Metal Forming by John D. Beadle (eds.)

By John D. Beadle (eds.)

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Tube forming A circular tube is one of the most simple sections that can be formed by longitudinal rolling and some 4% of world steel production is formed and welded into tubing using this technique. The tube mill comprises a train of rolls which continuously form the coiled strip or sheet into a circular cross section and guide the formed section through a welding head to weld the seam. Fig. 18. Schematic diagram of rotating wedge rolling principle. ~::;DB I 2 3 4 ~ 5 6 7 8 8 Fig. 19. The sequence of passes used to roll a channel.

Coarse thread rolling. metallic inclusions, is much reduced and overall the rotary piercing process is made more tolerant. Oblique rolling Another example of transverse rolling is the production of discrete workpieces from long bar. The bar is heated to a temperature of 900-1 000°C and is fed continuously into a pair of rotating rolls, machined with a continuous helical groove of appropriate profile. As with reeling and rotary piercing, the rolls are inclined at a slight angle to the horizontal to produce a force for forward feed.

Group 2 Thickness tolerances. Ejector mark tolerances. Group 3 Straightness and flatness tolerances. Tolerances for centre-to-centre dimensions. Group4 Fillet and edge radii tolerances. Burr tolerances. Surface tolerances. Tolerances on draft angle surfaces. Eccentricity tolerances for deep holes. Tolerances for unforged stock. Tolerances for deformation and sheared ends. The meaning of some of these terms is shown in Fig. 20. BS4114 lists tolerances in weight ranges in tabular form in both British and metric units.

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