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Aluminum casting of automobile wheel hub is a very important process in the production process of automobile wheel hub. The melting, casting and heat treatment processes of aluminum alloy play an important role in improving the quality of automobile wheels. The melting quality directly affects the surface quality and internal quality of products; The casting is the key factor to determine the product performance.
1、 What is an aluminum alloy casting?
1. Aluminum alloy casting refers to the process of making aluminum or aluminum alloy parts by various methods, which is called aluminum casting manufacturing process.
2. Aluminum castings are divided into structural type (such as engine cylinder block and transmission case), functional type (such as radiator core) and decorative type (such as lamp housing) according to their purposes.
II What is a car hub? The wheel hub is composed of the part between the wheel and the axle, which includes the spoke plate, rim, spoke positioning groove, corresponding bearing seat hole and other parts. During installation, it is necessary to ensure that they have correct position relationship with each other and maintain concentricity to make the whole wheel rotate flexibly.
III What is a car tire tread block? The pattern block on the automobile tire is a general name for the pattern patterns of various geometric shapes stamped on the tread rubber.
IV What is roll forming? The rolling forming method is a pressure processing method that uses the principle that the volume of metal is unchanged after cold deformation at room temperature to process the workpiece. (1) Mold pre forming (2) heating and pressurizing of blanks (3) removing pressure (4) finishing (5) inspection (6) packaging of finished products.
5、 Principle of rolling forming:
The stress produced by the tensile force of metal material is greater than the material yield limit is called plastic deformation resistance, and the plastic deformation produced by metal material under the action of external force is called strain or strain energy.
6、 What are the three main factors affecting rolling quality? （1） (II) (III) (1) Two important factors affecting rolling quality are:
(1) Die size accuracy; (2) Billet material and hardness (2) Factors affecting roll gap size include:
(1) The size of the cavity clearance; (2) Shape of roll gap; (3) The reasons why the roughness of roll surface (4) affects the change of flange height are:
(1) The height of flange varies greatly with the width; (2) The flange height decreases with the increase of flange thickness; (3) Die height when die depth increases.