An integrated forming method for parts with multi-material gradient lattice structure

Abstract

The invention belongs to the field of rapid manufacturing, and discloses an integrated forming method for parts with a multi-material gradient lattice structure, comprising the following steps: (1) preparing an aluminum-based composite powder suitable for SLM forming: combining aluminum alloy powder with a reinforcement The particles are mixed in various mass ratios and then ball milled for each part of the aluminum-based composite powder; (2) Fix the aluminum substrate on the forming table of the SLM equipment to preheat the aluminum substrate; (3) Replace the molded parts with different components The aluminum-based composite powder is used to form the upper layer, thereby manufacturing a multi-material gradient lattice structure part with continuously changing structure and composition; (4) cooling the part and performing wire cutting to obtain a gradient lattice structure part. The aluminum-based composite powder of the present invention has uniform distribution and good interfacial bonding, which solves the problem of interface mismatch between metal and ceramics, and eliminates sudden changes in the interface, eliminating the sudden change in physical properties caused by the sudden change of interface, reducing the thermal stress.

Description

technical field [0001] The invention belongs to the field of rapid manufacturing, and more specifically relates to an integrated forming method for parts with a multi-material gradient lattice structure. Background technique [0002] With the advancement of mechanical fields such as aerospace, ships, and automobiles, materials have become a key factor restricting their development, especially for high-performance components serving in harsh environments, which have stricter requirements on structure and performance. Taking the insulation layer of the cabin of a high-speed aircraft as an example, as the flight speed increases, its aerodynamic heating environment becomes more and more severe. When the flight speed increases from 5 Mach (Ma) to 7 Ma, the surface temperature of the large area of ​​the substrate increases from 650 ° C to 1800 ° C; when the speed increases to 10 Ma, the external temperature can increase to 2200 ° C, however, the temperature in the cabin must not b...

AI Technical Summary

Problems solved by technology

Although SLM has a very high energy density, the absorption of aluminum to laser light is very low, for example, the absorption rate of laser light with a wavelength of 1um is about 7%, and it is very easy to oxidize during processing, and the bonding of the interface between composite materials is also difficult to control , which brings difficulties to the formation of lattice structures of aluminum matrix composites

Images