The invention discloses a chipless forming method for a
gear stick and a section gear through hot
extrusion by utilizing an
alloy steel horizontal type backward extruder, solving the problems that the existing
gear cutting process has more working procedures, low efficiency, large
metal loss, more operators for
machine tool
processing and high production cost and the like by utilizing the
chip processes of lathing, milling, drilling, inserting and
grinding. The method comprises the following steps: an inner cooling combined type double-
conical surface gear squeezing die, a recipient and a floating pecker combined
mandril are adopted by taking the producing principle of
alloy steel
thick wall special seamless steel tubes as an example; scale-free heating is rapidly carried out on the blank; lubricating warm-
extrusion molding is carried out; center
punching, shaft hole slotting and
tooth surface extrusion are finished at a time; and the finished product of the
gear stick is directly produced, then is subject to
waste heat annealing,
slicing by wire-
electrode cutting and heating process to be manufactured into a finished product. Compared with a
chip gear-
cutting molding method, the invention has simplified working procedure, few labor, high efficiency, less
metal loss, high gear strengthen and reduces the production cost, and then
tooth surface precision reaches the standard. The method of the invention is a significant technological innovation of straight tooth and oblique tooth cylindrical gear process technologies.