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Zinc Alloy deficiencies Solutions


Controlled porosity generated key is to reduce the amount of gas incorporated in the casting , it is desirable to continue to accelerate the flow of metal to be diverted through the nozzle and sprue cone into the cavity , forming a smooth and consistent direction of metal flow , tapered channel design, that is to continue to accelerate the water flow should be decreased gradually from the inner nozzle gate , can achieve this purpose . In the filling system , the mixed gas due to turbulent mixing with the molten metal to form pores by the molten metal from the casting system research into the cavity in the die casting process simulation , the runner apparent sharp transition bit incrementing and poured channel cross-sectional area , would appear to make the metal flow turbulence and volume of gas , liquid metal can help smooth the overflow tank and exhaust gases into the slot from the runner and cavity mold discharged outside .
For shrinkage : To die casting solidification process in various parts of the heat evenly as possible while at the same time solidified. Outlet through rational design , thickness and location of the gate , mold design, mold temperature control and cooling , to avoid shrinkage produce . For intergranular corrosion phenomenon: the main control of harmful impurities in the alloy material , particularly lead <0.003 %. Note impurity elements brought waste .
For waterlines , cold shut lines, mold temperature can be increased to increase the speed of the gate , or an increase in the overflow tank in the cold septal area , to reduce the appearance of lines across the cold .
For thermal cracks : casting thickness not produce dramatic changes in order to reduce stress ; casting process parameters related adjustments ; reduce mold temperature .


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