Method for precise cutting of long billets

Abstract

The present application belongs to the field of long billet cutting in steelmaking, and relates to a method for accurately cutting the size of long billet in steelmaking. The method comprises the following steps: installing a thickness measuring device and a width measuring device before cutting the billet in steelmaking; comparing the measured thickness and width with the size of the billet after the width and thickness are reduced by 1.013, so as to set a method for accurately cutting the size of long billet in steelmaking, reduce the generation of off-plan residual billets, effectively improve the yield and reduce the proportion of spot goods, and also reduce the labor intensity of the group plate personnel.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking long billet cutting, and relates to a method for accurately cutting steelmaking long billets to the correct dimensions. Background Technology

[0002] Due to factors such as steelmaking speed and continuous casting of different steel grades, the size control of long steel billets fluctuates significantly. Almost 6% of the billets are out of contract each month due to size abnormalities. These out-of-contract billets need to be reused by the plate assembly personnel. Since the length of the billets has been determined according to the initial design length, there are situations where the maximum plate assembly cannot be achieved or products are produced together when reused. The optimal size design cannot be carried out, which affects the yield and the proportion of spot products. It also increases the labor intensity of the plate assembly personnel. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for accurately cutting long steel billets to the required dimensions, thereby solving the existing problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for accurately cutting long steel billets to the required dimensions, comprising the following steps:

[0005] S1. Before cutting the steel billet, the steelmaking process installs a thickness and width measuring device. The heat release coefficient of the steel billet is 1.013. The measured thickness and width dimensions are compared with the dimensions obtained by multiplying the lower limit of the billet's thickness and width by 1.013.

[0006] S11, if the measured thickness is greater than or equal to the lower limit of the billet thickness * 1.013 and the measured width is greater than or equal to the lower limit of the billet width * 1.013, then cut according to the original planned length;

[0007] S12, if the measured thickness is greater than or equal to the lower limit of the billet thickness * 1.013 and the measured width is less than the lower limit of the billet width * 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length; according to the principle of equal volume, that is, the length of the long ruler = the planned thickness of the billet * the planned width of the billet * the planned length of the billet / the planned thickness of the billet / the actual measured width;

[0008] S1201, if the calculated length of the long ruler is less than or equal to the planned length, then cut according to the planned length, and the two-cut plan contained within the long ruler remains unchanged;

[0009] S1202, if the calculated length of the long ruler is greater than the planned length, then cut according to the calculated length, and calculate the length of the second cut billet according to the second cut formula; then transmit the actual size of the long ruler to the steel rolling mill, and replace the original cutting plan with the recalculated second cut length in the actual size, and transmit the replaced information to the steel rolling mill.

[0010] S13. If the measured thickness is less than the lower limit of the billet thickness * 1.013 and the measured width is greater than or equal to the lower limit of the billet width * 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length. According to the principle of equal volume, the length of the long ruler = the planned thickness of the billet * the planned width of the billet * the planned length of the billet / the actual measured thickness of the billet / the planned width of the billet.

[0011] S1301, if the calculated length of the long ruler is less than or equal to the planned length, then cut according to the planned length, and the two-cut plan contained within the long ruler remains unchanged;

[0012] S1302, if the calculated length of the long ruler is greater than the planned length, then cut according to the calculated length, and calculate the length of the second cut billet according to the second cut formula; then transmit the actual size of the long ruler to the steel rolling mill, and replace the original cutting plan with the recalculated second cut length in the actual size, and transmit the replaced information to the steel rolling mill.

[0013] S14. If the measured thickness is less than the lower limit of billet thickness * 1.013 and the measured width is less than the lower limit of billet width * 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length. Based on the principle of equal volume, that is, the length of the long ruler = the planned thickness of the billet * the planned width of the billet * the planned length of the billet / the actual measured thickness of the billet / the actual measured width of the billet, the length of the second cut billet is calculated according to the second cut formula. Then the actual dimensions of the long ruler are transmitted to the steel rolling mill, and the recalculated second cut length in the actual dimensions is used to replace the original cutting plan. The replaced information is then transmitted to the steel rolling mill.

[0014] Optionally, the formula for calculating the length of the two cuts is as follows:

[0015] The beneficial effects of this invention are: it reduces the generation of unfinished blanks, effectively improves the yield and reduces the proportion of spot goods, and also reduces the labor intensity of assembly personnel.

[0016] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Detailed Implementation

[0017] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0018] The present invention provides a method for accurately cutting long steel billets to the required dimensions, comprising the following steps:

[0019] S1. Before cutting the steel billet, the steelmaking process installs a thickness and width measuring device. The heat release coefficient of the steel billet is 1.013. The measured thickness and width dimensions are compared with the dimensions obtained by multiplying the lower limit of the billet's thickness and width by 1.013.

[0020] S11, if the measured thickness is greater than or equal to the lower limit of the billet thickness * 1.013 and the measured width is greater than or equal to the lower limit of the billet width * 1.013, then cut according to the original planned length;

[0021] S12, if the measured thickness is greater than or equal to the lower limit of the billet thickness * 1.013 and the measured width is less than the lower limit of the billet width * 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length; according to the principle of equal volume, that is, the length of the long ruler = the planned thickness of the billet * the planned width of the billet * the planned length of the billet / the planned thickness of the billet / the actual measured width;

[0022] S1201, if the calculated length of the long ruler is less than or equal to the planned length, then cut according to the planned length, and the two-cut plan contained within the long ruler remains unchanged;

[0023] S1202, if the calculated length of the long ruler is greater than the planned length, then cut according to the calculated length, and calculate the length of the second cut billet according to the second cut formula; then transmit the actual size of the long ruler to the steel rolling mill, and replace the original cutting plan with the recalculated second cut length in the actual size, and transmit the replaced information to the steel rolling mill.

[0024] S13. If the measured thickness is less than the lower limit of the billet thickness * 1.013 and the measured width is greater than or equal to the lower limit of the billet width * 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length. According to the principle of equal volume, the length of the long ruler = the planned thickness of the billet * the planned width of the billet * the planned length of the billet / the actual measured thickness of the billet / the planned width of the billet.

[0025] S1301, if the calculated length of the long ruler is less than or equal to the planned length, then cut according to the planned length, and the two-cut plan contained within the long ruler remains unchanged;

[0026] S1302, if the calculated length of the long ruler is greater than the planned length, then cut according to the calculated length, and calculate the length of the second cut billet according to the second cut formula; then transmit the actual size of the long ruler to the steel rolling mill, and replace the original cutting plan with the recalculated second cut length in the actual size, and transmit the replaced information to the steel rolling mill.

[0027] S14. If the measured thickness is less than the lower limit of billet thickness * 1.013 and the measured width is less than the lower limit of billet width * 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length. Based on the principle of equal volume, that is, the length of the long ruler = the planned thickness of the billet * the planned width of the billet * the planned length of the billet / the actual measured thickness of the billet / the actual measured width of the billet, the length of the second cut billet is calculated according to the second cut formula. Then the actual dimensions of the long ruler are transmitted to the steel rolling mill, and the recalculated second cut length in the actual dimensions is used to replace the original cutting plan. The replaced information is then transmitted to the steel rolling mill.

[0028] In this embodiment, the formula for calculating the length of the two cuts is as follows: Specific Implementation

[0030] Assuming the billet's hot-state planned thickness is 233mm, width is 2087mm, and the total cutting length is 7600mm, if the measured thickness is ≥229mm and the width is ≥2077mm, then the total cutting length is 7600mm. If the measured thickness is 228mm and the width is 2078mm, the calculation shows 228*2078*7600 < 233*2087*7600, so the cutting is done according to the plan. If the measured thickness is 233mm and the width is 2090mm, the calculation shows 233*2090*7600 > 233*2087*7600, so the cutting dimensions are calculated based on equal volume: 233*2087*7600 / 233 / 2090. The second cutting length is then calculated based on the actual measured thickness of 233mm and the actual measured width of 2090mm, and this second cutting length is used to replace the original cutting plan.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for accurately cutting long steel billets to the correct dimensions, characterized in that, Includes the following steps: S1. Before cutting the steel billet, install a thickness and width measuring device. The heat release coefficient of the steel billet is 1.

013. The measured thickness and width dimensions are compared with the dimensions obtained by multiplying the lower limit of the billet width and thickness by 1.

013. S11, if the measured thickness is greater than or equal to the lower limit of the billet thickness × 1.013 and the measured width is greater than or equal to the lower limit of the billet width × 1.013, then cut according to the original planned length; S12, if the measured thickness is greater than or equal to the lower limit of the billet thickness × 1.013 and the measured width is less than the lower limit of the billet width × 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length; according to the principle of equal volume, that is, the length of the long ruler = the planned thickness of the billet × the planned width of the billet × the planned length of the billet / the planned thickness of the billet / the actual measured width. S1201, if the calculated length of the long ruler is less than or equal to the planned length, then cut according to the planned length, and the two-cut plan contained within the long ruler remains unchanged; S1202, if the calculated length of the long ruler is greater than the planned length, then cut according to the calculated length, and calculate the length of the second cut billet according to the second cut formula; then transmit the actual size of the long ruler to the steel rolling mill, and replace the original cutting plan with the recalculated second cut length in the actual size, and transmit the replaced information to the steel rolling mill. S13. If the measured thickness is less than the lower limit of the billet thickness × 1.013 and the measured width is greater than or equal to the lower limit of the billet width × 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length. According to the principle of equal volume, the length of the long ruler = the planned thickness of the billet × the planned width of the billet × the planned length of the billet / the actual measured thickness of the billet / the planned width of the billet. S1301, if the calculated length of the long ruler is less than or equal to the planned length, then cut according to the planned length, and the two-cut plan contained within the long ruler remains unchanged; S1302, if the calculated length of the long ruler is greater than the planned length, then cut according to the calculated length, and calculate the length of the second cut billet according to the second cut formula; then transmit the actual size of the long ruler to the steel rolling mill, and replace the original cutting plan with the recalculated second cut length in the actual size, and transmit the replaced information to the steel rolling mill. S14. If the measured thickness is less than the lower limit of the billet thickness × 1.013 and the measured width is less than the lower limit of the billet width × 1.013, the cutting length needs to be recalculated and the cutting should be carried out according to the recalculated length. According to the principle of equal volume, that is, the length of the long ruler = the planned thickness of the billet × the planned width of the billet × the planned length of the billet / the actual measured thickness of the billet / the actual measured width of the billet, the length of the second cut billet is calculated according to the second cut formula. Then the actual dimensions of the long ruler are transmitted to the steel rolling mill, and the recalculated second cutting length in the actual dimensions is used to replace the original cutting plan. The replaced information is then transmitted to the steel rolling mill.