Weak Stiffness Of The Structure Of High-speed Milling And Deformation Control Technology

Low-rigidity workpieces with feeble rigidity are deformable during the machining process, it is difficult to be master of machining precision. High speed machining technology with less cutting force, low cutting temperature, high cutting speed and high machining precision has prominent predominance in the process of machining slot and thin-walled structure components. Relies on scientific research item, this dissertation based on CAD/CAE/CAM/HSM technology, from aspects such as cutting tool selection, workpiece clamping, cutter path strategy, using the method combined with theory analysis, numeric simulation, experiment validate, studies high speed milling of low-rigidity structure aluminum workpiece and its milling deformation control.Above all, this thesis analyses one representative low-rigidity workpiece's material, configuration and machining request, projects the whole technical plan. After taking into account of cutting tools' capability, parameter and market, the thesis selects the milling cutter. In succession, makes certain the fixture layout and clamping scheme of the workpiece. Calculates the cutter force and clamping force ofφ4 end mill milling slot, then a finite element model for clamping distribution of workpiece is carried out by ABAQUS 6.6 FEM. By the finite element simulation and analysis, the optimum scheme of clapming distribution is selected from 10 schemes. Based on the result of numeric simulation, fixture is designed by using Unigraphics 4.0 software. Next, to place the workpiece in UG CAM, confirms its trochoidal milling mode, sequence, parameters and so on. Finally, high speed milling of low-rigidity structure workpiece is performed on Mikron XSM600 machining center, measures milling force and surface roughness, analyses phenomena and machining effect of workpiece is observed. The experimental result is accorded with anticipative target, the surface of cavity is satisfied with machining request.The result of study has definite guidance meaning in ensuring milling quality of low-rigidity structure aluminum workpieces and enhancing machining technology level of high speed milling low-rigidity workpieces. Meanwhile, it offers some referenced value to the machining technology of other low-rigidity workpieces.