A V method casting process

Abstract

The invention relates to a novel V method casting process, belonging to the technical field of V method casting. The invention aims at providing the novel V method casting process which removes an air vent, adopts negative pressure to control the casting process, and has low defective rate of products and high product yield of process. The novel V method casting process comprises the following steps: respectively installing an upper mold plate and a lower mold plate on two stations, wherein vent holes in the mold plates and mold samples are smooth; baking a film of a mold cavity; when the film is heated to a mirror plane, causing a landing gear to drop down, and opening a vacuum valve for negative-pressure film coating; spraying paint on the film and blow-drying the film; placing the film on a sand box and the mold plates for vibrated sand filling and slicking the top surface of the box; putting a back film, inserting a negative-pressure tube vacuum-pumping system into the sand box, and meanwhile cutting off vacuum on the mold plates; turning over the box, setting a core; manufacturing an upper box by the same method; carrying mold assembly and pouring, wherein the negative-pressure tube vacuum-pumping systems are inserted into the upper box and a lower box in the pouring process. The novel V method casting process can be widely applied to casting.

Description

technical field [0001] The invention relates to a V-method casting process and belongs to the technical field of V-method casting. Background technique [0002] V method casting is also called negative pressure casting or vacuum casting. It uses vacuum pressure to cover the heated and plasticized plastic film on the pattern or template, fills the box with dry sand without adhesive, and then uses the plastic film to cover the sand mold. The top surface is sealed, vacuumized, the sand mold is compacted, the mold is lifted, the core is lowered, the mold is fitted, and the casting is cast until it solidifies. [0003] V-method casting technology has been introduced into my country for more than 30 years. This environmentally friendly and novel casting process has made great progress. or riser), but the defects such as pores, slag inclusions, shrinkage porosity, and negative pressure loss caused by vent holes (or risers) have not been fundamentally resolved, resulting in the defe...

AI Technical Summary

Problems solved by technology

[0003] V-method casting technology has been introduced into my country for more than 30 years. This environmentally friendly and novel casting process has made great progress. or riser), but the defects such as pores, slag inclusions, shrinkage porosity, and negative pressure loss caused by vent holes (or risers) have not been fundamentally resolved, resulting in the defective rate of V-method casting products High, low process yield, making people suspicious of V-method casting technology, and damaging the image of V-method casting, an advanced process

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