Plug drawing of tubes and other hollow items

Details Plug drawing of tubes and other hollow items Plug drawing of tubes and other hollow items

1986-01-21

1987-04-07

Combs, E. Michael

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

72283, B21C 900, B21C 124

Patent

active

046550658

ABSTRACT:
A plug for use in the plug drawing of hollow tubes or other stock. A flexible and deformable seal is mounted on the rearward part of the plug. In its relaxed state this seal allows easy insertion of the plug into the stock before drawing begins. In its deformed state, which it is caused to adopt in use, it effectively seals the rearward end of a cylindrical clearance between the plug and the stock, so enabling this clearance to be filled with pressurized lubricant to improve drawing efficiency. The lubricant is supplied through passages formed in the plug and connected to a hollow conduit extending backwards within the undrawn stock. The conduit may be flexible, or may be rigid and then act as a plug bar. The plug may be in two parts which are caused, as drawing begins, to move relative to each other and in so doing to deform the seal.

REFERENCES:
patent: 2167418 (1939-07-01), Findlater
patent: 2355734 (1944-08-01), Katz
patent: 2363476 (1944-11-01), Bannister
patent: 3596491 (1971-08-01), Cress et al.

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