Chapter 17 Cold Forming Metal Sheet

Learning Objectives Identify the two main categories of stamping operations. Describe various metal cutting techniques and systems. Vereshchagin Dmitry/Shutterstock.com

Learning Objectives Explain how shearing, blanking, and piercing operations differ. Describe common cold forming techniques. Goodheart-Willcox Publisher

CAREER CONNECTION Ironworker Assemble metal frames that provide structure and support Learn through 3- to 4-year apprenticeships Mentally and physically able to work at great heights

Cold Forming Metal Sheet Cold working Operations at room temperature Stamping includes cutting and forming Hamik/Shutterstock.com

Cutting Operations Metal cut to size for machining Few bring material to exact size Shearing Brings sheet and plate stock to specified size or shape

Laser Cutting Systems Cut through materials of different sizes, thicknesses, and shapes Superior edge quality, precision, and accuracy Bystronic, Inc.

Plasma Cutting Systems Electric arc and ionized gases melt and cut Computer-controlled Vereshchagin Dmitry/Shutterstock.com

Waterjet Cutting Systems High-pressure, high-velocity stream of water Abrasive added for abrasive waterjet cutting Hydrodynamic machining (HDM) OMAX Corporation

Blanking, Punching, and Piercing Punch press with a punch and die Blanking Goodheart-Willcox Publisher

Blanking, Punching, and Piercing Progressive die has all cutting and forming dies in one die Stripper plate prevents sticking Goodheart-Willcox Publisher

Forming Operations Forming process uses press and die Flat metal blanks into three-dimensional shapes Drawing

Draw Press Operation Metal-shaping process on mechanical or hydraulic draw press Goodheart-Willcox Publisher

Guerin Process Forms shallow parts in rubber dies Goodheart-Willcox Publisher

Marform Process Forms deep parts in rubber dies Goodheart-Willcox Publisher

Hydroforming Rubber diaphragm backed up by hydraulic pressure Goodheart-Willcox Publisher

Bulging Entrapped rubber forming Rubber transmits pressure to expand metal blank or tube against die Goodheart-Willcox Publisher

Stretch Forming Metal blank is pulled from edges Wraps around form block Goodheart-Willcox Publisher

Bending Press brake bending Goodheart-Willcox Publisher

Bending Tube bending Allegheny Ludlum Steel Corp.

Roll Forming Series of rollers shape metal strip Goodheart-Willcox Publisher

Environmentally Friendly Machines GREEN METALWORKING Environmentally Friendly Machines Brush worktables reduce noise levels during operation High-efficiency components Computer control optimizes use of materials

High Energy Rate Forming Avoid springback Goodheart-Willcox Publisher

High Energy Rate Forming Sudden application of large amount of energy Explosive forming High-energy pressure pulse from explosive charge Goodheart-Willcox Publisher

High Energy Rate Forming Electrohydraulic forming Controlled discharge of electrical energy produces shock wave NASA

High Energy Rate Forming Electromagnetic forming Insulated induction coil around or within the work Magnetic field causes work to change shape Goodheart-Willcox Publisher

High Energy Rate Forming Electromagnetic forming (continued) Goodheart-Willcox Publisher