A metal semi-solid melt extrusion additive manufacturing nozzle

Abstract

The invention provides a metal semi-solid state melt extrusion additive manufacturing spraying nozzle. The metal semi-solid state melt extrusion additive manufacturing spraying nozzle comprises a containing cavity and a stirring screw rod, wherein the stirring screw rod is coaxially arranged in the containing cavity in a clearance mode; the containing cavity is in a cylindrical shape with a variable cross section, and the diameter of the upper cylinder is larger than that of the lower cylinder; the upper cylinder and the equal-height part of the stirring screw rod form a material melting storage cavity; a plurality of semi-solid state material forming cavities which are gradually reduced by degrees are formed by the lower cylinder and the equal-height part of the stirring screw rod; a supporting frame which is provided with a feeding bin is fixedly arranged at the upper end of the containing cavity, an extrusion spraying nozzle is arranged at the lower end of the containing cavity, anda multi-section type resistance heating assembly, a multi-section water cooling ring assembly and a temperature control system are arranged on the outer side of the containing cavity correspondingly;the supporting frame is provided with a bearing system used for assembling the stirring screw rod, and a feeding assembly communicating with the feeding bin; a driving end of the stirring screw rod is connected with an output end of a speed reducer and the output end of a driving motor, and a free end of the stirring screw rod is in clearance fit with the extrusion spraying nozzle to be used forsqueezing the semi-solid state metal out. According to the metal semi-solid state melt extrusion additive manufacturing spraying nozzle, melt extrusion and forming of a light metal structural materialof aluminum / magnesium alloy with a relatively low melting point are realized.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a metal semi-solid melt extrusion additive manufacturing nozzle. Background technique [0002] Additive manufacturing (commonly known as 3D printing), which integrates multi-disciplinary fields such as 3D model design, material processing and forming, machinery, automatic control, etc., is based on the principle of discrete accumulation, and is based on digital model files. The advanced manufacturing technology of accumulating layer by layer and manufacturing solid parts is not restricted by the geometry and structure of the parts, and can realize the rapid manufacture of complex structural parts. Therefore, it is widely used in mold manufacturing, industrial design, aerospace, biomedical and other fields. [0003] Materials are the material basis of 3D printing, and the performance of materials determines 3D printing technology. At present, according to the diff...

AI Technical Summary

Problems solved by technology

However, there are problems: the forming process uses metal materials to make spherical fine powder with a particle size of micron or wire with a diameter of about 1 mm, and the requirements for composition are very strict, resulting in a substantial increase in raw material costs; melting metal under the action of high-energy beam high temperature , Metal materials are easy to oxidize, especially aluminum alloys and magnesium alloys, which need to be carried out under a high-purity inert gas atmosphere, which consumes a large amount of inert gas, increases the forming cost, and the formed parts are prone to slag inclusions, resulting in reduced mechanical properties; high-energy beams as Heat source, heat source system is expensive and maintenance cost etc.

The high cost of metal material additive manufacturing using high-energy beams, and the easy oxidation of the forming process hinder the widespread promotion and application of metal material additive manufacturing technology.

[0007] In summary, the existing FDM technology with simple forming process and low cost is limited to forming thermoplastic polymer materials and low-melting point alloys, and 3D printing of metal materials has complex structure of forming equipment and high cost, which limits its popularization and application. The problem

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