Stamping Articles

Whether you're using a high-speed stamping press to make simple parts at breakneck speeds or doing something really tricky, like deep drawing a material that puts up a lot of resistance, the information in this technology area is sure to help. The articles, case studies, and press releases cover stamping presses, lubricants, and materials.

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Ask the Stamping Expert: How can I reduce snap-through condition effects?

March 31, 2016 | By Dennis Cattell

In the May/June 2012 “Ask the Expert” column, you discussed the causes of the large vibrational energy wave that must be dissipated by the press structure beyond the shear loads. Is there any way to reduce the vibration? A: Many lamination and blanking dies incorporate moveable stripper...

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Ask the Stamping Expert: Why do press and die problems occur at lower-than-capacity press speeds?

March 31, 2016 | By Dennis Cattell

Q: To improve efficiency and reduce cost in our newly acquired high-speed blanking operation, we have increased press speeds from 225 SPM to 450 SPM. After several successful months, we are experiencing a high number of new press and die problems. The presses are capable of speeds higher than 500...

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Ask the Stamping Expert: Can I pierce material in a progressive die in the opposite direction?

March 31, 2016 | By Thomas Vacca

Q: Do you have much experience with piercing material in the opposite direction than usual in a progressive die? In other words, the slug goes through the punch shoe. A: Yes. This is very doable and not uncommon. I assume you need to do this because the piercing direction is a part-functional...

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Ask the Stamping Expert: How do I hold washers in the strip in a compound die?

March 30, 2016 | By Thomas Vacca

Q: Do you have suggestions for holding washers in the strip in a compound die? High-strength, low-alloy material properties change from heat to heat, periodically causing parts to drop out of the strip. For this reason, we blank up and use a knockout bar to eject the parts. A: Two significant...

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What’s sizzling in hot stamping?

March 28, 2016 | By Kate Bachman

This multisource article touches hot stamping's growth and new technologies and approaches to its further development, including pressure controlled hardening, hot forming of aluminum and magnesium, the option of using a servo-mechanical press that has been modified for hot forming as well as a hydraulic press, and secondary processing performed in-die to avoid having to use a laser cutting machine for trimming.

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Die coatings morph to help form AHS aluminum

March 21, 2016 | By Bernard Janoss

A new die coating has been developed to help alleviate complications of forming high-strength aluminum, such as sticking and abrasion.

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Tools for troubleshooting

March 17, 2016 | By Kate Bachman

Trial and error is a difficult, time-consuming, and costly way to try out new parts or find the sources of problems in a stamping operation. Vision systems, “action” cameras, die design simulation, and spectroscopic metallurgy analyzers for material analysis can help stamping manufacturers make adjustments on the front end to save time and money by several magnitudes on the back end.

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Ask the Stamping Expert: What do the various press styles have to offer?

March 11, 2016 | By Thomas Vacca

Q: I am having a problem stamping a shallow drawn cup about 0.75 in. deep from 0.045-in. 304 half-hard stainless steel. I’m using a mechanical press. What do other press technologies have to offer? A: Years ago I wrote a brief on the major differences between mechanical and hydraulic presses....

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Ask the Stamping Expert: The 10 Tooling Laws explained

March 11, 2016 | By Thomas Vacca

Q: In your last column you listed the 10 Tooling Laws. I had never seen these before. Can you please explain each law in more detail? A: I drafted these laws years ago out of necessity. After more than 35 years of experience in the stamping field - - many as a master toolmaker, then as a...

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Ask the Stamping Expert: When is a WEDM purchase justifiable?

March 11, 2016 | By Thomas Vacca

A stamper is getting pressure from customers to add WEDM to reduce costs. Thomas Vacca advises him on how to justify the purchase.

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Ask the Stamping Expert: How can we maximize our tooling’s hits per service?

March 10, 2016 | By Thomas Vacca

Q: We are running high-strength, low-alloy (HSLA) brackets for a large aerospace firm. We cannot get the hits per service we need from our tooling and are struggling to meet production requirements. Any advice? A: Regardless of how many hits per service you get off a tool, you always want to...

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Ask the Stamping Expert: Why does tooling fail during coining and forming operations?

March 10, 2016 | By Thomas Vacca

Q: In our stamping division, we do a lot of coining and forming of 300 and 400 series stainless steels from 0.030 to 0.090 in. thick. We coin up to a 30 percent reduction in thickness and form multiple bends with very tight radii. Our punches and form die inserts fail. They break, crack, chip, or...

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Ask the Stamping Expert: How do I calculate shear pressure when figuring stamping die tonnage?

March 9, 2016 | By Thomas Vacca

Q: I read the article “How can I reduce snap-through condition effects?” in the September/October 2012 STAMPING Journal®. If I understand the article correctly, you do not want to stagger the punches too much to prevent the stored energy from releasing before the next set of punches hit. If...

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R&D Update: Lightweighting in the automotive industry using sheet metal forming, Part 2

March 9, 2016 | By Ali Fallahiarezoodar, Taylan Altan, Ph.D.

Editor’s Note: Part I of this article appeared in the January/February 2016 issue.

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Ask the Stamping Expert: Why does my tooling yield such big variation?

March 9, 2016 | By Thomas Vacca

Q: My company stamps right-side and left-side links for conveyor belts. The peanut-shaped parts, made in a changeover tool, are about 0.1 in. thick, 1.5 in. wide, and 3 in. long. Half of the part (lengthwise) is coined offset, one material thickness in depth. This is in addition to a number of...

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