Composite additive manufacturing method of conformal cooling die

Abstract

The invention discloses a composite additive manufacturing method of a conformal cooling die, and belongs to the field of additive manufacturing. During the manufacturing process of a complex cavity structure, a pipe is adopted as a supporting condition. The composite additive manufacturing method comprises the following steps of at first, machining a circular arc-shaped trough, which is identicalto the external diameter of a cooling pipeline, in a forged base material in a numerical control manner, and forming grooves; placing the pipe in the trough, and performing welding orientation and fixing; swinging an additive manufacturing intermediate layer material in the direction perpendicular to the axial direction of the pipe by adopting a high-efficiency arc surfacing manner; and finally,milling a thick surface of a surfacing layer in a numerical control manner, and adopting a laser synchronous powder feeding process to form a compact and flawless hardened layer. The composite additive manufacturing method adopts a pipe positioning and supporting way, can realize invariable pose direct molding of a runner-containing structure, adopts a surfacing process in the manufacturing process of a large-size intermediate layer material additive, and can remarkably increase the additive speed.

Description

Technical field [0001] The invention belongs to the technical field of additive manufacturing, and specifically relates to a composite additive manufacturing method of conformal cooling molds. Background technique [0002] The current powder-feeding additive manufacturing is mainly used in the near-net-size forming of solid parts such as large structures and thin-walled structures. Due to its relatively high material utilization rate, small machining allowances after forming, and high process flexibility, the advantages are The application in aerospace and other fields is becoming more and more extensive, and compared with powder-spreading additive manufacturing, it can achieve complex cavity structure forming. However, the powder-feeding additive manufacturing additive process is often not possible for unsupported overhangs. [0003] At this stage, the mold structure represented by the injection mold has extremely high requirements for surface quality and cooling performance. To ...

AI Technical Summary

Problems solved by technology

[0005] The processing efficiency of the injection mold can be greatly improved through the conformal cooling mold manufactured by additive manufacturing, but the surface precision of the mold produced by additive manufacturing is not high, and the required surface precision must be obtained through post-finishing and polishing.

At this stage, foreign researchers have also proposed that complex displacement technology can be used to realize the powder-feeding additive manufacturing technology to directly form the cavity structure of the mold, but the cavity structure manufactured by this method often has poor shape regularity of the upper arm of the cavity and irregular inner walls. smooth

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