# Effect of mold geometric error and surface morphology on vibration performance in centrifugal casting

(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 roughness of the roller and the mold. First, the actual surface profile of the roller and the mold surface is described by mathematical equation, and then the calculation method of the actual contact point coordinates between the roller and the mold is given. According to the actual contact point coordinates, the exciting force of the supporting roller on the mold rotor is obtained, and then combined with the transfer matrix method The calculation method of mold vibration performance was established, which can consider the geometric error and surface roughness of roller and mold surface.

(2) The effects of geometric errors and surface roughness of roller and mold on the vibration performance of the rotor were studied by an example. When studying the influence of surface geometric error, the vibration response of the rotor without considering the geometric error of roller and mold surface and considering the geometric error of roller and mold surface are calculated respectively, and the amplitude frequency response curves and vibration mode curves under various conditions are obtained. The results show that the surface geometric error of the roller and the mold has a great influence on the vibration performance of the rotor: after considering the outer circle shape error of the roller and the mold, the number of resonance speeds in the amplitude frequency response curve increases; at the same speed, the outer circle shape error of the roller and the mold causes more vibration of the rotor than the unbalanced centrifugal force, which indicates that the surface geometric error of the roller and the mold causes more vibration of the rotor The influence of the error on the vibration of the cast rotor can not be ignored.

(3) In order to study the influence of surface roughness on the vibration performance of cast rotor, different roughness values are taken for calculation. The results show that the excitation force caused by roughness and the maximum amplitude of nodes increase approximately linearly with the increase of roughness; when the roughness is different, the rotation speed with larger amplitude in amplitude frequency response is basically the same; at the same rotation speed, the rotor at the same time increases The results show that the shape of the mold is similar, but the amplitude increases with the increase of the roughness.

Scroll to Top