Metal deforming – By pulling workpiece through closed periphery die – Utilizing plural metal-deforming tools
Patent
1989-07-31
1990-10-16
Crane, Daniel C.
Metal deforming
By pulling workpiece through closed periphery die
Utilizing plural metal-deforming tools
72189, B21C 124
Patent
active
049626582
ABSTRACT:
Pipes are straight drawn for reducing the pipe diameter and the pipe wall thickness. The drawing is performed intermittently through a plurality of drawing stages, each including a drawing plate having a drawing nozzle or opening through which the pipe must pass. Individual, separate drawing mandrel sections forming a set and corresponding in number to the plurality of drawing plates, are inserted in proper sequence into the pipe to be drawn. The insertion is such that the mandrel sections are located, prior to the begin of the drawing operation, between a pulling end of the pipe and a first dent. The smaller diameter mandrel sections first pass through the hole in the drawing plate and only the largest dimeter mandrel section is held in place by the first drawing plate for squeezing the pipe through that drawing plate. The smaller diameter mandrel sections travel along with the pipe as it is being drawn through the plates one after the other, whereby each plate keeps its respective mandrel section in place. A denting tool is so positioned and arranged for cooperation with the drawing tool that further dents are formed in the pipe close to, but behind the last mandrel section that passed through the nearest nozzle or drawing plate. Thus, the next dent is formed in a pipe portion which has already a reduced wall thickness while any hollow drawing is minimized. Thus, each drawing plate cooperates with its own independent mandrel section and with its own denting mechanism. At least one denting mechanism is arranged downstream of each drawing plate as viewed in the drawing direction of the pipe.
REFERENCES:
patent: 2155437 (1939-04-01), Moore et al.
patent: 2600254 (1952-06-01), Lysobey
patent: 3812702 (1974-05-01), Benteler et al.
Crane Daniel C.
Fasse W. G.
Firma Schumag AG
Kane, Jr. D. H.
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