Research on Force Parameter and Deformation Mechanism in the Cold Rolling of Bearing Inner Ring

2011 ◽  
Vol 101-102 ◽  
pp. 534-537
Author(s):  
Bao Shou Sun ◽  
Liang Tao Qi ◽  
Xue Dao Shu
Keyword(s):  
Cold Rolling ◽  
Process Parameters ◽  
Deformation Mechanism ◽  
Rolling Force ◽  
Rolling Process ◽  
Ring Rolling ◽  
Force Parameter ◽  
Finite Element Software ◽  
Deep Groove ◽  
Deform 3D

In this paper, the simulation model of the cold rolling process of the deep groove bearing inner ring was established by using the finite element software Deform-3D. The numerical calculation of the model was made with different process parameters. The law of the influence the process parameters on the rolling force was analyzed. The deformation mechanism of the cold rolling process of the inner ring was revealed. The research indicated that the feed rate of idle roller had the greatest influence on the cold rolling process. Finally the experiment using the XS-50 precision CN ring rolling machine was carried on and a finished product of the inner ring of a better quality came out. It verified that the numerical simulation could provide theoretical basis for the practical production process.

The Research on Diameter Growth of Deep Groove Ball Bearing Inner Ring in Cold Rolling Process

2015 ◽  
Vol 1095 ◽  
pp. 883-887 ◽  
Author(s):  
Bao Shou Sun ◽  
Geng Feng ◽  
Xue Dao Shu ◽  
Liang Tao Qi ◽  
Shuo Pang
Keyword(s):  
Numerical Simulation ◽  
Cold Rolling ◽  
Ball Bearing ◽  
Rolling Process ◽  
Diameter Growth ◽  
The Core ◽  
Deep Groove ◽  
Cold Ring Rolling ◽  
Deep Groove Ball Bearing ◽  
Ring Diameter

There is a close relationship between cold ring rolling product quality and ring diameter growth rate in cold rolling process, but the technological parameters are main factors in influencing ring diameter growth. The paper used both numerical simulation and experimental verification to study the effect of the core roller speed and wide-diameter ratio on increment of ring diameter in cold rolling process of deep groove ball bearing inner ring. It is found that the core roller has greater influence on diameter growth, and the faster the feeding speed of core roller is , the greater the increment of ring diameter is. Finally, it is verified that the agreement between numerical simulation and experiments is good.

3-D Coupled Thermo-Mechanical FE Modelling and Simulation of Combined Ring Rolling

2012 ◽  
Vol 560-561 ◽  
pp. 1097-1102
Author(s):  
Zhi Qiang Zhang ◽  
Dong Sheng Qian ◽  
Lin Hua
Keyword(s):  
Rolling Process ◽  
High Energy ◽  
Poor Quality ◽  
Ring Rolling ◽  
Thick Wall ◽  
Fe Model ◽  
Fe Modelling ◽  
Deep Groove ◽  
Material Utilization ◽  
Temperature Force

Ring parts of duplicate gear, double-side flange, high pressure value body, are widely used in engineering machinery, have the common geometrical characteristic of thick-wall, small-hole and deep-groove on the surface. High energy consumption, low material utilization, low productivity and poor quality exist in the current forging technology of this type of rings. In this paper, a new forming method for this type of rings named combined ring rolling (CRR) is proposed. The forming principle of CRR is introduced at first, then, a 3-D coupled thermo-mechanical FE model for the CRR process of a double-side flange ring is developed. By simulation and analysis, the feasibility of CRR technology is testified, and the evolution and distribution rules of stain, temperature, force and power in the rolling process are revealed. The results provide the guideline for the research and development of CRR technology.

Dynamic Response Analysis of Tandem Rolling Mill in Rolling Process

2018 ◽  
Vol 764 ◽  
pp. 391-398
Author(s):  
Xing Han ◽  
Lian Jin Li
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Rolling Mill ◽  
Rolling Force ◽  
Rolling Process ◽  
Steel Pipe ◽  
Response Analysis ◽  
Dynamic Response Analysis ◽  
Finite Element Software ◽  
Seamless Steel

Due to the influence of rolling force fluctuations, tube size changes and material uniformity and other factors, vibration and other phenomenon inevitably occur in the rolling process of tandem rolling mill. This vibration has a great impact on the dynamic stability of the mill and rolling reduction, and will significantly reduce the dimensional accuracy and surface quality of seamless steel pipe. In this paper, the non-linear finite element software ABAQUS is used to simulate the rolling process of seamless steel pipe. First, rolling force of the first frame with the maximum rolling force of PQF rolling mill is calculated. The reliability of rolling force calculated by the finite element method is verified by the test experiment. The dynamic response analysis of the roll is carried out to obtain the dynamic response curve of the roll in the rolling state and to provide technical support for the rolling schedule with the calculated rolling force being the load.

The Rolling Force Analysis of Closed Ring Rolling High-Neck Flange

2012 ◽  
Vol 201-202 ◽  
pp. 1130-1134
Author(s):  
Wen Fei Peng ◽  
Jing Jing Liang ◽  
Xue Dao Shu ◽  
Bao Shou Sun ◽  
Min Xiao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Process Parameters ◽  
Rotational Speed ◽  
Rolling Force ◽  
Element Model ◽  
Ring Rolling ◽  
Force Analysis ◽  
Closed Ring ◽  
Feeding Speed

The rolling force will directly have influence on the size of high-neck flange and whether the rolled part will be shaped successfully. Finite element model of closed ring rolling high-neck flange was established, the effect of process parameters on rolling force and its reasons are analyzed. The results show that, the higher feeding speed is, the larger the amplification of rolling force will be, in addition, rolling force will be reduced slightly with the increase of rotational speed of driving roller, and the influence on the rolling force of compressing roller’s feeding speed is much larger than driving roller’s rotational speed.

Application of a Material Model to Predict Rolling Forces and Microstructure during a Hot Ring Rolling Process

2013 ◽  
Vol 762 ◽  
pp. 354-359 ◽  
Author(s):  
Thomas Henke ◽  
Gerhard Hirt ◽  
Markus Bambach
Keyword(s):  
Grain Size ◽  
Microstructure Evolution ◽  
Rolling Force ◽  
Flow Behavior ◽  
Rolling Process ◽  
Ring Rolling ◽  
Experimental Investigations ◽  
Forming Process ◽  
Ring Geometry ◽  
Ring Rolling Process

Ring rolling is an incremental bulk forming process. Hence, the process consists of a large number of alternating deformations and dwell steps. For accurate calculations of material flow and thus ring geometry and rolling forces in hot ring rolling processes, it seems necessary to consider material softening due to static and post dynamic recrystallization which could occur between two deformation steps. In addition, due to the large number of cycles, the modeling results, especially the prediction of grain size, can easily be affected by uncertainties in the input data. However, for small rings and ring material with slow recrystallization kinetics, the interpass times can be short compared to the softening kinetics and the effect of softening can be so small, that microstructure evolution and the description of the materials flow behavior can be de-coupled. In this paper, a semi-empirical JMAK-based model for a stainless steel (1.4301/ X5CrNi18-9/ AISI304) is presented and evaluated by the use of experiments and other investigations published in [1],[2]. Finite Element (FE) simulations of a ring rolling process with a high number of ring revolutions and thus multiple, incremental forming steps were conducted based on ring rolling experiments. The FE simulation results were validated with the experimentally derived rolling force and evolution of ring diameter. The microstructure evolution was calculated in a post processing step considering the investigated evolution of strain and temperature. In this calculation the interrelations between the fraction of dynamically recrystallized microstructure, the evolution of post-dynamically recrystallized microstructure and the final grain size have been considered. Both, the calculated final microstructure and the evolution of rolling force and ring geometry calculated stand in good agreement with the experimental investigations.

Finite Element Analysis of Thin Strip Profile in Asymmetric Cold Rolling Considering Work Roll Crossing and Shifting

2014 ◽  
Vol 1061-1062 ◽  
pp. 515-521 ◽  
Author(s):  
Abdulrahman Aljabri ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Finite Element Model ◽  
Rolling Force ◽  
Element Model ◽  
Work Roll ◽  
Rolling Process ◽  
Thin Strip ◽  
Asymmetric Rolling ◽  
Element Analysis

Cold rolled thin strip has received a great deal of attention through technological and theoretical progress in the rolling process, as well as from researchers who have focused on some essential parameters of strip such as its shape and profile. This paper describes the development of a 3-D finite element model of the shape of thin strip during cold rolling to simulate the cold rolling of WCS (work roll crossing and shifting) in asymmetric rolling. This finite element model considers the asymmetrical rolling parameters such as variations in the diameters of the rolls and the crossing angle as the work roll shifts on the strip during cold rolling. The shape and profile of the strip are discussed in the asymmetrical and symmetrical rolling conditions, while the total rolling force and distribution of stress are discussed in the case where the roll cross angle and axial shifting roll changes. The results can then be used to control the shape and profile of thin strip during rolling.

Determining and Optimizing of Guide Rolls Motion Track in Cold Ring Rolling Process

2006 ◽  
Vol 532-533 ◽  
pp. 141-144 ◽  
Author(s):  
Zhi Chao Sun ◽  
He Yang ◽  
Lan Yun Li
Keyword(s):  
Functional Relationship ◽  
Rolling Force ◽  
Rolling Process ◽  
Initial Position ◽  
Ring Rolling ◽  
Software Environment ◽  
Cold Ring Rolling ◽  
The Stability ◽  
Ring Rolling Process ◽  
And Control

Guide rolls play an important role in controlling both the ring circularity and the stability of cold ring rolling process. However, it is difficult to predict and control the motion of the guide rolls due to the complexity of process associated with the coupled effects of multi-factors. In this paper, a reasonable controlling model of the guide rolls is proposed, and the functional relationship between the motion track of the guide rolls and their setup parameters and process ones is established, by which the guide rolls motion track can be determined. On this basis, a 3D-FE simulation model for cold ring rolling is developed under the ABAQUS software environment and the effects of the initial position and motion track of the guide rolls on the forming stability, ring circularity, rolling force, and oscillating are investigated. Taking the forming stability and ring circularity as objects, the optimum initial position and motion track of the guide rolls are obtained.

An Upper Bound Analysis of the Ring Rolling Process

2011 ◽  
Vol 383-390 ◽  
pp. 2819-2826
Author(s):  
Ali Parvizi ◽  
Karen Abrinia
Keyword(s):  
Upper Bound ◽  
Rolling Force ◽  
Rolling Process ◽  
Neutral Point ◽  
Ring Rolling ◽  
Point Position ◽  
Definition Of ◽  
New Formulation ◽  
Ring Rolling Process ◽  
Bound Analysis

A generalized upper bound solution for the deformation of ring in the ring rolling process has been formulated. An admissible velocity field and strain rates are derived from the parametric definition of streamlines in the deformation zone. This new formulation was used to predict the upper bound on power. Minimizing the upper bound power with respect to neutral point position, the neutral point position and the rolling force were determined. Using the theory presented here, the variation of internal, shear, frictional and total powers with respect to ring revolution are discussed. Some of the results obtained from analysis were compared with experimental results.

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