zielsicher Englisch, Metalltechnik, Schulbuch

Read the following text about sintered materials. Then answer the questions. Sintered materials Pulverized metals are mixed up and pressed, under high pressure and high temperature, without melting it to the point of liquefaction . The processing of sintered work pieces takes place in the following steps: 1. preparation of the powder 2. blending the powder 3. compressing the powder mixture 4. sintering of the pellets 5. calibrating which means pressing the sintered material into a mould. The surface quality improves and higher dimensional accuracy is achieved. Important sintered materials are hard metals and ceramic cutting materials. Various machine parts, for example, plain bearings and filters are made of sintered materials. 1. Name important sintered materials. hard metals and ceramic cutting materials 2. Explain the term “calibrating”. pressing the sintered material into a mould 3. What does calibrating achieve? the surface quality improves and higher dimensional accuracy is achieved What do you think is an advantage or a disadvantage of sintering? Mark the advantages in green, disadvantages red. Translate the advantages and disadvantages. Cost effective production of serial parts green Kostengünstige Herstellung von Serienteilen High tooling costs red Hohe Werkzeugkosten High pressure forces red Hohe Presskräfte Little waste green Wenig Abfall Alloys using metallic materials can be produced. green Legierungen mit metallischen Werkstoffen können hergestellt werden. limited shaping red Eingeschränkte Formgebung The powder mixture achieves required material characteristics. green Die Pulvermischung kann gewünschte Werkstoffeigenschaften erzielen. 05 A2–B1 Word bank sinter sintern pulverized pulverisiert liquefaction Verflüssigung powder mixture Pulvermischung calibrate kalibrieren mould Matrize alloy Legierung ceramic cutting materials Schneidkeramik plain bearing Gleitlager series parts Serienteile plain bearing 06 A2 20 Unit 3 Nur zu Prüfzwecken – Eigentum des Verlags öbv