December 7, 2004
Of all the geometric tolerances that are difficult to achieve, flatness is one of the hardest. Most stampers probably would much rather try to make a complex-shaped, thin, high-strength steel deep-drawn part than hold a small-tolerance part requiring a tight flatness.Achieving part flatness is a...
November 9, 2004
As a consultant and educator, I travel to numerous die shops and stamping plants, and almost all of them have the same basic request:"Can you show these tooling guys how to make the dies run better?"I hear comments like "We sure have a lot of downtime and scrap, not to mention the usual problems...
October 12, 2004
Establishing a good buying procedure is a critical aspect of the tool purchasing process. All too often tool supplier expectations are not communicated and executed effectively. Miscommunication can cause you to purchase a die that doesn't produce good parts, needs constant attention, wears out prematurely, or has other problems.
August 10, 2004
Figure 1Poor cutting section designCutting problems, such as die sections breaking, slugs jamming and pulling, and burrs, are common stamping challenges. Many of these problems are caused by poor die design. Others are caused by poor maintenance techniques, improper setup, and poor scrap...
June 8, 2004
Figure 1Double drawn stainless steel sinkSink photo courtesy of Polarware.Have you ever looked at a deep-drawn double-bowl sink and wondered how it's made? After all, one deep-drawn shell is right next to the other. Where does the metal come from to achieve the height?Figure 1shows a classic...
May 4, 2004
Author's Note: Before I get into the meat of this article, I would like to let my readers know how much I appreciate their loyalty to STAMPING Journal® and the Die Science column.STAMPING Journalnow is published monthly, and I am delighted to announce that I will be writing the Die Science...
April 6, 2004
Figure 1In today's competitive global market, stampers are looking for ways to reduce tooling and stamping cost by any means possible. Pitch notches, often referred to as French notches, are used commonly to prevent overfeeding and mis-hits in progressive dies. More often than not, however, using a...
February 12, 2004
Selecting a stamping die's pressure system can be a critical decision. Many questions must be answered to determine what type of pressure system best suits your application. This article is Part II of a two-part series that focuses on the different systems available, as well as the advantages and...
December 11, 2003
This article is part one of a two-part series that focuses on the different stamping die pressure systems available, as well as the advantages and disadvantages of each. The article also discusses some of the controlling factors that contribute to system selection.
August 14, 2003
It is not unusual for me to perform a few magic tricks when holding a conference on stamping die drawing, troubleshooting, or processing. Later on, I may disclose the magicbehind the trick. I do this for a couple of reasons: first, to entertain the conference attendees, and second, to show them that there is no such thing as magic, only physics.
June 12, 2003
The use of high-strength steel to manufacture automobiles and other transportation vehicles has increased dramatically. The material's strength allows manufacturers to reduce vehicle weight substantially and increase fuel efficiency, without sacrificing performance.
April 10, 2003
Setting up a stamping die is one of the most critical steps in a successful stamping process. It's a fact: More damage is done to a die, especially a progressive die, in the first 10 hits than in the next 10,000 hits. Most die damage happens during initial setup, when the material is being fed into the die. Mistakes such as misfeeds, pilot piercing, double metal, sheared cutting sections, and stock hang-ups often occur.