Magnesium alloy precision machining CNC shell parts surface treatment

What are the surface treatments used for magnesium machined parts and magnesium prototype?

Magnesium alloys are active metals that can produce chemical reactions in the air. They require corresponding requirements for the processing, environmental, water, and chemical raw materials processes. Therefore, the surface treatment effects that magnesium alloys can now perform are: Microarc oxidation of magnesium alloys. , Magnesium alloy plating, magnesium alloy spray paint, magnesium alloy spray powder, magnesium alloy passivation and so on.

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CNC Machined Magnesium Applications

The Characteristics of Magnesium Parts Can be Summarized as:

• CNC machining magnesium parts have high strength, the ratio of strength to quality of magnesium alloy is high, and it has a certain bearing capacity.
• Magnesium parts have small elastic modulus, good rigidity, strong shock resistance, and are not easily deformed after long-term use.
• Magnesium machining parts have good resistance to electromagnetic interference and shielding.
• Magnesium machining parts do not pollute the environment.

Magnesium is widely used in aerospace, automotive, and electronic product shells due to its low ratio, high specific strength, stiffness, great shock absorption, electromagnetic shielding, good recycling, etc. It has a huge development and application potential. The development of magnesium alloy is limited since it is easy to be eroded in humid and coastal areas, which results from its chemical and electrochemical activity. Therefore, some methods have been researched for many years and help enhance the corrosion resistance and extend the service life.

Why Machining Magnesium Is Beneficial?

• Efficient Power Usage:Compared to metals like aluminum, machining magnesium demands only about 55% of the power, making it an energy-efficient choice.

• Speedy Machining:With high cutting speeds, generous feed rates, and deep cuts, magnesium machining takes the lead in efficiency, even against formidable contenders like stainless steel or titanium.

• Exceptional Surface Finish: The result? A remarkably fine and smooth surface finish, a feature that outshines the outcomes achieved with other metal types.

• Tidy Chip Breakage: The innate ease of cutting magnesium results in tidy chip breakage, offering a cleaner process than many other metals.

• Longer Tool Life: Reduced tool wear translates to prolonged tool life – a standout advantage akin to the benefits observed when machining materials like titanium.

Various CNC Machining Methods For Magnesium

How to safely machine magnesium?

Although it might sound daunting, it is perfectly safe to CNC machine magnesium if the right precautions are taken.

Avoid tight clearance angles

Although magnesium can be machined at fast speeds without compromising the quality of the part,

it is best to avoid tight clearance angles, because contact between the tool and workpiece increases friction and cutting temperature.

Maintain proper tool condition

Sharp cutting tools can reduce the fire hazard of machining magnesium.
Dull tools can rub and cause friction, which causes sparks and builds up heat where the sensitive magnesium chips

are being created. Needless to say, sharp tools will also produce better parts.
Most machinists use a carbide cutting tool with a large relief angle for machining magnesium.

Avoid water-based coolant

Although coolants reduce machining temperatures, a water-based coolant can actually increase the risk of a magnesium fire

as it will produce hydrogen gas.Avoid coolant altogether, or use a light mineral oil in place of standard coolant. Compressed air

or argon gas can also be used to reduce temperatures without the risk of exacerbating a potential fire.

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FAQs

Which magnesium alloy is the best for machining?

The best magnesium alloys commonly used in machining are AZ91 and AZ31. However, AZ91 exhibits a greater Knoop’s hardness (HK) of 76.2, while AZ31 offers 51.1 HK.

What are the disadvantages of machining magnesium alloy?

Regardless of the extensive benefits magnesium machining offers, its relatively limited availability, poor corrosion resistance, and lower density are significant constraints.

What are the common uses of magnesium?

Magnesium alloys are versatile materials commonly used to make lightweight components such as casings for cameras, medical devices, and electronics like phones and laptops. Additionally, magnesium alloys are used in making certain high-performance vehicles.

Can I weld magnesium?

You can easily weld magnesium alloys using the arc and resistance welding methods and oxyfuel gas welding technique.

Magnesium​ Sample Pictures for your reference:

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