METHOD FOR CRYOGENIC MANDREL EXPANSION

• US 3,805,567 A
• Filed: 09/07/1971
• Issued: 04/23/1974
• Est. Priority Date: 09/07/1971
• Status: Expired due to Term

• Current Assignee: Joseph A. Agius-Sinerco
• Original Assignee: Joseph A. Agius-Sinerco
• Inventors: Agius-Sinerco, Joseph A.
• Primary Examiner(s): Lanham, Charles W.
• Assistant Examiner(s): Combs, E. M.
• Application Number:
  US05/178,332
• Time in Patent Office: 959 Days
• Field of Search: 29/447 72/41,42,342,364,370,700 75/170 148/11.5F 285/381,DIG.5,DIG.10
• US Class Current: 72/42
• CPC Class Codes: B21D 41/02 Enlarging
• CPC Class Codes: C10M 2205/022 Ethene
• CPC Class Codes: C10M 2205/024 Propene
• CPC Class Codes: C10M 2205/14 Synthetic waxes, e.g. polythene waxes
• CPC Class Codes: C10M 2205/16 Paraffin waxes; Petrolatum, e.g. slack wax
• CPC Class Codes: C10M 2205/17 Fisher Tropsch reaction products
• CPC Class Codes: C10M 2209/104 of alkylene oxides containing two carbon atoms only
• CPC Class Codes: C10M 2211/06 Perfluorinated compounds
• CPC Class Codes: C10M 2213/02 obtained from monomers containing carbon, hydrogen and halogen only
• CPC Class Codes: C10M 2213/062 Polytetrafluoroethylene [PTFE]
• CPC Class Codes: C10M 7/00 Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances compositions in general essentially based on macromolecular compounds C08L
• CPC Class Codes: C10N 2040/02 Bearings
• CPC Class Codes: C10N 2040/24 without essential removal of material , e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
• CPC Class Codes: C10N 2040/241 Manufacturing joint-less pipes
• CPC Class Codes: C10N 2040/242 Hot working
• CPC Class Codes: C10N 2040/243 Cold working
• CPC Class Codes: C10N 2040/244 of specific metals
• CPC Class Codes: C10N 2040/245 Soft metals, e.g. aluminum
• CPC Class Codes: C10N 2040/246 Iron or steel
• CPC Class Codes: C10N 2040/247 Stainless steel
• CPC Class Codes: C10N 2050/02 : dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
• CPC Class Codes: C10N 2050/04 : Aerosols
• CPC Class Codes: C10N 2050/08 : Solids
• CPC Class Codes: C10N 2050/10 : Semi-solids; greasy
• CPC Class Codes: Y10S 285/904 : Cryogenic
• CPC Class Codes: Y10S 72/70 : Deforming specified alloys or uncommon metal or bimetallic work
• CPC Class Codes: Y10T 29/49865 : by temperature differential [e.g., shrink fit]

Abstract

Described herein are improved methods and means for lubrication during diametral mandrel expansion of hollow couplings at cryogenic temperatures, the couplings being formed of a metal susceptible to the impartation of dimensional heat recoverability by deformation at a temperature below that at which the material undergoes a martensitic transformation. Films or fibrilous cloths of organic material are disposed between the interior wall of the part and the mandrel, the material being such as to undergo plastic deformation at the temperatures and pressures obtained during forcible expansion of the fitting internal diameter of from about 3 to about 9 percent, in order to provide roller bearing lubrication. Preferred lubricant materials are polyethylene and related linear polymers and waxes and fluorocarbon oligomers. The couplings may be formed of titaniumnickel or beta-copper alloys, stainless steels and the like.

Claims

2. A method according to claim 1 wherein the internal surface of the hollow coupling is provided with a plurality of radial teeth.

3. A method according to claim 2 wherein said organic material is in the form of a fibrilous cloth.

4. A method according to claim 2 wherein said cryogenic liquid is liquid nitrogen and wherein said transition point is less than about -75*C but above about -196*C.

5. A method according to claim 3 wherein said cryogenic liquid is liquid nitrogen and wherein said transition point is less than about -75*C but above about -196*C.

6. A method according to claim 1 wherein said organic material is a polyethylene.

7. A method according to claim 2 wherein said organic material is a polyethylene.

8. A method according to claim 3 wherein said organic material is a polyethylene.

9. A method according to claim 5 wherein said organic material is a polyethylene.

10. A method according to claim 3 wherein said cloth is wrapped about the tapered portion of said mandrel before insertion thereof into said coupling.

11. A method according to claim 3 wherein the interior of said coupling is lined with said cloth before insertion of the tapered portion of said mandrel therein.

12. A method according to claim 3 wherein said cloth is a high density polyethylene spun bonded cloth.