A Composite Additive Manufacturing Method for Conformally Cooling Molds

Abstract

The invention discloses a compound additive manufacturing method for a conformal cooling mold, which belongs to the field of additive manufacturing. In the manufacturing process of the complex cavity structure, the present invention adopts the pipe material as the supporting condition. Firstly, the circular arc shape with the same outer diameter as the cooling pipeline is numerically processed on the forged base material and beveled, and the pipe material is placed in the groove and welded. Positioning and fixing; Then adopt the method of high-efficiency arc surfacing welding, and swing along the direction perpendicular to the pipe axis to add material to manufacture the middle layer material; finally, adopt laser synchronous powder feeding process to form dense and defect-free surface on the thick surface of the surfacing layer CNC milling hardened layer. The invention adopts the positioning support method of the pipe, which can realize the direct forming of the structure including the flow channel without changing the pose, and adopts the surfacing welding process in the process of adding material for the large-size intermediate layer material, which can significantly increase the material adding rate.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a composite additive manufacturing method for 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, because of its relatively high material utilization rate, small machining allowance after forming, and high process flexibility. Applications in aerospace and other fields are becoming more and more extensive, and compared with powder-spreading additive manufacturing, complex cavity structures can be formed. However, powder-fed additive manufacturing additive processes are often not possible for unsupported overhanging surfaces. [0003] At present, the mold structure represented by injection mold has extremely high requirements on surface quality and cooling performance. To achieve high-effici...

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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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