Study on the EMD Processing Method of Cylinder with Multiple Diagonal Slits
Aiming at complex shape of cylinder with multiple diagonal slits and difficult to processing using traditional processing method. the paper adopt two methods of EMD shaping and trajectory to processing slits of cylinder with multiple diagonal slits. Compared the processing quality of two processing method by the following aspects, such as the electrode material and fabrication technology, the level of difficulty with control of slits processing and Factors determine the accuracy of slits and so on. As can be seen from the comparison, for EDM forming method, processing electrode complex and inconvenient, but the process is simple relatively, have no use for complicated electrical control. For EDM trajectory method, processing electrode is simple and convenient, but the process is complicated relatively. It can process slits closer to the ideal shape through the establishment of a precise trajectory equation and using complicated electrical control.
One-dimensional longitudinal-torsional vibration converter with multiple diagonally slitted parts
For increasing the available vibration velocity of the one-dimensional longitudinal-torsional vibration converter, a new type of complex vibration converter with multiple slitted parts installed in the positions avoiding longitudinal nodal positions along the converter for decreasing the maximum vibration stress level at the vibration nodal part was studied. The free end of the converter vibrates in an elliptical or circular locus. Complex vibration systems with elliptical to circular or rectangular to square loci can be applied effectively for various high-power applications, including ultrasonic welding of metal or plastics, ultrasonic wire bonding of IC, LSI and electronic devices, and also ultrasonic motors. The converter with multiple slitted parts was improved in the vibration stress level and the quality factor compared with the converter with single slitted part.
The Determination of Physicochemical Characteristics of Biodiesel and Its Blending Oils
The viscosity,combustion heat,sulfur content,carbon residue,ash,flash point,moisture and cetane value of biodiesel and its blending oils with diesel were determined.The influence of temperature on the viscosity was studied,and the physicochemical characteristics of biodiesel and its blending oils were compared with diesel.The results indicated that biodiesel and its blending oils had some superior performances and good application prospect.