Sharpening mill:this machine is to sharpen the head of steel wire before it is feed into the wire drawing machine,the principle of the drawing machine is that using different size of drawing dies,for example,to draw steel wire of 6.5 mm to 5.8 mm,we can use a drawing die of 5.8mm,sharpen the head of 6.5mm steel wire less than 5.8 mm first,then put the head into the die,then fix the head of the wire to the wire drawing machine,then start pulling.after the wire come through the die,all the wire becomes diameter of 5.8mm.