Metal working – Method of mechanical manufacture – Gear making
Reexamination Certificate
2000-04-07
2003-06-03
Echols, P. W. (Department: 3726)
Metal working
Method of mechanical manufacture
Gear making
C029S893300, C029S893350, C072S102000, C407S028000, C409S008000
Reexamination Certificate
active
06571475
ABSTRACT:
The present invention relates to a method of chamfering and deburring gear teeth.
In particular, the present invention relates to a method of chamfering and deburring helical gears, to which the following description refers purely by way of example.
BACKGROUND OF THE INVENTION
Gears normally comprise teeth defined by respective sides and end faces, which, with the sides, form sharp edges along which burrs are left after chip-forming machining, and which must therefore be chamfered for the gear to work and mesh properly.
One known deburring and chamfering method employs a tool featuring a ring gear comprising a number of teeth, which are brought into contact with and pressed against the sharp edges to deform them permanently and form bevels between the sides and end faces of the gear teeth.
A major drawback of the above known method, however, lies in the formation of curls projecting from the gear teeth and partly inside the gaps between the teeth, and which are formed by the permanently deformed material of the tooth, and seriously impair operation of the gear, particularly in the case of high-precision gears. The problem is further compounded in the case of gears which are ground after heat treatment, in which case, the hardened curls may indent the grinding tool.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a gear chamfering and deburring method designed to eliminate the above drawbacks.
According to the present invention, there is provided a method, as claimed in claim 1, designed to eliminate the aforementioned drawbacks.
The present invention also relates to a chamfering and deburring tool.
The present invention also relates to a chamfering and deburring device.
REFERENCES:
patent: 3735619 (1973-05-01), Tersch
patent: 4290718 (1981-09-01), Occhialini
patent: 8307877 (1984-04-01), None
patent: 4130927 (1992-06-01), None
patent: 29715092 (1997-10-01), None
patent: 2091329 (1972-01-01), None
patent: 2225244 (1974-11-01), None
Nyamagoudar, B.;Chamfering and Deburrig External Parallel Axis Gears; Gear Technology, vol. 13, No. 6, Nov. 1, 1996; (pp. 25-31, XP000691319).
European Search Report for Application No. EP 00 10 7582 dated Jul. 24, 2000; (4 pp.).
Echols P. W.
Samputensili S.p.A.
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