Casting method of valve cover casting

Abstract

The invention discloses a casting method of a valve cover casting. The method concretely comprises the following steps: 1, designing a technology and dies according to a proportional solidification technology, and making a lower type die, an upper type die and a cast die; 2, shooting on corresponding hot core box shooters to make a lower type sand core, an upper type sand core and a cast sand core; and 3, trimming and assembling the above sand cores, tightly clamping the assembled sand cores with a clamp, and carrying out cast molding to obtain the valve core casting. The valve cover casting has a high coated die sand mold surface hardness, can fully perform the graphitization expansion in nodular cast iron to carry out self-feeding, and adopts hot side casting of a cast gate, and the cast gate which is short, thin and wide can fully perform its self-adaptive adjustment effect; the shrinkage porosity and shrinkage cavity defects are thoroughly eliminated, the cast gate which is thin has a good slag baffling effect, defects comprising slag blowholes and the like are basically eliminated, and the casting yield is above 95%; and cold iron is thoroughly removed, the operation is simple, and the production efficiency is improved to a great extent.

Description

technical field [0001] The invention relates to a casting process method, in particular to a casting process method of a valve cover casting. Background technique [0002] The gating system of the original process is formulated according to the general simultaneous solidification principle, such as figure 1 As shown, the cold iron 3 and the feeding of the gating system must be used to basically ensure that there is no shrinkage cavity and shrinkage defect after the surface processing of the hot joint part. Since this product uses shell casting, the shell is shot on the hot core box core shooter. System, and the batch is large, the use of a large amount of chilled iron not only affects the production schedule, but also chilled iron needs to be processed and painted. Cold iron will not only fail after being used for several times, but also produce defects such as air holes and slag holes due to uneven coating and moisture absorption, which is not suitable for mass production....

AI Technical Summary

Problems solved by technology

[0002] The gating system of the original process is formulated according to the general simultaneous solidification principle, such as figure 1 As shown, the cold iron 3 and the feeding of the pouring system must be used to basically ensure that there is no shrinkage cavity and shrinkage defect after the surface processing of the hot section part. Since this product uses shell casting, the shell is shot on the hot core box core shooter. system, and the batch is large, the use of a large amount of chilled iron not only affects the production schedule, but also the chilled iron needs to be processed, paint

The cold iron will not only fail after being used several times, but also produce defects such as air holes and slag holes due to uneven coating and moisture absorption, which is not suitable for mass production. It is difficult to achieve a yield of about 80% under normal production conditions.

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