两种不同铸圈衬层厚度对铸件铸造精度的影响  

Effect of Two Different Ring Liner Thickness on the Precision of Castings

作　　者：王魏新[1] 巢永烈[1] 

机构地区：[1]四川大学华西口腔医院口腔修复科,四川成都610041

出　　处：《华西口腔医学杂志》2005年第1期21-23,共3页West China Journal of Stomatology

基　　金：四川省科技攻关计划资助项目(D101SG013_14)

摘　　要：目的　研究两种不同铸圈衬层厚度对铸件变形量的影响。方法　采用预制标记点的圆盘形蜡型,用同一 种铸圈(GCNo.2铸圈,内径39.5mm,高50mm)及包埋料,分别用0.70mm和0.45mm两种厚度的陶瓷纤维铸圈衬 层对蜡型进行包埋铸造,测量相应标记点方向上铸件与蜡型的线性变化率△L,研究铸圈不同方向上的膨胀特性及 不同的衬层厚度对铸造精度的影响。结果　铸圈内包埋料表现为各向异性膨胀,径向膨胀量大于轴向(P<0.01); 两种厚度的铸圈衬层对铸件变形量的影响不具有统计学意义(P>0.05)。结论　在本实验的研究条件下,所采用 的两种厚度的衬层材料尚不能消除铸件的不均匀变形现象。Objective To investigate the effect of two different ring liner thickness on the deformation of resulted castings.Methods GC No.2 casting rings (50 mm in height and 39.5 mm in diameter) were lined with two dry ceramic fiber liners with thickness of 0.70 mm and 0.45 mm. Plate-like wax patterns with pre-marked points were invested with a gypsum-bonded investment and the rings were cast with a silver-based dental alloy. The difference between the castings and the wax patterns at corresponding points was calculated to represent the dimensional change of the investment in the rings at different directions.Results The expansion of the investment in the ring was non-isotropic, with larger radial direction expansion than the axial direction expansion(P<0.01). In the scope of this study, the effect of two different ring liner thickness on the casting precision was statistically non-significant (P>0.05).Conclusion The liners with two different thickness failed to eliminate non-isotropic deformation of the castings under the testing conditions of this study.

关 键 词：铸圈衬层 包埋料 铸造精度 

分 类 号：R783.2[医药卫生—口腔医学]