Flask for lost foam casting

Abstract

This patent belongs to the technical field of mold making, and specifically discloses a sand box for lost foam casting, including a box body. The bottom of the box body is provided with a plurality of suction pipes arranged side by side. For the connecting pipe connected to the adjacent suction pipe, the side wall of the suction pipe is provided with a suction hole, and the outer wall of the suction pipe is provided with an elastic member, and the end of the elastic member is installed with a Block in the air suction hole; the inner wall of the air suction pipe is provided with a flexible part, one end of which is fixed on the inner wall of the air suction pipe, and a steel ball is installed on the other end; the inner wall of the air suction pipe There is also a rotating shaft connected to it in rotation, on which blades and cams for striking steel balls are arranged.

Description

technical field [0001] The invention relates to the technical field of mold making, in particular to a sand box 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 to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding. Down pouring, the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method. [0003] The lost foam casting technology has the advantages of good surface quality of casting products, less machining allowance, and low production cost, so it is widely used. During the lost foam casting process, the sand box needs to be vacuumed. Therefore, the impact of the structure, airtightness and evacuation channel of the flask on the lost foam casting is very important. In the existing structure of the flask...

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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