Milling tool as well as segment therefor

Abstract

The invention relates to a milling tool that is formed for the hobbing of a workpiece having cogs, such as cogwheels, racks and the like, and comprises a cylindrical tool body that defines a rotation axis and comprises a plurality of disc-shaped segments. Each one of the segments includes a hub part having two opposite plane-parallel end surfaces, which extend perpendicular to the rotation axis, and a peripheral cam having a plurality of tangentially spaced-apart milling inserts. Bordering segments are detachably interconnected by means of one each of male and female members co-operating in pairs. The male and female members are situated so that the rotation axis extends through the male and female members. The male and female members include each a contact surface, which converges from a big end toward a small end and which, in a cross-section across the rotation axis, forms an out-of-round curve. The contact surfaces of the male and female members are dimensioned so that they, when the male and female members are being brought together, direct their two bordering segments toward an end position that is centred and mutually angularly determined by the out-of-round cross-section curve around the rotation axis and where the plane-parallel end surfaces abut against each other. In addition, the invention relates to an individual segment as such.

Description

technical field [0001] In a first aspect, the invention relates to a milling cutter formed for hobbing workpieces having cogs, such as cogwheels, racks, etc., comprising a cylindrical body defining axis of rotation and includes a plurality of disc-shaped segments. [0002] In a further aspect, the invention also relates to a separate segment for a knife. Background technique [0003] Milling cutters for hobbing are usually provided as solid cutters in which the milling inserts are placed along a helix that follows a cylindrical cutter body. In the manufacture of such tools, in those cases where the milling insert is integrated in the tool body, there may occasionally be problems of obtaining access to machine the seat for the milling insert or the milling insert itself. This is due to the fact that the distance between axially successive turns of the helix of the milling insert is occasionally narrow. This is the reason why milling cutters for hob milling are also provide...

AI Technical Summary

Problems solved by technology

[0005] The problem with this previously known segmented hob is that the machining accuracy of the surface produced in the workpiece is not high enough for certain applications

Additionally, mounting separate segments on a common shaft or mandrel is occasionally problematic and occasionally requires complex adjustment grinding

In these cases, this is particularly cumbersome when, for example, after some individual segments have been damaged, the knives have to be removed and put together again with new undamaged segments

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