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STAMPING Journal® - January/February 2008
 
STAMPING Journal® January/February 2008

Publication Information:

Publication:

STAMPING Journal®

Issue:

January/February 2008

Publish Date:

Tuesday, January 1, 2008

Information Website:

http://www.fma-communications.com/sj/

Subscription Website:

http://fma-communications.com/Forms/Digital-Stamping-Subscription-Page.cfm

Selected articles from January/February 2008 issue published on TheFabricator.com:

Stamping 101: Die basics

This article introduces beginning toolmakers, die maintenance technicians, engineers, and press technicians to tool and die components and their functions

Controlling slug pulling with hole lapping

Diemakers have several options for slug-pulling problems, such as knockout pins, vacuums, punch or die dulling, oil viscosity, wire EDM hole slots, punch/die clearance changes, edge shearing, mechanical grippers, air jets, and cuped-shaped punches. Another method to help stop slug pulling is bell- mouthing the die, which essentially involves cutting a funnel shape around the hole.

Lubrication and galling in stamping of galvanized AHSS

Forming of galvanized AHSS involves higher contact pressures at the tool-workpiece interface compared to forming mild steel. Under these severe interface conditions, improper selection of lubricants, tool materials and tool coatings may result in high scrap rates and galling in stamping production.. Based on SDT results, polymer-based lubricant with EP additives and water-soluble DFL were found to be most effective, Synthetic lubricants showed also reasonably small frictional responses with a PVD coated die in forming GA coated strips.

Stamping 101: Material guidelines

Each metals has its own blend of physical, chemical, and surface properties and characteristics. Knowing about the major work metals (not tool steels), their properties, grades, and characteristics helps to achieve the best results in stamping and forming best results.

Stamping 101: Anatomy of a Mechanical Press

Stamped components are made by forming, drawing, trimming, blanking, or piercing metal—in sheet or coil form—between two halves (upper and lower) of a press tool, called a die. The upper member (or members) are attached to slide (or slides) of the press, and the lower member is clamped or bolted to the bed or bolster. The die is designed to create the shape and size of a component. The two halves of the die are brought together in the press. Both force (load) and accuracy are required to achieve the repeatability and tolerance demands.

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