| 摘要 |
1368388 Making pipe thread protectors ALCO STANDARD CORP 20 Dec 1972 [22 Dec 1971] 58817/72 Heading B3A [Also in Division B8] A method of making a double-walled thread protector 8 for the threaded end of a pipe member (70), Fig. 12 (not shown), comprises deep-drawing a first metal blank (1), Fig. 1 (not shown) and forming it into a cylindrical shape (3), Figs. 2, 3 (not shown), having an open end, a skirt wall and a closed end, punching out the closed end to provide it with an inwardly-directed flange 4i to produce a first part 4, deep drawing a second metal blank (5), Fig. 6 (not shown), to form a cylindrical shape (6), Fig. 7 (not shown), having a closed end, a skirt wall and an open end, forming an outwardly-curved flange (6a), Fig. 8 (not shown), to produce a second part 7, forming threads 4f, 4g along the skirt wall of one of the shaped parts, assembling the parts together with the flanges 4i, (6a) in contact, maintaining the skirt walls in spacedapart relation, and welding along the flanges to form an integral structure. Flanged part (3) is placed over a ribbed roll (16) which is revolved while a co-operating roll (18) moves towards and away from the roll (16). This allows periods of complementary interfitting of respective banded portions (16a)-(16e) and (18a-18e). The banded part 4 is then placed in a piercing die (19), Fig. 4 (not shown), and a portion 4h is punched out to leave the flange 4i. Threads 4f, 4g are then formed using a tapping head (31), Fig. 5 (not shown), of a lathe (25). Prior to the assembling of the two parts 4, 7, the second part 7 can be trimmed using a lathe trimming tool (52) to remove any surplus material from the flange (6a). Once assembled in a jig or lathe (55), Fig. 9 (not shown), the parts can be welded together using an oxyacetylene torch or an electrode (65), relative rotation occurring during welding between the torch or electrode and the assembled parts. A single drawing operation may replace the two drawing operations involved for the forming of each part 3, 7. The protector is made out of material suitable for operation at cryogenic temperatures, e.g. steel.
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