This part is an aluminum shaft supporter. I am trying to create a HPDC mold for it. I am differentiating between either creating the undercut with a sliding core in the HPDC process or to drill the hole after the part is cast. Needless to say, considering the economic aspect and DFM.
probably the slider will be faster (and economical) in the long run, as long as the production quantity is high. Are there other machining operations to be done after the casting?
If tapped is not required (according your drawing, you don't have any threaded holes), why you need an extra machining for that holes? i assume by top surface holes you mean mounting holes... slider will be economical if that hole will not be tapped, but mostly it is an threaded hole and then in same process can be drilled and tapped. An cheaper mold maybe will be more convenient, depends of quantity and vendor... if by top hole you refer to shaft mounting hole, depends of use and required tolerance maybe can be more convenient to be molded using a mid party line with an smaller draft.
Yes,, holes and the top surface will be machined
I agree with Jack, but I'm most familiar with injection molding and not die casting.
For the HPDC process, should there be draft on the part so it releases from the mold?
Shrinkage of the material could also lead to distortion. If it needs to be very precise, most of the holes and bores may need to be machined after casting..