Cooling of large cores For large core diameters (40 mm and larger), a positive transport of coolant must be ensured. This can be done with inserts in which the coolant reaches the tip of the core through a central bore and is led through a spiral to its circumference, […]
For areas in the mold where it is not possible to use normal drilled cooling channels, alternative methods must be employed to ensure these areas are uniformly cooled with the rest of the part. […]
In general, the cooling system will be roughly drilled or milled. Rough inner surfaces enhance turbulent flow of coolant, thus providing better heat exchange. […]
Cast to the net shape mold blanks–Another effective measure used to extend mold life is the use of cast to net shape tools with their as-cast gating system and cast to net shape mold cavity. […]
Repair by welding–Permanent molds made of steel exhibit longer life because deteriorated areas may be repaired by conventional welding. […]
Replaceable in serts–One possible solution may be the use of replaceable inserts that can be put in the sprue well area. […]
Grind the mold area and create a new sprue well by enlarging the old one- This practice is only a temporary cure yielding mixed results. Though the mold is repaired, […]
All water-cooling systems require proper maintenance to ensure the passages do not become clogged with scale from minerals in the water. To combat this issue, […]
Spray or Vaporization Cooling of Permanent Molds-In this cooling system design,vertical passages in the mold are sprayed with water from nozzles located in the top manifold. […]
The cooling technique also presents problems during the drilling of the passages.This method allows drilled cooling passages to be placed precisely in the mold; […]