Sand core positioning structure and process design method thereof

Abstract

The invention discloses a sand core positioning structure and a process design method thereof, and relates to the technical field of casting production. The sand core positioning structure comprises a sand core body, a sand core end is arranged at the bottom of the sand core body, the top of the sand core end is fixedly connected with the bottom of the sand core body, and a sand core head structure is arranged at the bottom of the sand core end; the top of the sand core head structure is connected with the bottom of the sand core end in a close fit mode, a casting mold core head structure and a core bar are arranged outside the sand core head structure, and the inner wall of the casting mold core head structure is connected with the outer wall of the sand core head structure in the close fit mode. According to the sand core positioning structure and the process design method thereof, by using a core head, a sand core can be reliably positioned, and meanwhile, the core head has the functions of core marking, guiding, iron chilling and the like, so that the core head positioning problems of the sand core that the structure of the sand core head is small, the main body structure is thick and large, the gravity center of the sand core is not in the center of the core head, an inner cavity core and an upper sand mold are not in contact or the contact area is very small and the like are effectively solved; and the core assembly operation process is simplified.

Description

technical field [0001] The invention relates to the technical field of casting production, in particular to a sand core positioning structure and a process design method thereof. Background technique [0002] In the production process of some complex castings, there are often some sand cores: the core head structure is small, the main structure is thick, the center of gravity of the sand core is not the center of the core head, and there is no contact or contact area between the inner cavity core and the upper sand mold It is very small and cannot be rigidly fixed with the lower sand mold. When the molten metal enters the cavity, under the action of the buoyancy of the molten metal, the core of the inner cavity will experience drifting, deflection, etc., which will cause changes in the size of the casting and Fire and other conditions will seriously affect the quality of castings, and even lead to scrapping; at the same time, in the process design of some ductile iron, cast ...

AI Technical Summary

Problems solved by technology

[0002] In the production process of some complex castings, there are often some sand cores: the core head structure is small, the main structure is thick, the center of gravity of the sand core is not the center of the core head, and there is no contact or contact area between the inner cavity core and the upper sand mold It is very small and cannot be rigidly fixed with the lower sand mold. When the molten metal enters the cavity, under the action of the buoyancy of the molten metal, the core of the inner cavity will experience drifting, deflection, etc., which will cause changes in the size of the casting and Fire and other conditions will seriously affect the quality of castings, and even lead to scrapping; at the same time, in the process design of some ductile iron, cast steel and cast aluminum products, in order to control the solidification sequence of molten metal and reduce the modulus of hot joints, etc., to ensure the quality of castings Shrinkage level requirements, need to use cold iron

[0003] Most of the cold iron is placed in the center of the core head of the sand core, which coincides with the core head of the sand core and the position of the standard core, which greatly limits the positioning of the sand core, the use of the cold iron and the standard core of the sand core. Since the positioning of the core head made of molding sand is easily damaged during the process of taking out the model and core assembly, etc., resulting in inaccurate positioning of the core head or no positioning function, it will also be due to the gap between the sand core head and the mold during core assembly. There will be rubbing between them, causing the molding sand to enter the mold positioning structure, so that the sand core cannot be assembled in place

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