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02
2022
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09
Automotive Castings: What are the advantages of using castings in automobiles?
Since 1990, the use of magnesium in automobiles has been growing rapidly. Magnesium has been developing rapidly at an average annual rate of 20%. Magnesium alloys have become an important area in the development of automotive material technology. Compared with other metals, magnesium alloys have many performance characteristics. So what are the advantages of automotive castings: the application of castings in automobiles?
Automotive Castings: What are the advantages of using castings in automobiles?
Since 1990, the use of magnesium in automobiles has been growing rapidly. Magnesium is developing rapidly at an average annual rate of 20%. Magnesium alloys have become an important area in the development of automotive material technology. Compared with other metals, magnesium alloys have many performance characteristics. So, Automotive Castings: What are the advantages of using castings in automobiles?
Automotive Castings: What are the advantages of using castings in automobiles?
1. Low density. For example, the density of AZ91 magnesium alloy is 1.81gcm-3, which is about 2/3 of aluminum, 1/4 of steel, and close to the density of engineering plastics.
2. The tensile strength, yield strength, and elongation are comparable to aluminum alloy castings.
3. It has good electromagnetic shielding and radiation protection performance, can be processed with high precision, and has good thermal conductivity. Used for die-casting automobile hubs, it can effectively dissipate braking friction heat and improve braking stability;
4. It has good die-casting formability and dimensional stability. The wall thickness of die-casting parts can be as thin as 0.15mm, which is suitable for manufacturing various automotive die-casting parts;
5. The damping coefficient is good, and the anti-vibration performance is better than aluminum alloy and cast iron. The shell can reduce noise, and the seats and rims can reduce vibration, improving the safety and comfort of the car;
6. Easy to recycle. Recycled magnesium alloys can be directly melted and recast without reducing their mechanical properties.
Conclusion: A 100kg reduction in vehicle weight can reduce fuel consumption by 0.7L per 100 kilometers, and a 10% reduction in vehicle weight can improve fuel efficiency by 5.5%. With the energy crisis and increasingly strict environmental regulations, modern cars have increasingly high requirements for weight reduction and energy saving. Lightweighting has become the main development direction of automotive material selection. Magnesium alloys have become lightweight materials for automobiles, and their development and application have attracted attention from various countries.
What are automotive castings?
Automotive castings refer to metal parts used in automobiles, including engines, transmissions, rear axle housings, etc. This entry is reviewed by the China Science Popularization Encyclopedia Entry Compilation and Application Project. Commonly used die-cast aluminum alloys for automobiles include aluminum-magnesium-silicon alloys, aluminum-zinc-silicon alloys, and pure aluminum. Among them, the first two materials are widely used because appropriate rare earth elements are added during casting to improve their strength and plasticity. The main types of aluminum alloys used in automobiles are:
1. Wrought aluminum alloy: refers to profiles or plates whose mechanical properties are changed through heat treatment to meet the conditions of use;
2. Cast aluminum alloy: refers to profiles made into various shapes through pressure processing;
3. Aluminum alloys for special purposes: such as high-strength light alloys with good corrosion resistance and high heat resistance, and hard alloys with surface hardening treatment.
Automotive Castings: The forming process of die-casting parts by die-casting process is as follows:
1. Dissolving
2. Gating system
3. Solidification
4. Clear
5. Sand falling
6. Shell
7. Check
8. Packaging
9. Warehouse
8. Forming process
9. Melting and pouring. Before pouring, heat the aluminum liquid to 800~900 for a period of time.
10. Solidification within a certain temperature range to gradually solidify the liquid metal in the cavity to form a shape is the key process to obtain qualified products.
11. Use compressed air to remove residue from the mold.
12. Demolding: Take the mold that has been cooled to room temperature out of the machine tool, and then use manual or mechanical methods to remove the residue on the surface of the core.
Automobile casting
Shandong Gongchen Machinery Technology Co., Ltd.
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Address: Mucun Town, Fangzi District, Weifang City, Shandong Province
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