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What is the difference between valve casting and forging?

Writer: admin Time:2021-03-17 22:22 Browse:

People who come into contact with valves should all be exposed to the terms casting and forging. Casting and forging are two different processes for making valves. What are their respective meanings?
 
As a metal thermal processing technology, casting has been mastered by mankind for about 6000 years. Casting valve: the metal is smelted into a liquid that meets the requirements and poured into the specified valve model. After cooling, solidification and cleaning, a valve casting with a predetermined shape, size and performance can be obtained. This is the entire process of casting a valve.
 
The connection between casting and valves came after the 20th century. Casting developed rapidly, creating ductile cast iron and malleable cast iron that are still often used in valve products, as well as ultra-low carbon stainless steel, aluminum copper, aluminum silicon, aluminum magnesium alloy, and titanium. Cast metal materials such as base, nickel base alloy, etc.
 
The main advantage of casting is that the cost of casting blanks is low, and it can show its economic efficiency for parts with complicated shapes, especially with complicated inner cavities. At the same time, it has wide adaptability and good comprehensive mechanical properties. However, many materials and equipment are required for casting production, and dust, harmful gases and noise will be generated, which will pollute the environment.

 
Forged valve is a processing method that uses forging machinery to apply pressure to metal valve blanks to produce plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes. According to the forming method, forging can be divided into open forging (free forging) and closed mode forging. According to the deformation temperature, forging can be divided into hot forging, warm forging and cold forging. Forging materials are mainly carbon steel and alloy steel with various compositions, followed by aluminum, magnesium, titanium, copper, etc. and their alloys. The original state of the material includes bar stock, ingot, metal powder and liquid metal. The ratio of the cross-sectional area of ​​the metal before deformation to the die cross-sectional area after deformation is called the forging ratio.
 
Through forging, the as-cast looseness of metal and welding holes can be eliminated. The mechanical properties of forgings are generally better than those of castings of the same material. For the important parts of machinery with high load and severe working conditions, forgings are mostly used except for simpler shapes that can be rolled, profiles or welded parts. The correct selection of forging ratios has a lot to do with improving product quality and reducing costs.

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