第43卷第2期 Vol. 43No. 2
假压技木
FORGING & STAMPING TECHNOLOGY
高速冷敲花键性能层力学性能及力学模型分析
牛婷2，李永堂1,2
（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）
2018年2月 Feb.2018
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，进面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一位移曲线、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.
839
至36.11%，
由20.50%提高至31.88%；冷颜花键性能层是
种沿花键表层至芯部，
到了该性能层加载-位移曲线以及显微硬度力学模型
显微硬度与弹性模量的比值依次
齿侧、齿根方向的空间梯度性能层。得
以及齿项、
该力学模型与其结构组织密切相关
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 DOI; 10. 13330/j. issn. 1000-3940. 2018. 02. 012
中图分类号：TG315.79
文献标识码：A
文章编号：1000-3940（2018）02-0062-07
Analysis on mechanical properties and mechanical model of performance layer for
high speed cold roll-beating spline
Niu Ting'-2, Li Yongtang'.2
( 1. School of Materials Science and Engineering, Taiyuan University of Science and Technology , Taiyuan 030024, China;
2. Shanxi Key Laboratory of Metal Forming Theory and Technology , Taiyuan 030024, China)
Abstract : The distribution of mechanical performance and the related mechanical model of high speed cold roll-beating spline were stud-ied. Based on the existing researches, the region of performance layer for spline was determined, and regions of test points were deter mined. Then, the nanoindentation tests were conducted by nanoindentation technique, and the load displacement curves, microhardness
distribution curves and elastic modulus distribution
re obtained. Furthermore, the wear resistance of performance layer was stud-
ied by analyzing the ratio of microhandness and elastie modulus.
The results show that the microhardness increases from 15. 83% to
36. 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 in-creases 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 displace-ment curve and the microhardness are obtained, which is closely related to the microstructure.
Key words : high speed cold roll-beating spline; nanoindentation; microhardness; elastic modulus; wear resistance; mechanical model
高速冷花键成形工艺是在调质处理后的坏料轴上进行高速击打形成花键齿，使花键齿表层一定深度内的性能在调质处理后的基础上进一步得到提升。相关研究表明，工件经过高速冷敲在花键
收稿日期：20171006；修订日期：20171221
基金项目：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
作者筒介：牛婷（1986-），女，博土研究生 E-mail: niuting861010@ 163, com
通讯作者：李永望（1957-），男，博士，教投万方数据il：liyongang@ tyust.edlu.en
的表层获得了一定深度的高性能层，该性能层相对冷蔽前工件微观组织结构以及力学性能有很大的改变，经高速冷敲形成的花键可作为普通花键所不能用于的重要行业领域的重要承载零件[1-3]。目前对于该性能层已经做了一些相关研究[4]，得出了该性能层具有较高的强度、硬度以及耐磨性，但针对该性能层的力学性能参数研究还不够充足，并且整个花键齿面性能层的具体分布以及相关力学模型情况尚不是很清楚。高速冷敲成形属于局部表面成形，近表层性能显著提高，所以，该性能层有一定的尺寸限制，并且受到冷敲花键轴基