论文部分内容阅读
随着大型核电低压转子锻件尺寸和重量的增加,低压转子锻件锻透成为锻造过程的突出难题。该文通过改变砧形,采用凹型角度砧拔长的工艺来增加心部压实效果,并通过数值模拟和物理模拟相结合的方法对其应力应变的分布进行了研究。模拟结果表明:采用凹型角度砧拔长,增加了心部变形效果,改善了心部的应力状态,有利于心部压实和缺陷锻合;采用6°的凹型角度砧比平砧可以得到更好的应力应变状态。建议在大型锻件主拔长的前几趟次采用凹型角度砧拔长工艺。
With the increase of the size and weight of forgings of low-pressure rotors in large nuclear power plants, forging of low-pressure rotors becomes an outstanding problem in the forging process. In this paper, the heart compaction effect is increased by changing the anvil shape and adopting the concave-angle anvil-length drawing process. The stress-strain distribution is studied by the combination of numerical simulation and physical simulation. The simulation results show that: the use of concave angle anvil drawing increases the deformation of the heart, improve the stress state of the heart, which is conducive to heart compaction and defect forging; using 6 ° concave angle anvil than the anvil can be more Good stress-strain state. It is recommended in the main forgings of large forgings long several times using concave angle anvil drawing process.