In custom silicone molding and plastic injection, 80% of manufacturing defects and cost overruns stem from initial design flaws. Yude Technology provides comprehensive, in-house DFM analysis and Moldflow simulation to guarantee seamless mass production, lower piece price, and flawless cosmetic finish.
Our engineering team evaluates every 3D CAD model against strict physical molding dynamics to prevent porosity, flash, sink marks, differential shrinkage, and thermal stress.
Non-uniform wall thickness causes differential thermal cooling and volumetric shrinkage, leading to internal voids, sink marks, or severe warping.
Draft angles facilitate clean part ejection from steel cavity walls without drag marks, tears, or high ejection force stress.
LSR has an exceptionally low viscosity at high shear rates, capable of flowing into mold gaps as tiny as $0.005\text{mm}$ ($5\,\mu\text{m}$).
Gate selection determines material shear rate, flow front velocity, pressure drop, and the position of weld/knit lines.
Combining soft elastomeric silicone with rigid thermoplastics (PC, PA, PBT) requires cohesive chemical bonding and robust mechanical interlocks.
Sharp internal corners create severe notch stress concentrations, promoting crack propagation under fatigue loading.
| Design Parameter | Liquid Silicone Rubber (LSR) | Solid Silicone (HCR) | Engineering Plastics (ABS/PC/PA) |
|---|---|---|---|
| Recommended Wall Thickness | 0.8mm – 5.0mm (Thinner walls feasible down to 0.3mm) | 1.2mm – 8.0mm (Varying thickness compression) | 1.5mm – 4.0mm (Requires strict uniformity) |
| Draft Angle Requirement | 0° – 0.5° (Flexible demolding / Bump-off) | 0° – 1.0° (Easy manual stripping) | 0.5° – 2.0° per side (Mandatory for ejection) |
| Volumetric Shrinkage Rate | 2.5% – 3.5% (High thermal expansion) | 2.0% – 3.0% (Cure temperature dependent) | 0.4% – 2.0% (Material dependent e.g. ABS 0.5%, PA66 1.5%) |
| Max Viscosity & Flashing Gap | Extremely Low Viscosity ($< 0.005\text{mm}$ flash gap) | High Viscosity Gel ($< 0.02\text{mm}$ flash gap) | Medium/High Viscosity ($0.01\text{mm} – 0.03\text{mm}$ flash gap) |
| Undercut Feasibility | Excellent (Elastic deformation up to 20–30% strain) | Good (Manual stretch or air-blast ejection) | Requires Mechanical Side Actions (Lifters / Sliders) |
| Standard Tolerance Class | ISO 3302-1 Class E1 / E2 (High Precision) | ISO 3302-1 Class E2 / E3 | DIN 16742 / ISO 2768-mK |
Our senior tooling engineers conduct complete 3D Moldflow simulations (autodesk Moldflow / Moldex3D) covering cavity filling time, volumetric shrinkage, orientation-induced warpage, and cooling channel thermal distribution. Submit your CAD model (STEP / IGES) for an expert evaluation.
We analyze 3D STEP/IGS files, material specifications, Shore hardness, and application conditions.
Computer simulation evaluating cavity pressure drop, shear stress, knit line locations, and air traps.
Comprehensive PDF report detailing recommended wall modifications, parting lines, gate positions, and draft angles.
Direct technical meeting with your design engineers to approve revisions before CNC steel cutting.
A: LSR exhibits shear-thinning behavior with extremely low viscosity during injection under elevated temperatures (170°C–200°C). LSR can seep into tiny mold shut-off gaps as small as 5 microns (0.005mm). To prevent flash, Yude uses high-precision CNC machining, mirror EDM, optical mold alignment, and rigid mold bases.
A: We utilize self-adhesive LSR grades engineered with built-in organo-functional silane coupling agents that react chemically with the substrate surface during thermal curing. Substrates like Polycarbonate (PC) or High-Temp Nylon (PA66) undergo high-pressure injection overmolding, creating a cohesive bond that tears the silicone before delaminating.
A: Unlike rigid plastics requiring mechanical sliders or lifters for undercuts, soft silicone parts (Shore 10A to 50A) can expand elastically and be forced over mold cores ("bump-off") without damaging the part. DFM design rules require smooth lead-in chamfers (30°–45°) and avoiding sharp inner corners.
A: Our engineering team delivers a comprehensive, actionable DFM report within 24 to 48 hours after receiving complete 3D CAD files (STEP/IGS/X_T) and application specifications.