Thin steel in the mold

[cityjack]

Good afternoon,

I am designing an injected molded part and am working on the core side of the part. I have a call out to my molder about this question but wanted to ask for another opinion while I wait for him to return my call. I have a pocket that is formed by a wall and a few ribs. After applying draft and the largest internal fillet(wall/2)that I can squeeze in there, I have a tight area down at the bottom of the pocket in one of the corners. It is filleted by 1.25mm but I am wondering what would be considered as a thin steel situation in that area? I am measuring .75 to 1mm across the smallest area which would be the thinnest part of the steel core in that area. Is that an unacceptable amount?

Thanks guys and I hope I gave you enough info to help.

Sid

 

[Pud]

General rule of thumb: ribs/core (on tool) ideally 3x rib/core thickness max.
i.e. 1mm rib = 3mm height/ 6mm dia core pin = 18mm high.

Minimum tool thickness of cavity/to tool edge = 6mm (1/4")

Much will depend on material/flow pressures etc.

H



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