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| Research on the Geometric Parameters Optimization of W1 Fastening Clip Used in High- speed Railway |
| HU Lian-jun, YANG Ji-zhong, LI Zhong-ji, LIN Hong-song, FENG Du-bei |
| (China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China) |
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Abstract Abstract：Research purposes： As the key part of the fastening system, fastening clip is attracting more and more attention to its structure design, performance analysis and parameters optimization. Taking W1 fastening clip commonly used in China high-speed railway as a research objective, by using DOE(design of experiment) method, the fastening clip's geometric parameters and their effects on the mechanical properties are studied in this paper. The parameters optimization is finally carried out, which has a certain significance on the shape design of the fastening clip. Research conclusions： (1)There are 11 structural parameters of W1 fastening clip, which have influence on its service performance. The most significant effects on the service performance are: spring deflection T, diameter d, arch L0, unfolded drawing b2 and R2. (2)The main change of domestic ω-type elastic clip is to increase the deflection T, diameter d, and arch L0. However, Vossloh fastening clip adopts an approach of reducing b2 and increasing R2 to enhance the performance. (3)According to the response camber optimization design, with the spring deflection T and diameter d fixed, the optimal conditions of fastening clip are: arch span L0 is 80.12 mm, unfolded drawing R2 is 26.03 mm, unfolded drawing b2 is 32.79 mm. Results show that the clamping force is 10.049 kN, the maximum stress is 1 298 MPa, the optimization index W is 0.156. The clamping force and the maximum stress increases a little, but the material is more economical, the optimization index increases a little. Thus, the optimal fastening clip is better than the original W1 fastening clip. (4)DOE(design of experiment) could propose the optimal parameter combinations through the coordinated change of parameters in order to meet the design requirements of fastening clip. (5) The research results can provide a reference for the shape design optimization of other similar fastening clips.
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Received: 05 October 2017
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2017, Vol. 34 
