Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate
1999-12-23
2001-08-14
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
C072S107000, C029S006010
Reexamination Certificate
active
06272896
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a secondary roller design for a fillet rolling device and, more particularly, to a secondary roller design for a fillet rolling device which improves the wear characteristics of the primary roller.
BACKGROUND OF THE INVENTION
Cold working is an operation performed on metal components to increase the strength characteristics of that metal component. This operation involves plastically deforming critical portions of the metal component, thereby changing the grain structure therein. This type of operation is commonly used on corner areas of metal components. Such corner areas typically act as stress risers, thereby cracking under extreme loads. The cold working process acts to plastically deform these cornered areas, otherwise known as fillets, to increase the strength characteristics of the particular location.
In crankshaft design, a crankshaft typically has a plurality of fillets located along various points of the crankshaft periphery. Under engine loads, these fillets act as stress risers and if not properly treated, can result in cracking of the crankshaft. As such, typical manufacturers utilize a cold working process on the fillet radii to enhance their strength characteristics. This cold working process typically utilizes a pair of primary rollers which physically contact and deform the fillet radii. To obtain the required force for plastic deformation of the fillet radii, a secondary roller is provided which maintains physical contact and pressure against the primary rollers. This pressure drives the primary rollers into the fillet radii, and thereby plastically deforms the fillet radii.
While this method provides adequate work hardening of the fillet radii, drawbacks exists in regards to the wear characteristics of the primary and secondary rollers. More specifically, the extreme amount of force required by the primary rollers to cause plastic deformation can result in extreme wear between and primary and secondary rollers. This wear requires manufacturers to frequently replace the primary or secondary rollers. As a result, manufacturers are forced to shut down manufacturing lines and replace costly parts. The present invention was developed in light of this drawback.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a metal working device for cold working fillets which has a primary and secondary roller design which reduces wear on the primary and secondary rollers.
The present invention provides a metal working device for cold working fillets which includes an upper block journally supporting a primary roller and a secondary roller. The primary roller has a rounded outer contact surface and the secondary roller has a concave mating surface. A portion of the concave mating surface is rollingly engaged with a portion of the outer contact surface along a predetermined contact area. The predetermined contact area is greater than 90 degrees. A support area is also provided which rollingly supports the object to allow the metal working device to cold work the fillets. Lastly, a pressure supplying device supplies pressure to the upper block to provide the required pressure to cold work the fillets.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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Calcaterra Mark P.
DaimlerChrysler Corporation
Tolan Ed
LandOfFree
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