Multi-point directional extrusion casting method applicable to nonuniform wall thickness complex casting

Abstract

The invention relates to a multi-point directional extrusion casting method applicable to nonuniform wall thickness complex casting. The method comprises the steps that an extrusion casting die is adopted for applying multi-point directional pressure to the nonuniform wall thickness complex casting to be solidified. An extrusion casting device comprises a movable die structure, a fixed die structure and a pressure applying structure. The movable die structure comprises a movable die base plate and a plurality of pressure applying punches. The lower bottom faces of the pressure applying punches and the movable die base plate are connected to form an upper cavity. The pressure applying structure is arranged above the movable die structure. The middle of the pressure applying structure is provided with a plurality of pressure applying rods. The pressure applying rods are arranged above the pressure applying punches correspondingly. According to the method, multi-point directional medium and low pressure is applied to the nonuniform wall thickness complex casting to be solidified, the defect that the wall thickness position of the casting is likely to produce shrinkage porosity in the solidifying process is overcome, the casting internal structure tightness is improved, and therefore casting quality is improved.

Description

technical field [0001] The invention relates to the technical field of metal casting forming technology, in particular to a multi-point directional extrusion casting method suitable for complex castings with non-uniform wall thickness. Background technique [0002] With the continuous improvement of squeeze casting research level and product research and development level, the application fields of squeeze casting products are becoming more and more extensive, and more and more attention has been paid by the foundry industry. Its application fields have also expanded from the initial military industry to various civilian uses. In the industrial field, it has now become an important process for the production of auto parts. With the development of the automobile industry, the automobile industry has higher and higher requirements for casting parts. Defects such as pores and shrinkage in ordinary die-casting technology have seriously affected the overall performance of casting...

AI Technical Summary

Problems solved by technology

However, squeeze casting has its own disadvantages. For example, conventional squeeze casting has a high molding pressure, reaching 100MPa, which makes it very demanding on equipment and molds, and increases costs; and because it is impossible to add cores, the range of applicable casting shapes and sizes is limited, etc.

[0003] At present, the development of castings has become more diversified, and its structure is becoming more and more complex, and the difference in wall thickness at different parts is also increasing. For these castings with complex structures and different wall thicknesses, the castings will solidify first at the thinnest part, and Free solidification and shrinkage at the thick wall are easy to form defects such as shrinkage and shrinkage cavities

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