Combined Methods for the Prediction of Dynamic Instabilities in Sheet Metal Spinning

Kleiner, Matthias; Göbel, R.; Kantz, Holger; Klimmek, Ch.; Homberg, Werner

doi:10.1016/s0007-8506(07)61501-7

Cited by 47 publications

(42 citation statements)

References 2 publications

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“…As shown in Table 5, the feed ratio limit increases when using thicker metal sheets. It suggests that the thicker the metal sheet, the higher capability to stand the wrinkling failure, as also claimed by Kleiner et al [2] and Xia et al [16]. …”

Section: Page 19supporting

confidence: 60%

“…These sudden changes and fluctuations of tool forces may be resulted from the existing wrinkles on the workpiece interacting with the roller. As shown in Figure 17, wrinkling failure initiates at 0.34 s and is extending to the whole flange around 0.36 s. Consequently it is considered that these sudden changes and fluctuations in tool forces may be used to determine the moment when wrinkling occurs, as also reported by Kleiner et al [2], Arai [18], Hayama [19], Finckenstein and Dierig [23].…”

Section: Page 20mentioning

confidence: 68%

“…The mass scaling technique, which artificially increases the density of the material, is commonly used to speed up the analysis. According to equation (7) - (9), by increasing the mass density by a factor of f 2 , the number of the time increment will decrease by a factor of f. However, if a massive speed-up factor is applied, the corresponding inertial forces will affect the mechanical response and produce unrealistic dynamic results.…”

Section: Solution Methodsmentioning

confidence: 99%

“…Kleiner et al [2] suggested that the wrinkling in the spinning process was not only caused by static buckling but also influenced or even triggered by the dynamic effects from the feeding of roller and the rotation of workpiece.…”

Section: Introductionmentioning

confidence: 99%

“…Based on FE analysis results, Sebastiani et al [4] found a toothed stress pattern after a backward roller pass and the authors believed that it was a pre-state leading to the wrinkling failure. In addition, effects of process parameters on the wrinkling in the spinning process have been studied by the following researchers: Kleiner et al [2] concluded that in the conventional spinning the diameter and thickness of the workpiece had the most significant effects on the wrinkling failure. Hayama et al [5] reported that the feed ratio, sheet thickness and diameter were very important factors for the wrinkling in shear forming process.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of the roller feed ratio on wrinkling failure in conventional spinning of a cylindrical cup

Wang

Long

Ashley³

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this study, wrinkling failure in conventional spinning of a cylindrical cup has been investigated by using both Finite Element (FE) analysis and experimental methods. FE simulation models of a spinning experiment have been developed using the explicit finite element solution method provided by software Abaqus. The severity of wrinkles is quantified by calculating the standard deviation of the radial coordinates of element nodes on the edge of the workpiece obtained from the FE models. The results show that the severity of wrinkles tends to increase when increasing the roller feed ratio. A forming limit study for wrinkling has been carried out and it shows there is a feed ratio limit beyond which the wrinkling failure will take place. Provided that the feed ratio is kept below this limit, the wrinkling failure can be prevented. It is believed that high compressive tangential stresses in the local forming zone are the causes of the wrinkling failure. Furthermore, the computational performance of the solid and shell elements in simulating the spinning process are examined, the tool forces obtained from wrinkling and wrinkle-free models are compared. Finally the effects of the feed ratio on variations of the wall thickness of the spun cylindrical cup are investigated.

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Section: Page 19supporting

confidence: 60%

Section: Page 20mentioning

confidence: 68%

Section: Solution Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the roller feed ratio on wrinkling failure in conventional spinning of a cylindrical cup

Wang

Long

Ashley³

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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Comparison of multivariate methods for robust parameter design in sheet metal spinning

Auer

Erdbrügge

Göbel

2004

Appl Stoch Models Bus & Ind

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SUMMARYSheet metal spinning is a very complex forming process with a large number of quality characteristics. Within the scope of a joint project of the Department of Statistics and the Chair of Forming Technology the impact of process parameters (design factors) on important quality characteristics has been investigated both theoretically and experimentally. In the past, every response has been treated individually and uncontrollable disturbances (noise factors) have been neglected. Now this approach has been extended to robust multiresponse parameter design. For this, a review of common multivariate approaches for robust parameter design has been carried out, which also leads to the proposal of some new variants. In addition to the theoretical comparison, the methods were applied to data gained in the sheet metal spinning process. The obtained results were evaluated in terms of applicability, limitations and quality accuracy. Practical experiments confirmed the high degree of efficiency that the finally proposed method based on desirabilities promises.

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Simulation der geometrischen Oberflächen‐ wandlung beim Drücken optischer Bauteile

Groche

Schäfer

2004

Materialwissenschaft Werkst

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Simulation of the surface roughness alteration in spinning of optical components Forming technology is often used to manufacture work pieces with sophisticated surface topology as well as part shapes. Today, the production of the required surface qualities is still based on expert knowledge and "trial and error" techniques. Thus, in this paper an approach will be shown to compute surface quality by finite element analysis.

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Combined Methods for the Prediction of Dynamic Instabilities in Sheet Metal Spinning

Cited by 47 publications

References 2 publications

Effects of the roller feed ratio on wrinkling failure in conventional spinning of a cylindrical cup

Effects of the roller feed ratio on wrinkling failure in conventional spinning of a cylindrical cup

Comparison of multivariate methods for robust parameter design in sheet metal spinning

Simulation der geometrischen Oberflächen‐ wandlung beim Drücken optischer Bauteile

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