Toothed tool for the cutting deburring of gears

An improvement in a deburring or chamfering tool mountable on at least one face of a guide gear of the type disclosed in U.S. Pat. No. 4,068,558 . The teeth of the tool have on one axially facing side thereof grooves extending from one edge of the tooth to the other thereof. The tool is generally disk-shaped and the grooves are either ring-shaped or shaped in the form of a spiral. Multiple grooves can be provided on the axial face of the disk and the edges which are formed at a location where the grooves intersect a tooth form cutting edges.

FIELD OF THE INVENTION 
The invention relates to a toothed tool and, more particularly, relates to 
a disk-shaped tool having teeth thereon with grooves provided on at least 
one axial side thereof, which grooves are provided on at least an axially 
facing side of the teeth and the locations where the grooves intersect the 
edges of the teeth form cutting edges. 
BACKGROUND OF THE INVENTION 
Tools have already become known, which matingly roll along the workpiece at 
parallel arranged axes wherein the teeth of the tool are designed such 
that they conically engage from the face the workpiece teeth. This conical 
action is achieved by the tool teeth being constructed indeed conically or 
by a tool having sloped teeth wherein the tool tooth edges can be sloped 
on the tooth sides to form an obtuse angle without special design with the 
respective face. In these known tools, the cutting edges which lie in 
longitudinal direction of the teeth are worked in crestlike from the face, 
namely such that the grooves extend longitudinally of the tool tooth 
flanks. According to a different known construction, the teeth are 
constructed of different height, so that the addendum edges of the teeth 
form the said cutting edges. These tools operate very satisfactorily, 
however, forming of the cutting edges is difficult and correspondingly 
expensive. (German OS No. 23 19 060). 
Therefore, the basic purpose of the invention is to provide a toothed tool 
of the above described type wherein the cutting edges can be worked in 
more economically. 
SUMMARY OF THE INVENTION 
The basic purpose of the invention is met by providing a toothed tool in 
the form of a disk having teeth thereon, each of said teeth having grooves 
in at least one surface thereof, which grooves form cutting edges. The 
cutting edges are thereby not formed by the longitudinal edges of the 
grooves, as in the known tools, but by the groove walls wherein through 
nonparallel groove walls, for example walls which converge toward the 
bottom of the groove, still special cutting angles can be achieved. The 
grooves can be mounted on one face of the tool or on both faces. In the 
latter case the tool, when it has become dull, can be reversed. 
The tool according to the invention has furthermore the advantage that 
nontoothed blanks which, however, have grooves, can be prefabricated and 
can be stored and that the teeth need to be worked into said blanks only 
after the individual work task exists. Thus it is possible to produce the 
tools in greater amounts and with less volume of inventory. From the 
standpoint of a rational manufacture of the tool, it is possible to 
manufacture the tool so that the cutting edges are formed by at least one 
groove which is either ring-shaped or spiral-shaped. 
A favorable development of the invention is provided by making the tool so 
that the cutting edges are formed by a multithread spiral arrangement 
because then the cutting edges are staggered from tooth to tooth in 
direction of the tooth heights and a gapless working of the workpiece 
(deburring) is assured. Also this development is particularly advantageous 
for the manufacture of the tool. Of course, a single-thread spiral is also 
possible. 
Further advantages and characteristics can be taken from the following 
description.

DETAILED DESCRIPTION 
FIG. 1 illustrates a front view and FIG. 2 a cross-sectional view of a tool 
embodying the invention. During the manufacture preferably first a 
circular disk 1 is manufactured, the outside diameter of which is greater 
than is needed for the later formation of teeth on a workpiece W (FIG. 5). 
A center bore 2 is provided in the disk for receiving and centering a tool 
carrier therein and, in addition, plural fastening holes 3 are provided in 
the disk to facilitate a fastening of the disk to a guide gear or disk and 
a clamping of the guide gear between a pair of the disks. A single tool 
(disk) and guide gear assembly and if necessary a pair of inventive tools 
(disks) arranged on opposite sides of the guide gear (see guide gear G in 
Fig. 5) are adapted to mate with the workpiece. Furthermore, two slotted 
holes 4 are provided in the disk between the central bore 2 and the outer 
periphery to facilitate an adjustment of the disk relative to the guide 
gear and if necessary to the second tool arranged on the opposite side of 
the guide gear. Such a device is the subject matter of U.S. Pat. No. 
4,068,558. Three spiral-shaped grooves 5, 6 and 7 are machined into the 
disk on the axially facing or front side thereof remote from the guide 
gear. The walls 8 of the grooves extend toward the base of the groove and 
form cutting edges at the location where the grooves intersect the flanks 
of the peripheral teeth described in more detail below. These cutting 
edges facilitate a deburring or chamfering of the axially facing edges on 
the workpieces. 
The outer periphery of the disk is provided with teeth 9 as aforesaid which 
are machined to fittingly mesh with the tooth structure on the workpiece. 
The teeth can be constructed conically, so that they penetrate from the 
front face into the tooth gaps of the tool and they also can 
advantageously be designed in such a manner, as is illustrated 
schematically in FIG. 3. FIG. 3 illustrates a tool tooth, namely viewed 
onto the tooth addendum. The tooth forms a helix angle of such a size that 
one tooth flank 10 corresponds with the edge to be produced on the tooth 
11 of the workpiece. The other edge is formed by a sloped or bevelled 
portion 12. 
The backside of the disk is formed without grooves in the illustrated 
example. Here too grooves can be provided in order to be able to make the 
tool useful on both sides. 
The invention is not to be limited specifically to the illustrated 
spiral-shaped grooves; they may also extend for example straight over the 
front face. Care must then be taken that these grooves terminate at the 
necessary angle to the flanks of the workpiece teeth. 
The groove walls 8 are drawn parallel in FIG. 2. However, it is possible 
for the grooves to have, of course, also any other advantageous cross 
sections, for example the groove walls can converge toward the base. 
Although a particular preferred embodiment of the invention has been 
disclosed in detail for illustrative purposes, it will be recognized that 
variations or modifications of the disclosed apparatus, including the 
rearrangement of parts, lie within the scope of the present invention.