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718H Mold Steel + Copper Heat Conduction Cavity Insert Block
This square mold cavity block is 5-axis CNC precision machined from 718H pre-hardened mold steel, embedded with high-purity red copper conformal cooling inserts inside the forming cavity, integrated with mold mounting through holes, positioning pin holes and cooling flow passages. It is a high-efficiency temperature-control core cavity component for high-precision plastic injection molding.
- Main Material: 718H Pre-Hardened Mold Steel + C11000 Red Copper
- Hardness: HRC 28–32 (718H); HB 80–90 (Red Copper)
- Tolerance: ±0.002 mm
- Surface Finish: Precision Milled Matte Steel + Polished Copper Heat Channel
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High-Efficiency Conformal Cooling Cavity Engineering
Built-in full-profile red copper conformal cooling runners closely fit the contour of the product forming cavity, achieving ultra-fast uniform heat exchange compared to traditional straight drill cooling channels. The high thermal conductivity of copper eliminates localized hot spots on deep & curved plastic parts, drastically shortening molding cooling cycle time and reducing surface defects like sink marks, warpage and weld lines. Four-corner large mounting holes and distributed positioning bores are machined with tight positional tolerance, guaranteeing repeatable mold alignment during mass production.
Monolithic thick steel frame provides rigid anti-deformation support under high injection clamping pressure, while the copper inserts deliver exclusive thermal management performance without sacrificing mold structural strength.
Dual Composite Material Performance Advantage
The matched combination of 718H mold steel and C11000 red copper balances mechanical rigidity and heat dissipation capacity:
- 718H Pre-hardened Steel Frame: High toughness, wear resistance and stable dimensional rigidity to withstand long-term injection clamping impact; excellent polishability for glossy plastic product surfaces
- C11000 Red Copper Cooling Inserts: 8x higher thermal conductivity than mold steel, rapidly extracting heat from cavity surface to boost molding throughput by 20%-40%
- Interference press-fit assembly between steel and copper avoids water leakage under circulating cooling water pressure; matched thermal expansion minimizes gap deformation during temperature cycles Perfect for thin-wall electronic housings, large curved cosmetic casings and automotive interior plastic parts requiring high production efficiency and flawless surface quality.
Custom Thermal Mold Engineering Support
- Custom cavity contour, conformal copper cooling path, block outer dimensions and hole layout based on customer 2D/3D CAD drawings
- Optional surface upgrades: Mirror Polishing, Gas Nitriding, Texture Etching, Anti-Corrosion Passivation
- DFM thermal simulation consultation: cooling flow balance, heat dissipation optimization, shrinkage compensation design
- Fast prototype cavity sampling and mass batch production delivery
Key Features & Advantages
- Conformal Copper Cooling Design: Profile-following red copper runners realize full-cavity uniform heat dissipation, significantly cutting molding cycle time.
- Dual Material Composite Structure: Rigid steel body for structural strength + high-conductivity copper for temperature control, balancing durability and production efficiency.
- Defect Reduction Molding Performance: Eliminates hot spot-induced warpage, bubbles and sink marks to lower finished product reject rate.
- Precision Integrated Machining: 5-axis simultaneous machining ensures seamless fit between copper inserts and steel mold base without assembly gaps.
- Fully Customizable Cooling Layout: Tailor copper runner shape, channel diameter and cavity geometry to match unique product heat dissipation demands.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Mold Material | 718H Pre-Hardened Mold Steel |
| Heat Conduction Insert Material | C11000 Pure Red Copper |
| Alternative Materials | S136 Stainless Steel, Beryllium Copper BeCu |
| Hardness | HRC 28–32 (718H); HB 80–90 (C11000 Copper) |
| Dimensional Tolerance | ±0.002mm for cavity profile, hole position & block flatness |
| Flatness | ≤0.003mm per 100mm block length |
| Copper Surface Roughness | Ra ≤0.2μm Polished Finish; Steel Surface Ra ≤1.6μm Milled Matte |
| Manufacturing Processes | 5-Axis CNC Milling, Precision Boring, Copper Insert Press-Fitting, Deburring, Heat Treatment |
| Surface Treatments | Mirror Polishing, Gas Nitriding, Chemical Texturing, Anti-Rust Passivation |
| Customization | 100% Fully Customized via CAD Drawings & Physical Product Samples |
Applications
Consumer Electronics Thin-Wall Housings
Used as temperature-controlled cavity inserts for wireless earphone shells, charger casings and wearable device thin plastic frames. Copper conformal cooling eliminates thin-wall warpage and improves daily production output.
Automotive Interior Plastic Trims
Applied for injection molding of automotive dashboard covers, door handle housings and instrument panel plastic parts. Fast heat dissipation ensures consistent surface gloss on large curved automotive plastic components.
Cosmetic Packaging Shells
Ideal for cosmetic bottle outer casings, makeup tool plastic bases and perfume cap molds. Uniform cooling removes surface flow lines, reducing post-processing polishing workload for high-end cosmetic packaging.
Household Small Appliance Components
Suitable for blender housings, electric toothbrush plastic bodies and kitchen appliance structural parts. Shortened cooling cycle greatly improves mass production efficiency for consumer home goods.
Medical Plastic Consumables
S136 stainless steel mold frame variant meets hygiene standards, paired with beryllium copper inserts for medical device plastic shell molds, resisting corrosion from medical plastic additives while maintaining efficient heat dissipation.
