This paper introduces the measure of the stress-strain on the surface by dividing grid method during manufacture of internal helical gear by cold extrusion. Here are shown results of experimental researches at different stages of introduction of a punch at formation by extrusion of screw element on the internal surface of cylindrical space. And also gives the all magnitudes the stress-strain and its change law in deformation zone, and point out dangerous zone in which may be destroy. There is a kind of important spare parts in machine-manufacturing industry and instrument-making industry --- internal helical gear. Forming spiral unit on the side surface of cylindrical hole is a very complicated technological task, especially in the stamp-making condition, needing very high quality. Generally speaking, these spiral units are traditionally made by cutting. This method's efficiency is low technologically and economically, especially in making minor-diameter and high-depth hole, it can't be achieved. The development of cold extrusion makes it possible to efficiently use plastic deformation to form hole in a metal.
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