Production verification of steel casting guard plate

Taking a certain type of worktable in Mazak as an example, the traditional process plan has a sand-iron ratio of 2.3, and it takes 2 hours to place the sand-proof chill iron to ensure the quality of the bottom worktable. After using the mesh bottom plate tooling, the sand-to-iron ratio decreased from 2.3 to 1.1, the sand-to-iron ratio decreased significantly, and the molding time was saved by more than half.

During production, buckle the mesh bottom plate tooling on the lower pattern, fill sand through the mesh hole and compact it, and the upper pattern of the mold normally uses the standard sand box molding. When closing the box, the upper sand box and the lower mesh bottom plate tooling shall be combined to close the box. The box lug of the sand box shall be tightly fastened with the mesh bottom plate tooling, so as to achieve the positioning effect of the box and avoid the phenomenon of hot metal pouring. During smelting and pouring, the molten iron enters the mold cavity through the pouring system and the casting begins to solidify and form. When the molten iron changes from liquid to solid, the 60 mm grid at the lower part of the mesh bottom plate tooling plays a chilling role and starts to chill during the gradual cooling process of the steel casting. The effect of chilling the steel casting through the sand separation layer is equivalent to that of sand separation chilling, avoiding the quality problems such as color difference and local high hardness of the steel casting, The bottom surface of the final steel casting plays a rapid cooling role through the reticulated bottom plate tooling, replacing the chilling effect of iron chill, and the amount of molding sand is saved by more than 50%

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