Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1999-01-15
2000-08-01
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
29 601, B21H 700
Patent
active
060949562
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lower support tool for deep rolling fillets of a crankshaft. More specifically, the invention relates to a new and improved apparatus for limiting relative lateral movement between the crankshaft and the fillet rolling is tools of a jaw assembly during rolling operation.
BACKGROUND ART
Deep rolling of crankshaft journal fillets for crankshaft strengthening purposes is well known in the art. The journals of a crankshaft for internal combustion engines are disposed between laterally spaced counterweights formed on the crankshaft. The journal fillets are located at the intersection of the journal and the adjacent counterweight and define concentrated annular areas of high stress which must be mechanically relieved to improve crankshaft strengths in these otherwise weakened areas. Various arrangements of floating jaw units are employed at each journal to mechanically roll the fillets and relieve such stresses and strengthen them.
Generally, each jaw unit has opposing upper and lower jaw arms, which are pivotally connected to one another. The jaw arms have facing jaws that are adapted to close about a journal during the deep rolling operation. A hydraulic cylinder is disposed between the opposing end of the jaw arms and is adapted to open and close the facing jaws about the journal and apply a working force to the fillets. More particularly, the jaw of the upper arm has tooling which includes rollers which engage and mechanically work the journal fillets while the opposing jaw of the lower arm has tooling with support rollers that support the journal during fillet rolling. Accordingly, a portion of each jaw unit and the tooling must be in close proximity to the journal and hence the interfacing side wall of the counterweights or other part of the crankshaft while the journal fillets are being rolled.
Prior to the present invention, a linkage has been operatively connected to the lower arm or jaw to limit any tendency of the jaw assembly to move laterally relative to the journal that, for example, may result from a taper of the journal. However, even with such a linkage, lateral movement may occur to such an extent that the flanks or sides of the counterweights or other adjacent portions of the crankshaft are contacted and abraded by the tools or a portion of the jaw assembly. This may cause crankshaft damage and result in part rejection of the crankshaft and re-machining or scrapping of the part. The fillet rolling tools can also be damaged from such contact during deep rolling resulting in production down time for machine repair and tool replacement.
SUMMARY OF THE DISCLOSURE AND ADVANTAGES
The present invention seeks to overcome such problems by improving control over any tendency of the crankshaft to move laterally during fillet rolling by providing a new and improved lower crankshaft support tool which is carried by the lower jaw arm. The lower support tool includes laterally spaced large diameter annular flanges which operatively fit into the annular undercuts or fillets at both sides of the journals of a crankshaft to contact portions of these undercuts to limit lateral shifting of the crankshaft relative to the tooling to improve rolling operation. The upper tool and other components of the jaw assembly may be substantially the same as the prior art.
According to one preferred embodiment of the present invention, there is provided a lower support tool adapted to prevent lateral movement between the crankshaft and the jaw assembly of the fillet rolling machine, which can be used with or replace the lateral movement control linkage of the prior art. The lower support tool includes a roller support housing that is adapted to be attached to the lower arm of a journal fillet rolling jaw assembly. The roller support housing has two spaced apart transverse circular apertures therethrough. A roller unit having a pair of spaced apart flanges extending outwardly from its outer cylindrical surface is associated with each aperture. A crankshaft journal is dis
REFERENCES:
patent: 5445003 (1995-08-01), Gottschalk et al.
Cadena Luis
Vodopyanov Eugene
Hegenschiedt-MFD Corporation
Larson Lowell A.
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