POM CNC Machining: Acetal Plastic Guide

This pom acetal polyoxymethylene guide explains practical material, design, manufacturing, and sourcing considerations for Nylon Plastic readers.

POM acetal rods, gears and machined stock in a CNC plastics workshop — POM (ацеталь, полиоксиметилен) — Полное руководство по ЧПУ-обработке пластиков

Что такое ацетальный пластик POM?

POM acetal CNC machining line with polymer pellets and finished precision components — Профессиональная промышленная фотография: POM (ацеталь, полиоксиметилен), производство

POM (полиоксиметилен), также известный как ацеталь или Делрин, представляет собой высококристаллический инженерный термопласт. Сочетание высокой жесткости, низкого коэффициента трения и превосходной стабильности размеров делает его идеальным материалом для изготовления прецизионных механических деталей.

Основные свойства POM

Прочность на разрыв: 60–70 МПа
Модуль упругости при изгибе: 2 500–2 800 МПа
Температура плавления: 165–175 °C
Коэффициент трения: 0.2–0.35

Передовые методы обработки на станках с ЧПУ

Используйте острые твердосплавные инструменты, скорость резания при токарной обработке 150–250 м/мин, а также струйное или обливное охлаждение.

Общие приложения

Шестерни, звездочки, подшипники, втулки, направляющие, оборудование для пищевой промышленности и компоненты медицинского оборудования.

POM CNC Machining: What the Shop Must Control

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
Зажимные приспособления	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.

Prototype-to-Production Questions

Will the final part stay CNC machined, or will volume justify an injection mold?

Which dimensions must be checked after the part is released from the fixture?

Does the application need dry running, chemical exposure or repeated wear testing?

Is the requested tolerance functional, or is it being copied from a metal-part drawing?

Часто задаваемые вопросы

When is POM acetal a good choice for a CNC-machined plastic part?

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.

What should be checked before choosing POM for CNC machining?

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.

How should POM be held during machining?

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.

What affects the cost of POM CNC machining?

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.

Can POM be replaced by nylon or PA-GF20?

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.

Request a POM CNC Machining Review

Send the CAD file, drawing, POM grade preference, tolerances, operating environment, quantity and inspection requirements for a machining review.