toplogo
Verlauf_Oben
 
PTB > Structure > Division 5 > Department 5.5> Working Group 5.53
Deutsche Version
Working Group 5.53
Advanced Fabrication Technology
- Ultraprecision Engineering
- Thermal wearing out
- Polishing

Thermal wearing out

The spark erosive preperation of conductive materials is to be applied in the building of measurement instruments due to the constant advancement of the generators and the well engineered technology ever more.

The produced surfaces meanwhile reach grinding quality and with micro-erosion structures are economically to be produced that are hardly attainable by conventionell machine cutting processes.

CNC wire-cut EDM

The CNC wire-cut EDM with its five simultaneously moveable axes allows with wire thicknesses of 0,25 mm or 0,1 mm the production of complex three-dimensional geometries at constant wear of the tool - therefore the wire - a high degree of dimensional accuracy.

According to the difficult workpiece geometry, the program is drawn up both on the machine control and externally at a CAM workstation.

Figure: CNC wire-cut EDM machine
of type ROBOFIL 4020
Charmilles Technologie S.A.
Geneva/Switzerland

This machine serves to machine components whose fabrication by conventional methods would require considerable effort or would otherwise be impossible.

Figure: Adapter tube of a liquid
measuring facility from
stainless steel (1.4301)


nach oben

CNC die-sinking EDM

The CNC die-sinking EDM machine is aquipped with a fine adjusted pulser.

Therewith next to normal eroding processes it is possible to produce holes with a diameter of less than 50 micrometers and a aspect ratio of at least 10 by micro-EDM as well as finest structures on the surface of workpieces made from electrically leading materials by processing with contouring system and various cycles.

Figure: CNC die-sinking machine
AGIETRON-EXAKT from AGIE,
Losone/ Switzerland


The required micro-electrodes are produced by means of a wire-cut EDM device based on a worktable.

Figure: Wire-cut EDM device for
           trueing of micro-electrodes
        



nach oben© Physikalisch-Technische Bundesanstalt
Page created: 2001-05-31, last update: 2006-12-04, Holger Drösemeyer