Magnesium Alloy Die-cast Housing
Magnesium alloy die-cast housing is a specialized manufacturing process utilized in the production of metal parts and components made from magnesium alloy. This process, often referred to as magnesium alloy die casting, involves injecting molten magnesium into a die or mold cavity under high pressure. The resulting product, also known as magnesium cast, is a complex shape or part that exhibits the unique properties of magnesium alloy.
What Is Magnesium Alloy Die-Cast Housing?
Magnesium alloy die-cast housing is a specialized manufacturing process utilized in the production of metal parts and components made from magnesium alloy. This process, often referred to as magnesium alloy die casting, involves injecting molten magnesium into a die or mold cavity under high pressure. The resulting product, also known as magnesium cast, is a complex shape or part that exhibits the unique properties of magnesium alloy.
The die casting manufacturing process for magnesium starts with the preparation of the magnesium alloy. The alloy is carefully melted in a furnace and subsequently injected into the die or mold cavity. Typically, the mold is constructed from durable materials such as steel and is meticulously designed to produce the desired shape of the final part.
Once the molten magnesium is introduced into the mold cavity, it undergoes rapid cooling and solidification under high pressure. This distinctive manufacturing method allows for the creation of intricate and complex shapes that would be challenging to achieve through alternative manufacturing processes.
Advantages of Magnesium Alloy Die-Cast Housing
Best for mass production
It is possible to engineer the dies to construct different sophisticated yet precise shapes because you produce them using die-casting molds.
Thanks to the die casting molds, it is possible to replicate the procedure some thousand times to form flawlessly identical metal casts.
This capability makes high pressure die casting suitable for mass production.
Furthermore, the metal fabrication method is convenient since it requires minimal to no machining.
Accurate, stable and long-lasting
The dies should be stronger in comparison to those used in the other molding operation so as to endure the exceptionally high-pressure injections.
Die cast parts are also dimensionally stable and heat-resistant whilst they sustain close tolerances.
Diecasts boast of a higher level of permanence if loaded in comparison to their equivalents.
This makes die casting a better option than the other metal mass manufacturing techniques available.
Tough and lightweight
Diecasts, even thin-walled types, have strengths far better compared to their plastic peers having similar measurements.
Moreover, since they are one intact piece unit and not an assembly of various parts, die cast parts are expected to be tougher.
The parts depend on the metal alloy strength rather than duration of how components hold together because of joining technique applied during manufacturing.
Supports variety of metals and alloys
Die casting process supports several different alloys and metals, with zinc being the popular option due to its high strength and ductility.
Tin, lead, aluminum, copper and magnesium are the other alloys and metals that you can process through die casting.
Cost-effective
Die casting process is equally comparatively affordable. This is another reason that makes it perfect for large-scale production applications.
Produces smooth surfaces
You do not have to worry over rigid or rough casting surfaces when using die casting.
Because it entails pressurized molten metal, die casting technique forms exceptionally smooth surfaces.
As you force the molten metal in the mold cavity, it fully fills while the molten metal is forced into the cavity of the mold, it completely fills the space ensuring a smooth surface.
Magnesium Alloy And Aluminum Alloy Die Castings
Magnesium alloy and aluminum alloy die castings are two common types of die-cast components used in various industries. Both alloys offer unique properties and advantages for different applications.
Magnesium Alloy Die-cast Housing
Magnesium alloy die-cast housing is a type of housing that is manufactured using the die-casting process and magnesium alloys. Die-casting is a widely used manufacturing method for producing complex-shaped metal parts with high precision and efficiency. Magnesium alloys, known for their lightweight and high strength-to-weight ratio, are particularly suitable for applications that require lightweight components with excellent mechanical properties.
Why Choose Us
Rich experience
Dongguan chengzhu metal products co., ltd. Was established on april 28, 2013. It is an enterprise integrating the molding, research and development, production and marketing of light alloy materials.
One-stop solution
The business scope includes the manufacturing of precision die casting molds for magnesium alloys, aluminum alloys and other light alloys, and the r&d, design, production and sales of die castings.
Widely used products
Products are mainly used in medical equipment, unmanned aircraft parts, robot/manipulator parts, new energy vehicle parts, motorcycles, electric vehicles, motorized scooter, electric tools, sports equipment, 3c, led, industrial parts and other fields.
Surface Treatment of Magnesium Alloy Die-Casting Housing
Grinding and polishing
Grinding and polishing parts is done to improve surface quality and aesthetics. Grinding and polishing may affect part size by removing a small amount of material.
Sandblasting
Sandblast the surface of the part with small glass beads to smooth the surface and prevent corrosion. It's great for adding an even matte finish, and dimensional tolerances aren't a critical issue.
Anodizing
A thin ceramic layer is added to the surface of the part to prevent corrosion and wear. Only certain materials can be anodized, such as aluminum and titanium.
Powder coating
Powder coating adds a thin layer of polymer to protect the surface from abrasion. The coating is abrasion resistant and can be added multiple times to improve protection. Powder coating can also be combined with sandblasting to improve corrosion resistance. This coating is ideal for CNC machined parts that require high impact strength or that cannot be anodized.
Considerations for the Production of Magnesium Alloy Die Casting Housings
Die life
Die life can be expected to be significantly improved compared to aluminum die casting. This is due to the heat transfer characteristics of magnesium and its reduced affinity with iron, resulting in negligible welding and corrosion.
Productivity
Due to the lower heat content of magnesium compared to aluminum, the metal solidifies faster, resulting in shorter cycle times, typically by 15-25%. The excellent dimensional stability of the as-cast product is a special characteristic of cast magnesium alloys. Generally, magnesium does not require annealing or stress relief treatment, contrary to the experience of some cast aluminum parts, where some growth will continue as the natural aging effect is prolonged at moderately high temperatures. Machinability is excellent, showing the best characteristics of all structural materials, namely reduced processing time, reduced power requirements, extended tool life, excellent surface finish usually obtained in one cut, minimal tool build-up, and reduced overall processing costs.
Sensitivity
During the magnesium alloy die casting housing cycle, each part of the casting develops a microstructure controlled by the local solidification rate and pattern. Proper design of the casting and its feed system is essential to ensure a uniform and directional solidification pattern. If this is not achieved, a certain proportion of micropores is expected to form due to volume shrinkage during solidification. This will prevent the magnesium alloy die-cast housing from achieving excellent properties. Ductility is an important process-sensitive parameter, and controlling inhomogeneities, defects and processes is essential to realize the potential for structural applications.
Types of Magnesium Alloy Die-Cast Housing
Cold-chamber die casting
Cold-chamber die casting involves introducing molten metal at room temperature into a separate shot chamber using a ladle or pouring method. The shot chamber contains a ram that vertically forces the molten metal into a steel mold (die) with movable and fixed sections. The ram applies pressure ranging from 2,000 to 20,000 psi to propel the molten metal into the die. The pressure is maintained until the metal cools and solidifies, after which the finished product is ejected from the die. This method is suitable for high-melting-temperature alloys like aluminum.
Hot-chamber die casting
Hot-chamber die casting is a metal casting process specifically designed for low-melting-point alloys like zinc, tin, lead, and magnesium. This process is the most common and faster method than cold-chamber die casting. In this method, the metal is melted within the casting machine, in a furnace connected to the machine. A hydraulic system injects molten metal into the die under high pressure. This process is efficient for producing intricate shapes with high-quality materials that have lower melting points. Still, it is not suitable for alloys with higher melting points due to the risk of damaging the pump that injects the molten metal.
Application of Magnesium Alloy Die-Cast Housing
Aircraft
The magnesium alloy die-cast shells generally used in the aerospace field are mainly plates and extruded profiles, and there are fewer castings. At present, the application of magnesium alloy die-cast shells in the aviation field includes various civil and military aircraft parts, propellers, gearboxes, bracket structures, and some parts of rockets, missiles and satellites. With the development of magnesium alloy die-cast shell production technology, its performance will continue to improve and its application range will continue to expand.
Automobile
Magnesium alloy die-cast shells have been widely used in developed countries for automobile dashboards, seat brackets, gearbox housings, steering system components, engine hoods, doors, engine cylinders, frames and other parts. The use of magnesium alloy die-cast shells to manufacture automobile parts can significantly reduce the weight of the car, reduce fuel consumption, reduce exhaust emissions, increase the integration of parts and components, and improve the flexibility of automobile design. Generally, for every 10% reduction in the weight of the car, the fuel efficiency can be increased by 5.5%, and the exhaust emissions are also reduced accordingly.
Electronic communications
Due to the development of digital technology in the electronic information industry, the market has higher and higher requirements for the high integration, lightness, miniaturization and environmental protection of electronic communication products. Engineering pigments have been used as the main material, but their strength cannot be compared with metals after all. Magnesium alloy die-cast shells have excellent thin-wall casting properties, and the wall thickness of their die-cast parts can reach 0.6~1.0mm, and they maintain a certain strength, rigidity and anti-collision ability, which is very conducive to the ultra-thin, ultra-lightweight and miniaturization requirements of the product, which is unmatched by engineering pigments.
Medical
In the medical field, magnesium first entered as an orthopedic biomaterial. Due to its many characteristics and properties, magnesium implants and similar applications have become a very attractive choice. The metal materials used for medical implants in the early days were stainless steel, titanium alloys and cobalt-chromium alloys, which have the advantages of good corrosion resistance and can maintain overall structural stability in the body for a long time. However, after a period of implantation, these metal materials will be painful for many patients. Because these materials cannot combine with the human body, harmful metal ions will precipitate, causing human allergies, and need to be removed by a second operation after the disease is cured.
Military industry
The application of magnesium alloy die-cast shells in military equipment can improve the strength of structural parts, reduce the weight of equipment, and improve the hit rate of weapons. At the same time, the magnesium alloy die-cast shell can meet the requirements of high-tech fields such as aerospace for sound absorption, shock absorption, and radiation protection, significantly improving the aerodynamic performance of the aircraft and reducing the structural weight.
5 Typical Defects of Magnesium Alloy Die Casting Housings and How to Avoid Them
Porosity
Porosity creates tiny air pockets or voids during the casting process. Porosity weakens the aluminum casting, which can cause leaks. High-quality aluminum alloys must be used, and the casting machine must be properly maintained and operated to prevent porosity. Porosity can also be reduced by using proper gate and venting designs.
Shrinkage
Warping or cracking of the casting can occur as shrinkage occurs when the metal solidifies unevenly and compresses. To avoid shrinkage, have castings with consistent thickness, proper gates, and riser systems for optimal cooling and solidification.
Cold Shuts
A cold shut is a casting defect caused when the metal cools before filling the space. By applying a proper gate and riser filling system, you can ensure that the metal flows and solidifies properly, preventing cold shuts caused by this excess material.
Flashing
Flashing is extra material that protrudes from the casting due to excessive metal injection. The gating system must be properly designed and managed to prevent excessive metal from flowing into the casting, thereby avoiding flash.
Warpage
Warpage is the deformation of the casting caused by uneven cooling, heat or residual strain. Warpage can be avoided by ensuring that the casting mold has good draft angles and rounded corners to reduce stress concentrations. In addition, the structure of the coolant should provide consistent cooling and prevent temperature gradients.
Process of Magnesium Alloy Die-Cast Housing
Step 1: Mold Preparation
The die mold comes in different sizes and designs. In terms of design and number of cavities, you should consider the following types:
Single cavity molds are the simplest type of die mold, having one cavity and capable of producing one part per cycle.
Multiple cavity molds have a more complex design characterized by identical cavities in a single mold. It can produce multiple but identical parts per cycle, hence its use in mass production of a single part.
Combination molds have cavities of different designs within the mold. As a result, they are more flexible and can create different types of parts per cycle.
Unit mold is a special die mold suitable for making parts with complex geometries without reducing accuracy. Examples are die casting products with cast-in inserts or thin walls.
After fabricating the mold, clean it to remove contaminants that can affect the part quality. Furthermore, preheat it to prevent thermal defects like cracks. Cracks can occur when there is a significant temperature difference between a die mold and liquid metal.
Step 2: Injection Process
Injection depends on whether it is a hot or cold chamber system. For a cold chamber system, melting takes place outside the casting machine. On the other hand, melting takes place inside the hot chamber casting machine. Afterward, inject the material at the right pressure into the die mold.
Step 3: Cooling
Allow the molten metal to cool and solidify to form the final part. Cooling should occur while the die mold is still clamped. Furthermore, depending on the variation of die casting, cooling might occur while maintaining or adding pressure. For example, in pressure die casting, cooling occurs under continuous pressure to prevent shrinkage.
Step 4: Ejection
After complete solidification of the cast, unclamp the die mold to activate the machine's ejector pins. This will push out the solidified part. Ejecting the part can be easier by lubricating the mold before injection of the molten metal and incorporating a draft angle.
Step 5: Trimming
Die-cast parts undergo trimming to remove flashes and other defects that leave excess materials on the part. Trimming alongside some post-machining processes such as grinding can also be used to ensure a tighter tolerance. Furthermore, die casts can undergo other metal surface treatments for improved mechanical properties, functionalities, and aesthetics.
Semisolid magnesium alloy die-cast housing
This process, also known as thixoforming, involves heating the shot, which consists of small pieces, to the liquid-solid phase transition temperature (the thixotropic state).
This allows the pressure to feed the material into the cavity. Since most of the melt expansion occurs at or shortly after phase change, this process minimizes shrinkage, shortens processing times, and increases precision due to the lower operating temperature.
Vacuum magnesium alloy die-cast housing
It is a special way to make high-quality metal parts with better precision. The charge is sucked up by a tool placed above the molten reservoir, using a vacuum delivered to the cavity.
They remove the air and gases from the mold before pouring in the hot metal. This makes the parts better and more precise.
Vacuum magnesium alloy die-cast housing is commonly done with aluminum and magnesium. It helps create strong and detailed parts that are used in cars, airplanes, and electronics.
Squeeze magnesium alloy die-cast housing
In this process, the tool is filled and then squeezed shut, forcing the fill into small cavity sections that wouldn't typically fill easily. This casting is ideal for use with metals with a high level of viscosity like zinc, nickel, and copper.
Gravity or low-pressure magnesium alloy die-cast housing
This less intricate method reduces tooling costs and equipment complexity by allowing parts with thicker portions to be low-pressure cast using gravity-fed (or even hand-ladled) fill.
Ideally, this method should be used with symmetrical, round aluminum magnesium alloy die-cast housing components.
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