Mathematical definition of the 3D strain field of the ring in the radial-axial ring rolling process

Quagliato, Luca; Berti, Guido

doi:10.1016/j.ijmecsci.2016.07.009

Cited by 34 publications

(20 citation statements)

References 20 publications

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“…To determine the critical damage value with the proposed rotary compression in cavity test, this process must be numerically modelled by the finite element method. The present analysis is performed with the use of the Simufact.Forming simulation software which was effectively used in previous studies into processes such as cross wedge rolling [43][44][45], Mannesmann piercing [30,46,47], helical rolling of balls [48][49][50], three-roll skew rolling [35,51,52] and other rolling processes [53][54][55][56][57]. performed under laboratory conditions.…”

Section: Fem Analysismentioning

confidence: 99%

Rotary compression in tool cavity—a new ductile fracture calibration test

Pater

Tomczak

Bulzak

et al. 2020

Int J Adv Manuf Technol

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Ductile fracture is one of the most common failure modes in hot metal forming. It can be predicted by means of so-called damage functions that describe the relation between stress, deformation and fracture initiation. A practical use of these functions requires the knowledge of the critical damage value of the material that is determined by calibration tests based on compression, tension and torsion. For the prediction to be correct, one must ensure that the modelled and real stresses are in agreement. Previous studies did not offer any effective test for determining critical values of damage under changing load conditions that occur in cross and skew rolling processes, among others. To compensate for this knowledge gap, researchers at the Lublin University of Technology have developed a new test consisting in rotary compression of a test-piece in a cavity between the tools, which is described in this paper. In the proposed test, a cylindrical test-piece is rolled over a cavity (impression) created by grooves on two mating tools. The cavity height is smaller than the test-piece diameter. At the critical value of the forming length, the state of stress induced thereby in the test-piece axis causes fracture. Knowing the critical forming length, it is possible to determine the critical value of damage by numerical modelling. The practical application of the proposed test is illustrated through the case of C45 grade steel subjected to forming in the temperature range 950-1150°C. The analysis makes use of the normalized Cockcroft-Latham (NCL) criterion of ductile fracture.

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Section: Fem Analysismentioning

confidence: 99%

Rotary compression in tool cavity—a new ductile fracture calibration test

Pater

Tomczak

Bulzak

et al. 2020

Int J Adv Manuf Technol

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“…Ring rolling machines are also used in producing solid wheels and wheel disks for high-speed trains, locomotives, railway carriages, trams, and subway trains. More examples of the varied uses of ring rolling items includes bevel gear and axle drive wheels for the automotive industry, transmission manufacturing, turbine manufacturing (turbine disks for plane propulsion engines), flanges in the computer and plant construction industry, rings for tower flanges (in off-shore wind turbines) and roller bearings (cold spinning) [9].…”

Section: Typical Ring Rolling Productsmentioning

confidence: 99%

“…Kalpak Jian and Schmidt's flat rolling analysis is extended to the process of ring rolling [9]. Process parameters are defined as given in Figure 3.…”

Section: Analytical Description Of Ring Rollingmentioning

confidence: 99%

Simulation and Optimization Studies on the Ring Rolling Process Using Steel and Aluminum Alloys

Teja¹,

Kumar²,

Krishna³

et al. 2019

JES

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The current research was carried out using ANSYS to optimize the process parameters for the ring rolling process. In order to optimize the ring rolling process, parameters such as speed, axial roller feed, and driving rollers have been assessed. As a process optimization approach, the optimum values of the parameters and their relationships need to be evaluated. The stress and strain levels were evaluated at various speeds and forces and the critical failure values were determined. The structural steel and aluminum alloys were chosen for this research because they are used as a roller and job part components in the solid wheels for locomotive applications, respectively. The study was conducted by varying the guide roller’s angular velocity from 40 to 45 rad/sec and varying the work piece’s angular velocity from 200 to 250 rad/sec. Additionally, the work part and roller’s fatigue strengths were determined based on the number of cycles before failure. To evaluate the stresses of plastic strain and von failures, the full stress analysis was also performed. Keywords: roller, ANSYS, workpiece, plastic strain, von Misses stress, metal alloy.

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“…Thus, article [3] investigates the influence of friction on the process of unrolling a cylindrical bearing, but thermal effects are not considered. Paper [4] presents a model of sliding lines to evaluate a temperature effect on the growth of grains in the formation of bearing rings. The same model is employed in [5], however, the impact of characteristics of the machining tools on a change in the macrostructure was not analyzed in the given papers.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%