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| Customization: | Available |
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| Material: | PP |
| Application: | Medical, Household, Electronics, Automotive, Agricultural |
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Mold Material
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Aluminum,45#, P20, H13, 718, 1.2344, 1.2738 and so on
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Plastic Material
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PC/ABS, ABS, PC, PVC, PA66, POM or other you want
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silicon rubber Material
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NR, NBR, SBR, EPDM, IIR, CR, SILICONE,etc
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Plastic Surface finish
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Polishing finish,Texture Finish,Glossy Finish,Painting,Slik print,Rubber Painting etc
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Drawing format
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IGES, STEP, AutoCAD, Solidworks, STL, PTC Creo, DWG, PDF, etc..
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The Way of Color Contrast for Plastic
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RAL PANTONE
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Certificated
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ISO 9001:2008 Certificated, SGS Certificated
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Service Project
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To provide production design, production and technical service, mould development and processing, product assembly and packaging,etc
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1.Product Design,Structural Optimization,Process Optimization
2.Mold Making,Plastic Molding Parts,Casting Parts,Machining Part
3.Manage Project,Control The Delivery and Quality of Products
4.Arranging the Transportation,Customs Clearance and other Matters for You.
1. Competitive price.
2. Strict quality control system.
3. Quick mold making and delivery.
4. Advanced equipment, excellent R&D teams.
5. Professional technicians and rich experienced workers.
We can offer the full range of service from mold designing, making, plastic part molding to printing,
assembly, package, and shipping arrangement.
Quality First,Price Best,Service Foremost!
1. What are the advantages of plastic gears over metal gears?
Lightweight: Reduce inertia and energy consumption.
Corrosion Resistance: Ideal for wet, humid, or chemically exposed environments.
Quiet Operation: Dampen vibration and reduce noise.
Cost-Effective: Lower material cost and often produced via injection molding for high volumes at low unit cost.
Self-Lubrication: Many plastics have inherent lubricity, reducing or eliminating the need for external lubricants.
Design Flexibility: Complex geometries (like hubs and spokes) can be molded as one part.
2. What are the limitations of plastic gears?
Lower Strength & Load Capacity: Compared to metals, they handle lower torque and are more susceptible to impact failure.
Temperature Sensitivity: Performance degrades at high temperatures; continuous use temperature is limited.
Creep & Dimensional Stability: Under constant load, plastics can deform over time.
Thermal Expansion: Higher coefficient of thermal expansion than metal, which must be accounted for in design.
3. What are the most common materials for plastic gears?
Nylon (PA 6, PA 66, PA 12): Excellent wear resistance, toughness, and fatigue resistance. Often reinforced with glass fibers. May absorb moisture.
(POM / Delrin®): High stiffness, low friction, excellent dimensional stability, and moisture resistance. A top choice for precision gears.
Polycarbonate (PC): High impact strength and transparency, but poor chemical resistance to some solvents.
Polyester (PBT, PET): Good chemical resistance, low moisture absorption, and dimensional stability.
Polyurethane (PU): High resilience and abrasion resistance, used in high-wear situations.
Polyphenylene Sulfide (): High-temperature resistance and chemical inertness.
4. When should I consider glass-filled plastic for gears?
Glass fibers (typically 10%-30%) significantly increase stiffness, strength, and heat deflection temperature. Use them for higher-load applications. However, they increase wear on mating gears and mold tools, and can reduce some impact toughness.
5. Can plastic gears mesh with metal gears?
Yes, this is very common. A plastic gear meshing with a well-finished metal gear (often steel or brass) is an excellent combination. The metal gear provides strength and heat dissipation, while the plastic gear reduces noise and weight. Ensure the metal gear has a smooth surface finish to minimize wear on the plastic.
6. What are the key design considerations for plastic gears?
Tooth Profile: Involute is standard. Modifications like tip relief are often needed to compensate for molding shrinkage and deflection.
Root Fillet: Generous fillets reduce stress concentration.
Hub, Web, and Rib Design: Must balance material savings with strength and minimize sink marks that affect tooth geometry.
Molding Gate Location: Critical to ensure uniform filling and minimize warpage in the gear teeth.
7. Why are plastic gears often designed with a larger backlash than metal gears?
To accommodate thermal expansion and moisture absorption, which can cause dimensional changes. Proper backlash prevents binding, especially in temperature-varying environments.
8. How do I calculate the load capacity of a plastic gear?
It's complex and should be done with engineering software or consultation. Key factors include: material flexural strength & fatigue data (S-N curves), operating temperature, speed, lubrication, and mating surface. Always apply a significant safety factor.
9. What manufacturing processes are used for plastic gears?
Injection Molding: The standard for high-volume production of net-shape gears.
CNC Machining: Used for prototypes, low volumes, or gears where molding tooling is not justified.
Hobbing & Gear Shaping: Less common for plastics, but used for large gears or specific materials.
10. What tolerances can I expect with molded plastic gears?
Typical AGMA tolerances for molded gears are AGMA Class 5 to 8. Precision molded gears can achieve Class 5 or better. Tighter tolerances (like AGMA Class 3-4) usually require post-molding machining and come at a higher cost.
11. Do plastic gears require lubrication?
Many applications run dry. Materials like and nylon have good inherent lubricity.
Lubrication can extend life in high-load, high-speed, or high-temperature applications. Use compatible lubricants (silicone-based, PFPE) that won't degrade the plastic. Avoid petroleum-based greases with some plastics like polycarbonate.
12. What are common failure modes for plastic gears?
Tooth Breakage/Bending: From overload or impact.
Wear & Abrasion: From friction, contaminated environments, or meshing with a rough surface.
Pitting/Fatigue: From repeated cyclic loading.
Melting/Heat Distortion: From overload, high speed, or insufficient cooling.
13. Can you provide custom plastic gear design and molding?
Yes. We specialize in custom gear design for your application. Our process includes application analysis, material selection, precision mold design, and full production. Contact our engineering team with your requirements (load, speed, life, environment).
14. What information do you need to provide a quote for custom plastic gears?
Please provide:
Drawings or specifications (module/diametral pitch, number of teeth, face width, bore size, hub details).
Application details (torque, RPM, duty cycle, mating gear material).
Operating environment (temperature, chemicals, moisture).
Annual volume estimate.
Any performance standards (AGMA, etc.) that must be met.
15. Do you offer prototyping services?
Yes. We offer rapid prototypes via CNC machining or low-volume injection molding using soft tooling to validate design, fit, and function before committing to production hard tooling.
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