The Research Of Vibration Control Of BTA Deep-hole Drill Pipe Under MQL Conditions

Deep processing technology is one of important methods about high quality hole processing in machinery industry which holds important position in the manufacturing field such as national defense, aviation and automobile industry. During drilling, BTA deep hole drilling system drills depth within the workpiece. Thereby, the cutting fluid enters into the cutting position through the gap between the bull stick and the workpiece, then goes into the drill hole through the exhaust port, and finally discharges to the outside through the drain hole of the drill. With the development of green manufacturing technology, the questions about the quality, cost and the environment during the process attract people’s attention. MQL technology can reduce the cost effectively and be environmental protection, which takes advantage of a mixture of air and liquid to replace the traditional oil lubrication and cooling. As the ratio between the hole depth and the aperture ratio exceeds ten in the deep hole machining, so the long drill tools must be used that the drill vibration causes adverse effects to the course of working in MQL machining process. It plays an important role to research vibration and control strategy in MQL drill conditions for promoting the development of green manufacturing technology in the field of deep industry.This paper focuses vibration mechanism BTA deep hole drill under MQL conditions to make theoretical research and analysis, and do controlled study for the eccentric vibration of the drill pipe combined with GMA active control technology. Based on the solid-liquid coupling principles, the paper makes theoretical research about the vibration behavior of BTA drill system combining with the mechanical vibration and analyze the vibration principle of the drill pipe under MQL conditions and the traditional oil lubrication conditions. In order to control the vibration amplitude in the drill pipe under MQL conditions, a GMA active control method based on PID is put forward and a flexible GMA based on eccentric vibrating of the drill is designed. Then we do structure modeling for BTA drill subjected to the function of GMA and do simulation to the control by MATLAB. Finally, we conduct virtual experiment by ADAMS dynamic analysis software and MATLAB software to verify the effect of vibration control for drill pipe.This study provides a theoretical basis for the vibration behavior of the drill under MQL conditions and also offers a reference for eccentric vibration control of the drill.