Attentions about cooling process and pouring process of Lost foam casting

1. Attentions about cooling process and pouring process of Lost foam casting Lost foam cating is no adhesive dry sand casting,lost foam casting requires a certen of time for cooling after pouring casting,shakeout,hot casting and loose sand can be separated on vibrating conveyer shakeout machine,hot sand with dry coating or other impurity through the shakeout grid on the orifice plate into the sand treatment and reuse system,after screening,cooling and other process to clean impurity,iron bean and dust,when the temperature of sand is down to 50℃,then convey to sand hopper. dedusting, magnetic separating, The cooling process of lost foam casting is to mix and roll hot sand by grouting machine,also spray water , air cooling and other cooling dedusting,when sand is cold, rollback drum,cold sand fall into screening plant, Sifted sand is from a short distance belt conveyor to the bucket elevator, lifting the sand to the sand bucket.. The pouring process of lost foam casting is molten steel filling process, while foam mold vaporization and disappearing. The whole process needs to be noted that: (1)Throughout the runner will be filled with molten steel, if not filled, moulding sand is prone to collapse and air inflow due to the limited strength of the coating layer,lead to casting defects. (2) During pouring molten steel, we guarantee to do steady, accurate, fast,filled pouring cup soon,and be fast continuous flow,1 ton of molten steel should be poured within 1 minute. If the casting parts in one mold are with liquid drying,then casting will inhale the air, may cause collapse or sand casting porosity increasing, lead to casting rejection. (3).Lost foam casting is negative pressure enclosed, and must be closed under pouring cup. Molten steel into the molding die, it begins to burn liquefaction and

2. gasification disappear, liquid steel tip short distance temporary cavity is formed, so liquid steel filled and foam disappeared about the same rate. To temperatures in liquid steel melting tank with other models, casting sprue should be appropriate far away from the model. While pouring,need to regulate and control the degree of vacuum in the negative pressure within a certain range, after pouring,casting parts need to be kept under constant negative pressure for some time, the negative pressure is stopped, after condensation of liquid steel,casting parts are out of the box. prevent high