When pouring small parts with a waist spud, several points should be noted.
Firstly, the size of the spud should be selected according to the size of the casting. The larger the size of the spud, the more difficult the pouring, and the smaller the size of the spud, the more fragile the casting will be. The selected size should be slightly larger than the size of the casting.
Secondly, the pouring speed when pouring small parts with a waist spud should be balanced. It is not only necessary to ensure that the entire casting is completely filled, but also to ensure that the casting does not collapse due to overheating.
Thirdly, it is important to pay attention to the temperature when pouring. If the temperature is too high, it will cause the concentration of the liquid at the pour head to be too high and cause a mould assembly failure; and if the temperature is too low, the crystallization of the molten material at the pour head will delay the filling of the casting and cause premature closure of the mould relative to pouring.
Fourthly, when pouring with a waist spud, the upper and lower angles of the spud should be consistent. If the two angles are inconsistent, the amount of liquid on each side of the spud will be uneven, resulting in uneven walls or cavities in the casting. If the upper angle of the spud is too small, it will cause insufficient filling of the casting and the pouring will be incomplete.
Finally, when pouring small parts with a waist spud, the head should be used to guide the molten material into the core area as much as possible so that the molten material can fill the entire casting quickly and completely.
In general, when pouring small parts with a waist spud, it is necessary to select the appropriate pouring spud size, maintain a balanced pouring speed and temperature, ensure consistent upper and lower angles of the spud, and use the spud head to guide the molten material as much as possible. Only in this way can the accuracy and quality of the casting be ensured.
