高速冷敲花键性能层力学性能及力学模型分析  

Analysis on mechanical properties and mechanical model of performance layer for high speed cold roll-beating spline

作　　者：牛婷[1,2] 李永堂 Niu Ting;Li Yongtang(School of Materials Science and Engineering, Taiynan University of Science and Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Metal Forming Theory and Technology, Taiyuan 030024, China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]金属材料成形理论与技术山西省重点实验室,山西太原030024

出　　处：《锻压技术》2018年第2期62-68,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51475316);山西省重点学科建设经费资助

摘　　要：分析了冷敲花键齿面力学性能的分布情况,并建立相关力学模型。在现有研究基础上,确定花键齿面性能层区域,进而确定本试验的测试点区域。利用纳米压痕测试技术,对测试点进行纳米压痕试验。得到了各测试点的载荷-位移曲线、显微硬度分布曲线、弹性模量分布曲线。通过分析显微硬度与弹性模量比值,研究了冷敲花键性能层抗磨损性能情况。结果显示：在距离花键表层80μm处,从齿顶到齿根,硬度相对芯部依次提高15.83%至36.11%,显微硬度与弹性模量的比值依次由20.50%提高至31.88%;冷敲花键性能层是一种沿花键表层至芯部,以及沿齿顶、齿侧、齿根方向的空间梯度性能层。得到了该性能层加载-位移曲线以及显微硬度力学模型,该力学模型与其结构组织密切相关。The distribution of mechanical performance and the related mechanical model of high speed cold roll-beating spline were studied. Based on the existing researches,the region of performance layer for spline was determined,and regions of test points were determined. Then,the nanoindentation tests were conducted by nanoindentation technique,and the load displacement curves,microhardness distribution curves and elastic modulus distribution curves were obtained. Furthermore,the wear resistance of performance layer was studied by analyzing the ratio of microhardness and elastic modulus. The results show that the microhardness increases from 15. 83% to36. 11% from the tooth top to the tooth roof away from the spline surface of 80 μm,and the ratio of microhardness and elastic modulus increases from 20. 50% to 31. 88%. However,the performance layer belongs to a spatial gradient performance layer,which is along the tooth top,the tooth flank to the tooth root and along the spline surface to the core. In addition,the mechanical models of loading displacement curve and the microhardness are obtained,which is closely related to the microstructure.

关 键 词：高速冷敲花键 纳米压痕 显微硬度 弹性模量 抗磨损性能 力学模型 

分 类 号：TG315.795[金属学及工艺—金属压力加工]