August 10, 2004 | By Art Hedrick
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 | By Art Hedrick
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 | By Art Hedrick
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 | By Art Hedrick
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 | By Art Hedrick
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 | By Art Hedrick
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.
October 9, 2003 | By Art Hedrick
Bend angles are among the most frustrating geometric features to control in metal stamping. This is due primarily to two factors – the inconsistency of the mechanical properties in the metal being bent and the die design.
August 28, 2003 | By Art Hedrick
Stretching or embossing, not to be confused with drawing, is the process in which the part's geometry is obtained by stretching the metal into a forming cavity.
August 14, 2003 | By Art Hedrick
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 | By Art Hedrick
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 | By Art Hedrick
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.
April 10, 2003 | By Art Hedrick
During the recent economic downturn, sheet metal stampers, die shops, and some job shops experienced layoffs and some closed their doors. However, a few stampers have remained profitable despite uncertain economic times.
March 13, 2003 | By Art Hedrick
As a consultant for the sheet metal stamping industry, I have had the opportunity to visit numerous stamping plants, die shops, and engineering facilities. One comment I often hear during these adventures is how arrogant or "know-it-all" some of the toolmakers or engineers are.
February 13, 2003 | By Art Hedrick
Most automobile manufacturers have looked for alternatives to the steel traditionally used in car production; hence, the introduction of high-strength steel.
November 21, 2002 | By Art Hedrick
Over time negative tonnage can cause significant press and die damage. Understanding the factors that influence the amount of negative tonnage can help you control it.