Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Patent
1976-07-30
1977-07-26
Mehr, Milton S.
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
72234, B21B 1710
Patent
active
040374491
ABSTRACT:
The disclosure relates to method and apparatus for the operation of a plug mill, in the production of seamless tubes. Provisions are made for maintaining a circulating supply of plug and mandrel assemblies such that, after a tubular shell from a piercing mill has been given a first pass through the plug mill, the entire combination of the plug and mandrel assembly, and the just-processed shell, are transferred bodily into alignment with the axis of a second stage mill. The shell is then advanced in the same direction through a second mill stand, over a second plug, while simultaneously being stripped from the first mandrel. By enabling the shell to be passed through the second plug mill pass, without the requirement of an intermediate operation of stripping the shell from the first stage mandrel, significant time economies are realized. With conventional plug mill equipment and techniques, the plug mill represents a bottleneck in the sequence of operations involved in the production of seamless tubing. In contrast, with the method and apparatus of the invention, the plug mill can easily operate at a greater rate of speed than the piercing mill supplying tubular shells to it. This is accomplished with only a modest increase in investment in mill equipment.
REFERENCES:
patent: 1986833 (1935-01-01), Littler
patent: 2528651 (1950-11-01), Gross
patent: 3277687 (1966-10-01), Kelly
Aetna-Standard Engineering Company
Mehr Milton S.
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