Papers by Author: Xue Dao Shu

Abstract: The mold for cross wedge rolling (CWR) is difficult in making, complicated in adjustment and high in costs. It is extremely meaningful to optimize the parameters for wear reduction to extend the mold life. This paper analyzes the influence of the processing parameters on the mold wear based on orthogonal experimental design method and the computer simulation method, which can optimize the parameters in an efficient and simple way. The results show that the rolling process using optimized technological parameters can greatly extend the mold life of the cross wedge rolling.

Abstract: Because most of the asymmetric shaft-parts have relatively large size in the axial direction, single-wedge cross-wedge rolling (CWR) exposes many imperfections, such as the huge roller, higher cost etc. The paper adopted finite element method (FEM) to simulate multi-wedge synchrostep CWR (MS-CWR) based on the typical asymmetric shaft-part, and gained its distribution and characteristics of stress and strain. In the knifing stage, the deformation of work piece only emerges on the local region, but in the stretching stage, most of regions are observed the deformation except two ends of the billet and the transition position between inner and outer wedge of multi-wedges. The results offer theoretical basis for promoting and applying MS-CWR technology on asymmetric shaft-parts.

Abstract: When forming automobile semi-axle using Multi-wedges Cross-Wedge Rolling (MCWR), it is difficult to avoid the rolling bending phenomenon. Thus to improve the product quality for finding out the causes and preventing rolling bending is essential. In this paper, the finite element model(FEM) analysis software Deform-3D was used to analize the bending causes, and giving the corresponding measures from numerical simulation of the forming of multi-wedge automobile semi-axle using Cross-Wedge Rolling. Based on the corresponding simulation experiments, the results indicate that the seasures is feasible. The results of this study for rolling forming of automobile semi-axle can improve product quality and provide a theoretical basis.

Abstract: For guiding production effectively and revealing rolling mechanisms, the analysis of rolling-pressure distribution regulation is very important. Because rolling strip belongs to multi-object contact engineering problem which involves coupling deformation, obviously the accuracy of disaggregate mathematical method is low. Therefore, in this paper,it is developed that multi-object, elasto-plastic and frictional contact multipole Boundary Element Method (BEM) by Fortran program. It can simulate five object synchronous contact accurately without artificial assumption.The three dimensional rolling-pressure distribution regulation of rolling strip has been obtained through this program. Through testing and calculating the load properties of bearing, the result shows that it is accordant for test and calculation. Therefore, multi-pole BEM is one of the effective numerical analytic tools of rolling contact problem, and the obtained result of rolling-pressure distribution can provide for reference value for analyzing rolling strip.

Abstract: The guiding roll is an important part of the ring rolling equipment which plays an important part in stabilizing the rolling and ensuring the quality of product. This paper obtained the formula for instant diameter of ring during the rolling process and established the motion equation of guiding roll. The angular velocity, instant displacements in X and Y direction of guiding roll center were calculated by MATLAB software. The numerical simulation of ring rolling of ring with rectangular cross sections was completed under the ABAQUS/Explicit environment after importing the instant displacement of guiding roll center. The simulation results indicate that the guiding roll could be controlled accurately by the proper method. These research conclusions can provide scientific basis for ensuring the quality of product and accurately controlling the movement of guiding roll during the ring rolling.

Abstract: Blank shape design is the prerequisite and foundation of optimization for the closed forming the high-neck flange. This paper obtained the design formulas of blank size with analyzing the mathematical model of flank blank based on the principle of volume invariably during the rolling process.The blank of a special flange was designed by this method which was validated by the numerical simulation under the DEFORM software. The results indicate that the product is qualified with the blank shape based on this method. These research conclusions can provide scientific basis for forming the high-neck flange with rolling method.

Abstract: Because of unbalanced axial force of cross wedge rolling asymmetric shaft-parts causing the rolling play and not stably, it is key factors to restrict application in asymmetric shaft-parts of cross wedge rolling. Axial force balance depends on technical parameters. So the influence regularities of axial force to technical parameters is researched in this paper by Ansys-Ls/Dyna finite element software. Finite element model is authenticated by experiment of rolling force, and the influence regularities of axial force of cross wedge rolling asymmetric shaft-parts is get. It will provide a theoretical basis for choosing reasonable parameters in mold design of cross wedge rolling asymmetric shaft-parts.