Torsten Kruse’s Post

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Kruse Analysis, Inc. / Kruse Training, Inc. / Moldex3D Software. We perform CAE Simulation Services and develop eLearning and Virtual Realty for the injection molding industry.

Core Deflection during Cavity Filling www.kruseanalysis.com / www.krusetraining.com / www.molding-expert.com Core deflection during injection molding occurs when the molten plastic pushes against the core—an internal feature or protrusion used to shape hollow or complex areas of the molded part—as it fills the mold cavity. This can cause the core to bend, shift, or break due to the high pressure exerted by the flow of material. Core defection leads to dimensional inaccuracies, part warping, or defects such as inconsistent wall thickness or misaligned features in the final product. It's essential to ensure proper core strength, mold design, and material flow control during the injection process to prevent this. #injectionmolding, #plasticsindustry, #moldmaking, #molding, #moldingdefects #plasticinjectionmolding, #plastics, #plasticsengineering, #molddesign, #partdesign, #moldex3d, #Spritzguss, #plastics, #plasticinjectionmolding, #plasticsengineering, #partdesign #arburg,#kunststofftechnik #kunststoffe ,#seminar, #kunststoffindustrie, #polymers,#moldmaking, #moulding,#mouldmaking,#mouldmaker

why not using a material with a higher young module (E) ?

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Greg K.

Innovator, Inventor, Plastics design expert, Mentor

2mo

A good representation but I did not see any flash up the end of the core. A solution would be to key the tip of the core into the die.

John Scott

Toolmaker IBM Retired.

2mo

One core for the barbed end and one for the threaded end. Meeting at the inside shoulder .

Poor mold designing

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Aaron Dupont

Engineering Technical Consultant at Abbott

2mo

This is why you need good tooling engineers, that core should have been supported by extending it into the split cavities, possibly adding small spring assist split face to keep the core centered while the part is being removed from split cavity ( if lift and strip b side timed with lift and strip). Gating on both side of the part as a cheaper less predictable outcome option. Also the ID of the thread should have been increased to reduce the huge thermal mass, (good DFM). Took 5 min and 3 of it type on my phone. Savings in time money, frustration, priceless.

Sean Diamond

Mold Designer. Design for Manufacture. Mold Maker. Product Designer. CNC Programmer. Additive Manufacturing. Metal Injection Molds.

2mo

Opposing gates eliminates this in most situations.

Lin An Y.

Tooling,Our service is 10 times faster than competitors, saving you 20% on costs, while providing high-precision mold solutions. Let us help you accelerate your projects, reduce expenses, and ensure exceptional quality!

2mo
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Nawaz S

Product Development & Manufacturing - Plastics @Ather Energy | Groupe PSA | SACL | L&T Valves | NTTF

2mo

This core pin deflection is seldom focussed while reviewing the mold design. Importance of giving proper anchoring at free end can be realized only when pin breaks due to such fatigue. Worth share.

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