In addition to Si, Mn and C elements, a certain amount of Cu is added to nodular cast iron. Cu can stabilize austenite, promote the formation of bainite and refine the acicular structure of bainite to a certain extent. Cu can also improve the austenitizing speed of Austempered Ductile...
1. Test materials Figure 1 shows the wear of excavator bushing. It can be found that the bushing has been worn through and there is no obvious wear at the mounting hole, which benefits from the protective effect of the bushing. The shaft was partially worn after one month...
Since the emergence of centrifugal casting technology, many scholars at home and abroad have studied the centrifugal casting process. At present, most of the research on centrifugal casting process is carried out by CFD software, but when centrifugal casting is used to produce industrial cracking furnace tubes, because the...
(1) Taking the force of roller supported horizontal centrifugal casting machine as the research object, the calculation method of the comprehensive stiffness and damping of the foundation and the foundation when the rectangular foundation acts on the elastic half space foundation is established. Then the force analysis of the...
(1) In horizontal centrifugal casting with roller support, the shape error and surface morphology of the two relative moving contact surfaces of the roller and the mold will cause certain vibration of the mold rotor. In view of this point, this chapter considers the surface shape error and surface...
Taking the horizontal centrifugal casting machine for furnace tube supported by roller as the research object, the dynamic performance of the machine and the influence of various factors on its dynamic performance were systematically studied, including the influence of mold centroid distribution, the influence of roller and mold cylindrical...
In the past 30 years, scholars at home and abroad have used the finite element method to analyze the rotor dynamics of various rotor systems, and solved many practical problems. Kahraman et al. Established a finite element model of gear rotor system supported by flexible bearing, in which the...
Compared with the transfer matrix method, the main characteristic of the finite element method is that the expression is concise and standard. It has outstanding advantages in solving the problem of complex mechanical system composed of rotor and surrounding structure. However, when the model is too complex, this method...
In the 1980s, Huang Taiping, Gu jialiu and others successively proposed some improved transfer matrix methods for relatively complex rotor systems. The more common methods are transfer matrix impedance coupling method, transfer matrix mode synthesis method and transfer matrix direct integration method. The transfer matrix impedance coupling method is...
The basic idea of transfer matrix method is to divide the whole structure into several mechanical problems of docking and transfer of sub elements, establish the transfer matrix between the two ends of the element, and use matrix multiplication to analyze the static and dynamic characteristics of the structure...