金属型壁厚对铸件品质的影响  

Influence of Mold Wall Thickness in Metal Mould Casting on the Casting Quality

作　　者：于宁 陈志 杜德喜 董秀琦[2] 杨洋[3] 

机构地区：[1]中信戴卡股份有限公司 [2]沈阳理工大学材料科学与工程学院 [3]燕山大学里仁学院

出　　处：《特种铸造及有色合金》2015年第10期1080-1082,共3页Special Casting & Nonferrous Alloys

基　　金：河北省秦皇岛市科学技术研究与发展计划项目(201502A012)

摘　　要：运用传热学原理计算得出金属型的壁厚与铸件的厚度成正比,与金属液的凝固温度和金属型预热温度的差成反比。金属型壁厚越大,其热容量越大,浇注时靠自身的热容来给金属液降温的能力越强,但其导热热阻大。当型壁厚度超过经济壁厚时,金属型外的冷却方式对铸件的影响较小,因而冷却效果较差。金属型壁厚大,则周向热阻小,因而保温作用较好,只适用于同时凝固。金属型壁薄则与上述情况相反。Reasonable wall thickness is proportional to the thickness of the casting,and inversely proportional to the difference between solidification temperature of liquid metal and preheating temperature of metal mould by transferring heating calculation.The larger the wall thickness of metal mould is,the larger its thermal capacity is.So the capability that decreases the temperature of molten metal through its own thermal capacity is the stronger.However,it is difficult for the metal mould to cool molten metal by using cooling media owing to the larger thermal resistance of the metal mould.When the wall thickness exceeds the reasonable wall thickness of the metal mould,effects of cooling methods on castings are slight,so the cooling effect is poor.The thermal resistance on circular direction for metal mould is low for the larger thickness of the metal mould,and effect of the mean temperature distribution of the metal mould is strong.It is suitable for simultaneous solidification.The metal mould with thin wall is contrary to the above results.

关 键 词：金属型铸造 模具壁厚 铸件质量 

分 类 号：TG249.3[金属学及工艺—铸造]