Study on the influence of fine particle peening on the surface properties of the flexible wheel of harmonic reducer
LUO Jiayuan
YANG Chenglin
ZHANG Hongqiang
XIANG Duo
YANG Qin
Abstract：[Objective]The bending strength of tooth roots of harmonic reducer flexsplines can be enhanced by fine particle peening.However,the influence laws of shot peening air pressure and coverage on flexspline surface properties have not been clarified due to the high cost of fine particle peening tests.Systematic investigations on parameter effects were conducted by combining numerical simulation and test methods.[Methods]Firstly,a random multi-shot elastoplastic fine particle peening simulation model was constructed via the coupling of finite element method and discrete element method to reproduce the real working condition of continuous multi-shot impact.Secondly,a single-tooth model with local refined grids of the flexspline was established by SolidWorks software and Abaqus software to provide a high-precision calculation carrier for micron-scale peening simulation.Then,multiple groups of fine particle peening tests with controlled parameters were carried out,and residual stress and surface roughness were measured by a micro-area stress tester and a roughness profiler.Finally,simulation and test data were compared,and the influence laws of two types of process parameters on surface properties were quantitatively analyzed.[Results]The results show that the simulation results are in good agreement with the test results,with a maximum error of 11.36％.The maximum residual compressive stress,its peak depth and the depth of residual compressive stress layer all increase with the rise of shot peening air pressure,and the compressive stress layer depth reaches 70 μm at 0.6 MPa air pressure.The surface residual compressive stress and maximum residual compressive stress increase with the improvement of shot peening coverage,while the stress layer depth shows no significant change.All roughness parameters increase obviously with the rise of air pressure,while the influence of coverage is weak with low growth amplitude of the arithmetic mean deviation of roughness profile.References for the optimization of flexspline peening processes can be provided.
Keywords：Flexible wheelFine particle peeningResidual stressSurface roughnessShot peening air pressure
Publication Date：2026-08-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 175-182 )