Magnesium is used for high performance / weight ratios for notebook computers, video cameras, digital cameras, PDAs and other consumer electronic products. When magnesium is alloyed with aluminum, the resulting material is very light and strong and easy to work.
The main reason for machining the magnesium alloy is the ignition of a fire when a dry cut occurs. There may be a fire if the melting point of the alloy (400 to 600 degrees Celsius) is exceeded during machining. Small chips and fine powders resulting from cutting are very flammable and cause serious fire hazards if they are not properly handled.
When machining magnesium, several points should be noted:
First, use a lower cutting speed than aluminum trimming. Workpiece temperature increases with increasing cutting speed and smaller deformed chip thickness. In other words, the slower the machining speed and the larger the chip, the lower the workpiece temperature. For this reason, some companies have changed woodworking tools for machining magnesium to achieve greater chips and lower fire risk. Used cutting tools must provide supplies that are sufficient to prevent the friction of unnecessary cutting tool work, thereby reducing the heat generated during the cutting process.
Second, keep the machining center clean. Regular cleaning of machining centers and proper storing of magnesium chips are important aspects of machining magnesium. When machining magnesium, approach the cast iron chips container. If there is a fire, hold the fire with cast iron flakes.
Thirdly, if high-speed machining requires coolant, do not use water-based lubricants. Instead, use light mineral oil or water-soluble cutting fluid such as Castrol Hysol MG, specially designed for machining magnesium. Some Japanese companies perform semi-dry machining through a vacuum extractor system
The fourth point is to observe the workpiece temperature during machining. The experiments were performed with thermocouples mounted on the workpiece to check the workpiece temperature below the machine. Dry cutting of the thin walls of the magnesium alloy has been achieved at a cutting speed of 440 m / min for roughing and 628 m / min for fine machining
Despite the risk of fire, as the competition in overseas cheap production bases increases and magnesium is increasingly being used in electronic products. most machining stores can find a great deal of magnesium machining, which is worth doing.
Source by sbobet