Electric hammer drill bit cold-headed part molding process

Abstract

The invention discloses an electric hammer drill bit cold-headed part molding process. The electric hammer drill bit cold-headed part molding process comprises 4-5 cold heading molding procedures; and the upper section of a finished wire raw material is thickly upset to form a drill handle rod body of an electric hammer drill bit cold-headed part, and the lower section of the finished wire is finely upset to form a drill body rod body of the electric hammer drill bit cold-headed part. The electric hammer drill bit cold-headed part molding process is characterized by further comprising the following molding steps before the first cold heading molding procedure: (1) the wire diameter of the finished wire raw material after drawing is smaller than the outer diameter of the drill handle rod body by above 0.35 mm; (2) the surface phosphating treatment is performed for the finished wire raw material; and (3) the finished wire raw material performs a pre-cold heading procedure after fixed-length cutting; an edge covering throat is formed at the lower end part of the finished wire; and the port caliber of the edge covering throat is smaller than the outer diameter of the drill body rod body after the first cold heading molding procedure. Through the molding process, the cold heading molding can be directly performed for the finished wire raw material (a metal wire) to form the electric hammer drill bit cold-headed part under the precondition of not performing the annealing treatment, so that the energy conservation and the environmental protection are achieved, the mold stress is low when cold heading molding, and the mold service life is prolonged.

Description

technical field [0001] The invention relates to a forming process of a cold heading part of an electric hammer drill bit. Background technique [0002] The electric hammer drill is a hand-held electric tool with two functions of "impact drill" and "electric hammer". At the same time, there is also a reciprocating hammering movement in a direction perpendicular to the rotating surface of the drill bit, which is used for drilling holes in concrete, bricks, tiles, marble and other materials. The drill bits of electric hammer drills used to be machined to form the drill shank and drill body. In order to improve efficiency and reduce costs, some manufacturers began to use cold heading forming process to produce electric hammer drill bits. Cold heading forming process generally includes 4 -5 cold heading forming processes, the upper part of the finished wire raw material (metal wire) with phosphating treatment is upset to form the drill shank body of the electric hammer drill col...

AI Technical Summary

Problems solved by technology

Since the problem of low mold force and long service life of the mold during cold heading is solved, the finished wire raw material (metal wire) can be directly cold-headed without annealing to form a cold-headed electric hammer drill. To achieve the purpose of energy saving and environmental protection

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