Generally, the hardness of pig iron castings is high because they have not been annealed, so white spots occur in some areas, but it is often better to improve the workability by eliminating the white spots and performing spheroidizing annealing. There is. If the acceptance does not affect the use, the direct machining can actually save a lot of costs and the delivery time is very short, the carbide milling blade BN-S30 grade HLCBN can be used directly for milling. This type of blade has high hardness and good toughness. It is best to use round blades for high blade removal and good surface finish.
In addition, the milling machine table performance requirements: frequently used cast iron castings, such as gray cast iron HT200-HT300, working surface hardness is generally HB220-350, after 600-700 degree annealing and 2-3 years natural aging, The purpose of heat treatment of floor boring and milling table work table floor milling machine table is to reduce the gradual stress, eliminate some of the structure of the white mouth of the cast iron plate, the hardness of the working surface of the floor milling machine table, floor milling machine table And the wear resistance is improved, the cast iron platform has stable cast iron plate precision, and the wear resistance is good.