Punch device for u-press in uoe steel tube manufacturing process
The technology of punching machine and punch is applied in the field of punch device for U-shaped punching machine, which can solve the problem that the U tube cannot be fed into the O-shaped punching device, etc., and achieve the effect of reducing the width of the U tube
Inactive Publication Date: 2007-04-04
NIPPON STEEL CORP
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Problems solved by technology
If such a high-strength material is processed by the conventional U-shaped punch device, the amount of springback (bending recovery) after U-shaped punching increases, so the opening width of the U tube after U-shaped punching is larger than that of the O-shaped tube. The diameter of the die of the stamping device also caused the problem that the U tube could not be fed into the O-shaped stamping device.
Method used
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Examples
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Comparison scheme
Effect test
Embodiment
[0044] Hereinafter, the present invention will be described based on examples.
[0045] In the manufacture of a UOE steel pipe with an outer diameter of 609.6 mm and a thickness of 14 mm (hereinafter referred to as "test steel pipe 1"), and a UOE steel pipe with an outer diameter of 711.2 mm and a thickness of 14 mm (hereinafter referred to as "test steel pipe 2"), The test was carried out under the following conditions. In addition, in the following tests, the U-shaped pressing method of the rocker arm assembly method was adopted, and the number of times of U-shaped pressing was set to one. In addition, the yield stress of the test steel pipes 1 and 2 was 750 MPa.
[0046] (Condition 1)
[0047] U-shaped punching of test steel pipes 1 and 2 was carried out using the punch device for a U-shaped punching machine of the present invention having a punch moving mechanism. Fig. 8 is a schematic view showing a punch device for a U-shaped press to which the present invention is ap...
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Abstract
A punch device for U-press in a UOE steel tube manufacturing process capable of coping with the various manufacturing tube sizes and reducing the width of a U-tube after U-press less than that by a conventional punch device for U-press. The punch device (100) used in the UOE steel tube manufacturing process comprises a first punch part (10) having semi-cylindrical press faces (11) and (11) on both side-faces, a second punch part (20) disposed in contact with the lower side of the first punch part (10) and having semi-cylindrical press faces (21) and (21), which are the same as or different from the press faces (11), on both side-faces, and a third punch part (30) disposed in contact with the lower side of the second punch part (20) and having a downward semi-cylindrical press face (31).
Description
technical field [0001] The present invention relates to a punch device for a U-shaped press (U press) used in the manufacturing process of a steel pipe manufactured by the UOE method. Background technique [0002] UOE steel pipe is a steel pipe used mainly for pipelines for transporting oil, natural gas, etc., and its name comes from a typical manufacturing process of the steel pipe. The manufacturing process of the UOE steel pipe, which is roughly divided into about 20 processes, includes: the process of bending the end of the steel plate (C-shaped processing), the process of producing a U-tube by U-shaped processing, and the process of forming a U-tube by O-shaped processing. Processes such as processing to produce open pipes, etc., the steel plates processed through these processes, and then undergo welding processes, expander processes, and inspection processes, etc., to become products (UOE steel pipes). [0003] Among the above-mentioned processes, the C-shaped proces...
Claims
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IPC IPC(8): B21D5/01B21C37/08
CPCB21C37/0815B21D5/01
Inventor 下本豪纪
Owner NIPPON STEEL CORP