TOOL & DIE, INJECTION MOLDING & SILICONE TOOLING

Injection Mold & Silicone Draft Angle Clearance Calculator

Compute precise cavity draft angle tapers ($\Delta x$), surface texture draft penalties (VDI / SPI), volumetric polymer mold shrinkage compensation factors, parting line shut-off lands, and injection clamp tonnage requirements.

1. Part Depth & Polymer Shrinkage

Polymer / Silicone Resin Type

Feature Draw Depth ($H$) [mm]

Vertical cavity height / rib depth along the mold pull direction.

Surface Texture & Finish Standard

Selected Draft Angle ($\theta_{\text{draft}}$) [Degrees]

2. Parting Line & Projected Clamping Area

Projected Part Length ($L_{\text{proj}}$) [mm]

Projected Part Width ($W_{\text{proj}}$) [mm]

Number of Mold Cavities ($N$)

Taper Offsets & Mold Machining

CLEAN EJECTION

Lateral Taper Shift ($\Delta x$)

0.92 mm / side

$H \times \tan(\theta_{\text{draft}})$

Total Wall Thickness Growth

1.83 mm

Base to top of rib

Shrink Multiplier ($M_{\text{mold}}$)

1.0183

Scale CAD cavity by +1.83%

Machined Cavity Length

122.20 mm

Includes thermal shrink compensation

Press Tonnage & Shut-Off Land

Total Projected Shot Area

192.0 cm²

96.0 cm² per cavity

Required Machine Clamp Force

76.8 Tons

Based on 400 bar cavity pressure

Min Parting Shut-Off Land

15.0 mm

Prevents tool coining & flash

Ejector Pin Safe Clearance

0.015 mm

Max flash gap clearance

CNC Mold Core/Cavity DXF Layer Spec

                        CAVITY_TOP_SPLIT: Scaled by $+1.83\%$ @ $+0.92$ mm draft perimeter

                        PARTING_SURFACE_LAND: Minimum $15$ mm flat sealing collar around perimeter

                        CORE_RIB_PULL: Minimum draft $\ge 1.0^\circ$ to eliminate vacuum sticking

                        GATE_LOCATION: Sub-gate / edge-gate @ $+0.15$ mm freeze-off land