Comparative Analysis of Tube Piercing Processes in the Two-Roll and Three-Roll Mills

Pater, Z.; Wójcik, Łukasz; Walczuk, Patrycja

doi:10.12913/22998624/102766

Cited by 12 publications

(11 citation statements)

References 15 publications

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“…The estimation of SSS at RSR is currently realized using a finite element method (FEM) of computer simulation. Piercing by the Diesher mill (a two-roll screw rolling mill with guiding discs) was investigated in [16] with the help of computer simulation that showed a difference in SSS for two- and three-high screw piercing [17]. The research of stationary and non-stationary stages of three-high RSR using the DEFORM software was carried out in [18].…”

Section: Introductionmentioning

confidence: 99%

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Skripalenko

Галкин

Karpov³

et al. 2019

Materials

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Radial-shear rolling (RSR) of titanium alloy billets was realized in a three-high rolling mill. Experimental rolling was simulated using DEFORM software. The purpose was to reveal how stress-strain state parameters, grain structure and hardness vary along the billet’s radius in the stationary stage of the RSR process. It was also the goal to establish a relation between stress state parameters, hardness and grain structure. Changes in the accumulated strain and the stress triaxiality were established by computer simulation. Hardness and grain size changes were obtained after experimental rolling. The novelty aspect is that both computer simulation and experimental rolling showed that there is a ring-shape area with lowered strength in the billet’s cross-section. The radius of the ring-shape area was predicted as a result of the research.

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Section: Introductionmentioning

confidence: 99%

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Skripalenko

Галкин

Karpov³

et al. 2019

Materials

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“…This mainly results from the fact that skew rolling is less efficient than longitudinal rolling; it is characterized by faster tool wear and the risk of cavity formation in the center of the cylindrical billet (the so-called Mannesmann effect) [13]. As a result, this method is primarily employed in the production of seamless tubes [14], in which skew rolling mills are used for piercing [15] as well as diameter reduction and elongation [16]. Skew rolling processes are predominantly used for rolling bars from hard-to-deform materials such as alloys of titanium [17,18], nickel, and magnesium [19].…”

Section: Introductionmentioning

confidence: 99%

Skew Rolling of Rods from Scrap Rail Heads

2019

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This paper presents the results of theoretical and experimental investigations of a new process of rolling rods from scrap rail heads. First, the industrial applications of scrap railway rails and methods of their recycling are discussed, and then the concept of two-stage rolling of rods from heads cut off from scrap rails is proposed. In the first stage of the process, a rail head preform was rolled in a hexagonal pass of a longitudinal rolling mill. Then in the second stage, the hexagonal bar was skew rolled into a rod in a helical roll pass. Theoretical considerations were based on finite element numerical modelling. The rolling process was simulated under 3D deformation using Forge NxT v.1.1 software developed by Transvalor Company. Calculations were carried out to determine the material flow kinematics, strength, and thermal parameters of the process and to identify the phenomena that might constrain its implementation. The numerical results were verified in experimental tests, during which preforms and rods were formed from scrap rail heads. The tests were conducted in longitudinal and skew rolling mills. The results indicate that rods can be effectively formed from scrap rail heads in just two steps. Rods obtained using the proposed method can be used as full-featured, semifinished products for the manufacture of various types of machine parts.

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“…The material properties are as follows in Supplementary table 3. Equation ( 1) described the behavior of flow stress in viscoplastic material as follows 13 r f ¼ 2707:11 e À0:00325T e À0:13502 e 0:05494=e _ e 0:1529…”

Section: Fainant Element Methods and Materialsmentioning

confidence: 99%

“…As a result, they claimed the shear strain can describe more accurate the shear deformation of seamless tube regards to features of the piercing process and measuring the created twist angle of the tube within the process. Pater et al 12,13 presented an investigation comparing Discher rollers in the piercing process. Therefore, using the different number of rollers, temperature distribution, strain, stress and other parameters were obtained for the two models.…”

Section: Introductionmentioning

confidence: 99%

Study of the rollers geometry effects in rotary tube piercing and wear analyses of mandrel according to the finite element method

Darki

Raskatov

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The rotary tube piercing (RTP) is the first process of making the seamless tube after producing the desired alloy ingot. There are several approaches to manufacture a seamless tube, but one of the most common types is RTP. This approach covers a wide range of processes that are categorized according to the number and shape of the rollers. On the other hand, each of these types has designed guides in the output and input of the piercing process. In this paper, a new design of the input guide for four types of rollers have been examined and simulated. Thus, four specimens including Diescher and Conical rollers were considered, with the different number of rollers. Results including torque, total force, mandrel wear, temperature distribution, and strain were extracted using FEM simulation. In order to the validation of simulation, the total force and oscillations of applied force within the process have been compared with the experimental results. The results obtained through this simulation, are more in line with the empirical results obtained from previous research. As well as, the FEM simulation confirmed the performance accuracy of the output and input guides of the RTP process. On the other hand, the results indicate that the three-roller Diescher type with 17° feed angle, has the most suitable arrangement for production of seamless tube.

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Comparative Analysis of Tube Piercing Processes in the Two-Roll and Three-Roll Mills

Cited by 12 publications

References 15 publications

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Skew Rolling of Rods from Scrap Rail Heads

Study of the rollers geometry effects in rotary tube piercing and wear analyses of mandrel according to the finite element method

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