Novel mold for semi-solid slurry forming

Abstract

The invention provides a novel mold for semi-solid slurry forming. The mold is provided with a cavity and a sprue for forming a casting and is sequentially provided with at least three layers, namelyan outer layer, a middle layer and an inner layer from outside to inside. The mold has the advantages that three layers, namely the outer layer, the middle layer and the inner layer are arranged, themold is layered and is variable in wall thickness in the flowing direction, and therefore the novel mold is small in thermal capacity, large in temperature gradient, high in loading capacity and suitable for meeting the requirements of semi-solid extrusion forming, the upgrading cost can be conveniently lowered as long as the inner layer is replaced when a product has a small modification, the outer layer can be made of ordinary steel so that the mold cost can be lowered, and the mold is small in thermal stress, small in deformation and long in service life.

Description

technical field [0001] The invention belongs to the technical field of light alloy semi-solid forming. Background technique [0002] The semi-solid slurry is vigorously stirred during the solidification process of the metal to break the dendrites, and a solid-liquid mixed slurry that uniformly suspends some spherical solid phase particles is obtained. It has good fluidity and can be used in high pressure casting and squeeze casting. When filling, the gas is not easy to get involved, its forming temperature is low, the mold life is long, the deformation resistance is small, and the production efficiency is high; when forming, high pressure is applied to cause plastic deformation of the solidified metal, and the unsolidified metal continues to solidify under high pressure. The parts have less shrinkage cavity and shrinkage porosity, compact structure, higher mechanical properties than ordinary castings and close to forgings, can be heat treated, no riser feeding, and high met...

AI Technical Summary

Problems solved by technology

[0003] Although castings produced by semi-solid forming technology have many advantages, and there are many ways to prepare slurry, the continuous preparation, storage, transportation, and molding of low-cost and high-quality slurry have always been difficult problems, which seriously restrict the promotion and application of this technology.

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