Tube manufacturing method and apparatus for fixed diameter rolling

A manufacturing method and sizing technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as wrinkles on the inner surface of tubes, and achieve the effect of suppressing wrinkles, suppressing occurrence and expansion

Inactive Publication Date: 2007-01-31
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this can be considered to be that because the sizing rolling device does not use tools to constrain the inner surface of the tube when sizing and rolling the tube, it is easy to generate wrinkles on the inner surface of the tube.

Method used

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  • Tube manufacturing method and apparatus for fixed diameter rolling
  • Tube manufacturing method and apparatus for fixed diameter rolling
  • Tube manufacturing method and apparatus for fixed diameter rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] One embodiment of the present invention will be described below with appropriate reference to the drawings.

[0031] figure 1 It is a diagram schematically showing a 3-high sizing rolling apparatus to which a method for manufacturing a pipe according to an embodiment of the present invention is applied. Such as figure 1 As shown, in the sizing rolling device of this embodiment (in this embodiment, a tension reducing mill for hot sizing rolling) 1, in a plurality (N, in this embodiment, N= 17) Stands #1 to #N are respectively provided with three grooved rolls 10 with an included angle of 120° in the pressing direction, and the rolling directions of the rolls 10 are alternately arranged by staggering 60° between adjacent stands. The pipe P to be rolled is passed through the pass formed by the rolls of each stand, and sizing rolling is performed on the exit side of the final stand #N so that the outer diameter becomes a predetermined value. In addition, when the outer...

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PUM

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Abstract

A tube manufacturing method, comprising a step for rolling a tube at a fixed diameter by using an apparatus for fixed diameter rolling formed of a plurality of stands having a plurality of hole type rolling rolls. The method is characterized in that, where the minimum value of angles formed by the tangents drawn on the opposed edge parts of the hole type rolling rolls adjacent to each other in all stands is beta (deg), the outer diameter of the tube on the out-side of the apparatus for fixed diameter rolling is D (mm), and the wall thickness of the tube on the out-side of the apparatus for fixed diameter rolling is t (mm), such a hole type rolling roll that the angle beta can fulfill the requirement of the following expression (1) is used. beta >= 1.13 x 10 x Ln (t/D x 100) + 1.37 x 10<2> ... (1).

Description

technical field [0001] The present invention relates to a pipe manufacturing method and a sizing rolling device. The sizing rolling device has a plurality of grooved rolls with at least two rolls in each stand. When the device performs sizing rolling on the tube, it can effectively suppress the occurrence and expansion of wrinkles that may occur on the inner surface of the tube. Background technique [0002] Usually, in the process of processing the outer diameter of the pipe to a predetermined value, a sizing rolling device such as a sizing machine or a tension reducing machine is used. As such a sizing rolling device, a 3-high type sizing rolling device is known, which has three grooved rolls (hereinafter appropriately referred to as "rolls") having an included angle of 120° in the rolling direction in each stand. In addition, there is also known a 4-roller type sizing rolling apparatus having four grooved rolls having an angle of 90° in each stand in the rolling directio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B17/14B21B27/02
CPCB21B17/14B21B27/024
Inventor 稻毛孝光奥井达也
Owner NIPPON STEEL CORP
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