Research On Application Of Prestressed Grinding Hardening Technology In Cylindrical Grinding

Prestressed grinding hardening technology is a new kind of processing which integrates both prestressed cutting technology and grinding hardening technology, and applies them into grinding. Prestressed cutting technology can reduce residual tensile stress on workpiece surface after processing effectively and accurately, even change residual tensile stress to compressive stress; Grinding hardening technology can take advantage of massive heat generated in grinding processing effectively and produce quenching hardening layer on workpiece surface. Prestressed grinding hardening technology combines the advantages of both technologies, and improves surface quality and performance of workpiece after processing. At the same time, it can also simplify processing, improve production efficiency and reduce environmental pollution. If applied into actual production, it will produce lots of social and economic benefits.In previous studies, prestressed cutting technology and grinding hardening technology were researched separately and most of them were applied to surface grinding rather than cylindrical grinding. For the existing problems in previous studies, this paper researches the application of prestressed grinding hardening technology in cylindrical grinding from the following two aspects based on the theory of grinding principle, finite element analysis, thermoplastic deformation, heat treatment, and so on.Prestressed grinding hardening process in cylindrical grinding is simulated by general finite element software ANSYS. The interaction between prestressed cutting technology and grinding hardening technology, the feasibility and application effect to integrate the two technologies and apply them to cylindrical grinding are analyzed. By simulating the temperature fields of cylindrical grinding hardening in different grinding depths and rotating rates of workpiece, the range of feasibility for cylindrical grinding hardening and the variation trend for the thickness of quenching hardening layer with grinding depth and rotating rate of workpiece are summarized. By simulating the residual stress-strain fields of cylindrical prestressed grinding hardening in different grinding depths and rotating rates of workpiece, the effect of integration and the variation trend for the thickness of work hardening layer with grinding depth and rotating rate of workpiece are summarized.The prestressed fixture which can be applied into cylindrical grinding is designed and analyzed. The structural design is completed by analyzing the basic requirements of the prestressed fixture and the selection of workpiece, bearings and machine. The transitive relation between the torque applied on the screw arbor and the prestress applied on the workpiece is obtained and the strength of every part of the prestressed fixture is checked by theoretical calculation and finite element analysis. Through theoretical calculation, the screw pair and the screw arbor can meet strength requirements. Through finite element analysis, the other parts of the prestressed fixture which have more complex structure and force condition can also meet strength requirements. By modal analysis of the prestressed fixture, the obtained natural frequencies and vibration modes of the prestressed fixture can provide basis for its practical application and structural optimization.