No abstract

This study investigated the removal improvement of micro burrs of aluminum alloy materials using vibrated abrasive grinding machining. The image processing technology is used to examine and quantify the micro-hole burr profiles. The experimental results show that the micro burr was uniformly removed as the workpiece is fixture with vertical direction. In addition, the burr removal improvements are effectively influenced by the flowing velocity and the vibration energy of abrasive particles. The flowing velocities are dependent on the size and gravity of the abrasives and the vibration energy is determined by the material properties and the hardness of the abrasives.

This study aims to develop a polishing process improvement technology for deep micro-hole knockout hole wall with high aspect ratio, and discuss the optimal polishing parameter combination of abrasive jet machining method and micro-elastic abrasive particles for deep micro-hole knockout hole wall surface. A micro-elastic abrasive process technology was thus developed. The experimental results showed that the micro-elastic abrasive has better grinding effect on the surface roughness of knockout hole wall in length of 300 mm and in inside diameter of ψ2mm in the machining conditions of jet pressure 0.5MPa, volume mixing ratio 2:1 of abrasive particles to additive and vacuum attraction 70 cmHg. It was improved from 2.39 μm Ra (10.74 μm Rmax) to 0.08 μmRa (1.12 μm Rmax), proving the feasibility of micro-elastic abrasive. The surface was improved well, and the process time was shortened greatly.

Stroke patients might lose their action for limbs act conseq�ently. If th � y ha : e not been treated with independent rehabilitation or external force rehabilitation in the long run, hmb dysfunctIOn might be h � ppened to them. The purpose of this study is to develop a set of finger joints rehabilitation syst � m. An� mechamsm an� control technology are integrated in this rehabilitation device. With regards to the mecham � m design, to use of micro gear motor with the screw as the way of transmission and it is driven by using link mechamsm so as to act the fing � r plates. The flexion and extension of the finger can be done by the action of finger plates eventually. As for the mterface system, it uses the embedded systems. It is done by inputting oper � t . ing . condit�ons through a touch panel.. Moreover, to install the sensor of angle, displacement and pressure on the rehabIlItatIOn devIce so as to feed b � ck the slgn � l � to back to the embedded system for data recording in order to provide the needed rehabilitation informatIOn for � hyslclan � o . as to attest the performance of the rehabilitation as well. It can truly improve the performance of the entrre finger Jomt rehabilitation device system a lot.