Open type top shower gating system for air cylinder cover

Abstract

The invention discloses an open type top shower gating system for an air cylinder cover. The system comprises a sprue, at least one cross gate and at least one ingate, wherein one end of the cross gate communicates with the sprue while the other end of the cross gate communicates with the ingate; the sectional area ratio of the sprue to the cross gate to the ingate is that sigma F (sprue): sigma F (cross gate): sigma F (ingate)=1: (1.5-2.5): (2-3); a filter screen is arranged in the cross gate. With the adoption of the system, a produced casting is stable in quality, the rejection rate caused by cold shut, sand inclusion, slag inclusion and other defects can be greatly decreased, and moreover, the production cost can be decreased.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to an open top rain pouring system for a cylinder head. Background technique [0002] The cylinder head is one of the key parts of the medium-speed diesel engine. The material is RuT300. Its internal cavity structure is very complicated, and the design of the gating system is also extremely demanding. The gating system of the traditional technology of the cylinder head is as follows: figure 1 The closed top rain gating system shown includes sprue 1, runner 2 and ingate 3. The pouring time of this gating system is long, and the molten iron has a relatively low impact on the cavity and ingate sand mold. Large, easy to produce sand and slag inclusion defects, so the ingate is usually made of ceramic tubes to prevent the molten iron from scouring the runner. The production of each cylinder head requires 12 special ingate ceramic tubes, greatly The production cost of the cylinder head...

AI Technical Summary

Problems solved by technology

The gating system of the traditional technology of the cylinder head is as follows: figure 1 The closed top rain gating system shown includes sprue 1, runner 2 and ingate 3. The pouring time of this gating system is long, and the molten iron has a relatively low impact on the cavity and ingate sand mold. Large, easy to produce sand and slag inclusion defects, so the ingate is usually made of ceramic tubes to prevent the molten iron from scouring the runner. The production of each cylinder head requires 12 special ingate ceramic tubes, greatly The production cost of the cylinder head is greatly increased, and because the flow rate of the molten iron at the inner runner is too fast, the splash of the molten iron in the cavity is easy to produce iron beans and cold shuts in the casting, resulting in the leakage of the casting and scrapping

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