Method of making a reinforced bearing aperture in thermoplastic

Details Method of making a reinforced bearing aperture in thermoplastic Method of making a reinforced bearing aperture in thermoplastic

1979-01-02

1979-12-25

Hoag, W. E.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

264237, 264348, B29C 1700, B29F 500

Patent

active

041805402

ABSTRACT:
Relatively light gauge thermoplastic sheet material is pierced by a hot punch to provide a bearing aperture. The hot punch is held in sheet-penetrating position long enough to cause plastic flow of displaced material and formation of a collar-like hub surrounding the aperture. The hot punch is withdrawn and replaced by a cool punch to retard further plastic flow of the displaced material, thereby fixing the aperture in desired size and shape. There results a bearing aperture having an axial length greater than the starting thickness of the sheet material, and consequently a larger bearing surface integrally formed locally in the sheet material. Apparatus for forming the bearing aperture is also disclosed.

REFERENCES:
patent: 2115122 (1938-04-01), Prudden
patent: 3012918 (1961-12-01), Schaar
patent: 3161554 (1964-12-01), Blackford
patent: 3165787 (1965-01-01), Carmack
patent: 3517410 (1970-06-01), Rapisarda
patent: 3525279 (1970-08-01), Christian
patent: 3546327 (1970-12-01), Ruda
patent: 3719736 (1973-03-01), Woodruff
patent: 3891739 (1975-06-01), Lawson
patent: 4070429 (1978-01-01), Uhlig
patent: 4132519 (1979-01-01), Reed

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