Month in the Patent Office

Abstract

A metallic airscrew blade is made from a billet of solid metal and one stage of the process involves axially upsetting or extruding the root portion of the blade. The extruding may be effected so as to produce a hollow or recess within the blade shank and this recess may be continued towards the root of the blade. A billet A after heating is rolled to rough blade form by rollers R and the root portion is then confined in a die 2 and an upsetting tool 4 is introduced so that the metal is forced out into the die and the point 5 of the die produces a hollow portion. The root is subjected to a series of such piercing operations until the blade and root have the form shown in section in Figs. 11 to 15.

Citation

(1932), "Month in the Patent Office", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 10, pp. 270-270. https://doi.org/10.1108/eb029610