Unit_6

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Nội dung Text: Unit_6

ENGLISH FOR AUTOMOBILE ENGINEERING UNIT 6 INDUSTRIAL PROCESSES AND PETROL ENGINES Lecturer: Lang Van Thang
Presentation Read 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.
Presentation a. The dies are opened. b. The metal is forced into the dies. c. The plunger is forced downwards. d. The dies are closed.
Practice 1 Read the text again to complete the table 6.1: First, the dies ……………. ………….. ……………. …………….. downwards. …………… is forced …………... Finally, …………… …………….
Practice 2 Use the first text to complete the second one: Figure 6.2: Steam engine, piston and crank the piston linear movement the crank rotary movement 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 2 Figure 6.3: Car generator and belt the engine rotary movement the dynamo or electrical power alternator In 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 events moves downwards moves up pushes mixes force B: The stages in the process is sucked is ignited is compressed are mixed is converted are repeated are pushed is forced
Development B1. First, air and petrol _ A1. First, the carburetor _ _ _ _ _ _together. Then _ _ _ _ air and petrol the mixture _ _ _ _ _ into together in the correct the cylinder. This is ratio. Then the piston _ termed the induction _ _ _ _ _ and sucks the stage. mixture into the cylinder through the inlet valve.
Development A2. The piston then B2. The mixture _ _ _ _ _ _ _and _ _ _ _ _ _ _ _ . This is compresses the called the compression mixture. stage.
Development A3. The spark plug ignites B3. The mixture _ _ _ _ _ _ ; the compressed mixture. the piston _ _ _ _ _ _ down. The combustion and rapid The downward linear expansion of the ignited movement _ _ _ _ _ _ _ into mixture _ _ _ _ _ the rotary movement by the piston down. The piston and crankshaft connecting rod _ _ _ _ _ assembly. This is known as the crankshaft round. either the ignition or combustion stage.
Development A4. Finally, the piston B4. Finally, the exhaust gases _ _ __ _ _ again to _ _ _ _ _ _ _out. push the burnt gases out through the exhaust valve.
Development B5. The four stages in the 4-stroke cycle _ _ _ _ _ _ again and again.

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