Method for improving finished product rate of evaporated pattern casting of holes and inner cavities

Abstract

The invention belongs to the field of evaporated pattern cast-iron manufacturing technology, in particular relates to an evaporated pattern casting process of anti-adhesive sand cast-iron and aims to provide a method for evaporated pattern casting of holes and inner cavities, which can lower the possibility of sand burning-on in the evaporated pattern casting and improve the finished product rate. According to the technical scheme, the method comprises the following steps: step I, sand core molding, namely manufacturing matched sand cores according to holes or inner cavities in foam models similar to a casting part in size and shape, wherein the holes or the inner cavities in the foam models are filled with the sand cores; step II, model cluster combination, namely placing the sand cores manufactured in the step I into the holes or the inner cavities of the foam models, and bonding the foam models to form a model cluster; step III, coating brushing; step IV, sand box pouring; and step V, cooling and then taking the casting part out. The casting process is mainly used for evaporated pattern casting of casting parts with slot holes, deep holes or inner cavities.

Description

technical field [0001] The invention discloses a method for improving the yield rate of lost foam casting of holes and inner cavities, which belongs to the technical field of lost foam cast iron manufacturing, and in particular relates to an anti-sticking sand cast iron lost foam casting process. Background technique [0002] Lost foam casting is to bond and combine 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 molding, and poured under negative pressure to vaporize the model. A new casting method in which metal occupies the position of the model, solidifies and cools to form a casting. [0003] Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable size; 3. High dimensional accuracy, smooth surface, reducing cleaning workload; 4. Internal ...

AI Technical Summary

Problems solved by technology

[0004] Although the lost foam casting process has been developed rapidly at present, the vibration of the model cluster with holes and inner cavities will not fill the holes or inner cavities with quartz sand. Generally, pre-filling sand in the holes and inner cavities is used, but due to Two factors: ①After the pre-filling operation is completed, it is easy to cause the phenomenon of unrealized sand filling; ②During the sand filling process, the coating is easy to be damaged and form sticky sand when the molten iron is poured. As a result, the sticky sand waste rate is still as high as 18%