System Design For Auxiliary Support Of Non-circular Cross Section Rotating Machining

With the weak rigidity workpiece machining, machining force will cause deflectionof the workpiece to be machined, so that the machining accuracy and surface roughnessare affected. In order to increase the rigidity of the workpiece during processing, theauxiliary support device was proposed. With the background of the research in windturbine blade placement machine, aiming at the characteristics of poor rigidity, radial sizeis far greater than axial size and non-circular. A novel auxiliary support device applied tonon-circular rotary machining was designed.First，a support device for the middle of the non-circular work piece, which rotateswhen it is machined, is designed according to the geometrical characteristics that the bladeis non-circular and has convex and concave surface at its section. There are left, middleand right support arms fixed on the device. When the work piece rotates, the left and rightarms form a “V”-shaped support type to the work piece and the included angle can beadjusted automatically according to the work piece posture while the middle is next to thecontour of the work piece and hold the bottom in real-time. The motion of the middle armis reciprocating and vertical. The trajectory algorithm that applies to the middle supportdevice was inferred out. The related geometrical model was constructed via analyzing thegeometry of non-circular section and the characteristics of storage format of DXF graphics.And a dynamic performance analysis and simulation of the trajectory for the algorithmwere executed.Secondly, in order to realize the automation control of the middle supporting device,a support control system was studied. The system consists of IPC, motion controller andNC system. The work of IPC is to monitor and operate the equipment overall, andcomplete the motion trajectory calculation. The motion controller controls the motors ofeach support arm to execute support motion. The rotation of the work piece and otherdevice control were completed by the NC system. At the same time, the researches andimplementation of data communication between the three modules of the system werecompleted. Finally, an interactive software on IPC used for fiber placement equipment wasdeveloped. The main interface of the software is divided into two parts, the monitoringarea and the operating area. The monitoring area monitors the running state of eachmodule of the device by reading data information from the NC system and motioncontroller. The operation area realizes the operation control of the device by writing data into the NC system and motion controller, meanwhile, calculates motion trajectories andwrites the motion controller according to the trajectory algorithm. The experimentalresults show that the software can meet the requirements of the users.