A new ductile fracture criterion for skew rolling and its application to evaluate the effect of number of rolls

Yamane, Koji; Shimoda, Kazuhiro; Kuroda, Koichi; Kajikawa, Shohei; Kuboki, Takashi

doi:10.1016/j.jmatprotec.2020.116989

Cited by 16 publications

(7 citation statements)

References 30 publications

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“…Skripalenko et al [22] found that in two-roll CWR material fracture occurred along the axis of the workpiece, whereas in three-roll CWR the cracks were ring-shaped. This finding was confirmed by Yamane et al [23]. Pater et al [24] used FEM to compare the stress states in twoand three-roll skew rolling processes.…”

Section: Introductionmentioning

confidence: 53%

A Comparison of Two-Roll and Three-Roll Cross Wedge Rolling Processes

Pater¹

2023

Adv. Sci. Technol. Res. J.

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Cross wedge rolling (CWR) is used for producing stepped axles and shafts as well as die forging preforms. In current industrial practice, CWR conducted with two tools is predominantly used, with the wedges mounted on rolls or flat tool plates. However, CWR can also be performed with the use of three wedge rolls. This paper begins with a review of previous studies on CWR conducted with the use of three rolls. After that, numerical simulations of two-and three-roll CWR processes for the same shaft are described. Obtained numerical results are then used to compare the two processes in terms of material flow kinematics, material temperature, stresses and strains, failure modes, as well as load and energy parameters. Finally, the Conclusions section presents the advantages of threeroll cross wedge rolling, providing a good starting point for further research on this promising forming method.

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Section: Introductionmentioning

confidence: 53%

A Comparison of Two-Roll and Three-Roll Cross Wedge Rolling Processes

Pater¹

2023

Adv. Sci. Technol. Res. J.

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“…One of the limitations to the skew rolling processes is the occurrence of cracks inside the rolled parts [20,21]. The crack occurrence may be monitored by controlling the values of the so-called damage function.…”

Section: Obtained Resultsmentioning

confidence: 99%

Conception of Hollow Axles Forming by Skew Rolling with Moving Mandrel

Pater¹,

Walczuk-Gągała²

2021

Adv. Sci. Technol. Res. J.

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The article presents a conception of manufacturing a hollow axle using three skewed rolls moving at the same rotating speed, axially moving chuck and a moving mandrel. The outer shape of the axle is obtained as a result of combining the radial feed of the rolls with axial feed of the chuck. The hole in the axle, however, is obtained as a result of the mandrel acting on the workpiece while moving along with it. In order to assess the correctness of the presented concept of forming, a numerical simulation was performed in Simufact. Forming commercial software. The results of the simulation confirmed that the applied method allows one to manufacture large-size hollow axles. Moreover, information on force parameters of the forming process, which can be used for designing an industrial rolling mill was obtained.

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“…A serious limitation of skew rolling processes is material cracking in the form of longitudinal grooves, their shape depending on the number of rolls [34]. Material cracking in forming processes is modelled using different fracture criteria, the most frequently employed one being the normalized Cockcroft-Latham criterion (NCL).…”

Section: Numerical Analysismentioning

confidence: 99%

Numerical and experimental study on forming preforms in a CNC skew rolling mill

Pater

Tomczak

Bulzak

et al. 2022

Archiv.Civ.Mech.Eng

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This paper relates to a study on the formation of elongated preforms in a CNC skew rolling mill. First, a numerical analysis was performed to investigate forming processes for three different parts: a scraper, a connecting rod, and a hook. The shapes and dimensions of preforms were designed, and rolling and closed-died forging processes for producing these parts were simulated numerically. Distributions of temperature, effective strain and damage function were determined for rolled preforms. Loads and torques in the rolling process were measured. It was found that the forming process of preforms performed in a CNC skew rolling mill was characterized by relatively low force parameters in relation to the dimensions of formed parts. Numerical simulations of the forging process showed that all forged parts had the required shape, which indicates that the preforms were designed correctly. Following the numerical analysis, experiments were performed in which the preforms were rolled under laboratory conditions (in a scale of 1:2). Experimental results demonstrated that the rolled parts had no internal defects (cracks) and were characterized by high dimensional accuracy.

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A new ductile fracture criterion for skew rolling and its application to evaluate the effect of number of rolls

Cited by 16 publications

References 30 publications

A Comparison of Two-Roll and Three-Roll Cross Wedge Rolling Processes

A Comparison of Two-Roll and Three-Roll Cross Wedge Rolling Processes

Conception of Hollow Axles Forming by Skew Rolling with Moving Mandrel

Numerical and experimental study on forming preforms in a CNC skew rolling mill

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