Sand box for lost foam casting

Abstract

The invention belongs to the technical field of die manufacturing and particularly discloses a sand box for lost foam casting. The sand box comprises a box body. Multiple air suction pipes distributed in parallel are arranged at the bottom of the box body. A connecting pipe used for being communicated with the adjacent air suction pipes is arranged in the box body. Air suction holes are formed in the side walls of the air suction pipes. Elastic pieces are arranged on the outer walls of the air suction pipes. Stop blocks for preventing protective sand from falling into the air suction holes are installed at the ends of the elastic pieces. Flexible pieces are arranged on the inner walls of the air suction pipes. One end of each flexible piece is fixed to the inner wall of the corresponding air suction pipe and the other end of each flexible piece is provided with a steel ball. Rotary shafts rotationally connected with the inner walls of the air suction pipes are arranged on the inner walls of the air suction pipes. Each rotary shaft is provided with blades and a cam used for impacting the corresponding steel ball.

Description

technical field [0001] The invention relates to the technical field of mold making, in particular to a flask for lost foam casting. Background technique [0002] Lost foam casting (also known as solid casting) is to bond and combine paraffin or foam models similar in size and shape to castings into model clusters. After brushing refractory paint and drying, they are buried in dry quartz sand and vibrated for modeling. The new casting method is a new casting method in which the model is gasified by pouring down, and the liquid metal occupies the position of the model, and solidifies and cools to form a casting. [0003] The lost foam casting technology has the advantages of good surface quality of casting products, less machining allowance, and low production cost, and is widely used. During the lost foam casting process, the sand box needs to be evacuated. Therefore, the influence of the structure, airtightness and evacuation channel of the sand box on the lost foam casting...

AI Technical Summary

Problems solved by technology

Therefore, the structure, airtightness and evacuation channel of the flask are very important to the lost foam casting. In the existing flask structure, steel pipes with holes are installed on the inner liner of the flask. The thermal insulation sand is easy to fall into the steel pipe. After a long time, the steel pipe will be blocked by the fine thermal insulation sand, resulting in poor evacuation effect and affecting the normal casting process. , and the existing sand boxes are mostly welded by steel plates, welding defects are prone to appear at the welds, resulting in air leakage, which affects the vacuum degree in the casting process and affects product quality

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