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Method and device for preparing unequal thickness straight seam laser welded pipe by two-step forming method

A technology of laser welding and forming method, which is applied in the direction of laser welding equipment, forming tools, feeding devices, etc., can solve the problems not mentioned in the production and manufacture of unequal-thickness welded pipes, and the inapplicability of small-caliber unequal-thickness laser welded pipes, etc., to achieve Fewer molding steps and high processing efficiency

Active Publication Date: 2016-06-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN101204720 discloses "a method for manufacturing X80 pipeline steel JCOE longitudinal submerged arc welded pipe". This method is more suitable for the production of large-diameter oil delivery pipes, but it is not suitable for the production of small-diameter unequal-thickness laser welded pipes for automobiles.
However, the invention patent does not mention the production and manufacture of unequal thickness welded pipes

Method used

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  • Method and device for preparing unequal thickness straight seam laser welded pipe by two-step forming method
  • Method and device for preparing unequal thickness straight seam laser welded pipe by two-step forming method
  • Method and device for preparing unequal thickness straight seam laser welded pipe by two-step forming method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using unequal thickness rolled plates (thicknesses are 1mm and 2mm respectively), the laser welded pipes with outer diameter of 50mm, length of 1000mm, and inner diameter of 48mm and 46mm are processed and manufactured.

[0044] The manufacturing process is:

[0045]For 1000mm-long unequal-thickness rolling plate, trim the two sides of its width, and then place the unequal-thickness steel plate on the U-shaped die frame (the 2mm thick side of the unequal-thickness steel plate and the thinner side of the punch Correspondingly), use the concave and convex dies of the U-shaped die to punch steel plates of unequal thickness into U shapes, and then place the punched U-shaped steel plates in the cavity of the O-shaped die, and use the upper die of the O-shaped die to carry The inner mandrel clamps the U-shaped steel plate between the upper mold and the lower mold of the O-shaped mold, and uses the slope of the upper and lower molds of the O-shaped mold to stamp the U-shaped s...

Embodiment 2

[0047] Using unequal thickness rolled plates (0.7mm and 1.5mm in thickness), process and manufacture laser welded pipes with an outer diameter of 30mm, a length of 600mm, and inner diameters of 28.6mm and 27mm.

[0048] The manufacturing process is:

[0049] For 600mm-long unequal-thickness rolled plates, trim the two sides of its width, and then place the unequal-thickness steel plates on the U-shaped die frame (where the unequal-thickness steel plates are 1.5mm thick and the punch is thinner corresponding side), using the concave and convex dies of the U-shaped die to punch steel plates of unequal thickness into a U shape, and then place the punched U-shaped steel plate in the cavity of the O-shaped die, and use the upper die of the O-shaped die to carry The inner mandrel clamps the U-shaped steel plate between the upper mold and the lower mold of the O-shaped mold, and uses the slope of the upper and lower molds of the O-shaped mold to stamp the U-shaped steel plate into an...

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Abstract

The invention provides a method and a device for preparing a variable-thickness longitudinal laser welded pipe in a two-step forming way. The method comprises the following steps of: 1) trimming a variable-thickness steel plate, wherein the thickness of the variable-thickness steel plate is gradually varied along the length direction; 2) placing the variable-thickness steel plate on a lower die, namely a concave die, of a U-shaped die, wherein the thickness variation of the section of an upper die, namely a convex die, along the length direction is opposite to the gradual variation of the thickness of the variable-thickness steel plate along the length direction; punching a U-shaped piece by using the variable-thickness steel plate under the matching of the upper die and the lower die; 3) placing the U-shaped variable-thickness steel plate into a cavity in the lower die, namely a concave die of an O-shaped die, wherein the upper die comprises a fixing support and a cylindrical mandril inside the fixing support; downwards moving the upper die to be matched with the lower die in order to punch the U-shaped variable-thickness steel plate into an opened O-shaped pipe with a long clearance of 2 to 15mm once; and 4) conveying the opened O-shaped pipe into a laser welding unit; narrowing the clearance by utilizing a roller clamping device; then welding with lasers to obtain a variable-thickness laser welded pipe with the same outside diameter and the variable inside diameter.

Description

technical field [0001] The invention relates to a production method of a laser welded pipe, in particular to a method and a device for preparing straight seam laser welded pipes of unequal thickness by using a two-step forming method. Background technique [0002] Laser welded pipe technology is the use of laser welding to weld the preformed pipe straight seam. The advantage of using laser welded pipe lies in its high welding quality and lower scrap rate during production and use. The use of laser welded pipe can greatly reduce the wall thickness of the pipe and use high-strength steel, which fully meets the trend of lightweight cars and high anti-collision performance requirements. As a special form of laser welded pipe, unequal thickness laser welded pipe has unique advantages, that is, the same welded pipe can have different wall thickness along the length direction. The raw materials used for unequal thickness laser welded pipes can include unequal thickness rolled plat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/08B23K26/24B21D5/06B21D37/10B21D43/00
Inventor 阎启左敦桂
Owner BAOSHAN IRON & STEEL CO LTD