Dynamic friction model and its application in flat rolling

Tan, Xiao; Yan, Xiu-Tian; Juster, Neal P.; Raghunathan, Srinivasan; Wang, Jian

doi:10.1016/j.jmatprotec.2007.12.080

Cited by 29 publications

(10 citation statements)

References 24 publications

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“…So its online application in industrial fields was restricted . Tan proposed a dynamic friction model which could lead to a better solution of the contact stress at the neutral plane, but four relative factors and two fractional factors limited its application in strip rolling due to the difficulty of parameter identification …”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics Method and Its Application in Hot Strip Rolling

Wang

Ruan

et al. 2016

steel research int.

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A hydrodynamics method (HM) has been developed to predict the contact stresses in hot strip rolling. This method is based on that materials deformed in hot rolling present properties of viscous fluid. The contact stress formulas are derived from Navier–Stokes equation (N‐S equation) by using HM. The contact stresses predicted by these formulas agreed well with the experiment data, which verified the validity of these formulas. By comparisons of experiment data with the results predicted by the derived formulas, the Amontons–Coulomb friction model (ACM) and the Absolute constant friction model (AFM), it is found that formulas derived by HM can smooth the friction hill and has higher accuracy in predicting the neutral plane positon than the ACM and the AFM did. It is believed that the contact stress formulas derived by HM can be used to solve on line hot rolling problems.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamics Method and Its Application in Hot Strip Rolling

Wang

Ruan

et al. 2016

steel research int.

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“…Local friction stress, however, is very hard to be predicted because there are few suitable friction models. The local friction stress distribution along the whole deforming region predicted by current friction models does not fit with or even is opposite to the trend of the experimentally measured data, in particular at the neutral point, for example, in plane strain compression [29], flat rolling [30], and review by Bay and Gerved [31]. Application of the dynamic friction model [29,30] can avoid this problem.…”

Section: Introductionmentioning

confidence: 91%

Evaluation of friction in upsetting

Tan

2010

Prod. Eng. Res. Devel.

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Distributions of contact stresses at the neutral point in metal forming are very hard to be properly predicted due to the complex interface situation and lack of suitable friction models. In this paper, the dynamic friction model in which the friction depends on both time rate of strain and normal pressure has been applied to predict contact stresses in cylinder upsetting. Case studies have shown that the predicted results agreed with the experimental data chosen from literature. By comparing with two other friction models, the dynamic friction model seemed to give a better solution.

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“…着数值计算能力和理论研究方法的发展，轧机振动问题进入新的研究阶段，国内外专家学者针对多模态耦合振动 [9][10][11] 、非线性因素 [12][13][14][15][16] 、塑形变形过程 [17][18] 、界面摩擦与润滑 [19][20] 、连续轧制 [21] 等结构与工艺问题的考虑，从理论分析、数值计算、试验模拟及工程验证等多方面进行了研究，郜志英等 [22] 对近十几年的发展现状进行了详细的综述。 …”

Section: ，普遍认为轧机振动是由于系统结构与轧制过程相互作用所引起的自激振动。近十几年来，随unclassified

Research on Critical Rolling Speed of Self-excited Vibration in the Tandem Rolling Process of Thin Strip

Gao¹

2017

JME

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*Abstract：Rolling mills are typically complicated dynamic systems due to the coupling of structure and technique. Under the feedback excitation of inner sources, self-excited vibration is triggered when driving energy is transformed into vibration energy in structures under certain circumstances. The rolling speed is a direct index for measuring productivity, and also a key factor in triggering instability of rolling machines, therefore a research on the critical rolling speed possesses major significance in the forecast and control of self-excited vibration. Taking into consideration the equivalent elastic-plastic stiffness, an 8-DOF structurally asymmetrical model of a certain 6-roller rolling mill for thin strip is set up. A model of rolling process is established based on the plane strain hypothesis and the SLAB theory, and effectively verified by comparing the calculation value and the actual measurement of the rolling force, furthermore the increment model of rolling parameters is attained by TALOR expanded formula, thus a dynamic model with the coupling of structure and technique is presented. The LAPLACE transform is executed to get the characteristic equation in the S-domain, the instability condition of the system and the rolling speed threshold of the self-excited vibration is obtained by the application of ROUTH stability criterion. The influences of technical parameters are analyzed, and then the ways to the optimization of technical schedules are correspondingly proposed. By combing calculation conclusions with the actual producing problems, the typical vibration phenomenon and the vibration suppressing strategies are simulated during the increasing-speed stage and the steady-speed process respectively, and these problems are demonstrated and explained through the relations between the critical rolling speed and instable self-excited vibration. These results show that as a major index for the evaluation of the vibration and stability of rolling mills, the critical rolling speed can be improved through the optimization of the technical conditions and the distribution of the reduction schedules, thus a high-speed stable rolling process is achieved in the tandem rolling mill of thin strip.

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Dynamic friction model and its application in flat rolling

Cited by 29 publications

References 24 publications

Hydrodynamics Method and Its Application in Hot Strip Rolling

Hydrodynamics Method and Its Application in Hot Strip Rolling

Evaluation of friction in upsetting

Research on Critical Rolling Speed of Self-excited Vibration in the Tandem Rolling Process of Thin Strip

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