1. Why are forgings 'stronger'?
Forging is like kneading dough, using enormous pressure to shape a metal blank. This process puts the metal inside the air holes, shrinkage and other 'small holes' are pressed together, but also the coarse grains "broken" into a finer and more uniform structure, so that the metal inside the 'grain' Follow the contour of the part neatly arranged. In this way, the tensile and fatigue resistance of the forging is greatly enhanced, as if the metal put on a layer of buff, especially suitable for bearing high loads, impact of key components, such as aircraft landing gear, engine connecting rods.
2.Reliability and advantages of car castings
Casting like 'inverted mould to make cake', can make the shape of the complex parts, engine block, gearbox shell of these internal structure of the delicate parts, with casting manufacturing car castings more convenient. And mass production, casting costs are lower. Modern casting technology is constantly upgraded, X-ray flaw detection, ultrasonic testing and other means to accurately pull out internal defects; high-strength cast iron performance to catch up with steel, coupled with reasonable structural design, qualified car castings in the design of the working conditions is very reliable.
3.The key factors of parts fracture
Whether the parts fracture, not simply depend on the casting or forging process. Design was not well thought out, the material selection error, the manufacturing process leaves defects, even forging parts may be 'off the chain'; on the contrary, well-designed, strict quality control of car castings, can also be stable service. In addition, overloading, accidental impact, harsh environment use, will accelerate parts damage.
We do not have to worry about castings with will not break thus leading to safety issues, and then before manufacturing, engineers will fully consider most of the situation, and materials, quality are strictly controlled testing, will maximise to ensure user safety.