Two-Step Bent-Pipe Core Pull (8 Sliders) | Automotive Mold Design Judgment

Описание: Motion-based mold design is not about animation —
it’s about validating every movement before steel cutting.

This video explains why this mechanism was chosen over a more traditional solution, based on real manufacturing risks.

Project context

• Automotive plastic part, 1 cavity (1C1)
• DME metric standard components
• Masters single sprue bushing → cold runner → fan gate

Why two-step bent-pipe core pull

A one-step pull often increases risk of:
• Interference during opening
• Galling / shut-off surface damage
• Excessive slider load and unstable release

Mechanism overview (8 sliders)

Sliders are numbered #1 to #8 from the top-side view.

Demolding sequence (engineering logic)

1.Mold opening (A/B separation)
– Angle pins drive sliders #4, #5, and #8 for the first passive pull to create clearance.

2.Hydraulic pull – Stage 1
– Slider #1 is driven by a cylinder through a bent-pin linkage to pull the inner slider.
– Sliders #2 and #6 are driven by a cylinder + linkage to complete the first bent-pipe pull.

3.Hydraulic pull – Stage 2 (key step)
– Sliders #3 and #7 are driven by cylinders to push #2 and #6 for the second travel segment, ensuring full undercut release.

The core idea is simple: split the bent-pipe release into two controlled steps to reduce risk and stabilize demolding.

This is a design judgment based on manufacturing reality,
not just theoretical feasibility.

Motion-based mold design is not about animation —
it’s about validating every movement before steel cutting.

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Engineering Support for Injection Mold Design
(EU / US / International Projects)

• Design-for-Manufacturing (DFM) review before steel cutting
• Motion-based mold design for complex mechanisms
• Clear 3D mold structures with engineering intent

Contact:
[email protected]
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