Method for preparing small-aperture magnesium alloy pipe fitting

Abstract

The invention discloses a method for preparing a small-aperture magnesium alloy pipe fitting. The method comprises the following steps of: putting a qualified magnesium alloy straight pipe raw material pipe into a band sawing machine, and processing a standard magnesium alloy straight pipe blanket according to a material preparation size; uniformly smearing a lubricating agent, preheating to 60 to 100 DEG C, and keeping the heat for 10 to 20min; quickly putting the preheated magnesium alloy straight pipe blanket into a bent pipe cold-pushing forming machine, starting a jacking rod to gradually pressurize the magnesium alloy straight pipe blanket, when a magnesium alloy straight pipe reaches a required bent angle, opening a die, and taking the pipe blanket down; performing destressing and annealing on the bent pipe blanket, and finally taking out the pipe blanket to prepare the magnesium alloy pipe fitting. By the method, the texture compactness and uniformity of the magnesium alloy pipe fitting are improved, and the mechanical property of the pipe fitting is improved; and the method is particularly suitable for preparation of high-quality and small-size magnesium alloy pipe fittings required in the industrial field such as aerospace, automobiles, 3C products and nuclear power.

Description

technical field [0001] The invention relates to a preparation method of a pipe fitting, in particular to a preparation method of a high-quality small-diameter magnesium alloy pipe fitting. Background technique [0002] With the rapid development of modern industry, people have higher and higher requirements for the reliability of pipe fittings, and at the same time, the requirements for the comprehensive performance and special performance of alloys are constantly increasing. Existing pipe fittings can no longer fully meet the requirements and pursuits of use, and pipe fittings made of high-performance magnesium alloys have attracted widespread attention because of their excellent performance. And as energy and environmental protection issues are being paid more and more attention by countries all over the world, the United States, Europe and Japan have established strict automobile emission and fuel saving standards, which force automobile manufacturers to produce products ...

AI Technical Summary

Problems solved by technology

[0004] Magnesium alloy casting includes sand casting, metal casting, investment casting, squeeze casting, low pressure casting and high pressure casting, etc. Among them, the die casting process is the mainstream of magnesium alloy parts manufacturing, but the die casting process has the following problems: 1. The process requires Specific high-end die-casting equipment has high requirements for equipment; 2. The forming temperature is relatively high, generally between 200 ° C and 300 ° C, and the thermal conductivity of magnesium alloy is good, and the heat is lost quickly. Heating during the forming process, It is difficult to keep warm, which leads to high energy consumption and high processing cost, which does not meet the modern low energy consumption requirements; 3. Magnesium is an element with very active chemical properties, and it is easy to react with oxygen, carbon dioxide and other gases in the air at high temperatures , so that the die-casting parts introduce impurities and reduce the performance, so the die-casting process requires strict protective measures, the protection cost is high, and the protection is difficult; 4. Often due to the problems of die-casting equipment, molds, process parameters and specific operations, the die-casting parts It is relatively easy to produce casting defects such as incomplete filling, cold shut, porosity, shrinkage cavity, void, flow mark, hot crack, deformation and distortion

Because the chemical properties of magnesium are very active, it is difficult to protect from high temperature, the cost of protection is also high, the process is complicated, and the energy consumption is large