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According to DIN  6583, the stability refers to the ability of an active pair ( workpiece and tool ) to withstand certain machining processes .

The tool life is influenced by the cutting edge retention of the tool, the machinability of the material and the tool life conditions , i. H. the conditions that affect the machining process.

Stand conditions

The most important stand conditions are:

Further stand conditions are

Stand sizes

Stand sizes are according to DIN 6583

  • the service life  (most important)
  • the tool life 
  • the standing quantity  or the standing volume , 

which are achieved under certain standing conditions until a certain standing criterion occurs. The various stand sizes are therefore always assigned associated criteria and conditions.

Wear parameters are often used as standing criteria . Wear on machining tools is usually the width of wear measured, which is a measure for the free surfaces is wear, and with the scour depth, which is a measure for the crater wear on the rake face is. For example, this means that the service life until a wear mark width of 0.2 mm is reached at a cutting speed of 200 m / min is equal to 60 minutes.

The following values ​​are usually used as permissible wear mark widths:

Wear mark width High speed steel / carbide Cutting ceramics
Roughing 0.8 to 1.0 mm 0.3 mm
Finishing 0.2 to 0.4 mm 0.3 mm

Other standing criteria besides wear are

Relationship between the stand sizes

In some processes it is common to specify the tool life, which depends on the tool life .

When drilling and milling , the tool life is measured in the feed direction:


  • - Tool life in feed direction (Engl. Feed )
  • - feed
  • - speed ,

when planing and broaching in the cutting direction:


  • - Tool life in the cutting direction (English cut )
  • - cutting speed.

Sometimes the tool life is also given, which also depends on the tool life:


In addition to the service life, the stability can generally also be specified by the conditions or criteria:

Here the cutting speed of a certain tool, at which a wear mark width of 0.2 mm is reached within 15 minutes, is equal to 200 m / min.

The value

however, indicates the cutting force for a cutting depth of 2 mm and a tool life of N = 500.

See also

Individual evidence

  1. ^ Fritz Klocke, Wilfried König: Manufacturing process 1. 8th edition. 2008, p. 259.
  2. a b c d Fritz Klocke, Wilfried König: Manufacturing process. 8th edition. Springer, 2008, p. 259 f.
  3. ^ Alfred Herbert Fritz, Günter Schulze: Manufacturing technology. 11th edition. Springer, 2015, p. 289 f.
  4. Berend Denkena, Hans Kurt Tönshoff: Spanen - basic. 3. Edition. Springer, 2011, p. 149.
  5. Herbert Schönherr: Machining production. Oldenbourg, 2002, p. 48.