The concept of liquid die forging

Liquid die forging is an emerging process that combines casting and forging. It not only has the advantages of simple casting process, low production cost, and complex shapes of workable parts, but also has the characteristics of fine grains, uniform structure, good mechanical properties, and high forming accuracy of die forging products. The main points are as follows:

(1) During the forming process, the unsolidified molten metal crystallizes, solidifies, and flows under the action of isostatic pressure from beginning to end; the solidified metal layer undergoes plastic deformation under pressure and has a thermal deformation structure with fine grains and uniform structure. At the same time, the pressure makes the outside of the workpiece close to the inner wall of the mold, making the shape and size of the workpiece accurate.

(2) Since the plastic deformation of the first crystallized solidified layer consumes part of the energy, the isostatic pressure experienced by the molten metal is not a constant value, but decreases as the solidified layer thickens.

(3) The solid-liquid zone is forced to shrink under pressure, which can eliminate defects such as shrinkage holes and loose porosity inside the part, and improve the mechanical properties of the part.

(4) Compared with ordinary hot die forging, the fluidity of molten metal is much greater than that of solid metal, and the performance of filling the mold cavity is better. It can form parts with relatively complex shapes at one time using one mold.

(5) Density and mechanical properties are basically the same as physical forgings.