Engineering plastic = structural, high-temperature and standard plastic

Why use CNC machining (CNC turning, CNC milling) of engineering plastics ?
Machining is often the most cost-effective way to produce parts in small to medium batches. A wide selection of materials is available and machining offers great design flexibility without the high costs for tools associated with stamping. This is one of the main advantages over plastic injection, where a more or less complicated mold is always required.
The dimensions and construction of components can be changed relatively easily without excessive costs. CNC machining of technical plastic makes it possible, among other things, to create sharp transitions and corners, which is difficult to achieve in the case of injection molding or casting of plastic parts. Components made of laminated insulators can also have internal and external threads, which allows them to be further assembled into sets.
PWR Composite combines the technical possibilities of modern CNC equipment with long-term experience in machining laminated insulators (laminated plastic).
Parts made in PWR Composite are currently used in a variety of implementations, ranging from train components to single-purpose machine components to medical devices and machining center parts.
Thanks to its approach to each order, PWR Composite can produce batches of large or low volumes, but also individual unit orders.

 

Tolerance

Machining tolerance for technical plastic is higher than tolerance for metal parts. This is mainly due to the increased coefficient of thermal expansion for possible deformations caused by internal stresses and other external influences. For turned or milled parts, a tolerance of 0.1 - 0.2% of the nominal size must be taken into account, but for small parts, the minimum tolerance is only 0.05 mm. More precise tolerance can be achieved with High-Tech materials such as CELAZOLE, TORLON, the PEEK range and TECHTRON.

When checking the dimensions, it is necessary to take into account the influence of temperature and the force applied to the measuring device, especially during manual measurement. Differences in measurements in various environments and different operators can be significant.
When designing a product, it is always recommended to consult the required tolerances in advance.

 

Dimensional options of machined parts:

Turning :                                   Ømin - max = 1 - 500mm, active length 660mm
Milling :                                     1000 x 660 x 400 mm
Shape milling of
thin materials or engraving:   1200 x 2500 x 120 mm  (a tolerance of ± 0.1 mm must be taken into account here) 

 

Production takes place on the basis of documentation supplied by the client, preferably in the form of blueprints and 3D models. From the initial phase of demand, PWR Composite communicates potential bottlenecks in terms of manufacturability, usability of materials, requirements of standards, etc.
 
For correct pricing, it is necessary to supply the following information / documents:
Necessary:
  • 2D blueprint or sketch with required dimensions,
  • Required material,
  • Quantity.
Recommended:
  • 3D model in stp or iges format,
  • information on whether the project is a one-off or recurring,
  • packaging requirements,
  • other specific requirements,
  • required order currency.
 
Samples:

Technical plastic parts are used in all industries. In a number of sliding and construction elements, stop and guide rails of conveyors, pulleys, bearing bushes, grinding templates, sliding plates, seals and sealing rings, plastic stops, threaded reducers and couplings, plexiglass metal glazing, polycarbonate parts, plastic inserts, covers, floats , hoppers, chutes, ...
 
 List of machines

Machining demand

Repeated production:

- 3D model is not mandatory. It serves to better visualization of the requested part and to fasted price calculation especially for complicated parts.
- Technical specifications are not mandatory. If they will not be attached to RFQ, the drawing is the base.