Eccentric Groove Machining Method for One-time Formed Eccentric Bolt

Abstract

The invention provides an eccentric groove machining method of a one-step molding eccentric bolt. The eccentric groove machining method of the one-step molding eccentric bolt comprises the following steps that the bolt is placed into a positioning through cavity (11) of a die body; a bolt correction mechanism clamps a bolt hexagonal head (3) to enable a connecting line of the highest point of thebolt and the axis of the bolt to be in a vertical state; a sizing mechanism of the die body changes the pore size of the positioning through cavity (11) to clamp a bolt rod body; a milling cutter (5)extends into a machining groove (12) of the die body for machining a milling groove of the bolt rod body; and the sizing mechanism of the die body changes the pore size of the positioning through cavity (11) again after machining of the milling cutter, the bolt is taken out, and the machining operation is completed. The eccentric groove machining method of the one-step molding eccentric bolt has the advantages that the connecting line of the highest point of the bolt and the axis of the bolt are in a vertical state, in this way, a position at which a groove needs to be milled on the bolt rod body is located at the top of the bolt rod body and directly faces the lower portion of a machining groove, and the machining operation of the milling cutter is facilitated, so that degrees of eccentricity of an arc groove of the milling groove and a bolt hexagon are guaranteed; and after the bolt is placed in the die body, firstly the bolt is slightly adjusted by the bolt correction mechanism, then the bolt is clamped and fixed with the die body, and positioning of the bolt is accurate.

Description

technical field [0001] The invention relates to a bolt manufacturing technology, in particular to an eccentric groove processing method for one-time forming eccentric bolts. Background technique [0002] There is an existing processing technology for eccentric bolts: cold heading bolts, stamping and punching eccentric gaskets. Because the materials of the bolts and gaskets are different, two heat treatment processes are used. Riveting with parts to complete the processing technology of eccentric bolts has many processing procedures, extremely low efficiency, high cost, and poor quality and performance stability of parts. There is another one-time forming process of cold heading. The milling groove of the split eccentric bolt is relatively simple. Through the positioning of the hexagon, the eccentricity between the arc groove of the milling groove and the hexagon can be guaranteed. However, since this eccentric bolt is an integral structure, Moreover, without hexagonal posit...

AI Technical Summary

Problems solved by technology

[0002] There is an existing processing technology for eccentric bolts: cold heading bolts, stamping and punching eccentric gaskets. Because the materials of the bolts and gaskets are different, two heat treatment processes are used. Riveting with parts to complete the processing technology of eccentric bolts has many processing procedures, extremely low efficiency, high cost, and poor quality and performance stability of parts.

There is another one-time molding process using cold heading. The milling groove of the split eccentric bolt is relatively simple. Through the hexagonal positioning, the eccentricity between the arc groove and the hexagonal angle of the milling groove can be guaranteed. However, because this eccentric bolt is an integral structure, And without hexagonal positioning, it is difficult to ensure the eccentricity of the milling arc through the positioning of the eccentric gasket

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