Casting die capable of achieving good forming

Abstract

The invention discloses a casting die capable of achieving good forming. The casting die comprises an upper die body (1) and a lower die body (2) which are both made of furan resin self-hardening sand, and the upper die body (1) is connected with the lower die body (2) through studs (11); the upper surface of the lower die body (2) is provided with a cavity matched with the shape of an impeller, multiple chilling blocks (21) are inlaid into the cavity, and the positions of the chilling blocks (21) correspond to the far ends of blades (31); and a main flow channel (13) is arranged in the upperdie body (1), the upper end of the main flow channel (13) is located on the upper surface of the upper die body (1), the lower end of the main flow channel (13) extends into the lower die body (2) andis connected with multiple branch flow channels (14) distributed in the circumferential direction, the end of each branch flow channel (14) is provided with a pouring gate (15), and the positions ofthe pouring gates (15) correspond to the inner wall of a shaft sleeve (32). The casting die capable of achieving good forming has the advantages of being high in casting qualification rate, low in machining cost and material cost and high in energy conversion efficiency and manufacture speed.

Description

technical field [0001] The invention belongs to the field of casting molds for cast iron impellers, in particular to a well-shaped casting mold. Background technique [0002] Large-scale cast iron impellers (referred to as impellers), such as water turbine impellers, include a turntable and multiple blades. The blades are distributed circumferentially on the turntable, and the blades have high dimensional accuracy. The gate location corresponds to the turntable. When pouring, the molten iron fills the turntable first, then the shaft sleeve, and finally the blades. During the casting process, due to the long and thin blades, it is difficult to empty the air in the cavity corresponding to the blades when the molten iron is poured, the molten iron is not completely filled, the blades are not formed completely, and the casting pass rate of the impeller is low. After the pouring is completed, The molten iron at the blade is the first to solidify, and the specific part of the bl...

AI Technical Summary

Problems solved by technology

Therefore, the impellers cast by existing casting molds have the defects of low casting pass rate, high processing cost and long manufacturing time, or have the defects of low casting pass rate, high material cost, low energy conversion efficiency and slow manufacturing speed

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