Very narrow tolerances can be adhered to if the right knurling technique and tool is applied. In this report a conical face is knurled with a tolerance limit of +/- 0,05 mm.
Very narrow tolerances can be adhered to if the right knurling technique and tool is applied. But not only that! We have chosen this example, as not only could the narrow tolerances be kept, but also a high profile quality was achieved over large quantities, stainless steel was processed and a conical face was knurled. This example therefore serves to rebute the assertion that “ narrow tolerances are impossible to adhere to with knurling operations”.
On the first glance the application requirements in the example given seemed to be difficult to meet: A bushing made of stainless steel with a 3° conical face should be knurled. The knurled shoulder had to be manufactured within the tolerance limit of +/- 0,05 mm. This very high accuracy grade exacted a high process stability during the complete production process.
Material: 1.4301 (stainless steel with 500-700 N/mm² tensile strength)
Machine: Star SR20 RII
Part: Bushing
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Hommel + Keller’s application technicians found a successful solution for this exacting application:
A zeus® knurling tool 131-12R, especially developed for the use on swiss type auto lathes and small work spaces, was used for the application. In order to knurl the flat cone, the knurling tool was set at a 3° angle. Due to the integrated set screws, a correct and precise setting was considerably easier.
As Hommel + Keller focuses within the premium product segment on high-quality material and processing, even such small tolerances can be adhered to. The bore and shoulder pin of the knurling wheel are ground providing extra high smoothness of running and a precise and vibration-free processing.
Tool applied: RW131-12R 150404-A
Knurling wheel applied: No.10 AA 15x4x4, P.0,5/ 90°
Speed rates: Vc = 35 m/min
Feed rate: F= 0,06 mm/rev
Tool life: 1000 pieces/knurling wheel
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zeus® Form knurling tool 131-12R 150404-A
The required high dimensional accuracy could be adhered to during the whole operation by using a Form Knurling Tool
zeus® 131. The distinctive profile on the cone was of a high quality on the complete lot processed.
Further questions?
Please contact Benjamin Fritsch on our Hotline: +49 (0)7424 9705-343
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