In this article, an analytic solution for ring rolling process based on the sstone method theory is presented, in which the non-uniformity of the normal and shear stresses across the section of the Sstone Analysis of Ring Rolling Assuming Constant Shear Friction | SpringerLink

In a more recent work, Parvizi et al [5] proposed a Sstone analysis for the determination of both load and torque in the ring rolling process but, based on the results presented in the paper, the model tends to underestimate both of them in case the mean radius of the ring is greater than 160 mm or in case of thickness reduction smaller than 40%

Sstone Analysis of Ring Rolling Assuming Constant Shear Friction A Parvizi, K Abrinia, and M Salimi (Submitted October 3, 2009; in revised form October 30, 2010) In this article, an analytic solution for ring rolling process based on the sstone method theory is presented, in

In this paper, based on the modified sstone method theory, an analytical solution for ring rolling process is presented The non-uniformity of the normal and shear stresses across the section of the

In this paper, based on the modified sstone method theory, an analytical solution for ring rolling process is presented The non-uniformity of the normal and shear stresses across the section of the deforming material are considered

Sstone analysis of large cylindrical shell rolling considering mixed friction Abstract Large cylindrical shell rolling is an advanced plastic-forming technique that has unequal speed and radius of both its upper and lower rolls A theoretical model for a large cylindrical shell rolling that is based on the sstone method is proposed,

Over the years, some analytical, physical and numerical modeling methods including experimental formulae , slip line fields method , , sstone method and FE analysis are used by many researchers to predict the final results of ring rolling processes But, because of some difficulties in the ring rolling process including the unsteady state nature of the process (being time dependent), the continuously …

Flat Rolling Analysis Results – without front and back tension p p µp µp σ σ x x + dσ x Stresses on Sstone in Entry Zone Stresses on Sstone in Exit Zone p p µp µp σ σ x x + dσ x Using sstone analysis we can derive roll pressure distributions for the entry and exit zones as: h 0 and h b are the same thing 2tan1 ff RR H hh − φ = ()0 0 2 3 H H f h pYe h

Ring rolling is a specialized type of hot rolling that increases the diameter of a ring The starting material is a thick-walled ring This workpiece is placed between two rolls, an inner idler roll and a driven roll, which presses the ring from the outside As the rolling occurs the wall thickness decreases as the diameter increases

conditions The sstone method has been applied widely to various plane strain or axisymmetric forming problems such as upsetting, extrusion, drawing, and rolling Figure 1 illustrates a simple example of the sstone method applied to a ring compression prob-lem In fact, the ring compression test has been used widely as a convenient tool to evaluate the

conditions The sstone method has been applied widely to various plane strain or axisymmetric forming problems such as upsetting, extrusion, drawing, and rolling Figure 1 illustrates a simple example of the sstone method applied to a ring compression prob-lem In fact, the ring compression test has been used widely as a convenient tool to evaluate the

In this paper, a theoretical model based on sstone method of analysis for plane strain asymmetrical rolling is presented In this model the non-uniformity of the normal and shear stresses in deriving of the governing equations are considered This model can predict the required external loading to the plate at entry to keep the plate horizontal

Smaller diameter, thicker ring can be enlarged to larger diameter, thinner section by ring rolling In this process, two circular rolls, one of which is idler roll and the other is driven roll are used A pair of edging rollers are used for maintaining the height constant The ring is rotated and the rings are moved closer to each other, thereby reducing the thickness of ring and increasing its diameter Rings of different cross …

52 Flat rolling and its analysis: Flat rolling is illustrated in Figures (5-1) It involves the rolling of slabs, strips, sheets, and plates workparts of rectangular cross section in which the width is greater than the thickness In flat rolling, the work is squeezed between two rolls so that its thickness is reduced by an amount called the draft:

Feb 01, 2014 · Sstone analysis of ring rolling assuming constant shear friction Parvizi, A; Abrinia, K; Salimi, M A practical method for finite element ring rolling simulation using the ALE flow formulation

Sstone Method Introduction – experimental characterization of friction (ring compression test) Friction can be determined by means of the ring compression test During ring compression the variation of the inner di ameter is sensitive to friction at the contact interface between th e material and platens

Blooms typically have a square cross section of greater than 6x6 inches Slabs are rectangular and are usually greater than 10 inches in width and more than 15 inches in thickness Rolling is most often, (particularly in the case of the conversion of an ingot or continuous casting), performed hot

Sstone method is a simple analytical procedure based on principles of mechanics We can assume a simple relation between forming load and material flow stress in the form: F = k A, where k is an empirically determined constant which takes into account friction, redundant deformation etc

Abstract: Based on analyzing the stress-strain characters of material in nosing deformation zone, and considering two influencing factors, ie material thickness variation and material work-hardening, according to ignoring and considering the influence of additional bending stress at the entrance of die, and the different forms of work-hardening of metal materials, a new set of mathematical models of …

Sstone analysis assumptions • Entire forging is stone – no elasticity • Material is perfectly stone – strain hardening and strain rate effects later • Friction coefficient (µ) is constant – all sliding, to start • Plane strain – no z-direction deformation • In any thin slab, stresses are uniform

Module „Rolling“ in Simufact Forming Today, numerical simulation of rolling is a fixture in a CAE-based development environment Simufact Forming unites simple and intuitive usability with reliable predictions of rolling processes The simulation’s results find their application not only in the development of products and processes,

Abstract—The rolling process of precision profile used for piston ring is simulated by large general-purpose explicit dynamic finite element analysis software ANSYS/LS_DYNA The modeling of finite element models, the selection of material models and element types, the meshing of the model are introduced in detail The rolling metal flow rulers

1Analysis of strip rolling- 2: 11 Simplified analysis: The parameters which influence the rolling process are: roll diameter, friction, material flow stress, temperature of working etc Without considering friction, we can get the rolling load, approximately, from the material flow stress and …

ACKNOWLEDGEMENTS Thismanualhasbeenpreparedwithinformationandassistance fromTheAluminumAssociationandmembercompaniesrepresented ontheSheetandPlateDivision

Sstone Analysis of Ring Rolling AssumingConstantShearFriction - Download as PDF File (pdf), Text File (txt) or read online ring rolling, sstone analisys

Ring rolling is a specialized type of hot rolling that increases the diameter of a ring The starting material is a thick-walled ring This workpiece is placed between two rolls, an inner idler roll and a driven roll, which presses the ring from the outside As the rolling occurs the wall thickness decreases as …

Jan 14, 2013 · Rolling Process SEMI FINISHEDPRODUCTS TERMINOLOGY Bloom is the product of first breakdown of ingot (cross sectional area > 230 cm2) Billet is the product obtained from a further reduction by hot rolling (cross sectional area > 40x40 mm2)Sstone is the hot rolled ingot (cross sectional area > 100 cm2 and witha width ≥ 2 x thickness)

Abstract—The rolling process of precision profile used for piston ring is simulated by large general-purpose explicit dynamic finite element analysis software ANSYS/LS_DYNA The modeling of finite element models, the selection of material models and element types, the meshing of the model are introduced in detail The rolling metal flow rulers

roll diameter (DW ) is 1150 mm, the sstone thickness before During hot rolling, the heat transfer between the sstone rolling (H0 ) is 250 mm, and the sstone thickness after rolling surface and the external environment take place in two (H1 ) is 230 mm

Fog on the Barrow Downs When he wakes up, he finds himself on a sstone of rock, laid out with his hands folded on his chest He genuinely believes that he is going to die, but that thought gives him surprising …

The basic use of hot rolling mills is to shape up the larger pieces of billets and slabs into narrow and desired forms These metal pieces are heated over their re crystallization temperature and are then moved between the rollers so as to form thinner cross sections

approximate results (but showed correct trends in all cases) For the case of ring compression tests, it has been shown that the sstone method produces good results when compared with those obtained from FE and experiments [3] In this research, the accuracy of the sstone method for the upset forging of a cylindrical billet was investigated

Investigation of a sstone method analysis and FEM simulation on rotating compression forming of ring Gow-Yi Tzoua, Hung-Hsiou Hsub,∗, Yun-Hsiu Hsiaoa a Department of Mechanical Engineering, Yung-Ta Institute of Technology, Pingtung 909, Taiwan, ROC b Department of Management Information Science, Institute of Health Information Management,

The natural continuation of the discussion is the solute rich region found between the solute depleted center and the rolling face, seen in red in Figure 14 The Y coordinate from the previous analysis marks the end of the solute depleted center as we move towards the rolling face

Jul 26, 2007 · This feature is not available right now Please try again later

then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process The Hot Mill rolls slabs weighing up to 30 tons between 30” and 74” Steel sstone 8 to 9 inches thick and up to 36

The sstone analysis is based on making a force balance on a differentially thick sstone of material It is useful in estimating the role of friction on forces required in drawing, extrusion and rolling The important assumptions are: 1 The principal

Analysis The design of a floor slab-on-grade in-volves the interaction of a concrete sstone and a soil support system The concrete is a material considered to be heteroge-neous and statistically isotropic, becom-ing orthotropic with the development of micro-cracks Concrete strength in

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