Stamping Articles


Filter Content

R&D Update: Practical methods for estimating formability of sheet materials

July 7, 2016 | By Ali Fallahiarezoodar, Berk Aykas, David Diaz Infante, Taylan Altan, Ph.D.

Formability is the ability of a sheet material to deform without failure or fracture. Information on formability helps process and tool design engineers predict failure during analysis of sheet metal forming processes for tool design. Formability information also is used to evaluate...

Continue Reading


Die Science: How many hits does it take to get to the end of a tool’s life?

July 7, 2016 | By Art Hedrick

Recently I was asked at a training session to state the average life of a stamping die. The person asking was from the costing department of a large automotive firm. He said he needed to know because he was getting different answers from different individuals in the organization—anywhere from...

Continue Reading


Building effective and agile sheet metal forming supply channels

July 6, 2016 | By Bill Frahm

Strong supply chains hold the promise of all partners being able to share innovation. This requires a commitment from the manufacturers in the chain to be open and communicative. Without that trust, supply chain partners can hurt product success and sabotage profitability goals.

Continue Reading


Ask the Stamping Expert: How do we prevent buckling in thin material during strip feeding?

July 6, 2016 | By Thomas Vacca

Q: We are trying to stamp a drawn cup from 0.002-inch-thick by 0.500-in.-wide fully annealed stainless steel on a Bruderer BSTA 22e high-speed press with an aluminum ball bearing die set and a Bruderer 198/85 roll feed. There are six draws, and all of the draw die bushings are carbide with steel...

Continue Reading


R&D Update: Controlling material flow in drawing operations

June 17, 2016 | By Ali Fallahiarezoodar, Taylan Altan, Ph.D., Zeming Yin

The researchers at The Ohio State University's Center for Precision forming perform research on controlling material flow in drawing operation using CNC hydraulic cushions to help improve drawability.

Continue Reading


Reading progressive die strip — Part II

June 16, 2016 | By Art Hedrick

Editor's Note: This is the second part of a two-part article about reading progressive-die strips. Part I, which appeared in the May issue, covered the causes of pilot hole distortion and mismatched cuts. Hard marks, otherwise known as coin marks, occur when metal is severely squeezed between two...

Continue Reading


Die Science: Developing forming dies - Part III

June 16, 2016 | By Art Hedrick

Editor's Note: This is third installment of a three-part series that discusses die development for producing nonuniform, contoured parts by breaking the process down into eight steps. Part I covers the part material, its form, and its function. Part II discusses length-of-line analysis and tip...

Continue Reading


Die Science: Developing forming dies - Part II

June 16, 2016 | By Art Hedrick

Editor's Note: This is first installment of a three-part series that discusses die development for producing nonuniform, contoured parts by breaking the process down into eight steps. Part I covers the part material, its form, and its function. Part II discusses length-of-line analysis and tip...

Continue Reading


Die Science: Solving punch breakage problems - Part III

June 16, 2016 | By Art Hedrick

Numerous factors contribute to the premature failure of piercing and cutting punches. In addition to problems with the punches, such as tool steel or problems caused by EDM and grinding, the press can cause problems through deflection, and bridge strippers also can cause punch breakage.

Continue Reading


Die Science: Designing dies 2-D or 3-D?

June 16, 2016 | By Art Hedrick

Both 2-D and 3-D die design packages have advantages and disadvantages, which are discussed here, but true success lies in the designer's ability, not the software's.

Continue Reading


Die Science: Fundamentals of drawing

June 8, 2016 | By Art Hedrick

Columnist Art Hedrick goes back to basics about drawing, offering a comparison of drawing and casting, an explanation of flow and control.

Continue Reading


Ask the Stamping Expert: Five essential stamping rules for component designers

June 7, 2016 | By Thomas Vacca

Over the years I have received many requests from readers asking for suggestions and advice for particularly challenging stamping applications. Some of the issues can be addressed through creative tool design; some can’t. Some stampings by design make it virtually impossible to satisfy all the...

Continue Reading


Ask the Stamping Expert: Is it necessary to balance a die in a press?

May 31, 2016 | By Dennis Cattell

Q: I always try to balance my single-stage and progressive dies in our presses. However, with some new dies coming in, I have no room to move them in the press to a balanced condition. Is it necessary to balance a die in a press? A: To give you a better understanding of the subject, we should...

Continue Reading


Ask the Stamping Expert: How can I increase press speed without constant production stoppage

May 31, 2016 | By Dennis Cattell

Dennis Cattell advises that the centerlines of the press, bolster, feed, straightener, and reel might not be in line and the coil material guide settings might not be correct.

Continue Reading


Ask the Stamping Expert: How can we form holes smaller than the material thickness?

May 31, 2016 | By Thomas Vacca

Q: We are using a progressive die to make a part that is 3.770 inch in diameter with 45 holes, each 0.172 in. in dimeter, on a 3.514-in. bcd [basic center diameter]. Our customer has asked us to change the material from 0.080-in. half-hard copper to 0.240-in. half-hard copper. Now the hole is...

Continue Reading