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PROCESSING

Our machining department is equipped with modern CNC machines that enable precise and customised adaptations. Whether cutting, drilling, milling or other specific machining - we offer you customised solutions that are precisely tailored to your requirements.

Our experienced employees ensure that every machining step is carried out with the highest precision and quality.

Machining of GRP profiles

The processing of GRP profiles is simple and similar to woodworking. The most common machining techniques are drilling, milling, sawing, turning, punching and thread cutting.

For drill holes up to 12 mm in diameter, a simple cemented carbide burin accordance with DIN 8037 or DIN 8038 can be used. For holes larger than 12 mm in diameter,a diamond-studded burcan be used. A wooden underlay should be used to minimise fraying at the drill exit.

Drilling speed 60–80 m/min. Diamond-studded drill 300 to 1200 m/min

 

For milling GRP, a cemented carbide or diamond milling cutteris highly suitable. A higher feed rate can be achieved with cemented carbide milling cutters. The usage of coolantsis recommended as GRP profiles are bad conductors of heat.

Cutting speed 100 to 400 m/min

 

For small quantities of items, a metal sawis adequate. However, if the volume is higher, it is recommended to use adiamond-studded saw blade. The diameter of the saw blades should be between 200 and 500 mm depending on the wall thickness. For dry processing, suction extractionis recommended.

Cutting speed 1800 to 3600 m/min.

 

 

For turning, standard equipment is adequate for small quantities of items, the same as in metal processing. For larger quantities, on the other hand, cemented carbide equipment can be used, such as, for example, that used for brass or aluminium processing. Water cooling is always recommended.

Cutting speed: the same as with brass or aluminium.

 

For die-cutting, hardened steel tools should be used. The material thickness of the workpiece being machined should not be more than 10 mm, however.

Max. material thickness during die cutting = 10 mm

 

Threads should only be cut if the connection is not subjected to too high a tensile load. The tear resistance is about one-third that of metallic threads, but sufficient strength for many applications is quite feasible, with an exact fit and the use of adhesive.

Pipe and trapezoidal threads allow better force transmission than metric threads

 

GRP can be easily and firmly bondedwith polyurethane and epoxy-resin-based adhesives. However, the instructions given should be observed.

  1. Roughen the surface
  2. Remove dust
  3. Degrease with solvent

  4. When applying adhesive, observe the manufacturer's guidelines.

     

For rivets, the hole should be slightly larger than the rivet diameter. The use of adhesives to increase bond strength is recommended.

 

For lightly loaded connections, self-threading screws are adequate. For compounds that are highly stressed, machine screws should be used. The use of adhesives to increase bond strength is also recommended when screwing.

 

Surfaces whichneed to be varnished should first be thoroughly cleaned and degreased with a solvent. As a varnish, we recommend a system based on polyurethane.

The best varnishing results are achieved with 2-component PUR varnishes.

 

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