Research And Design Of B-axis Power Tool Rest For Turning-milling Compound Machining Center

In the fields of aerospace,ship power,medical equipment,the demand for processing of multi-bevels and complex space surfaces is increasing rapidly.Turning-milling compound processing technology plays an important role in the field of high-precision machining.Its configured B-axis power tool rest can effectively solve the problems of high accuracy product and complicated surface processing.Therefore,it is a great significance to study the B-axis power tool rest of turning-milling compound technology on the road of domestication.In this paper,starting from the basic principle of coordinate transformation of turning-milling compound machining center,researched and designed a new type of B-axis power tool rest based on the change of power tool rest position.The main research contents are as follows:Firstly,the paper study the interpolation method of the trajectory of the B-axis power tool rest and the coordinate transformation of the machine tool,and establishe the kinematics mathematical model by combining D-H method,further analyze the actual stress of the B-axis power tool rest and established the dynamic model,which provides a theoretical basis for the power tool rest design.Secondly,designe a new type structure of B-axis power tool rest which can realize the integrated design of lathe tool plate and milling swing arm.The number of tools that can be installed reaches 12 or more,and the B-axis rotates within 360°,it is complete the processing of multiple processes in one setup.The main technical indicators of the tool rest reached and partially surpass the domestic similar products.Thirdly,using the MATLAB software to simulate and analyze the motion trajectory of the power tool rest,the reasonable motion range of the power tool rest is determined from the cloud diagram.And combined with the ADAMS simulation analysis software completed the kinematics simulation analysis.The motion cloud diagram verified the posture and stability of the power tool rest during machining.Used the ANSYS workbench simulation software completed the B-axis simulation and optimization.In order to improve the dynamic characteristics of the machine tool,its need to reinforce the weak parts that appeared after analysis.Fourth,in order to improve the dynamic characteristics of the power tool rest,the characteristic parameters of the direct-drive head torque motor need to be analyzed.Use the Simulink simulation and analysis module in MATLAB to establish the simulation model for the torque motor in the starting process.The results verified that the relevant parameters of the AC torque motor conforme with the design requirements of the power tool rest.In order to analyze the influence of unstable load and variable damping for the electromechanical coupling vibration characteristics of the system,has studied the electromechanical coupling vibration characteristics of the power tool rest.Based on the mathematical model established,and completed the electromechanical coupling modeling of the power tool rest system,which can get the vibration is larger within 0.1 second.Thus,the instability of the load and the change of the damping can cause the unstable output of the torque motor.It laid the foundation for the study of the subsequent B-axis power tool rest.