Study On Visual Kinematics Simulation Of JDYP51 Model Virtual Axis Polishing Machine Tool

Modeling,simulation and virtual reality are inevitable factors to design aVAMT(virtual axis machine tool). Its aim is to forecast and optimize machinetool's performance. Specially, VAMT's whole layout having much diversity, weshould make the machine tool's 3D model and simulate and optimize itsperformance .It is rather necessary when we design the whole style.This dissertation mainly carried out the 5-coordinate VAMT's kinematics,working space,interference and machining simulation verification analysis .Thismachine tool is designed alone by JiLin University .We simulated the machiningprocess and visualize the workspace and we also carried out several possibleinterferences analysis and test. At last, we have a machining experiment and testthe machining performance .It is have much action to machine more complicatedfree-form surface experiment.ONE: VAMT's Movement SimulationFirst of all,this dissertation had a modeling to the 5-coordinate VAMT withadvanced modeling software UG3.0 , summing up the characters of the machinetool's series parallel connection structure and basing on analyzing machine toolstructure .The model was leaded in ADAMS 2005.0 in "Parasolid"exportingstyle and added constraints and Motions. After model was validated successfully ,we had a simulation to the helix. Firstly de-active the three feed screws andcorresponding screw-pairs. After that, we joined helix to the ground, added camconstraint between the helix and the principal axis and put on the Point-Motionwhose direction is downwards to make principal axis work along helix. Put on thesimulation button and carry out a simulation. We can measure three curves fromthe three translational constraints and translate them into spline curves. After that,de-active Point-Motion and active the three feed screws'motion and screw-pairs.At the same time ,we should modify the three motions .Here, we should use a newfunction:AKISPL(FI ,SIV,SN,DO),this function is used to reading data fromspline function.The three feed screws'drive function is like those below motion₁= -akispl(time,0, SPLINE ₁,0)*360d motion₂= -akispl(time,0, SPLINE ₂,0)*360d motion₃= -akispl(time,0, SPLINE ₃,0)*360dDefine simulation's time and steps, then carry out a simulation. From theresult of this simulation, we can know that principal axis move along the helix andis just the same as we have expected.Two: VAMT's work space analysisRobot's workspace is scope of robot and is one of the important factors .Wede-fine robot's workspace as can-reach workspace and flexible workspace.This dissertation carefully analyzes the VAMT's workspace's shape and factorsthat are affected. We have the working space through controlling limit position .Sowe can have the whole the polishing instrument's workspace.Open the ADAMS and import VAMT model. Then, we design thesimulation's time and steps and carry out a simulation. Firstly, we consider movingplatform's workspace: using of the function's "Trace Spline"and controlling theconstraint relationship of reaching the interference, we finally know the movingplatform workspace's borderline curves. Polishing tool center's can-reachworkspace have changed both shape and size, but its height is not changed andonly its position is lowed l₄ cosφ_max . At last, we can get the polishing toolcenter's borderline condition. At the same time, we also get the formation of themachine tool's workspace with UG..Three: VAMT's interference analysisThis dissertation also carried out interference analysis. After analysis we cansee that VAMT basically have three possible interferences.1. Block's track exceed the its maximum journey2. Hooke-hinge's tilt angle exceed its maximum angel3. U-fork has a collision with the bracket.As to the first and the third possible interferences , we used "clearancestudies "to verify them. We firstly choose them and then software canautomatically compute the minimum distance between them. Save the result afterthe software computed successfully. We can conclude the frames and time whenthe minimum distance occurred. The result must remind you "coordinates notavailable when minimum distance is a collision"and it means that one interferencehappened.The second interference can be judged by computing the minimum distancemanually. The whole result indicates: Hooke-hinge has a interference with thebracket. The two others have no interference occurred.Four: Kinematic simulation of VAMT's machining experimentAt the end of this dissertation, The author make a analysis and simulation withthe machine tool's machining experiment .The observer can see the polishingtool's track and find the interference in time by using ADAMS software. Firstly,get data of the free-form surface and lead the data into the ADAMS .At the sametime, we fix the curve to the ground. Then de-active three feed screws andscrew-pairs. Add the point-curve constraint and point-motions. Open a newsimulation script and input script orders in "Creat Simulation Script"dialogbox . Put on the button and run asimulation. We can Get threetranslational constraints'displacementcurves and translate them into splinecurves. Then we also should activethat three feedscrews and screw-pairsand de-active the polishing tool'smotion. The motions of feed screwsstill use with "aksipl"function. Thenpress the simulation button, run a simulation. We can clearly find that thepolishing tool's track is the same as we have added before.In the course of simulation, we don't find any interference and the movementis so smooth and continuous. Fixes the workpiece to the VAMT rightly and set the...