[Feilong Jiangli Edition]
Other metals except ferrous metals are collectively referred to as nonferrous metals. Aluminum, copper and its alloys are commonly used in automobile production.
Pure aluminium: Pure aluminium is a light metal material with a melting point of 660 C and a density of 1/3 of iron. Its conductivity and thermal conductivity are second only to silver and copper. It has good oxidation resistance and atmospheric corrosion resistance. Pure aluminum has very low strength and hardness, but its plasticity is very high. It can not be used as structural parts.
Aluminum alloy: Aluminum alloy is an alloy obtained by adding proper amount of tin, copper, magnesium, manganese and other elements into aluminum. After treatment, the mechanical properties of aluminum alloy are greatly improved. Aluminum alloy has high specific strength, good corrosion resistance, machinability and foundry, flexible strength design and beautiful surface can be achieved. It is obtained on automobiles. To a wide range of applications. For example, casting aluminum alloy is used to make cylinder block, cylinder head, rim and bumper, aluminum alloy is used to make radiator, condenser and other parts; aluminum and aluminum alloy are widely used in automobiles, on the one hand, the performance of these parts is improved, on the other hand, the lightweight of automobiles is achieved, which is an important development of Automotive materials in the future. The direction of the exhibition.
I have spend several hours now trying to figure out how to design a short of a snap dome (or rather the guiding principles for designing one). And by snap dome I do not mean now exactly the kind of domes that are used in switches.
If you don't know, snap domes are sheet metal parts that have a kind of stamped concave area that snaps back and forth when pressure is applied and generates a sound. This is exactly what I want to design one for, I want to hold it from one end while actuating it from the other end in order to generate a popping sound. Any help is appreciated.
Attached is a figure of a commercially available one.
【Feilong Jiangli Edition】}Alloy steel refers to the steel grade formed by purposefully adding one or more alloy elements on the basis of carbon steel in order to improve some properties of steel.
Alloying elements have great influence on the properties of steel. For example, adding chromium into carbon steel can improve the strength, hardness and corrosion resistance of steel. Adding nickel can not only improve the strength of steel, but also reduce its toughness. Adding silicon can improve the strength, hardness, fatigue strength and corrosion resistance of steel. The simultaneous use of several alloying elements has a more significant effect on the properties of steel than a single alloy element.
Only after heat treatment can the alloy steel achieve the purpose of improving its mechanical properties.
There are many kinds of alloy steels, which can be roughly divided into the following categories according to their uses: alloy structural steels, alloy tool steels, special performance steels.
Alloy structural steels include low alloy structural steels, alloy carburizing steels and alloy quenched and tempered steels.
Low-alloy structural steels: steels based on low-carbon steels with a small amount of alloy elements (3% - 5%); these steels have a strength of 10% - 30% higher than carbon steels with the same carbon content, and have good plasticity, toughness and weldability. Because of its simplicity in smelting, its production cost is similar to that of carbon steel, it is widely used to make various machine parts and engineering components, such as frame longitudinal beam, cross beam, engine lug, etc., and substituting low alloy structural steel for carbon structural steel can save steel, reduce weight and use reliably. Commonly used steel species are 12MnV, 16Mn and so on.
Alloy carburized steel: parts made of alloy carburized steel, after heat treatment, not only have higher surface hardness and wear resistance, but also can greatly improve the strength and toughness of the center of the parts, thereby improving the ability to resist impact loads; automotive parts withstand high speed, heavy load, strong impact and severe friction, such as piston pins, gears, shafts Parts and important bolts are made of alloy carburized steel after heat treatment.
Alloy quenched and tempered steel: Alloy quenched and tempered steel refers to the steel used after quenched and tempered, with high strength and toughness. If quenched and tempered and then quenched, the wear resistance of parts surface can be improved. It is often used to manufacture parts bearing heavy load and impact load. Such as machine tool spindle, automobile half shaft, connecting rod, steering knuckle, etc.
Other alloy steels and special performance steels: commonly used steel alloy spring steel, rolling bearing steel, alloy tool steel, weathering steel (good atmospheric corrosion resistance), stainless steel, wear-resistant steel, heat-resistant steel.