17-4PH沉淀硬化不锈钢轧机导槽的精密铸造  

Production of 17-4PH Precipitation Hardening Stainless Steel Nozzle for Rolling Mill by Investment Casting

作　　者：赵竞翔[1] 陶小炯 李桐[1] 王拓[1] 

机构地区：[1]郑州机械研究所 [2]摩根轧机上海有限公司

出　　处：《特种铸造及有色合金》2012年第7期615-617,共3页Special Casting & Nonferrous Alloys

摘　　要：轧机导槽是高速线材轧机上的易损部件,采用17-4PH沉淀硬化不锈钢熔模铸造而成。该部件结构复杂、壁厚相差大,易产生缩孔、缩松缺陷;浇口处在热处理时易出现裂纹,制造工艺难度大。根据导槽零件的结构特点,优化模具设计、使用石蜡硬脂酸低温蜡制模,有效防止蜡模的变形,保证了铸件的尺寸精度和表面光洁度;通过浇注系统的优化,解决了导槽铸件的缩孔和热处理过程中的开裂缺陷,批量生产出了合格的导槽铸件。Nozzle for rolling mill as easily failure parts for high speed wire rod mill was produced with 17-4PH precipitation hardening stainless steel by investment casting.There exists many difficulties in the manufacturing process,and shrinkage porosity（hole） often occurs in the nozzle due to its complicated structure and obvious wall thickness difference.Meanwhile,crack can be easily generated at the runner location after heat treatment.Based on the structure characteristics of the nozzle parts,through optimizing mould design and making wax-pattern with paraffin-stearic acid low-point wax as well as silica sol shell molding,deformation can be effectively avoided,and dimension accuracy and surface roughness can be improved.The shrinkage porosity（hole） and thermal crack can be eliminated by optimizing gating system.Product-volumetric qualified castings were manufactured.

关 键 词：轧机导槽 17-4PH沉淀硬化不锈钢 精密铸造 热处理工艺 

分 类 号：TG249.5[机械工程—精密仪器及机械]