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Turning tools \ Technical introduction - knurling

Knurling - process

The knurling process is used for the defi ned production of surfaces. In principle, a knurl serves as a power transmission element on components that are operated
manually. Through the knurling process, the surface on the component is raised and higher forces can be transmitted. the process is used in all sectors from the
watchmaking industry to mechanical engineering. Knurling can be applied to a wide range of materials.
A distinction is made between two basic knurling processes:

Knurl pressing (forming) is a chipless process in which the mate- Knurl cutting is a cutting process
rial begins to flow  Axial knurls (axial machining direction)

 Recessed knurls (radial/tangential)
 Axial knurls (axial machining direction)

advantages of knurl pressing: Advantages of knurl cutting:

 cost-effective production of a knurl possible  small structure of workpiece diameter as material is cut
 high stability as the fi bre structure is not interrupted  low surface compaction
 clean blank surface  high precision and surface quality of the knurl
 machining of diffi cult-to-cut materials (VA steels)

disadvantages of knurl pressing:  machining of plastics (fl at knurl preferred)
 Enlargement of the diameter  stress reduction on the machine guides (low radial pressures)
 The fi nal diameter must be calculated  use in CNC lathes (series production, process safety)
 High force exertion resulting in high stress on machine and workpiece  VDI direct intake (VDI 16 to VDI 50)
 Risk of fl aking of the material  knurling of thin-walled tubing without deformation of the workpiece
 Limitation of the components to be manufactured (very thin-walled compo-  diameter tolerances of up to ± 0.05 mm achievable
nents cannot be machined)  use as le -, right-hand and conventional tool: No tool available on the market

offers these application options. Thanks to the patented adjustment mech-
anism, it is possible to transform a right-hand tool into a le -hand tool and

vice versa, without dismantling the carrier. The carrier can be moved 25 mm
in relation to the clamping sha and fi xated in any position. These tools can

therefore be used on CNC and conventional machines at will.
Disadvantages of knurl cutting:
 limited application range: only knurl profi les RAA and RGE are producible;
only cylindrical workpieces can be machined in the axial machining direction
 a recess is required to place the tool in the centre area of the workpiece.
 Time-consuming machining resulting in high cost
 Lower stability. Fibre structure is interrupted and notching eff ect produced
 Precise tool setting and fi ne-tuning as well as precise preparation of the
workpiece are also required

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com
Availability subject to country specific rules and regulations. 323

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