zielsicher Englisch, Metalltechnik, Schulbuch

Look at these pictures. What are they? In one picture you can see a product of a cutting operation, in the other, a product of a non-cutting operation. Which is which? A What is it? breaking discs Which operation? cutting operation B What is it? stamping steel sheet Which operation? non-cutting operation In a cutting operation a metal is processed by removing material in the form of chips. Chipping is done by geometrically defined cutting edges or geometrically undefined cutting edges. Non-cutting operations are technical operations without producing chips during the process. Label the edges. Are they geometrically defined or geometrically undefined? A B B  geometrically defined edges A  geometrically undefined edges In metalworking different methods are used. They can be classified into different groups depending on the physical phenomenon used. Chip forming: sawing, drilling, milling, turning, etc. Shearing: punching, stamping, scissoring Abrading: grinding, lapping, polishing, water-jet, sandblasting Heat: flame cutting, plasma cutting, lasercutting Electrochemical: etching, electrical discharge machining (EDM) 01 A2 Word bank cutting spanabhebend non-cutting spanlos lathe Drehmaschine turning Drehen drilling Bohren milling Fräsen scissoring Schneiden 01 chips Späne geometrically defined cutting edge  geometrisch bestimmte Schneide geometrically undefined cutting edge  geometrisch unbestimmte Schneide stamping steel sheet gestanztes Stahlblech breaking disc Bremsscheibe shearing Abscheren punching Stanzen stamping Prägen abrading Verschleißen grinding Schleifen lapping Läppen water-jet cutting Wasserstrahlschneiden sandblasting Sandstrahlen plasma cutting Plasmaschneiden etching Ätzen electrical discharge machining Funken­ erodieren 02 A2 Getting to know cutting and non-cutting operations Lilly and Miro are listening to their instructor: “Here we have a computerized lathe. You know, a lathe is used for turning. And turning is a cutting operation, so is drilling or milling, unlike e.g. scissoring, that’s a non-cutting operation. It sounds very complicated, but in fact it’s easy to understand if you know the difference between the two operations.” What do you already know about these operations? Tell a partner. 68 Unit 13 Nur zu Prüfzwecken – Eigentum des Verlags öbv