大型铸钢件的保温补贴工艺研究

发布时间：2018-07-10 03:27

本文选题：大型铸钢件 + 保温补贴　；参考：《铸造》2015年12期

【摘要】：保温补贴替代金属补贴在大型铸钢件上的应用还很少。本文对文献中的保温补贴替代金属补贴情况下确定保温补贴厚度的E-δ/M关系进行了修正,使得结果更准确。并指出保温补贴的模数增强最大效果为砂型和保温补贴的蓄热系数之比,超出此范围后,增厚保温补贴也不再满足保温要求。选择了大型厚板型试件1 200 mm×1 200 mm×180 mm,设计并优化了其保温补贴工艺方案,模拟结果发现由于保温补贴厚度小于金属补贴,因此必须对冒口下部因采用保温补贴而暴露给砂型的表面采用保温补贴保温,否则补缩通道在冒口颈部易产生缩颈。分别采用金属补贴和保温补贴两种工艺方案浇注了铸件。对浇注板件的探伤和解剖表明,铸件内部无缺陷。浇注结果和数值模拟结果均表明保温补贴可以替代金属补贴。但大型铸钢件要求保温补贴具有高的耐热性能,否则容易导致铸件变形。
[Abstract]:The application of heat preservation subsidy instead of metal subsidy in large steel castings is rare. In this paper, the E- 未 / M relation for determining the thickness of thermal insulation subsidy in the case of replacing metal subsidies in the literature is revised to make the results more accurate. It is pointed out that the maximum effect of modulus enhancement of heat preservation subsidy is the ratio of heat storage coefficient of sand mold and heat preservation subsidy, and beyond this range, the thickening heat preservation subsidy will no longer meet the requirements of heat preservation. In this paper, 1 200 mm 脳 1 200 mm 脳 180 mm thick plate specimen is selected, and its thermal insulation subsidy scheme is designed and optimized. The simulation results show that the thickness of heat preservation subsidy is less than that of metal subsidy. Therefore, the surface of sand mold exposed to the lower riser must be insulated by heat preservation subsidy, otherwise, the necking of the feeding channel is easy to occur in the riser neck. The castings were cast with metal subsidy and heat preservation subsidy respectively. The flaw detection and dissection of the castings show that there are no defects in the castings. The results of pouring and numerical simulation show that thermal insulation subsidies can replace metal subsidies. However, large steel castings require heat preservation subsidies with high heat resistance, otherwise, it can easily lead to casting deformation.
【作者单位】：清华大学材料学院教育部先进成形制造重点实验室;哈尔滨电机厂有限责任公司;
【基金】：国家重大专项创新平台建设项目——先进成形制造全流程建模与仿真创新平台(2012ZX04012011)
【分类号】：TG260

【相似文献】