Study On The Stability Of High-speed Deep-hole Drilling Machine

With the level of technology and industrial technology continues to develop, the deep-hole drilling technology has been widely applied in various sectors of machinery manufacturing. However, due to several key shortcomings such as high processing costs, low processing efficiency, low product quality, ordinary deep-hole drilling has been unable to satisfy the needs of modern machinery processing industry, the emergence of high-speed deep-hole processing machine up for the lack of deep-hole drilling machines in these three aspects. Therefore, make the stability of high-speed deep-hole drilling machine as the research object, this paper conducted the following study:Firstly, the paper introduces the principle of high-speed deep-hole drilling process and drills used in the process, to begin with the BTA deep hole drill cutting conditions for high-speed machining, do overall stress analysis for the drill, then the mathematical model in the high-speed deep-hole BTA drilling process forces were established, obtained relationship between bit whole axial force and torque, drill structure parameters and drilling process parameters, with workpiece’s high-speed deep-hole machining process as an example that material is45#steel, obtained the relationship between the axial force size, torque size and the rate of tool feed. Secondly, through the use of Rotating Rayleigh Beam theory, a dynamic model of the workpiece was established, the workpiece’s free vibration mode shapes function was obtained. The mathematical model of the workpiece’s vibration offset is obtained through a combination of analysis and calculation each other between the strain energy and the kinetic energy of the workpiece, and continue to summarize the impact of the workpiece stability arising from the aspect of location of the drill machining, tool feed rate and workpiece speed by prior analysis of examples. Finally, by using ANSYS software, and with the previous example as a basis for analysis of the drill pipe supporting position on the high-speed deep hole drilling process, then select the appropriate drill support position, and draw the first five natural frequencies of different processing depths below this support position, through calculated the corresponding modes. By screening out those frequencies and mode shapes which have a serious impact on the front end of the drill pipe offsets, to avoid resonance processes, improve drill stability during processing. This subject provides a theoretical reference value for further research on the high-speed stability of deep-hole processing machine.