This article was originally published in Electrochemical and Metallurgical Industry Publication of March 1906. Information within this article is therefore correct as of 1906. The publication of this material aims to provide historical insight on the subject and its place in industry.
The Bliss Triple Action Drawing Press is designed for performing drawing operations in sheet metal, the point of novelty in its operation lying in the fact that the work is drawn twice at every stroke of the machine.
Briefly this action may be described as follows: The blank is placed on the lower die, which is raised against the stationary blank holder by the rod and cams on the outside of the frame. This holds the blank in place. Next, the outer slide is forced down by the cams to perform the preliminary drawing, after which the eccentric brings down the inner ram to draw the shell a second time. As the punches and dies return to the first position the work is ejected.
This type of metal press equipment is especially useful and economical for drawing deep seamless shells doing away entirely with annealing first operation shells, inasmuch as the second operation immediately follows the first, while the metal is still warm. Future experience only can determine the full value of the machine, but it is interesting to know that a tin shell 3 inches in diameter by 3 inches deep has been successfully made at one stroke of the press.
In the size illustrated the capacity is sufficient for a blank 11 inches in diameter and a drawing punch up to 6 inches in diameter. It will draw up to 3 inches in depth and lift out the work for that distance. The metal press equipment is of very compact construction and occupies no more room than any double-action press of the corresponding size. It may be set in an inclined position to allow the finished sheet to fall off.
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