Fe Simulation of Center Crack Occurrence in Tube Rounds During Two-Roll Rotary Rolling Process

Li, S.Z.; Xu, Jie; Yin, Yuan De; Xue, Jing; Pan, Fu Sheng; Jian, Zeng; Yoon, Jeong Hyun

doi:10.1016/s1006-7191(07)60030-1

Cited by 6 publications

(3 citation statements)

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“…Inner surface crack and inside bore defects of pierced shell have been mostly investigated during rotary piercing process in previous research [3][4][5][6]. The characteristics and forming process of lamination defect of pierced shell were investigated by experimental method in piercing small caliber iron and nickel base alloys, and the influence of roll rotational speed on shell quality pierced by rotary piercing process was qualitatively studied [7,8].However, lamination defect has been little investigated in piercing less-deformable steel and alloy steel pipes, especially in piercing large diameter heavy wall pipes, which is the major quality defect as occurring in the cone-type piercing process.…”

Section: Introductionmentioning

confidence: 99%

Influence of Roll Rotational Speed on inside Bore and Lamination Defects in Rotary Piercing Large Diameter Heavy Wall P92 Steel Pipe Process

Yin

Wang

et al. 2013

AMM

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To investigate the influence of different roll rotational speeds on tendency of inside bore and lamination defects of large diameter heavy wall seamless P92 (9Cr-0.5Mo-1.8WVNb) steel pipe pierced by two-high rotary piercing process, with the aid of commercial FE code MSC. SuperForm, 3D thermo-mechanical coupled simulations were presented. The damage field of the rolled piece during rotary piercing process, and the tendency of forming inside bore and lamination defects were analyzed using Oyane ductile fracture criterion. The results show that When roll rotational speed increases from 7rpm to 11rpm, the maximal damage characteristic value decreases from 0.4279 to 0.3340 in center area of rolled piece in front of the plug, but which increases from 0.3780 to 0.4858 in a certain depth zone (15~25mm) adjacent to the internal surface of the rolled piece contacting with the front end of the plug. With the increase of roll rotational speed, the tendency of forming inside bore defects of rolled piece reduces, but the tendency of forming lamination defects increases. Therefore, there exists a critical roll rotational speed to make the tendency of both inside bore and lamination defects reduce. This study provides scientific basis for formulating reasonable rotational speed schedule to prevent or reduce inner overlap and lamination defects.

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Section: Introductionmentioning

confidence: 99%

Influence of Roll Rotational Speed on inside Bore and Lamination Defects in Rotary Piercing Large Diameter Heavy Wall P92 Steel Pipe Process

Yin

Wang

et al. 2013

AMM

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“…Li Shengzhi in paper [4] showed a 2-D coupled thermal-mechanical simulation of center-crack occurrence during 2-roll rotary rolling process assisted by FE code MSC.SuperForm, and obtained the critical percentage of diameter reduction by comparing the simulation results with experimental data.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Performance Characteristic of Novel Fomichev Plug Used in Cone-Roll Piercer

Ding

et al. 2010

AMR

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The Fomichev plug is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing. This paper introduces the design of a novel Fomichev plug based upon the analysis of roll opening, taking into account for both feed angle and toe angle of a cone type piercer, then presents a 3-D coupled thermo-mechanical simulation of the novel Fomichev Plug’s performance characteristic during cone-roll piercing process, with the aid of FE code MSC.SuperForm. In comparison with conventional plugs, as FEM simulation result shows that the new plug makes the metal deformation distribute uniformly along its perforation section, which brings about well-distributed plug wear. The novel Fomichev plug is able to decrease the slip between the roll and workpiece and avoid rolling block owing to its smaller plug force, which can increase piercing efficiency so, moreover, analyzing stress distribution, it’s more suitable for metal deformation with fewer defects in tube piercing, makes resistance to metal elongation smaller, reduces wedge cleaving to tube billet, and prevents lamination defects during piercing high-alloy billet.

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“…Berazategui et al [3], and Z. Pater et al [4] have tried modelling of the piercing process with three-dimensional FEM, and the effects of rolling parameters on various rolling properties such as the roll force, the equivalent strain and temprature distribution were investigated. Using FEM and Oyane ductile fracture criteria, the center-crack occurrence in round billet during 2-roll rotary rolling process was simulated in literature [5]. Experimental results also showed that the material deforms highly heterogeneously in the cross-roll piercing process [6].…”

Section: Introductionmentioning

confidence: 99%

A Study of Formation Mechanism of the Spiral Mark Defect in Cone-Type Rotary Piercing Process

Huang

Wang

2009

AMM

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The spiral mark is one of the quality defects on the tube surface in cone-type rotary pericing process. In this paper, the numerical simulation study was carried out for cone-type rotary piercing process using rigid-plastic finite element method. From the simulation results, the axial load applied on piercing plug and mandrel bar were then obtained. Taking the elastic deformation of mandrel bar into consideration, the variation of plug location under axial load during pericing process and the non-homogeneous wall thickness were investigated. The formation mechanism of the spiral mark on the tube surface can be found in the obtained results.

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Fe Simulation of Center Crack Occurrence in Tube Rounds During Two-Roll Rotary Rolling Process

Cited by 6 publications

References 0 publications

Influence of Roll Rotational Speed on inside Bore and Lamination Defects in Rotary Piercing Large Diameter Heavy Wall P92 Steel Pipe Process

Influence of Roll Rotational Speed on inside Bore and Lamination Defects in Rotary Piercing Large Diameter Heavy Wall P92 Steel Pipe Process

Numerical Simulation on Performance Characteristic of Novel Fomichev Plug Used in Cone-Roll Piercer

A Study of Formation Mechanism of the Spiral Mark Defect in Cone-Type Rotary Piercing Process

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