CN112949970A - Method for controlling quality of steel strip product in whole process and automatically judging grade - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 17
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 84
- 238000003908 quality control method Methods 0.000 claims abstract description 11
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Abstract
The invention relates to a method for controlling the whole-process quality and automatically judging the grade of a steel strip product, belonging to the technical field of production methods of cold-rolled automobile plates. The technical scheme of the invention is as follows: converting the production standard according to the requirement of a user, selecting all process parameters, setting a judgment rule of allowable unqualified proportion at different positions of the head, the middle and the tail, and automatically blocking and degrading through a grade and score double-evaluation mode. The invention has the beneficial effects that: through the full-flow quality control and grade score automatic judgment system, special requirements of customers are met, the enthusiasm of workers can be quantitatively excited according to score values, labor force for manual judgment is liberated, and finally product quality control and enterprise economic benefits are effectively improved.
Description
Technical Field
The invention relates to a method for controlling the whole-process quality and automatically judging the grade of a steel strip product, belonging to the technical field of production methods of cold-rolled automobile plates.
Background
The automobile industry is a pillar industry which affects national economic development, technical progress and social modernization, the development of the automobile industry is inseparable from steel materials, and the automobile manufacturing industry is the largest user of thin steel plates. At present, the market competition of automobile plates is more and more intense, a series of requirements of customers on all aspects of automobile plates are more and more strict, the requirements of the customers on high surface quality, stable delivery, user use stability and the like are more full of Linglan, and the traditional manual quality judgment greatly reduces the order delivery rate and unnecessary waste of product quality control.
The invention discloses a method for automatically judging the surface grade of a sub-roll, which is a patent with the Chinese patent application number of 201210084480.5.
The invention discloses a system and a method for multi-dimensional online judgment of steel coil sections, which are invented by Chinese patent application No. 201510146138.7.
The two inventions judge the surface quality, but do not judge the quality of the product in the whole process, and cannot meet the requirements of different users, different product purposes, any personalized requirements and automatic judgment.
Disclosure of Invention
The invention aims to provide a method for controlling the whole-process quality and automatically judging the grade of a steel strip product, which can meet the special requirements of customers and the judgment rules that all process parameters can be selected, different positions can be arranged at the head, the middle and the tail, and the unqualified proportion is allowed to be set through a whole-process quality control and grade score automatic judgment system, achieves the purpose of automatic blocking and degrading through a grade and score double-evaluation mode, can quantitatively excite the enthusiasm of staff according to the score value, liberates the labor force for manual judgment, finally effectively improves the product quality control and the economic benefit of enterprises, and effectively solves the problems in the background technology.
The technical scheme of the invention is as follows: a method for controlling the whole process quality and automatically judging the grade of a steel strip product comprises the following steps:
(1) automatic determination and setting: formulating delivery standards according to user requirements; the product engineer establishes a production and manufacturing standard based on the delivery standard; converting production process information according to component range requirements and product mechanical property requirements in production and manufacturing standards; if the user uses no special specification, the product is produced according to the production and manufacturing standard of the primary conversion, if the user uses special products, the special requirement or use is specified when ordering, and the product engineer further refines and converts the production process information according to the production and manufacturing standard of the primary conversion, and modifies the delivery standard;
(2) selecting an edited judgment item: based on the production and manufacturing standard, selecting parameters related to quality to participate in judgment, dividing the parameters participating in judgment into important parameters and unimportant parameters, modifying the weight of the parameters according to different special requirements of customers by a product engineer, finally judging a mode of grade + score double evaluation, wherein the grade is the lowest grade of the important parameters, blocking and degrading unqualified products, checking the parameters, influencing the parameters to carry out negative excitation on corresponding teams, and finally, the score is the sum of all the parameters;
(3) setting rules, forming a judgment rule by the production and manufacturing standard and production process information, wherein all parameters have single values and continuous values according to process characteristics, different rules can be set according to the head, the middle and the tail of the judgment continuous value parameters due to unstable rolling of the head and the tail, and meanwhile, the judgment rule of the allowable unqualified proportion of the continuous value parameters is reserved;
(4) putting the set rule into use, selecting a product for a period of time to perform simulation judgment, checking the use condition of the rule, revising the rule, circularly operating the step, and formulating a proper judgment rule;
(5) a product engineer can inquire the judgment results of all products under the rule and can also independently inquire according to the volume number;
(6) after the judgment is finished, the continuous value numerical value and the judgment curve are derived, and the judgment result is derived at the same time.
In the step (1), the user requirements comprise delivery date, product grade, thickness, tolerance, surface grade and oiling amount requirements proposed by a user; the delivery standard is to select proper national standard, enterprise standard or sign corresponding technical agreement according to the requirement of the user; the production and manufacturing standard establishes a proper process production route according to delivery standard, and comprises smelting, continuous casting, hot rolling, acid rolling, annealing and flattening process production processes; the production process information comprises the components of the continuous casting finished product, the hot rolling tapping temperature and the final rolling temperature.
In the step (2), the weight of each important parameter is A1、A2…AnThe unimportant parameter is weighted by B1、B2、…BmThe parameters satisfy the following conditions
A1+A2+…+An+B1+B2+Bm＝100％
Wherein n and m are the number of important parameters and unimportant parameters respectively;
the important parameters not only judge the grade but also judge the score, the grade is A, B, C, D, E, wherein the grade B is a manufacturing standard, the grade A product is well controlled strictly, the grade C is slightly worse, the grade D is a release standard, the release standard is obtained by statistical analysis of historical data, and the grade E which is lower than the release standard is unqualified; the score level A is a weighted value, the level B is an 80% weighted value, the level C is a 70% weighted value, the level D is a 60% weighted value, and the level E is a 40% weighted value; the non-important parameters are only scored, and the scoring rules are consistent with the important parameters.
In the step (3), the allowable unqualified proportion is deleted from the highest point X and the lowest point Y of all continuous values in sequence, and finally the set data proportion is reached; all process parameters are properly exchanged from head to tail, so that the 0 position always corresponds to the head of the finished cold-rolled steel strip product, and the 100% position always corresponds to the tail of the finished cold-rolled steel strip product; decision rules can be duplicated and mapped for similar users and purposes, freeing the product engineer from the labor of repeated work.
The invention has the beneficial effects that: through the full-flow quality control and grade score automatic judgment system, the judgment rules that special requirements of customers and all process parameters can be selected, different positions can be arranged in the head, the middle and the tail, and unqualified proportions are allowed can be set are met, the purpose of automatic blocking and degradation is achieved through a grade and score double-evaluation mode, the enthusiasm of staff can be excited according to the quantification of score values, the labor force of manual judgment is liberated, and finally the product quality control and the enterprise economic benefit are effectively improved.
Drawings
FIG. 1 is a flow chart of an automatic grading method of the present invention;
FIG. 2 is a schematic diagram of the rule for selecting data allowing unqualified ratio according to the present invention;
FIG. 3 is a schematic diagram of a decision rule for selecting a head-to-tail position for maintenance according to the present invention;
FIG. 4 is a parameter selection diagram according to an embodiment of the present invention;
FIG. 5 is a diagram of the determination rule set and grade specification parameters for steel making chemical composition C in accordance with an embodiment of the present invention;
FIG. 6 is a diagram showing the hot rolling coiling temperature determination rule and grade specification parameters according to the embodiment of the present invention;
FIG. 7 is a graph of annealing soaking temperature determination rules and grade specification parameters according to one embodiment of the present invention;
FIG. 8 is a diagram of exit width determination rules and profile parameters according to an embodiment of the present invention;
fig. 9 is a soaking temperature control determination graph according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for controlling the whole process quality and automatically judging the grade of a steel strip product comprises the following steps:
(1) automatic determination and setting: formulating delivery standards according to user requirements; the product engineer establishes a production and manufacturing standard based on the delivery standard; converting production process information according to component range requirements and product mechanical property requirements in production and manufacturing standards; if the user uses no special specification, the product is produced according to the production and manufacturing standard of the primary conversion, if the user uses special products, the special requirement or use is specified when ordering, and the product engineer further refines and converts the production process information according to the production and manufacturing standard of the primary conversion, and modifies the delivery standard;
(2) selecting an edited judgment item: based on the production and manufacturing standard, selecting parameters related to quality to participate in judgment, dividing the parameters participating in judgment into important parameters and unimportant parameters, modifying the weight of the parameters according to different special requirements of customers by a product engineer, finally judging a mode of grade + score double evaluation, wherein the grade is the lowest grade of the important parameters, blocking and degrading unqualified products, checking the parameters, influencing the parameters to carry out negative excitation on corresponding teams, and finally, the score is the sum of all the parameters;
(3) setting rules, forming a judgment rule by the production and manufacturing standard and production process information, wherein all parameters have single values and continuous values according to process characteristics, different rules can be set according to the head, the middle and the tail of the judgment continuous value parameters due to unstable rolling of the head and the tail, and meanwhile, the judgment rule of the allowable unqualified proportion of the continuous value parameters is reserved;
(4) putting the set rule into use, selecting a product for a period of time to perform simulation judgment, checking the use condition of the rule, revising the rule, circularly operating the step, and formulating a proper judgment rule;
(5) a product engineer can inquire the judgment results of all products under the rule and can also independently inquire according to the volume number;
(6) after the judgment is finished, the continuous value numerical value and the judgment curve are derived, and the judgment result is derived at the same time.
In the step (1), the user requirements comprise delivery date, product grade, thickness, tolerance, surface grade and oiling amount requirements proposed by a user; the delivery standard is to select proper national standard, enterprise standard or sign corresponding technical agreement according to the requirement of the user; the production and manufacturing standard establishes a proper process production route according to delivery standard, and comprises smelting, continuous casting, hot rolling, acid rolling, annealing and flattening process production processes; the production process information comprises the components of the continuous casting finished product, the hot rolling tapping temperature and the final rolling temperature.
In the step (2), the weight of each important parameter is A1、A2…AnThe unimportant parameter is weighted by B1、B2、…BmThe parameters satisfy the following conditions
A1+A2+…+An+B1+B2+Bm＝100％
Wherein n and m are the number of important parameters and unimportant parameters respectively;
the important parameters not only judge the grade but also judge the score, the grade is A, B, C, D, E, wherein the grade B is a manufacturing standard, the grade A product is well controlled strictly, the grade C is slightly worse, the grade D is a release standard, the release standard is obtained by statistical analysis of historical data, and the grade E which is lower than the release standard is unqualified; the score level A is a weighted value, the level B is an 80% weighted value, the level C is a 70% weighted value, the level D is a 60% weighted value, and the level E is a 40% weighted value; the non-important parameters are only scored, and the scoring rules are consistent with the important parameters.
In the step (3), the allowable unqualified proportion is deleted from the highest point X and the lowest point Y of all continuous values in sequence, and finally the set data proportion is reached; all process parameters are properly exchanged from head to tail, so that the 0 position always corresponds to the head of the finished cold-rolled steel strip product, and the 100% position always corresponds to the tail of the finished cold-rolled steel strip product; decision rules can be duplicated and mapped for similar users and purposes, freeing the product engineer from the labor of repeated work.
In practical application, the invention aims to provide an automatic judgment method for full-flow quality control and grade + score double evaluation of steel strip products.
The invention is characterized in that:
one of the features of the present invention is that the production standard may be converted according to the user's requirement. The product produced is characterized by special requirements of users.
Firstly, a user designates the brand of a steel strip product and designates an ordering standard.
(1) And converting the requirements such as width, thickness tolerance, flatness tolerance, surface quality, mechanical property requirements and the like according to standard requirements specified by a user.
(2) And converting process information of the production and manufacturing process, such as process control information of the components of the continuous casting finished product, hot rolling tapping temperature, final rolling temperature and the like, by a product engineer according to the component range requirement and the product mechanical property requirement in the standard.
(3) If the user's usage is not specified. The production is produced according to the above scheme, if the user product has special purpose, the special requirement or purpose is appointed when ordering, the product engineer needs to further refine and convert the production process information according to the product manufacturing standard of the primary conversion in (2), and at the same time, modify the delivery standard in (1).
According to the process, on one hand, the special requirements of the user are met, and on the other hand, when the product is subjected to factory judgment, the product is guaranteed to meet the special requirements of the user.
The invention makes delivery standard according to user's demand; establishing a production and manufacturing standard based on the delivery standard; and forming a judgment rule method according to the production standard and the production process.
The invention is characterized in that:
(1) the customer requirements of the invention include the delivery date, product grade, thickness, tolerance, surface grade, oil coating and other requirements set by the customer.
(2) The delivery standard is to select proper national standard, enterprise standard or sign corresponding technical agreement according to the customer requirements.
(3) The production and manufacturing standard establishes a proper process production route according to delivery standards, and comprises the working procedures of smelting, continuous casting, hot rolling, acid rolling, annealing, leveling and the like.
The three points are mutually related according to the judgment of a product engineer on the special requirements of a user and do not exist independently.
The invention has the following points:
the judgment rule is based on the production and manufacturing standard, and the parameters which are strongly related to the quality participate in the judgment. Dividing the parameters participating in the judgment into important parameters and unimportant parameters, wherein the weight of each important parameter is A1、A2…AnThe unimportant parameter is weighted by B1、B2、…BmThe parameters satisfy the following conditions.
A1+A2+…+An+B1+B2+Bm＝100％
Wherein n and m are the number of important parameters and unimportant parameters respectively.
The important parameters are judged to be grade and grade, the grade is A, B, C, D, E, the grade B is a manufacturing standard, the grade A product is well controlled strictly, the grade C is slightly worse, the grade D is a release standard, the release standard is obtained by statistical analysis of historical data, and the grade E which is lower than the release standard is unqualified. The scores are weight (level a), 80% weight (level B), 70% weight (level C), 60% weight (level D), 40% weight (level E). The non-important parameters are only scored, and the scoring rules are consistent with the important parameters. Some of the parameter decision rules and the rank weights are shown in table 1 below.
TABLE 1 partial parameter rating score decision rule
The invention point two is characterized in that: and a product engineer can modify the parameter weight according to different special requirements of customers, and finally judges the mode of grade + score double evaluation. The grade is the lowest grade of the important parameters, the unqualified products are blocked and degraded, and the parameters influencing the parameters are checked to carry out negative excitation on the corresponding team. The final score is the sum of all parameters, and the quantification of the score value can stimulate the enthusiasm of the staff. The grade + score double-evaluation mode can reduce unqualified flow direction customers, reduces the influence of manual judgment, and can effectively improve the product quality, thereby improving the product competitiveness of enterprises.
The invention point three:
all parameters have single values and continuous values according to process characteristics, different rules can be set according to the head, the middle and the tail when the continuous value parameters are judged due to unstable rolling of the head and the tail, and meanwhile, a judgment rule for allowing unqualified proportion to the continuous value parameters is reserved.
The allowable fail ratio is a data ratio obtained by deleting the maximum point X and the minimum point Y of all the continuous values in sequence and finally reaching the set value.
And all the process parameters are properly exchanged from head to tail, so that the 0 position always corresponds to the head of the finished cold-rolled steel strip product, and the 100% position always corresponds to the tail of the finished cold-rolled steel strip product.
The decision rule can be duplicated and mapped for similar users and purposes, and labor force of repeated work of product engineers is liberated.
TABLE 2 partial Process parameter decision rules
The third invention is characterized in that: a product engineer can freely select head, middle and tail, qualified proportion and important parameters when making rules according to special requirements of customers and production process parameter characteristics, and can judge whether the parameters are important parameters independently or in any combination.
Example (b): a certain user orders a standard Q/HG 032-2018 of a Handover Steel enterprise, a brand HC250IF, and a specification of 1.2 × 1163 mm.
The first step is that the information is converted into delivery standards according to user requirement information, the indexes of chemical components, mechanical properties and the like adopt enterprise standards Q/HG 032-containing 2018, the thickness tolerance adopts standard PT.A GB/T709-containing 2019 common precision, the width tolerance adopts standard PW.A GB/T709-containing 2019 common precision, and the thickness is adopted with slight negative tolerance according to the requirements of customers.
And the second step is to convert the information into production process information according to delivery standards. The yield strength required by the performance in the delivery standard is 250-360MPa, the tensile strength is more than or equal to 440MPa and the like, the Q/HG 032-2018 standard component requires that C is less than or equal to 0.008 percent, Si is less than or equal to 0.8 percent, Mn is less than or equal to 1.2 percent and the like, and in order to meet the user performance requirements, the components are strictly controlled to have the content of C less than or equal to 0.004 percent, the content of Si is 0.4-0.5 percent, the content of Mn is 0.6-0.8 percent and the like. The final rolling temperature target value of the hot rolling technological parameters is 910 ℃, the coiling temperature target value is 715 ℃ and the like. The target rolling reduction of the pickling and rolling parameters is set to be 66% and the like. The target value of the annealing parameter soaking temperature is 800 ℃, the target value of the slow cooling temperature is 650 ℃ and the like. The leveling parameter and the leveling elongation target value are positioned by 0.6 percent. The common width precision in the delivery standard is converted into the production process information, the required width target value is 1163-1167mm, and the common thickness precision in the delivery standard is converted into the production process information, the thickness target value is 1.14-1.26 mm.
Thirdly, as shown in fig. 4, parameters related to the product quality are selected according to the production process information for judgment, the smelting process comprises parameters such as converter end point oxygen, blowing supplement times, RH temperature rise oxygen blowing amount, standing time, decarburization end oxygen value, pure degassing time and the like and chemical components of each element, and the continuous casting process comprises parameters such as aluminum loss value, liquid level fluctuation, drawing speed and the like; the hot rolling procedure comprises parameters such as finish rolling outlet temperature, coiling temperature, finish rolling width, finish rolling thickness, convexity requirement, hot rolling laminar cooling mode and the like; the acid rolling comprises parameters such as reduction rate, withdrawal and straightening rate, rolling force, rolling speed and the like; the annealing process comprises parameters such as process section speed, heating section temperature, soaking section temperature, furnace tension and the like; the flattening process comprises parameters such as flattening elongation, rolling force and the like.
And fourthly, according to the importance degree of the parameters, a product engineer sets the parameters as important parameters and unimportant parameters, and according to the characteristics of the data, sets the parameters as whether to judge head, middle and tail, and sets allowable unqualified proportion according to continuous numerical values such as continuous annealing soaking temperature, cold rolling outlet thickness, outlet width and the like.
Chemical components, as shown in FIG. 5, the designed chemical component C is less than or equal to 0.004%, upper and lower limits and important parameters are set according to rules, and the chemical component values are not set in a head-to-tail and unqualified proportion. The actual values of the steel-making chemical components are judged according to the grades of A (0-0.0038%), B (0-0.004%), C (0-0.0042) and D (0-0.0044%) in sequence.
As shown in FIG. 6, the hot rolling coiling temperature is 715 + -17 deg.C, the upper and lower limits, important parameters, allowable failure rate 5%, and head and tail 30m are set according to the rules. The coiling temperature is judged according to rules set at different positions, and due to unstable rolling of the head and tail 30m, for example, the coiling temperature of the head and tail 30m is regulated to have a lower limit value 698+ 2% 34 (tolerance) of 698.68 ℃, an upper limit value 732-2% 34 of 731.32 ℃, and a B, C, D grade, wherein the values of 2% are changed to-10%, 22% and 34%, respectively; the band positions (698+ 10%. 34 ═ 701.4 ℃, 732-10%. 34 ═ 728.6 ℃), and B, C, D degrees changed the values 10% to 0%, -10%, -20%, respectively. And setting the unqualified proportion to be 5%, and deleting the abnormal points according to the rule from large to small according to the distance target value difference in the judgment process until the set proportion is reached.
As shown in fig. 7, the annealing soaking temperature target value is 800 ℃, and upper and lower limits, important parameters and allowable failure rate are set to 5% regularly. And when the judgment is carried out, deleting the abnormal points from large to small according to the rule until the target value difference reaches the set proportion, and judging the maximum values of all the residual actual values according to the grades of A (792-808 ℃), B (790-810 ℃), C (790-820 ℃) and D (790-825 ℃).
The width tolerance of the continuous annealing outlet adopts the common precision of standard PW.A GB/T709-2019, and the requirements are different according to different widths, for example, as shown in FIG. 8, the upper and lower limits, the important parameters, the allowable unqualified proportion is 5%, the grade D is the standard requirement, and the grades A, B, C are respectively 80%, 85% and 90% of the tolerance value. When the thickness is judged, allowable unqualified data is removed according to a set rule, and then the thickness is judged according to A, B, C, D grades in sequence.
And setting respective rules and specification parameters of all parameters according to the chemical composition C, the hot rolling coiling temperature, the annealing soaking temperature and the continuous exit width. After all parameters are set, the locking parameters automatically account for 80% of the total points according to the set important parameters and account for 20% of the total points according to the set unimportant parameters, as shown in fig. 4, the weights of the important parameters and the unimportant parameters are equally divided, and a product engineer can modify the weights according to requirements.
TABLE 3 partial Process parameter decision rule
And fifthly, putting the set rule into use, selecting a product for a period of time to perform simulation judgment, checking the use condition of the rule, revising the rule, and circularly operating the step to formulate a proper judgment rule.
And sixthly, the product engineer can inquire the judgment results of all products under the rule or can independently inquire according to the volume number. After the determination is finished, the product engineer can derive the continuous value numerical value and the determination curve, and derive the determination result at the same time.
Table 4 lists the partial series of values for continuous unwind reel No. L92000456001, including soaking temperature, exit thickness and exit width series of values process parameters.
TABLE 4 continuous annealing soaking temperature, outlet thickness, outlet width process parameters
Referring to fig. 9, the judgment curve is controlled under the reference of the volume number L92000456001, all the parameters are controlled within the range of class a, and the production control is good.
Table 5 lists the results of determination of products in three lots of contracts of 1.2 × 1163mm, L92000456001, L92000453202, and L92000454301.
TABLE 5 rating score determination
The control quality level of the whole flow of each roll can be known according to the finally judged grade, and meanwhile, the grade of each parameter can also show which parameters of each process are well controlled and which control needs to be improved, like the final judged grade is D due to the fact that the slow cooling control of the roll L92000453202 in the table is poor, and the final point value quantification can also stimulate the enthusiasm of staff.
Claims (4)
1. A method for controlling the whole process quality and automatically judging the grade of a steel strip product is characterized by comprising the following steps:
(1) automatic determination and setting: formulating delivery standards according to user requirements; the product engineer establishes a production and manufacturing standard based on the delivery standard; converting production process information according to component range requirements and product mechanical property requirements in production and manufacturing standards; if the user uses no special specification, the product is produced according to the production and manufacturing standard of the primary conversion, if the user uses special products, the special requirement or use is specified when ordering, and the product engineer further refines and converts the production process information according to the production and manufacturing standard of the primary conversion, and modifies the delivery standard;
(2) selecting an edited judgment item: selecting parameters related to quality to participate in judgment based on production and manufacturing standards;
(3) setting rules, forming a judgment rule by the production and manufacturing standard and production process information, wherein all parameters have single values and continuous values according to process characteristics, different rules can be set according to the head, the middle and the tail of the judgment continuous value parameters due to unstable rolling of the head and the tail, and meanwhile, the judgment rule of the allowable unqualified proportion of the continuous value parameters is reserved;
(4) putting the set rule into use, selecting a product for a period of time to perform simulation judgment, checking the use condition of the rule, revising the rule, and circularly operating the step;
(5) the judgment results of all products under the rule inquired by the product engineer can be independently inquired according to the volume number;
(6) after the judgment is finished, the continuous value numerical value and the judgment curve are derived, and the judgment result is derived at the same time.
2. The method of claim 1 for full process quality control and automatic grading of steel strip products, wherein the method comprises the following steps: in the step (1), the user requirements comprise delivery date, product grade, thickness, tolerance, surface grade and oiling amount requirements proposed by a user; the delivery standard is to select proper national standard, enterprise standard or sign corresponding technical agreement according to the requirement of user.
3. The method of claim 1 for full process quality control and automatic grading of steel strip products, wherein the method comprises the following steps: in the step (2), the weight of each important parameter is A1、A2…AnThe unimportant parameter is weighted by B1、B2、…BmThe parameters satisfy the following conditions
A1+A2+…+An+B1+B2+Bm=100%
Wherein n and m are the number of important parameters and unimportant parameters respectively;
the important parameters not only judge the grade but also judge the score, the grade is A, B, C, D, E, wherein the grade B is a manufacturing standard, the grade A product is well controlled strictly, the grade C is slightly worse, the grade D is a release standard, the release standard is obtained by statistical analysis of historical data, and the grade E which is lower than the release standard is unqualified; the score level A is a weighted value, the level B is an 80% weighted value, the level C is a 70% weighted value, the level D is a 60% weighted value, and the level E is a 40% weighted value; the non-important parameters are only scored, and the scoring rules are consistent with the important parameters.
4. The method of claim 1 for full process quality control and automatic grading of steel strip products, wherein the method comprises the following steps: in the step (3), the allowable unqualified proportion is deleted from the highest point X and the lowest point Y of all continuous values in sequence, and finally the set data proportion is reached; and (3) properly exchanging all process parameters from head to tail, ensuring that the 0 position always corresponds to the head of the finished cold-rolled steel strip product, and ensuring that the 100% position always corresponds to the tail of the finished cold-rolled steel strip product.
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