Casting sand core hot box and sand core molding method

Abstract

The invention discloses a casting sand core hot box and a sand core molding method. According to the hot box, the middle of a movable mold cavity is fixedly connected with a short part of a conical bar; a long part of the conical bar is a conical cylinder; the long part of the conical bar is connected with a filling piece; the filling piece is connected to the conical bar; a conical columnar hole is formed in the middle position of the filling piece; the filling piece is connected with the conical bar through the conical columnar hole; a center line of the conical bar is perpendicular to a mold clamping line of the hot box, and the sand core is molded according to a sequence of adding the filling piece, clamping the mold, sand adding, sand ejection, heating, swinging and rotating, cooling, opening the clamp and taking out the mold. With the adoption of refractory matters and other intermediate filling pieces, a small amount of laminating core sand is used, the production cost is reduced, exhaust is promoted in the casting process, defects are reduced, and the yield of the product is improved.

Description

technical field [0001] The invention relates to a sand core hot box and a molding method, in particular to a casting sand core hot box and a sand core molding method, belonging to the field of casting. Background technique [0002] The inner cavity of the casting requires a smooth and smooth surface, which means that the quality of the inner cavity of the casting is related to the quality of the product. In order to obtain the shape of the casting, it is necessary to make a sand box mold with other easy-to-form materials in advance, and use the sand box mold to form a sand box. , and then put the sand core into the sand box. The space formed between the sand box and the sand core is in the shape of a casting. In this cavity, fluid molten iron is poured, and the desired product can be formed after the molten iron cools and solidifies. One of the methods of sand core production is to use a hot core box mold. The hot core box mold is driven by a hydraulic cylinder to drive the ...

AI Technical Summary

Problems solved by technology

Since the sand core has a thick section, the thickness of the sand core is between 300-400mm, and it is a solid body with a large modulus structure, the sand core is cured by heat when the coated sand is injected into the inner cavity of the heated hot core box mold through the airflow. At the same time, because the inside of the whole sand core is thick and there are many sands, the amount of heat conducted by the heating rod through the mold will be affected by the sand itself. Curing, due to the large thickness and slow heat transfer rate, the curing is relatively slow. Therefore, firstly, the coated sand after 5mm will be formed close to the inner cavity of the hot core box, that is, the outer surface of the sand core. At this time, the inner There is also a heat-softened fusion body, which slowly creeps and sinks under its own gravity. With the solidification of the softened fusion body, the sand core in the inner cavity of the hot core box will appear like Figure 11 The above-mentioned problem is that the film on the part in contact with the inner cavity is sandwiched on the top of the hot core box due to heating, and a gap structure lower than the designed shape is formed in the jacket. The jacket is very crisp and easy to remove. The sand core at the top of the hot core box shows a creeping part, which cannot reach the shape of the designed sand core, which has become a defect. Due to the occurrence of this situation, the normal production of the company is seriously affected. How can the sand core be reduced? This defect has become a major technical issue for the company to overcome

Images