1. Product Overview
This plastic worm injection mold is tailor-made for mass production of precision PA66 worm gear parts. Designed with 1×4 cavity layout, the injection mold delivers four finished worm pieces per single shot, greatly boosting production efficiency for gear component orders. Adopting professional pin-point gate system, the injection mold realizes automatic gate separation after ejection, saving post-processing gate cutting labor cost.
Core and cavity of the injection mold are manufactured from premium 2344 hot work mold steel, heat-treated to hardness HRC48~52, featuring outstanding wear resistance and anti-fatigue performance for long-term continuous PA66 molding. Mold surface is finished with standard SPI-B2 texture, forming uniform fine matte appearance on PA66 worm surface while hiding minor molding marks. Optimized flow path balances PA66 melt filling, effectively controls shrinkage, warp and flash common on nylon worm products. This custom injection mold is widely applied for small worm gears used in auto accessories, household appliances, gear motors and precision transmission assemblies.
2. Core Mold Specification List
Cavity layout: 1×4 Cavity (4pcs per molding cycle)
Mold steel grade: 2344 hot work steel
Heat treatment hardness: HRC 48–52
Gate type: Pin-point gate (submarine pinpoint gate)
Surface finish: SPI-B2 standard mold texture
Applicable plastic: PA66 (Nylon 66, with/without glass fiber filled)
Molded part: Custom precision plastic worm / miniature worm gear
Production type: Continuous automatic mass injection molding
3. Key Design Advantages of This Plastic Worm Injection Mold
① 1×4 Multi-cavity Efficient Structure
Four identical cavities are arranged with balanced runner layout inside the injection mold, ensuring consistent melt pressure and filling speed for every single worm. All finished PA66 worms keep identical tooth precision, dimension weight and surface quality, ideal for bulk-volume gear production.
② Pin-point Gate for PA66 Worm Molding
Pin-point gate is the optimal feeding solution for slender worm parts of the injection mold. Tiny gate mark stays at non-critical surface of worm; gates snap off automatically during part ejection without manual trimming. It avoids large gate residue damaging worm tooth profile and guarantees complete tooth forming for PA66 material.
③ 2344 HRC48-52 High Hardness Mold Core
After precise quenching and tempering, 2344 steel reaches HRC48-52 hardness. PA66 especially GF-filled PA66 has strong abrasion to mold cavity; high-hardness mold steel effectively resists tooth cavity wear, keeps worm tooth precision stable over millions of shots and extends the injection mold service life significantly.
④ SPI-B2 Uniform Matte Surface
SPI-B2 fine texture treatment on the injection mold brings consistent matte finish on PA66 worm surface, improves wear resistance of finished worm gear and covers slight flow line defects generated during nylon molding.
⑤ Optimized Runner for PA66 Shrinkage Control
Runner size is customized matching PA66’s high shrinkage feature. Sufficient packing pressure eliminates sink mark and dimensional deviation on worm tooth and outer diameter, stabilizing assembly tolerance of finished transmission worms.
4. Application Range of Molded PA66 Worm Parts
Components molded by this injection mold are commonly used for miniature transmission structures: small gear reducer, home appliance motor drive, automotive fine transmission parts, electronic lock gears and office equipment transmission worm assemblies.
5. FAQ
Q1: What benefits does pin-point gate bring to PA66 worm mold?
A1: Pin-point gate auto breaks off when ejecting finished PA66 worms, no extra gate cutting work. Small gate position won’t destroy worm tooth precision and improves product appearance consistency.
Q2: Why select 2344 steel with HRC48-52 for PA66 worm injection mold?
A2: Glass fiber filled PA66 causes heavy abrasion to mold tooth cavity. HRC48-52 hardened 2344 steel has excellent wear resistance, prevents fast tooth cavity wear and maintains long-term stable worm dimensional accuracy.
Q3: What is SPI-B2 texture used on this plastic worm mold?
A3: SPI-B2 is industry-standard fine matte mold finish, producing uniform non-gloss surface on PA66 worm, optimizing wear performance and covering tiny molding surface flaws.
Q4: Can we customize different worm modulus and size on this injection mold?
A4: Yes, we provide full customization service. We adjust cavity tooth modulus, outer diameter, length and surface texture of the injection mold strictly based on clients’ 2D drawings or sample requirements.
Q5: Does this mold support glass-filled PA66 material?
A5: This 2344 high-hardness injection mold is specially designed for both unfilled and GF20~GF30 filled PA66, suitable for high-strength worm gear mass production.
Q6: Is it possible to change cavity quantity from 4 cavities to 1/2/8 cavities?
A6: Sure, we revise mold layout as per your order volume; single cavity for prototype trial and multi-cavity for large-batch mass production are both available.
