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Accurate forming method for precise-casting turbine blade die cavity

A turbine blade and model technology, applied in the direction of casting molds, casting mold components, casting molding equipment, etc., can solve the problems of inaccurate design of mold cavity, low efficiency, long cycle, etc., to reduce design costs, high efficiency, and design short cycle effect

Inactive Publication Date: 2011-08-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0004] In order to overcome the deficiency that the prior art cannot accurately design the cavity of the mold, the present invention provides a method for designing the cavity of the precision casting mold based on numerical simulation, and the result can be directly used in the design of the cavity of the precision casting mold of the turbine blade, solving the problem The problems of long mold design cycle, low efficiency and low precision

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  • Accurate forming method for precise-casting turbine blade die cavity
  • Accurate forming method for precise-casting turbine blade die cavity
  • Accurate forming method for precise-casting turbine blade die cavity

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Embodiment Construction

[0026] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation methods and processes. But the scope of protection of the present invention is not limited to the following examples.

[0027] The design of the cavity of the shaping mold for producing a certain type of aviation turbine blade, the embodiment steps are as follows figure 1 Shown:

[0028] step 1

[0029] A certain type of turbine blade is used for numerical simulation, such as figure 2 shown. Its main parameters are blade body length 101mm, maximum chord length 59.21mm, maximum inscribed circle radius 5.67mm, leading edge radius 4.22mm, and trailing edge radius 1.27mm. The blade is made of the second generation single crystal superalloy DD6, and the mold shell is made of silica sand. According to casting feeding ...

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Abstract

The invention discloses an accurate forming method for a precise-casting turbine blade die cavity, which comprises the following steps: the casting system model of a turbine blade is designed according to the casting technique of the turbine blade and a casting test is implemented; a thermoelectric couple is adopted for measuring the actual temperatures of the front edge and back edge of the blade, a blade back and a blade cabin during casting and condensing processes, determining the heat exchange coefficients of an interface, implementing numerical simulation on the casting process, obtaining the deformation situations of turbine blade castings during the casting process, implementing numerical simulation on precise casting process after the anti-deformation treatment of the casting model, and finally whether a molded surface deviation value meets the precision requirements on the size tolerance of the castings or not is judged. The accurate forming method for a precise-casting turbine blade die cavity greatly improves the finished product rate of the turbine blade, and reduces the periods and times of die trial.

Description

technical field [0001] The invention relates to a shaping method of a mold cavity. Background technique [0002] Complex hollow turbine blades are the core technology of high thrust-to-weight ratio engines. This type of turbine blades is the key to the development of aero-engines due to their complex internal cooling structure, strict requirements on aerodynamic shape and blade wall thickness and dimensional accuracy, and harsh working conditions. At present, hollow turbine blades are generally precision cast with single crystal or directional crystal without margin. When the superalloy is injected into the mold shell, it will shrink and deform as the temperature decreases. The mold cavity used in investment casting must consider the compensation for the shrinkage deformation of the casting. Since the turbine blade is an ill-conditioned structure composed of a large number of free-form surfaces and a complex inner cavity, the shrinkage of the casting caused by uneven heat d...

Claims

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Application Information

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IPC IPC(8): G06F17/50B22C9/00B22C9/22
Inventor 卜昆张定华董一巍程云勇黄魁东窦杨青窦杨柳张现东刘金钢杨小宁袁帅傅蒋威周丽敏乔燕张亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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