Papers by Keyword: Radial-Axial Ring Rolling

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Authors: Li Bo Pan, Lin Hua, Jian Lan
Abstract: An effective method was proposed to simulate and control the motion track of guide roller during radial-axial ring rolling in FE simulation. The 3-D finite element model was constructed according to the principle and feature of rolling technology. The rolling process was simulated and analyzed by using dynamic explicit finite element technology. The different rolling processes with different technology parameter were simulated. The width spreads and rolling forces under different parameters are compared and analyzed. The results indicated that high quality ring product could be obtained when rational parameters in radial and axial were assigned.
1903
Authors: Yu Long Tan, Qiang Wang, Shuang Hui Han, Fang He
Abstract: The FEM model of radial-axial ring rolling experimental equipment was established by using ANSYS through processing contact, constraints and loads. The structure stiffness and strength of both radial rolling system and axial rolling system were analyzed based on the analyses of distributions of Von Misese stress, equivalent strain and deformation. It is shown that both the two systems will be within the safe range without any plastic deformation during ring rolling process, and their stiffness is also satisfied with design requirement, which proves the successful design of the radial-axial ring rolling experimental equipment.
2201
Authors: Tao Wang, Qiang Wang
Abstract: A mechanical model of axial ring rolling is established. According to the analytical method, the calculation formula of axial ring rolling contact area and unit rolling force is derived. On this basis the calculation formula of axial rolling force is derived. The influence of processing parameters on the axial rolling force is investigated. It is found that the axial rolling force increases with the increase of the outer diameter of ring, and the axial rolling force decreases with the increase of the inside diameter of ring. The greater the feed in axial direction, the greater the axial rolling force.
1344
Authors: Tao Wang, Qiang Wang
Abstract: The importance of the axial rolling torque to design equipment and process is described. On the basis of the established formula of axial rolling force, the formula of axial rolling torque is derived by using the moving volume theory of energy method. The influence of processing parameters on the axial rolling torque is investigated. It is found that the axial rolling torque increases with the increase of the outer diameter of ring, and the axial rolling torque decreases with the increase of the inside diameter of ring. The greater the feed in axial direction, the greater the axial rolling torque. The correctness of the formula is verified by calculating actual examples.
589
Authors: Simon Husmann, Bernd Kuhlenkötter
Abstract: Seamless rings are applied in several industrial sectors and are mainly produced by radial-axial ring rolling. Ring climbing is one of the most occurring process errors leading to a distortion of the ring’s cross section. This paper presents the determination of the influencing factors and their impact and correlations on the process error of ring climbing via Design of Experiment. The highest impact on the climbing height of a ring has the adjustment of the rolling table and the guide rolls. Relatively low but still noticeable is the influence of the process parameters of the rings displacement and the unequal axial rolling speeds. With this knowledge it will be possible to develop, test and implement a rolling strategy that may reduce or avoid ring climbing successfully.
19
Authors: Ping Zhen Zhou, Li Wen Zhang, Sen Dong Gu, Hong Tao Duan, Li Hong Teng
Abstract: The process parameters including the mandrel structure of radial-axial ring rolling is in close relationship with the forming defects such as over-high axial spread and the folding defect in the connecting part of the big and small ring. In this paper, a 3D rigid-plastic and coupled thermal-mechanical finite-element model (FEM) of radial-axial ring rolling for large-scale T-sectioned ring was developed using commercial software of DEFORM-3D. By changing the chamfer radius of mandrel's work roll, the effects of mandrel structure on the height of axial spread which considerably affects the stability of the ring rolling process were investigated. The folding defect was also simulated. The numerical simulation results showed that with the decrement of the chamfer radius r, the metal increasingly accumulated in the big ring and the axial spread height increased. Consequently, the ring rolling process became unstable. Also, the folding angle augmented.
2307
Authors: Shi Biao Liu, Ke Lu Wang, Shi Qiang Lu, Xin Li, Xian Juan Dong
Abstract: Radial-axial ring rolling is an important component of advanced manufacturing technology, but it has characteristics of high nonlinear on geometry and physics, so the radial-axial ring rolling process becomes very complex. In addition, the feeding mode of core roller has enormous influence on the quality of the rolled ring as well as the stability of the process. In this paper, a 3D rigid-plastic FE model of radial-axial ring rolling process is established, then three kinds of feed speed design ((1)constant of feed speed; (2)constant of feed in one rotary; (3)variation of feed speed)are offered. The difference of outer radius growth velocity, distribution of effective strain and temperature, rolling force, size of ring are analysised for the three kinds of feed methods. And, an optimized feed method is proposed base on analytic results, the optimized feed method can improve the quality of formed ring, and decrease the requirement of ring rolling mill.
513
Authors: L.G. Guo, He Yang
Abstract: Nowadays, 3D-FE Modeling and simulation is an indispensable method for the optimum design and precise control of radial-axial ring rolling process for its complexities. In this paper, the unique forming characteristics of radial-axial ring rolling have first been summarized, and then some key technologies for 3D-FE modeling of the process have been presented and their solution schemes have been given out, lastly the modeling and simulation of radial-axial ring rolling process have been realized using elastic-plastic dynamic explicit procedure under ABAQUS environment. The work provides an important basis and platform for the future investigations, such as forming mechanism and laws, process optimum design and precise control.
367
Authors: Tobias Husmann, Dieter Kreimeier
Abstract: Radial-axial ring rolling is a hot forming technology to produce seamless rings, which are used in several industrial sectors, such as gear manufacturing, aviation and aerospace as well as transportation and energy. The use of allowances in the industrial production of these rings via radial-axial ring rolling is still very common to ensure that the rings’ final dimensions are reliably inside the given tolerances. Rolling a ring with allowances causes a lot of additional costs, for example purchasing and processing of the extra material.To enable ring manufacturers to reduce allowances for periodical ring errands, a rating of rings directly after the rolling process is benefical. In this paper the approach using image processing and thermography to detect the outer diameter and the surface temperature of the rolled ring to allow for a rating will be presented.
278
Authors: Simon Husmann, Tobias Husmann, Horst Meier
Abstract: Seamless rings are used in several industrial sectors and are mainly produced by radial-axial ring rolling. To be able to detect process or form errors, which nowadays cannot be detected reliably by the conventional sensor technology of a radial-axial rolling machine, an image pro­cessing device has been mounted above the table of the ring rolling machine. This paper introduces the possibilities for measurements via image processing during and after radial-axial rolling of rings.
136
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