Our company is an enterprise that produces industrial automatic regulating valves in China. One of the important parts - the valve plate, because of its large size, the small wall thickness of Zui is only 4~15mm, which makes the classification difficult. (Our company adopts the VRH-CO2 vacuum hardening method introduced by Japan), the positioning pin cannot be installed. Therefore, the valve plate is deformed, misaligned and the like, and the shape and dimensional accuracy of the casting cannot be guaranteed. To this end, we have repeatedly explored, after the use of the leakage mold process, successfully produced butterfly valve double-sided valve plate castings.
1 leaky mold design
The leakage mold modeling process, the parting surface is selected in the center of the valve plate. Due to the use of the leakage mode, the actual thickness of the model is greatly improved. In actual operation, based on the good quality 20-ply board, the wood is vertically and horizontally staggered, the model entity is made, and the suitable positioning pin is installed; It is also equipped with a 20-ply board, on which a double-sided ingate is fixed and mounted with several positioning pins. The thickness of the model has been reasonably thickened, avoiding the use of advanced materials and complex fabrication techniques.
2 use effect
According to the model made by the above process, since the actual thickness is thickened, the deformation ability is enhanced, and the service life of the model is greatly improved. When sculpt, place the bottom of the fake box on the stencil. The positioning box cone and the fixing pin are used to fix the bottom plate of the fake box, and then the model is fixed on the template by the positioning pin, and the parting surface is flat after the molding, and the shape and size of the cavity are accurate. The inspection results of several batches of castings show that the shape, dimensional accuracy and surface quality of the valve plate cast by this process meet the requirements of part design, avoiding the occurrence of defects such as deformation and misalignment.
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