October 6, 2015
Deep-drawing failures—from splitting to scoring to shock lines—often are a result of common engineering mistakes. These problems can occur whether you are using a single-station drawing die, multiple drawing stations, or drawing reductions. Let’s take a look at the five most common...
July 1, 2015
When I conduct training seminars on drawing and stretching, I usually bring with me a variety of unusual parts made using those processes. Often, attendees ask how to stretch the metal into a shape such as a deep can or deeply formed part without splitting the metal. I simply answer: “We don’t....
June 11, 2015
Slug pulling in a stamping die can be costly and frustrating. One pulled slug can cripple production. What Is Slug Pulling? When a pierce punch creates a hole, it also produces scrap, called the slug. When the slug sticks to the face of the punch during withdrawal or comes out of the button...
March 6, 2015
Opinions on how to troubleshoot a stamping operation are not in short supply at any production stamping or die-building shop. I’m not trying to stereotype diemakers, designers, or technicians, but their decisions often are made based on insufficient data. Statistically speaking, if I...
March 6, 2015
In Part I of this article, which appeared in the January/February 2015 issue, I discussed the first two basic steps in troubleshooting: Identify problems with the part and verify the die and press setup parameters. Following are the remaining seven steps in the process. Step 3—Reassess and...
May 10, 2011
It is almost unrealistic to expect some stamped part part features, such as hole position and flatness, to remain within a small tolerancing zone.
March 11, 2011
The forms and positional tolerances called out on product designs often defy the physical abilities of the product's material. Proper product and process design, as well as pressure clamping, can help maintain strict tolerances.
December 13, 2010
This article continues the discussion of deep-drawing and stretching variables begun in Part I by describing friction, thermal expansion, metal topography, and forming speeds and how they affect metal forming operations.
October 21, 2010
Ever wonder why one out of every 500 or so of your deep-drawn or stretched parts splits? Why you can’t make a part consistently? The answer lies in the variables of these operations—variables all metal formers must deal with.
August 9, 2010
Just what is involved in die building? Whether you are a die builder or a stamping company that uses dies, this overview can help you understand the many steps required to take a die from concept to production.
June 16, 2010
What is deep drawing? What part parameters require the process? What must you consider when designing a deep-drawn part, and when should you consider an alternate process, such as spinning?
April 13, 2010
When designing a part, you must decide which is the best way to form it. Should you draw it or stretch it? That depends on several factors, including forming depth.
February 9, 2010
In his first installment of DIEVESTIGATION, a new column about using research and data to solve stamping problems, tool and die expert Art Hedrick discusses how the metal specified during part design affects downstream operations and costs. What should you consider when selecting the metal?
December 15, 2009
How are bending, flanging, coining, embossing, stretching, curling, hemming, ironing, necking, and drawing related? They all are common metal forming operations. Find out more about these processes in this final installment of stamping expert Art Hedrick's sheet metal stamping series.