Page 43 - MetalForming January 2017

Tooling by Design
deep drawing of stainless steels is that they are less formable than mild steels, because they workharden so much. In reality, many grades have substantially higher ductility than plain-carbon steels and frequently are deep drawn into very complex shapes without the need for intermediate annealing. Even the less-formable ferritic grades pro- vide outstanding ductility.
Increased blankholder forces also will be required for deep drawing alu- minum stampings since aluminum grades have a Young’s modulus one- third that of steel. The reduction in Young’s modulus increases the likeli- hood for wrinkling, oil canning and
“A common misconception about deep drawing of stainless steels is that they are less formable than mild steels, because they workharden so much.”
surface distortions, while increasing the magnitude of springback by a factor of three (compared to steel sheet of equivalent yield strength).
Blankholder-pressure requirements for stainless steel will be much higher than for low-carbon drawing steel. The ferritic grades (430 for example) require about 50 percent more pressure, while the austenitic grades (304, 316 for example) may require as much as three times the applied force of that needed for low-carbon steel. This is an impor- tant factor to consider when evaluating press energy and tonnage capacities during press selection.
If you did not attend the conference this year, you missed a lot. Plan to attend the next edition of the PMA Metal Stamping Technology and Tool & Die Conference, in January 2018 in Nashville. Interested in presenting? Contact me at pulintz@pma.org. MF
Spotlight on PMA
We Are 75!
2017 marks PMA’s 75th anniversary! We are proud to have been serving the met- alforming industry and our member com- panies for 75 years.
To commemorate this milestone anniver- sary, several activities are being planned during 2017 including a special feature in the July issue of MetalForming, a celebratory gala during FABTECH in November and the launch of a brand new PMA website.
PMA thanks you for your support over the years and looks forward to continue providing key resources and information in the years to come as the industry continues to evolve.
PMA Selected as National Partner
to Grow Apprenticeships in Manufacturing
PMA is proud to be partnering with the National Institute for Metalworking Skills (NIMS), which has been selected by the U.S. Department of Labor (DoL) as an industry intermediary to support the expan- sion of registered apprenticeships within manufacturing. PMA will work with NIMS to increase access to apprenticeships and assist employers in developing new pro- grams that reach diverse talent pools. As part of this initiative, $500,000 is available to support companies in establishing a registered apprenticeship program with the DoL. Companies interested in building an apprenticeship program can visit www.mfgap-
www.metalformingmagazine.com
MetalForming/January 2017 41
prenticeship.com or e-mail apprenticeship@nims-skills.org for more information.
Upcoming Calendar of Events
January 11-12, Slide Forming Workshop, San Leandro, CA
January 15-17, Management Development Academy 2017, Session One, Tampa, FL January 24-25, Deep Draw Seminar, Cincinnati, OH
January 25-27, Sales & Marketing Executive Networking Group, Miami, FL
January 26, Punch & Die Technology Seminar, Cincinnati, OH
Visit www.pma.org or contact PMA at 216/901-8800 or info@pma.org for details about these upcoming events.
PMA Welcomes its Newest Members
• Flex-N-Gate Alabama, LLC, Mc Calla, AL
• United Wire Company, Inc., North Haven, CT
Join PMA and experience the power of membership! Contact Janet Krall at 216/901-8800, jkrall@pma.org with questions.