Flaskless V-method casting process

Abstract

The invention discloses a flaskless V-method casting process, comprising the following steps of: respectively shaping to obtain an upper sand mould and a lower sand mould; closing the sand moulds; turning over the sand moulds; vertically casting and dismounting the sand moulds, wherein shaping processes of the upper sand mould and the lower sand mould are the same and comprise the following steps of: firstly, placing a shaping frame on a template and coating a film to tightly adhere a thin film on the surface of the template and the inner wall of the shaping frame; then filling sand, ramming and flatly shaving; then, covering a bottom plate capable of pumping gas on the shaping frame and vacuumizing by the bottom plate capable of pumping the gas so as to compactly cast; and finally, drawing and separating the shaping frame. Based on the traditional V-method process, the bottom plate capable of pumping the gas is used for replacing the gas pumping of the traditional sand box and thin film sealing is used for replacing the sealing effect of the sand box, thus saving the expensive manufacturing cost of the sand box; the flaskless V-method casting process has the advantages of simple configuration, convenience for maintenance, convenience for manufacturing and more flexibility in shaping; and meanwhile sand dropping is easier, more convenient and faster.

Description

technical field [0001] The invention relates to the field of casting, in particular to a boxless V-method casting process, which is suitable for small and medium-sized castings. Background technique [0002] As the third-generation molding method in the foundry industry, vacuum-sealed molding is gradually being used more and more widely due to its obvious advantages such as no binder in molding and simple sand treatment process. The types of castable materials include cast iron, cast steel and All kinds of non-ferrous alloys, and the size of castings ranges from a few kilograms to hundreds of tons. [0003] However, this casting process relies on vacuum to maintain the strength of the mold, so the vacuum structure of the sand box and the selection of other vacuum equipment are more important. Especially for some larger castings, the unreasonable design of the sand box structure often leads to the problem of box collapse defects. Therefore, the design difficulty and manufac...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of high design difficulty and high manufacturing cost caused by the sand box in the prior art, the present invention provides a boxless V-method casting process

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