基于多工序旋压的内外齿形件力学性能研究

Research on mechanical properties for internal and external toothed parts based on multi-process spinning

通过单向拉伸试验和硬度试验,探究了SPHC热轧钢板的各向异性,获得了SPHC热轧钢板的相关力学性能,量化了各工序件的力学性能参数,并对SPHC热轧钢板材料进行了应变硬化函数拟合。结果表明:SPHC热轧钢板材料的各向异性不明显,其屈服强度为251 MPa、抗拉强度为371 MPa、屈强比为0.68、伸长率为44%以及硬化指数为0.190。从原始坯料到内外齿形件,旋压工艺使材料的抗拉强度由371 MPa增加至485.5 MPa,上升了31%;屈服强度由251 MPa增加至475 MPa,上升了89%;屈强比由0.68增加至0.95;硬度由136 HV增加至188~216 HV;硬化指数由0.190降至0.028。最终通过Swift、Voce及Swift+Voce的应变硬化函数拟合对比,获得了SPHC热轧钢板材料的应变硬化函数。

The anisotropy of SPHC hot rolled steel plate was investigated by unidirectional tensile test and hardness test,and the related mechanical properties of SPHC hot rolled steel plate were obtained.Then,the mechanical property parameters of each process part were quantified,and the strain hardening function of SPHC material was fitted.The results show that the anisotropy of SPHC material is not obvious,the yield strength is 251 MPa,the tensile strength is 371 MPa,the yield strength ratio is 0.68,the elongation is 44%,and the hardening index is 0.19.From the original blank to the internal and external toothed parts,the spinning process increases the tensile strength of the material from 371 MPa to 485.5 MPa,an increase of 31%,and the yield strength is increased by 89%from 251 MPa to 475 MPa,the yield strength ratio is increased from 0.68 to 0.95,the Vickers hardness is increased from 136 HV to 188-216 HV,and the hardening index is decreased from 0.19 to 0.028.Finally,through the fitting and comparison of the strain hardening functions of Swift,Voce and Swift+Voce,the strain hardening function of SPHC material is obtained.