English for automobile engineering - Unit 6: Industrial processesand petrol engines

UNIT 6Lecturer: Lang Van ThangENGLISH FOR AUTOMOBILE ENGINEERINGINDUSTRIAL PROCESSESAND PETROL ENGINESPresentationRead the text and label the flow diagram with sentences a, b, c and d: Die casting is a common process in the engineering industry. It is used to produce many machine components. There are two main processes: hot chamber die casting and cold chamber die casting. Cold chamber die casting is a suitable casting process for metals with a high melting point, such as aluminum. For some metals with a low melting point, such as a zinc alloy, a process called hot chamber die casting is used. For example, a carburetor body is produced by this method. There are three main stages in the process. In the first stage, the dies are closed. Then the injection plunger is forced downwards and the molten metal is forced into the dies. Finally, in the third stage, the dies are opened in order to remove the carburetor body. PresentationThe dies are opened. The metal is forced into the dies.The plunger is forced downwards. The dies are closed. Practice 1Read the text again to complete the table 6.1:First,the dies......downwards.is forced...Finally,.Practice 2Use the first text to complete the second one: the pistonlinear movementthe crankrotary movement Figure 6.2: Steam engine, piston and crank In a steam engine, the piston is driven backwards and forwards. This type of movement is called linear movement. In order to convert the linear movement to rotary movement, the piston is connected to a crank by a connecting rod.Practice 2Figure 6.3: Car generator and beltthe enginerotary movementthe dynamo or alternatorelectrical powerIn a car, the _______ produces ________ movement. In order to.....Development Use the words in the boxes to complete A1 – A4 and B1 – B5:A: The function of components and eventsmoves downwards	moves uppushes	 mixes	forceB: The stages in the processis sucked	is ignitedis compressed	are mixedis converted	 	are repeatedare pushed	is forcedDevelopment A1. First, the carburetor _ _ _ _ air and petrol together in the correct ratio. Then the piston _ _ _ _ _ _ and sucks the mixture into the cylinder through the inlet valve.B1. First, air and petrol _ _ _ _ _ _ _together. Then the mixture _ _ _ _ _ into the cylinder. This is termed the induction stage.Development A2. The piston then _ _ _ _ _ _ _and compresses the mixture.B2. The mixture _ _ _ _ _ _ _ _ . This is called the compression stage.Development A3. The spark plug ignites the compressed mixture. The combustion and rapid expansion of the ignited mixture _ _ _ _ _ the piston down. The connecting rod _ _ _ _ _ the crankshaft round.B3. The mixture _ _ _ _ _ _ ; the piston _ _ _ _ _ _ down. The downward linear movement _ _ _ _ _ _ _ into rotary movement by the piston and crankshaft assembly. This is known as either the ignition or combustion stage.Development A4. Finally, the piston _ _ __ _ _ again to push the burnt gases out through the exhaust valve.B4. Finally, the exhaust gases _ _ _ _ _ _ _out.Development B5. The four stages in the 4-stroke cycle _ _ _ _ _ _ again and again.