Plug-retaining device for use in piercing and plugging mills

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work

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Details

72209, B21B 2502

Patent

active

039317242

ABSTRACT:
A device for use in piercing and plugging mills, comprising a rod with a plug and a gear, for keeping the rod from longitudinal displacements under the effect of the load arising during the piercing or plugging. The gear includes a fixed thrust bearing accommodating a revolving casing through which passes the rod that reciprocates in operation. A part of the internal surface of the revolving casing forms a working cone that faces the plug with its base. The gear also includes a lock to fix the rod when piercing or plugging a billet, and preferably mounted on the rod, and a drive for carrying the rod with the plug. The lock mounts a spring-biased cone positively encompassed round the circumference with radially floating cams. Before piercing, the spring-biased cone is slightly drawn off by the spring from the cams so that the latter can enter the lock which is then able to enter the casing. At the moment piercing is effected, the cone, admitted together with the cams into the casing, gets completely between the cams, forcing them against the working cone of the casing and blocking up (wedging) the rod within the casing. Piercing or plugging completed, the spring draws the cone off again from the cams, the latter enter, and the rod with the plug can be displaced by the drive into its initial position.

REFERENCES:
patent: 2480381 (1949-08-01), Offutt
patent: 2780119 (1957-02-01), Holmquist
patent: 3030835 (1962-04-01), Krause

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