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A method of improving the service life of cold rolling pipe mill passes

A technology of cold-rolled tubes and machine holes, applied in the field of cold-rolling of metal pipes, can solve the problems of restricting production efficiency, increasing rolling costs, and low service life, reducing rolling costs, improving the service life of pass shapes, and improving resistance to corrosion. The effect of fatigue performance

Active Publication Date: 2018-01-12
西北锆管有限责任公司 +1
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  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for improving the service life of the cold-rolled pipe mill pass, which solves the problems of increasing the rolling cost and restricting the production efficiency due to the low service life of the existing cold-rolled pass

Method used

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  • A method of improving the service life of cold rolling pipe mill passes
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  • A method of improving the service life of cold rolling pipe mill passes

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] A kind of method that the present invention provides to improve the pass life of cold-rolled pipe mill comprises the following steps:

[0020] The first step is to carry out trial rolling to the finished cold-rolled pass 1 after fine grinding, to ensure that the cold-rolled pass 1 meets the rolling quality requirements, that is, to ensure that the cold-rolled pass 1 made by the trial rolling meets the design requirements;

[0021] The second step, see figure 1 and figure 2 , the pass 1 is provided with a keyway 2, a marking area 3 and a pass groove 4. According to the position of the pass groove 4, the maximum stress area of ​​the pass groove 4 is regarded as the laser shock strengthening area 5-1, and in the laser shock strengthening area 5 An area is added on both sides of -1 as the laser shock strengthening boundary transition ar...

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Abstract

The invention discloses a method for prolonging the service life of a caliber of a cold reducing mill. The method comprises the following steps: carrying out trial rolling on a finished-product cold milling caliber which is finely milled, so as to ensure that the cold milling caliber meets rolling requirements; taking a maximum stress region of a caliber groove as a laser impact strengthening region; arranging one region at each of two sides of the laser impact strengthening region as a laser impact strengthening boundary transition region; carrying out laser impact strengthening treatment on the laser impact strengthening region and the laser impact strengthening boundary transition region. According to the method for prolonging the service life of the caliber of the cold reducing mill, provided by the invention, a laser impact strengthening technology is combined with a cold milling caliber method; the laser impact strengthening treatment is carried out on the caliber of the cold reducing mill, so that the anti-fatigue performance of the stress region of the cold milling caliber groove is improved, and the service life of the caliber is prolonged by times; the rolling production efficiency of a metal tubular product is greatly improved when the caliber replacement efficiency is reduced; the rolling cost of the metal tubular product is also reduced by times.

Description

technical field [0001] The invention belongs to the technical field of cold rolling of metal pipes, and in particular relates to a method for improving the pass life of a cold rolling pipe mill. Background technique [0002] Rolling is the main forming method of metal pipes. Rolling is carried out by installing a pair of ring passes on the rolling mill. Through the upper and lower pairs of cross-section passes and tapered core heads, the mutual changes are repeated during the reciprocating movement of the machine head. The pipe diameter is reduced and the wall thickness is thinned. In the process of pipe rolling, the tensile stress (the component along the transverse direction of the groove) of the cold-rolled groove has a cyclical characteristic, which will lead to fatigue cracking failure of the groove, which is the cause of the failure of the cold-rolled pipe mill. main mode. On the one hand, the service life of the cold-rolled pass restricts the rolling production effi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C21D9/40
CPCC21D9/40C21D10/005
Inventor 毛继军施迁石鸿瑞李晓珊彭胜吴楠高博李小影李国杰
Owner 西北锆管有限责任公司
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