Manufacturing method for micro holes of additive manufacturing part

Abstract

The invention discloses a manufacturing method for micro holes of an additive manufacturing part. The manufacturing method comprises the following steps: step I, sealing an outlet end of a cavity structure with support while forming a part with the cavity structure through laser selective melting and additive manufacturing, and enabling the outlet end of the cavity structure to face towards a forming direction, thereby obtaining the part with the cavity structure; step II, drying the obtained part; step III, completely sealing the outlet end of the dried part with a sealing material; step IV,performing micro hole processing on the completely sealed part; step V, removing the sealing material and the support after micro hole processing is accomplished; and step VI, clearing powder in the cavity structure. The laser selective melting and additive manufacturing technical feature is adopted to take powder in a forming process as a cavity protective material to perform micro hole processing, so that a follow-up special material filling process is saved, and powder in the cavity is filled more compact, and therefore, damages and pollution on the inner wall of the cavity in a micro holeprocessing process can be affectively avoided.

Description

technical field [0001] The invention belongs to the technical field of laser selective melting and additive manufacturing, and in particular relates to a method for manufacturing tiny holes in additive manufactured parts. Background technique [0002] At present, typical parts such as aero-engine swirlers, nozzle casings, and turbine blades all have complex cavity structures. It is difficult to ensure that the small holes are less than The precision of tiny holes is high, and it is easy to be blocked by powder, and the surface roughness of the holes is poor. [0003] For additively manufactured parts with high requirements for micro-hole wall roughness and dimensional accuracy, micro-holes are generally processed by EDM, laser and other methods, but this method is easy to damage the opposite wall of the cavity when the micro-hole penetrates. Using special methods for protection or control, filling protective materials is a common solution, but for additive manufacturing ...

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Problems solved by technology

[0002] At present, typical parts such as aero-engine swirlers, nozzle casings, and turbine blades all have complex cavity structures. It is difficult to ensure that the small holes are less than The precision of tiny holes is high, and it is easy to be blocked by powder, and the surface roughness of the holes is poor

[0003] For additively manufactured parts with high requirements for micro-hole wall roughness and dimensional accuracy, micro-holes are generally processed by EDM, laser and other methods, but this method is easy to damage the opposite wall of the cavity when the micro-hole penetrates. Using special methods for protection or control, filling protective materials is a common solution, but for additive manufacturing parts with complex cavity structures, the filling and removal of protective materials are relatively difficult

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