Pratique du Shadowing: 10 Most common Sheet Metal defects - Apprendre l'anglais à l'oral avec la vidéo
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Welcome to Design Engineer's Cart.
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It is generally believed that all sheet metal materials with uniform thickness are collectively referred to as sheet metal.
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Sheet metal has a thickness in between 0 .5 to 6 millimeters.
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Commonly used sheet metal materials are stainless steel, galvanized steel, tin plate, copper,
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aluminum, iron, etc. When it comes to sheet metal design, there are several common defects that can arise.
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Here are 10 of them along with suggestions on how to avoid them.
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1. Dimensional inaccuracies.
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The main problem during the forming process is the influence on the dimensional accuracy resulting from the machines
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and the spring -back effects of the workpiece.
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Ensure accurate measurements by using CAD software, employing proper tolerances, and regularly calibrating equipment are some ways to prevent dimensional inaccuracy.
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Additionally the inaccurate calculation of the unfolded drawing directly affects the dimensional accuracy of sheet metal bending as well.
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2. Buckling.
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Buckling is the failure mode caused by high compression force acting on material.
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Avoid excessive material thinning, use appropriate bend radii, and incorporate stiffeners or ribs to reinforce vulnerable areas to eliminate buckling.
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3. Warping.
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Metal may shrinks and warps as it cools.
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Minimize internal stresses through proper material selection, symmetrical designs, and controlled cooling processes can reduce warping.
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4. Edge cracking.
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Edge cracks are longitudinal cracks located near the edges of the component.
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Avoid sharp bends by using appropriate bend radii, employ relief cuts or bend allowances,
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and select materials with suitable ductility are some ways to eliminate edge cracking.
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5. Surface imperfections.
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Surface defects are small concave imperfections that can develop during forming of material.
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Implement proper surface finishes, prevent scratching or gouging during handling, and conduct regular inspections to reduce surface imperfections.
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6. Welding issues, lack of fusion and incomplete penetration are the major welding issues.
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Design weld joints properly, select suitable welding methods, and ensure sufficient access for welding equipment to avoid welding issues.
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7. Fractures and splitting.
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Splittings are the most common type of failure in sheet metal forming processes, while fracture are uncommon in sheet metal .Utilize proper material selection,
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consider stress concentrations, and conduct structural analysis to prevent high stress areas are some ways to control fracture and splitting.
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Splitting typically occur in a drawn part near the punch radius.
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To avoid splitting, the material flow in the component must be improved, for example by increasing the punch radius.
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8. Tooling marks .The tooling used in press brakes will often leave a surface mark on the bent sheet metal.
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These marks are called die marks, die lines, or witness marks.
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Optimized tooling parameters, maintain sharp and properly aligned tools, and regularly inspect and maintain equipment are some ways to control tooling marks.
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9. Burrs and Sharp Edges.
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A sharp edge is also known as an edge that contains small imperfections which can create a sharp surface,
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and these imperfections are commonly referred to as burrs.
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Design appropriate deburring features, use suitable tooling, and employ post -processing techniques to remove sharp edges.
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Number 10.
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Incorrect hole placement.
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Hole diameter should be greater than the thickness of part.
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Holes should be placed three times the material's thickness plus the bend radius away from the bend.
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Be sure to place holes
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and slots at least two times the material's thickness away from an edge to avoid a bulging effect.
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The distance between two holes should be two times the hole's diameter to have enough strength.
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Use accurate measurement techniques, employ standard hole patterns, and double -check hole locations before production.
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By incorporating these strategies into your sheet metal design process, you can reduce the likelihood of encountering these common defects and ensure high quality results.
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Hope you like this video.
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I will see you again in next video.
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Thank you.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale s’appuie sur la vidéo « 10 Most common Sheet Metal defects ». Les mots qui reviennent le plus souvent : metal, sheet, edge, material, hole. Cette vidéo contient 50 phrases et 611 mots à répéter en shadowing. La partie parlée dure 4:39. Le locuteur parle à un rythme régulier d’environ 131 mots par minute, confortable pour le shadowing. Seuls 68 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| sheet nom | /ʃit/ | feuille |
| bend verbe | /bɛnd/ | courber, tordre |
| sharp adjectif | /ʃɑɹp/ | affilé, coupant |
| radius nom | /ˈɹeɪ.di.əs/ | radius |
| thickness nom | /ˈθɪknəs/ | épaisseur, grosseur |
| crack nom | /kɹæk/ | fissure |
| dimensional adjectif | /daɪˈmɛn.ʃə.nəl/ | dimensionnel, de dimension |
| employ verbe | /ɪmˈplɔɪ/ | employer, embaucher |
| suitable adjectif | [ˈsjuː.tə.bɫ̩] | approprié, convenable |
| fracture nom | /ˈfɹæk.t͡ʃʰəː/ | fracture |
| defect nom | /ˈdiːfɛkt/ | défaut |
| warp nom | /ˈwɔːp/ | déformation |
| buckle nom | /ˈbʌkəl/ | boucle |
| technique nom | /tɛkˈniːk/ | technique |
| refer verbe | /ɹɪˈfɜː/ | référer |
Prononciation à surveiller
- Les sons « th »: thickness /ˈθɪknəs/, thin /ˈθɪn/
- Les sons « sh » et « zh »: sheet /ʃit/, sharp /ʃɑɹp/, dimensional /daɪˈmɛn.ʃə.nəl/, measurement /ˈmɛʒ.ə.mənt/, sufficient /səˈfɪʃənt/
- Mots longs — placez bien l’accent: dimensional /daɪˈmɛn.ʃə.nəl/, accuracy /ˈæk.jɚ.ə.si/, eliminate /ɪˈlɪm.ɪ.neɪt/, diameter /daɪˈæmɪdɚ/, incorporate /ɪŋˈkɔɹ.pɚ.eɪt/
Les sons difficiles pour les francophones :
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: fracture /ˈfɹæk.t͡ʃʰəː/, punch /pʌnt͡ʃ/, suggestion /səˈd͡ʒɛst.ʃən/, scratch /skɹæt͡ʃ/, bulge /ˈbʌldʒ/
- /r/ anglais — langue recourbée, sans frotter la gorge: sharp /ʃɑɹp/, radius /ˈɹeɪ.di.əs/, crack /kɹæk/, fracture /ˈfɹæk.t͡ʃʰəː/, refer /ɹɪˈfɜː/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme sheet, bend, sharp.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.