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.