Casting sand box

Abstract

The invention discloses a casting sand box comprising a sand box bottom, a sand box wall and an upper air exhaust lifting and pressing lever, wherein a sand box body consisting of the sand box bottom, the sand box wall and the upper air exhaust lifting and pressing lever is halfpace-shaped; the upper air exhaust lifting and pressing lever consists of transverse air levers and vertical air levers of an air duct, which are transversely and vertically arranged inside and are communicated with an upper air exhaust pipe; each transverse air lever comprises a main transverse air lever and a secondary transverse air lever; each secondary transverse air level is arranged at the outer side of the main transverse air lever; each vertical air lever comprises a main vertical air lever and secondary vertical air levers; and the secondary vertical air levers are uniformly arranged at the both sides of each main vertical air lever. The area at the upper part of the casting sand box provided by the invention is increased, so that the quantity of sands is increased; and when the sands are rammed, the gravity of the sands generates an inward horizontal component under the effect of the wall of the sand box, so that the sands are filled in a lateral hole of a casting, and the quantity of defective goods can be greatly reduced. The casting sand box provided by the invention has more uniform adsorption force on molding sands by upper air exhaust lifting and pressing lever, is conductive to improving the working efficiency, and can be used for greatly reducing the crush rate, and ensuring the product quality.

Description

technical field [0001] The invention relates to a dry sand casting sand box for vacuum lost foam casting. Background technique [0002] At present, dry sand solid mold casting technology (vacuum lost foam casting) has been widely used in the field of casting. However, in the process of vacuum lost foam casting, the filling of dry sand is the key to vacuum lost foam casting. If the vibration strength is not enough, or the filling is not solid, it is easy to cause the box to collapse during casting, and the cast parts will become waste products. In view of this situation, the sand box adopted in the vacuum lost foam casting molding method of large and complex castings disclosed by the Chinese patent No. 200910074893.3 basically solves the above-mentioned problems, but this sand box is a box of a cube or a cuboid , for some special-shaped castings, especially the special-shaped castings with lateral horizontal holes on the side of the casting, the dry sand in the side holes is...

AI Technical Summary

Problems solved by technology

However, the currently used upper suction lifting pressure bar is not particularly good for casting the upper surface of the casting, and the casting efficiency is not very high, which will inevitably increase the casting cost of a single piece. For the current market environment, improving Product quality and grade, improving efficiency and reducing costs are the general trend

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