Gradient-type supporting method for selective laser melting forming of three-dimensional flow shrouded impeller

Abstract

The invention provides a gradient-type supporting method for selective laser melting forming of a three-dimensional flow shrouded impeller. In the process of selective laser melting forming of the three-dimensional flow shrouded impeller, supporting structures of different strength are designed according to the distance from the forming part of the impeller to the opening part of the impeller andthe magnitude of an overhanging angle. Aiming at the structural characteristics of the three-dimensional flow shrouded impeller, a gradient-type supporting structure is designed according to the length from different parts of an inner cavity of the impeller to the opening part of the impeller and the overhanging angle. Under the condition that deformation in the process of selective laser meltingforming of the impeller is effectively controlled, the supporting strength is locally reduced, the supporting forming time is shortened, the difficulty of supporting removal is reduced, the workload is reduced, and the overall manufacturing cycle of the impeller is shortened.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing, in particular to a gradient support method for a three-dimensional flow closed impeller formed by laser selective melting. Background technique [0002] With the development of ternary flow theory and its related application technologies, ternary flow impellers have been used more and more in the design of advanced turbopump impellers. Since the design of the ternary flow theory is closer to the real motion of the fluid relative to the impeller, the impeller designed and manufactured based on the ternary flow theory has higher working efficiency, which is of great significance for energy saving and emission reduction. [0003] In recent years, with the continuous improvement of the design and manufacturing technology level, on the basis of the three-dimensional open impeller, a wheel cover is added, and the wheel cover, the blade and the wheel disc are designed into an integr...

AI Technical Summary

Problems solved by technology

[0010] For the three-dimensional flow closed impeller with a complex inner cavity structure, the flow channel between each blade is a continuous part that needs to be supported, and the hanging angle of the added support part is not fixed, and the tendency of collapse and deformation is also not fixed , and there are many parts that are difficult to machine in the flow channel, so when designing the support, designing a single support structure for the continuous parts in the flow channel that need to be supported cannot effectively control deformation and be easy to remove

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