Cold wax block for controlling wall thickness of tenon teeth of hollow turbine working blade and casting method implemented by applying cold wax block

Abstract

The invention discloses a cold wax block for controlling the wall thickness of tenon teeth of a hollow turbine working blade and a casting method implemented by applying the cold wax block, and belongs to the technical field of precision casting. In the wax pressing process, the cold wax block with the precisely-designed shape is adopted to control the shrinkage amount of a wax mold. An upper moldblock and a lower mold block of the cold wax block can be buckled, a ceramic core is limited and protected, the problems that the ceramic core deviates and breaks due to wax material impacting in thewax pressing process of the ceramic core are avoided, and meanwhile the problem that the sizes of the thick and large parts of the tenon tooth wax mold are too small due to the large wax material shrinkage amount is solved. In order to further accurately position the core, an ejector pin of a shape mold is adopted to directly position the minimum wall thickness measurement part of the tenon teethof the core so as to ensure the relative position relationship between the core and the shape. By means of the method, the problem that the wall thicknesses of the tenon teeth are out of tolerance due to improper shrinkage control and/or core deviation in the working casting process of a hollow turbine can be effectively solved.

Description

technical field [0001] The invention discloses a cold wax block for controlling the wall thickness of tenon teeth of hollow turbine working blades and a casting method realized by using the same, belonging to the technical field of precision casting. Background technique [0002] Due to the outstanding advantages of sufficient material utilization and small circumferential dimensions, the fir tree-shaped tenon joint structure is widely used in the connection between the turbine rotor blades and turbine disks of modern aero-engines. The mortise and tooth parts of turbine working blades work under high temperature and high load conditions, not only to bear centrifugal load, vibration load, thermal load, but also to withstand corrosion and oxidation of environmental media. Due to its harsh working conditions, faults such as tenon tooth cracks, tenon tooth fractures, root extension fractures, and blade body fractures often occur. The maximum stress of the fir tree-shaped turbin...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the present invention: In order to solve the problem of out-of-tolerance wall thickness of the tenon teeth due to improper shrinkage control and / or core deviation during the casting process of the hollow turbine blade, the present invention provides a method for controlling the wall thickness of the tenon tooth of the hollow turbine blade. Cold wax block and casting method

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