Product Description
●Product Introduction
The POM (Polyoxymethylene) ball screw assembly is a precision transmission component consisting of a POM engineering plastic ball nut paired with a metal screw shaft. Its core function is to convert rotational motion into high-precision linear motion, suitable for mechanical systems requiring low friction, low noise, and high wear resistance. POM material—known for its exceptional self-lubrication and dimensional stability (commonly called "acetal resin" or "steel substitute")—is an ideal replacement for metal ball nuts, particularly in lightweight and corrosion-resistant applications.
●Key Features
Low Friction & High Wear Resistance
Dynamic friction coefficient as low as 0.10–0.25 (paired with steel), with 40% less wear than standard POM. Operates lubrication-free, reducing maintenance.
Modified POM with solid lubricants enhances limiting PV value for high-speed sliding.
High Rigidity & Dimensional Stability
Flexural modulus of 2,200–3,800 MPa, comparable to aluminum alloys; 24-hour water absorption rate ≤ 0.15–0.3%. Dimensional change <0.08% in humid environments ensures long-term accuracy.
Fatigue & Creep Resistance
-
95% fatigue strength retention after 10⁷ cyclic load tests. Excellent creep resistance for high-frequency transmission.
Environmental Adaptability
Operating temperature range: -40°C to 100°C (short-term tolerance up to 160°C). Resists oils, solvents (weak acids/alkalis), but avoid strong oxidizers.
●Application Scenarios
Precision Industrial Equipment: CNC machine guideways, 3D printer lead screws, robotic arms (±0.05mm positioning accuracy).
Automotive Components: Fuel pump gears, seatbelt buckles, power seat adjusters (passes 100,000-cycle endurance tests; wear <0.1mm).
Electronics: Printer cams, 5G connector brackets (low dielectric loss <0.5% ensures signal stability).
Food/Medical Devices: FDA/EU food-contact compliant; used in conveyor rollers and medical instrument screws (withstands 1,000-hr salt spray).
●Selection & Processing Notes
Material Types: Homopolymer POM offers higher rigidity/wear resistance; Copolymer POMexcels in impact resistance.
Processing: Injection molding temperature must be strictly controlled at 185–210°C (avoid >220°C decomposition). Mold temperature: 70–100°C with medium-high pressure packing to minimize shrinkage.
This assembly leverages POM’s "steel-like" properties, combining self-lubrication and long-life design to deliver lightweight, low-noise, maintenance-free solutions for precision transmission systems.
