Head mill
A head rolling mill (also bandage mill ) is a rolling mill with a roller arrangement for rolling metals, in which the roll gap is axially - that is, "in front of the head" - accessible so that, for. B. Rings can be rolled without time-consuming dismantling of the rollers.
functionality
The simplest design of a head mill is in principle a duo mill in which the rolls protrude from the stand on one side. This simple construction was partially extended by additional rollers to limit the roller gap in the axial direction and the frame was placed on its side for easier handling of the wheel tires so that the roller axes are vertical. In the latter type, the two rollers were then given a caliber and the ring / wheel tire was raised to the level of the corresponding caliber by means of a hydraulically operated table, so that all necessary profiling steps could be rolled with a rolling mill.
history
The first head rolling mill that could be sensibly used for the production of rings was invented around 1840 by the Swiss Johann Georg Bodmer and used in 1842 at PR Jackson & Co. in Manchester . A head rolling mill with vertical roll position provides the ability for the rolling of endless material a major proportion of Krupp manufacturing process of seamless tires . The head mill was further refined steadily and modified eventually for the production of rings 1887 of the present form of the ring rolling mill with displaced separate roll gaps for the radial and axial components.
swell
- Adolf Ledebur : "The mechanical processing of metals", chapter "Rolling mills for the production of ring-shaped bodies or head rolling mills", p. 520ff online at archive.org (accessed on April 19, 2010)
- Otto Johannsen: History of Iron , Verlag Stahleisen Düsseldorf 1925, p. 218 online
- Harbord, F.-W. and Hall J.-W., The metallurgy of Steel, Issue 2-1905, p. 397
- Article "Walzwerk", section "Kopfwalzwerk" in Meyers Großes Konversations-Lexikon, 1905 edition online