Metal fusion bonding – Process – With shaping
Patent
1991-07-29
1994-04-12
Heinrich, Samuel M.
Metal fusion bonding
Process
With shaping
228 17, 228 175, 72 52, 72181, 72368, B23K 3704
Patent
active
053018699
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL FIELD
The present invention relates to a machine for manufacturing welded steel pipes, and a method for handling the machine.
BACKGROUND ART
(A) Line constitution
A welded steel pipe manufactured by roll forming a steel strip to shape a pipe and welding its butted seam is already well known. Recently, an electrically seamed steel pipe manufactured by electrically (resistance) welding of a seam is mainly produced.
For one of the roll forming methods in this case, by the way, there is a whole width reduction bending method in which a strip is bent in whole, with gradually reducing its width, so as to make the whole of a pipe round. As to the forming machines belonging to this method, there are known one shown in FIG. 11 and FIG. 12, supplied by Yoda Co. in U.S.A. (disclosed in the official gazette of Japanese Patent Application Laid-open No. 29,896/1970) and another one shown in FIG. 13 to FIG. 15, supplied by Thorans Co. in U.S.A. (the official gazette of Japanese Utility Model Publication No. 28,897/1971). In the figures, the reference numeral 100 represents a pre-forming roll, 102, 104, 106 and 108: break-down rolls, 110 . . . : inner rolls, EF: an edge forming roll, CR: cage rolls, 1F, 2F and 3F: fin pass rolls, and SQ: a squeezing roll, respectively.
However, these machines have such defects as follows: roll. to be produced is narrow, form due to the influence of rolls (See: FIG. 16), and bending work can not be satisfactorily carried out in the rough and intermediate forming courses, and in practice, it is required to provide at least three stages of fin pass rolls.
In order to overcome these defects, such a forming machine as shown in FIG. 17 and FIG. 18 has first been developed (the official gazette of Japanese Patent Application Laid-open No. 135,428/1986). This machine is composed so that an edge forming roll EF, first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB and a large number of cage rolls CR . . . arranged on both the sides of these center bending rolls, a plurality of fin pass rolls 1F, 2F and 3F, and a squeezing roll SQ, are arranged in order from the upstream side to the downstream side, wherein the edge forming roll EF serves to bend the pipe edge portions of a strip (FIG. 18a), the first to third center bending rolls 1CB, 2CB and 3CB and the cage rolls CR . . . serve to bend the boundaries of the pipe side portions of the strip and the pipe bottom portion thereof (FIGS. 18b, c and d), the fourth center bending roll 4CB and the cage rolls CR . . . serve to bend the pipe bottom portion (FIG. 18e) so that a pipe is U-shaped in cross section (FIG. 18f ), and the fin pass rolls 1F, 2F and 3F serve to further form the pipe under pressure so that the pipe side portions are protruded, and the pipe edge portions, the boundaries between the pipe edge portions and pipe side portions and the boundaries between the pipe side portions and pipe bottom portion are bent and unbent, and a welder serves to weld the resulting seam and the squeezing roll SQ serve to upset bond the said seam.
Also in this case, there are practically such defects as follows:
1 Since the first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB serve to bend only the boundaries between the pipe side portions and pipe bottom portion and the pipe bottom portion and they are therefor arranged at the center of the strip within a range as wide as one-third of its width (FIGS. 18b to d), and since the first to third center bending rolls 1CB, 2CB and 3CB each comprises a twin type split roll, the contact area of these rolls with the strip is small. Even if all the center bending rolls are driven, accordingly, the transmission of feed torque from the rolls to the strip can not be carried out satisfactorily, and as a result, the strip can not be made to progress smoothly.
In order to drive all the center bending rolls, it is necessary to make the machine large-scaled and it is difficult to ensure the space where the cage rolls are to be installed, also leading to the increase of installation expense.
2 Since the
REFERENCES:
patent: 4299108 (1981-11-01), Kato et al.
patent: 4865243 (1989-09-01), Meier
Hashimoto Yuuji
Ide Tsutomu
Itadani Susumu
Toyooka Takaaki
Heinrich Samuel M.
Kawasaki Steel Corporation
Miller Austin R.
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