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2025

Plastic CNC Machining Must-Read: Process Adaptation Guide for ABS, POM, PEEK Materials

In plastic CNC machining, ABS requires crack prevention and burr control, adapting to general tools and medium-high speeds, suitable for low-cost general parts; POM needs to solve tool sticking and heat shrinkage, using coated tools and oil cooling, suitable for precision transmission parts; PEEK requires special tools and high-pressure cooling to overcome difficult cutting, suitable for high-end high-temperature scenarios. Adapting processes to material properties is key.

ABS, POM, and PEEK are the three most widely used materials in plastic CNC machining. However, improper process adaptation can lead to part scrapping or performance failure. An electronics factory used parameters for ABS to cut POM, and due to uncontrolled shrinkage, the dimensional deviation of 100 housings exceeded 0.2mm; another medical equipment factory did not use special tools when machining PEEK parts, resulting in a surface roughness Ra of 3.2μm, which failed to meet aseptic requirements. The three types of materials have significant differences in properties, requiring targeted optimization of four process links: "tool selection, cutting parameters, cooling method, and precision control".​

1. ABS: Low-Cost General-Purpose Plastic, Focus on "Crack Prevention + Burr Control"​

ABS has a density of 1.05g/cm³, good toughness but low heat distortion temperature (80-100℃), and is prone to cracking and burrs during machining:​

Tool Adaptation: Use high-speed steel (HSS) or cemented carbide (WC) end mills with sharp cutting edges (to avoid extrusion cracking), and a tool rake angle of 15°-20°;​

Cutting Parameters: Spindle speed 3000-6000rpm, feed rate 500-1500mm/min, depth of cut ≤2mm (to prevent softening caused by concentrated cutting heat);​

Cooling and Deburring: Use compressed air for cooling (to avoid part deformation due to water absorption from water cooling). After machining, manually remove edge burrs with sandpaper, which is 30% less efficient than CNC deburring but lower in cost;​

Typical Scenarios: Electronic housings, toy parts, home appliance accessories. A home appliance factory used this process to machine ABS washing machine panels, increasing the yield rate from 85% to 98%.​

2. POM: High-Rigidity "Steel-Like" Material, Solving "Heat Shrinkage + Tool Sticking" Problems​

POM has a density of 1.42g/cm³, high hardness (Rockwell hardness R118) but is prone to tool sticking and high heat shrinkage (1.5%-3%) during machining, which is a common pitfall for beginners:​

Tool Adaptation: Prioritize coated tools (e.g., TiAlN coating) to reduce tool sticking, and a tool relief angle of 8°-12° (to reduce frictional heat generation);​

Cutting Parameters: Spindle speed 2000-4000rpm, feed rate 300-1000mm/min, which needs to be 30% lower than that of ABS (to avoid part deformation caused by overheating);​

Cooling and Precision Control: Use oil-based cutting fluid for cooling (to enhance lubricity and reduce tool sticking). After machining, the part needs to be left to stand for 24 hours (to release internal stress and compensate for shrinkage). A gear factory improved the precision of POM gears from IT8 to IT7 through this method;​

Typical Scenarios: Precision gears, bearings, valve parts. Due to its good wear resistance, it is often used to replace metal for manufacturing transmission components.​

3. PEEK: High-Performance High-Temperature Resistant Plastic, Overcoming "Difficult Cutting + High Cost" Challenges​

PEEK has a density of 1.32g/cm³, high temperature resistance (long-term service temperature 260℃), and strong corrosion resistance, but high material cost (about 800 yuan/kg) and high cutting difficulty, resulting in heavy losses from machining errors:​

Tool Adaptation: Must use ultra-fine grain cemented carbide tools or diamond tools, with a tool edge roughness Ra ≤0.02μm (to ensure machining surface quality), and the tool life is only 1/5 of that for machining ABS;​

Cutting Parameters: Spindle speed 1500-3000rpm, feed rate 200-600mm/min (low-speed machining to reduce tool wear), depth of cut ≤1mm (to avoid tool overload);​

Cooling and Cost Control: Use a high-pressure cooling system (pressure 10-15MPa) to remove cutting heat and protect tools. For small-batch machining (≤50 pieces), it is recommended to adopt the "trial cutting first, then batch machining" mode. An aviation factory reduced the rework rate of PEEK parts from 20% to 3% through this mode;​

Typical Scenarios: Aerospace components, medical implants, high-end electronic connectors. A medical enterprise used PEEK to machine artificial joints and met biocompatibility requirements through process optimization.

Key words:

Plastic CNC machining guide,ABS CNC processing parameters,POM tool selection,PEEK high-pressure cooling,plastic CNC precision control,medical grade PEEK machining,plastic CNC burr control,high-temperature plastic machining

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