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根据控制杆的结构,对控制杆铸钢件的铸造工艺方案进行设计,再运用View Cast模拟软件对控制杆的铸造工艺进行数值模拟。模拟结果表明,在热节部位容易出现缩孔、缩松。设计冷铁数量及尺寸,在热节部位放置冷铁,同时重新设计冒口尺寸及数量,并且改为保温冒口。工艺优化后模拟结果显示,铸件大块的缩孔、缩松得到有效地消除,不仅能满足铸造需求,同时还提高了工艺出品率。对铸件进行900~920℃正火+580~600℃回火处理,测得其抗拉强度为815 MPa,硬度(HBW)为285,满足生产需要。
According to the structure of the control rod, the casting process of the control rod casting steel is designed, and then the casting simulation of the control rod is simulated by View Cast simulation software. The simulation results show that shrinkage and shrinkage easily occur in the hot section. Design the quantity and size of chilled iron, put chilled iron on the hot section, re-design the size and quantity of the feeder, and change to the feeder. Simulation results show that the process of optimization, shrinkage shrinkage of large pieces of castings are effectively eliminated, not only to meet the casting needs, but also improve the production rate of the craft. The castings were tempered at 900-920 ℃ and tempered at 580-600 ℃. The tensile strength was 815 MPa and the hardness (HBW) was 285, which met the production needs.