Study On The Deformation Of Forced Fitting Between Spindle Blade And Spindle Wharve While Assembling Spindles

Spindle is one of the major components of spinning machine's twisting and winding,it is a elongated shaft assembly ,spindle wharve and spindle blade are the main parts. Spindles are wearing parts, with normal conditions, China's annual demand is about 8 million. Spindle wharve and spindle blade are forced fitted by pressing-in method.Currently widely, combined as a revolving body. Because there are many factors influencing the parameters of interference assembly process, leading to deformation of the spindle after forced fitting, the given test points'radial run-out of conjunction is overproof. Therefore, analyzing the deformation of the spindle after forced fitting, improving the assembly precision for the enterprise has a certain practical significance.In this paper, spinning spindles (D32) as the research object without taking into account the impact of press-fit equipment's accuracy in the premise, focusing on analysis of other parameters of assembly process, in particular the interference on the deformation of forced fitting. First, according to the formulas which national standard gives,it can calculate the theoretical limit interference with existing process parameters, and use the greatest interference as a reference value to determine three different interference for the key parameter of follow-up analysis; Followed by the use of finite element theory and ANSYS software, to simulate spindle wharve and spindle blad forced fitting process, obtained equivalent stress cloud graphics of spindle blade and spindle wharve with three different interference.When using ANSYS software to simulate, in view of spindle blade and spindle wharve are completely axisymmetric graphics, using two-dimensional instead of three-dimensional, streamline operations to improve the solution speed; taking into account spindle blade and spindle wharve graphics are complicated, gridding them with the free choice of gridding classification model; when dealing with the contact problem, we can use the face-face contact of state non-linear analysis to simulate and analyze. Finally through testing the radial circle run-out errors of three different groups spindle blades and spindle wharves and their related interference, comparing with calculations and simulations, the results can confirm each other, so indicate that the findings are credible .To sum up, this study reached conclusions:the interference which forced fitting D32 spindles actually is quite large, it is one of the important reasons which caused nearly a third of spindles for repairing; with the actual forced fitting interference, the spindle blade's stress is less than spindle wharve in the contact part, the maximum stress and strain values are still in the elastic range, but the stress of spindle wharve is beyond elastic range in the contact part; when pressed into the amount of 2mm, the largest interference is 0.04mm (which is closed to the maximum interference of 0.038mm reached by calculation), the deformation of spindle blade and spindle wharve after forced fitting is the smallest. The results of this study provide a reference for the enterprises to improve assembly process of spindle blade and spindle wharve,and improve assembly precision , but also lay the foundation for follow-up spindle automatic assembly system design.