Cloud shape jumping chisel

The utility model relates to a technical field of BTA cutter discloses a cloud shape jumping chisel, be centrosymmetric two main cutting edges, two chisel edges, two chisel edges before edged surface, two major first flanks and two seconds after knife face including boring body, drillstock and drill tip, being equipped with on the drill tip, the main cutting edge is connected in chisel edge one end and is lain in major first flank one side edge, and the knife face lies in the chisel edge both sides respectively behind major first flank and the second, and the preceding edged surface of chisel edge lies in behind chisel edge and the second between the knife face, and its chisel edge anterior angle is the positive rake angle, it is equipped with two helicla flutes and two back of tooth that extend around its center pin and is two main lands of centrosymmetric and two pairs of lands, helicla flute, the back of tooth, the alternate setting with vice land of main land to bore the body surface, this cloud shape jumping chisel still including run through its both ends and respectively two parallel helicla flutes two in cold holes, cold holes originate in the drillstock rear end face and end in two major first flanks in two. Above-mentioned cloud shape jumping chisel has improved processingquality, has improved machining efficiency, has prolonged the life-span, the cost is reduced.