Extrusion die-casting machine and extrusion die-casting process thereof

Abstract

The invention discloses an extrusion die-casting machine and an extrusion technology and die-casting technology combined extrusion die-casting process of the extrusion die-casting machine. The extrusion die-casting machine further comprises a small-stroke extrusion oil cylinder arranged on the outer side of a fixed die seat plate, a piston of the small-stroke extrusion oil cylinder moves to push an extrusion rod and directly extrudes a metal forming material stored in a storage space at the front part of the extrusion rod, so that the metal forming material enters a mold cavity, and performs local extrusion forming on the thickness direction of a semi-solid casting formed in the mold cavity. The extrusion die-casting machine has the advantage of being high in production efficiency, and meanwhile, has the function of reducing or eliminating shrinkage porosities and shrinkage cavities in thick part of a casting through an extruding method, so that the performance of the casting is obviously improved, and the machine is particularly suitable for manufacturing large-scale die castings. According to the extrusion die-casting machine and the extrusion die-casting process thereof, the structure is simple, the production cost is relatively low, and the effects of being stable and reliable are achieved; and the process method is convenient to operate, high in universality, easy to popularize and apply in the industry and wide in market application prospect.

Description

technical field [0001] The invention belongs to the technical fields of squeeze casting and pressure casting, and more specifically relates to a squeeze die-casting machine and a squeeze die-casting process which can obviously improve the performance of castings. Background technique [0002] With the continuous development of die-casting technology, higher requirements are put forward for the mechanical properties, complex procedures, and appearance of castings. In die-casting, especially for large-scale die-castings, there are more molten metals in the mold cavity. , it is relatively prone to shrinkage and porosity. Although there is a pressurization process in the die-casting process, for large castings, due to the heat accumulated in the molten metal in the thick and large parts of the cavity, the molten metal in this part solidifies Slower than other parts, the surrounding parts close to the cavity wall are solidified first, and a closed liquid pool is formed in the cen...

AI Technical Summary

Problems solved by technology

Its shortcoming is that the piston of the extrusion cylinder pushes the side slider, and then pushes the extrusion core. The extrusion force is not directly extruded on the casting, and the direction of the force is changed by 90 degrees before it acts on the thickness direction of the casting; in addition Its structure is more complex, and each set of mold must be separately installed on the fixed platen with oblique pins, wedge blocks, movable mold cores, side sliders, extrusion cores, brackets, and extrusion cylinders, so the cost of the mold is high and the versatility is poor.

However, the molding part can only be pressurized as a whole through the mold. When the projected area of ​​the part is large, the extrusion force required is very large. If the tonnage of the equipment used is not enough, the extrusion effect will not be significant, or the pores cannot be eliminated. Shrinkage cavity, shrinkage porosity and other casting defects; if a large-tonnage equipment is used, additional energy will be consumed, which will increase manufacturing costs; and it is difficult to accurately control the reserved clearance when closing the mold

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