Turning – Severing or cut-off – Processes
Patent
1996-12-17
1999-02-09
Pitts, Andrea L.
Turning
Severing or cut-off
Processes
82 83, 72 85, 72128, B21H 106
Patent
active
058680500
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for the continuous chipless separation of identical individual rings from tubular workpieces.
2. Description of the Prior Art
Ring-shaped components are widespread in technology. In roller bearing technology, such components constitute a substantial portion, in terms of quantity, of the parts used. As is generally known, each roller bearing consists of at least two ring-shaped components, namely, the inner ring and the outer ring. These rings are produced in great numbers, for example, from tubular semifinished products of antifriction bearing steel. The division of tubular material into rings of equal size is thus a standard production step during the production of roller bearings. It is also a very important step, given the growing competition in the roller bearing industry. As efforts are made to achieve greater productivity and lower manufacturing costs, this production step assumes great significance. Especially during chip-producing separation, greater material expensive contributes to high costs.
A generic process for the chipless separation of identical individual rings from tubular workpieces is disclosed in German reference DE-OS 1602950. In this process, three cutting rollers with thread-shaped cutting edges are arranged around the workpiece to be processed. All three cutting rollers are driven in the same direction and pressed against the workpiece surface. The tubular workpiece rotates in the direction opposite to that in which the cutting rollers rotate and is thereby moved forward axially. The respective rotational positions of the three cutting rollers are such that the cutting contact with the workpiece occurs on an exactly shared cutting plane. The diameter of the cutting rollers increases, starting from the beginning and going toward the end, forming a narrowing channel. This device is not suitable for producing highly-accurate roller bearing rings, because the face regions of the separated rings are very rounded. Furthermore, the cutting edges of the cutting rollers wear out rapidly, because antifriction bearing steel has especially high deformation resistance; no measures to reduce this deformation resistance are indicated.
Another process for dividing tubular material is known from German reference DE-PS 10 13 487. In this process, a working head revolves around the tube to be divided. The working head has die holders arranged peripherally on a cross-sectional plane as well as cutting rollers mounted detachably in these holders. The cutting, rollers have cutting edges with substantially radial flanks, which can be brought to rest on the face of the tube to be divided during the dividing process. This process permits only discontinuous separation of individual tube segments. The device is not suitable for continuously separating identical rings from tubular material in short cycles.
SUMMARY OF THE INVENTION
The object of the invention is to provide a process for the continuous chipless separation of identical individual rings from tubular workpieces, which preferably permits highly-accurate rings to be manufactured from antifriction bearing steel, so that subsequent metal-cutting processing is completely eliminated or else its cost is low and so that hot-rolled tubes can be used directly without upstream heat treatment. A further object is to provide long service life for the cutting tool even when antifriction bearing steel is being processed.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in a process for continuously, chiplessly separating identical individual rings from a tubular workpiece, which process includes the steps of initially heating the tubular workpiece to a temperature that substantially lowers deformation resistance of the workpiece material so that a higher temperature is produced on an outer surface of the workpiece than on an inner surface of the workpiece, driving three cutting rollers having thread-lik
REFERENCES:
patent: 3470775 (1969-10-01), Marcovitch
patent: 3847002 (1974-11-01), Suzuki
patent: 4163402 (1979-08-01), Bykhovsky
patent: 5553729 (1996-09-01), Kitano
patent: 5598729 (1997-02-01), Hoffman
Mannesmann Aktiengesellschaft
Pitts Andrea L.
Williams Mark
LandOfFree
Process and device for the continuous, chipless separation of in does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for the continuous, chipless separation of in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for the continuous, chipless separation of in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1942854