V-method vertical modeling process and casting process

Abstract

The invention provides a V-method vertical modeling process. The V-method vertical modeling process comprises the following steps that films are pasted to and spraying is conducted on the surface witha sample of a forward pressure plate and the surface with a sample of a reverse pressure plate correspondingly; the film covered forward pressure plate, the film covered reverse pressure plate and asand box form a closed molding chamber, the sand box is positioned between the forward pressure plate and the reverse pressure plate, a vertical cavity is formed in the modeling chamber through compression of a hydraulic system, and a sand spraying opening is formed in the top surface of the sand box; dry sand is vertically sprayed into the modeling chamber through a sand spraying device, then vacuum pumping treatment is conducted on the modeling chamber, and the sand spraying device is positioned above the sand spraying opening; after the dry sand in the modelling chamber is compact, the forward pressure plate and the reverse pressure plate are separated from the sand box so as to obtain a mold block with mold cavities on the two sides; and the mold block is subjected to mold assembly with a previous mold block so as to obtain a sand mold, and the operation above is repeated to prepare a modeling line formed by the plurality of sand molds. According to the modeling process, the production speed is high, the efficiency is high, the service life of a mold and the service life of the sand box are long, and a prepared casting is smooth in surface, clear in contour and accurate in size.

Description

technical field [0001] The invention relates to the technical field of sand casting, in particular to a V-method vertical molding process and a casting process. Background technique [0002] Casting is a process in which solid metal is melted into a liquid and poured into a mold of a specific shape to solidify it into shape. Sand casting is a commonly used casting technology. V-method molding is a vacuum-sealed molding casting method, also known as negative pressure molding. At present, V-method horizontal molding is commonly used. The process flow is: (1) Preheating A good plastic film is sucked to the entire surface of the pattern and the mold under the action of negative pressure, and then the quick-drying paint is evenly sprayed on the film; (2) Put the sand box with the pumping chamber; (3) Fill it Add the dry sand with binder, moisture and additives, change the sand to slightly vibrate to ensure that the dry sand fills the sand box, scrape it flat, and cover the top w...

AI Technical Summary

Problems solved by technology

[0004] However, the horizontal molding operation of the V-method used in the prior art is complex, the production efficiency of small castings is low, and secondary processing of the riser is required; during the preparation process, two upper and lower boxes need to be covered with 4 films, and the number of times of film coating is large; Moreover, the unpacking needs to be turned over, and the upper and lower boxes need to be separated to shake off the sand.

In addition, the controllability of the V method horizontal molding temperature field is poor, and more coatings are required for making large castings

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