Papers by Keyword: Machine Element

Abstract: In this study, the authors employ a multi-point die-support structure to hold the punch plate of a stamping die in order to intercept useless force from the slide of a press machine. The developed multi-point support structure has 12 support cells (support units) between the punch plate and the slide of the press machine; the cells are metal cylinders working as springs. The support unit has a ball contact at the interface of the punch plate, and the interface freely for rotates and slides horizontally. The support unit has strain gauges on the side surface, and we can determine the bearing load at each unit, as well as elastic deformation. We can observe the bearing load distribution and then relocate the support units to better distribute the supporting points. The authors discuss the relocation of support units and demonstrate the efficiency of the proposed structure for reducing the jolt of a stamping die set. The range of jolt between the punch plate and the die plate of the experimental die is 0.711mm with normal support for piercing a 30mm-diameter hole on a 1.2mm-thick JSC980Y sheet. However, it is 0.355mm with the proposed die-support structure after several relocations of the support units.

Abstract: Nanoscience and nanotechnology is one of the most important researches in the 21st century. This paper took the application of nanotechnology for mechanical manufacturing as a point of departure, discussed the nano-material technology, nano-processing technology, nano-assembly technology and nano-measurement technology in mechanical manufacturing, and described the resulting theory nano-mechanics which was different from the traditional mechanics. Moreover the important role of nano-technology for the development of mechanical manufacturing was pointed out at the end of the paper.

Abstract: The bolts and nuts are widely used in various fields as important joining elements with long history. However, loosening induced by the vibration and external loads is still a big problem. And the loosening sometimes causes very serious accident without notice. This paper deals with a special stud bolt named “Super Stud Bolt (SSB)” which can prevent loosening effectively. There is a thin walled tube between the upper and lower threads, which can be deformed along the axial direction so that the phase difference is produced and SSB is developed. This phase difference induces the contrary force on the surfaces of the upper and lower threads, which brings out the anti-loosening performance. In this study, the processing and fastening-loosening courses are simulated with the finite element method. And the anti-loosening performance is analyzed and realized. In addition, the anti-loosening performances under various phase differences are compared and finally best dimensions for SSB are examined.