Research On The Forming Of Clintheriform Straight Gear’s Tooth-proifle By Closed Extruding Fine-blanking

The technology of gear ring platen fine-blanking has developed into an advancedclintheriformed precision contour profile forming technology for its one-time forming tohave higher dimensional accuracy, glabrous shaping surface and ancillaries with littlewarpage. But due to its inability to form components with low plasticity and high thickness,its development has been impeded. This dissertation is aimed at a research on a newtechnology-closed extruding-type fine-blanking that can form thick-plated materials withlow plasticity. And the research on closed extruding-type fine-blanking is carried out withchanging curvature on the basis of the successful fine-blanking of round pieces with lowplasticity and higher thickness, creating favorable conditions for the industrializedproduction of the technology of closed extruding-type fine-blanking.In this dissertation, the results of the research reveals that the closed extruding-typefine-blanking is capable to provide a channel for higher three-way stress through apreliminary research on the mechanism of closed extruding-type fine-blanking, in themeantime an analytical research concerning the forming surface is performed on thehardening phenomenon, grain refinement phenomenon, metal streamline of the componentas well as the defects such as in the components such as cracks in the forming surface,addendum sagging, dedendum ripping; secondly, on the basis of obtaining the parametersof the mechanical properties of the materials, the DEFORM-3D software simulation isadopted to carry out an research on the forming patterns and regular laws of the mainparameters (mould clearance, lubrication and the strength of jacking counterforce), alongwith the optimal value of mould parameters and technological parameters of the contourprofiles with changing curvature formed through the closed extruding-type fine-blankingtechnology; in addition, experimental moulds fitting the the technology of closedextruding-type fine-blanking are successfully manufactured under the guidance of theoutcome of finite element simulation analysis; finally, physical experiment are performedto demonstrate the results of finite element simulation, and a research is conducted on theforming laws of the closed extruding-type fine-blanking contour profiles with changingcurvature. The solutions to the defects of surface cracks, addendum sagging, dedendumripping have been found out through the research and analysis on the component qualityproblems appeared in the process of finite simulation and physical experiment.The research shows that components with low plasticity, high thickness, intricate contour and precision measurement can be shaped through altering such factors as themould-entering fillet, die clearance, jacking counterforce in the technology of closedextruding-type fine-blanking; the gear components boasts smaller addendum roll-over andhigher shaping surface quality. Tooth-profiled components with quality as high as96%aresuccessfully manufactured by means of the finest closed extruding-type fine-blankingtechnology, laying foundations for the industrialized production of closed extruding-typefine-blanking.