel. The ferritic grades (430) require about 50-percent more pressure, while austenitic grades (304, 316) may require as much as three times the applied force compared to forming low-carbon steel. Carefully consider this factor when evaluating energy and tonnage capacity during press selection.
Increased blankholder forces also are required for deep drawing alu- minum stampings, since aluminum’s Young’s modulus is one-third that of steel. This reduction in Young’s modulus increases the likelihood of wrinkling, oil canning and surface distortion, while also increasing the magnitude of spring- back by a factor of three compared to steel sheet of equivalent yield strength.
ing challenges. To help make life easier, PMA has developed a new annual con- ference that specifically addresses the needs of metal stampers and their tool- and-die suppliers.
ricators Should be Paying Attention to the Internet of Things (IoT) and Indus- try 4.0.
PMA’s first annual Metal Stamping Technology and Tool & Die Conference will be held in Chicago, IL, December 5-6, 2016. Presenters will address the latest technologies developed for pro- cessing metal stampings from mild and high-strength steels, stainless steels and aluminum alloys. Topics include die design and construction, tooling, lubrication, presses and press-line equipment. Conference sessions also include two keynote presentations: Industry Benchmarking: Current Trends in the Metal Stamping and Tool & Die Industries; and Why Metal Fab-
Individual technical tracks are avail- able, including: stainless steel 101, design guidelines for stamping alu- minum, transfer-press die simulation, sensor technology for progressive dies, lightweight stamping technologies, tooling solutions for AHSS, new tech- nology for measuring lubricant thick- ness, incremental microplastic forming for low-volume metalforming, and scanning and surface morphing solu- tions for die design and reverse engi- neering. And, tabletop exhibits will fea- ture several industry-leading suppliers.
THE BIG NAMES TRUST US. THE SMALL ONES TOO.
Tooling by Design
To learn more, contact Marianne Sichi, PMA technical programming manager; msichi@pma.org. MF
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Our clients know they can always expect custom solutions from us, whether they are big or small. A highly qualified team is always ready to provide effective answers to any need because we control the entire production process. Sensors for force, position, pressure and temperature measurement; indicators, power and temperature controllers; automation platforms and industrial inverters: whatever your need, you can trust us.
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8 Lowell Avenue Winchester, MA 01890 - Toll free 1-888-888-4474 info.us@gefran.com - www.gefran.com
Booth C14026
Also, the required clearances between the draw post and die cavity will be greater for stainless steels compared to mild steels. Austenitic grades require a clearance equal to the workpiece thick- ness plus an additional 35 to 40 percent per side; most ferritic alloys require workpiece thickness plus 10 to 15 per- cent additional clearance per side.
New Conference Brings Clarity
If you or your company designs dies or produces stampings from a variety of different material types, it can be difficult and time consuming to find the resources and technical informa- tion needed to solve these ever-chang-
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