Spline Rolling Process

Spline Rolling & Serration Rolling

Kinefac spline and serration rolling processes are based on more than 60 years of innovation and experience in cylindrical die rolling. Unlike the rack rolling process where two opposing flat racks roll the form, Kinefac processes use two or three cylindrical dies which are driven in precise rotational phase to roll the form.

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Splines and serrations are typically used in torque transmitting applications requiring a precision fit to a mating part as opposed to knurls which generally do not require a precision mating fit. Half shafts, drive shafts, electric vehicle motor shafts, and power take-off shafts are common types of splined and serrated components.

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Splines and serrations on solid shafts can be rolled on Kinefac equipment using the infeed or single-revolution rolling process with two dies. In hollow shaft applications the forced-throughfeed rolling process with three dies can be used. The forced throughfeed rolling process can also be used to produce continuous lengths of splines and serrations on both solid and hollow shafts using two or three dies. Precision tolerance levels of ANSI Class 5 (DIN Class 8) or better can be achieved by Kinefac spline rolling processes.

first it has to be clarified if it is an internal or external spline
In case it is an internal spline the methods of production
when in large quantities would be broaching , in case the spline diamter is large then maybe by a gear shaper
both processes require special toolings
In case of an external spline it can be hobbed on a hobbing machine or a spline milling machine which works like a hobbing machine but is normally horizontal
a special hob would have to be made to cut the spline
external splines can also be ground on a spline grinding machine

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