A manufacturing process of lug alloy parts with lug holes

Abstract

The invention provides a manufacturing process of a convex lug alloy part with a convex lug hole. The manufacturing process comprises the following steps: manufacturing a wax mold of the convex lug alloy part with the convex lug hole by using wax, and manufacturing inner cold iron, wherein the material of the inner cold iron is the same as that of a casting and the size of the inner cold iron is the same as that of the convex lug hole in the wax mold; inserting the inner cold iron into the convex lug hole, thereby forming a mold set by the inner cold iron and the wax mold, and manufacturing a mold shell; after removing the wax of the mold shell, burying the inner cold iron in the mold shell; then pouring alloy liquid; after the casting is cooled, taking out the casting; and meanwhile, taking out the inner cold iron from the casting. When the alloy liquid is poured, the heat of the alloy liquid on a convex lug part is accumulated by using the thermal conductivity and the heat accumulation rate of the cold iron, the condensation and cooling of the convex lug part is accelerated and the convex lug part is firstly condensed, so that the defects of shrinkage cavities and looseness of the convex lug part are eliminated. Meanwhile, the use amount of alloys is reduced and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a manufacturing process of lug alloy parts with lug holes. Background technique [0002] Certain superalloy parts containing lugs have holes in the lugs (eg figure 1 and figure 2 shown), during production, the high-temperature alloy parts are first made by investment casting technology such as image 3 and Figure 4 In the structure shown, the lug is the thickest and largest part of the casting, which is a casting hot node. If the alloy liquid is not fed during the casting process, shrinkage cavities or loose defects will occur inside the lug. When machining the hole, Shrinkage cavity or porosity defects will be exposed; opening a riser at the lug for feeding can solve the problem of shrinkage cavity and porosity, but opening a riser will bring the following problems: [0003] 1. The pouring riser is set on the circumferential surface of the lug (such a...

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Problems solved by technology

[0003] 1. The pouring riser is set on the circumferential surface of the lug (such as Figure 5 As shown), when cleaning and removing the riser in the later stage, the shape of the circumferential surface cannot be completely guaranteed, causing the actual circumferential surface shape of the casting to be inconsistent with the drawing

[0004] 2. The pouring riser is set on the end face of the lug (deformation such as Image 6 As shown), under the action of the shrinkage stress of the riser, the lugs are deformed relative to the main body of the casting, resulting in unqualified casting size, which needs to be guaranteed by post-rectification; when the stress is too large, it will also cause crack defects in the casting

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