Precision casting method for casting-channel-free rotational molding of automotive engine flywheel

Abstract

The invention relates to a precision casting method for casting-channel-free rotational molding of an automotive engine flywheel. The precision casting method comprises the following steps of: manufacturing a platform for rotational casting, and arranging rotary trays on the platform; adopting iron molds formed by combining upper mold shells with lower mold shells, and manufacturing molding cavities in the mold shells by adopting coated sand through a core shooting machine; mounting filter screens and sprue cups of direct casting at feeding ports of the upper mold shells; putting assembled molds on the rotary trays and circumferentially fixing; driving the rotary trays to drive the molds to rotate at the rotating speed of 35-60 r / min through an electric motor, injecting melted iron into the molding cavities of the molds from the sprue cups of direct casting by adopting a manner of top direct casting in the state of low-speed rotation, and forming target pieces in a manner that the melted iron naturally cools and solidifies in the state of low-speed rotation of the molds; and after the temperature of the surfaces of the molds drops, stopping rotating, taking off the molds, opening the molds, and taking out the target pieces. With the adoption of the precision casting method disclosed by the invention, the machining allowance of castings is reduced, the yield of finished products is increased, and the process problems and human factors affecting product quality in the casting industry can be effectively solved.

Description

technical field [0001] The invention relates to the field of metal gravity casting, in particular to a precision casting method for a runnerless rotary molding of an automobile engine flywheel. Background technique [0002] In the field of ferrous metal gravity casting, the current gravity casting method for casting disc-shaped solid castings such as automobile engine flywheels usually makes a sand mold cavity in a sand box according to the shape of the product, and pours molten metal into the cavity. This casting method must be provided with a sprue system and a feeding riser on the cavity before casting. Since the sprue and feeding riser are provided, after the casting is completed, the metal material left in the sprue and feeding riser accounts for about 15% to 30% of the product weight. If the product requires high surface accuracy, the proportion is still If it needs to be increased, the machining allowance of the casting product will be large, and the material waste w...

AI Technical Summary

Problems solved by technology

Since the sprue and feeding riser are provided, after the casting is completed, the metal material left in the sprue and feeding riser accounts for about 15% to 30% of the product weight. If the product requires high surface accuracy, the proportion is still If it needs to be increased, the machining allowance of the casting product will be large and the material waste will be serious; moreover, the qualified rate of precision products cast by this casting method is low.

Especially for casting precision products, the technical requirements for workers are very high, and the labor intensity is also high, which cannot be completed by ordinary workers.

For example, special precision casting equipment is used to cast precision, such as large steel mold casting, or lost foam casting, or investment casting, but these casting methods have problems such as large investment in molds and equipment, and cumbersome processes, which lead to increased production costs. Big

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