Home » Products » Industry » Precision Multi-Cavity Injection Mold for Plastic Spur Gears & Finished Gears

Precision Multi-Cavity Injection Mold for Plastic Spur Gears & Finished Gears

Our precision multi-cavity injection mold is exclusively engineered for manufacturing high-quality plastic spur gears, paired with finished gears (dual-color options available) that meet industrial-grade transmission requirements. As shown in the image, the mold integrates advanced unscrewing and core-pulling mechanisms, while the finished gears feature precise tooth profiles, robust structures, and excellent wear resistance—making them ideal for automotive, power tools, smart home, and industrial automation applications. We provide a one-stop solution, covering mold design, manufacturing, and finished gear injection, ensuring consistent precision, high production efficiency, and cost savings for global clients.
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  • yixun

  • yixunmold

Our precision multi-cavity injection mold is exclusively engineered for manufacturing high-quality plastic spur gears, paired with finished gears (dual-color options available) that meet industrial-grade transmission requirements. As shown in the image, the mold integrates advanced unscrewing and core-pulling mechanisms, while the finished gears feature precise tooth profiles, robust structures, and excellent wear resistance—making them ideal for automotive, power tools, smart home, and industrial automation applications. We provide a one-stop solution, covering mold design, manufacturing, and finished gear injection, ensuring consistent precision, high production efficiency, and cost savings for global clients.

Product Overview

This product combination includes two core components: a high-precision multi-cavity injection mold for plastic spur gears, and the finished spur gears produced by the mold (available in orange and black dual-color options). The mold is designed with dual-station/dual-parting surface structure, enabling simultaneous production of multiple gears in one molding cycle to maximize production efficiency. The finished spur gears, crafted from high-performance engineering plastics, integrate tooth profiles, reinforcing ribs, and mounting holes in one-piece injection molding, delivering superior mechanical strength, low-noise transmission, and long service life—replacing traditional metal gears in lightweight, cost-sensitive, and corrosion-resistant scenarios.

Key Features & Technical Advantages

Feature
Technical Details
Core Benefits
Precision Mold Structure
Multi-cavity design (2 cavities standard, customizable), dual-station/dual-parting surface; integrated unscrewing mechanism and hydraulic core-pulling system for gear demolding
Ensures no damage to gear teeth during demolding; enables high-efficiency mass production, reducing per-unit cost
Ultra-Precision Tooth Profile Control
Mold cavities machined by high-precision wire EDM and CNC; tooth profile tolerance up to DIN 5-7 (ISO 1328); shrinkage compensation designed based on material characteristics
Finished gears achieve smooth meshing, minimal backlash (<0.02mm), and low-noise transmission
Dual-Color Finished Gears
Orange: PA66+GF (glass fiber reinforced nylon); Black: POM (acetal) or flame-retardant PA; one-piece injection molding with integrated reinforcing ribs
Orange gears: high strength and wear resistance for heavy-load scenarios; Black gears: self-lubricating for high-speed, low-noise operation
Durable Mold Construction
Cavity/core: H13/SKD61 hardened steel (heat-treated to HRC 52-56); Mold base: S50C; mirror polishing (Ra ≤ 0.2μm) for cavity surfaces
Mold service life up to 500,000+ cycles; resistant to high pressure and high temperature during injection molding
One-Stop Solution
Integrated services: mold design, precision machining, mold testing, finished gear injection, and quality inspection
Simplifies supply chain, shortens lead time, and ensures consistent quality between mold and finished products

Technical Specifications

Parameter
Mold Specifications
Finished Gear Specifications
Custom Options
Type
Multi-cavity injection mold for spur gears
Plastic spur gears (internal/external teeth)
Helical/bevel/worm gears; 2K injection mold
Cavity Count
2 cavities (standard)
Matching mold cavity count
4-16 cavities for high-volume production
Material
Cavity/core: H13/SKD61; Mold base: S50C
Orange: PA66+GF; Black: POM/flame-retardant PA
PEEK, PPS, medical-grade plastics
Tolerance
Cavity tolerance: ±0.005mm
Tooth profile: DIN 5-7; Overall dimension: ±0.02mm
Custom tolerance for ultra-precision applications
Surface Finish
Mirror polishing (Ra ≤ 0.2μm)
Matte/textured finish; deburred tooth edges
Gloss finish, laser marking, custom textures
Cycle Time
30-45 seconds per cycle
Consistent with mold cycle time
Optimized to 25-35 seconds for high-volume runs
Certifications
ISO 9001, RoHS
ISO 9001, RoHS, REACH
FDA, USP Class VI (for medical applications)

Applications

Our precision mold and finished plastic spur gears are widely used in various industries that require high-precision, low-noise, and lightweight power transmission components:
  • Automotive Industry: Window regulators, seat adjustment motors, wiper motor reduction gears, HVAC blower components, and EV auxiliary powertrain parts

  • Power Tools: Transmission gears for electric drills, angle grinders, and cordless screwdrivers

  • Smart Home & Consumer Electronics: Drive gears for robot vacuums, electric curtains, camera lens adjustment mechanisms, and small household appliances

  • Industrial Automation: Small servo motor gears, reducer core components, conveyor system transmission parts, and pick-and-place robot gears

  • Medical Devices: Precision gears for diagnostic equipment, infusion pumps, and lab automation systems (available in medical-grade materials)

Manufacturing & Quality Assurance

We adhere to strict quality control standards throughout the entire production process, ensuring every mold and finished gear meets international precision requirements:
  1. Mold Design & Engineering: 3D CAD/CAM design with mold flow analysis (CAE) to optimize cavity layout, cooling system, and demolding mechanism; gear tooth profile simulation to ensure meshing performance.

  2. Precision Machining: High-speed CNC milling, wire EDM, and EDM sinking for mold cavity/core machining; precision grinding and polishing to achieve mirror surface finish and tight tolerances.

  3. Injection Molding: Servo-driven injection molding machines with closed-loop control for consistent material dosing and pressure; automated feeding and ejection systems to minimize human error.

  4. Quality Inspection:
    1. Mold: CMM (Coordinate Measuring Machine) inspection for cavity precision and dimensional accuracy.

    2. Finished Gears: Gear measuring machine to verify tooth profile, pitch, and backlash; tensile testing and wear testing to ensure material performance.

  5. Traceability: Full batch traceability for materials, mold production, and finished gear injection, providing complete quality documentation for clients.

Customization Capabilities

We specialize in OEM/ODM solutions to meet your unique project requirements, offering flexible customization for both molds and finished gears:
  • Mold Customization: Cavity count adjustment (2-16 cavities), gear type customization (spur, helical, bevel), unscrewing/core-pulling mechanism optimization, and mold material upgrade.

  • Finished Gear Customization: Gear size (module 0.2-3.0), tooth count, material selection, color customization, surface finish, and integrated structural design (reinforcing ribs, mounting holes).

  • Process Customization: Insert molding (metal hubs/shafts), overmolding for hybrid components, and post-processing services (laser marking, precision deburring).

Why Choose Our Precision Gear Mold & Finished Gears?

  • Precision Expertise: Decades of experience in designing and manufacturing precision gear molds, with tooth profile accuracy up to DIN 5 level, ensuring smooth and efficient power transmission.

  • One-Stop Service: From mold design, machining, and testing to finished gear injection, we simplify your supply chain, reduce communication costs, and shorten lead times.

  • Cost Efficiency: Multi-cavity mold design and automated production lines reduce per-unit costs, while high-quality materials and craftsmanship extend product service life, lowering long-term maintenance costs.

  • Global Compliance: Our products meet ISO 9001, RoHS, suitable for global markets, including Europe, America, and Southeast Asia.

  • Full-Scale Support: Our professional engineering team provides 24/7 technical support, from initial design consultation to after-sales mold maintenance and spare parts supply.

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