Aiming at the quality problem of CFRP inner wall in CFRP/Ti laminated material assisted vibration drilling technology, acoustic emission (AE) signals different processing parameters during are collected. Analyze relationship between characteristics and roughness under number holes. The test results analysis show that other kept unchanged process, only one parameter is changed. When amplitude sp...

In high-speed machining, the maximum stable depth of cut at any spindle rotating frequency depends on the spindle-holder-tool dynamic stiffness as reflected at the tool’s free end. Because this dynamic stiffness can vary with rotating frequency, we have modeled the spindle dynamic response using a finite element-based rotordynamics approach. The spindle shaft is modeled using beam finite elemen...

Rotating machinery, including machining spindles, industrial turbomachinery, and aircraft gas turbine engines, are very commonly used in industry. One major problem faced by these machineries is the harmful, imbalance-induced vibration. Many methods have been developed to reduce this vibration: o!-line balancing methods [1], on-line active balancing methods using mass redistribution devices [2}...

The demand of ultra-precision micro-machine tools is growing day by due to exigent requirements miniaturized components. High accuracy, good dimensional precision and smooth surface finish are the major characteristics these machine tools. High-speed machining has been adopted increase productivity using high-speed spindles. However, tool vibration a issue in machining. Vibration significantly ...

The suppression of the regenerative chatter phenomenon in turning process via the variation of the frequency and amplitude of the spindle motor excitation is carried out in this research. A programmable inverter is employed for variable periodic excitation of the spindle motor. A set of turning experiments is designed and performed on a number of conical work pieces both in constant spindle spe...

Spindle cell neoplasms are defined as neoplasms that consist of spindle-shaped cells in the histopathology. Spindle cell neoplasms can affect the oral cavity. In the oral cavity, the origin of the spindle cell neoplasms may be traced to epithelial, mesenchymal and odontogenic components. This article aims to review the spindle cell neoplasms of the oral cavity with emphasis on histopathology. ...