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spring pins

Die Basics 101: Part XII

February 13, 2007 | By Art Hedrick

Slug pulling, which occurs when scrap metal—the slug—sticks to the punch face upon withdrawal and comes out of the button, or lower matrix, is a serious problem that can damage parts and dies. Various methods can help reduce the occurrence of slug pulling. Air Vents Putting air vents in...

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R&D Update: Hot-stamping boron-alloyed steels for automotive parts - Part III

February 13, 2007 | By Taylan Altan, Ph.D.

To accurately model the hot-stamping process, FE simulation needs to account for the mechanical, thermal, and microstructural changes in the workpiece.

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R&D Update: Hot-stamping boron-alloyed steels for automotive parts - Part I

February 13, 2007 | By Taylan Altan, Ph.D.

Hot-stamped parts are being used increasingly in cars in Europe and North America. Ultrahigh-strength steels, like boron alloys, which meet automotive safety and crash requirements, are difficut to form with cold stamping, so hot stamping with die quenching has been applied.

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R&D Update: Hot-stamping boron-alloyed steels for automotive parts - Part II

January 18, 2007 | By Taylan Altan, Ph.D.

Compared with cold-formed parts, hot-stamped parts provide better formability at high temperatures and exhibit no springback on the final part.

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Sheet metal resistance

Draw forming, Part VI

January 9, 2007 | By Edmund Herman

Energy input at one location in a part during forming is redistributed throughout the part as the forming process advances. The result must be an adequate force transmitted back to the location of target strains and displacements.

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Die handling tools

Choosing the right die handling tools

January 9, 2007 | By Michael Schollmeier

Many stampers rely on the machines and equipment you already have for moving and changing stamping dies. Using dedicated items such as die carts and shuttle tables can make die change more efficient.

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Cutting shear

Die Science: Solving punch breakage problems - Part II

January 9, 2007 | By Art Hedrick

Cutting shear, or the angle ground into the end of a punch, has a big effect on punch deflection and breakage, as well as press tonnage required. Retainers, which hold the punch to the die shoe, also are important. The backing plates, ball lock punch retainers, and headed styles of punches and retainers all require careful consideration.

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Stainless steel stampings

Viking's range of choices

December 12, 2006 | By Kathleen McLaughlin

The stainless steel stampings Viking Range produces often require complex draws and piercing, as well as sharp corners and creases—with flawless exterior finishes. Viking has moved from outsourcing its stampings to using press brakes to investing in hydraulic presses of increasing capacity and sophistication—all in an effort to gain greater control over the design, quality, and availability of stamped parts.

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Solving punch breakage problems

December 12, 2006 | By Art Hedrick

This series of articles investigates the many causes of premature punch breakage in stamping operations.

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Slug pulling diagram

Die Basics 101: Part XI

December 12, 2006 | By Art Hedrick

Slug pulling is a serious problem in a stamping operation. Addressing the issue requires first understanding why the slugs are pulling. What Is Slug Pulling? When a pierce punch creates a hole, it also produces scrap, usually referred to as a slug. Slug pulling occurs when the slug sticks to the...

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Piercing punch burr

Die Science: Solving punch breakage problems - Part I

December 12, 2006 | By Art Hedrick

Numerous factors contribute to the premature failure or breakage of piercing and cutting punches. Two common factors are operator error and incorrect die cutting clearance.

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Forming lubricants

Lubricant developments for forming high-strength steel

December 12, 2006 | By Paul Bosler Jr.

Forming lubricants always have been a critical component in the metal forming process, but the performance characteristics of these products are even more essential when working with HSS.

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R&D Update: Multipoint-control die cushion systems for stamping complex parts - Part II

November 7, 2006 | By Taylan Altan, Ph.D.

In deep drawing of complex, asymmetrical parts such as stainless steel kitchen sinks, blank holder force (BHF) needs to be controlled locally to regulate the flow of the sheet metal. An MPC blank holder system allows this control by placing individually programmable cushion pins around the blank perimeter, with an appropriate BHF selected at each pin location.

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stamping die change

10 common quick die change problems

November 7, 2006 | By Paul Van Every

Die changeover is one of the few times when a press isn't making money. Why do some die changeovers take hours? It might be the press, operator, die, material, lift truck, crane, or the tools.

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Multipoint-control die cushion systems for stamping complex parts - Part III

November 7, 2006

With constant BHF, conventional steel sheets can be formed with few tryouts. However, with the increasing use of lightweight materials and high-strength steels with low formability, there is a need for precise, localized control of metal flow using MPC systems.

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