Interior thread processing instrument of super large pitch

The utility model belongs to the technical field of machining, a interior thread processing instrument of super large pitch is proposed. An interior thread processing instrument of super large pitch who provides has for coiling internal screw thread steel lathing (5), the shape of cross section of shape of cross section, size and the required coiling screw thread of steel lathing (5), measure -alike, the machining tool still is provided with dabber (1) that is used for steel lathing coiling curl, dabber (1) is the cylinder, and the diameter d of dabber (1) is measure -alike with internal screw thread internal diameter D1, the machining tool still be provided with model (2), anvil (3) and light hammer (4), model (2) right angled triangle for making by the paper material, the length of one of them right -angle side of right angled triangle is measure -alike with required processing internal screw thread pitch, another right -angle side of right angled triangle is pi and minor diameter of internal thread D1's product. The utility model has the characteristics of the book is made, the welding method manufacture process is simple, and production cycle is short.