Casting Method Improvement of Nodular Iron Track Pad Produced on Vertically-parted Line
An introduction was made on the original casting method and caused concentrated sand inclusion and slag inclusion defects.By improving gating system and risers,the problem that the sand inclusion and slag inclusion defects on the large flat surface was effectively solved.Finally pointed out:(1)Producing board castings on vertically-parted line could realize liquid level rapidly rising to avoid the baking deformation of sand mold surface by high temperature iron liquid.However,it was not advisable to introduce the pouring system in the upper and lower parts of the casting and the upper flow was greater than the lower flow,because it would cause serious turbulent flow of the iron liquid in the mold cavity that would be unfavourable to the stable floating of the slag and sand particles.(2)Since the mold-filling velocity of iron liquid in ingate being relatively higher,in should not be facing to the sand core or sand lump,that it would cause sand washing.(3)For the board castings,using semi-unpressurized gating system could well solve the problem of former casting method of crowded sand inclusion and slag inclusions.
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维普
