Why Is Everyone Talking About Magnesium Thixomolding?

 Learn more about the basics of the thixomolding process for magnesium parts from Proto Labs here. Proto Labs also has a special thixomolding Design Guide section that you can access here. Published September 2015 Rate this article .

Due to the conductivity of magnesium, Thixomolded parts have inherent shielding for EMI/RFI and solve your shielding problems without conductive paint. Magnesium Thixomolding has become one of the fastest growing global part manufacturing technologies. Thixomolding can be a desirable design replacement for injection molded plastic, cast metal, advanced composite materials and even sheet metal fabrications.

Parkway also offers tight tolerance injection molding of plastics..

In recent years, thixomolding technology has also been introduced in China. In 2009, Yiz umi developed the first Chinese thixomolding machine, which attracted considerable media attention. In the same year, the products of the MG series were approved on the Chinese market. In 2014, Yizumi was one of the leading companies to develop the worldwide industry standards for the Thixomolding .

Semi-solid metal casting (SSM) is a near net shape variant of die casting. The process is used today with non-ferrous metals, such as aluminium, copper, and magnesium, but also can work with higher temperature alloys for which no currently suitable die materials are available. The process combines the advantages of casting and forging.

Magnesium ThixomoldingMagnesium Thixomolding


Thixocasting[edit] Thixocasting utilizes a pre-cast billet with a non-dendritic microstructure that is normally produced by vigorously stirring the melt as the bar is being cast. Induction heating is normally used to re-heat the billets to the semi-solid temperature range, and die casting machines are used to inject the semi-solid material into hardened steel dies. Magnesium Thixomolding.

Thixomolding[edit] For magnesium alloys, thixomolding uses a machine similar to injection molding. In a single step process, room temperature magnesium alloy chips are fed into the back end of a heated barrel through a volumetric feeder. The barrel is maintained under an argon atmosphere to prevent oxidation of the magnesium chips.

After the solidus temperature is passed the grain boundaries melt to form the SSM microstructure. For this method to work the material should be extruded or cold rolled in the half-hard tempered state. This method is limited in size to bar diameters smaller than 37 mm (1. 5 in); because of this only smaller parts can be cast.

Tool Life The nature of semi solid processing magnesium is much gentler on tools/molds. Lower temperatures and better flow characteristics reduce the average wear and tear. We have tools with over 500,000 shots still in operation today, with very little maintenance required.

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Thixomolding is a unique manufacturing process that allows manufacturers to design highly complex, light weight parts from magnesium alloys for medium to high volume applications. It is not new process and has been used in the automotive, consumer products, drone, telecom, etc. industries for many years. Thixomolding is high-pressure injection molding of a semi-molten magnesium alloy and MIM is a powdered/sintered metal process.

The Mg chips are safely converted to a uniform, semisolid "thixotropic" state with a low but stable viscosity. After the material has accumulated to a predetermined shot size, it is injected with relatively high pressure and speed into the die cavity. Flow into the die cavity is laminar, unlike the extremely turbulent flow in diecasting.

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