Casting mold for a thin-walled impeller

Abstract

The invention discloses a casting mold for a thin-walled impeller. The casting mold comprises a mold body and mud chips. The mold body comprises a convex mold body and a concave mold body which are distributed in the left-right manner. A vertically-arranged mold cavity matched with the impeller in shape, a casting opening formed in the upper end face of the mold body, spures connected between the casting opening and the bottom of the mold cavity and dead heads formed in the upper end face of the mold body and communicating with the mold cavity are formed in the mold body. The mud chips are pressed between the convex mold body and the concave mold body and are vertically arranged. According to the casting mold for the thin-walled impeller, the mud chips are vertically arranged, and metal liquid flows into the mold cavity from the lower portion, so that the acting force of the metal liquid on the mud chips can be weakened, and the mud chips are not likely to creak during impeller forming; due to the shape design of runner portions and thermal insulation cavities, the progressive solidification of the impeller is facilitated while the thermal insulation function is achieved during impeller forming; and filtering screens in the runner portions can filter impurities in the metal liquid, and therefore the clean production function is played.

Description

technical field [0001] The invention relates to the field of casting, in particular to a casting mold of a thin-walled impeller. Background technique [0002] Sand casting needs to put the finished part model in the sand, then fill the sand around the finished part model, and then take out the pattern after opening the box to form the mold. [0003] When casting a closed impeller in the prior art, the blades of the impeller are located between two closed pieces. In order to facilitate casting, the split mold in sand casting is generally used, and a mud chip for forming the blade is pressed between the concave mold and the convex mold of the mold. At the same time, in order to form a compact casting, the inlet of the runner needs to be set at the bottom of the mold cavity, so that the molten metal slowly overflows into the mold cavity through the inlet of the runner and rises. Molds for casting impellers such as figure 1 As shown, it includes a mold body 1 , a casting port...

AI Technical Summary

Problems solved by technology

[0004] However, when casting the impeller in the above way, if the radius of the blade is too large, the radius of the corresponding mud chip is also large, so that when the molten metal enters the mold cavity, the contact area between the molten metal and the mud chip is relatively large. , at this time, the buoyancy of the metal liquid to the mud chip is relatively large, which easily causes the mud chip to break due to the large buoyancy; if the thickness of the blade is small, the thickness of the corresponding mud chip is also small, making the structural strength of the mud chip Relatively poor, when the metal liquid exerts buoyancy on the mud chip, it is also easy to cause the mud chip to break due to buoyancy, and eventually lead to the scrapping of the impeller. Although the structural strength of the mud chip can be improved by increasing the resin content in the mud chip, but The increase of resin content also improves the gas generation of the clay chip, which easily leads to the occurrence of pores in the casting

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