In order to solve the problem that the 3D printing model replaces the wax model in the molten mold casting to result in the large expansion and fracture rate of the mold shell during investment casting

a kind of internal collapse melting mold structure based on the thermal property difference of materials was proposed.Taking the complex blade parts as an example

the internal collapse structure was embedded into the blade structure

and the sample was printed through 3D printing and the subsequent process design was combined with the subsequent dewaxing process.The results show that the compressive strength of the blade with internal collapse structure is significantly higher than that of the hollow structure

and the crushing rate of the shell with internal collapse structure is decreased significantly in the subsequent dewaxing process.