My company is the domestic production of industrial automatic control valve business . One of the important parts - the valve plate (Figure 1), because of its overall size and the smallest wall thickness of only 4 ~ 15mm, resulting in difficult to type, (Japan imported VRH-CO 2 vacuum hardening modeling) Positioning pin can not be installed, resulting in valve plate deformation, dislocation and other defects, the shape of the casting, dimensional accuracy can not be guaranteed. To this end, after repeated exploration, we finally adopted the leak-proofing process to successfully produce the butterfly valve double-sided valve plate castings. 1 leakage mode process design Leak mold modeling process shown in Figure 2, the parting surface selected in the center of the valve plate. Due to the use of a leaky mold, the actual thickness of the mold is greatly increased. In practice, based on the good quality of the plywood, the wood is crisscrossed and glued to form a model entity and fitted with suitable dowel pins. Twenty plywood is also used, which is fixed on both sides of the gate, install a few pins can be. The thickness of the model has been reasonably thickened in this way, which avoids the use of advanced materials and complex manufacturing processes. 2 use the effect According to the above process to make the model, due to thickening of the actual thickness, strengthening the deformation capacity, the service life of the model greatly improved. When modeling, the false floor box placed on the template. The positioning box and the fixing pin are used to fix the false floor, and then the model is fixed on the model plate by the positioning pin. After the modeling, the parting surface is smooth and the cavity shape and the size are accurate. Test results of several batches of castings show that the valve plate cast by this process meets the design requirements of the part shape, size and surface quality, and avoids the occurrence of defects such as deformation and dislocation.
We have Rotary moulder (620/800/1000).
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Figure 1 double-sided valve plate structure diagram 
Figure 2 leakage mode process diagram
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