Dynamic friction behaviors of the grease with nano-particles as additives in pneumatic cylinders

• Main Authors: Chou-Wei Lan, 藍冑偉
• Other Authors: 張合
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/4a998z

博士 === 國立臺北科技大學 === 機電科技研究所 === 100 === This study aims to build new friction force test equipment to measure and analyze the frictional force between seal and cylinder bore and dynamic friction characteristic of pneumatic cylinder with nano-lubricant. The dynamic characteristics of pneumatic cylinder are affected by guide seal, piston seal, grease and surface of cylinder bore. In seeking to improve the friction force characteristics of pneumatic cylinders and to clarify the friction phenomenon of the pneumatic cylinders, this study describes friction force measurement tests to measure the friction force of pneumatic cylinder, under both dry and lubricated conditions. Experimental equipments are designed to assess the effect of seals and lubrications in pneumatic cylinder, where the velocity and pressure of the driving cylinder are controlled. Measurements of friction force are shown for velocities of up to 200 mm/s. In this research, the first step, TiO2 and CuO nano-particles were chose to synthesize the nano-lubricants. Secord, a ball on flat test equipment was employed to measure the lubrication properties of Nano-lubricants. And the friction force measurement of pneumatic cylinder was used to measure the friction force of pneumatic cylinder with different seals in dry and lubricating condition. In these experiments, the best nano-lubricant and seal were chosen into analyze the friction characteristics of the grease with nano-particles as additives in pneumatic cylinder. The results appear that the friction force measurement system can effectively and precisely measure the friction force between seal and cylinder bore. And, in low velocity operate condition; the ball effect of the nano-particles can avoid the stick-slip motion of the piston. In the high velocity operate condition; the nano-particle can reduce the damp of the lubricant so that the friction force is not getting to increase. This study develops two equipments to measure and analyze the lubrication properties of the nano-lubricant and the dynamic characteristic of pneumatic cylinder with nano-lubricant. These equipments can help the researchers, engineers and designers to study any kind of lubricant and different setup of seals in the pneumatic cylinder.