Numerical Control Machining And Wear Resistance Analysis Of Spindle Hole Of Knotter Driven By Double Discs

In this paper,the key parts of the double-toothed disc D-type knotter are complex.The main shaft holes in the bracket have strict and complicated spatial positional relationship.It is difficult to manufacture.Most domestic enterprises rely on imported knotters to produce balers.The precision manufacturing technology of the key part bracket of the toothed disc D-type knotter is studied,the NC machining process of the bracket is determined,the special fixture is designed,the machining quality is tested,and the NC machining error caused by the blank casting error is analyzed.It is derived from the Achard wear model.The wear calculation model of the main shaft hole of the bracket,the wear simulation calculation of the main shaft hole,monitoring the wear state and predicting the wear life.(1)Five-axis CNC machining method and numerical control machining simulation of bracket:The shape characteristics of the bracket are analyzed,the processing content and technical requirements are clarified.On this basis,the machining plan of the bracket is determined,the CNC machining process route is established,the NC machining process is designed,the positioning of the parts and the fixture design,the selection of the tool,and the determination of the cutting amount are determined.And the setting of the machine tool.Using the UG module,a three-dimensional dynamic simulation of the machining process of the five-axis CNC machine tool holder is carried out,and the movement of the machine tool,the workpiece and the tool is dynamically displayed,and the interference inspection between the moving parts is performed,and the workpiece is The overcut is checked to complete the five-axis NC machining simulation of the bracket.(2)Inspection accuracy and machining error analysis of the bracketUsing the hand-held 3D laser scanner,geomicic's model reconstruction module and ug3 D modeling software,the contour scan of the finished double-toothed disc d-type knotter part bracket,model reconstruction,and the original design model assembly comparison error analysis.Analysis of the inevitable casting error of the blank leads to the offset of the position of the tool point.The wrong machining coordinate system on the bracket blank isnot consistent with the original programmed coordinate system,thus affecting the coordinate position of the remaining axis hole drop point.alternative relation(3)Analysis of wear resistance of bracket spindle hole:The wear model of the bracket spindle hole is derived from the Achard wear model.The contact stress calculation was performed on the simplified model of the spindle hole and the drive shaft by ANSYS.According to the derived wear model of the spindle hole,the interval of every 30 degrees in the process of rotating the drive shaft is a discrete point,and the wear amount of each discrete point and the wear of the wear at the maximum discrete point at the discrete point are simulated.the amount.(4)Verification test of stent processing quality:The double-toothed disc knotter and the German knotter were installed on the square bale baler,and the comparison experiment of the lower field was carried out,1200 hits.The success rate of the knot is 100.Using the knotter performance test and the reliability test bench to perform the knot test on the NC machined bracket,the results of 10,000 knotting tests show that the knotter drive is stable and the coupling between the mechanisms can be smoothly completed.Knot action,no motion interference occurred.