Method for producing hexagonal washer

Details Method for producing hexagonal washer Method for producing hexagonal washer

2006-07-05

2009-11-24

Tolan, Edward (Department: 3725)

Metal deforming

By plural tool-couples

C072S405020, C470S041000, C470S162000

Reexamination Certificate

active

07621168

ABSTRACT:
Hexagonal washers are formed by the following steps: at least two through holes are provided in the middle of a belt of material, which are also used for positioning and advancing the belt; a first residual slot is formed between every two adjacent through holes; a second residual slot and a third residual slot are formed at the two sides of every first residual slot, thereby forming a hexagonal ring around each through hole; six wedge planes are forged around the bottom surface of each ring, and at least a V-shaped groove or a ridge is forged on the top surface of each ring; a larger through hole as the inner hole of a washer is produced at the center of each ring; the major shape of each washers is then formed without separating the washers from the belt; and the washers are fine-tuned to obtain the precise form factor and dimension before they separated from the belt.

REFERENCES:
patent: 2352118 (1944-06-01), Poupitch
patent: 2649125 (1953-08-01), Poupitch
patent: 2716247 (1955-08-01), Poupitch
patent: 3981060 (1976-09-01), Alling et al.
patent: 4024593 (1977-05-01), Pendell
patent: 7331874 (2008-02-01), Lin

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