Abrading – Abrading process – Gear or worm abrading
Patent
1997-05-09
1998-09-15
Rose, Robert A.
Abrading
Abrading process
Gear or worm abrading
451 48, 451 8, 451409, 451220, B24B 330
Patent
active
058071644
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and a device for regrinding tools with straight and helical grooves with the help of a positioning head, which is provided with a feeler pin, which engages a groove and, in the advancing direction, is disposed in front of the grinding disk.
As is generally known to those skilled in the art, there are basically two possibilities for regrinding tools with straight and helical grooves.
On the one hand, a machine is used with numerical control for the individual axial movements. These machines are relatively expensive to acquire and are very suitable for a larger number of units; however, it is necessary to know the exact geometry of the tool, which is to be reground, or to measure this geometry before the regrinding of the grooved tool so that these values can be taken over in the control system.
A further possibility for regrinding grooved tools consists of using a manually controlled regrinding machine, which has an advantageous purchase price and is also suitable for a smaller number of units. For the regrinding, the tool, which is, for example, helically grooved, is clamped at one end of its shaft by a chuck, a collet, a conical retainer or a different spindle sleeve. The spindle sleeve is shifted manually in the advancing direction. The tool geometry in relation to the slope of the helix need not be known, because the guidance of the tool, which is to be ground, is restricted by a feeler pin. During the grinding process, this feeler pin engages a helical groove of the tool, which is to be reground. The slope of the groove corresponds to the slope of the contour, which is to be reground. Since the grinding tool (grinding/disk), upon entering the zone that is to be ground, has to be guided accurately by the feeler pin at the tool that is to be reground, the feeler pin is disposed some distance in front of the grinding disk in the advancing direction. Due to this lead of the feeler pin in front of the grinding disk, the feeler pin is in the outlet region of the helical groove ahead of the grinding disk. As soon as the feeler pin leaves the region of the completely formed groove profile, the grinding process must be stopped, as otherwise either the reground contour is distorted or the tool which is to be reground, is ground incorrectly and thus becomes useless. A similar effect occurs when the feeler pin leaves a groove, which runs out into the open. The profile, which is to be reground on the tool, cannot be reground over the whole of its length with this method. A method or a device of the type described above is presumed known in the introductory portion of claim 1 and of claim 4.
SUMMARY OF THE INVENTION
It can be inferred as known from the French publication 1,455,182 that, for regrinding a tool, a positioning head with two feeler pins is used. The tool is a rotating knife carrier, provided with individual cutting tools and, for the positive engagement of the feeler pins, grooves are provided on this knife carrier. However, these grooves are of no importance for the functioning of the tool.
For a manually controlled regrinding machine, it is the object of the invention to develop the known method or the known device further, so that regrinding of the profile, which is to be reground, becomes possible with the highest precision over the whole length of the profile.
Pursuant to the invention, this objective is accomplished, for the method, with the distinguishing features of claim 1 and, for the device, with the distinguishing features of claim 4.
It is of decisive importance to work with a retractable feeler pin, which leads the grinding disk, and with a second feeler pin, which is rigidly connected with the positioning head and trails the grinding disk. It becomes possible owing to the fact that, for grinding the start of the groove, the first, retractable feeler pin guides, while subsequently, over a certain length of groove, both feeler pins guide simultaneously. After the second feeler pin has entered the groove of the tool that is to
REFERENCES:
patent: 1694074 (1928-12-01), Martone
patent: 3663190 (1972-05-01), Fisk
patent: 3675372 (1972-07-01), Kushigian
patent: 4157635 (1979-06-01), Ward
patent: 5551906 (1996-09-01), Helgren
Nguyen George
Rose Robert A.
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