Dimensional Accuracy Control of Ceramic Core Injection Molding for Hollow Blade

Gong Chengmeiqi; Wang Donghong; Wu Wenyun; Zhu Guoliang; Shu Da; Fu Chao

doi:10.15980/j.tzzz.2022.05.025

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Dimensional Accuracy Control of Ceramic Core Injection Molding for Hollow Blade
Vol. 42, Issue 5, Pages: 647-651(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.05.025

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Gong Chengmeiqi, Wang Donghong, Wu Wenyun, et al. Dimensional Accuracy Control of Ceramic Core Injection Molding for Hollow Blade. [J]. Special Casting & Nonferrous Alloys 42(5):647-651(2022)
DOI：

Gong Chengmeiqi, Wang Donghong, Wu Wenyun, et al. Dimensional Accuracy Control of Ceramic Core Injection Molding for Hollow Blade. [J]. Special Casting & Nonferrous Alloys 42(5):647-651(2022) DOI： 10.15980/j.tzzz.2022.05.025.

摘要

陶瓷型芯的尺寸精度直接影响空心叶片蜡模的壁厚。应用燃气轮机大尺寸单晶叶片陶瓷型芯注射成型数值模拟方法，预测了陶瓷型芯充填过程、体积收缩率与翘曲变形；基于试验设计，建立了注射参数与平均尺寸收缩率的数据模型。结果显示，各工艺参数对平均体积收缩率的影响顺序为：注射温度

保压压力

注射速率，最优注蜡工艺参数：保压压力为3.483 MPa

注射温度为139.84℃

注射速率为258.60 cm

陶瓷型芯尺寸精度达到CT3级。

Abstract

The dimensional accuracy of ceramic core directly affects the wall thickness of hollow blade wax mold. The numerical simulation method of ceramic core injection molding for large-scale single crystal blade of gas turbine was conducted

and the filling process

volume shrinkage and warpage deformation were predicted. The data model of injection parameters and average volume shrinkage was established based on the experimental design. The results indicate that the influence order of each process parameter on the average volume shrinkage presents as follows: injection temperature > holding pressure > injection rate. The optimal wax injection process parameters are holding pressure of 3.483 MPa

injection temperature of 139.84 ℃

and injection rate of 258.60 cm~3/s

so the dimensional accuracy of ceramic core reaches CT3 level.