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The final process of preparing the mold - the mold box
The box is the process of combining the sand mold and the sand core into a mold as required. The mold-filled box is the last step in the preparation of the mold. The quality of the joint box is not high, the shape, size and surface quality of the casting are not guaranteed, and even the castings may be caused by eccentricity, wrong box, lifting the box, etc. scrapped. The box is generally carried out as follows:
(1) Thoroughly inspect, clean and repair all sand molds and sand cores, especially pay attention to check the drying degree of the sand core and whether the air passages are unblocked. If it does not meet the requirements, it should be repaired or discarded.
(2) The lower core orderly puts the sand core into the sand type, and strictly checks to ensure the wall thickness of the casting, the fixing of the sand core, the exhaust of the core, and the gap at the joint. The sand core without solid support shall be reinforced with the core support on the upper and lower sides to prevent the sand core from moving and floating during pouring. The sand core installed in the upper box should be fastened by the plug. When the joint between the sand core and the sand core is relatively large, it needs to be flattened with the filling material and dried with a blowtorch.
(3) Carefully remove the loose sand inside, thoroughly inspect the quality of the lower core, and put a circle of mud or asbestos rope along the periphery of the cavity on the parting surface to ensure that the parting surface is closed after the box is closed to avoid liquid metal separation. The profile gap flows out.
(4) Put the pressure iron or use a bolt or a metal clip to fasten the mold. Place the pouring cup and the riser ring and apply the sand to the joints around the parting surface to prevent running fire. Finally, the site is thoroughly cleaned for safe and convenient pouring.