Research on Casting Technology of Ductile Iron Large Wheel Hub for 125 Tons Mining Trucks
Author of the article:QIN Pengpeng;TANG Sen;XIE Wenbo;LIU Yang;LI Jian
Author's Workplace：Zhumadian CIMC Huajun Foundry Co.,Ltd.,Zhumadian 463000,China
Key Words：mining vehicle wheel hub casting defects foundry technology
Abstract：The load weight of the mining truck is 125 tons,its wheel hub size is larger,the wall thickness of wheel hub is thicker,the flange diameter is 2 times of the general heavy truck,the weight is 82 kg.In the actual design and development,there are some problems such as low yield strength of the wheel hub,shrinkage porosity and cavity defects in the hot spot,and floating of metallographic graphite in the thick part.Combined with the characteristics of the wheel hub,the process was optimized by increasing the yield strength by adding Cu element,reducing the carbon equivalent and the pouring temperature to eliminate the graphite floating,and reducing the feeding distance by using self-made easy inserts to reduce and eliminate the defect tendency of shrinkage cavity inside the wheel hub.The results show that the batch production of wheel hub is finally realized after the process optimization.The casting process of the wheel hub differs greatly from that of ordinary commercial vehicles,so the material and process parameters need to be optimized and adjusted.Improving the feeding efficiency of riser is the key to improve the internal quality of the wheel.Reasonable feeding process can not only improve the product quality,but also improve the production rate and reduce the production cost.
