JP2009020807A - Production lot arranging method of steel product, arrangement device, and computer program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production lot arranging method for arranging an appropriate production lot and efficiently and rationally producing a product in which chemical components and mechanical characteristics satisfy order requirements when producing a steel product on the basis of an order from a user. <P>SOLUTION: A method for arranging a plurality of orders different in standards into one production lot while estimating the mechanical characteristics of a steel product by using a DB type material prediction system 5 which is provided with a production information storage means 6 for storing actual results in the past and a material estimating means 7 for estimating the mechanical characteristics obtained when the steel product is produced on the basis of an input designation value by using data of the production information storage means, includes: setting chemical components which satisfy specifications of respective orders; estimating the mechanical characteristics in the chemical components by using the DB type material prediction system; and putting the orders together as the production lot of the chemical component when estimation values of the mechanical characteristics of all the steel products to be put together satisfy order specifications. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method for knitting a production lot of a steel product, a knitting apparatus, and a computer program therefor. More specifically, when producing a steel product based on an order from a customer, the chemical composition and mechanical properties are ordered. The present invention relates to a production lot knitting method, a knitting apparatus, and a computer program therefor that can efficiently and rationally produce a steel product that satisfies the above requirements.

  In the steelmaking integrated steelworks, various steel products are manufactured through the process shown in FIG. That is, in the blast furnace 11, iron ore is reduced with coke to produce pig iron whose composition is substantially constant, while in the converter 12, it is knitted from a group of orders of a certain steel product for a certain predetermined period. In order to refine a steel type corresponding to a production lot as a production unit, that is, based on an order from a customer, the hot metal is subjected to oxygen blowing to produce molten steel having a predetermined composition. Although not shown in FIG. 3, when the molten steel having the target composition cannot be produced only by the converter 12, the molten steel produced by the converter 12 is used in a secondary smelting furnace such as an RH vacuum degasser. It may be refined.

  The molten steel produced in this way is cast by the continuous casting machine 13, cut to a predetermined length based on the order, and becomes a slab of a predetermined shape which is a semi-finished product. The manufactured slab is sent to the next thick plate process 14 and hot rolling process 15. The product rolled in the thick plate process 14 is shipped to the customer as a thick steel plate, and the product rolled in the hot rolling process 15 becomes a hot-rolled steel plate called a so-called hot coil, and is shipped to the customer as a product as it is. Further, after passing through the cold rolling process 16 and the plating process 17 which are lower processes, the steel sheet is shipped as a cold rolled steel sheet or a surface-treated steel sheet. Slabs that do not correspond to orders are kept in stock until a matching order arrives. Steel products include other products such as shaped steel, steel bars, and steel pipes, but are omitted in FIG.

  In this manufacturing process, the converter 12 is operated in a batch mode, and a ladle made of molten steel manufactured every refining (each refining is called “charge” or “heat”). Therefore, productivity can be maintained regardless of the size of the production lot, which is a production unit. However, in the continuous casting machine 13, in order to improve the productivity, it is necessary to continuously cast the molten steel for several charges produced in the converter 12 (referred to as “continuous casting”). The larger the production lot, the better. The production lot over several charges is required. In other words, several charges of the same steel type or similar steel types are required. In this case, casting can be performed continuously even with different steel types (referred to as “different steel types”), but not only the joint portion of the steel type needs to be scrapped but also the joint portion of the steel type in order to reduce the component mixing portion. In the operation in which the partition iron plate is installed in the mold, the occurrence rate of breakout is high, and the productivity of the continuous casting machine may be reduced due to the occurrence of breakout. For these reasons, it is desired to increase the production lot in the manufacturing process of steel products.

  By the way, the characteristics of steel products are classified as standards, and chemical components and mechanical properties are specified for each standard. In particular, chemical components are the dominant factors in classifying standards. Conventionally, the type of steel is identified as a steel type for each standard.

In the manufacture of steel products, for the reasons described above, it has been attempted to increase the production lot as much as possible by aggregating multiple orders over a certain period of time. The grouping of steel types that can be consolidated was registered as a standard, and the production lot was increased by combining the same steel types. For example, in Patent Document 1, a lower standard is combined with a higher standard to increase the production lot.
JP 2006-159274 A

  In this way, when the orders of different standards are aggregated to increase the production lot, that is, when similar steel types are aggregated by satisfying not only chemical components but also mechanical properties, safety in product design Therefore, as proposed in Patent Document 1, there is only a countermeasure to consolidate the lower grades to the upper grades. Therefore, the upper grade is compared with the lower grades, although the production lot is expanded. In general, it contains a large amount of alloying elements such as Si and Mn, so that it has become a large irrational component.

  The present invention has been made in view of such circumstances, and the purpose thereof is to produce an accurate production lot when producing steel products based on orders from customers, and as a result. A method and apparatus for knitting a production lot of a steel product, a knitting apparatus, and a computer program therefor, capable of efficiently and rationally producing a steel product whose chemical composition and mechanical properties satisfy order requirements That is.

  The method for organizing a production lot of steel products according to the first invention for solving the above-mentioned problem is an example of actual values of chemical components and operating conditions and actual values of mechanical properties for each steel product manufactured in the past. Manufacturing information storage means to be stored as the mechanical properties obtained when the steel product is manufactured based on the input values of the chemical composition and operating conditions inputted, using the data stored in the manufacturing information storage means And estimating the mechanical properties of the steel product using a database type material prediction system comprising a material estimation means, and confirming that the estimated value satisfies the specifications of the order, and a plurality of different standards This is a method of knitting steel product production lots, where the chemical orders that meet the specifications of each order are set, and the set chemical components are organized. When the mechanical properties of steel products are estimated using the database type material prediction system, and the estimated mechanical properties of all steel products to be aggregated satisfy the specifications of the order, These orders are collected as a production lot of the chemical component.

  The manufacturing lot knitting method for steel products according to the second invention is the carbon equivalent as a chemical component of the steel product when the mechanical properties of the steel product are estimated using the database type material prediction system in the first invention. It is characterized by using.

  The production lot organization device for steel products according to the third invention comprises production information storage means for accumulating actual values of chemical components and operating conditions and actual values of mechanical properties as examples for each steel product manufactured in the past. The material estimation means for estimating the mechanical properties obtained when the steel product is produced based on the input values of the chemical components and the operating conditions, using the data stored in the production information storage means, In addition to estimating the mechanical properties of steel products using a database-type material prediction system equipped with the above, it is possible to collect a plurality of orders with different standards while confirming that the estimated value satisfies the specifications of the order. This is a production device for steel product production lots that is organized into production lots, and sets chemical components that satisfy the specifications of each order, and mechanical properties of steel products at the set chemical components. When the estimated values of mechanical properties of all steel products to be aggregated are estimated using the database type material prediction system and satisfy the specifications of the order, a plurality of orders with different standards are It is characterized by being collected as a production lot.

  A computer program according to a fourth invention is a program for causing a computer to execute the production lot organization method for steel products according to the first or second invention.

  According to the present invention, a mechanical property of a steel product is estimated using a database type material prediction system, and a plurality of orders with different standards are aggregated while confirming that the estimated mechanical property satisfies the specifications of the order. Since it is organized into one production lot, it is not only concentrated in the upper grade of the standard as in the past, but also in the intermediate grade between the upper grade and the lower grade. Is achieved. Further, since the database type material prediction system is used, a production lot can be organized quickly, efficiently and accurately.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing the overall configuration of a production plan formulation system suitable for carrying out the present invention, and FIG. 2 is a flow chart when a production lot is organized according to the present invention. Here, a thick steel plate is taken up as a steel product, and an example in which a thick steel plate is manufactured based on order information will be described.

  An order is received from a customer, and the data is input to the order registration system 1. The order data includes product specifications, product size, mass, delivery date, and the like. Here, the product standards include chemical components of the thick steel plate, tensile strength, yield point, elongation, low temperature toughness, creep properties, and other mechanical properties, weldability, corrosion resistance, and the like.

  The chemical component as a standard has a relatively wide component range, and is not useful for organizing a production lot as it is, so in the present invention, each order is managed using a carbon equivalent instead of the chemical component. In other words, the mechanical properties of each order are compared with the past production results of thick steel plates, and each order is given a carbon equivalent value that seems to satisfy or slightly lack the mechanical properties of that order. The equivalent value is used as an alternative to the chemical component. Since the imparted carbon equivalent value is often corrected in the end, it is preferable to make it as low as possible. The carbon equivalent is defined by, for example, the following formula (1). The carbon equivalent is increased, the tensile strength and the yield point are increased and the elongation is decreased, and rolling is performed even if the carbon equivalent is the same. It is generally known that mechanical properties change depending on conditions. As long as the carbon equivalent is the same, even a thick steel plate of a different grade can be operated with the same steel type.

Ceq = [% C] + [% Mn] / 6 + [% Si] / 24 + [% Cr] / 5 + [% Mo] / 4 + [% Ni] / 40 + [% V] / 14 …… (1)
However, in the formula (1), Ceq is the carbon equivalent, [% C] is the carbon content (mass%) of the steel material, and hereinafter [% Mn] is the content (mass%) of each element.

This order data is input to the production management system 2 (STEP 1). The production management system 2 selects a thick steel plate of the same or similar standard from a plurality of order data, and combines them to form one slab having a predetermined length that can be cast, and a slab knitting processing system 3; The knitting slab is combined to form one charge, and the charge knitting processing system 4 knitting a plurality of knitted charges so that they can be continuously cast continuously. , And input from the order registration system 1 to the slab knitting processing system 3. The purpose of the present invention is to consolidate even one order of different standards into one production lot, that is, one steel type, and the difference in mechanical properties is too large as in JIS standard SM400 and SM570. When a single steel type is aggregated, a combination in which one of them becomes an excessive chemical component and concentrates to reduce the cost is not an object, and the object is within the range of the same standard or a similar standard. Here, the similar steel types are SM400 and SS400, or SM400 and SM490, and specifically, a combination in a range where the difference in tensile strength is 100 N / mm ² or less.

  The slab knitting processing system 3 selects thick steel plates of the same or similar standard from the input order data, and combines them to form one slab having a predetermined length that can be cast (STEP 2). . The purpose of carrying out this slab knitting work is as follows. The slab cast by the continuous casting machine is cut by a gas cutting machine provided at the end of the continuous casting machine while being transported on the transport roll, but when the length of the slab to be cut is short, a plurality of slabs are cut. There is a problem of falling off the transport roll without getting on the transport roll. Usually, the mass of the steel plate to be ordered is small compared to the mass of the slab. Therefore, the length that can be cast by combining a plurality of steel plates from the order, that is, a predetermined length that prevents troubles during cutting. This is to make one slab having a length. Usually, the slab is further cut off-line. In this case, the size of the slab is determined by the specifications on the rolling mill side. Of course, when a slab having a predetermined length can be secured by the mass of one thick steel plate, the slab knitting operation is not necessary.

  When the slab knitting by the computer is completed, the data is output by the slab knitting processing system 3, and the operator checks whether there is a mistake in the slab knitting. If there is a mistake, correction is input by the operator (STEP 3), and the formation of one slab is provisionally determined.

  Next, for the slab whose knitting is tentatively determined, the database (DB) material prediction system 5 is used to determine whether the mechanical properties of the steel plate manufactured from the slab satisfy the specifications of each order (STEP 4). .

  Here, the database-type material prediction system 5 is a manufacturing information storage means 6 that accumulates actual values of chemical components, actual values of operating conditions, and actual values of mechanical properties as examples for each steel product manufactured in the past. And material estimation means for estimating the mechanical properties obtained when the steel product is manufactured based on the input chemical composition and the indicated value of the operation condition using the data stored in the manufacturing information storage means 6 7. Further, the database type material prediction system 5 is connected to a past operation result database (DB) 8, and every time a new steel product is manufactured, the actual values of chemical components and operation conditions from the past operation result database 8, and the machine The actual property actual value is inputted, and new information is accumulated one after another.

  The specific implementation method of STEP4 is as follows. That is, (1) specification data such as product standards and product plate thickness of each order, (2) allowable range of mechanical properties such as tensile strength, yield point and elongation, (3) carbon previously given to steel products of each order Thickness such as the highest carbon equivalent value among the thick steel plates incorporated in the slab in the equivalent value, the heating temperature of the slab during hot rolling and the rolling finish temperature of the thick steel plate, which are considered to be optimal from past results Steel plate manufacturing condition data is input from the slab knitting processing system 3 to the database type material prediction system 5. The material estimation means 7 of the database type material prediction system 5 estimates the mechanical properties obtained when the thick steel plate is manufactured based on the input data using the data accumulated in the manufacturing information storage means 6, It is determined whether or not the mechanical properties of each steel plate manufactured from the slab satisfy the specifications of each order.

  If thick steel plates that do not satisfy the specifications of the order are generated in the slab, the process returns to STEP1. Then, change one or more of the carbon equivalent value, slab heating temperature, rolling finish temperature, and again, the mechanical properties of each thick steel plate manufactured from the slab by STEP 4 is the specification of each order. Judge whether to satisfy.

  When all the steel plates manufactured from the slab satisfy the specifications of the respective orders, the formation of one slab is determined (STEP 5). The slab after knitting is determined has a predetermined mass and a carbon equivalent value. Similar operations are repeatedly performed to slab slabs, and all of the same or similar standards in the order data input to the slab knitting processing system 3 are incorporated into any slab. The slab whose knitting is determined in STEP 5 is input to the charge knitting processing system 4 constituting the other side of the production management system 2.

  When the slab knitting is completed, the charge knitting processing system 4 creates a casting frame including continuous casting in the same or similar grade steel grade group unit (STEP 6), and then considers the delivery date and carbon equivalent, and the same or similar grade Candidate slabs are selected for each grade group (STEP 7).

  After selecting the candidate slabs, the candidate slabs may be arranged in the order of high or low carbon equivalents, but they are arranged in the order of carbon equivalents, and each charge is organized in order, and each charge is organized (STEP 8). . As a result, the slabs constituting each charge and their order are determined. These charges are arranged in the order of carbon equivalents, and the casting order is determined successively (STEP 9). In this case as well, the order of carbon equivalent may be either high or low, but usually the same order as in the charge knitting.

  Since there is a difference in carbon equivalent in the slabs in one charge determined in this way, the carbon equivalent value of the slab of the maximum carbon equivalent value included in each charge is determined as the carbon equivalent value of the charge, A chemical component is determined based on this carbon equivalent value (STEP 10). In this way, the steel output component of each charge is determined.

  These charges are based on the premise that they are cast continuously. Therefore, if the chemical components of each charge determined by STEP 10 are the same, there is no problem, but the chemical components of each charge may be different. In this case, the pre-charge and the post-charge are mixed at a continuous casting seam, and the chemical component is different from the target component. Therefore, it is determined whether or not the mechanical properties of the steel plate manufactured from the joint slab satisfy the specifications of each order using the database type material prediction system 5 for the continuous cast joint slab (STEP 11). . The specific implementation method of STEP 11 is that data is transmitted from the charge knitting processing system 4 to the database type material prediction system 5 in place of the slab knitting processing system 3, but the rest is the same as in STEP 4 described above. The description is omitted.

  If thick steel plates that do not satisfy the specifications of the order are generated in the joint slab, the process returns to STEP8. Then, the carbon equivalent value is changed, and the steel output component is adjusted again via STEP 9 and STEP 10 (STEP 10), and the new steel output component is used to determine by the database type material prediction system 5 (STEP 11).

  By repeating this operation, the chemical components of the respective charges are determined when all of the steel plates manufactured from the joint slabs satisfy the specifications of the respective orders (STEP 12). The determined chemical components of each charge and the slabs constituting each charge are output from the charge organization processing system 4.

  Further, the production management system 2 and the database type material prediction system 5 are each composed of a computer, each of which includes an arithmetic processing unit (comprising a CPU, a working RAM, a ROM, etc.), a storage unit for storing various programs and various data (for example, HDD (Hard Disc Drive), etc., an operation unit (for example, a keyboard, a mouse, etc.) for inputting operation instructions from consumers, a display unit (for example, a liquid crystal display, etc.) for displaying information such as images and characters, and A communication unit for controlling a communication state between apparatuses via a network or the like is provided. Then, the CPU in these arithmetic processing units performs the functions of each system by executing the processing from STEP 1 to STEP 12 based on the program.

  As described above, according to the present invention, for example, if there is an order of 100 tons of A steel grade (upper grade) and 150 tons of B grade (lower grade), conventionally, the A grade 250 is consolidated into the upper grade. However, by applying the present invention, an intermediate steel grade of steel grade A and grade B is created by the database type material prediction system 5 and can be handled with an intermediate grade of 250 tons. Estimate the mechanical properties of steel products using the mold material prediction system 5, and consolidate multiple orders with different standards into one production lot while confirming that the estimated mechanical properties satisfy the specifications of the order. Since it is organized, it is not only aggregated to the upper grade of the standard as before, but it may also be aggregated to an intermediate grade between the upper grade and the lower grade. Rationalization of the alloy components is achieved. Further, since the database type material prediction system 8 is used, a production lot can be organized quickly, efficiently and accurately.

It is a figure which shows the whole structure of the production plan formulation system suitable for implementing this invention. It is a flowchart figure at the time of knitting a production lot by this invention. It is a manufacturing-process figure of the steel product in the iron and steel integrated type steelworks.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Order registration system 2 Production management system 3 Slab knitting processing system 4 Charge knitting processing system 5 Database type material prediction system 6 Manufacturing information storage means 7 Material estimation means 8 Past operation results database

Claims (4)

For each steel product manufactured in the past, based on the manufacturing information storage means for storing the actual values of chemical components and operating conditions and the actual values of mechanical properties as examples, and the input values of chemical components and operating conditions that are input Steel material machinery using a database-type material prediction system comprising: material estimation means for estimating mechanical properties obtained when a steel product is manufactured using data stored in the production information storage means A method for organizing a production lot of steel products, in which a plurality of orders with different standards are aggregated and knitted into one production lot while estimating the physical properties and confirming that the estimated value satisfies the specifications of the order There,
Set chemical components that satisfy the specifications of each order, estimate the mechanical properties of steel products in the set chemical components using the database type material prediction system, and determine the mechanical properties of all steel products to be aggregated. A method for organizing a production lot of a steel product, wherein a plurality of orders with different standards are aggregated as a production lot of the chemical component when the estimated value satisfies the specification of the order.   The method for organizing a production lot of a steel product according to claim 1, wherein, when the mechanical property of the steel product is estimated using the database type material prediction system, a carbon equivalent is used as a chemical component of the steel product. . For each steel product manufactured in the past, based on manufacturing information storage means that stores actual values of chemical components and operating conditions, and actual values of mechanical properties as examples, and input values of chemical components and operating conditions that are input Steel material machinery using a database-type material prediction system comprising: material estimation means for estimating mechanical properties obtained when steel products are manufactured using data stored in the production information storage means A steel product production lot knitting device that aggregates and organizes a plurality of orders with different standards into one production lot while estimating the physical properties and confirming that the estimated value satisfies the specifications of the order. There,
Set chemical components that satisfy the specifications of each order, estimate the mechanical properties of steel products in the set chemical components using the database type material prediction system, and determine the mechanical properties of all steel products to be aggregated. When the estimated value satisfies the order specification, a plurality of orders with different standards are aggregated as a production lot of the chemical component, and a production lot organization apparatus for steel products,   The computer program for making a computer perform the manufacturing lot organization method of the steel products of Claim 1 or Claim 2.

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