Reinforced aperture in thermoplastic sheet material

Details Reinforced aperture in thermoplastic sheet material Reinforced aperture in thermoplastic sheet material

B - Operations, Transporting

26

F

18/1057

B26F 3/06 (2006.01) A45C 5/02 (2006.01) B26D 7/10 (2006.01) B26F 1/02 (2006.01)

Patent

CA 1115919

REINFORCED BEARING APERTURE IN THERMOPLASTIC SHEET MATERIAL ABSTRACT OF THE DISCLOSURE Relatively light gauye 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 The hot punch is withdrawn and replaced by a cool punch to retard further plastic flow of the displaced material, thereby fixing the aperture in desired size and shape.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 inte- grally formed locally in the sheet material. Apparatus for forming the bearing aperture is also disclosed.

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