Influence on chip formation
The type of chips formed in the machining process is related to factors such as material composition, part shape, alloy state and feed rate. When a single-edged tool is used for turning, boring, planing, and milling of magnesium alloys, the generated chips can be divided into three categories: a. Forming coarse and good chips at large feed rates; b. At medium Chips with short length and good chip breaking are formed under the feed rate; c. Long and curled chips are formed under the small feed rate.
Effect on Twist Deformation
Due to the high specific heat and good thermal conductivity of magnesium, the heat generated by friction will quickly diffuse to various parts of the part, so the high temperature will not be generated when the magnesium alloy is machined. However, in the case of high cutting speed and large feed, the heat generated by the part is also quite high, and it is likely to be distorted due to excessive temperature.
Effect on Thermal Expansion
If the dimensional tolerance of the finished parts is strict, the influence factor of the thermal expansion coefficient of magnesium must be considered in the design. If a considerable amount of heat is generated under the above machining conditions, it is likely to affect the machining accuracy of the part. The thermal expansion coefficient of magnesium is slightly higher than that of aluminum and significantly higher than that of steel, which is 26.6-27.4 μm/m°C in the range of 20200°C.
Effect on cold deformation
During machining, magnesium alloy parts rarely suffer from distortion or warpage caused by cold deformation. However, when the tool is too dull, the feed rate is too slow, and the tool pauses during processing and other unfavorable factors, it may also cause distortion or warpage