Precision casting forming method of thin-wall variable section casting

Abstract

The invention discloses a precision casting forming method of a thin-wall variable section casting. According to a structure of the casting, a bionic supplementary casting system is designed, whereinthe bionic supplementary casting system comprises a main casting channel, the upper end of the main casting channel is connected witha sprue cup / pool, the lower end of the main casting channel is connected with a plurality of sub casting channels, each sub casting channel is connected with an inner casting channel, and the inner casting channels are directly connected with the casting; according to the structure of the casting, the size of a common supplementary inner casting channel is designed reasonably, it is ensured that temperature fields in the inner casting channelsare higher than thatof asupplemented part of the casting, and thus a thick and large part of the casting is fully supplemented; the bionic supplementary casting systemand a casting wax mold are connected to be integrallyplaced in a box for modeling, and after dewaxing and roasting after modeling, the casting is obtained by casting metal liquid into a mold cavity. According to the precision casting forming method ofthe thin-wall variable section casting, the well-beddedbionic supplementary casting system is adopted, and theproblems that when castings with thin walls, multiple bosses and variable sections are produced in the prior art, scattered hot joints are difficult to supplement and porosity shrinkage is prone to forming due to existence of many isolated hot jointsare solved.

Description

technical field [0001] The invention belongs to the technical field of casting forming, and in particular relates to a precision casting forming method of thin-wall variable-section castings. Background technique [0002] For gravity casting and die casting methods, the method of strengthening cooling or strengthening feeding is usually used to improve the problems of shrinkage cavity and shrinkage defects inside the casting, and improve the density of the casting. However, most of the thin-walled variable-section castings are thick during the sequential solidification process, and the center of the final solidified part cannot reliably avoid the existence of shrinkage porosity. Especially for thin-walled, complex (multi-rib, boss or hollow structure, etc.) and castings with local cross-sectional changes that are precision-formed by investment casting, it is not suitable to use cold iron for chilling due to the number of isolated hot spots (due to complex structure processin...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a precision casting forming method for thin-walled variable-section castings, which adopts a well-defined bionic feeding and shrinkage pouring system to solve the problems caused by the isolated There are many hot spots, and it is difficult to establish a complete sequential solidification temperature field during solidification, resulting in the difficulty of distributing hot spots and shrinkage and easy formation of shrinkage cavities and shrinkage porosity

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