Is cast into the Industrial Valves casting valve, general casting valve pressure levels are relatively low ( Such as PN16, PN25, PN40, but also have high pressure, can go to the 1500 lb, 2500 lb), And most of them are for (above basis. That forging valve forging, are generally used in high grade pipeline, the relatively small caliber, usually under (. A, 1, casting blank casting production cost is low, for complex shape, especially the parts with complex inner cavity, more can show its economical efficiency; At the same time, it has a wide adaptability, and has better comprehensive mechanical properties. 2, casting: the metal melting into meet certain requirements of the liquid is poured into the mold, after cooling solidification, men get a predetermined shape, size and performance of the casting ( Parts or blank) The technological process. The foundation of modern machinery manufacturing industry technology. 3, but casting required to produce the material ( Such as metal, wood, fuel, molding materials, etc. ) And equipment ( Such as metallurgical furnace, sand mixing machine, molding machine, core making machine, shakeout machine, shot blasting machine, cast iron plate, etc. ) More, and can produce dust and harmful gas and noise and pollution of the environment. 4, casting a lot of more phyletic, the modelling method is traditionally divided into: (1) ordinary sand mold casting, including green sand mold, dry sand mold and chemical hardening sand mold 3 classes. (2) special casting, press molding materials and can be divided into natural mineral sand as the main special casting molding materials ( Such as investment casting, mold casting, shell mold casting foundry, negative pressure casting, mold casting, ceramic mold casting, etc. ) And metal as the main mold material of special casting ( Such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc. ) Two categories. 5, the casting is one of the earlier human master metal hot working process, about 6000 years of history. In 3200 BC, the copper casting frog Mesopotamia. Between 13 to the 10th century BC, China has entered the heyday of bronze casting, craft has reached a quite high level, such as heavy 875 kilograms of shang dynasty SiMuWu square, the warring states period of the statue of yi plate, and through the lens of the western han dynasty is the representative of the ancient casting products. Early casting are greatly influenced by the pottery, casting mostly agricultural production, religion, life aspects such as tools or equipment, color art is thicker. In 513 BC, the Chinese cast out of the world can be found in the earliest written records of the iron & ndash; — The state of jin cast ding ( About 270 kg) 。 Before and after the 8th century, Europe began to produce cast iron parts. The 18th century after the industrial revolution, casting into the great industrial service in the new period. In the 20th century, the development of casting speed, successively developed nodular cast iron, malleable iron, ultra-low carbon stainless steel and aluminum, copper, aluminum, silicon, aluminum and magnesium alloys such as titanium, nickel base alloy casting metal materials, and the new process of grey cast iron inoculation treatment. After the '50 s, the wet sand modelling, high-pressure chemical hardening sand molding and core making, negative pressure molding, and other special casting, blast cleaning, etc. New technology. 6, casting process usually includes: (1) cast ( Make liquid metal solid casting container) Preparation, casting according to the materials can be divided into sand mold, metal, ceramic, mud, graphite, etc. , can be divided by use disposable, semi permanent and permanent type, mold preparation quality are the main factors influencing the casting quality; (2) cast metal melting and pouring, casting metal ( Casting alloy) Main cast iron, cast steel and casting non-ferrous alloy; (3) casting processing and inspection, foreign body casting processing including removal of core and the casting surface, remove poured riser, shovel grinding burrs and phi seam protruding content and heat treatment, such as plastic, rust and rough machining and so on. Import valve gate 2, 1, forging, forging pressure is the use of forging machinery for metal blank, make its produce plastic deformation in order to obtain certain mechanical properties, a certain shape and size of forging processing method. 2, one of two major parts of forging. By forging can eliminate the as-cast osteoporosis of the metal, welded holes, general is better than that of the same material of the casting on the mechanical properties of the forgings. Mechanical load is high, the working conditions of severe important parts, in addition to a simpler shape rolling plate, profile or welding parts are available, use forging more. 3, forging materials are mainly components of carbon steel and alloy steel, followed by aluminum, magnesium, titanium, copper and its alloy etc. Material of the original state has a bar, ingot casting, metal powder and liquid metal, etc. Metal in the deformation of the cross-sectional area before and after deformation area is known as the forging ratio. To correctly choose the forging ratio on improving product quality, reduce cost. 4, forging press forming method can be divided into: (1) the open-die forging ( Free forging) 。 The use of impact or pressure in two for iron (metal Anvil block) Between deformation in order to obtain the required forgings, basically have manual forging and mechanical forging two kinds. (2) closed model forging. Metal blank in a certain shape in the bore of the forging die forging compression deformation, can be divided into the die forging, cold heading, rotary forging, extrusion, etc. According to the deformation temperature forging can be divided into hot forging ( The processing temperature above the recrystallization temperature of billet metal) , warm forging, Below the recrystallization temperature) And cold forging ( Room temperature) 。
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