Cold heading manufacturing method for tor-shear type bolt

The invention relates to a cold heading manufacturing method for a tor-shear type bolt, which comprises the following steps: martial cutting; adopting a ternary-necking mould produced by hexin standard mould piece factory in Nibo; forcibly necking the cut material to the size of the diameter of a wabbler formed blank through the ternary-necking mould in the first procedure, wherein the enter angle is controlled within 25-27 degrees; performing pre-heading of head parts, telescopic rods, end surface pre- chamfer angles in the second procedure; finely performing heading of the bolt head parts and the chamfer angles in the third procedure; and necking the dodecagonal wabbler in the fourth procedure. The method has the benefits that the product consistency is good, the production efficiency is high, no consequent auxiliary expense is produced, and the procedures of parkerizing, necking the dodecagonal wabbler and the like are avoided, and accordingly the manpower and material resources are reduced, the processing