As we all know, the automotive and telecommunications industries are growing rapidly; To reduce air pollution. and save our earth, therefore; higher and higher requirements on energy saving of car. meanwhile; it requires car to be more and more light weight. To meet those requirements; current; more and more magnesium alloy products are applied to the automotive industry and communication industry; As a professional Magnesium alloy Die Casting manufacturer; we have fluent experience on magnesium die casting; and familiar with magnesium alloy properties. let’s discuss more on magnesium alloy die casting process, Machining and Surface treatment today.
Advantages and Disadvantages
| Advantages | Disadvantages |
| Light weight, The density of pure Magnesium is 1.78-1.83g/cm3 | Magnesium alloys do not conduct heat as well as aluminium alloys |
| High strength; Excellent heat dissipation, with a heat transfer coefficient of 51W/Mk. | Strong affinity with oxygen, easy to cause flame, flash, combustion, explosion and other hazards, need to use SF6 (concentration of 0.2-0.3%), N2 gas mixture as a protective gas |
| Magnesium alloy is less corrosive to dies and does not corrode ferrous metals, Longer tooling life. | Short solidification time, high filling pressure and fast filling speed, high requirements for die casting machines |
| Good fluidity of the alloy, good dimensional stability of the casting, not easy to stick to the mold, small draft angle need. | Burn rate of 5-8% for magnesium in Mass production |
| Surface treatments such as anodizing and coating can enhance the corrosion resistance of the surface; | Higher demand for die-casting machine equipment |
| Good look and feeling, magnesium alloy is fully recyclable | Die Casting Parts are susceptible to oxidation |
| Magnesium alloy die-castable thin-walled parts, Around 0.6mm | die casting Molds require a constant temperature, otherwise thin-walled parts are prone to cracking and therefore the scrap rate is highly dependent on the mould temperature |
Magnesium Alloy Die Casting Process
Magnesium die casting need 3 primary components. For examples; an Hot chamber die casting machine, die casting dies and ingot. the molds for die casting made by high strength steel. to withstand rapid changes in temperature.
The machine press the molten metal into tooling. after cool down; get the parts, the whole process include temperature, cooling, speed, time, pressure and other factor, it is complex. the complete process cycle time is short, from a few seconds to several minutes. Below we offer you a very brief explanation of six steps of the casting process.
STEP 1
Molten Ingot
Choose meet Rohs& Reach requirement.Due to the flammable nature of magnesium alloys, magnesium melting furnaces are required to have both melting and holding functions, and are ventilated with inert gas to isolate the air. The pouring is quantitative and the magnesium is pumped into the melting cup through the clinker tube, which is heated and kept warm. The melting of magnesium alloys is generally carried out in a double chamber furnace
STEP 2
Die Casting
Load the tooling up hot chamber die casting machine. and heat the molds temperature to around 640 degree. in case mold crack when meet molten metal. short the tooling life. in this process, molds closed; molten magnesium pressed into molds; after cooling down; we got the magnesium parts after mold open. the cycle time is very short. around seconds to minutes,
STEP 3
Debugging
Parts have gate; burs and flash in this stage. hence, we need to debug these with manual or die cutting machine. Although the appearance of magnesium alloy is brighter after cleaning and polishing. but the deformation will be larger, which is more difficult to correct due to the hardness of magnesium.
STEP 4
Surface Treatment
There have two types surface treatment; such as, Anodizing and Hardening.
STEP 5
CNC Machining
For some critical dimension with smaller tolerance. need to run CNC machining to make it.
STEP 6
100% Inspection
All parts will run visual inspection before shipping out. pick the NG parts out. to meet customers requirements.
Strengths
Why choose us?
In order to deepen the die-casting industry, we provide one-stop precision die-casting services.
- Competitive pricing
- High precision and quality products
- On-time delivery
4.With 8 magnesium die casting machines from 200 to 650 tons of locking force
5. can produce magnesium parts in a range of sizes from 2.0×2.0 CM to 45 x 45 CM
6. Low and High volume project both accept.