Material additive manufacturing method of square hole pipeline aluminum alloy part

Abstract

The invention discloses a material additive manufacturing method of a square hole pipeline aluminum alloy part. The material additive manufacturing method of the square hole pipeline aluminum alloy part includes: first, performing modeling and hierarchy slicing for the square hole pipeline aluminum alloy part, then feeding raw material into a 3D (three dimensional) printing device for melting, printing and shaping, and finally obtaining the square hole pipeline aluminum alloy part. The material additive manufacturing method of the square hole pipeline aluminum alloy part converts horizontal plane printing to oblique plane printing, achieves material additive manufacturing of the square hole pipeline aluminum alloy part on the premise of meeting accuracy of the inner wall of a square hole pipeline, obtains a uniform and compact surface for the square hole pipeline aluminum alloy part manufactured through simple scanning and chessboard scanning modes, avoids surface defects in machining,simplifies the manufacturing process, shortens a manufacturing period, achieves one-time integral shaping for the square hole pipeline aluminum alloy part, and greatly improves production efficiency.

Description

technical field [0001] The invention belongs to the technical field of parts manufacturing, and in particular relates to an additive manufacturing method for aluminum alloy parts of square-hole pipes. Background technique [0002] In the process of additive manufacturing, that is, laser 3D printing, aluminum alloys are prone to air holes and air gaps, and cracks are prone to occur at the edge joints of parts. At the same time, the aluminum alloy has a strong reflection effect on the laser, which is due to the high density of free electrons in the aluminum alloy in the solid state, and it is easy to interact with the photons in the beam to reflect the energy. In addition, aluminum alloys have strong thermal conductivity, resulting in very low absorptivity of aluminum alloys for laser light. In the manufacture of aluminum alloy parts with square holes, supports cannot be added inside the long holes of the parts. First, it is difficult to remove the supports. Second, the inner...

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Problems solved by technology

This method has complicated procedures. During the casting process, due to the characteristics of the aluminum alloy itself, more oxides and shrinkage cavities are prone to occur. The oxides in the aluminum alloy react with air at high temperatures to produce hydrogen, and are supersaturated after the temperature is lowered. Hydrogen precipitation will cause closed cells inside the part, which will seriously affect the mechanical properties of the part

Moreover, the casting process has high energy consumption, long production cycle, and requires the manufacture of molds

In the process of cutting and processing the square hole pipe, the cutting position is prone to errors. When the two parts are welded together after machining, a heat-affected zone with coarse grains will also be generated in the weld area, resulting in local mechanical damage. The performance is reduced, which makes the comprehensive mechanical properties of the part itself worse

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