Composite casting system of crank shaft box

Abstract

The invention discloses a composite casting system of a crank shaft box. The composite casting system comprises a base plate core, a jacket core, a main core, an end face core, an outer cast core and a pouring system. The base plate core, the jacket core, the main core and the pouring system are sequentially overlapped from the bottom layer to the high layer to form a crank shaft box sand mould structure. The pouring system comprises two rows of pouring openings evenly arranged and gates located outside the two rows of pouring openings. The two rows of pouring openings are communicated with a pouring opening cup through a flow division pouring gate and a pouring gate cup. The gates comprise hole-shaped gates located at four corners and strip gates located between the hole-shaped gates and outside the two rows of pouring gates. The composite casting system adopts a rain type pouring system in the middle of a cast piece to conduct liquid feeding pouring from a plurality of positions of a shaft seat and reduces impact of pouring to casts, floating impurities cannot be easily adhered to the cast wall or the cast core, and the pouring system is good in slag blocking effect. The main core is arranged on the upper portion of a sand mould and on the shaft seat, and the two strip gates and the four hole-shaped gates are utilized to discharge air completely. The composite casting system does not require core drying and is stable in cast piece pouring.

Description

technical field [0001] The invention belongs to the field of mechanical design and manufacture, in particular to the technical field of mechanical casting, and in particular to a composite casting structure of a crankcase. Background technique [0002] In the production process of resin sand casting, a large number of pores are often produced in the casting due to the excessive gas generation of the sand core. At present, in the production of the crankcase body, in order to make the casting stable, a bottom pouring casting system is adopted, the water jacket core is set on the upper part of the sand mold, and the main core is set on the lower part of the sand mold; because the upward exhaust effect of the water jacket core is not good, it is necessary to Before casting, assemble the main core, water jacket core, oil channel core and other sand cores and send them to the drying room to dry the cores, that is, raise the temperature of the sand cores to 200-240°C, then keep the...

AI Technical Summary

Problems solved by technology

However, this method of drying core consumes a lot of energy, and the production cycle is long and the production efficiency is low.

[0003] In addition, the production of the crankcase body adopts the bottom pouring pouring system, which has a great impact on the mold during pouring, and sand washing is easy to occur during pouring, and the slag retaining effect is unstable, which cannot meet the casting needs

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