Page 674 - Icon Ridge Industrial Tools Catalog
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Lathe tools \ Technical introduction - knurling
Knurling - process
The knurling process is used for the defined 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 fibre structure is not interrupted low surface compaction
clean blank surface high precision and surface quality of the knurl
machining of difficult-to-cut materials (VA steels)
disadvantages of knurl pressing: machining of plastics (flat knurl preferred)
Enlargement of the diameter stress reduction on the machine guides (low radial pressures)
The final 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 flaking 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 left-, 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 left-hand tool and
vice versa, without dismantling the carrier. The carrier can be moved 25 mm
in relation to the clamping shaft and fixated 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 profiles 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 effect produced
Precise tool setting and fine-tuning as well as precise preparation of the
workpiece are also required
Source: Hahn+Kolb Werkzeuge GmbH
674 Technical data subject to change. www.iconridge.com
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