FRP Hexagonal Rod Pultrusion Mould
This FRP pultrusion mould produces profiles including flat strip, rod, hexagonal rod, round tube, rectangular tube, beam, frame, and more. It’s mounted on the pultrusion machine, where fiber roving and resin are drawn continuously through the die to form the profile.
Executive standard
Straightness: 0.02mm Smoothness: Ra=0.025~0.012 Cavity surface hardness: < 0.02mm Boundary tolerances: ±0.3mm Plating thickness: 0.04-0.05mm Provide Customized Services
FRP Hexagonal Rod Pultrusion Die is precision tooling used to shape FRP (Fiber Reinforced Plastic) tube. The pultrusion process pulls resin-saturated fiber continuously through a heated die, forming a continuous profile with a fixed cross-sectional shape and size. FRP tube offers a favorable strength-to-weight ratio along with corrosion resistance, electrical insulation, and fire retardance, which is why it is widely used across the power, chemical processing, construction, and transportation industries.
How FRP Hexagonal Rod Pultrusion Die Works
1. Glass fiber, carbon fiber, or another reinforcement is drawn off the creel and guided into the resin bath for impregnation.
2. The resin-saturated fiber then passes through a preformer that shapes it into the target profile before it enters the die.
3. Inside the heated die, the fiber is subjected to heat and pressure as the resin turns from liquid to gel and finally cures into a rigid composite.
4. A pulling unit draws the cured FRP profile out of the die, after which a cut-off saw trims it to the required length.
What Determines FRP Hexagonal Rod Pultrusion Die Performance and Parameters
Fiber reinforcement: The type and content of fiber used affects the finished profile’s strength, stiffness, and weight — generally, a higher fiber content means greater strength and less weight. Glass fiber, carbon fiber, and aramid fiber are the reinforcements most commonly used.
Resin system: The resin type and mix ratio determine chemical performance, including heat resistance, corrosion resistance, and resistance to aging; a more stable resin formulation generally means better durability. Polyester, vinyl ester, and epoxy resins are the systems most often specified.
Die design: The shape and size of the die set the profile’s cross-section and dimensions, as well as forming speed and quality. A more precisely made die generally produces more uniform parts and higher output efficiency.
Pultrusion Die Parameters and Execution Standards
| Mold name | FRP Hexagonal Rod Pultrusion Mold |
| Specification | 3~32mm (Can be customized) |
| Material | 40Cr, P20, Cr12, 38CrMoAI, H13 (optional) |
| Cavity Surface Treatment | Quenching and tempering, quenching, hard chrome plating, nitriding |
| Cavity hardness | HRC55-60 |
| Applicable resin | Unsaturated polyester, vinyl resin, epoxy resin, phenolic resin, polyurethane |
| Straightness | 0.02mm |
| Smoothness | Ra=0.025~0.012 |
| Cavity surface hardness | < 0.02mm |
| Boundary tolerances | ±0.3mm |
| Plating thickness | 0.04-0.05mm |
Tooling Specifications & Engineering Insights
| Die Steel Grade Material | H13 Tool Steel (Premium) | Cr12MoV Die Steel (Standard) | P20 Mold Steel (Economical) |
|---|---|---|---|
| Core Working Lifespan | Excellent (Over 50,000+ meters with fiberglass) | High (Around 30,000 – 40,000 meters) | Moderate (Best for short-run prototyping) |
| Thermal Fatigue Resistance | Ultra-High (Maintains HRC hardness at high temperature) | Moderate (Good for polyester matrices) | Poor (Prone to dimensional wear under continuous PU) |
| Internal Mirror Polish Cap | Perfect (Achieves Ra 0.012 μm easily) | Excellent (Achieves Ra 0.025 μm) | Standard (Achieves Ra 0.040 μm) |
| Best Application Profiles | hexagonal rod runs requiring maximum tool life and dimensional stability | Standard-volume hexagonal rod production | Low-volume prototyping or trial runs of hexagonal rod |
Precision Mold Engineering Q&A
Q1: Why is a 0.04-0.05mm hard chrome plating thickness critical for Frp Hexagonal Rod Pultrusion Mould?
Answer: Glass fiber rovings and mats are highly abrasive. During continuous pultrusion, the reinforced matrix creates significant scratching friction against the cavity walls of Frp Hexagonal Rod Pultrusion Mould. A precise 0.04-0.05mm hard chrome layer raises surface micro-hardness and protects the underlying tool steel, extending die lifespan by over 40% while maintaining consistent hexagonal rod geometry run after run.
Q2: How does internal mirror polishing to Ra 0.012-0.025 μm affect pull force on Frp Hexagonal Rod Pultrusion Mould?
Answer: A mirror-polished cavity dramatically reduces the dynamic coefficient of friction inside the hexagonal rod shaping channel. Lower friction means the pultrusion machine needs less clamping/traction force to advance the curing composite, which cuts down on line stiction, prevents surface fiber blooming, and reduces energy consumption over long production runs.
Q3: Which steel grade should be specified for high-volume production with Frp Hexagonal Rod Pultrusion Mould?
Answer: For high-volume, continuous manufacturing, H13 tool steel or Cr12MoV die steel is recommended. H13 delivers the longest working lifespan and best thermal fatigue resistance, while Cr12MoV offers strong performance at a lower cost for standard-volume runs — P20 mold steel remains a cost-effective option for prototyping or short trial batches.
Q4: Can Frp Hexagonal Rod Pultrusion Mould be customized to non-standard dimensions or OEM specifications?
Answer: Yes. As with all our pultrusion tooling, dimensions, cavity count, and surface treatment can be engineered to your exact drawing or sample — our in-house CNC mold fabrication team supports both standard catalog sizes and fully custom OEM tooling requests.
Q5: Which resin systems is Frp Hexagonal Rod Pultrusion Mould compatible with?
Answer: The die is compatible with the full range of resin systems used in FRP pultrusion, including unsaturated polyester, vinyl ester, epoxy, and phenolic resins. Let us know your target resin and cure profile and we can confirm the optimal cavity finish and heating zone setup.
Production Process
Engineer mould design
Profile mould debugging
Rough embryo leveling
Mold CNC machining
Mould punching
Surface grinding
Cavity inner wall polishing
Mold chrome
