JPH0452222A - Material quality designing device for steel products - Google Patents

Abstract

PURPOSE:To automate the setting of initial conditions and the designing of the material quality based on the results thereof in designing the material quality of steel products by determining the fundamentals that the example of the specifications nearest the requested specifications is searched out of a data base and that the conditions thereof are set in the initial conditions for designing the material quality. CONSTITUTION:This device is provided with an input means which inputs the information on the requested specifications; a specialist data base means in which the standard information to limit the specification of the products by the information of the steel products to be used in designing the magnetic quality and the identification information thereof are accumulated; an actual result data base means which indicates the more concrete specifications of the products than the specialist data base concerning the past actual results of the material quality design; an initial condition setting means which obtains the information indicating the conditions concerning the specification analogous with the required specifications by retrieving the contents of the above- mentioned specialist data base means and the actual result data base means and sets this information in the initial conditions of the material quality setting; and a material quality designing means which executes the material quality design in accordance with the initial conditions set by the above-mentioned initial condition setting means.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the material design of steel materials, and particularly to the material design based on the setting of initial conditions and the results thereof.

[Prior Art] When a steel manufacturer receives a request from a user for a specification that has not been matched in the past, it is necessary to carry out material design for the new specification, and this type of material design number is required. In this case, first of all, it is necessary to determine the initial conditions for the design.

The elements that must be determined as initial conditions are:
For example, there are component systems, upper and lower limits of components, manufacturing methods, etc.

Regarding this type of material design and setting of its initial conditions,
Experts who are familiar with all of the above will recall past material design results and manufacturing results based on their knowledge,
We look for similar cases (accomplished results), organize our ideas on how to manufacture them, and through a process of repeated thought and error, determine the initial conditions and design the materials in detail.

Until now, there was no equipment that could automatically perform this kind of work, so experts were always needed to design materials and determine their initial conditions, and it took a long time to consider them. was unavoidable.

[Problems to be Solved by the Invention] An object of the present invention is to enable setting of initial conditions and automation of material design based on the results in material design of steel materials.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an input means for inputting information on required specifications; at least a composition system, upper and lower limits of composition of steel materials used in material design; An expert database means in which information indicating the conditions of the manufacturing method is accumulated together with standard information that limits the specification range of the product and its identification information. A performance database means in which information indicating lower limit values and manufacturing method conditions is accumulated together with specification information and identification information indicating specifications of the product that are more specific than the expert database means; The contents of the expert database means and the performance database means are searched, information indicating at least the component system, upper and lower limit values of the components, and manufacturing method conditions regarding specifications similar to the required specifications is obtained, and the information is used for material setting. An initial condition setting means for setting initial conditions; and a material design means for executing material design based on the initial conditions set by the initial condition setting means.

[Operation] The present invention is based on searching the database for an example of the specifications that are closest to the required specifications, and setting its conditions as the initial conditions for material design. Therefore,
A database that accumulates similar cases is required, but since data corresponding to all specifications does not exist as a track record, simply establishing a database based on past results will reduce the probability of finding information on similar specifications. It gets lower.

Therefore, in the present invention, based on the empirical rules of experts, the component system, upper and lower limit values of the components, and! ! ! An expert database means is provided in which information indicating manufacturing and joining method conditions is registered together with standard information that limits the specification range of the product and its identification information. Therefore, according to the present invention, even for required specifications for which there is no past performance of similar specifications, information on similar specifications (component system, upper and lower limits of components, manufacturing method, etc.) and set the initial conditions for material design. If there is a past record of similar specifications, accurate information closer to the required specifications can be set as the initial conditions.

In this case, specific material design (determination of component system, setting of upper and lower limit values of components, determination of manufacturing method, etc.) is performed for the initial conditions set in this way.

Since the results of material tests (impact test results, tensile test results, etc.) are required, we have established a manufacturing results database. The manufacturing results database includes test results from actual manufacturing and various test results, and contents covering data necessary for material design are registered. Material design is performed using this manufacturing record database, and a determination is made as to whether or not the required specifications can be guaranteed.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[Example] This example will be explained using a section steel as an example. FIG. 1 shows the configuration of a material design device that implements the present invention.

Referring to FIG. 1, an input device 11 is connected to the computer main body 2 for searching the required specifications of the shaped steel and outputting the processing results. On the storage device of the computer main body 2, a user interface 3. Knowledge base 4. Inference engine 5
．． A case database 6 and a manufacturing record database 7 are arranged as software.

Information such as required specifications input by the user is input by the input/output device 1 and passed to the inference engine 5 via the user interface 2. The inference engine 5 processes input requirement specification information based on inference rules registered in the knowledge base 4 in advance. During processing, the contents of the case database 6 and the manufacturing record database 7 are referred to.

In this embodiment, the contents of the similar case database 6 are composed of an expert database DBI and a track record database DB2, as shown in FIG. The expert database DBI has registered information organized based on experts' empirical rules regarding material design, and the performance database DB2 has organized data on past material design results organized by case group. is registered in. A specific example of the contents of the expert database DBI is shown in FIG. 3a, and a specific example of the contents of the performance database DB2 is shown in FIG. 3b.

Referring to Figure 3a, the expert database DBI includes:
It is broadly divided into a representative section, a premise section, and a conclusion section. Representative department spec No.

is an identification code that collectively indicates the main contents of the precondition section.5For example, IV-8M418- shown in the representative section.
L-1 has a standard abbreviation of 5N41B, has impact characteristics, is oriented, and has a serial number of 1.

The delegation also includes priorities. That is, there may be a plurality of specifications with the same specification number, and in that case, one of them is selected in order according to the priority order.

The performance database DB2 includes a total of 11 tables, including common items for feasibility study, size and length assumption table, material study specification table, and material result specification table shown in FIG. 3b. Each table has a study number, as shown in Figure 3b.

They are linked by three types of information: mold size and length -m. The four tables shown in FIG. 3b are used in the similar case search described below. In addition, expert database DB
The item corresponding to the specification No. of I is included in the item of the material result specification table of the performance database DB2.

An outline of the operation of the apparatus shown in FIG. 1 is shown in FIG. 4, and the contents of each step in FIG. 4 will be described below.

100: In this step, required specification information is input.

Here, as an example of a requirement specification, the requirement specification affiliation is JIS.
, the required standard symbol is 5M41B, the shape steel product name is H-shape steel, the shape steel product dimensions 1 are 300 x 300 x 10 x 1
5 (web height x flange width x web thickness x flange thickness)
, Shape steel product dimensions 2 are 250 x 250 x 9 x
14 (web height x flange width x web thickness x flange thickness).

The case where the material specification has impact characteristics, the impact temperature is -40°C, the impact direction is 1, the minimum absorbed energy is 2.8 Kgf or more, and the notch shape is V will be described below.

101: The requirement specification information input in 100 is actually the fifth
As shown in figure a, the required specifications for size and length (al, a2
) and material requirement specifications (bx, b2). Here, in order to facilitate subsequent processing, for items with the same specifications, the required specifications for size and length and the required specifications for material are combined into one, and the information is consolidated. In other words, the fifth
Requirement specifications a1 and bl and a2 and b2 shown in FIG. 5A are assembled, respectively, and converted into two sets of requirement specification information as shown in FIG. 5B.

102: Search for similar cases from the expert database DBI in the case database 6. In other words, a search is made for the content of the precondition group shown in FIG. 3a that matches the content of the required specification. In this example, the impact temperature of the required specification is 140°C, so the IV shown in the specification No. of 1 representative part is
-5N41B-L-3 (identification code or representative item) is set as the search result.

103: If there are multiple types of requirement specifications, group them in advance for those that are expected to have the same design content,
Reduce the amount of data to be considered, specifically Step 1
If there are multiple search results with the same identification code for 02,
They are regarded as the same groove, and material design processing is performed on only one of them. In this example, for the required specifications of multiple sizes, all of them are IV-5M41B-L.
Since -3 is assigned as the identification code, these two are assigned to one group. As for which product size in this group to consider, the one with the thicker plate thickness (flange thickness) is usually selected. In other words,
Tensile strength is the most important standard content (41K in this example)
This rule is based on the fact that the thicker the plate, the more difficult it is to guarantee when considering the guarantee of 300 x 300 x 10
15 as the dimension and discuss it.

Note that the thinner plate may be selected for consideration. In other words, if the yield ratio characteristics are included in the required specifications,
The thinner the plate, the more difficult it is, so choose the thinner one (yield ratio = yield point/tensile strength).

In actual manufacturing examples, the yield ratio of the thicker flange is 0.
75 (33/44), and the yield specific force of the thinner flange was 0.80 (36/45). In this example, the thicker the plate, the smaller the yield point and the tensile strength, and the thinner the plate, the larger the values. In the case of a similar manufacturing method, the thinner the plate, the higher the strength. It means getting bigger.

104: Since the required specifications to be considered have been clarified through the above processing, the content of the standard is grasped based on the plate thickness of the specifications, and preconditions for consideration are generated. For items included in the standard that do not exist in the required specifications, the content of the standard is adopted, and the required specifications and standards are combined to form the prerequisites for consideration.

In this example, the required specifications for the material are only impact properties, and there are no other items such as component values or tensile strength, so the required specifications are adopted for the former, and the contents of the standard are adopted for the latter.

105: In this step, the performance database DB2 on the similar database 6 is referred to to search for similar performance data based on various conditions. Search conditions include product name, standard abbreviation,
Series code, material study specifications (tensile strength, impact properties, etc.), and the identification code obtained in step 102 (IV-
5N41B-L-3).

Note that whether or not a similar case can be used is determined based on whether there has been any subsequent change in the contents of the expert database used when considering the similar case. For example, if the spec No. of the expert database used when considering similar cases is aaa, the spec No.
If o is also aaa, the results obtained when examining similar cases can be used as initial conditions in this examination, but it is necessary to check them here. In other words, if the aaa of the expert database when similar cases were examined has undergone some kind of modification since then, the contents at the time of examination and the current contents are different, so in that case it cannot be used as an initial condition. Therefore, here, a spec-correction flag is provided to determine whether or not correction is required.

If a similar case is found on the performance database DB2, its contents are set as the initial conditions for material design. If no similar case is found, the identification code (I
V-5M41B-L-3).

The expert database DBI is searched again, and the search results are set as the initial conditions for material design. Note that there may be a plurality of cases with the same identification code in the expert database, but in that case, one case is selected based on the priority order registered on the database.

The processing flow of step 105 is shown in FIGS. 6a, 6b, 6c, and 6d, so please refer to them.

106: Set the contents of the most similar case of the search results in the previous step 105 as the initial conditions for material design.

107: This process, that is, material design, is to consider a manufacturing method that satisfies the prerequisites for consideration, and sets the component system, upper and lower limit values of the components, manufacturing method (controlled rolling, heat treatment, etc.), etc. The initial conditions for this design are determined in the processing up to step 106.

This processing flow is shown in FIG. 7 (step 107).

In the material design in this embodiment, first, it is determined whether or not the impact characteristics can be guaranteed. Normally, if the required specifications include impact characteristics, we start by determining whether or not they can be guaranteed.

To determine whether or not the impact properties can be guaranteed, use the initial conditions of the material design as search conditions, search for test temperature, absorbed energy, brittle fracture ratio, etc. from the manufacturing record database, represent the search results in a transition diagram, and determine the required specification contents. This is done by comparing the actual values. In this case, if the impact temperature of the required specifications is higher than the impact temperature of the brittle fracture ratio of 50%, and the actual absorbed energy value at that temperature (impact temperature of the required specifications) is larger than the absorbed energy value of the required specifications, Guaranteeability determination is based on guaranty possible. In addition, if the impact temperature of the required specifications is lower than the impact temperature with a brittle fracture ratio of 50%, and the actual absorbed energy value at that temperature (impact temperature of the required specifications) is smaller than the absorbed energy value of the required specifications, the warranty is guaranteed. The determination of availability cannot be guaranteed. Furthermore, although the impact temperature of the required specifications is lower than the impact temperature at which the brittle fracture ratio is 50%, the actual absorbed energy value at that temperature (impact temperature of the required specifications) is significantly larger than the absorbed energy value of the required specifications. In this case, the guaranteeability determination is set as guaranteeable. In the case of this example, the impact temperature of the required specifications is higher than the impact temperature at which the brittle fracture rate is 50%, and the actual absorbed energy value at that temperature (impact temperature of the required specifications) is
Since it is larger than the absorbed energy value of the required specification, the guaranteeability determination becomes guarantable.

Next, to determine whether or not the 6 strength properties can be guaranteed, the content of the initial conditions for material design is used as a search condition, and the tensile strength, yield point, elongation, component value, and carbon equivalent are determined from the manufacturing record database. etc., represent the search results in a scatter diagram, and compare the required specification contents and actual values.

In this case, draw a line on the scatter diagram that takes into account the variation, derive the carbon equivalent range to ensure the required strength,
Compare with the carbon equivalent obtained under the initial conditions of material design. Therefore, if the carbon equivalent obtained under the initial conditions is within the carbon equivalent range for ensuring the required strength, the determination of whether or not the material is guaranteed is determined to be guaranteed.

In addition, if the carbon equivalent obtained under the initial conditions is outside the carbon equivalent range for ensuring the required strength, each component value (
For example, C, Mn, etc.) are changed to ensure the required carbon equivalent. As a result, the guaranteeability determination becomes guaranteeable. No matter how the component values are changed, if the required carbon equivalent cannot be secured, the determination of whether or not the guarantee is possible is determined to be non-guaranteable. In the case of this example, the carbon equivalent obtained under the initial conditions of material design is within the carbon equivalent range to ensure the required strength.
The guaranteeability determination becomes guaranteeable.

Next, we will perform component design to guarantee welding characteristics.

In this example, there are no required specifications for welding properties, but in some cases, based on the material design results that have been performed so far, component values are substituted into the formula for welding properties to find the values. Compare the required value with the required value to determine whether or not the guarantee can be guaranteed. This example is
As there are no required specifications for welding characteristics, no guarantee judgment has been performed.

Finally, extras are calculated based on the material design results.

For extras, the composition range of the material design differs from the composition range of normally manufactured products (hereinafter referred to as steel type), and for example, when alloying elements are added, the manufacturing cost increases. In such cases, extra calculations are required. Note that the steel type is determined by the initial conditions of material design.

In this example, since it falls within the steel type range, the extra is 0.
becomes.

The contents of the manufacturing record database are shown in FIG. The manufacturing performance database registers test results and various test results from actual manufacturing.

Referring to Figure 8, the common key during manufacturing (steel type code,
Standards, mold size, etc.) and details of actual results (component value 2 mechanical properties, (tensile strength, yield point, elongation, etc.) Value 9 Search for mechanical properties etc. This search result is 10
As shown in the processing content in step 7, it is represented by a transition diagram, a scatter diagram, etc., and component design and manufacturing feasibility determination are performed.

108: Add the material design result of 107 to the performance database DB2 on the case database 6 as the latest similar case. In addition, in this material design, one dimension (300
We considered only the product with dimensions (250 x 250 x 9)
The results of x14) are considered to be the same as the results of this study, and the same contents (other than the dimensions) are registered in the performance database DB2. In this way, the results of the study are accumulated on the performance database so that they can be used in the next material design.

All the processes in steps 100 to 108 in FIG. 4 are executed according to the contents of a group of rules registered in advance on the knowledge base 4, but the knowledge base is a collection of data groups for reference, and the actual processing is It is executed by the inference engine 5.

In the above example, a case was explained in which both the setting of initial conditions and the material design based on the results are automatically processed by one device, but the setting of initial conditions and the material design based on the results can be automatically processed by separate devices. It may be processed or the results of setting the initial conditions may be simply displayed and changes may be made so that the material design after setting the initial conditions is carried out by a human.

[Effects of the Invention] As described above, according to the present invention, initial conditions can be automatically determined in material design of a section steel. Therefore,
No experts are required, and the time required for material design can be shortened. In addition, information on similar specifications that are close to the required specifications is extracted from the database and set as initial conditions, reducing the need for design changes to past design results and reducing the burden on material design. can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an apparatus for implementing the present invention. FIG. 2 is a block diagram showing the configuration of the case database 6 shown in FIG. 1. Figures 3a and 3b respectively represent expert D from Figure 2.
This is a map showing a representative example of the contents of B and performance DB. FIG. 4 is a flowchart showing an outline of the processing content of the apparatus shown in FIG. FIGS. 5a and 5b are maps showing the structure of the required specification information before and after processing, respectively. 6a, 6b, 6c, and 6d are flowcharts of step 105 in FIG. 4. FIG. 7 is a flowchart showing the contents of step 107 in FIG. FIG. 8 is a map showing a typical example of a manufacturing record database used in material design. FIG. 9 is a perspective view showing the appearance of the H-section steel. Input/output device (input means) 2: Computer body 3: User interface 4: Knowledge base 5: Inference engine (initial condition setting means, material design means) 6: Case study database 7: Manufacturing results database

Claims (1)

[Claims] Input means for inputting information on required specifications; information indicating at least the composition system, upper and lower limits of the composition, and manufacturing method conditions of the steel material used in material design, which limits the specification range of the product. Expert database means accumulated together with standard information and its identification information; information indicating at least the component system, upper and lower limit values of the product, and manufacturing method conditions regarding past material design results;
stored together with standard information and identification information indicating specifications of the product that are more specific than the expert database means;
Performance database means: Searches the contents of the expert database means and performance database means based on the required specifications, and indicates at least the conditions of the component system, upper and lower limit values of the components, and manufacturing method regarding specifications similar to the required specifications. An initial condition setting means for acquiring information and setting the information as an initial condition for material design; and a material design means for executing material design based on the initial conditions set by the initial condition setting means. Material design equipment.