Wax mold of pouring system for large-scale hollow crowned blade casting and its manufacturing method

Abstract

The invention provides a wax mold of a large-size hollow shrouded blade casting pouring system and a manufacturing method of the wax mold. The wax mold comprises a casting wax mold and a runner wax mold; a core is arranged in the casting wax mold; a shroud inner gate is formed in the top of the casting wax mold, while a tenon inner gate is formed in the bottom of the casting wax mold; the runner wax mold comprises a first spherical riser of which the bottom is bonded to the top of the shroud inner gate and the top is connected to one end of a first horizontal runner; the other end of the first horizontal runner is connected to a straight runner; the top of the straight runner is bonded to a gate cup, while the bottom of the straight runner is connected to a second spherical riser; the second spherical riser is bonded to the tenon inner gate; the second spherical riser is connected to one end of a second horizontal runner, and the other end of the second horizontal runner is connected to the casting wax mold. According to the wax mold of the large-size hollow shrouded blade casting pouring system, the spherical risers and the corresponding runners are designed reasonably, such that smooth filling and effective feeding to a casting can be realized and the stress can be reduced; hence, the wax mold is applicable to produce large-size, hollow shrouded and complex-structure blades; the pouring difficulty can be reduced, such defects as core breakage, looseness and cracks of the casting can be avoided, and the product qualification rate can be increased.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a wax mold for a pouring system of a large-size hollow shrouded vane casting and a manufacturing method thereof. Background technique [0002] Gas turbine power turbine blades are mostly large-sized blades, among which there are many high-temperature alloy turbine working blades, which are crowned, hollow, complex in structure, and technically difficult. The manufacturing of large-sized blades usually adopts the method of investment casting, and the casting wax is first pressed. mold, and set ingates above and below the wax mold of the casting, the sprue cup is set on the top of the sprue, one side of the sprue is connected to the sprue respectively connected to the ingate, when pouring molten steel Molten steel flows into the casting shell along the runner to form blades. However, due to reasons such as feeding shrinkage or unreasonable filling, the castings produced ...

AI Technical Summary

Problems solved by technology

[0002] Gas turbine power turbine blades are mostly large-sized blades, among which there are many high-temperature alloy turbine working blades, which are crowned, hollow, complex in structure, and technically difficult. The manufacturing of large-sized blades usually adopts the method of investment casting, and the casting wax is first pressed. mold, and set ingates above and below the wax mold of the casting, the sprue cup is set on the top of the sprue, one side of the sprue is connected to the sprue respectively connected to the ingate, when pouring molten steel Molten steel flows into the casting shell along the runner to form blades. However, due to reasons such as feeding shrinkage or unreasonable filling, the castings produced will have defects such as broken core, looseness, cracks, etc., resulting in a high rejection rate and a low pass rate. And due to the large size of the blade, pouring is difficult

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