Acetal Machining

Acetal (Delrin®) is a high-performance engineering thermoplastic widely used in the manufacture of high-precision mechanical parts such as gears and bearings. Not only does it have excellent mechanical properties, but it also has excellent dimensional stability.

The Machining of Delrin® often involves complex CNC machining techniques, which makes it irreplaceable in a variety of industries such as consumer electronics, automotive, and industrial equipment.

Acetal Advantages

  • Mechanical Excellence
    Acetal has excellent mechanical properties, including high impact resistance and low friction characteristics.
  • Dimensional Stability
    Acetal demonstrates superior dimensional stability during CNC machining and is suitable for high precision products.
  • Temperature Resistance
    Acetal is able to maintain performance over a temperature range of -40°C to 120°C for a wide range of environmental conditions.
  • High Processing Efficiency
    Acetal is easy to cut and machine, reducing machine wear and shortening production cycles.

Acetal Machining Technology

  • CNC Machining
    Includes CNC turning, CNC milling and drilling.
  • Injection Molding
    Suitable for mass production, such as quick couplings and fasteners.
  • Extrusion
    For the production of Acetal rods, tubes and profiles.
  • Laser Cutting
    Can be used to accurately cut thin sheet materials.
  • Other technology
    Including bonding, mechanical fastening and thermal welding.

Surface Finishing

  • As-Machining
    Acetal’s CNC machined parts are machined to an excellent surface finish, and with the right cutting tools and parameters, a Ra3.2 finish can be achieved directly.
  • Spray Painting
    Acetal spray painting requires a number of surface treatments to improve the adhesion of the coating for different colors.
  • Mechanical Grinding
    Sanding removes the gloss from the surface, making the surface more suitable for painting or other coating treatments.

Design Recommendations

  • Designed to the Standard Dimensions of the Material
    Acetal is normally supplied in standard thicknesses in sheet or solid bar. Standard sizes should be used in design wherever possible to minimize material waste and processing costs.
  • Avoid Pursuing Minimum Wall Thicknesses
    Minimum wall thickness designs may be difficult to fix and reproduce and may result in material bending, distortion or vibration. Best practices in machined designs should be used to improve reliability and economy of production.
  • Simplified Design
    Complex designs often mean higher machining costs. Simplifying the design of a part and minimizing unnecessarily complex features can significantly reduce the cost of machining time.

Technical Parameters of Acetal

Property Name Numerical Range
Tensile Strength, Yield Strength (MPa) 73-76
Elongation at break (%) 25-45
Hardness (Rockwell M) 94
Heat Deflection Temperature at 0.46 MPa (°C) 160-169
Melting point (°C) 175-178
Property Name Numerical Range
Tensile Strength, Yield Strength (MPa) 53-56
Elongation at break (%) 10-19
Hardness (Rockwell M) 77
Heat Deflection Temperature at 0.46 MPa (°C) 160-169
Melting point (°C) 175-178

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