Online filtering method for internal defect of ultrafine high-strength steel wire

Abstract

The invention provides an online filtering method for an internal defect of an ultrafine high-strength steel wire. The method comprises the following steps of: transferring a steel wire with diameter less than 0.3mm and tension strength and yield strength more than 3000MPa into a coiling device for coiling through a line wheel by adopting a pulling wheel at an outlet of a steel wire finished product die, wherein the steel wire passes through a tension wheel by which a tension force of the steel wire can be controlled; the tension force F exerted to the steel wire is ranged from F1 to F2; the F1 is shown as F1=Rp0.2' / (Phi / 4xD<2>); F2 is shown as F2=Rm'' / (Phi / 4 xD<2>), wherein D is the diameter of the steel wire; Rp0.2' is the yield strength of a common steel wire; Rm'' is the tension strength of a defected steel wire with 15 microns dimension of inclusion; if the steel wire is broken under a tension force range, the steel wire can be determined that the defect due to the inclusion more than 15 microns is contained inside. By adopting the method, the inclusion in the steel wire can be intercepted in a form of a broken wire, so that a problem in the prior art that the defect due to large inclusion in an ultrafine steel wire cannot be founded out by an online detecting and filtering method can be solved.

Description

technical field [0001] The invention relates to a semi-non-destructive on-line defect filtering technology for steel wires, in particular to an on-line filtering method for internal defects of ultra-fine high-strength steel wires, which can be used for online filtering of ultra-fine high-strength steel wires containing inclusion defects with a size exceeding 15 μm. Background technique [0002] Today's metal nondestructive testing technologies include five mainstream technologies: radiographic testing, ultrasonic testing, magnetic particle testing, penetrant testing and eddy current testing. It is mainly aimed at larger-sized metal parts and sheet metal. The only one that can be used for metal wire testing is eddy current testing, and the diameter of the wire is generally above 5mm. The diameter of the thinnest steel wire that can be detected on-line has been reported so far in the world is above 1mm. For the on-line detection and filtering of steel wire internal defects w...

AI Technical Summary

Problems solved by technology

[0003] Due to the existence of inclusion defects inside the steel, it is more or less inevitable. When the inclusion defects inside the high-strength ultra-fine steel wire are greater than a certain level, the wire will be broken in the subsequent use of the steel wire, which will result in a certain production. , or loss of use, or safety

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