Inspection method of aluminium extrusion process

Garbacz, Piotr; Giesko, T.; Mazurkiewicz, A.

doi:10.1016/j.acme.2015.02.005

Cited by 10 publications

(10 citation statements)

References 7 publications

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“…Indeed, both the SEM/BSE analysis and optical microscopy did not detect the presence of any other phases or intermetallic precipitates, any abnormal microstructural features or any abnormal chemical element concentrations. It follows that the origin of the detected defects is linked to wear issues and, in detail, it can be recognized as relating totally to the processing parameters and the tools [23][24][25][26][27]. It should be highlighted that no correlation between the variation of extrusion parameters during the production trials and the species defects were identified.…”

Section: Discussionmentioning

confidence: 99%

“…The adhesion between the dye and the extruded material generated these defects, as testified by their peculiar morphologies. These defects can thus be recognized as pick-ups [23].…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, this composition is similar the composition of the AISI H13 tool steel, which is reported in Table 7. Since the extrusion dye is made in this material, its provenance is clearly proved [23][24][25][26][27].…”

Section: Discussionmentioning

confidence: 99%

“…Pick-ups (Figure 5a-point C) are intermittent score lines of varying lengths, which end in a fleck of aluminum debris. They can be easily identified by their chemical composition, which is the same as that of the extruded aluminum alloy [23]. The exogenous deposited layers were composed by a different material and they can be recognized as dye pick-up (Figure 5b-point A, Figure 5a-point A), which are particles worn-out of the extrusion dye and deposited on the semi-product surface [23][24][25][26][27].…”

Section: Areamentioning

confidence: 99%

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Surface Quality Improvement of AA6060 Aluminum Extruded Components through Liquid Nitrogen Mold Cooling

Ciuffini

Barella

Cecca

et al. 2018

Metals

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6xxx aluminum alloys are suitable for the realization of both structural applications and architectural decorative elements, thanks to the combination of high corrosion resistance and good surface finish. In areas where the aesthetic aspects are fundamental, further improvements in surface quality are significant. The cooling of the extrusion mold via internal liquid nitrogen fluxes is emerging as an important innovation in aluminum extrusion. Nowadays, this innovation is providing a large-scale solution to obtain high quality surface finishes in extruded aluminum semi-finished products. These results are also coupled to a significant increase in productivity. The aim of the work is to compare the surface quality of both cooled liquid nitrogen molds and classically extruded products. In this work, adhesion phenomena, occurring during the extrusion between the mold and the flowing material, have been detected as the main causes of the presence of surface defects. The analysis also highlighted a strong increase in the surface quality whenever the extrusion mold was cooled with liquid nitrogen fluxes. This improvement has further been confirmed by an analysis performed on the finished products, after painting and chromium plating. This work on the AA6060 alloy has moreover proceeded to roughness measurements and metallographic analyses, to investigate the eventual occurrence of other possible benefits stemming from this new extrusion mold cooling technology.

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Section: Discussionmentioning

confidence: 99%

“…The adhesion between the dye and the extruded material generated these defects, as testified by their peculiar morphologies. These defects can thus be recognized as pick-ups [23].…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Areamentioning

confidence: 99%

See 2 more Smart Citations

Surface Quality Improvement of AA6060 Aluminum Extruded Components through Liquid Nitrogen Mold Cooling

Ciuffini

Barella

Cecca

et al. 2018

Metals

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“…Therefore, products with varied cross sections such as rods, wires, sheets, tubes, hollow or nonhollow parts can be fabricated which are suitable for application in aerospace, construction, automobile, machinery, heat exchanger [1]. In aluminum extrusion process, die design plays an important role by which products' qualities are directly affected [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Guiding Chamber on Welding Pressure in Hollow Extrusion Die Design of Aa7075

Tuan¹

2018

JST

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Porthole die extrusion has a great advantage in the forming of hollow section of aluminum alloy tube. This paper aims at the development of an extruding seam square tube of AA7075 high strength aluminum alloy. In order to increase the welding pressure of the hollow AA7075 tube in extrusion process, a special die feature has been created. Several different proportions of chamber structure in outlet of extrusion die have been designed. The finite element analysis software DEFORM 3D to analyze various design parameters on the load – displacement and the welding pressure have been studied. In this study, a different high proportion in material guiding chamber has been defined. The results showed that if a suitable material guiding chamber has been built then welding pressure can be increased rapidly. When the ratio of chamber height and length is 2:1 the increased welding pressure is the best.

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