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SKD61 Complex Mold Cavity Insert
This monolithic multi-profile mold cavity block is precision 5-axis CNC machined from SKD61 hot work tool steel, integrating integrated forming contours, slide mating shoulders and assembly positioning steps as a one-piece core forming insert for injection and low-pressure die casting molds.
- Material: SKD61 Hot Work Tool Steel
- Hardness: HRC 48–52 post quenching & tempering
- Tolerance: ±0.001 mm for all forming contour surfaces
- Surface Finish: Precision ground
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Optimized Ultra-Precision Multi-Axis Machining
We utilize full 5-axis CNC milling, jig grinding and wire EDM to machine the intricate internal cavity, stepped shoulders and external locating profiles in a unified datum setup. Full CMM 3D scanning verifies contour accuracy, perpendicularity and surface continuity to eliminate mismatched assembly gaps.
Our engineering team provides DFM thermal expansion optimization and mold flow analysis to reduce melt turbulence and molded part defect rates.
High-Precision Engineering
One-piece integrated structure eliminates assembly seams between split core segments, delivering seamless, flash-free molded part surfaces. Symmetrical stepped outer shoulders provide precise alignment with mold slide and base plates, ensuring repeatable cavity positioning across millions of molding cycles. Deep contoured internal profiles replicate complex 3D product geometries in a single forming insert, simplifying overall mold frame layout and reducing component count.
Thermal Resistant SKD61 Hot Work Steel Construction
Fabricated from premium SKD61 hot work tool steel, this cavity insert excels in elevated temperature molding environments:
- Excellent thermal fatigue resistance to withstand repeated high mold temperature cycles without cracking
- Low thermal expansion coefficient to preserve tight dimensional tolerances under sustained heat
- Balanced hardness and impact toughness to resist deformation from plastic melt injection pressure
- Strong bonding compatibility for ion nitriding and hard coating surface upgrades Ideal for automotive die casting, glass-filled high-temperature plastic injection and mass automated molding production.
Fully Customizable Contour Design
100% configurable geometry to match client product specifications:
- Custom 3D internal forming cavity profiles from customer STEP/IGS CAD files
- Adjustable shoulder sizes, locating step heights and mounting hole layouts
- Optional polished molding surfaces or nitride wear-resistant outer sliding faces
- Single-cavity and multi-cavity nested insert designs available
Key Features & Advantages
- Seamless One-Piece Forming: No split assembly joints eliminate plastic flash and improve finished part surface quality.
- High-Temp Dimensional Stability: SKD61 minimizes thermal deformation for consistent part sizing in hot molding cycles.
- Simplified Mold Assembly: Integrated locating shoulders cut mold build time and reduce spare component inventory.
- Long Cycle Service Life: Heat-treated substrate resists fatigue cracking and abrasive melt wear in high-volume production.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Material | SKD61 Hot Work Tool Steel |
| Alternative Materials | S136, SKD11, D2 |
| Heat Treated Hardness | HRC 48–52 |
| Forming Contour Tolerance | ±0.001mm |
| Perpendicularity & Flatness | ≤0.002mm |
| Surface Roughness | Ra ≤0.05μm (Ground), Ra ≤0.002μm (Mirror Polish) |
| Manufacturing Processes | 5-Axis CNC Milling, Jig Grinding, Wire EDM, Hardening & Tempering |
| Surface Treatments | Ion Nitriding, TiN Coating, Mirror Polishing |
| Customization | 100% Supported via 3D CAD Drawings & Physical Samples |
Applications
Automotive
Used as core cavity inserts for automotive aluminum die casting parts and glass-filled plastic connector housings; SKD61 withstands continuous high mold temperatures without contour distortion during mass auto component production.
Consumer Electronics
Applied in precision injection molds for miniature electronic housing frames, multi-port connector bodies and thin-wall structural plastic parts; seamless complex contours replicate intricate electronic product geometries with tight dimensional consistency.
Plastic Packaging
Ideal for thick-wall rigid cosmetic container molds and multi-feature packaging component cavity inserts; heat-resistant substrate handles fast-cycle high-temperature injection of rigid packaging resins.
Automated Molding Lines
Deployed as heavy-duty monolithic cavity forming inserts on fully automated injection and die casting production lines, requiring minimal maintenance and stable long-run molding performance for non-stop mass output.
