The process and features of pneumatic valve manufacturing

pneumatic valve manufacturing process characteristics of
pneumatic valve manufacturing process the manufacturing method of pneumatic valve, generally refers to the blank of the pneumatic valve parts manufacturing, machining, welding and heat treatment process and assembly process of pneumatic valve. Compared with other mechanical manufacturing technology, pneumatic valve manufacturing process has the following characteristics:

pneumatic valve manufacturing and inspection of blank is complicated:
pneumatic valves are used in the way of fluid pipe, it itself under various temperature and pressure of medium corrosion and scouring, if a blank has tiny flaw can also occur leakage, dielectric loss and waste generated. When transporting poisonous, inflammable, explosive or radioactive medium, pneumatic valve leakage tend to cause major accidents such as fire, explosion or poisoning pollution, and forced or factory production system.
in order to ensure the safety and reliability of the pneumatic valve, in addition to nominal pressure before they go out. ~。 Times the test pressure of pneumatic valve strength test, the external quality and internal quality of blank is also very strict.
pneumatic valve casting blank is structure more complex thin-walled shell, smooth surface, clear hand type casting requirements, especially for dense tissue, can not have blow hole, shrinkage cavity, porosity, cracks and defects such as bag of sand. In order to meet the above requirements, should take a series of casting process measures, such as molding material selects high refractoriness and control of molding sand moisture, modelling should be layered solid in place to ensure that the hardness of sand mould, adopt the reasonable casting riser system and strict control of casting speed and temperature, etc. All in all. Due to the high technical requirements, pneumatic valve casting process more complicated than the general casting blank.
pneumatic valve blank except for size and position precision and appearance inspection, sometimes on microstructure, chemical composition, mechanical properties, corrosion resistance and NDT inspection, to eliminate defects lead to leakage of pneumatic valve shell.

material to a wide range of machining is difficult:
there are many kinds of pneumatic valve material, in addition to all kinds of cast iron, carbon steel, alloy steel and non-ferrous metal, also use chromium stainless steel, chromium nickel stainless steel, chrome molybdenum steel nitriding, precipitation hardened steel, chrome molybdenum steel, chrome vanadium steel, chrome molybdenum nitrogen acid manganese steel, low temperature steel, titanium and titanium alloy, cobalt-based hard alloy and nylon, plastic and other non-metallic materials.
most of the high strength, high corrosion resistance and hard material cutting performance is not good. , such as stainless steel, because of its great toughness, high hot strength, low thermal conductivity, big chip with sex and work hardening trend, as a result of tool wear extremely easily, it is difficult to meet the parts processing precision and surface roughness. And pneumatic valve sealing surface geometric accuracy and surface roughness requirement is very high, so more increased the difficulty of the machining.
material cutting performance is poor, for the processing method, the tool Angle and shape of the parts, cutting tool material, cutting dosage and process equipment has brought many new topics.

pneumatic valve parts in a machine tool holder is difficult:
pneumatic valve structure and shape of the main parts is more complex, some parts is thin, long and thin piece, poor rigidity, when the machine tool processing, parts of the positioning and clamping are more difficult, so we need more complex special jig.
some pneumatic valve parts ( Such as pneumatic valve body and disc) Positioning base surface accuracy and roughness is low, sometimes even using the processing surface orientation, by machining precision and in areas such as the sealing surface roughness requirement is high, it is difficult to ensure machining quality. Therefore, to meet the needs of the process, often need to improve the positioning precision and roughness of the, or located in the machining on the surface of the base level, this increases the complexity of pneumatic valve manufacturing process.