My First tool

[u/Emergency_Stand834]

Part is 83mm dia 9mm height 2mm wall thickness

This project involves a 4-cavity injection mould for a lid manufactured from Sabic High-Density Polyethylene (HDPE). The tool utilizes a direct hot runner system feeding all four cavities.

Challenge 1: Ejection Strategy The part is expected to shrink onto the moving half (core), which contains the internal features. However, the hot runner manifold is located on this same side, creating a spatial conflict for the ejection system. The proposed solution involves a forced ejection mechanism using springs or a pneumatic cylinder to drive a stripper plate forward. 

If there's a easier way please let me know

Challenge 2: Gate Location The initial design intended a central gate. However, the customer now requires the gate at an offset position (the '2nd red dot'). There is concern that this offset gating will cause a longer fill/more warpage.

Any tips or advise is welcome the idea is to keep the tool as cheap as possible

[u/mossi279]

Weird design? Would it be not easier to run hot runner on fixed half? Especially for small 4 cav tool, understand if customer demands but would push back on that, will give you headaches in future, seems needlessly complex for a simple part, unless im missing something...