This pom acetal polyoxymethylene guide explains practical material, design, manufacturing, and sourcing considerations for Nylon Plastic readers.
POM（ポリオキシメチレン）は、アセタールまたはデルリンとも呼ばれる、結晶度の高いエンジニアリング熱可塑性樹脂です。高い剛性、低い摩擦係数、そして優れた寸法安定性を兼ね備えているため、精密機械部品の材料として最適です。.
切れ味のよい超硬工具を使用し、旋削時の切削速度は150～250 m/minとし、エアブローまたはフルードクーラントを用いる。.
歯車、スプロケット、ベアリング、ブッシング、ガイドレール、食品加工機器、および医療機器の部品。.
POM is easy to machine compared with many reinforced engineering plastics, but it still needs a controlled process. The stock should be supported evenly, the workholding should not crush thin sections, and the tool path should remove heat instead of rubbing the polymer. A part that measures correctly while clamped can move after release if the stock or fixture has stored stress.
| Control point | Why it matters | Useful RFQ evidence |
|---|---|---|
| Stock and grade | Different POM grades can vary in stiffness, friction, color and dimensional behavior | Grade, certificate, stock size and lot traceability |
| ワーク保持 | Uneven clamp force can distort thin walls and bores | Fixture concept, datum plan and relaxed-part inspection method |
| Cutting strategy | Rubbing and trapped chips can raise heat and damage the surface | Tool material, chip evacuation and critical surface requirement |
| Inspection condition | Temperature and release state can change the measured result | Inspection temperature, datum scheme and critical dimensions |
For a production decision, compare CNC-machined POM with molded POM, unfilled PA, PA-GF20 and PA-CF30 only against the actual duty cycle. POM is often attractive for low-friction parts, while reinforced nylon may be better when stiffness, wear or temperature response dominates. A material substitution should be validated with the mating component and service environment.
POM is useful when low friction, good stiffness, wear resistance and dimensional stability are more important than high temperature or long-term moisture resistance. Confirm the load, speed and chemical environment first.
Check part size, wall thickness, tolerance, surface finish, heat exposure, load direction, friction, chemical contact and whether the design will remain machined or later move to injection molding.
Use even support and moderate clamping force. Excessive local pressure can distort the stock and the part can move when released, so critical dimensions should be inspected after the part has relaxed.
Cost depends on stock size, material grade, number of setups, tool access, tolerances, surface finish, inspection and quantity. Standard tools and relaxed non-critical tolerances usually reduce cost.
Sometimes, but the replacement changes friction, moisture response, stiffness, wear and dimensional behavior. Compare the application data rather than substituting by name alone; PA-GF20 may improve stiffness but can change anisotropy and surface behavior.
Send the CAD file, drawing, POM grade preference, tolerances, operating environment, quantity and inspection requirements for a machining review.
