zielsicher Englisch, Metalltechnik, Schulbuch

Listen to Lilly and David and their supervisor Mr Kaup, talking about bending. Decide whether the statements are true or false. true false 1 Bending is a rare technique of non-cutting metal forming operations. 2 Bending changes many parts of the work piece. 3 Bending materials are soft steel, copper, zinc, aluminium and their alloys. 4 Bending expands the inner side of the material without ripping, the outer side is compressed. 5 If metal sheet is bent over a sharp edge, it will never develop cracks. Listen again and check if your answers above are correct. Then correct the false statements. 1. Bending is the most common technique of non-cutting metal forming operations. 2. Just one part of the work piece is changed, the bending zone. 4. The outer side of the material expands without ripping, the inner side is compressed. 5. If metal sheet is bent over a sharp edge, tiny cracks may develop Look at the picture below. What does it show? a folding machine bending sheet metal Look at these handrail-pipes. What is important when bending tubes? When bending tubes, special techniques are needed in order to avoid deforming the pipe cross section. Therefore, pipes are bent by filling them with sand or by special tube benders or hydraulic tube-bending machines. 07 A2 listening 4a5bd9 Word bank 07 covering Abdeckung tube Rohr profile Profil bending zone Biegezone expand dehnen ripping Reißen compressed gestaucht fibre Faser copper Kupfer zinc Zink aluminium (BE)/aluminum (AE)  Aluminium alloy Legierung bend (irregular: – bent – bent) biegen sharp edge scharfe Kante crack Riss pipe cross section Rohrquerschnitt hydraulic hydraulisch 09 folding machine Abkantpresse ✗ ✗ ✗ ✗ ✗ 08 B1 listening 4a5bd9 09 A2 10 B1 80 Unit 15 Nur zu Prüfzwecken – Eigentum des Verlags öbv