基于脱蜡前存放温度调控的型壳脱蜡裂纹防治  

Crack Prevention for Ceramic Mould Based on Controlling Storage Temperature before Dewaxing

作　　者：李亚芳 孔小青 刘俊朋 李健[2] 王君武 贾敬惠 郑兴林 姚建省[3] Li Yafang;Kong Xiaoqing;Liu Junpeng;Li Jian;Wang Junwu;Jia Jinghui;Zheng Xinglin;Yao Jansheng(Guiyang AECC Power Precision Casting Co.,Ltd.;School of Materials Science and Engineering,Jiangsu University;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials.)

机构地区：[1]贵阳航发精密铸造有限公司,贵阳550000 [2]江苏大学材料科学与工程学院 [3]北京航空材料研究院先进高温结构材料重点实验室,北京100095

出　　处：《特种铸造及有色合金》2023年第9期1282-1286,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51775248)。

摘　　要：精密铸造过程中,型壳湿态强度不足时在脱蜡过程容易发生开裂从而引起浇注漏钢问题。提出通过控制脱蜡前型壳存放温度来实现脱蜡裂纹的防治,并对控制存放温度后的型壳脱蜡裂纹进行研究。结果表明,低于制壳温度的存放温度有利于控制型壳脱蜡裂纹发生,低存放温度使蜡模体积收缩,与型壳内腔形成一定的间隙,为后续的脱蜡过程提供蜡模膨胀裕度,降低其开裂倾向。脱蜡前采用温度低于制壳温度4 K的环境存放型壳,能有效防治脱蜡裂纹。The dewaxing crack commonly occurs in the pattern with low wet strength during investment casting,which subsequently leads to steel leakage.A strategy of preventing dewaxing crack was proposed based on controlling the storage temperature of pattern before dewaxing,and dewaxing crack of shell after controlling the storage temperature was investigated.The results indicate that the storage temperature below the shell-making temperature is beneficial to controlling the occurrence of dewaxing crack,and low storage temperature is helpful for the volume shrinkage of the wax pattern to form a certain gap between the wax pattern and the inner surface of the mould,providing expansion margin for the subsequent dewaxing process and thus reducing the cracking tendency.The dewaxing crack can be effectively prevented and controlled by using the storage environment with a temperature lower than 4 K,which is the shell-making temperature.

关 键 词：精密铸造 型壳 存放温度 脱蜡开裂 

分 类 号：TG249.5[机械工程—精密仪器及机械]