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Spin Riveting Cast Metals

IP.com Disclosure Number: IPCOM000037999D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Baumler, FJ: AUTHOR [+4]

Abstract

Presented is a method for spin riveting die cast zinc parts together by using frictionally developed heat. Since die cast zinc exhibits an extremely large potential for elongation and plastic flow when heated, it can be used for forming small mushroom-shaped rivet heads on pins that are consolidated into one of the parts to be fastened.

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Spin Riveting Cast Metals

Presented is a method for spin riveting die cast zinc parts together by using frictionally developed heat. Since die cast zinc exhibits an extremely large potential for elongation and plastic flow when heated, it can be used for forming small mushroom-shaped rivet heads on pins that are consolidated into one of the parts to be fastened.

Referring to Figure 1 and 2, a part 1 containing post 2, that includes support boss 3 and small diameter pin 4 is fastened to part 5 which includes slot 6 and counterbore 7. Alternately, part 5 can be configured with a through hole and mating counterbore instead of slot 6.

When parts 1 and 5 are assembled and pin 4 is addressed with a high speed rotating tool 8 whose end contains spherical radius 9, frictional heat will be developed in pin 4 as pressure is applied in the direction of arrow 10. This causes the material of pin 4 to exhibit plastic flow and move outward, following spherical radius 9 to form mushroomed head 11. Head 11, as it is formed, will force parts 1 and 5 together, creating a tight joint. This process works in an optimum fashion when the rotational speed of tool 8 is in excess of 3600 RPM and when slot (or hole) 6 is only slightly larger than the diameter of pin 4. Because support boss 3 is substantially larger than pin 4, it acts as a heat sink and prevents the surface that part 1 seats on from heating and deforming as pin 4 is mushroomed.

Normal riveting processes without frictional h...