Extrusion processing method of magnesium alloy AZ91D internal threads

Abstract

The invention discloses an extrusion processing method of magnesium alloy AZ91D internal threads, and belongs to the field of material extrusion thread processing methods. The extrusion processing method solves the problem that the magnesium alloy extrusion thread processing technology is difficult. The extrusion processing method comprises the steps that after machining is conducted on a magnesium alloy AZ91D cast ingot, so that a magnesium alloy AZ91D bar material is obtained; the magnesium alloy AZ91D bar material is placed in the middle of an inner cavity of a die, and the two ends of thedie are tightly screwed and fixed in a threaded mode; then the die is put into a box type resistance furnace, and after the temperature is risen to range from 380 DEG C to 440 DEG C, the temperature is kept for 16-22 hours; after water cooling is accomplished, the bar material is clamped on the working plane of a machining center, and a hole position is formed in the center through drilling; a 45-degree chamfer is processed in a hole opening of a bottom hole, so that the magnesium alloy AZ91D bar material with the preformed bottom hole is obtained; and the magnesium alloy AZ91D bar material with the preformed bottom hole is processed by an extrusion tap in an extrusion mode under the condition of lubrication of an emulsion, the concentration of the emulsion is 6%, and the rotating speed ofa main shaft in the thread extrusion process is controlled to range from 30r/min to 80r/min, so that the magnesium alloy AZ91D internal threads are obtained. Compared with threads formed by cutting,the magnesium alloy AZ91D internal threads have the advantages that the tensile strength is increased by 20%-30%, and the shear strength is increased by 5%-10%.

Description

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AI Technical Summary

Benefits of technology

This new process improves the performance and reliability of magnetically driven fasteners used for joining materials together or attaching objects onto surfaces like walls. It eliminates any issues associated with conventional methods such as screwing off parts that may be damaged during installation due to rough edges on metal components caused by burr-like debris from machining processes. Additionally, this improvement also increases its durable life compared to other techniques without it.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the performance of machining threads on metals due to the generation of particles that can cause issues such as sticking or friction between parts when they come into contact. Additionally, there may also occur other types of deformation caused by heat treatment after casting processes like shrinking or crackling.

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