Plug drawing

Details Plug drawing Plug drawing

1987-02-17

1988-05-24

Crane, Daniel C.

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

72283, B21C 900, B21C 124

Patent

active

047457872

ABSTRACT:
A plug assembly for use in the plug drawing of tubes and like hollow workpieces. In axial succession, from front to rear, the plug comprises three parts in fixed relationship to each other: a foremost first part with a smoothly rounded nose to make smooth and positive contact with the tube at the start of drawing, a parallel-sided middle part which sizes the interior section of the product as drawing proceeds, and a long rearmost part of larger section. During drawing the confronting surfaces of the rear part and the bore of the undrawn tube define a thin cylindrical clearance, relative movement between the walls of which exercises a hydrodynamic action upon lubricant lying within the tube rearward of the plug, forcing that lubricant forward through the clearance into the region where tube and plug first make contact. Alternative plug shapes for the third part of the plug are proposed, including parallel-sided, stepped and sloping.

REFERENCES:
patent: 2306712 (1942-12-01), Poncar
patent: 2355734 (1944-08-01), Katz
patent: 2679681 (1954-06-01), Resler
patent: 3293894 (1966-12-01), Edgecombe et al.
patent: 3783663 (1974-01-01), Prajsnar et al.

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