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Magnesium has been used in production laptop computer frames, video cameras, digital cameras, PDAs and other consumer electronics services and products due to the high power to weight ratio. When magnesium is alloyed with aluminum, the resulting material is quite gentle and powerful, and easily machinable.
The key problem in machining magnesium alloy may be the risk of fire ignition when dry cutting. Fire may possibly occur once the melting point of the mix (400-600 degrees Celsius) is exceeded throughout machining. If not properly handled the tiny chips and fine dust produced throughout cutting may also be highly flammable and present a significant fire risk.
There are several points to note when machining magnesium:
Firstly, use a lower cutting speed when compared to cutting metal. The workpiece temperature rises with an upsurge in reducing speed and also smaller undeformed chip thickness. Put simply, the slower the machining speed and the more expensive the chips, the lower the workpiece temperature will be. Because of this reason, some organizations have changed woodworking tools for machining magnesium so as to achieve bigger chips and lower fire hazard.The cutting tools used must have aid and clearance angles which are sufficiently large to avoid unnecessary cutting tool-workpiece friction, hence lowering the heat produced during the cutting process.
Second, keep the machining center clear. Washing the machining centers often and saving the magnesium chips effectively are essential facets of machining magnesium. Keep a box of cast iron chips not far from when machining magnesium, If fire does occur, smother the fire with the cast iron chips.
Additionally, if coolants are essential for high speed machining, do not use water-based lubricants. As an alternative work with a light mineral oil, or even a water-soluble chopping fluid such as Castrol Hysol MG particularly created for machining magnesium. Some companies in Japan use semi-dry machining with a misting system.
The fourth point is always to monitor the temperature throughout machining. Experiments were carried out using thermocouples installed to the workpiece to check the temperature during device. Dry cutting of magnesium metal thin walls was accomplished using cutting speed of 440m/min for roughing and 628m/min for fine finishing.
Despite the fire risks, as competition from overseas low-cost production bases intensifies, and magnesium becomes increasingly found in electronics products and services, most machining work shops may well find machining of magnesium a niche worth pursuing. cnc cutting systems
