Sand box for expendable pattern casting process

Abstract

The invention relates to a sand box for an expendable pattern casting process, which comprises an outer box body, an inner box body and a ventilation mechanism, wherein the inner box body is arrangedin the outer box body; the ventilation mechanism is arranged between the outer box body and the inner box body; ventilation holes are uniformly formed in the front, rear, left and right side walls ofthe outer box body and the inner box body; the positions of the ventilation holes formed in the outer box body correspond to the positions of the ventilation holes formed in the inner box body one toone; the ventilation holes are elongated holes; the two ends of each ventilation hole are arc surfaces; and the ventilation mechanism comprises a mounting frame, sand isolating plates, a ventilation frame, a transverse connecting square pipe, a vertical connecting square pipe, a butt joint pipe and an adjusting screw. According to the invention, a vacuumizing position can be changed within a certain range in a vacuumizing process so as to improve the uniformity of tightness of each part of a sand mold. An installation rack is used for connecting the sand isolating plates, so that the steps ofassembling and disassembling the sand isolating plates are reduced. The sand is discharged from the bottom after molding, so that the production input cost and the working strength are reduced.

Description

technical field [0001] The invention relates to the field of casting equipment, in particular to a sand box for a lost foam casting process. Background technique [0002] Lost foam casting is to bond and combine paraffin or foam models similar in size and shape to castings to form model clusters. After brushing refractory paint and drying, they are buried in dry quartz sand for vibration modeling, and poured under negative pressure to vaporize the model. , a new casting method in which liquid metal occupies the position of the model, solidifies and cools to form a casting. [0003] The sand box is the key equipment in the production of lost foam casting. According to different uses, it is divided into complex sand box and simple sand box. There are some problems in the use of existing sand boxes for lost foam: [0004] a. Before pouring the metal liquid into the sand box, it is necessary to carry out a vacuuming operation to keep the negative pressure in the sand box, so t...

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Problems solved by technology

[0004] a. Before pouring the metal liquid into the sand box, it is necessary to carry out a vacuuming operation to keep the negative pressure in the sand box, so that the sand mold can have a certain degree of compactness, which is beneficial to the casting molding, but due to the vacuum position in the sand box It is often fixed and cannot guarantee the uniformity of the vacuum degree in the sand box, resulting in inconsistent compactness of the sand mold. During the pouring molding process, the part with poor compactness is prone to box collapse;

[0005] b. In order to prevent the molding sand from clogging the vacuum pipe during the vacuuming process, a sand screen is often installed between the pipe and the sand box. The sand screen is usually installed on the side wall of the sand box through bolts and other joints, and the operation is cumbersome when dismounting , time-consuming;

[0006] c. After molding, it is necessary to use mechanical equipment or manual methods to turn the sand box 180 degrees to pour out the molding sand, and then take out the casting, which increases the work cost and labor intensity

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