CN-122015724-A - Method for measuring thickness of wire rod iron scale

CN122015724ACN 122015724 ACN122015724 ACN 122015724ACN-122015724-A

Abstract

The invention provides a method for measuring the thickness of a wire rod iron scale, and belongs to the technical field of material analysis and test. The method comprises the steps of intercepting a wire rod to be detected with a preset length to prepare a sample, grinding and polishing a detection surface of the sample to obtain a smooth detection surface, collecting an electronic image of the detection surface through a scanning electron microscope, and determining the thickness of a wire rod iron scale based on the electronic image. The method comprises the steps of intercepting a wire rod to be detected to prepare a sample, grinding and polishing the sample, obtaining an electronic image through a scanning electron microscope, measuring the thickness of a plurality of iron scales, and determining the maximum value, the minimum value and the average value based on the thickness of the plurality of iron scales to realize comprehensive and accurate representation of the thickness of the iron scales of the wire rod, so that the problem that the microstructure of the iron scales cannot be accurately and quantitatively represented by conventional metallographic microscope detection is solved, accurate basis is provided for subsequent iron scale removal, and the efficiency of iron scale removal is improved.

Inventors

ZHONG LILI
GUO DAYONG
YAN PINGYUAN
HUANG LEI

Assignees

鞍钢股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (6)

1. The method for measuring the thickness of the wire rod iron scale is characterized by comprising the following steps of: Intercepting a wire rod to be detected with a preset length to prepare a sample; grinding and polishing the detection surface of the sample to obtain a smooth detection surface; Collecting an electronic image of a detection surface through a scanning electron microscope; And determining the thickness of the coil oxide scale based on the electronic image.
2. The method of claim 1, wherein the intercepting a predetermined length of wire rod to be tested for preparing a sample comprises: and cutting out the wire rod to be detected of 1-2cm along the radial direction by adopting a linear cutting process to serve as a sample.
3. The method of claim 1, wherein lapping the test surface of the sample to obtain a smooth test surface comprises: taking the radial cross section of the wire rod as a detection surface; grinding the detection surface of the sample by using sand paper; and polishing the detection surface by using a polishing agent after grinding until the detection surface is smooth and has no scratches.
4. The method of claim 1, wherein capturing an electronic image of the detection surface by a scanning electron microscope comprises: acquiring an image of a detection surface based on preset working parameters, wherein the preset working parameters comprise: The accelerating voltage is 15kV-25kV, the working distance is 9mm-10mm, the magnification is 500-5000 times, and the scanning speed is 10-30 seconds/frame.
5. The method of claim 4, wherein the predetermined operating parameters further comprise a brightness setting of 60% -80% full scale value and a contrast setting of 40% -60% full scale value.
6. The method of claim 1, wherein the determining a wire rod scale thickness based on the electronic image comprises: Identifying the interface boundary of the iron oxide scale and the matrix by adopting a gray threshold algorithm, and positioning the interface of the iron oxide scale layer based on the image gray abrupt change characteristics; And drawing a measuring line segment along the normal direction of the interface by an image analysis tool, and obtaining the pixel distance of boundary coordinates at two ends as the thickness of the iron oxide scale.

Description

Method for measuring thickness of wire rod iron scale Technical Field The invention relates to the technical field of material analysis and test, in particular to a method for measuring the thickness of a wire rod iron scale. Background In the wire drawing production process of industrial wires, the residual iron oxide scale on the surface of the wire rod can have a significant influence on subsequent processing. The existence of the iron scale not only damages the surfaces of the drawing die and the steel wire and shortens the service life of the die, but also can cause production problems such as wire breakage and the like. The main iron scale removing method at present comprises two processes of acid washing descaling and mechanical dephosphorization. The pickling and descaling process requires a wire rod to have a thinner iron oxide skin layer so as to shorten the pickling time and improve the acid liquor utilization rate, while the mechanical dephosphorization process requires a thicker iron oxide skin layer so that the iron sheet is in a blocky falling off state in the repeated bending process, thereby improving the descaling effect and reducing the surface residual rate. Therefore, the accurate measurement of the thickness of the iron scale and the layered structure thereof has important significance for the selection and optimization of the production process. In the prior art, the nitrate alcohol corrosion method cannot effectively distinguish the structures of all layers of the iron scale, and quantitative and qualitative measurement of the thickness and the proportion of all layers is difficult to realize. The existing X-ray diffraction method can achieve the detection purpose, but has the problems of high detection cost, difficult sample preparation and the like, and is not beneficial to achieving the high-efficiency and low-cost detection of the oxide scale microstructure. In addition, the method has long analysis time and low efficiency, and is difficult to provide timely and effective guidance for production. These technical defects severely restrict the accuracy and timeliness of the scale detection. Therefore, a method for measuring the thickness of the wire rod scale is needed. Disclosure of Invention In view of the above, the invention provides a method for measuring the thickness of the iron scale of the wire rod, which adopts a scanning electron microscope to measure the thickness of the iron scale on the surface of the wire rod, and combines the accuracy and timeliness of the iron scale detection. For this purpose, the invention provides the following technical scheme: A method for measuring the thickness of a wire rod iron scale comprises the following steps: Intercepting a wire rod to be detected with a preset length to prepare a sample; grinding and polishing the detection surface of the sample to obtain a smooth detection surface; Collecting an electronic image of a detection surface through a scanning electron microscope; And determining the thickness of the coil oxide scale based on the electronic image. Further, the intercepting the wire rod to be detected with the preset length prepares a sample, which comprises the following steps: and cutting out the wire rod to be detected of 1-2cm along the radial direction by adopting a linear cutting process to serve as a sample. Further, grinding and polishing the detection surface of the sample to obtain a smooth detection surface, including: taking the radial cross section of the wire rod as a detection surface; grinding the detection surface of the sample by using sand paper; and polishing the detection surface by using a polishing agent after grinding until the detection surface is smooth and has no scratches. Further, the capturing the electronic image of the detection surface by the scanning electron microscope includes: acquiring an image of a detection surface based on preset working parameters, wherein the preset working parameters comprise: The accelerating voltage is 15kV-25kV, the working distance is 9mm-10mm, the magnification is 500-5000 times, and the scanning speed is 10-30 seconds/frame. Further, the preset working parameters further comprise brightness setting to 60% -80% full range value and contrast setting to 40% -60% full range value. Further, the determining the thickness of the wire rod scale based on the electronic image comprises: Identifying the interface boundary of the iron oxide scale and the matrix by adopting a gray threshold algorithm, and positioning the interface of the iron oxide scale layer based on the image gray abrupt change characteristics; And drawing a measuring line segment along the normal direction of the interface by an image analysis tool, and obtaining the pixel distance of boundary coordinates at two ends as the thickness of the iron oxide scale. The invention has the advantages and positive effects that: The method comprises the steps of intercepting a wire rod to be detected to prepare