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Ductile iron processing considerations - required Nodular cast iron

by:XEX     2021-03-26
Ductile cast iron is through get spheroidal graphite spheroidization and inoculation, effectively improve the mechanical properties of cast iron, especially improve the plasticity and toughness, and the strength is higher than carbon steel. Ductile iron processing small make up will come today to tell you about the required attention. 1, the lost foam casting liquid metal filling process, the foam mould liquefaction, gasification of the back up space by metal liquid, if the liquid metal filling velocity is slow, forming time gap is too big, will form the partial collapse of the risk. Filling speed, forming foam mould can't energetic gasification, increase residue in type. 2, pouring system planning should consider convenient features beam is put. Can meet the dry sand filling to the appearance of all the inner chamber, prevent appearance plane is horizontal azimuth, and blind holes in a horizontal or downward position. 3, want to consider appearance put convenience, can consider to dry sand filling together to face all the lumen, prevent the appearance of the plane in a horizontal position, and blind holes in a horizontal or downward position. 4, planning of gating system to ensure that all the strength of beam appearance. Especially on the coatings in the future to make sure the sprue joint can accept such as handling, such as oscillation sand filling operation. More than 5, pouring system chooses a brief way. So as to shorten the interval of liquid metal flows through. The gap between the SPR and casting looks not too small, to ensure that the liquid metal filling process is not deform the appearance for sand mold temperature. Hydraulic head should be more than 6, metal metal front interface of gas pressure, prevent choke ( Jet) 。 7 liquid metal, pouring system planning should help the fills the cavity smoothly, and has strong reducing slag and slag elimination and exhaust ability; Has a good collection of slag, qigong can, to achieve zero defect quality castings. 8, as long as have must eat sand content, the thickness of the ability to produce enough strength, after vacuum forming hard mold, make its can accept the effect of the metal fluid static pressure. That is about ductile iron processing needed attention, hope to be of help. Today small make up to you at this point, let's see you next time.
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