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Improved Magnesium Molding Process (THIXOMOLDING)

ABSTRACT
This project performed by Thixomat, was granted funds from the NICE3 Program to build a full scale demonstration model of the Thixomolding technology. The Thixomolding technology incorporates preheating of pellets in a feed hopper; deep-penetrating, low-frequency induction heating; a screw feed designed to increase throughput; an improved, tight, non-return valve to maintain the inert argon atmosphere; and the use of "hot runner" technology that improves the yields of parts by 90%. All of these methods have been demonstrated separately or as part of a process in a related industry. As with plastic injection, magnesium alloy feedstock pellets are fed through a hopper. Unlike conventional means, the pellets are preheated before advancing to a reciprocating screw injection machine with a holding barrel and a specially designed screw. Pellet preheating increases the efficiency of heat transfer and increases system throughput. The method is expected to reduce energy usage and scrap recycling by 50% as well as eliminate the use of the global warming gas SF6, waste slag, and dross.
RELATED REPORTS
PERFORMING ORGANIZATION
Thixomat
CONTACT INFORMATION
Lisa Barnett
U.S. Department of Energy
1000 Independence Ave., SW
Washington, DC  20585
website: www.eere.energy.gov/industry/

phone: (202) 586-2212
fax: (202) 586-7114
email: lisa.barnett@ee.doe.gov

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