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Precision Injection Mold Cavity Insert Block
This square mold cavity block is fully 5-axis CNC precision machined from premium mold steel, integrated with complex contoured product forming cavity, cooling pin holes, and standardized mold mounting bolt holes. It acts as the core forming cavity component for plastic injection molding mass production.
- Material: P20 / 718H Mold Steel
- Hardness: HRC 28–32 (Pre-hardened)
- Tolerance: ±0.003 mm
- Surface Finish: High Polished Mirror EDM Finish
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High-Precision Mold Cavity Engineering
Integrated 3D contoured forming cavity adopts smooth transitional curved surface design to eliminate plastic flow marks, sink marks and weld lines during injection cycles. Strategically distributed cooling pin holes achieve uniform heat exchange across the entire molding surface, drastically shortening cooling cycle time. Standard large mounting through holes and small positioning holes are machined with ultra-tight positional tolerance to guarantee perfect mold alignment after repeated mold opening/closing.
Rigid monolithic square base structure resists clamping deformation under high injection pressure, delivering consistent dimensional stability for plastic finished goods in long-term continuous mass manufacturing.
Wear-Resistant Pre-Hardened Mold Steel Construction
Pre-hardened P20/718H mold steel provides outstanding comprehensive performance for injection mold cavity inserts:
- Balanced hardness & toughness, resistant to surface denting and long-term fatigue wear
- Superior polishability for mirror-grade cavity surface to produce glossy plastic parts
- Excellent thermal conductivity for uniform mold temperature control to reduce molding defects
- Easy subsequent surface upgrade: nitriding, PVD coating, texturing for extended service life Perfect for medium-volume injection molding of consumer goods, automotive plastic housings and electronic enclosures.
Custom Mold Engineering Support
- Custom block outer size, cavity contour, cooling circuit layout based on customer 2D/3D CAD drawings & physical samples
- Optional surface enhancement: Mirror Polishing, Texture Etching, Gas Nitriding, CrN Coating
- DFM mold flow analysis consultation for gate location, cooling layout & shrinkage compensation
- Fast prototype mold inserts and mass production batch delivery
Key Features & Advantages
- Complex Contour Precision: 5-axis simultaneous machining replicates intricate product geometry with ultra-high dimensional consistency.
- Uniform Cooling Design: Built-in distributed cooling holes balance mold temperature, cut cycle time and lower reject rate.
- Anti-Deformation Rigid Base: Thick square mold block withstands high injection clamping pressure without cavity distortion.
- Full Custom Mold Design: Zero fixed standard cavity profiles; tailor cavity shape, cooling circuits and mounting layout to your plastic product.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Mold Material | P20 / 718H Pre-hardened Mold Steel |
| Alternative Materials | S136 Stainless Mold Steel, H13 Hot Work Steel |
| Hardness | HRC 28–32 (As-delivered pre-hardened) |
| Dimensional Tolerance | ±0.003mm for cavity profile, hole position & block thickness |
| Flatness | ≤0.004mm per 100mm block length |
| Cavity Surface Roughness | Ra ≤0.02μm (Mirror Polished) |
| Manufacturing Processes | 5-Axis CNC Milling, Sink EDM, Wire EDM, Precision Drilling, Hand Polishing |
| Surface Treatments | Mirror Polishing, Chemical Texturing, Gas Nitriding, PVD Hard Coating |
| Customization | 100% Fully Customized via CAD Drawings & Product Samples |
Applications
Automotive Plastic Parts
Used as core cavity inserts for automotive interior plastic trim, small structural housings and light housing components. Uniform cooling eliminates warpage on large curved automotive plastic parts, ensuring stable mass injection molding output.
Consumer Electronics Enclosures
Serves as precision injection mold cavities for charger shells, Bluetooth speaker housings, remote control casings and wearable device plastic frames. High-gloss polished cavity delivers scratch-free glossy electronic appearance parts with minimal post-processing.
Daily Consumer Goods
Ideal for household plastic containers, cosmetic bottle shells, small home appliance plastic components and toy mold inserts. Balanced mold temperature reduces surface defects like bubbles and flow lines for high-quality consumer end products.
Medical Plastic Consumables
Adopt S136 stainless steel variant for medical disposable plastic parts (syringe housings, instrument casings). Corrosion-resistant mold steel avoids contamination during medical-grade plastic injection and meets hygiene production standards.
Industrial Automation Plastic Components
Applied to injection molding of sensor plastic housings, connector shells and small automation equipment structural plastic parts. Rigid anti-deformation mold block maintains precise part tolerances for industrial precision plastic components under long-cycle production.
