CN115870541A - Method for improving trimming quality of cold-rolled strip steel - Google Patents
Method for improving trimming quality of cold-rolled strip steel Download PDFInfo
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- CN115870541A CN115870541A CN202111139220.9A CN202111139220A CN115870541A CN 115870541 A CN115870541 A CN 115870541A CN 202111139220 A CN202111139220 A CN 202111139220A CN 115870541 A CN115870541 A CN 115870541A
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Abstract
The application relates to the technical field of steel rolling, in particular to a method for improving the trimming quality of cold-rolled strip steel, which comprises the steps of obtaining the cold-rolled strip steel; continuously annealing the cold-rolled strip steel to obtain a first steel; according to the thickness of the first steel, obtaining the technological parameters of disc shearing; carrying out disc shearing on the first steel according to the process parameters to obtain cold-rolled strip steel with high trimming quality; the process parameters comprise a lateral clearance value and a shear blade overlap degree, the lateral clearance value and the thickness of the first steel material are in a positively correlated linear relationship, and the shear blade overlap degree is in a first-increasing and then-decreasing correlation relationship along with the increase of the thickness of the first steel material; the parameters of the disc shearing process in the continuous annealing stage of the cold-rolled strip steel are controlled, the process parameters of the disc shearing are controlled by using the thickness of the steel, the overlong height of burrs on a formed cut surface is prevented, and the purpose of reducing the height of the burrs at the edge cutting part of the steel with lower strength is realized.
Description
Technical Field
The application relates to the technical field of steel rolling, in particular to a method for improving the trimming quality of cold-rolled strip steel.
Background
After the cold-rolled strip steel is subjected to continuous annealing treatment and galvanizing treatment, the edge of the strip steel needs to be trimmed by using a circle shear, and the purpose of trimming is to accurately control the width size of the strip steel according to the product specification requirement on one hand and to remove the edge defect on the other hand.
At present, aiming at the defect of fine burrs, the conventional solution is to utilize a burr roller in the subsequent process to carry out burr treatment in an extrusion mode, but the height of the fine burrs at the cut part has obvious influence on the burr removing effect of the burr roller and the quality of a final product, particularly, the method is most obvious by IF steel with lower strength, and has the problems of large trimming difficulty, large amount of fine burrs and high height of the fine burrs, and the appearance and the quality of the final IF steel product are influenced by the excessively high fine burrs. Therefore, how to reduce the burr height of the edge cutting part of the steel with lower strength is a technical problem to be solved urgently at present.
Disclosure of Invention
The application provides a method for improving the trimming quality of cold-rolled strip steel, which aims to solve the technical problem that the burr height of the trimming part of steel with lower strength cannot be reduced in the prior art.
In a first aspect, the present application provides a method for improving the quality of cold-rolled strip steel edge cutting, comprising:
obtaining cold-rolled strip steel;
continuously annealing the cold-rolled strip steel to obtain a first steel;
according to the thickness of the first steel, obtaining technological parameters of disc shearing;
carrying out disc shearing on the first steel according to the process parameters to obtain cold-rolled strip steel with high trimming quality;
the process parameters comprise a lateral clearance value and a shear blade overlap degree, the lateral clearance value and the thickness of the first steel material are in a positively correlated linear relationship, and the shear blade overlap degree is in a first-increasing and then-decreasing correlation relationship along with the increase of the thickness of the first steel material.
Optionally, the linear relationship is: when the thickness h of the first steel material 1 H is less than or equal to 0.3mm 1 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 1 +0.005；
When the thickness h of the first steel material 1 Satisfy 0.4mm < h 1 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 1 +0.005；
When the thickness h of the first steel material is 1 Satisfy 1.4mm < h 1 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 1 +0.015；
When the thickness h of the first steel material 1 Satisfy 2.6mm < h 1 When the thickness is less than or equal to 3.3mm, the lateral clearance value GAP =0.023.
Optionally, the correlation relationship is: when the thickness h of the first steel material 1 H is less than or equal to 0.3mm 1 When the thickness is less than or equal to 0.7mm, the overlapping degree LAP of the cutting edges is =0.43;
when the thickness h of the first steel material 1 Satisfy 0.7mm < h 1 When the diameter is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 1 +0.11；
When the thickness h of the first steel material 1 Satisfy 1.3mm < h 1 When the diameter is less than or equal to 2.8mm, the overlap degree LAP of the cutting edges is =0.164h 1 +0.976；
When the thickness h of the first steel material is 1 Satisfy 2.8mm < h 1 When the thickness is less than or equal to 3.3mm, the overlap degree LAP of the cutting edges is =0.45.
Optionally, before obtaining the process parameter of the disc shearing according to the thickness of the first steel material, the method further includes:
and galvanizing the first steel to obtain the galvanized first steel.
Optionally, the linear relationship is: thickness h of the first steel material after galvanization 2 H is less than or equal to 0.3mm 2 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 2 ；
Thickness h of the first steel material after galvanization 2 Satisfy 0.4mm < h 2 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 2 +0.01；
Thickness h of the first steel material after galvanization 2 Satisfies the condition that h is more than 1.4mm 2 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 2 +0.02；
Thickness h of the first steel material after galvanization 2 H is more than 2.6mm 2 When the thickness is less than or equal to 3.3mm, the lateral clearance value GAP =0.023.
Optionally, the correlation relationship is: thickness h of the first steel material after galvanization 2 H is less than or equal to 0.3mm 2 When the diameter is less than or equal to 0.7mm, the overlap LAP of the shearing edge is =0.33;
thickness h of the first steel material after galvanization 2 H is more than 0.7mm 2 When the diameter is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 2 +0.1；
Thickness h of the first steel material after galvanization 2 Satisfy 1.3mm < h 2 When the length is less than or equal to 2.8mm, the overlap LAP of the cutting edge is =0.164h 2 +0.876；
Thickness h of the first steel material after galvanization 2 Satisfy 2.8mm < h 2 When the thickness is less than or equal to 3.3mm, the overlap degree LAP of the cutting edges is =0.4.
Optionally, the cut surface of the first steel material includes a crush zone, a cut zone, a tear zone and a burr zone, and the area ratio of the crush zone, the cut zone, the tear zone and the burr zone is 0.03-0.01: 0.6-0.8: 0.3-0.4: 0-0.1.
Optionally, the ratio of the area of the cutting area to the area of the cutting surface is 0.6-0.8.
Optionally, the height of the burr area of the cut surface is 21-26 μm or 2-4 μm.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method for improving the trimming quality of the cold-rolled strip steel, parameters of a disc shearing process in the continuous annealing and galvanizing stages of the cold-rolled strip steel are controlled, the technological parameters of disc shearing are controlled by using the first steel thickness, and therefore the technological parameters of disc shearing are controlled according to the steel thickness, the shearing force is adjusted according to the thickness, the phenomenon that the height of burrs on a formed cutting surface is too long is avoided, and the purpose that the height of burrs at the trimming part of the steel with lower strength is reduced is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic flow chart of a method for improving the quality of cold-rolled strip steel edge cutting provided by the embodiment of the application;
FIG. 2 is a schematic flow chart of a method for improving the quality of cold-rolled strip steel edge cutting provided by the embodiment of the application;
FIG. 3 is a schematic structural diagram of a cut surface of a method for improving the quality of cold-rolled strip steel trimming provided by an embodiment of the application;
FIG. 4 is a schematic diagram of the edge burr appearance of the first steel material in the method for improving the quality of the cold-rolled strip steel edge trim according to comparative example 2;
FIG. 5 is a schematic diagram of the edge burr profile of the first steel material according to the method for improving the quality of the cold-rolled strip steel edge trim provided in embodiment 10 of the present application;
FIG. 6 is a schematic diagram of the edge burr appearance of the first steel material after galvanization in the method for improving the quality of the cold-rolled strip steel edge trim according to comparative example 1 of the present application;
fig. 7 is a schematic diagram of the appearance of the edge burrs of the galvanized first steel material in the method for improving the quality of the cold-rolled steel strip edge trim provided in embodiment 1 of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The idea of the application is as follows: the strip steel is subjected to continuous annealing treatment and galvanizing treatment, and products are required to be subjected to disc shearing and trimming, the trimming positions after disc shearing are not uniform but are divided into four different areas, different appearance characteristics are presented, and a pressing area, a cutting area, a tearing area and a burr area are respectively arranged from the upper surface to the lower surface, as shown in figure 4, wherein the pressing area is characterized in that a cutting edge can be pressed out of a small round angle during shearing, the cutting area is characterized in that uniform streaks are formed in the thickness direction, the tearing area is characterized in that the section is rough, and the burr area is characterized in that burrs exceeding the thickness are also called as a trimming area.
In one embodiment of the present application, as shown in fig. 2, there is provided a method for improving the quality of cold-rolled steel strip edge cutting, the method comprising:
s1, obtaining cold-rolled strip steel;
s2, continuously annealing the cold-rolled strip steel to obtain first steel;
s3, obtaining technological parameters of disc shearing according to the thickness of the first steel;
s4, carrying out disc shearing on the first steel according to the technological parameters to obtain cold-rolled strip steel with high trimming quality;
the process parameters comprise a lateral clearance value and a shear blade overlapping degree, the lateral clearance value and the thickness of the first steel material are in a positive correlation linear relationship, and the shear blade overlapping degree is in a correlation relationship of increasing first and then decreasing along with the increase of the thickness of the first steel material.
In this application, through the concrete correlation who prescribes a limit to the technological parameter of disc shearing and first steel thickness, because the influence of side clearance value to the steel limit portion quality of cutting is bigger than the influence of shear blade overlap degree, side clearance value and shear blade overlap degree also have the requirement to the steel grade simultaneously, consequently under the unanimous condition of steel grade, need adjust and design according to the thickness of first steel to the pressure size of control shearing realizes the control of the burr height of section of cutting.
As an optional implementation, the linear relationship is: when the thickness h of the first steel material 1 H is less than or equal to 0.3mm 1 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 1 +0.005；
When the thickness h of the first steel material 1 Satisfy 0.4mm < h 1 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 1 +0.005；
When the thickness h of the first steel material 1 Satisfy 1.4mm < h 1 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 1 +0.015；
When the thickness h of the first steel material 1 H is more than 2.6mm 1 When the thickness is less than or equal to 3.3mm, the lateral clearance value GAP =0.023.
In the present application, when the thickness h of the first steel material is 1 H is less than or equal to 0.3mm 1 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 1 The +0.005 positive effect is that a large number of experiments prove that when the material strength is low, the plasticity is good, the steel thickness is smaller, the selected gap is smaller, and in the thickness value range, the disc shearing is carried out by utilizing the lateral gap value obtained by calculating the corresponding formula, so that the shearing force generated by the disc shearing can be controlled to be optimal, and the burr height of a sheared burr area is reduced; when the thickness is less than the range of the thickness, the adverse effect is caused by too low thickness, shearThe cutting can not be normally carried out, the normal cutting can not be carried out in the existing process, when the thickness is larger than the value range of the thickness, the adverse effect caused by the fact that the thickness is too large is that the excessive thickness is no longer suitable for a corresponding lateral clearance value calculation formula, the cutting force is not in the optimal state, and the effect of reducing the burr height of a burr area of a cut surface can not be achieved.
When the thickness h of the first steel material 1 H is more than 0.4mm 1 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 1 The positive effect of +0.005 is that the lateral clearance value obtained by calculation of the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by the disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect is caused by that the shearing force is not in the optimal state because the thickness is too low and the too small thickness is not suitable for a corresponding lateral clearance value calculation formula any more, and the effect of reducing the burr height of a burr area of a cut surface cannot be achieved; when thickness is greater than the value range of this thickness, the adverse effect that will lead to is because thickness is too big, and too big thickness no longer suits the lateral clearance value computational formula that corresponds, leads to the dynamics of cuting to diminish, can't reduce the burr height in cut surface burr district.
When the thickness h of the first steel material is 1 Satisfies the condition that h is more than 1.4mm 1 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 1 The positive effect of +0.015 is that the lateral clearance value obtained by calculation of a corresponding formula is utilized to carry out disc shearing, and the shearing force generated by the disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect is caused by that the shearing force is not in the optimal state because the thickness is too low and the too small thickness is not suitable for a corresponding lateral clearance value calculation formula any more, and the effect of reducing the burr height of a burr area of a cut surface cannot be achieved; when thickness is greater than the value range of this thickness, the adverse effect that will lead to is because thickness is too big, and too big thickness no longer is fit for the lateral clearance value computational formula that corresponds, leads to the dynamics of cuting to diminish, can't reduce the burr height in cut surface burr district.
When the thickness h of the first steel material 1 H is more than 2.6mm 1 When the lateral clearance value is less than or equal to 3.3mm, the positive effect of GAP =0.023 is that the lateral clearance value obtained by calculating the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by the disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect is caused by that the shearing force is not in the optimal state because the thickness is too low and the too small thickness is not suitable for a corresponding lateral clearance value calculation formula any more, and the effect of reducing the burr height of a burr area of a cut surface cannot be achieved; when thickness is greater than the value range of this thickness, the adverse effect that will lead to is because thickness is too big, and too big thickness no longer is fit for the lateral clearance value computational formula that corresponds, leads to the dynamics of cuting to diminish, can't reduce the burr height in cut surface burr district.
As an optional implementation, the correlation relationship is: when the thickness h of the first steel material is 1 H is less than or equal to 0.3mm 1 When the thickness is less than or equal to 0.7mm, the overlapping degree LAP of the cutting edges is =0.43;
when the thickness h of the first steel material 1 H is more than 0.7mm 1 When the diameter is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 1 +0.11；
When the thickness h of the first steel material is 1 Satisfy 1.3mm < h 1 When the diameter is less than or equal to 2.8mm, the overlap degree LAP of the cutting edges is =0.164h 1 +0.976；
When the thickness h of the first steel material 1 Satisfy 2.8mm < h 1 When the thickness is less than or equal to 3.3mm, the overlap degree LAP of the cutting edges is =0.45.
In the present application, the thickness h of the first steel material 1 H is less than or equal to 0.3mm 1 When the thickness of the material is less than or equal to 0.7mm, the positive effect that the overlap degree LAP =0.43 of the shear blade is proved according to a large number of experiments that when the material strength is low, the plasticity is good, the thickness of the steel material is continuously increased, the overlap degree is selected to be increased and then decreased, the overlap degree of the shear blade obtained by calculation of a corresponding formula is utilized to carry out disc shearing, the shearing force generated by the disc shearing can be controlled to be optimal, and therefore the burr height of a sheared burr area is reduced; the thickness is too large, which will cause adverse effects due toThe thickness is too large, the too large thickness is no longer suitable for a corresponding shear blade overlap calculation formula, and when the value range of the thickness is too small, the adverse effect is caused by that the thickness is too low, the existing process cannot carry out normal shearing, and meanwhile, the shear blade overlap cannot be calculated.
When the thickness h of the first steel material 1 Satisfy 0.7mm < h 1 When the diameter is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 1 The positive effect of +0.11 is that the shearing edge overlapping degree calculated by the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; the value range of the thickness is too large or too small, the adverse effect to be caused is that the thickness of the thickness is not suitable for the corresponding shear blade overlapping degree calculation formula any more due to the too large or too small thickness, and the effect of reducing the burr height of the cutting surface burr area cannot be achieved.
When the thickness h of the first steel material is 1 Satisfies the condition that h is more than 1.3mm 1 When the length is less than or equal to 2.8mm, the overlap LAP of the cutting edge is =0.164h 1 The positive effect of +0.976 is that the shearing blade overlap degree obtained by calculation according to the corresponding formula is utilized to shear the disc, and the shearing force generated by disc shearing can be controlled to be optimal, so that the burr height of the sheared burr area is reduced; the value range of the thickness is too large or too small, the adverse effect to be caused is that the thickness of the thickness is not suitable for the corresponding shear blade overlapping degree calculation formula any more due to the too large or too small thickness, and the effect of reducing the burr height of the cutting surface burr area cannot be achieved.
When the thickness h of the first steel material 1 Satisfy 2.8mm < h 1 When the shearing force is less than or equal to 3.3mm, the shearing edge overlapping degree LAP =0.45 has the positive effects that the shearing force generated by disc shearing can be controlled to be optimal by performing disc shearing on the shearing edge overlapping degree obtained by calculating a corresponding formula, so that the burr height of a sheared burr area is reduced; the value range of the thickness is too large or too small, the adverse effect to be caused is that the thickness of the thickness is not suitable for the corresponding shear blade overlapping degree calculation formula any more due to the too large or too small thickness, and the effect of reducing the burr height of the cutting surface burr area cannot be achieved.
As an optional embodiment, as shown in fig. 1, before obtaining the process parameter of the disc shearing according to the thickness of the first steel material, the method further includes:
s31, galvanizing the first steel to obtain galvanized first steel.
As an optional implementation, the linear relationship is: thickness h of the first steel material after galvanization 2 H is less than or equal to 0.3mm 2 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 2 ；
Thickness h of the first steel material after galvanization 2 Satisfy 0.4mm < h 2 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 2 +0.01；
Thickness h of the first steel material after galvanization 2 Satisfies the condition that h is more than 1.4mm 2 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 2 +0.02；
Thickness h of the first steel material after galvanization 2 Satisfy 2.6mm < h 2 When the thickness is less than or equal to 3.3mm, the lateral clearance value GAP =0.023.
In the present application, the thickness h of the first steel material after galvanization 2 H is less than or equal to 0.3mm 2 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 2 The method has the advantages that a large number of experiments prove that when the material strength is low, the plasticity is good, the steel thickness is smaller, the selected gap is smaller, the lateral gap value calculated by using a corresponding formula is used for carrying out disc shearing in the thickness value range, and the shearing force generated by disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect to be caused is that the shearing cannot be normally carried out due to the fact that the thickness is too low, the existing process cannot normally shear, and when the thickness is larger than the value range of the thickness, the adverse effect to be caused is that the shearing force is not in the optimal state due to the fact that the thickness is too large and the too large thickness is no longer suitable for a corresponding lateral clearance value calculation formula, and the effect of reducing the burr height of a burr area of a cutting surface cannot be achieved.
Thickness h of the first steel material after galvanization 2 Satisfy 0.4mm < h 2 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 2 The positive effect of +0.01 is that the lateral clearance value obtained by calculation of the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by the disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect is caused by that the shearing force is not in the optimal state because the thickness is too low and the too small thickness is not suitable for a corresponding lateral clearance value calculation formula any more, and the effect of reducing the burr height of a burr area of a cut surface cannot be achieved; when thickness is greater than the value range of this thickness, the adverse effect that will lead to is because thickness is too big, and too big thickness no longer is fit for the lateral clearance value computational formula that corresponds, leads to the dynamics of cuting to diminish, can't reduce the burr height in cut surface burr district.
Thickness h of the first steel material after galvanization 2 Satisfy 2.6mm < h 2 When the thickness is less than or equal to 3.3mm, the side clearance value GAP =0.023 has the positive effects that the side clearance value obtained by the calculation of the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by the disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect is caused by that the shearing force is not in the optimal state because the thickness is too low and the too small thickness is not suitable for a corresponding lateral clearance value calculation formula any more, and the effect of reducing the burr height of a burr area of a cut surface cannot be achieved; when thickness is greater than the value range of this thickness, the adverse effect that will lead to is because thickness is too big, and too big thickness no longer suits the lateral clearance value computational formula that corresponds, leads to the dynamics of cuting to diminish, can't reduce the burr height in cut surface burr district.
Thickness h of the first steel material after galvanization 1 H is more than 2.6mm 2 When the thickness is less than or equal to 3.3mm, the side clearance value GAP =0.023 has the positive effects that the side clearance value obtained by the calculation of the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by the disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; when the thickness is smaller than the value range of the thickness, the adverse effect is caused because the thickness is too low, the too small thickness is not suitable for the corresponding calculation formula of the lateral clearance value,the shearing force is not in the optimal state, and the effect of reducing the burr height of the burr area of the cut surface cannot be achieved; when thickness is greater than the value range of this thickness, the adverse effect that will lead to is because thickness is too big, and too big thickness no longer is fit for the lateral clearance value computational formula that corresponds, leads to the dynamics of cuting to diminish, can't reduce the burr height in cut surface burr district.
As an optional implementation, the correlation relationship is: when the thickness h of the first steel material 2 H is less than or equal to 0.3mm 1 When the diameter is less than or equal to 0.7mm, the overlapping degree LAP of the cutting edges is =0.33;
when the thickness h of the first steel material 2 Satisfy 0.7mm < h 2 When the length is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 2 +0.1；
When the thickness h of the first steel material 2 Satisfy 1.3mm < h 2 When the diameter is less than or equal to 2.8mm, the overlap degree LAP of the cutting edges is =0.164h 2 +0.876；
When the thickness h of the first steel material 2 Satisfy 2.8mm < h 2 When the thickness is less than or equal to 3.3mm, the overlap degree LAP of the cutting edges is =0.4.
In the present application, the thickness h of the first steel material 2 H is less than or equal to 0.3mm 2 When the thickness of the material is less than or equal to 0.7mm, the positive effect that the overlap degree LAP =0.33 of the shear blade is proved according to a large number of experiments that when the material strength is low, the plasticity is good, the thickness of the steel material is continuously increased, the overlap degree is selected to be increased and then decreased, the overlap degree of the shear blade obtained by calculation of a corresponding formula is utilized to carry out disc shearing, the shearing force generated by the disc shearing can be controlled to be optimal, and therefore the burr height of a sheared burr area is reduced; the value range of the thickness is too large, the adverse effect caused by the excessive thickness is that the thickness is not suitable for a corresponding shear blade overlap calculation formula any more, and when the value range of the thickness is too small, the adverse effect caused by the too low thickness causes that the current process can not normally cut and the shear blade overlap can not be calculated.
When the thickness h of the first steel material 2 Satisfy 0.7mm < h 2 When the diameter is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 2 The positive effect of +0.1 is that the overlapping degree of the cutting edges is calculated by using a corresponding formulaThe disc shearing can control the shearing force generated by the disc shearing to be optimal, so that the burr height of a sheared burr area is reduced; the value range of this thickness is too big or the undersize, and the adverse effect that will lead to is because thickness is too big or the undersize, and the thickness of too big or the undersize no longer is fit for corresponding shear blade overlap degree computational formula, can't reach the effect that reduces cutting surface burr district burr height.
When the thickness h of the first steel material 2 Satisfy 1.3mm < h 2 When the diameter is less than or equal to 2.8mm, the overlap degree LAP of the cutting edges is =0.164h 2 The positive effect of +0.876 is that the shearing edge overlapping degree calculated by the corresponding formula is utilized to carry out disc shearing, and the shearing force generated by disc shearing can be controlled to be optimal, so that the burr height of a sheared burr area is reduced; the value range of the thickness is too large or too small, the adverse effect to be caused is that the thickness of the thickness is not suitable for the corresponding shear blade overlapping degree calculation formula any more due to the too large or too small thickness, and the effect of reducing the burr height of the cutting surface burr area cannot be achieved.
When the thickness h of the first steel material 2 Satisfy 2.8mm < h 2 When the shearing force is less than or equal to 3.3mm, the shearing edge overlapping degree LAP =0.4 has the positive effects that the shearing force generated by disc shearing can be controlled to be optimal by performing disc shearing on the shearing edge overlapping degree obtained by calculating a corresponding formula, so that the burr height of a sheared burr area is reduced; the value range of this thickness is too big or the undersize, and the adverse effect that will lead to is because thickness is too big or the undersize, and the thickness of too big or the undersize no longer is fit for corresponding shear blade overlap degree computational formula, can't reach the effect that reduces cutting surface burr district burr height.
As an alternative embodiment, the cut surface of the first steel material includes a crush zone, a cut zone, a tear zone, and a burr zone, and the area ratio of the crush zone, the cut zone, the tear zone, and the burr zone is: 3-10 percent, 60-80 percent, 30-40 percent and 0-1 percent.
In this application, the area proportion of the district that caves in, cuts off the district, tears the district and the burr district is: 0.03-0.01: 0.6-0.8: 0.3-0.4: 0-0.1 has the positive effects that the proportion of each area of the cut surface is controlled, and the burr height in the burr area can be controlled, so that the edge quality with better quality is obtained; when the value range of a certain area ratio is too large, the adverse effect to be caused is that the area ratio of other areas is reduced, the ratio of the burr area is increased, the height of the burr is increased, when the value range of the certain area ratio is too small, the adverse effect to be caused is that the area ratio of other areas is increased, the ratio of the burr area is also increased, and the height of the burr is increased.
As an optional embodiment, the ratio of the cutting area to the area of the cut surface is 0.6 to 0.8.
In this application, the cutting area accounts for the proportion of cutting surface area is 0.6 ~ 0.8's positive effect is under cold-rolled steel strip's limited steel grade condition, the proportion that the burr district can be controlled to the control cutting area proportion, thereby control the height in burr district, can obtain better side cut quality, it is too big when this proportion value range, the adverse effect that will lead to is the proportion increase in burr district, will lead to the burr height to increase, when the value range undersize of this proportion, the adverse effect that will lead to is the proportion increase in burr district, will lead to the burr height to increase.
As an alternative embodiment, the height of the burr region of the first steel material is 21 μm to 26 μm or 2 μm to 4 μm.
Example 1
As shown in fig. 1, a method for improving the quality of the cold-rolled strip steel edge cutting comprises the following steps:
s1, obtaining cold-rolled strip steel;
s2, continuously annealing the cold-rolled strip steel to obtain a first steel material;
s31, galvanizing the first steel to obtain galvanized first steel;
s3, obtaining technological parameters of disc shearing according to the thickness of the first steel;
s4, carrying out disc shearing on the first steel according to technological parameters to obtain cold-rolled strip steel with high trimming quality;
the process parameters comprise a lateral clearance value and a shear blade overlapping degree, the lateral clearance value and the thickness of the first steel material are in a positively correlated linear relationship, and the shear blade overlapping degree is in a first-increasing and then-decreasing correlation relationship along with the increase of the thickness of the first steel material.
The method specifically comprises the following steps: thickness h of the first steel material after galvanization 2 (iii) when =2.5mm, the side GAP value GAP =0.1b 2 +0.02=0.27, and the overlap of the cutting edges LAP =0.164h 2 +0.876＝1.286。
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 2
Comparing example 2 with example 1, example 2 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 (iii) when 0.3mm, the side GAP value GAP =0.1h 2 =0.003, the cutting edge overlap LAP =0.33.
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The proportion of the cut area to the area of the cut surface was 0.65.
Example 3
Comparing example 3 with example 1, example 3 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 (iii) when 0.4mm, the side GAP value GAP =0.1h 2 =0.004, and the degree of overlap of the cutting edges LAP =0.33.
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 4
Comparing example 4 with example 1, example 4 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 (iii) when 0.7mm, the side GAP value GAP =0.1h 2 +0.01=0.08, and the degree of overlap LAP of the cutting edges =0.33.
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The proportion of the cut area to the area of the cut surface was 0.65.
Example 5
Comparing example 5 with example 1, example 5 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 (ii) when =1.3mm, the lateral GAP value GAP =0.1h 2 +0.01=0.14, and the overlap of the cutting edges LAP =0.457h 2 +0.1＝0.6941。
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 6
Comparing example 6 with example 1, example 6 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 (iii) when =1.4mm, the side GAP value GAP =0.1h 2 +0.01=0.14, and the degree of overlap of the cutting edges LAP =0.164h 2 +0.876＝1.1056。
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 7
Comparing example 7 with example 1, example 7 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 (iii) when =2.6mm, the side GAP value GAP =0.1h 2 +0.02=0.28, and the degree of overlap of the cutting edges LAP =0.164h 2 +0.876＝1.3024。
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 8
Comparing example 8 with example 1, example 8 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 =2.8mm, the side clearance GAP =0.023, and the cutting edge overlap LAP =0.164h 2 +0.876＝1.3352。
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.03: 0.6: 0.35: 0.001.
The proportion of the cut area to the area of the cut surface was 0.6.
Example 9
Comparing example 9 with example 1, example 9 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 =3.3mm, the side GAP value GAP =0.023, and the cutting edge overlap LAP =0.4.
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.1: 0.8: 0.4: 0.02.
The ratio of the cut area to the cut surface area was 0.8.
Example 10
Comparing example 10 with example 1, example 10 differs from example 1 in that:
as shown in fig. 2, a method for improving the quality of cold-rolled steel strip edge cutting comprises the following steps:
s1, obtaining cold-rolled strip steel;
s2, continuously annealing the cold-rolled strip steel to obtain a first steel material;
s3, obtaining technological parameters of disc shearing according to the thickness of the first steel;
s4, carrying out disc shearing on the first steel according to the technological parameters to obtain cold-rolled strip steel with high trimming quality;
the process parameters comprise a lateral clearance value and a shear blade overlapping degree, the lateral clearance value and the thickness of the first steel material are in a positively correlated linear relationship, and the shear blade overlapping degree is in a first-increasing and then-decreasing correlation relationship along with the increase of the thickness of the first steel material.
When the thickness h of the first steel material 1 (iii) when =2mm, the side GAP value GAP =0.1h 1 +0.015=0.215, and the degree of overlap of the cutting edges LAP =0.164h 1 +0.976＝1.304；
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 11
Comparing example 11 with example 10, example 11 differs from example 10 in that:
when the thickness h of the first steel material 1 (ii) when =0.3mm, the lateral GAP value GAP =0.1h 1 +0.005=0.008, shear edge overlap LAP =0.43;
the cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The proportion of the cut area to the area of the cut surface was 0.65.
Example 12
Comparing example 12 with example 10, example 12 differs from example 10 in that:
when the thickness h of the first steel material 1 (iii) when 0.4mm, the side GAP value GAP =0.1h 1 +0.005=0.009, and the shear edge overlap LAP =0.43;
the cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The proportion of the cut area to the area of the cut surface was 0.65.
Example 13
Comparing example 13 with example 10, example 13 differs from example 10 in that:
when the thickness h of the first steel material 1 (iii) when 0.7mm, the side GAP value GAP =0.1h 1 +0.005=0.075, the cutting edge overlap LAP =0.43;
the cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 14
Comparing example 14 with example 10, example 14 differs from example 10 in that:
when the thickness h of the first steel material 1 (iii) when =1.3mm, the side GAP value GAP =0.1h 1 +0.005=0.135, and the overlap of the cutting edges LAP =0.457h 1 +0.11＝0.7041；
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 15
Comparing example 15 with example 10, example 15 differs from example 10 in that:
when the thickness h of the first steel material 1 (iii) when =1.4mm, the side GAP value GAP =0.1h 1 +0.005=0.145, and the degree of overlap LAP of the cutting edges =0.164h 1 +0.976＝1.2056；
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 16
Comparing example 16 with example 10, example 16 differs from example 10 in that:
when the thickness h of the first steel material 1 (iii) when =2.6mm, the side GAP value GAP =0.1h 1 +0.015=0.275, and the degree of overlap of the cutting edges LAP =0.164h 1 +0.976＝1.4024；
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.04: 0.65: 0.3: 0.01.
The ratio of the cut area to the cut surface area was 0.65.
Example 17
Comparing example 17 with example 10, example 17 differs from example 10 in that:
when the thickness h of the first steel material 1 =2.8mm, the side GAP value GAP =0.023, and the cutting edge overlap LAP =0.164h 1 +0.976＝1.4352；
The cutting surface of the first steel material comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.03: 0.6: 0.35: 0.001.
The ratio of the cut area to the cut surface area was 0.6.
Example 18
Comparing example 18 with example 10, example 18 differs from example 10 in that:
when the thickness h of the first steel material 1 -a lateral clearance value GAP =0.023 and a cutting edge overlap LAP =0.45 for =3.3 mm;
the cutting surface of the first steel comprises a pressing area, a cutting area, a tearing area and a burr area, and the area ratio of the pressing area to the cutting area to the tearing area to the burr area is 0.1: 0.8: 0.4: 0.02.
The ratio of the cut area to the cut surface area was 0.8.
Comparative example 1
Comparative example 1 is compared to example 1, the difference between comparative example 1 and example 1 being:
the lateral clearance value GAP =0.27 and the cutting edge overlapping degree LAP =1.286 of the first steel after galvanization indicate that the adopted lateral clearance value and the adopted cutting edge overlapping degree are fixed values, namely, the technological parameters of the original process are adopted.
Comparative example 2
Comparative example 2 is compared to example 10, the difference between comparative example 2 and example 10 being:
the lateral clearance GAP = GAP =0.215 and the cutting edge overlap ratio LAP =1.304 of the first steel, which means that the adopted lateral clearance value and the adopted cutting edge overlap ratio are fixed values, namely, the process parameters of the original process are adopted.
Comparative example 3
Comparative example 3 is compared with example 10, and comparative example 3 differs from example 10 in that:
when the thickness h of the first steel material 1 =0.2mm, and the thickness of the steel material is too low, so that the disc shear cannot cut.
Comparative example 4
Comparative example 4 is compared to example 1, and comparative example 4 differs from example 1 in that:
thickness h of the first steel material after galvanization 2 When the diameter is not less than 0.2mm, the disc shear cannot shear the workpiece.
Correlation experiments
The first steel materials after the disk shearing in examples 1 to 11 and comparative examples 1 to 5 and the first steel materials after the galvanization were collected and uniformly treated not with the burring roller for the first steel materials but with the burring roller for the first steel materials after the galvanization, and the burring heights of the first steel materials and the first steel materials after the galvanization were respectively counted, and the results are shown in table 1.
Correlation test method
The burr height testing method comprises the following steps: after the strip steel edge samples were obtained, the measurement was performed using a pockmark apparatus.
TABLE 1
Specific analysis of table 1:
the burr height refers to the height of the tiny burr in the burr area that produces after the side cut, and when this burr height is lower, it indicates that the trimming quality that the circle shear sheared is better.
From the data in examples 1-11, it can be seen that:
when the calculation formula of the lateral clearance value and the shear blade overlapping degree corresponding to the first steel and the galvanized first steel is adopted, the lateral clearance value and the shear blade overlapping degree are determined according to the thickness of the steel, the burr height of the first steel obtained through continuous annealing and the galvanized first steel obtained through galvanizing treatment can be obviously reduced, and the trimming quality is improved.
From the data of comparative examples 1 to 4:
when the first steel material obtained through continuous annealing treatment and the first steel material obtained through galvanizing treatment are set by fixed values in the prior art, the first steel material obtained through continuous annealing treatment and the first steel material obtained through galvanizing treatment are respectively subjected to disc shearing, and the burr height of the obtained product is three times or more higher than that of the product obtained through the method.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
(1) The method provided by the embodiment of the application can be used for carrying out composite treatment on the continuous annealing product and the galvanized product, also can be used for respectively treating the continuous annealing product and the galvanized product, and can be used for switching different treatment modes according to the requirements of customers, so that the energy consumption is saved.
(2) According to the method provided by the embodiment of the application, the relation between the lateral clearance value and the steel thickness is limited, and then the relation between the shearing edge overlapping degree and the steel thickness is limited, so that the lateral clearance value and the shearing edge overlapping degree of disc shearing are adjusted according to the steel thickness, the pressure and the action time of disc shearing are adjusted, the first steel with the burr height of 21-26 mu m and the galvanized first steel with the burr height of 2-4 mu m can be obtained, and the burr height of a burr area is fully reduced.
(3) According to the method provided by the embodiment of the application, the steel thickness of the cold-rolled strip steel can be identified through a sensor or a related system, so that the side clearance value and the shearing edge overlapping degree of disc shearing are calculated and controlled through a set formula, the technological parameters of disc shearing are controlled through the steel thickness, the technological parameters can be integrated on an automatic production line of the cold-rolled steel, automatic production is realized, and the trimming quality is further improved.
The drawings illustrate:
FIG. 4 is a schematic diagram of the edge burr appearance of the first steel material in the method for improving the quality of the cold-rolled strip steel edge trim according to comparative example 2;
FIG. 5 is a schematic diagram of the edge burr profile of the first steel material according to the method for improving the quality of the cold-rolled strip steel edge trim provided in embodiment 10 of the present application;
as is apparent from FIGS. 4 and 5, when the continuously annealed first steel material obtained by the method of comparative example 1 was not subjected to the burring roll treatment, the burr height was 84 μm to 89 μm, whereas the burr height obtained by the method of example 10 of the present application was 21 μm to 26 μm, the burr height was remarkably reduced.
FIG. 6 is a schematic diagram of the appearance of burrs at the edge of a first galvanized steel material according to the method for improving the quality of the cut edge of the cold-rolled strip steel provided by comparative example 1 of the application;
FIG. 7 is a schematic diagram of the edge burr appearance of the first steel material after galvanization in the method for improving the quality of the cold-rolled strip edge trim according to embodiment 11 of the present application;
as is apparent from FIGS. 6 and 7, when the first galvanized steel material obtained by the method of comparative example 2 was subjected to the burring roll treatment, the burr height was 9 μm to 14 μm, while the first galvanized steel material obtained by the method of example 1 of the present application had a burr height of 2 μm to 4 μm.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The method for improving the trimming quality of the cold-rolled steel strip is characterized by comprising the following steps:
obtaining cold-rolled strip steel;
continuously annealing the cold-rolled strip steel to obtain a first steel;
according to the thickness of the first steel, obtaining the technological parameters of disc shearing;
carrying out disc shearing on the first steel according to the process parameters to obtain cold-rolled strip steel with high trimming quality;
the process parameters comprise a lateral clearance value and a shear blade overlap degree, the lateral clearance value and the thickness of the first steel material are in a positively correlated linear relationship, and the shear blade overlap degree is in a first-increasing and then-decreasing correlation relationship along with the increase of the thickness of the first steel material.
2. The method of claim 1, wherein the linear relationship is: when the thickness h of the first steel material is 1 H is less than or equal to 0.3mm 1 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 1 +0.005；
When the thickness h of the first steel material 1 Satisfy 0.4mm < h 1 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 1 +0.005；
When the thickness h of the first steel material 1 Satisfy 1.4mm < h 1 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 1 +0.015；
When the thickness h of the first steel material 1 Satisfy 2.6mm < h 1 When the thickness is less than or equal to 3.3mm, the lateral clearance value GAP =0.023.
3. The method of claim 1, wherein the correlation relationship is: when the thickness h of the first steel material 1 H is less than or equal to 0.3mm 1 When the diameter is less than or equal to 0.7mm, the overlap LAP of the shearing edge is =0.43;
when the thickness h of the first steel material is 1 Satisfy 0.7mm < h 1 When the diameter is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 1 +0.11；
When the thickness h of the first steel material is 1 Satisfy 1.3mm < h 1 When the diameter is less than or equal to 2.8mm, the overlap degree LAP of the cutting edges is =0.164h 1 +0.976；
When the thickness h of the first steel material 1 Satisfy 2.8mm < h 1 When the thickness is less than or equal to 3.3mm, the overlap degree LAP of the cutting edges is =0.45.
4. The method of claim 1, wherein obtaining the process parameters for disc shearing based on the thickness of the first steel material further comprises:
and galvanizing the first steel to obtain galvanized first steel.
5. The method of claim 4, wherein the linear relationship is: thickness h of the first steel material after galvanization 2 H is less than or equal to 0.3mm 2 When the thickness is less than or equal to 0.4mm, the lateral clearance value GAP =0.1h 2 ；
Thickness h of the first steel material after galvanization 2 H is more than 0.4mm 2 When the thickness is less than or equal to 1.4mm, the lateral clearance value GAP =0.1h 2 +0.01；
Thickness h of the first steel material after galvanization 2 Satisfies the condition that h is more than 1.4mm 2 When the thickness is less than or equal to 2.6mm, the lateral clearance value GAP =0.1h 2 +0.02；
Thickness h of the first steel material after galvanization 2 Satisfy 2.6mm < h 2 When the thickness is less than or equal to 3.3mm, the lateral clearance value GAP =0.023.
6. The method of claim 4, wherein the correlation relationship is: thickness h of the first steel material after galvanization 2 H is less than or equal to 0.3mm 2 When the diameter is less than or equal to 0.7mm, the overlapping degree LAP of the cutting edges is =0.33;
thickness h of the first steel material after galvanization 2 H is more than 0.7mm 2 When the length is less than or equal to 1.3mm, the overlap degree of the cutting edges LAP =0.457h 2 +0.1；
Thickness h of the first steel material after galvanization 2 Satisfy 1.3mm < h 2 When the diameter is less than or equal to 2.8mm, the overlap degree LAP of the cutting edges is =0.164h 2 +0.876；
Thickness h of the first steel material after galvanization 2 H is more than 2.8mm 2 When the thickness is less than or equal to 3.3mm, the overlap degree LAP of the cutting edges is =0.4.
7. The method according to claim 1 or 4, wherein the cut surface of the first steel material includes a crushed area, a cut area, a torn area, and a burred area, and the area ratio of the crushed area, the cut area, the torn area, and the burred area is 0.03-0.01: 0.6-0.8: 0.3-0.4: 0-0.1.
8. The method according to claim 7, wherein the ratio of the area of the cut area to the cut surface is 0.6 to 0.8.
9. The method according to claim 7, wherein the burr region height of the cut surface is 21 to 26 μm or 2 to 4 μm.
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