Controlling Inside Diameter of Circular Tube by Extrusion

Makiyama, Takahiro; Murata, Makoto

doi:10.4028/www.scientific.net/msf.396-402.513

Cited by 5 publications

(4 citation statements)

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“…Here only those where the focus was put on hollow profiles are mentioned. In [1,2,3] a mandrel with different cross sections was applied and its position in the die was changed during extrusion in order to vary the wall thickness of seamless extruded aluminum tubes. In [4] electromagnetic compression was applied behind the extrusion press in order to vary the outer diameter of aluminum hollow profiles locally.…”

Section: Introductionmentioning

confidence: 99%

Extrusion of magnesium alloy hollow profiles with axial variable wall thickness

Negendank

Sanabria

Müller

et al. 2019

AIP Conference Proceedings

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Industrially extruded profiles are characterized by a constant cross section along the length since rigid dies are applied in the process. However, if it would be possible to extrude profiles with cross sections that can be locally adapted (tailored) to the acting forces or stresses this would mean a significant potential for weight and material savings. Hence, in this study the extrusion of magnesium hollow profiles with axial variable wall thickness was investigated. Therefore, a newly developed porthole die was applied and extrusion trials conducted in order to show the feasibility of producing load adapted magnesium hollow profiles with axially variable wall thickness. Billets of magnesium alloy AZ31 were extruded and the required extrusion force was measured vs. process time. After the extrusion tryouts the manufactured hollow profile sections were measured with respect to the obtained wall thickness, inner and outer diameter of the thin-walled and the thick-walled sections, and in the wall thickness transition areas. The feasibility of manufacturing AZ31 hollow profiles with axially variable wall thickness was proven successfully. A maximal wall thickness variation of ∆t=1.0 mm was achieved.

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Section: Introductionmentioning

confidence: 99%

Extrusion of magnesium alloy hollow profiles with axial variable wall thickness

Negendank

Sanabria

Müller

et al. 2019

AIP Conference Proceedings

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“…In [2] mandrels of different shape and movable die bearings were used in order to change the outer as well as the inner dimensions of aluminum square pipes during extrusion on a laboratory scale extrusion press. A similar machine was used for the extrusion of lead tubes with constant outer diameter with variable wall thickness using a conic mandrel [3]. Negendank et al [4] applied a stepped mandrel and an 8MN extrusion press for similar trials and successfully manufactured not one but multiple wall thickness variations over the profile length of aluminum tubes.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Material Flow and Characterization of Tube Dimensions of Indirectly Extruded Tailored Aluminum Tubes

Negendank

Mueller

Reimers

2014

AMR

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In this work the extrusion of tailored aluminum tubes is investigated. Therefore, a stepped mandrel was applied and moved in axial direction in order to vary the tube’s wall thickness. Since surface irregularities were observed on the tube’s surface in transition areas between the different wall thicknesses, the material flow was analyzed by FEM in order to clarify the origin of the surface defects. It was revealed that the inwardly directed material flow in combination with the lack of inward resistance when the mandrel step is moving in the region of the die bearing causes the geometric inhomogenities.

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“…1(c)). (1) If there are holes at the appropriate position of ribs, structural component could be lighter without reducing strength. (2) Installation of such tubes into shock absorption units could stabilize buckling behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…s 1(a) and (b) can be formed by conventional extrusion, the tube, which has variable cross section in longitudinal direction, cannot be formed conventionally. Although a method was proposed for changing inside diameter of circular tube axial direction [1], the method can not form the shape like Fig. 1(c) where tube has holes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tube Wall Thickness in Joining of Aluminum Tube and Holed Rib by Extrusion

Moroi

Kuboki

Murata

2009

KEM

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Existence of some holes at internal ribs enhances the function and value of the tubes. A new extrusion method is proposed here for the forming of this shape by extrusion with joining. The method involves the use of a unique mandrel that has a slit along its axis and two guides at the slit exit. A holed sheet is fed through the slit and joined with the inner surface of extrude tube. Effect of two parameters, that are tube-wall thickness and guide position h which is distance from guide top to die surface were clarified by FEA. Two kinds of three-dimensional analysis models were prepared. One of the analysis models treats the rib as rigid body to examine a gap between rib and tube. Another model treats the rib as the elasto-plasticity body as well as the billet to examine the effect of the guide position and the tube wall thickness on the rib deformation. The series of analyses was carried out with emphasis on the metal flow. The gap between tube and rib is able to be suppressed small and joining condition becomes satisfactory when guide position rose or tube wall was thin. When the guide position rose further, or the tube wall thickness was excessively thinner, the amount of the deformation of the rib increases, and it causes defects.

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Controlling Inside Diameter of Circular Tube by Extrusion

Cited by 5 publications

References 0 publications

Extrusion of magnesium alloy hollow profiles with axial variable wall thickness

Extrusion of magnesium alloy hollow profiles with axial variable wall thickness

Finite Element Analysis of Material Flow and Characterization of Tube Dimensions of Indirectly Extruded Tailored Aluminum Tubes

Effect of Tube Wall Thickness in Joining of Aluminum Tube and Holed Rib by Extrusion

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