汽缸套是汽车、拖拉机及其它内燃机的主要零件,通常缸套的原材料为高磷铸铁、钒钛铸铁或球墨铸铁,而加硼元素铸铁是目前国内外较为先进的缸套材料。由于在铸铁中含有高硬度的硼硬质点,其表面硬度在HB 300左右,加工较困难,因而刀具使用寿命低,严重地影响生产效率的提高。机械 Cylinder liner is a major component of automobiles, tractors and other internal combustion engines. Usually, the raw material of cylinder liner is high-phosphorus cast iron, vanadium titanium cast iron or ductile iron, while boron-added cast iron is the most advanced liner material at home and abroad. Due to the hardness of boron in cast iron hard points, the surface hardness of about HB 300, processing more difficult, so the tool life is low, seriously affecting the production efficiency. mechanical