End forming of thin-walled tubes

Alves, M.L.; Almeida, B.P.P.; Rosa, P.A.R.; Martins, P.A.F.

doi:10.1016/j.jmatprotec.2006.04.040

Cited by 71 publications

(27 citation statements)

References 6 publications

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“…The fin combined with the tube was constrained to the upper side (the y-direction in Figure 5). The same expansion ball speed of 90 mm/s as in the actual tube expansion process was applied, along with a friction coefficient of 0.36 between the expansion ball and Cu tube [12].…”

Section: Fe Analysismentioning

confidence: 99%

“…In a numerical study, Lee et al observed that non-uniform height of the tube's inner grooves provided better contact pressure between the tube and fin after expansion [9]. Previous studies also investigated the influence of the slope angle on the expansion force [10] and on the formation of tube creases [11,12]. The effect of the expansion ball curvature on the expansion force and tube's inner groove deformation has also been studied [13,14].…”

Section: Introductionmentioning

confidence: 99%

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The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

et al. 2018

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Abstract:In the expansion process of a fin-tube heat exchanger, the process variables and shape of the expansion ball affect the deformation of the tube's inner grooves, the adhesion, and the expansion force. These factors influence the efficiency of heat transfer and the lifetime of the expansion equipment. Therefore, this study analyzed the influential variables of the tube expansion process as well as the expansion ball design through experiments and simulations. A new method was proposed to determine the severity of adhesion in the tube's inner grooves using the expansion force rate. Expansion experiments with Al tubes show that the expansion force decreases when using a lubricant with high viscosity and when the lubricant remains on the expansion ball for a longer duration. Finite element analysis was also performed to examine the expansion of Cu tubes, which showed that the expansion force was higher when using expansion ball shapes that have higher contact area between the ball and tube surface. The radius of curvature of the expansion ball also influenced the expansion force. However, increasing the ratio of the radial force to the expansion force increased the deformation of the tube's inner grooves.

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Section: Fe Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

et al. 2018

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“…The cold state expansion and reduction of thin-walled PVC tubes using a die was studied by Alves et al [5]. The authors performed the study on PVC tubes.…”

Section: Introductionmentioning

confidence: 99%

Design and Modeling Studies of Tube End Expansion using Response Surface Methodology

L. Venugopal

2018

IJMPERD

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“…• tube-end forming [9], • flange extrusion by an elastic ring [10,11], The paper describes a new method for producing flanges in hollow parts. The method is dedicated to producing flanges whose height is several times larger than workpiece wall thickness.…”

Section: Introductionmentioning

confidence: 99%

Numerical And Experimental Study Of Producing Flanges On Hollow Parts By Extrusion With A Movable Sleeve

Gontarz¹,

Winiarski²

2015

Archives of Metallurgy and Materials

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The paper presents the numerical and experimental results of a new method for producing flanges on hollow parts. With this new method, the flange is extruded by a movable sleeve. This innovative technique is modelled numerically by the finite element method. The effect of workpiece and finished product geometries on the forming process is investigated and failure modes are identfied. The numerical reults are then verified in experiments. The tests are conducted using a three-slide forging press equipped with a special device. The numerical and experimental results show a good agreement, which proves that the developed method is correct.

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End forming of thin-walled tubes

Cited by 71 publications

References 6 publications

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

Design and Modeling Studies of Tube End Expansion using Response Surface Methodology

Numerical And Experimental Study Of Producing Flanges On Hollow Parts By Extrusion With A Movable Sleeve

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