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Short process method for rolling thick-walled pipe by retained mandrel continuous rolling unit

A short-process, thick-walled tube technology, applied in the direction of metal rolling, etc., can solve the problems of limited spacing, short length, limited mandrel limit, thick-walled tube expansion of three-roll continuous rolling mill, etc.

Active Publication Date: 2015-11-04
烟台宝钢钢管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, limited by the distance between the mandrel-limited three-roll continuous rolling unit and the stripping unit, generally 10-12 meters, in order to ensure the normal bite of the stripping unit, the minimum rolling length of the mandrel-limited three-roll continuous rolling unit is generally 10 More than one meter, which limits the further expansion of thick-walled tubes in mandrel-limited three-roll continuous rolling mills; because according to the principle of constant volume, the thicker the wall thickness, the shorter the length; currently the domestic mandrel-limited three-roll continuous rolling mill Wall thickness generally up to 55mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, taking the three-roll continuous rolling mill with 5 stands mandrel limit as an example:

[0014] 1) Divide the mandrel-limited three-roller tandem rolling unit into two parts according to the functions. Generally, the first 3-4 stands are used as "rolling stands" for wall thickness control to realize the rolling function of the original mandrel-limited tandem rolling unit; Generally, the last 1-2 racks are used as "finished product racks" for stripping and outer diameter control, replacing the subsequent stripping machine and sizing machine;

[0015] 2) Before rolling, the mandrel advances from the initial position and is inserted into the steel pipe placed in front of the mandrel-limiting three-roll continuous rolling unit, and the front end of the mandrel advances to the first position of the "rolling stand";

[0016] 3) The steel pipe advances to the "rolling stand" for rolling. During the progress of the steel pipe, it acts simultaneously with the man...

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PUM

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Abstract

The invention discloses a short process method for rolling a thick-walled pipe by a retained mandrel continuous rolling unit. The method has the characteristics that front 3 or 4 racks of the continuous rolling unit are utilized to realize a wall thickness control function; the last 1 or 2 racks of the continuous rolling unit are utilized to realize rod falling and sizing functions; pipe falling and sizing procedures are reduced; the production-manufacturing cost is reduced; the length of a mandrel participating in rolling is reduced by more than 50% of the length of the mandrel in the conventional technology, so that the loss of the mandrel is reduced; and the retained mandrel continuous rolling unit has the capability of producing an ultra-thick-walled pipe with the wall thickness above 55mm.

Description

Technical field: [0001] The invention relates to the technical field of metallurgical machinery, in particular to a short-flow method for rolling thick-walled pipes in a mandrel-limited continuous rolling mill. Background technique: [0002] The mandrel-limited three-roll continuous rolling unit generally has 5-6 continuous rolling stands, which are used to roll the raw material capillary tube into a barren tube with uniform wall thickness. It mainly plays the role of controlling the wall thickness. In the follow-up, a matching sizing unit is required to control the outer diameter of the product. The working mechanism of the mandrel limiting three-roll rolling mill (take the 5-stand mandrel limiting three-roll rolling mill as an example): 1) After the mandrel is inserted into the inner surface of the steel pipe, the mandrel limiting three-roll rolling mill 5 The first frame and the mandrel jointly participate in the rolling of the wall thickness control; the front end of th...

Claims

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Application Information

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IPC IPC(8): B21B17/02
Inventor 杨为国徐福昌夏克东
Owner 烟台宝钢钢管有限责任公司
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