Measurement of pressure distribution on die surface and deformation of extrusion die in hot extrusion of 1050 aluminum rod

Mori, T.; Takatsuji, Norio; Matsuki, Kenji; Aida, Tetsuo; Murotani, Kazuo; Uetoko, Kouichi

doi:10.1016/s0924-0136(02)00718-5

Cited by 28 publications

(18 citation statements)

References 1 publication

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“…Moreover, the angular deflection of the tongue is determined from Fig.10 and equations 1 and 2. The angular deflection of the tongue is displayed in Fig.11 which shows that it is increasing during the extrusion because the binding force (F b ) shown in Fig.12 between the container and the tool decreases with decreasing the friction force between the container and the billet as depicted in [1]. The angular deflection of the tongue reaches a value of 8 mrad and 7 mrad at the end of the extrusion of the first and the successor billets respectively.…”

Section: Resultsmentioning

confidence: 96%

Measuring the Deformation of a Flat Die by Applying a Laser Beam on a Reflecting Surface

Assaad

Geijselaers

Nilsen³

2009

KEM

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The design of extrusion dies depends on the experience of the designer. After the die has been manufactured, it is tested during an extrusion process and machined several times until it works properly. The die is designed by a trial and error method which is expensive interms of time consumption and the amount of scrap. Research is going on to replace the trial pressing with finite element simulations that concentrate on material and tool analysis. In order to validate the tool simulations, an experiment is required for measuring the deformation of the die. Measuring the deformation of the die is faced with two main obstacles: high temperature and little free space. To overcome these obstacles a method is tried, which works by applying a laser beam on a reflecting surface. This cheap method is simple, robust and gives good results. This paper describes measuring the deformation of a flat die used to extrude a single U shape profile. In addition, finite element calculation of the die is performed. Finally, a comparison is performed between experimental and numerical results.

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Section: Resultsmentioning

confidence: 96%

Measuring the Deformation of a Flat Die by Applying a Laser Beam on a Reflecting Surface

Assaad

Geijselaers

Nilsen³

2009

KEM

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“…), die maintenance, chemical composition of extruded material, etc. Values of parameters related to tribological loads on bearing surfaces are: contact pressures bellow 30 MPa, temperature of Al at profile surface up to 600ºC, extrusion profile speed up to 100 m/min; adhesion, abrasion and chemical reaction are the prevailing wear mechanisms [5][6][7][8][9][10][11][12][13]. For the prolongation of die service time in ca.…”

Section: Introductionmentioning

confidence: 99%

Some reasons for decreased service time of dies for Al hot extrusion

Fajfar

Panjan

Kugler

et al. 2013

Surface Effects and Contact Mechanics XI

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In this contribution some important reasons for decreased service time of selected nitrided and coated dies for Al extrusion are explained. The influences of contact pressure, length of bearing surface, nitriding conditions and of the preparation of inlet edge of bearing surface at PVD CrN coating were studied. Laboratory tests of the wear at lower and increased contact pressure and an analysis of the wear on industrial dies were carried out. The die design and the flow of the extruded material should lead to a decrease of the contact pressure on the bearing surface. Two different modes of the initial wear progress on the area at the exit edge of the bearing surface were observed. Despite good adhesional and other relevant characteristics of CrN coating, the analysis revealed that inappropriate construction of the initial edge of the die bearing surface in combination with the maintenance of the die seems to be the main reasons for a considerably decreased service time of these dies as expected.

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“…This increase reaches a value of 0.2 mrad. It is stated in [47] that the binding force F b shown in figure 3.16 between the container and the tool is responsible for the increase in the angular deflection. In [48], it is shown that this binding force is equal in magnitude to the friction force between the billet and the container.…”

Section: Experimental Results Of the 1 St Roundmentioning

confidence: 99%

“…This contact area decreases during the extrusion of the billet. The force (F b ) deforms the die tongue in the opposite of the extrusion direction [47].…”

Section: Comparison Between Experimental and Numerical Resultsmentioning

confidence: 99%

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Aluminium extrusion with a deformable die

Assaad¹

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Measurement of pressure distribution on die surface and deformation of extrusion die in hot extrusion of 1050 aluminum rod

Cited by 28 publications

References 1 publication

Measuring the Deformation of a Flat Die by Applying a Laser Beam on a Reflecting Surface

Measuring the Deformation of a Flat Die by Applying a Laser Beam on a Reflecting Surface

Some reasons for decreased service time of dies for Al hot extrusion

Aluminium extrusion with a deformable die

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