Pneumatic valve and pneumatic valve casting forging what is the difference

hoau manufacturing pneumatic valves are divided into pneumatic valve forging and casting are two different processing technology. Casting: molten liquid metal filling cavity cooling. Parts easy generation air hole in the middle. Forging: mainly with the method of extrusion molding at high temperature. You can refine grain of parts. Methods of forging: use a hammer, made of metal material in plastic state with certain shape and size of the workpiece, and change its physical properties. After casting, melt metal heating in a sand mold or mold, after cooling solidification become objects. Difference between the performance of forging, metal plastic deformation, has to do with fine grains, cut fiber continuous, so often used for important parts of blank making, such as axle, gear theory, etc. Casting of processed to have requirements, general cast iron, aluminum casting performance is good. Casting does not have forged a lot of advantage, but it can create complex shape of zero, so commonly used in mechanical performance requirements of said pieces PI MAO manufacturing. Such as machine shell.