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Turbine blade investment casting shell and casting process thereof

A technology of investment casting and turbine blades, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problem that there is no good solution for cracks on the R-shaped shell at the exhaust side, the gas discharge of the shell is not obvious, and the wax pattern is repaired Time increase and other problems, to achieve the effect of reducing production time, reducing large thickness differences, and reducing production costs

Active Publication Date: 2022-03-22
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following problems: when the wax pattern structure of the wax discharge vent is welded to the thin-walled structure of the part wax pattern, it is difficult to operate, which easily causes the deformation of the part wax pattern, and leads to an increase in the wax pattern repair time, low production efficiency, and low production efficiency. poor consistency
The existing technology complicates the structure of the module, and the exhaust of the gas in the shell is not significant
And for blades with large changes in blade size, there is still no good solution for the shell cracks at the exhaust edge R

Method used

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  • Turbine blade investment casting shell and casting process thereof
  • Turbine blade investment casting shell and casting process thereof
  • Turbine blade investment casting shell and casting process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation process for a turbine blade investment casting mold shell, comprising the following steps:

[0046] S1: According to the casting and module structure, design the size and quantity of wax vents. When the mold shell is dewaxing, the wax will melt and gasify when it encounters high temperature, and the thinnest part of the mold shell of the module will melt and gasify the fastest. If the liquid or gas cannot be discharged in time, the mold shell will be cracked and formed. Microcracks and even cracks can be seen visually. Therefore, the wax discharge vent should be set within the range of 0-15mm from the exhaust edge. The exhaust edge is the thinnest part of the casting and is the easiest to crack. More preferably, when the casting has a machining allowance, the wax discharge vent is arranged at the position with the machining allowance, and when the ingate of the module is consistent with the size of the casting, the wax discharge vent is arranged on the in...

Embodiment 2

[0057] Such as figure 1 As shown, this embodiment takes an aircraft guide vane as an example, the blade is about 200mm long, the chord width is 80mm, and the exhaust edge R1 ~ 1.5mm, the shell is manufactured by the following method:

[0058] (1) Design the wax mold structure of the wax discharge vent and the sticking position in the module.

[0059] When the mold shell is dewaxing, the wax will melt and gasify when it encounters high temperature, and the thinnest part of the mold shell of the module will melt and vaporize the fastest. If the liquid or gas cannot be discharged in time, the mold shell will be cracked and formed. Microcracks and even cracks can be seen visually. The size of the inner gate of the module is the same as that of the blade, and the wax discharge vent can be set on the inner gate. The wax discharge vent and the ingate are connected smoothly, and the connection is R1~2mm.

[0060] (2) According to the designed wax discharge vent structure, the diame...

Embodiment 3

[0073] Such as figure 2 As shown, this embodiment takes the third-stage turbine blade of a gas turbine as an example. The blade is about 260mm long, the chord width is 75-85mm, and the maximum thickness is about 13mm. Gas edge R1 ~ 1.5mm, the manufacturing method of the shell is carried out according to the following steps:

[0074] (1) Design the wax mold structure of the wax discharge vent and the sticking position in the module.

[0075] When the mold shell is dewaxing, the wax will melt and gasify when it encounters high temperature, and the thinnest part of the mold shell of the module will melt and vaporize the fastest. If the liquid or gas cannot be discharged in time, the mold shell will be cracked and formed. Microcracks and even cracks can be seen visually. Therefore, the wax discharge vent should be set within the range of 0-15mm at the thinnest part size, and generally set at the part with machining allowance. The size of the wax discharge vent can be determine...

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Abstract

The invention discloses a turbine blade investment casting shell and a casting process thereof, and the process comprises the following steps: according to a casting and a module structure, designing the size and the number of dewaxing air vents, and arranging a processing space of the dewaxing air vents in an inner cavity of a wax mold of the casting and at a position 0-15mm away from an exhaust edge; then a casting module is obtained through wax injection, pressure maintaining, cleaning and combining, and casting module shell manufacturing is conducted; grinding a dewaxing air vent; and the obtained casting module is dewaxed, roasted and repaired, the shell is shaken, washed and sealed, and the shell is obtained. The method is simple and easy to implement, batch production is facilitated, the wax mold manufacturing time can be shortened, the shell quality is ensured, the production cost is reduced, the production efficiency is improved, and the obtained shell is good in consistency and high in percent of pass.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and relates to a turbine blade investment casting mold shell and a casting process thereof. Background technique [0002] Turbine blades are one of the important components of gas turbines. Generally, they are integrally formed by high-temperature alloy investment casting method, which is extremely difficult to cast. Because the size of the blade itself is relatively complex, the blade length is about 200-300mm, the chord width is 75-85mm, and the maximum thickness of the blade shape is about 13mm. Exhaust side R1 ~ 1.5mm, air inlet and exhaust thickness difference is large, when the shell is dewaxing, the wax will melt and gasify at high temperature, and the thinnest part of the mold shell melts and gasifies the fastest , if the liquid or gas cannot be discharged in time, the shell will be cracked, forming microcracks or even visually visible cracks. At present, during the process de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22
CPCB22C9/04B22C9/22
Inventor 牛建平尹冬梅许言成娟汪国峰王琳潘锐穆森
Owner AECC AVIATION POWER CO LTD