Our main grades of PEEK special engineering plastics include:
ARKPEEK-1000 (pure resin)
ARKPEEK-GF30 (30% glass fiber filled)
ARKPEEK-CF30 (30% carbon fiber filled)
ARKPEEK-MOD (10% carbon fiber + 10% graphite + 10% PTFE)
These profiles exhibit outstanding characteristics and advantages such as high-temperature resistance, wear resistance, hydrolysis resistance, chemical corrosion resistance, high strength, and self-lubrication. Due to these features, they also have good machining properties and can undergo processes like milling, turning, grinding, and planing. However, special engineering plastics differ from metallic materials and general engineering plastics in aspects like thermal expansion, heat dissipation performance, elasticity, and wear resistance. The following precautions are provided for reference during machining.
Tool Selection: Use sharp carbide tools or diamond tools. Avoid high-speed steel (white steel tools), as they lack the hardness and rigidity required for processing ARKPEEK-CF30.
Cooling: Apply coolant during processing to reduce wear and heat conduction.
Tool Maintenance: Ensure turning tools are sharp. Dull tools cause heating, leading to product cracking, rough surfaces, or poor dimensional accuracy.
Material-Specific Notes:
ARKPEEK-CF30 and ARKPEEK-GF30 are prone to tool wear and require frequent sharpening.
ARKPEEK-1000 has good toughness, but scraps are hard to break and should be cleaned promptly to avoid defects.
Use a small feed rate and sufficient coolant to prevent discoloration or yellowing due to excessive heat.
Prefer vertical milling cutters with a large rake angle, good chip conveyance, and sharp edges.
For ARKPEEK-CF30, diamond tools are recommended.
Control clamping force and method to minimize deformation after machining.
Use a turning tool or an electric woodworking circular saw. Avoid grinding wheel saw blades.
Maintain a moderate speed to prevent chips from melting and sticking.
Use coarse-tooth saw blades and apply cutting fluid or water cooling.
Tungsten carbide saw blades are wear-resistant and produce better finishes.
Use a small cutting amount and slow feed rate.
When inserting into the product edge, place ordinary plastic underneath to prevent bursting.
Material-Specific Note: ARKPEEK-CF30 is wear-resistant, so thread plugs wear quickly, increasing extrusion force and risking deformation or cracking.
Best Practices:
Use coolant or threading oil.
Prefer tungsten steel taps or high-hard alloy taps.
For deep holes, use segmented and multiple tapping operations.
Use a large-bubble grinding wheel to prevent plastic chips from adhering.
Change the cutting fluid frequently to maintain cleanliness and surface roughness.
Recommended grinding allowances:
Rough grinding: 0.1–0.5mm per pass.
Fine grinding: 0.05–0.1mm per pass.
Use a slower feed rate than for metal parts to reduce deformation and improve surface finish.
For processing large-sized rough bars with inner holes (e.g., rollers, bushings, coil frameworks):
Using oversized drill bits.
Insufficient chip removal during deep-hole drilling.
Inadequate cooling.
Fast feed rates.
Worn drill bits.
Residual stress in the rough bar.
Start with a small drill bit (<10mm), then ream incrementally with larger cutters.
Withdraw the drill bit frequently to remove chips.
Ensure sufficient cooling during drilling.
Reduce feed rates appropriately.
Regrind worn drill bits promptly.
Heat-treat processed profiles to reduce internal stress. For prone-to-crack products (e.g., large-diameter rods or thick plates), consider the "ARK's Hot Punching Process" (contact the company for details).
Due to internal stress, profiles may deform when machining special shapes (e.g., U-shaped parts). Leave machining margins for finish machining or divide machining allowances evenly for forward and reverse machining.
Clamping: Use open sleeves, core rods, spring clamps, or clamp plate tools to avoid deformation.
Cutting Parameters:
Reduce rake feed and cutting speed.
Increase rake angle and secondary inclination angle to enhance tool sharpness, reduce friction, and minimize deformation.
Use a moderate tip radius for the cutter to balance surface roughness and heat dissipation.
Inclination Angle:
Increase the main inclination angle to reduce back force and deformation.
Use drill bits <10mm in diameter and drill from both ends with sufficient coolant.
Ensure drill bits are sharp and free of damage.
For bars with significant internal stress, heat-treat profiles to minimize cracking risks.
Please CONTACT us asking for PEEK MACHINING NOTES PDF.
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