Vacuumized negative pressure molding mould

Abstract

The invention discloses a vacuumized negative pressure molding mould. The vacuumized negative pressure molding mould comprises a sand mould frame, a sand box and a bottom box which are sequentially arranged from top to bottom, and at least two thin films are arranged on the mould; the sand mould frame is of a rectangular frame structure with an inner cavity, the sand box and the bottom box are corresponding up and down and spliced to form a vacuumized negative pressure box, a rectangular sinking slot is formed in the upper end face of the sand box, the slot edge of the sinking slot is matchedwith the bottom margin of the sand mould frame, a plurality of air holes are formed in the slot bottom surface of the sinking slot and the inner side surface of the sand mould frame respectively, anda porous plug is arranged in each air hole; a sand mould is arranged in the sinking slot; the sand mould frame and the vacuumized negative pressure box are respectively connected with a negative pressure system by virtue of an air pipe; and the area of the thin films is larger than the area of the upper end face of the sand box. The vacuumized negative pressure molding mould disclosed by the invention is simple in structure and easy to operate, molding sand in the sand box is compacted by adopting a vacuumizing manner, smoothness of the surface of a cavity of the sand mould is guaranteed, andfurther the yield of cast and moulded castings is guaranteed.

Description

technical field [0001] The invention relates to a molding die, in particular to a vacuum negative pressure molding die. Background technique [0002] At present, the molding mold is used as a molding equipment for manufacturing sand molds, and it mainly includes a sand box and a sand mold for forming a cavity in the sand mold, wherein the sand mold is arranged in the sand box. The manufacturing of sand molds by molding molds includes the following steps: (1) filling sand, filling loose molding sand into the sand box; The loose molding sand in the box is compacted, so that the sand mold has the necessary strength during the process of handling and pouring; (3) The mold is lifted, and the pattern is taken out of the compacted sand mold by using different mechanisms. [0003] However, in the manufacture of sand molds, it is found that mechanical sand compaction methods such as vibration compaction, compaction, shock pressure, and injection pressure not only need to be equipped...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of mechanically compacting the molding sand in the sand box when the current molding mold is used to manufacture sand molds, which requires a lot of auxiliary equipment, time-consuming and laborious operation, and cannot ensure the smoothness of the surface of the manufactured sand mold cavity. To solve the problems of stability and flatness, a vacuum negative pressure molding mold is provided for this purpose

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