Metal deforming – Process – Tube making or reshaping
Patent
1998-02-17
1999-08-31
Larson, Lowell A.
Metal deforming
Process
Tube making or reshaping
723912, B21D 3100
Patent
active
059438983
ABSTRACT:
A method and apparatus for coldworking holes using a pre-lubricated tubular seamless sleeve made of shape memory alloys. The apparatus uses a pre-lubricated tubular seamless sleeve made of shape memory alloys, a mandrel having a larger diameter end, a nose cap with rough conical surface, and a spacer with rough complementary conical surface. The sleeve is placed and sufficiently firmly held between the conical surfaces of the nose cap and spacer which are carried in a mandrel pulling means. The larger diameter end of the mandrel passes forwardly through and out of the sleeve whose diameter is therefore elastically expanded by the passing mandrel and thereafter restores to its original diameter because of the superelastic property of the shape memory alloys. The smaller diameter portion of the mandrel is surrounded and within the sleeve. The sleeve together with the mandrel are then inserted into a hole in an associated workpiece. The nose cap being carried on the mandrel pulling means is placed against the workpiece. The mandrel retracts backwardly through and out of the sleeve; thereby expands the sleeve wall against the hole wall and exerts radially outward forces on the sleeve, which in turn transmits the coldworking forces to the hole wall. After the mandrel is pulled out of the hole, the sleeve diameter restores to its original diameter because of the superelastic property of shape memory alloys, and therefore it can be easily removed out of the hole.
REFERENCES:
patent: 3566662 (1971-03-01), Champoux
patent: 3895922 (1975-07-01), Phillips
patent: 3943748 (1976-03-01), King, Jr.
patent: 3951561 (1976-04-01), Speakman
patent: 4164807 (1979-08-01), King, Jr.
patent: 4423619 (1984-01-01), Champoux
patent: 4433567 (1984-02-01), Mead
patent: 4665732 (1987-05-01), Hogenhout
patent: 5127254 (1992-07-01), Copple
C. M. Wayman, Shape Memory Alloys, Materials Research Society Bulletin, vol. 18, No. 4, Apr. 1993.
LandOfFree
Method and apparatus to coldwork holes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus to coldwork holes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus to coldwork holes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2423078