An investigation of the curvature of bars and tubes extruded through inclined dies

Shiraishi, Masashi; Nikawa, Makoto; Goto, Yukihiro

doi:10.1016/s0890-6955(03)00201-3

Cited by 29 publications

(11 citation statements)

References 2 publications

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“…Another way of achieving extrusion-bending integration is by utilising an inclined die, through which the material flow velocity distribution along the profile cross-section in the deformation zone can be adjusted. Shiraishi et al [15][16][17] proposed a novel integrated extrusion-bending forming method for producing curved profiles, in which a billet is extruded through a die aperture inclined towards the central axis of the container at a predetermined angle. Experiments were carried out using plasticine as billets and it was found that by adjusting the inclination angle of the die aperture, the curvature of the extruded profile can be varied, and greater inclination angle leads to increased curvature.…”

Section: Introductionmentioning

confidence: 99%

Analysis and modelling of a novel process for extruding curved metal alloy profiles

Zhou

Lin

Dean

et al. 2018

International Journal of Mechanical Sciences

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Section: Introductionmentioning

confidence: 99%

Analysis and modelling of a novel process for extruding curved metal alloy profiles

Zhou

Lin

Dean

et al. 2018

International Journal of Mechanical Sciences

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“…The method essentially is sideways extrusion from a cylindrical container using opposing punches. The relative movement of slower to faster punch is defined by extrusion velocity [17] (b) Curved profile extrusion (CPE) [19] (c) Inclined die orifice extrusion [20] (d) Multi-hole extrusion [24] Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

“…1. Illustration of process principles of extrusion-bending integrated methods which are based on external bending apparatus [17,19] and extrusion tooling designs [20,24] to influence material flow.…”

Section: Resultsmentioning

confidence: 99%

“…Another method for obtaining curvature is by introducing asymmetry in the metal flow, by tool design. Using this concept, Shiraishi et al [20][21][22] developed a novel extrusion-bending method for producing curved bars and tubes, in which a billet is extruded through a die orifice with its axis inclined towards the central axis of the container (see Fig. 1c).…”

Section: Introductionmentioning

confidence: 99%

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Feasibility studies of a novel extrusion process for curved profiles: Experimentation and modelling

Zhou

Lin

Dean

et al. 2018

International Journal of Machine Tools and Manufacture

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The work described in this paper concerns a novel method for directly forming curved profiles/sections from billets in one extrusion operation using two opposing punches. Its mechanics are based on internal differential material flow, and it has been given the acronym, differential velocity sideways extrusion (DVSE). A tool set enabling sideways extrusion to be performed using opposing punches moving with different velocities was used for a series of experiments in which punch velocity ratio and extrusion ratio were process parameters. Plasticine was used as a model work-piece material and a series of compression tests were undertaken, to determine its constitutive properties and gain an estimate of work-piece die friction for use in process simulation. Curvature of extrudate can be controlled and varied using a difference between the velocities of the two punches, defined by velocity ratio. Greater curvature is achieved with lower velocity ratio. Curvature is also dependent on extrusion ratio, an increase in which increases curvature, although curvature is less sensitive to it than to velocity ratio. The extent of work-piece flow velocity gradient across the die exit orifice, which causes curvature, has been identified. Severe plastic deformation of the extrudate occurs in a way similar to channel angular extrusion (CAE), thus a greatly promoted effective strain level is achieved, though it is not always uniform across a section. The inner bending region of an extrudate experiences maximum localised effective strain, which decreases with decrease in curvature. To the authors' knowledge this is the first publication in which extrudate curvature is deliberately induced using opposing punches with differential velocities. Although only fixed velocity ratio values have been used in the work described in this paper the ability to change during operation exists and the process has the potential for the production of a profile with different curvature along its length

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“…The authors proposed an extrusion process for production of curved bars and tubes, in which a billet is extruded through a die aperture inclined at an arbitrary angle [6,7]. In the extrusion process, the curvature of the extruded bar or the tube can be continuously varied by changing the inclination angle of the die aperture.…”

Section: Introductionmentioning

confidence: 99%

Prediction of curvatures of parts extruded through rotary die using fuzzy inference

Shiraishi

Nikawa

Kubota

et al. 2007

Journal of Materials Processing Technology

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An investigation of the curvature of bars and tubes extruded through inclined dies

Cited by 29 publications

References 2 publications

Analysis and modelling of a novel process for extruding curved metal alloy profiles

Analysis and modelling of a novel process for extruding curved metal alloy profiles

Feasibility studies of a novel extrusion process for curved profiles: Experimentation and modelling

Prediction of curvatures of parts extruded through rotary die using fuzzy inference

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