Workpiece examples for honing

  • grundlagen honen1
  • grundlagen honen2
  • grundlagen honen3
  • grundlagen honen4

Basic principles of honing

 

Definitions according to VDI 3220

Honing is a cutting process where multi-edge tools coated with particles with continuous surface contact between the tool and workpiece are used to optimise the dimension, form and surface of pre-machined workpieces. Between tool and workpiece a change in direction of the longitudinal movement takes place. The finished surfaces are characterised by a cross-hatch pattern on the surface.

Process kinematics today

The work process with honing is a combination of stroke and rotation movement of an expandable honing tool with inserted honing stones or diamond sticks. The result is the surface structure with cross-hatch pattern generated by the honing process. The timing of the honing is defined by quick cutting of the peaks of the pre-machined bore surface. This rapidly achieves a smoothing of the surface.

Cutting speed

The cutting speed of the honing is the result of two components:

  • the axial speed Va = 12 to 25 m/min and
  • the circumferential speed Vu = 20 to 50 m/min.
  • The over-cutting angle ∂ of the machining traces should range from 60° to 90°.
     

Stroke length and position

In order to realise the bore cylindricity, the stroke length and position of the honing tools must be adjusted such that with a standard work stroke approximately a third of the honing stone protrudes at the upper and lower ends of the bore (stroke length = bore length – 1/3 honing stone length). Honing is also possible with blind holes. In this case secondary honing or a stroke delay at the bore end with specially formed blind hole honing tools are particularly important.

The results of the honing process are:

  • quick material removal with adherence to tight dimensional tolerances
  • high geometrical accuracy also with difficult workpieces
  • selectively realisable surface finish with high contact area

illu-grundlagen

 

Bore forms

In addition to simple through bores, special tools can be used to machine blind holes. Large surface tools can be used to hone without a high cost bores with openings, grooves and wedge profiles.

It is possible to correct the following bore errors

illu-kruemmung illu-konizitaet illu-tonnenform illu-unrundheit illu-untermass illu-vorweite illu-welligkeit
curvature conicity barrel form lack of roundness undersize taper waviness

 

 

 

Adress

NAGEL Maschinen- u. Werkzeugfabrik GmbH
Oberboihinger Straße 60
D-72622 Nürtingen

Phone: +49 7022 / 605-0
Fax: +49 7022 / 605-250
E-Mail: info@nagel.com

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