dc.description.abstract | This research is using friction drilling to get a hole, then using different fluids to cool the hole wall simultaneously. The friction drilling processes are using a high speed rotating conical tool to penetrate a thin workpiece and create a bushing without generating chips. After completing the friction drilling processes, the material is still on high temperature, and then use different fluid to cool the hole wall simultaneously in order to get heat treatment results.
This research is using friction drilling to get a hole, the workpiece is AISI 304 stainless steel, and using different fluids to cool the hole wall simultaneously, including pure water, quenching oil, air, and nitrogen gas. Collocating the working parameter we necessary, and different cooling delay time experimenting with friction drilling. We observe the hole wall after the friction drilling, hole roundness, hole surface roughness, surface hardness, bushing length, and hardness layers depth in experiments. In order to get the better parameters of the hole drilling and surface quality.
The results of experimental show that cooling the hole whenever using pure water, quenching oil, air, and nitrogen gas, it can get the best surface roughness when the rotating speed is 3600 rpm. Although the results in air and nitrogen gas are having better effects in roughness and roundness, but their hardness layer depth and hardness aren’t better than pure water and quenching oil. After friction drilling using quenching oil cooling, the hole is better than the other three. When the cooling delay time is 0.2 second, the workpiece get a protecting no matter what surface hardness, hardness layer depth and hardness are having the eminent improvement. | en_US |