CN-121994613-A - Wire cold bending crack resistance evaluation method and device, electronic equipment and storage medium

CN121994613ACN 121994613 ACN121994613 ACN 121994613ACN-121994613-A

Abstract

The invention relates to the technical field of material analysis, and discloses a method and a device for evaluating cold bending crack resistance of a wire, electronic equipment and a storage medium, wherein the method comprises the following steps: when the target wire is subjected to symmetrical cold bending according to different curvatures, radial stress and tangential stress of a preset test point under each curvature are obtained, key curvature is determined based on the tangential stress, a tangential stress influence factor is determined according to the tangential stress corresponding to the key curvature, the radial stress influence factor is determined according to the radial stress corresponding to the initial curvature, the end curvature and the later curvature, and cold bending crack resistance parameters of the target wire are determined according to the tangential stress influence factor and the radial stress influence factor. The invention can break through the limitation that the existing standard only judges whether the crack exists or not, realize the full-dimensional quantitative evaluation of the crack initiation tendency, the expansion direction and the expansion rate of the wire, cover the core key index of the cold bending crack resistance and improve the accuracy of the wire quality evaluation.

Inventors

JIANG JIALU
WU JINGSONG
WANG HAIYAN
ZHANG XIAODAN
CHEN AJIAO
ZHONG SHUQI

Assignees

厦门钨业股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (10)

1. The method for evaluating the cold bending crack resistance of the wire is characterized by comprising the following steps of: When a target wire takes a vertical line in the tangential direction of a preset test point as a symmetry axis, and symmetric cold bending is sequentially carried out according to different curvatures, acquiring radial stress and tangential stress of the preset test point under each curvature; Determining an initial bow, a tip bow, and a post bow of the target wire based on each of the bow and the shear stress; Determining a shear stress influence factor according to the first shear stress corresponding to the initial bending, the second shear stress corresponding to the tail end bending and the third shear stress corresponding to the later bending; Determining a radial stress influence factor according to the first radial stress corresponding to the initial curvature, the second radial stress corresponding to the tail end curvature and the third radial stress corresponding to the later curvature; And determining the cold-bending crack resistance parameter of the target wire according to the shear stress influence factor and the radial stress influence factor, wherein the cold-bending crack resistance parameter is used for evaluating the cold-bending crack resistance of the target wire.
2. The method of claim 1, wherein the determining the initial bow, the tip bow, and the late bow of the target wire based on the respective bow and the shear stress comprises: Sequencing the bending from small to large, and sequentially recording the shear stress corresponding to each bending after sequencing; Based on each shear stress, searching a first shear stress which exceeds a preset threshold for the first time, and taking the curvature corresponding to the first shear stress as the initial curvature; searching the largest second shear stress based on each shear stress, and taking the curvature corresponding to the second shear stress as the curvature of the tail end; And searching a third shear stress which is firstly reduced after the second shear stress based on each shear stress, and taking the curvature corresponding to the third shear stress as the later curvature.
3. The method according to any one of claims 1 or2, wherein said determining a shear stress influencing factor from a first shear stress corresponding to said initial tortuosity, a second shear stress corresponding to said end tortuosity, and a third shear stress corresponding to said later tortuosity comprises: taking the absolute value of the first tangential stress corresponding to the initial bending as a first tangential stress influence factor, taking the absolute value of the second tangential stress corresponding to the terminal bending as a second tangential stress influence factor, and taking the absolute value of the third tangential stress corresponding to the later bending as a third tangential stress influence factor; Calculating a first difference between the absolute value of the second shear stress and the absolute value of the first shear stress, and taking the ratio between the first difference and the absolute value of the second shear stress as a fourth shear stress influence factor; Calculating a second difference between the absolute value of the second shear stress and the absolute value of the third shear stress, and taking the ratio between the second difference and the absolute value of the second shear stress as a fifth shear stress influence factor.
4. A method according to claim 3, wherein said determining a radial stress influencing factor from a first radial stress corresponding to said initial tortuosity, a second radial stress corresponding to said end tortuosity, and a third radial stress corresponding to said later tortuosity comprises: Taking the absolute value of the first radial stress corresponding to the initial bending as a first radial stress influence factor, taking the absolute value of the second radial stress corresponding to the terminal bending as a second radial stress influence factor, and taking the absolute value of the third radial stress corresponding to the later bending as a third radial stress influence factor; and taking the absolute value of the sum of the second radial stress and the third radial stress as a fourth radial stress influence factor.
5. The method of claim 4, wherein said determining the cold bend crack resistance performance parameter of the target wire based on the shear stress influencing factor and the radial stress influencing factor comprises: Taking the ratio of the second shear stress influence factor to the fourth radial stress influence factor as a first cold bending crack resistance evaluation index, wherein the first cold bending crack resistance evaluation index characterizes the axial cold bending crack resistance of the target wire; and taking the ratio of the fifth shear stress influence factor to the second radial stress influence factor as a second cold bending crack resistance evaluation index, wherein the second cold bending crack resistance evaluation index characterizes the radial cold bending crack resistance of the target wire.
6. The method of claim 5, wherein, after optionally selecting the first wire and the second wire in a range having a wire greater than or equal to the first threshold and less than or equal to the second threshold and determining the corresponding cold roll crack resistance parameter, the method further comprises: Comparing the first cold bending crack resistance evaluation indexes of the first wire material and the second wire material, and comparing the second cold bending crack resistance evaluation indexes of the first wire material and the second wire material to obtain an evaluation result, wherein in the evaluation result, the first cold bending crack resistance evaluation index is larger, the second cold bending crack resistance evaluation index is smaller, and the cold bending crack resistance of the corresponding wire material is relatively better.
7. The method according to claim 1, wherein the target wire is fixed to the die according to different curvatures, and the obtaining radial stress and tangential stress of the preset test point under each curvature when the symmetrical cold bending is sequentially performed according to the different curvatures includes: Adjusting the height of the die to an original height so that a laser positioning light spot of an X-ray diffractometer is in a line diameter range of the target wire, determining a height floating value according to the radius of the target wire, and determining a first height floating upwards and a second height floating downwards according to the height floating value by taking the original height as a reference; For any curvature, controlling an X-ray diffractometer to measure the preset test point according to the original height, the first height and the second height respectively to obtain a plurality of radial stress measurement values and a plurality of shear stress measurement values; And averaging the plurality of radial stress measurement values to obtain the radial stress, and averaging the plurality of shear stress measurement values to obtain the shear stress.
8. A wire cold bending crack resistance evaluation device, characterized in that the device comprises: the stress measurement module is used for acquiring radial stress and tangential stress of the preset test point under each bending degree when the target wire takes a vertical line in the tangential direction of the preset test point as a symmetry axis and sequentially carries out symmetrical cold bending according to different bending degrees; A bending degree determining module for determining an initial bending, a terminal bending and a later bending of the target wire based on the bending and the shear stress; The first factor determining module is used for determining a shear stress influence factor according to the first shear stress corresponding to the initial bending, the second shear stress corresponding to the tail end bending and the third shear stress corresponding to the later bending; The second factor determining module is used for determining a radial stress influence factor according to the first radial stress corresponding to the initial bending, the second radial stress corresponding to the tail end bending and the third radial stress corresponding to the later bending; The crack resistance evaluation module is used for determining the cold bending crack resistance parameter of the target wire according to the shear stress influence factor and the radial stress influence factor, and the cold bending crack resistance parameter is used for evaluating the cold bending crack resistance of the target wire.
9. An electronic device, comprising: A memory and a processor, the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, so as to execute the wire cold bending crack resistance evaluation method according to any one of claims 1 to 7.
10. A computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the wire cold bend crack resistance evaluation of any one of claims 1 to 7.

Description

Wire cold bending crack resistance evaluation method and device, electronic equipment and storage medium Technical Field The invention relates to the technical field of material analysis, in particular to a method and a device for evaluating cold bending crack resistance of a wire, electronic equipment and a storage medium. Background The application range of drawn wires is very wide. For example, the steel wire has the advantages of high strength and good flexibility, is one of key materials in aviation, large-span bridge, nuclear industry and other industries, and the tungsten wire is an important material for manufacturing filaments, kinescope filaments, vapor deposition heat, thermocouples, electrodes, junction devices, high-temperature heating elements and the like of various lighting lamps. Therefore, quality control of the wire is very important. The existing industry and national standards prescribe various performance indexes for monitoring the quality of wires, for example, a wire winding method, a bending method and a push-pull method are respectively adopted for testing the cracking resistance of tungsten wires with different diameter specifications and different purposes, and whether the tungsten wires have cracks is taken as a judging standard. However, the above methods have limitations for material development work. Firstly, the operation is rough and easy to apply uneven force, so that deviation occurs in the result, secondly, whether cracks occur or not is used for judging the plastic deformation capacity of the wire, the quality grade of division is not fine enough, and finer guidance can not be provided for process parameter adjustment. The limitations described above result in an inability to accurately judge wire quality. Disclosure of Invention The invention provides a wire cold bending crack resistance evaluation method, a device, electronic equipment and a storage medium, which are used for solving the problem that the quality of a wire cannot be accurately judged. According to the method, when a target wire is subjected to symmetrical cold bending according to different curvatures in sequence by taking a vertical line in the tangential direction of a preset test point as a symmetry axis, radial stress and tangential stress of the preset test point under each curvature are obtained, initial curvature, tail end curvature and later curvature of the target wire are determined based on each curvature and tangential stress, a tangential stress influence factor is determined according to first tangential stress corresponding to the initial curvature, second tangential stress corresponding to the tail end curvature and third tangential stress corresponding to the later curvature, a radial stress influence factor is determined according to the first radial stress corresponding to the initial curvature, second radial stress corresponding to the tail end curvature and third radial stress corresponding to the later curvature, cold bending crack resistance parameters of the target wire are determined according to the tangential stress influence factor and the radial stress influence factor, and the cold bending crack resistance parameters are used for evaluating cold bending crack resistance of the target wire. According to the method for evaluating the cold bending crack resistance of the wire, when the target wire is subjected to symmetrical cold bending according to different curvatures, the radial stress and the tangential stress of the preset test points under each curvature are obtained, the initial curvature, the tail end curvature and the later curvature are determined based on the tangential stress in the curvatures, the tangential stress influence factors are determined according to the tangential stress corresponding to the initial curvature, the tail end curvature and the later curvature, and the radial stress influence factors are determined according to the radial stress corresponding to the initial curvature, the tail end curvature and the later curvature, so that the cold bending crack resistance parameters of the target wire can be determined according to the tangential stress influence factors and the radial stress influence factors, the limitation that the existing standard only judges whether cracks exist or not is broken, the full-dimensional quantitative evaluation of the crack initiation tendency, the expansion direction and the expansion rate of the wire is realized, the core key indexes of the cold bending crack resistance are covered, and the accuracy of wire quality evaluation is improved. In an alternative embodiment, the initial bending, the tail end bending and the later bending of the target wire are determined based on each bending and the shear stress, and the method comprises the steps of sorting the bending from small to large, sequentially recording the shear stress corresponding to each bending after sorting, searching for a first shear stress which exceeds