Jun 26, 2018 5:06 pm

Circle Grid Analysis and Thickness Strain Analysis

By |2018-06-27T19:38:33-04:00Jun 26, 2018||0 Comments

Thinning and Circle Grid (Surface) Strain Analyses are Engineering Quality tools that can help determine where trouble spots could develop during the production processing of your parts. The forming limit of a given steel is based on the thickness and the strain hardening exponent (n-value). The forming limit for other alloys must be determined experimentally. Knowing these parameters, and their minimum values likely to be encountered in production, it is [...]

Jun 26, 2018 2:15 pm

Forming AHSS: Playing By New Rules

By |2018-06-27T19:39:49-04:00Jun 26, 2018||0 Comments

Advanced High Strength Steels have been gaining ground in an automotive industry hunting for all the weight savings it can while satisfying or surpassing safety standards. The material could be called the next step in steel's evolution toward exhibiting the high-strength, lightweight characteristics of more expensive materials, like aluminum and magnesium. Challenges arise, however, from a formability standpoint. The varieties of AHSS do exhibit high formability, but in entirely different [...]

May 31, 2018 2:13 pm

Articles Available for Download

By |2018-07-09T23:03:07-04:00May 31, 2018||0 Comments

20% Maximum Thinning rule should not be a rule Circle Grid Analysis and Thickness Strain Analysis Forming AHSS: Playing By New Rules Introduction to Advanced High Strength Steels – Grades Introduction to Advanced High Strength Steels – Processing Secondary Work Embrittlement [...]

May 31, 2018 1:31 pm

20% Maximum Thinning rule should not be a rule

By |2018-06-26T18:26:24-04:00May 31, 2018||0 Comments

Everyone likes to have a “Rule of Thumb” to use as a quick and easy guide. To make the best use of these maxims, it helps to understand where they came from, and what the limitations are in their use. When it comes to taking the right steps to ensure a robust stamping process, a surface strain analysis using a forming limit diagram is recommended. The forming limit curve should [...]

May 31, 2018 1:27 pm

The Importance of a Crisp Grid Pattern and Proper Grid Measuring Technique

By |2018-06-22T19:14:02-04:00May 31, 2018||0 Comments

The correct way to use the Mylar strip is to measure from the center-width locations of the boundary line around the circumference of the now-deformed ellipse. Measuring from inside-to-inside or outside-to-outside is wrong! With a fuzzy ellipse boundary line (old stencil, poor gridding technique, etc.), it is not hard to make measurement errors more severe than just measuring the outside-to-outside dimensions of a crisp circle/ellipse. The width of the line [...]

May 31, 2018 1:25 pm

Tool & Die Authority

By |2018-07-09T22:26:59-04:00May 31, 2018||0 Comments

The Tool & Die Authority was published by the Precision Metalforming Association as a combination of blog-style news and exclusive information about tool and die companies, markets, customers and much more. TDA provided solid technical tips not found anywhere else that helped tool and die operations solve a range of challenges, enabling them to offer top-notch service to their customers while improving their bottom line. Tool & [...]

May 31, 2018 1:20 pm

Dr. Stu Keeler – The Science of Forming

By |2018-06-26T18:54:02-04:00May 31, 2018||0 Comments

Danny Schaeffler may be the current Science of Forming columnist, but Dr. Stuart Keeler was the founding columnist where he wrote nearly 200 articles. Engineering Quality Solutions is a proud sponsor of the Science of Forming Vol. 2, a CD-ROM containing many of the material-formability articles and tutorials by metalforming expert Stuart Keeler. Dr. Keeler is best known worldwide for his discovery of forming limit diagrams, development of circle grid [...]

May 31, 2018 1:09 pm

Stamping 101 – Material Selection

By |2018-06-27T19:47:09-04:00May 31, 2018||0 Comments

Abstract Sheet metal production isn't much different than baking a cake. It requires the right ingredients, added at the right time and processed at the right temperature for the right amount of time. Literally hundreds of different types of metals are available, each with it's own blend of physical, chemical, and surface properties and characteristics. Pure metals are relatively soft and malleable. When you move a carpet, it takes alot [...]

May 31, 2018 1:03 pm

Secondary Work Embrittlement

By |2018-06-27T19:48:28-04:00May 31, 2018||0 Comments

To determine if a grade of steel is prone to secondary cold work embrittlement, the ductile-to-brittle transition temperature (DBTT) is determined. The DBTT is the highest temperature at which a brittle crack is formed. More information about the cause for secondary cold work embrittlement and how to test for it can be found in THIS FREE DOWNLOAD. Let Engineering Quality Solutions determine if your grade is at risk for secondary [...]

May 31, 2018 12:56 pm

The Difference Between True Stress and Engineering Stress

By |2018-06-27T19:49:27-04:00May 31, 2018||0 Comments

Think about pulling a bar in tension. Load divided by cross-sectional area is force, or stress. But what cross section are you considering? Before starting that pull, the bar had a known cross-section of, let's say, 0.5" wide x metal thickness. It's easy to measure these, since it is your starting material. At any load, the engineering stress is the load divided by this initial cross-sectional area. While you are [...]

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