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Precision Multi-Cavity Injection Mold Core Insert Block
- Material: STAVAX S136 / 718H Pre-hardened Mold Steel
- Hardness: HRC 28–36
- Tolerance: ±0.0025 mm
- Surface Finish: Fine Matte EDM Textured
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High-Precision Complex Core Engineering
Multi-layer stepped stacked core design precisely replicates complex stepped plastic part geometry, with integrated side slide locking grooves for side action mold structure matching. Distributed cooling through holes realize uniform heat transfer across all stepped core surfaces, effectively reducing part shrinkage, warpage and internal bubbles during injection cycles. Assembly bolt holes and positioning bores are machined with ultra-tight positional tolerance to guarantee zero offset during repeated mold opening and clamping.
Solid monolithic thick base structure delivers high rigidity against high injection clamping pressure, maintaining stable dimensional accuracy of finished plastic products over millions of molding shots.
Wear & Corrosion Resistant Mold Steel Construction
Premium mold steel material delivers comprehensive performance advantages for long-run injection molding cores:
- S136 stainless mold steel variant features excellent rust resistance, suitable for corrosive plastic raw materials (PVC, PA+GF)
- Balanced hardness and toughness to resist abrasion from glass fiber reinforced plastic materials
- Superior EDM texture & polishing performance, supports customized matte or glossy part surface requirements
- Stable thermal conductivity for consistent mold temperature control, shortening molding cycle time
- Compatible with post surface treatments: gas nitriding, PVD hard coating, texture etching to extend service life Ideal for medium-to-high volume production of complex structural plastic housings, automotive structural parts and electronic precision components.
Custom Mold Engineering Support
- Custom block outer dimensions, multi-step core profile, slide groove layout and cooling circuit design based on customer 2D/3D CAD drawings & physical product samples
- Optional surface upgrades: Mirror Polishing, Chemical Texturing, Gas Nitriding, TiN PVD Hard Coating
- DFM mold flow consultation: gate optimization, cooling balance, shrinkage compensation, slide mechanism matching
- Fast prototype core sampling and mass batch production delivery
Key Features & Advantages
- Multi-Step Complex Core Machining: 5-axis simultaneous CNC + sink EDM achieves high-fidelity replication of stacked stepped product geometry with micron-level precision.
- Integrated Slide Lock Grooves: Built-in positioning grooves perfectly match side slide mold components, simplifying overall mold assembly.
- Full-Area Uniform Cooling: Strategically distributed cooling holes eliminate hot spots on multi-layer core surfaces to cut reject rates.
- High Rigid Anti-Deformation Base: Thick solid square base withstands high injection pressure without core deflection for consistent long-run production.
- Full Customizable Design: No fixed standard core profiles; tailor core structure, cooling layout and mounting holes to unique plastic product demands.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Mold Material | 718H Pre-hardened Mold Steel / S136 Stainless Mold Steel |
| Alternative Materials | P20, H13 Hot Work Steel, NAK80 Mirror Steel |
| Hardness | HRC 28–32 (718H); HRC 32–36 (S136 after heat treatment) |
| Dimensional Tolerance | ±0.0025mm for core profile, hole position & block thickness |
| Flatness | ≤0.0035mm per 100mm block length |
| Core Surface Roughness | Ra ≤1.6μm (EDM matte); Ra ≤0.02μm (mirror polished option) |
| Manufacturing Processes | 5-Axis CNC Milling, Sink EDM, Wire EDM, Precision Drilling, Deburring, Heat Treatment |
| Surface Treatments | Mirror Polishing, Texture Etching, Gas Nitriding, PVD Hard Coating |
| Customization | 100% Fully Customized via CAD Drawings & Physical Samples |
Applications
Automotive Structural Plastic Parts
Used as core inserts for automotive internal brackets, connector housings and small structural plastic components. Multi-step core design fits complex stepped automotive plastic parts, corrosion-resistant S136 material adapts to glass fiber reinforced automotive plastics to reduce mold wear.
Consumer Electronics Precision Housings
Applied for injection molding of charger frames, power adapter shells, wearable device structural brackets and connector plastic cores. High-precision stepped core ensures tight assembly tolerance for electronic components, uniform cooling eliminates surface warpage of thin-wall electronic casings.
Household & Small Appliance Components
Ideal for small home appliance plastic supports, cosmetic packaging structural bases and daily-use plastic structural fittings. Customizable EDM textured surface delivers matte anti-scratch appearance for consumer end products.
Medical Disposable Plastic Parts
S136 stainless steel core variant meets medical hygiene standards, suitable for medical instrument plastic brackets, syringe structural shells and disposable medical device plastic components, resisting corrosion from medical-grade plastic additives.
Industrial Automation Plastic Connectors
Deployed for injection molding of sensor housings, wiring terminal plastic bases and automation equipment structural plastic parts. High-rigidity core block maintains stable precision under long-cycle mass production for industrial precision plastic components.
