TWI770536B - Method and system for identifying causes of hot-rolled product defects - Google Patents

Abstract

A method and a system for identifying causes of hot-rolled product defects are provided. The method for identifying causes of hot-rolled product defects includes: determining an unqualified mechanical property of a problematic hot-rolled product; analyzing a normal level of mechanical properties of a plurality of qualified hot-rolled products, and comparing the unqualified mechanical property with the normal level of mechanical properties; analyzing a normal level of component of the qualified hot-rolled products, and comparing a component data of the problematic hot-rolled product with the normal level of component; and analyzing and comparing a plurality of process parameters of the problematic hot-rolled product with the process parameters of the qualified hot-rolled products.

Description

Method and system for judging causes of defects in hot-rolled products

The present invention relates to a method and system for judging the causes of defects, in particular to a method and system for judging the causes of defects in hot-rolled products.

In the current production line operation of hot-rolled products, because of the large number of customers and the variety of hot-rolled products, even the needs and quality control requirements of each order of the same customer are different. In the current operation, three separate computer systems are often used to collect data to facilitate the management of many data. For example, the main computer is used to collect basic order information such as steel grade, coil number, and billet number, and the process computer is used to manage Process parameters and collect parameter changes during the process and use quality control computers to collect various quality control data (such as mechanical properties of hot-rolled products, composition data, etc.).

Because of this, once the mechanical properties of the hot-rolled product are questioned, for example, it is necessary to go to the main computer to find out the coil number or billet number of the hot-rolled product, and then use the coil number or billet number to check the quality control computer. The mechanical properties and composition data of the hot-rolled product are obtained, and the process parameters of the hot-rolled product are found out by the coil number or the billet number. Analysts need to spend time separately collecting the steel billet, mechanical properties, composition data, process parameters and other data of the hot-rolled product, and then interpret the above data based on personal experience to estimate the cause of this defect. Moreover, such experience accumulation is only applicable to a single product, and such experience cannot be accumulated effectively and systematically. For example, the experience of hot-rolled products of specification A may not be applied to the defect interpretation of hot-rolled products of specification B.

In addition, the existing technology requires a specific coil number or steel billet number in order to find out the relevant mechanical properties, composition data, and process parameters. Therefore, in the absence of the relevant steel coil number or billet number, the existing technology It is not possible to analyze the hot-rolled products of the same equipment (for example, the same furnace) at different time points, and thus cannot conduct a comprehensive analysis of the causes of hot-rolled product defects.

Therefore, it is necessary to provide a method and system for judging the causes of defects in hot-rolled products, so as to solve the problems existing in the conventional technology.

The purpose of the present invention is to provide a method and system for judging the causes of defects in hot-rolled products, so as to shorten the time for judging the causes of defects in hot-rolled products. In addition, the present invention can comprehensively analyze the data of similar hot-rolled products to determine the cause of the defect, and then establish the process parameter control logic. Finally, the same defects can be avoided for similar hot rolled products in the future through process parameter control logic.

In order to achieve the above objects, the present invention provides a method for judging the causes of defects in hot-rolled products, comprising: confirming an unqualified mechanical property in a problematic hot-rolled product; analyzing a normal level of a mechanical property of a plurality of qualified hot-rolled products, and comparing The unqualified mechanical properties and the normal level of the mechanical properties; analyze the normal level of a component of the qualified hot-rolled products, and compare a component data of the hot-rolled product in question with the normal level of the component; and analyze and compare the normal level of the component Problem hot rolled products and various process parameters of those qualified hot rolled products.

In an embodiment of the present invention, analyzing the normal level of the mechanical properties of the qualified hot-rolled products, and comparing the unqualified mechanical properties with the normal level of the mechanical properties, includes: analyzing the hot-rolled products produced by producing the problem. The mechanical properties of the qualified hot-rolled products produced by a facility at different times, and produce normal levels of the mechanical properties.

In an embodiment of the present invention, analyzing the normal level of mechanical properties of the qualified hot-rolled products, and comparing the unqualified mechanical properties with the normal level of mechanical properties, includes: analyzing the same steel grade as the hot-rolled product in question and The mechanical properties of the qualified hot rolled products of the same thickness and yield the normal level of the mechanical properties.

In an embodiment of the present invention, analyzing the component normal level of the qualified hot-rolled products, and comparing the component data of the problem hot-rolled product with the component normal level, includes: analyzing the problem hot-rolled product by producing the problem hot-rolled product. The composition data of the qualified hot-rolled products produced by an equipment of the product at different times, and the normal level of the composition is generated.

In an embodiment of the present invention, analyzing the normal level of the component of the qualified hot-rolled products, and comparing the component data of the hot-rolled product in question with the normal level of the component, including: analyzing the same as the hot-rolled product in question The composition data of the qualified hot-rolled products of the steel grade and the same thickness, and produce the normal level of the composition.

In an embodiment of the present invention, analyzing and comparing the process parameters of the problem hot-rolled product and the qualified hot-rolled products includes: analyzing the production of the problem hot-rolled product at different times by a device that produces the problem hot-rolled product The process parameters of the qualified hot-rolled products are obtained, and a normal level of process parameters is generated.

In an embodiment of the present invention, analyzing and comparing the process parameters of the problem hot-rolled product and the qualified hot-rolled products includes: analyzing the qualified hot-rolled products of the same steel grade and the same thickness as the problem hot-rolled product The process parameters of the product are rolled and a process parameter normal level is generated.

In an embodiment of the present invention, the method for judging the cause of a defect of a hot-rolled product further includes: establishing a process parameter control logic, and comparing a plurality of control process parameters in the process parameter control logic with the problem hot-rolled product. these process parameters.

The present invention also provides a system for judging the causes of rolled product defects, comprising: a data collection module configured to collect a plurality of hot-rolled product data; a database configured to store the data collected from the data collection module some hot-rolled product data, wherein the hot-rolled product data includes a plurality of mechanical properties, a plurality of composition data, and a plurality of process parameters; and a processing module configured to access the hot-rolled products in the database data, to perform: confirm an unqualified mechanical property in a hot-rolled product in question; analyze a normal level of mechanical properties of a plurality of qualified hot-rolled products, and compare the unqualified mechanical property with the normal level of the mechanical property; analyze the A component normal level of some qualified hot-rolled products is compared, and a component data of the problem hot-rolled product is compared with the component normal level; and the process parameters of the problem hot-rolled product and the qualified hot-rolled products are analyzed and compared.

In an embodiment of the present invention, the processing module has a process parameter control logic, and the processing module compares a plurality of control process parameters in the process parameter control logic with the process parameters of the hot-rolled product in question.

As mentioned above, the method and system for judging the causes of defects in hot-rolled products provided by the present invention actively collect the mechanical properties, composition data and process parameters of hot-rolled products in question and qualified hot-rolled products, thereby shortening the judgment of causes of defects in hot-rolled products. time. By analyzing and comparing the difference between the normal level of mechanical properties, the normal level of composition and the normal level of process parameters between the hot-rolled product in question and the qualified hot-rolled product, the cause of the defect of the hot-rolled product can be judged more comprehensively.

In order to make the above-mentioned and other objects, features and advantages of the present invention more clearly understood, the preferred embodiments of the present invention will be exemplified below and described in detail in conjunction with the accompanying drawings. Furthermore, the directional terms mentioned in the present invention, such as up, down, top, bottom, front, rear, left, right, inner, outer, side, surrounding, center, horizontal, lateral, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., are only directions with reference to the attached drawings. Therefore, the directional terms used are for describing and understanding the present invention, not for limiting the present invention.

Please refer to FIG. 1 to FIG. 9. FIG. 1 is a schematic diagram of a system for judging the causes of defects in hot-rolled products according to an embodiment of the present invention. FIG. 2 is a one-step flow chart of a method for judging the causes of defects in a hot-rolled product according to an embodiment of the present invention. FIG. 3 is a schematic diagram of step S220 in an example of applying the embodiment of the present invention. FIG. 4 is a schematic diagram of step S230 in the example of FIG. 3 . FIG. 5 is another schematic diagram of step S230 in this example of FIG. 3 . FIG. 6 is a schematic diagram of step S240 in the example of FIG. 3 . FIG. 7 is a schematic diagram of step S250 in the example of FIG. 3 . FIG. 8 is a schematic diagram of the determination result of the cause of the defect of the hot-rolled product in the example of FIG. 3 . FIG. 9 is a schematic diagram of a process parameter control logic in an embodiment of the present invention.

As shown in FIG. 1 , a system 100 for determining the causes of defects in hot rolled products according to an embodiment of the present invention includes: a data collection module 110 , a database 120 and a processing module 130 . The data collection module 130 is configured to collect a plurality of hot rolled product data. The data collection module 110 includes a basic data collection computer 110a, a quality control data collection computer 110b, and a process parameter collection computer 110c. The basic data collection computer 110a is configured to collect basic order data such as steel grades, coil numbers, and billet numbers of hot-rolled products. The quality control data collection computer 110b is configured to collect mechanical properties and composition data of hot rolled products. The process parameter collection computer 110c is configured to collect process parameters of the hot rolled product.

The database 120 is configured to store the hot rolled product data from the data collection module 110, wherein the hot rolled product data includes a plurality of mechanical properties, a plurality of composition data and a plurality of process parameters. These organic properties can include yield strength (YS), tensile strength (TS), elongation (EL), and these component materials can include carbon (C), manganese (Mn), phosphorus (P), sulfur (S) ), silicon (Si) and other elements, these process parameters can include finish rolling temperature (FT), coil temperature (CT) and so on.

The processing module 130 is configured to access the hot-rolled product data in the database 120 so as to execute a method for judging the cause of a hot-rolled product defect, as shown in FIG. 2 . In addition, the processing module 130 has a process parameter control logic 135 .

As in the embodiment of FIG. 2, the method 200 for determining the causes of defects in the hot-rolled product includes the following steps:

Step S210, input a coil number of a hot-rolled product in question. It should be understood that each hot rolled product has a corresponding coil number. The hot-rolled product in question refers to a hot-rolled product that does not meet a specified value/specified range of mechanical property items or components. It should be understood that the specification/range may be from the customer, and the specification/range may be of any customer concern and is not limited to mechanical properties or composition only.

Step S220, confirming an unqualified mechanical property in a problem hot-rolled product. The unqualified mechanical property means that the mechanical property item does not meet a specified value/specified range. It should be understood that this specified value/specified range may be derived from customer requirements and may vary depending on the application of the hot rolled product in question. That is, this specified value/specified range may vary by customer or application.

Step S230, analyzing a normal level of mechanical properties of a plurality of qualified hot-rolled products, and comparing the unqualified mechanical properties with the normal level of mechanical properties. The normal level of mechanical properties may include the average value and standard deviation of the mechanical property items, such as the mean value of yield strength (YS(AVG)) and the standard deviation of yield strength (YS(STD)) and the like. Step S230 may include: analyzing the mechanical properties of the qualified hot-rolled products produced at different times by a device that produces the problematic hot-rolled product, and generating normal levels of the mechanical properties. In addition, step S230 may also include: analyzing the mechanical properties of the qualified hot-rolled products of the same steel grade and the same thickness as the problem hot-rolled product, and generating the normal level of the mechanical properties.

Step S240, analyze a component normal level of the qualified hot-rolled products, and compare a component data of the problem hot-rolled product with the component normal level. The normal level of composition may include the mean and standard deviation of the composition in the qualified hot rolled products. Step S240 may include: analyzing the component data of the qualified hot-rolled products produced at different times by a device producing the problematic hot-rolled product, and generating the normal level of the component. Step S240 may also include: analyzing the composition data of the qualified hot-rolled products of the same steel grade and the same thickness as the problem hot-rolled product, and generating the normal level of the composition.

Step S250, analyze and compare the process parameters of the hot-rolled product in question and the qualified hot-rolled products. Step S250 may include: analyzing the process parameters of the qualified hot-rolled products produced by a device producing the hot-rolled product in question at different times, and generating a normal level of the process parameters. Step S250 may also include: analyzing the process parameters of the qualified hot-rolled products of the same steel grade and the same thickness as the hot-rolled product in question, and generating a normal level of process parameters. The normal level of the process parameters includes the average value and standard deviation of the process parameters, such as the average value and standard deviation of the predetermined finish rolling temperature (PDI-FT).

In step S260, a process parameter control logic is established, and a plurality of control process parameters in the process parameter control logic are compared with the process parameters of the hot-rolled product in question.

The following describes how the present invention realizes the determination of the causes of defects in hot-rolled products through the examples of Fig. 3 to Fig. 9 . First, enter the coil number (COIL-NO) of the hot-rolled product in question, ie, 5299071, into the system for determining the cause of defects in the hot-rolled product of the present invention, and then the basic order information and unqualified mechanical properties of the hot-rolled product in question can be obtained. The basic information of these orders includes that the customer is XX Co., Ltd., the coil number is 5299071, the heat number (HEATID) is 1SG101030, the steel grade number (MIC-NO) is 349788, the steel grade specification (MIC-GRADE) is 7570, and the scheduled completion of rolling The temperature (PDI-FT) is 920 degrees, the scheduled coil temperature (PDI-CT) is 670 degrees, the specification sheet finish rolling temperature (SPC-FT) is 913 degrees, and the specification sheet coil temperature (SPC-CT) is 669 degrees. The yield strength (YS) and tensile strength (TS) of the hot-rolled product (coil number 5299071) at the HSM position T were significantly lower than the respective specifications, so it was judged as unqualified (RJR), and the same at the HSM position The elongation (EL) at the H position also did not meet the specification and was also judged to be unacceptable (RJR). Several unacceptable mechanical properties of the hot rolled product in question (coil number 5299071) were confirmed.

Next, as shown in Figure 4, the embodiment of the present invention will analyze several qualified hot-rolled products produced by the same heat ID (HEATID) but at different times (that is, the coil numbers COIL-NO are 5299075, 5299074, 5300948 ) respective mechanical properties. After analysis, it was found that the yield strength (YS), tensile strength (TS) and elongation (EL) of the coil number COIL-NO of 5300948 conform to the specifications of XX Co., Ltd., so that the same equipment (same furnace) can be excluded. The possibility of failure or contamination confirms that the same equipment (same furnace) can function normally.

Next, as shown in Figure 5, the embodiment of the present invention will analyze several qualified hot-rolled products with the same steel grade number (MIC-NO is 349788) and the same thickness (GRADE4 is 7570) as the hot-rolled product in question (coil number 5299071). Mechanical properties of rolled products and yield average yield strength (YS(AVG)), yield standard deviation (YS(STD)), average tensile strength (TS(AVG)), tensile strength of these qualified hot rolled products Strength Standard Deviation (TS(STD)), Elongation Average (EL(AVG)) and Elongation Standard Deviation (EL(STD)). At the same time, the corresponding process parameters such as finishing temperature (FT) and coil temperature (FT) are provided together. From this, it can be confirmed that when the MIC-NO is also 349788 and the GRADE4 is also 7570 (same specification thickness), it is possible to produce a hot-rolled product that meets the specifications of XX Co., Ltd.

Then, as shown in Figure 6, first collect a component data of the hot-rolled product in question (coil number 5299071), which includes carbon (C), manganese (Mn) in the hot-rolled product (ie, TCH) in question. ), phosphorus (P), sulfur (S), silicon (Si) and other components. And analyze the average value of carbon (C), manganese (Mn), phosphorus (P), sulfur (S), silicon (Si) and other components of these qualified hot-rolled products whose MIC-NO is also 349788 and GRADE4 is also 7570 and standard deviation. Through such analysis and comparison, it was found that carbon (C) and phosphorus (P) in the hot-rolled product (coil number 5299071) of this problem exceeded the average value.

Next, as shown in Figure 7, the process parameters of these qualified hot-rolled products whose MIC-NO is also 349788 and GRADE4 is also 7570 are further analyzed, such as scheduled finishing temperature (PDI-FT), scheduled coil Average value and standard deviation of parameters such as temperature (PDI-CT), time in furnace, preheating time, soaking time, rough rolling exit temperature (R2DT), finishing rolling entry temperature (FET). Thereby, it is evaluated whether the process parameters of these qualified hot-rolled products can be applied to the similar hot-rolled products of XX Co., Ltd.

Finally, as shown in Fig. 8, the embodiment of the present invention can generate a comprehensive judgment result of the causes of defects of hot-rolled products. For example, the hot-rolled product (coil number 5299071) in question does not meet the mechanical properties of the specification, and it can be judged after analysis. The reason is that the composition of the steel coil number 5299071) is problematic, for example, carbon (C) exceeds two standard deviations (STD) of the mean. And it can remind (PDI-FT is different from SPC-FT, and PDI-CT is different from SPC-CT. In addition, the present invention can even suggest customer XX Co., Ltd., can fine-tune similar hot-rolled products according to the above analysis and comparison For example, adjust SPC-FT to 908 and SPC-CT to 635, because such process parameters can more stably produce hot-rolled products that meet customer specifications.

Finally, the embodiments of the present invention can also establish process parameter control logic according to the mechanical properties, component data, and process parameters in the foregoing analysis. As shown in Figure 9, in the process parameter control logic No. 1, when the input predetermined value (PDI) is greater than 433 degrees and 434 degrees, and the billet reheating temperature (SRT) is less than 1200 degrees, the specification SAE When the process parameters of J1392 are applied to the steel grade GT. 50, the problem of insufficient niobium solid solution and insufficient strength may occur. In this way, the results of judging the cause of defects in hot-rolled products can be effectively accumulated. Once the same process parameters and conditions occur in the future, the cause of defects can be immediately judged, or an early warning can be made.

As mentioned above, the method and system for judging the causes of defects in hot-rolled products provided by the present invention actively collect the mechanical properties, composition data and process parameters of hot-rolled products in question and qualified hot-rolled products, thereby shortening the judgment of causes of defects in hot-rolled products. time. By analyzing and comparing the difference between the normal level of mechanical properties, the normal level of composition and the normal level of process parameters between the hot-rolled product in question and the qualified hot-rolled product, the cause of the defect of the hot-rolled product can be judged more comprehensively.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the appended patent application.

100: Defect cause judgment system for hot rolled products 110: Data Collection Module 110a: Basic data collection computer 110b: Quality Control Data Collection Computer 110c: Process parameter collection computer 120:Database 130: Processing Modules 135: Process parameter control logic 200: Method for judging the causes of defects in hot-rolled products S210～S260: Steps

FIG. 1 is a schematic diagram of a system for judging the causes of defects in hot-rolled products according to an embodiment of the present invention. FIG. 2 is a one-step flow chart of a method for judging the causes of defects in a hot-rolled product according to an embodiment of the present invention. FIG. 3 is a schematic diagram of step S220 in an example of applying the embodiment of the present invention. FIG. 4 is a schematic diagram of step S230 in the example of FIG. 3 . FIG. 5 is another schematic diagram of step S230 in this example of FIG. 3 . FIG. 6 is a schematic diagram of step S240 in the example of FIG. 3 . FIG. 7 is a schematic diagram of step S250 in the example of FIG. 3 . FIG. 8 is a schematic diagram of the determination result of the cause of the defect of the hot-rolled product in the example of FIG. 3 . FIG. 9 is a schematic diagram of a process parameter control logic in an embodiment of the present invention.

200: Method for judging the causes of defects in hot-rolled products

S210~S260: Steps

Claims (8)

A method for judging the causes of defects in a hot-rolled product, comprising: confirming an unqualified mechanical property in a hot-rolled product in question; analyzing a normal level of a mechanical property of a plurality of qualified hot-rolled products, and comparing the unqualified mechanical property with the mechanical property of the machine The normal level of properties; analyze the normal level of a component of the qualified hot-rolled products, and compare a component data of the hot-rolled product in question with the normal level of the component; analyze and compare the hot-rolled product in question with the qualified hot-rolled products multiple process parameters of the product; and establishing a process parameter control logic, and comparing the multiple control process parameters in the process parameter control logic with the process parameters of the hot-rolled product in question. The method for judging the causes of defects in hot-rolled products as described in claim 1, wherein the normal level of the mechanical properties of the qualified hot-rolled products is analyzed, and the unqualified mechanical properties are compared with the normal level of the mechanical properties, comprising: analyzing the production The mechanical properties of the qualified hot-rolled products produced by an equipment of the hot-rolled product in question at different times, and the normal level of the mechanical properties is produced. The method for judging the causes of defects in hot-rolled products as described in claim 1, wherein the normal level of the mechanical properties of the qualified hot-rolled products is analyzed, and the unqualified mechanical properties and the normal level of the mechanical properties are compared, including: analyzing and the normal level of the mechanical properties. The mechanical properties of the qualified hot-rolled products of the same steel grade and thickness of the hot-rolled product in question, and the normal levels of the mechanical properties are produced. The method for judging the causes of defects in hot-rolled products as described in claim 1, wherein the normal level of the component of the qualified hot-rolled products is analyzed, and the component data of the hot-rolled product in question is compared with the normal level of the component, including: analyzing The compositional data of the qualified hot-rolled products produced at different times by an equipment producing the problematic hot-rolled product, and the normal level of the composition is generated. The method for judging the causes of defects in hot-rolled products as described in claim 1, wherein the normal level of the component of the qualified hot-rolled products is analyzed, and the component data of the hot-rolled product in question is compared with the normal level of the component, including: analyzing The composition data of the qualified hot-rolled products of the same steel grade and the same thickness as the hot-rolled product in question, and produce the normal level of the composition. The method for judging the cause of defects in a hot-rolled product according to claim 1, wherein analyzing and comparing the process parameters of the hot-rolled product in question and the qualified hot-rolled products, comprising: analyzing the process parameters of producing the hot-rolled product in question The process parameters of the qualified hot-rolled products produced by a device at different times, and a normal level of the process parameters is generated. The method for judging the causes of defects in a hot-rolled product according to claim 1, wherein analyzing and comparing the process parameters of the hot-rolled product in question and the qualified hot-rolled products, comprising: analyzing the same steel grade as the hot-rolled product in question and The process parameters of the qualified hot-rolled products of the same thickness, and a process parameter normal level is generated. A system for judging the causes of defects of hot-rolled products, comprising: a data collection module configured to collect data of a plurality of hot-rolled products; a database configured to store the hot rolled product data from the data collection module, wherein the hot rolled product data includes a plurality of mechanical properties, a plurality of composition data and a plurality of process parameters; and a processing module A group configured to access the hot-rolled product data in the database to perform: confirming an unqualified mechanical property in a problem hot-rolled product; analyzing a normal level of a mechanical property of a plurality of qualified hot-rolled products , and compare the unqualified mechanical properties with the normal level of the mechanical properties; analyze the normal level of a component of the qualified hot-rolled products, and compare a component data of the hot-rolled product in question with the normal level of the component; and analyze and Compare the process parameters of the problem hot-rolled product and the qualified hot-rolled products; wherein the processing module has a process parameter control logic, and the processing module compares a plurality of control process parameters in the process parameter control logic with the These process parameters of the hot rolled product in question.

Images