An upper bound solution of tube drawing

Um, Kyung-Keun; Lee, Dong Nyung

doi:10.1016/s0924-0136(96)02597-6

Cited by 25 publications

(19 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2006) and mentioned that the modified slab method is useful to predict the behaviour of the high-reduction-ratio drawing process with a floating plug. Um et al (1997) proposed an upper-bound solution for axisymmetric tube drawing through a conical die with a fixed tapered plug. In the present investigations, the same type of die and mandrel was used.…”

Section: Formability Limit Of Aluminium Tube Drawing With Variable Wamentioning

confidence: 99%

“…In the present investigations, the same type of die and mandrel was used. Therefore, the analytical model based on the upper bound methods, obtained by Um et al (1997), is applied. Figure 9.…”

Section: Formability Limit Of Aluminium Tube Drawing With Variable Wamentioning

confidence: 99%

“…These energy dissipation rates were obtained from analytical solutions proposed in Um et al (1997) and presented with more detail in the appendix B: , where m is the partial friction coefficient (0≤m≤1). The partial friction coefficient m, was referred as the frictional shear factor, can take the value m=0 for a frictionless interface and m=1…”

Section: Formability Limit Of Aluminium Tube Drawing With Variable Wamentioning

confidence: 99%

“…An extension of upper bound solution, established by Um et al (1997), is proposed for predicting stress of tube drawing process with variable thickness. The proposed model is combined with critical drawing stress ratio for prediction of the limited values of wall thickness and area reduction of tubes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness

Bui

Bihamta

Guillot

et al. 2011

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness AbstractStructural aluminium tubes have very important industrial applications, particularly in automobile industry. Tube drawing process is wildly used to reduce the outer and inner diameters of tubes. An important issue in the tube drawing process to obtain variable wall thickness is how to determinate and predict its formability limits. Previously published works generally deal with the formability limit of conventional tube drawing based on experimental analysis, analytical method and finite element method. However, in the case of variable wall thickness tubes, there is a lack of knowledge and data in order to predict their limit of formability. In the present study, both theoretical and experimental methods are proposed for estimating the formability limit of the variable wall thickness aluminium tubes used for the transportation purposes. A modification of a conical mandrel was proposed and a special control system for mandrel displacement during the process was used to carry out the drawing tests. During the drawing process, the tube pulling axis was controlled at constant speed while the mandrel was moved to achieve the continuously variable wall thickness. The formability limit in term of minimum wall thickness and maximum area reduction was obtained before tube rupture. These values are useful data for the determination of the extent of deformation during a drawing process that a material can experience without failure. The maximum drawing stress ratio was also determined experimentally. Further, an extension of an upper bound solution developed in previous publications is proposed to predict the drawing stress field. The maximum drawing stress ratio was used as a criterion for fracture analysis. It was shown that the analytical model with its new extension combined to the fracture criterion predicts quite well the thickness and area reduction limit. The experimental studies were completed by examining the microstructure and strain field at the limit state.

show abstract

Section: Formability Limit Of Aluminium Tube Drawing With Variable Wamentioning

confidence: 99%

Section: Formability Limit Of Aluminium Tube Drawing With Variable Wamentioning

confidence: 99%

Section: Formability Limit Of Aluminium Tube Drawing With Variable Wamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness

Bui

Bihamta

Guillot

et al. 2011

Journal of Materials Processing Technology

View full text Add to dashboard Cite

show abstract

“…Keun Um and Nyung Lec obtain the upper bound solution of tube drawing process using a fixed tapered plug, which reduces to a solution for tube sinking by setting friction factor between tube and plug at zero [7].…”

Section: A Cold Drawing Processmentioning

confidence: 99%

A Review on Spring Back and Optimization Process

2018

IJMTER

View full text Add to dashboard Cite

Abstract-Recently forming industries faces spring back drawback in forming process like cold drawing, sheet metal forming, bending etc. These forming process resulted permanent deformation by cold forming to create different shapes. Spring back defect taking place during the forming process has been emphasized. The solution to such defect problems was also given. Literature review shows that considerable amount of researches have been conducted in the field of material forming and spring-back optimization process. The present review focuses on the cold forming processes, spring back defect, factors affecting spring back, the various methods used to analyze and optimize the spring back free process. This review also opens future research work to get dimensional stability and least springback.

show abstract

FEM Numerical Simulation and Experimental Investigation on End-Forming of Thin-Walled Tubes Using a Die

Schaeffer

Brito

2007

steel research international

View full text Add to dashboard Cite

Thin-walled tubes are applied in several industrial areas, as heat exchangers, shock absorbers, preforms to other metal forming processes, etc. In this study an experimental and theoretical investigation is performed involving tube end expansion, reduction and inversion processes using a die. The parameters that govern each process are investigated. A brief description of each process and a summary of the state of art are presented. The material employed in the experimental tests is an AISI 1010 carbon steel and all the work is carried out at room temperature. The theoretical investigation is done using FEM software QFORM 3D, version 4.1.5. In order to feed the software with realistic data stress-strain curves for the material were obtained by means of compression tests and the tribological conditions at the contact interface between the tube and the tools was estimated by means of ring compression method. The investigation on the tube end-forming processes focused mainly on understanding modes of deformation and on establishing formability limits for each of them. The results show that processes for end-forming of thin-walled tubes are successful only within a compact range of process parameters.

show abstract

An upper bound solution of tube drawing

Cited by 25 publications

References 2 publications

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness

A Review on Spring Back and Optimization Process

FEM Numerical Simulation and Experimental Investigation on End-Forming of Thin-Walled Tubes Using a Die

Contact Info

Product

Resources

About