ADVANCES IN MAGNESIUM INJECTION MOLDING (THIXOMOLDING~R)

摘要

The present paper will introduce some advantages of the Thixomolding technology in comparison to high pressure die casting. Firstly, the closed system in combination with the intensive mixing in the barrel is beneficial for casting alloys containing elements that are known to be prone to oxidation, segregation or evaporation in conventional die casting. Data will be presented for AZ-, AJ- and AS-type alloys which demonstrate an improvement in mechanical properties for thixomolded material. In addition the low temperature level can reduce die sticking and hot cracking and improve die life. In a second part of the paper another important advantage of Thixomolding will be demonstrated. As the processing technology is similar to polymer injection molding, hot runner systems can be developed which gives Thixomolding another unique selling point Scrap can be greatly reduced, heat energy and raw material is saved and flow length can be reduced dramatically. Results will be presented for a first hot runner system that has been installed on a 220t - Thixomolding machine.