游离磨料线锯切割是将磨浆中的磨粒通过一定速度的细钢丝线带入切割区域，达到去除工件材料的目的。多股线由多根细金属线绕制而成，表面具有很多凹槽，与钢丝线光滑表面相比，可以输送更多的磨粒进入切割区域，从而提高切割效率。应用0.25 mm的多股线和0.25 mm的钢丝线对光学玻璃K9进行切割对比实验，结果表明，在相同工艺条件下，多股线的切割效率和表面粗糙度均优于钢丝线，但切缝宽度大于钢丝线。

Grains in the slurry enter into cutting area by steel wire with a certain speed and remove the workpiece material in the free brasive wire sawing. Multi-strands wire is made by metal wires and has many grooves in the surface compared with steel wire. Therefore it can carry more grains into cutting area and improve the slicing efficiency. In this paper, optical glass K9 were cut by multi strands wire (0.25 mm) and steel wire (0.25 mm).The results show that multi strands wire is better than steel wire in slicing efficiency and surface roughness, but the kerf loss is wider than steel wire under the same process conditions.