10 Years China PEEK Manufacturer
For our PEEK seals, we can process them according to the drawings you provide. We can guarantee the accuracy of the production for sealing rings ranging from small gaskets to large ball valve seats.
In PEEK modified materials, we can customize carbon fiber reinforcement and glass fiber reinforcement. Other materials can meet your customization requirements.
At the same time, we can produce PEEK Machined products. All you need to do is provide us with the product drawings and quantities we require to obtain the quotation.
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PEEK & PEEK Reinforced Material Introduction |
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| Virgin PEEK |
Good toughness and impact resistance. It can be disinfected using steam, ethyl alcohol and Y rays,etc. It has been widely used in medical,pharmaceutical and food processing industry. |
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CF PEEK
(Carbon fiber filled )
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The carbon fiber reinforced plastic have excellent elastic modulus,mechanical strength and creep resistance and wear resistance. |
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GF PEEK
(Glass fiber filled )
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Glass fiber reinforced PEEK. It has an extraordinary rigidity,creep resistance and dimensional stability. It can sustain constant load for a long time under high temperature. It is a ideal material to be used in structural parts. |
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FC PEEK
(PTFE+Carbon fiber+Graphite filled )
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It is a compound filled with PTFE,graphite and carbon fiber,It is the ideal material that can be used in the friction range with their low coefficient of friction and wear resistance. |
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FE PEEK
(PTFE20%+PEEK )
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Adding a certain proportion of PTFE increases the wear resistance of PEEK and has a low friction coefficient. |
Machining
The following are machining guidelines for PEEK material parts, focusing on material characteristics and best practices. This includes detailed analysis from aspects like material properties, clamping methods, tool head materials, cutting parameters, machining processes, material deformation, and stress relief.
PEEK is a high-performance engineering plastic with excellent comprehensive properties, but it is prone to deformationduring machining. Strict control of material handling and process parameters is essential to ensure workpiece quality.
1.Material Properties Analysis
PEEK is a semi-crystalline thermoplastic engineering plastic, and its characteristics directly affect the machining processand outcomes:High-Temperature Performance: Melting point is around 343°C, and continuous service temperature can reach 250°C.Mechanical Properties: High tensile strength, wear resistance, and self-lubricating properties make it suitable for high-load applications, but a large thermal expansion coefficient can lead to thermal stress during processing.
Chemical Stability: It is resistant to chemical corrosion and radiation, maintaining stability in oils, acids, and bases.
Influencing Factors: As crystallinity depends on the heating process, precise control of processing parameters is needed to avoid stress deformation.
Influencing Factors: As crystallinity depends on the heating process, precise control of processing parameters is needed to avoid stress deformation.
2.Clamping Method
Improper clamping can lead to workpiece deformation or damage. Low-stress and uniform support methods should be employed:
Specialized Fixture Design: Preferably use custom tooling fixtures (such as vacuum suction cups or flexible clamping systems) to avoid direct pressing that can concentrate force and cause local deformation.
Clamping Principles: Use a light clamping force to ensure the workpiece is evenly stressed; for thin plates, add cushioning materials (like rubber pads) to prevent scratches and stress concentration.
Position Optimization: Fixed points should be located in rigid areas of the workpiece, away from edges or thin walls; dynamic clamping systems (like rotating fixtures on machining centers) are suitable for complex geometries.
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Methods
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Applicable Scenarios
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Control Points
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Vacuum Suction Cups
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Thin sheets / Precision flat workpieces
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Suction force ≥ 0.08 MPa, edge sealed with silicone strips
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Soft Jaw Chucks
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Shaft-like / Rotating body workpieces
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Clamping force ≤ 5 N/mm² to avoid plastic deformation
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Shaped Fixtures
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Irregular structural components
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Fixture tooling must match the contour of the workpiece
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Adhesive Bonding
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Small quantities of special shapes
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Pay attention to the adhesive bonding strength, usage quantity, and difficulty of removal
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3.Tool and Drill Bit Materials
Choose high-hardness and wear-resistant materials to reduce tool wear and thermal impact:
Tool Materials: Recommended hard alloy or PCD (Polycrystalline Diamond) tools, with the latter being more wear-resistant and longer-lasting; coated tools (such as TiN-coated) can reduce friction.
Drill Bit Materials: Use PCD or hard alloy drill bits to ensure sharp cutting edges; high-speed steel drill bits wear out easily and are not suitable for continuous processing.
Geometric Parameters: Select sharp main clearance angles and positive rake angles (main clearance angle of 10-15°) to reduce cutting resistance; drill bit tip angle should be 118° to 135°, with a spiral angle of 30° for smooth chip removal.
4.Cutting Parameter Optimization
Controlling cutting parameters is key to preventing deformation and improving surface quality, and adjustments should be made based on actual working conditions.
| Process |
Cutting Speed vc
(m/min)
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Feed f
(mm/rev)
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Depth of Cut ap
(mm)
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| Rough Machining | 80-110 | 0.15-0.20 | ≤1.5 |
| Semi-Finishing | 120-150 | 0.08-0.12 | ≤0.8 |
| Finishing | 180-220 | 0.03-0.06 | ≤0.3 |
| Golden Rule: For carbon fiber reinforced PEEK: Reduce speed by 20% and feed by 30%. | |||
The above parameters are for reference only. Actual processing should take into account factors such as machine material,
tools, and the geometric features of the workpiece.
Cooling Method: Prefer neutral water-based solutions as cooling agents (avoid strong acid or alkaline coolants) to reduce
temperature rise. Avoid oily cooling liquids to prevent chemical reactions. Maintain a moderate cooling rate, controlling the
coolant flow to a high level without causing sudden cooling of the material. Clean the coolant off the workpiece promptly after
machining.
5.Processing Details
Pre-Treatment Steps: After drying the material, conduct annealing to release internal stresses; ensure molds and equipment are free from impurities.
Machining Steps: Three stages of rough, semi-finish, and finish:
Roughing: Allow a residual allowance of 0.3-0.5 mm → Semi-Finishing: Eliminate deformation → Finishing: Achieve tolerances.
Symmetrical Machining Method: Alternate machining of symmetrical faces (e.g., left → right → left cycle).
Layered Cutting: Utilize multiple steps with gradually decreasing cutting depths.
Machining Environment Temperature: For workpieces requiring high dimensional accuracy, machining should be conducted in a temperature-controlled workshop.
6.Material Deformation and Stress Relief Strategies
Deformation arises from internal and mechanical stresses, focusing on prevention and correction.
Causes of Deformation: Thermal expansion, uneven cooling, and accumulation of cutting heat can trigger warping; uneven clamping forces exacerbate deformation.
Preventive Measures: (1) Anneal Before Machining: This releases initial stresses. (2) Optimize Cooling System: Ensure even heat dissipation. (3) Step-by-Step Machining Strategy: Perform roughing followed by finishing, avoiding excessive material removal in one go, and utilize aging to relieve stress in between.
Stress Relief Methods: If deformation has already occurred, conduct secondary annealing or aging treatment, supplemented by mechanical correction (such as pressure forming), taking care to avoid excessive processing.
