CN102019393B - Casting body quality judging method and device for continuous casting machine - Google Patents
Casting body quality judging method and device for continuous casting machine Download PDFInfo
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- CN102019393B CN102019393B CN2010106171566A CN201010617156A CN102019393B CN 102019393 B CN102019393 B CN 102019393B CN 2010106171566 A CN2010106171566 A CN 2010106171566A CN 201010617156 A CN201010617156 A CN 201010617156A CN 102019393 B CN102019393 B CN 102019393B
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Abstract
The invention provides a casting body quality judging method for a continuous casting machine. The method comprises the following steps of: calculating the trigger states of quality events based on the number of continuous casting processes and a pre-stored trigger formula; determining the current list of quality events based on the calculated trigger state of each quality event; for any casting body section, determining all quality events influencing the casting body section from the current list of quality events; dividing the casting body section into multiple sections which are influenced by different quality event sets and not intersected with each other based on all quality events influencing the casting body section; obtaining the quality event sets corresponding to the divided sections, and obtaining the corresponding defect occurrence by searching a rule base; and determining the quality judgment result of the casting body section based on the obtained defect occurrence corresponding to each section. Through the method, the quality of the casting body in casting stream state can be quickly and accurately pre-judged so as to instruct the continuous casting production process in real time.
Description
Technical field
The present invention relates to field of metallurgy.Specifically, relate to a kind of body of casting quality judging method and device that is used for conticaster.
Background technology
Along with template, banding pattern, the ratio of cast steel in the steel consumption structure significantly rise, the slab of One's name is legion, square billet, circle base and thin-slab caster constantly put into production.Fig. 1 is the sketch map of the slab caster in modern times.As shown in Figure 1; Modern blanket conticaster 10 generally includes the steel equipment that waters (tundish 2 of for example contain the ladle 1 of molten steel 20 usefulness, the molten steel hydrostatic pressing being controlled etc.), former (thereby for example molten steel is once cooled off the crystallizer 3 that forms casting stream 30a, usedly when casting stream 30a is carried out the secondary cooling many casting stream driven backing rolls 4 etc.) and cutting equipment (thereby whole castings streams that solidify that secondary cooling back forms are cut the flame cutting machine that forms strand 30b, be called for short fiery cutter 5 etc.).
In casting process, molten steel 20 is the casting stream 30a of molten steel through formation skin solidifies center behind 3 crystallisation by cooling of crystallizer, and pulls out from crystallizer end opening 3b from ladle 1 and the 3a entering crystallizer 3 suitable for reading of tundish 2 through crystallizer 3.After casting stream 30a pulls out from crystallizer end opening 3b, carry out the secondary cooling, the forcing that drives backing roll row 4 (note, only show a part of backing roll 4 among the figure) at casting stream simultaneously passed through a fixing passage down.Casting stream 30a is driving in the process of backing roll row 4 through casting stream, forms straightway 31, bending section 33, arc section 35, aligning section 37 and horizontal segment 39 successively.Flow through secondary cooling and inside and outside when all having solidified when casting, form strand 30b by fiery cutter 5 cuttings.Hereinafter, in needs, will cast stream 30a and strand 30b and be referred to as the body of casting.
In casting process; Steel quality (such as; Deoxidation situation, carbon content, manganese silicon ratio, manganese sulphur ratio, impurity etc.), process data (such as; Liquid steel temperature, molten steel liquid level, mould liquid level fluctuation, crystallizer electromagnetic agitation, mold oscillation parameter, once cooling and secondary cooling parameter, pulling rate, strand temperature, smoothing roll pressure etc.) and continuous casting installation for casting (such as; Crystallizer and secondary cooling apparatus etc.) variation all can exert an influence to the quality of casting stream 30a, thereby finally make strand 30b form defective, influence the quality of strand 30b.
The process data of each link that influences slab quality is gathered by the quality judging system of conticaster in casting process; Abnormal data is corresponded on the strand; Utilize the expert knowledge library of having set up to carry out analyzing and processing; And when the strand scale cuts, its quality is judged, thereby the flow direction of strand is provided suggestion.For example, to up-to-standard continuous casting billet, send with effectively its direct heat energy-conservation; To the defective continuous casting billet in surface, to after its off-line reconditioning cleaning again heating rolling to reduce the steel percent defective; The continuous casting billet serious to internal flaw directly declared it uselessly, no longer it further processed to save cost.
Can comprise three types through the slab quality defective that the quality judging system is judged: the internal soundness defective, surface quality defect is mingled with.The internal soundness defective comprises segregation, loose shrinkage cavity, centre burst, triangle crackle; Surface quality defect comprises surperficial lobe, surperficial transverse fissure, pattern cracking, surperficial slag inclusion and pore.The typical defect that current stage is mainly judged comprises surperficial lobe, surperficial transverse fissure, centre burst, middle crack etc.
External typical conticaster quality judging system comprises the Computer Aided Quality Control system (CAQC) of the crystallizer thermal monitoring system (MTM) and the VAI of British Steel Corporation.MTM utilizes the hot situation of thermocouple monitoring copper plate of crystallizer, the temperature signal that collects utilization expertise is analyzed, and then estimated the mass defect that possibly occur.CAQC judges through the technological parameter and the actual technological parameter that traces into that contrast in the online metallurgical database whether actual process parameter meets the requirements, thereby judges the credit rating of cutting strand.The emphasis of these two systems all is a quality of judging the strand after cutting; For the whereabouts of strand provides instruction, all be to judge therefore afterwards, it is fixed when not paying attention to strand still for casting stream the casting current mass to be provided anticipation; Thereby instruct continuous casting production in real time, to reduce the ratio of defective strand.
Summary of the invention
The present invention makes in order to solve the above-mentioned technical problem that exists in the prior art; Its purpose is to provide a kind of slab quality decision method and device that is used for conticaster; It is disconnected that requirement can be carried out anticipation to the quality that still is in the body of casting in the casting stream mode rapidly and accurately; And instruct continuous casting manufacturing technique during according to the disconnected fructufy of anticipation, and requirement can provide prioritization scheme to the strand cutting, thus guarantee to produce the ratio that carries out and reduce the defective strand smoothly.
According to an aspect of the present invention, a kind of body of casting quality judging method that is used for conticaster is provided, body of casting quality judging method can comprise: the process data to casting process is sampled; Based on the process data that is sampled and the triggering formula of each quality incident of storage in advance, calculate the triggering state of each quality incident; Triggering state based on each quality incident that is calculated; Definite current effective mass list of thing that the quality of the body of casting is exerted an influence; Wherein, The coordinate of the body of casting section that the quality incident that storage exerts an influence to the body of casting before cutting in the said effective mass list of thing and this quality incident exert an influence is interval, and does not occur simultaneously each other in the body of casting interval that the similar quality incident in the said effective mass list of thing is influenced; To any body of casting section of the said body of casting, from the said current effective mass list of thing that the quality of the body of casting is exerted an influence, confirm all quality incidents that this body of casting section is exerted an influence; Based on all quality incidents that this body of casting section is exerted an influence of being determined; This body of casting section is divided into a plurality of sections that do not have common factor each other; Wherein, For any said section that is marked off, the each several part of the section that this quilt marks off is influenced by identical quality event sets all, and the quality event sets that the section that this quilt is marked off exerts an influence is different with the quality event sets that another section that is marked off is exerted an influence; To each section that is marked off; Obtain the quality event sets that the quality to this section exerts an influence; And obtain and the corresponding defective incidence of this quality set through the rule base of searching storage in advance; Thereby obtain the defective incidence corresponding, comprise the rule that has defined with the corresponding body of casting defective of quality event sets incidence in the wherein said rule base with this section; And, confirm the quality judging result of said body of casting section based on the defective incidence corresponding that is obtained with each section.
Preferably; Saidly confirm that the step of the current effective mass list of thing that the quality to the body of casting exerts an influence can comprise:, calculate body of casting section that this quality incident influenced starting point coordinate and terminal point coordinate with respect to a fixing point on the said body of casting to showing each the quality incident that is triggered by the triggering state that is calculated; And for show each the quality incident that is triggered by the triggering state that is calculated; The coordinate of the body of casting section that is influenced based on this quality incident; With the coordinate of this body of casting section interval with previously stored effective mass list of thing in the coordinate block information of the body of casting section that is influenced about similar quality incident that comprises compare; To confirm current effective mass list of thing; If wherein the coordinate of the body of casting section that influenced of this quality incident interval with previously stored similar quality incident in the interval common factor that exists of coordinate of the body of casting section that influenced of a similar quality incident; It is interval that the interval union of coordinate of then getting these two body of casting sections substitutes the coordinate of the body of casting section that this similar quality incident in the previously stored effective mass list of thing influenced; The coordinate of the body of casting section that is influenced as similar quality incident of this quality incident and this is interval; Thereby obtain current effective mass list of thing; And if the coordinate of the body of casting section that influenced of this quality incident interval with previously stored effective mass list of thing in similar quality incident in the coordinate interval of the body of casting section that influenced of any similar quality incident all do not have common factor; Add in the previously stored effective mass list of thing in the coordinate interval of the body of casting section that then this quality incident and this quality incident is influenced, thereby obtain current effective mass list of thing.
Preferably, said quality judging result can be one of in qualified, suspicious and defective.
Preferably; When detecting fire and cut signal; Can confirm the quality judging result of the current predetermined body of casting section that is cut; And confirm not the quality judging result of the body of casting section of another predetermined length adjacent through fiery cutter cleavage with the current predetermined body of casting section that is cut, if the quality judged result of the current predetermined body of casting section that is cut is different with the quality judged result of the body of casting section of this another predetermined length, then cut the said current strand section that is cut of being scheduled to.
Preferably; When detecting fire and cut signal; Can confirm the quality judging result of the current predetermined body of casting section that is cut; And confirm not the quality judging result of the body of casting section of another predetermined length adjacent through fiery cutter cleavage with the current predetermined body of casting section that is cut; If the quality judged result of the quality judged result of the current predetermined body of casting section that is cut and the body of casting section of this another predetermined length all is defective, then can this current predetermined body of casting section that is cut not be cut, and these two body of casting sections are merged into a body of casting section.
According to a further aspect in the invention, a kind of body of casting quality judging device that is used for conticaster is provided, this body of casting quality judging device can comprise: sampling unit is used for the process data of casting process is sampled; First computing unit is used for calculating the triggering state of each quality incident based on the process data that is sampled and the triggering formula of each quality incident of storage in advance; First confirms the unit; Be used for triggering state based on each quality incident that is calculated; Definite current effective mass list of thing that the quality of the body of casting is exerted an influence; Wherein, the coordinate of the body of casting section that the quality incident that storage exerts an influence to the body of casting before cutting in the said effective mass list of thing and this quality incident exert an influence is interval, and does not occur simultaneously each other in the body of casting interval that the similar quality incident in the said effective mass list of thing is influenced; Second confirms the unit, is used for any body of casting section to the said body of casting, from the said current effective mass list of thing that the quality of the body of casting is exerted an influence, confirms all quality incidents that this body of casting section is exerted an influence; Division unit; Based on all quality incidents that this body of casting section is exerted an influence of being determined; This body of casting section is divided into a plurality of sections that do not have common factor each other, wherein, for any said section that is marked off; The each several part of the section that this quilt marks off is influenced by identical quality event sets all, and the quality event sets that the section that this quilt is marked off exerts an influence is different with the quality event sets that another section that is marked off is exerted an influence; Acquiring unit; Be used to be directed against each section that is marked off; Obtain the quality event sets that the quality to this section exerts an influence; And obtain and the corresponding defective incidence of this quality set through the rule base of searching storage in advance, thereby obtain the defective incidence corresponding, comprise the rule that has defined with the corresponding body of casting defective of quality event sets incidence in the wherein said rule base with this section; The 3rd confirms the unit, is used for confirming the quality judging result of said body of casting section based on the defective incidence corresponding with each section that is obtained.
Preferably; Said first confirms that the unit can comprise: second computing unit; Be used for to showing each the quality incident that is triggered, calculate body of casting section that this quality incident influenced starting point coordinate and terminal point coordinate with respect to a fixing point on the said body of casting by the triggering state that is calculated; And the 4th confirm the unit; Be used for for show each the quality incident that is triggered by the triggering state that is calculated; The coordinate of the body of casting section that is influenced based on this quality incident; With the coordinate of this body of casting section interval with previously stored effective mass list of thing in the coordinate block information of the body of casting section that is influenced about similar quality incident that comprises compare; To confirm current effective mass list of thing; If wherein the coordinate of the body of casting section that influenced of this quality incident interval with previously stored similar quality incident in the interval common factor that exists of coordinate of the body of casting section that influenced of a similar quality incident; Then the 4th to confirm that the coordinate that the interval union of coordinate of these two body of casting sections substitutes the body of casting section that this similar quality incident in the previously stored effective mass list of thing influenced is got in the unit interval; The coordinate of the body of casting section that is influenced as similar quality incident of this quality incident and this is interval; Thereby obtain current effective mass list of thing; And if the coordinate of the body of casting section that influenced of this quality incident interval with previously stored effective mass list of thing in similar quality incident in the coordinate interval of the body of casting section that influenced of any similar quality incident all not have common factor, then add in the previously stored effective mass list of thing in the coordinate interval of the 4th definite unit body of casting section that this quality incident and this quality incident are influenced, thereby obtain current effective mass list of thing.
Preferably; The said body of casting quality judging device that is used for conticaster can also comprise: the 5th confirms the unit; Be used for quality judging result, determine whether to cut the current predetermined body of casting section that is cut according to the body of casting section of the quality judging result of the current predetermined body of casting section that is cut and adjacent another predetermined length.When detecting fire and cut signal; The quality judging result of the current predetermined body of casting section that is cut is confirmed in the 3rd definite unit; And confirm not the quality judging result of the body of casting section of another predetermined length adjacent through fiery cutter cleavage with the current predetermined body of casting section that is cut; If the quality judged result of the current predetermined body of casting section that is cut is different with the quality judged result of the body of casting section of this another predetermined length; Then the 5th confirms the said current predetermined strand section that is cut of the definite cutting in unit; If the quality judged result of the quality judged result of the current predetermined body of casting section that is cut and the body of casting section of this another predetermined length all is defective, then the 5th definite unit is confirmed this current predetermined body of casting section that is cut not to be cut, and these two body of casting sections are merged into a body of casting section.
Preferably; The described body of casting quality judging device that is used for conticaster can also comprise: memory cell; Be used to store triggering formula, effective mass incident the current list and the rule base of each quality incident, wherein, comprise the coordinate block information of the body of casting section that is influenced about the quality incident in the said effective mass list of thing; The i.e. starting point coordinate of this body of casting section and terminal point coordinate comprise the rule of correspondence of quality event sets and body of casting defective incidence in the said rule base.
In order to realize above-mentioned and relevant purpose, one or more aspects of the present invention comprise the characteristic that the back will specify and in claim, particularly point out.Following explanation and accompanying drawing have specified some illustrative aspects of the present invention.Yet, the indication of these aspects only be some modes that can use in the variety of way of principle of the present invention.In addition, the present invention is intended to comprise all these aspects and their equivalent.
Description of drawings
Below in conjunction with the explanation of accompanying drawing and the content of claims, other purpose of the present invention and result will understand and should be readily appreciated that more through reference.In the accompanying drawings:
Fig. 1 is the sketch map of the slab caster in modern times;
Fig. 2 shows the flow chart that is used for the body of casting quality judging step of conticaster of the present invention;
Fig. 3 shows the flow chart of the computational process of a described triggering state of example of the present invention;
Fig. 4 a-4b shows the sketch map of definite method of the current list of the quality incident that the quality of the body of casting is exerted an influence of the present invention;
Fig. 5 shows in the body of casting quality judging method of the present invention the sketch map of the method for this any body of casting section being divided according to all quality incidents that any body of casting section is exerted an influence; And
Fig. 6 shows the block diagram that is used for the body of casting quality judging device of conticaster of the present invention.
Identical label is indicated similar or corresponding feature or function in institute's drawings attached.
The specific embodiment
In the following description, for purposes of illustration,, many details have been set forth for the complete understanding to one or more embodiment is provided.Yet, clearly, can not have to realize these embodiment under the situation of these details yet.In other example, for the ease of describing one or more embodiment, known structure and equipment illustrate with the form of block diagram.
Come below with reference to accompanying drawings each embodiment according to the present invention is described in detail.
In order to express easily, in the following description, the cast steel of bending that will be from crystallizer 3a suitable for reading to fiery cutter cleavage 5a is expressed as straight cast steel equivalently.Cast steel from crystallizer 3a suitable for reading to fiery cutter cleavage 5a is called casting stream; Its core still is a molten steel to casting stream at crystallizer 3a suitable for reading place; And to fiery cutter cleavage 5a place solidified fully and suitable cutting, the length L of casting stream is confirmed conticaster.Whether the cast steel that will pass through fiery cutter cleavage 5a is called strand, no matter cut.It is end to end that the strand that cut of hypothesis remains piece simultaneously.In addition, for convenience of explanation for the purpose of, in needs, will cast stream and strand be referred to as the body of casting.Being unfavorable for of occurring in the casting process cast the incident (such as process data unusual) that stream solidifies and influence easily the moulding slab quality be called the quality incident.The characteristic of a quality incident comprises triggering attribute, location attribute and the quantitative attributes of this quality incident.Triggering attribute is exactly a triggering formula for this quality event numbering, brings the current process data value that collects into the triggering formula through the Formula Parsing module, is judged the triggering state of this quality incident by result of calculation.Coverage when the location attribute is used for confirming this quality incident generation; Mainly comprise two parameters; Be quality event offset amount Bias and quality events affecting length A fflen; Wherein, quality event offset amount Bias is meant the starting point QEB of coverage of quality incident apart from the length value of fiery cutter cleavage 5a, and quality events affecting length A fflen is meant terminal point QEE and the length between the starting point QEB of the coverage of said quality incident.The defect type and the defect level of the casting stream defective that quantitative attributes is used for confirming that this quality incident can produce; Three kinds of defect types have been defined in the present invention; Be blemish, internal flaw and inclusion defect, the quantitative attributes of quality incident just is meant the probability of happening of these three kinds of defectives.
Fig. 2 shows the flow chart that is used for the body of casting quality judging method of conticaster according to of the present invention.
As shown in Figure 2, at first, in step S210, process data to be sampled through sampling unit, said process data for example is { v, Q
m, m=1,2,3...}, wherein v is a pulling rate, Q
mBe in other procedure parameter (such as, the electric current of the flow of the flow of mold oscillation parameter, primary cooling water and hydraulic pressure, secondary cooling water and hydraulic pressure, driven roller, gently depress, strand temperature etc.).In addition, preferably, can also the process data that collect be stored in the memory cell, for using in the future.
After the procurement process data, in step S220,, calculate the triggering state of each quality incident based on the process data that is sampled and the triggering formula of each quality incident of storage in advance.For example, can be as shown in Figure 3, at step S310, quality Event triggered formula pointer P=1 is set earlier, this pointer P=1 points to quality Event triggered formula sequence { fn, the n=1,2,3 that prestores ... In first quality Event triggered formula.Then, at step S320, the process data substitution pointer P quality Event triggered formula pointed with being obtained calculates its trigger value.Then, at step S330,, judge whether corresponding quality incident is triggered according to the trigger value that is calculated.Be triggered if be judged as said quality incident, the quality incident that then record is triggered in step S340, process proceeds to step S350 then.Be not triggered if be judged as said quality incident, then process advances to step S350.At step S350, judge whether to accomplish said process to all quality incidents.If accomplish said process to all quality incidents, then said process finishes.Otherwise, proceed to step S360.At S360, current pointer P is added 1, then, repeat the process from S320 to S350, till accomplishing the triggering state computation to all quality incidents to this pointer triggering formula pointed that adds after 1.In the replacement instance, also can not adopt said process, trigger in formula and calculate but the process data that is sampled is updated to all simultaneously, thereby obtain triggering state to all quality incidents.
After calculating the triggering state of each quality incident; In step S230; Triggering state based on each quality incident that is calculated; Definite current effective mass list of thing that the quality of the body of casting is exerted an influence; The coordinate of the body of casting section that the quality incident that storage exerts an influence to the body of casting before cutting in the said effective mass list of thing and this quality incident exert an influence is interval, and does not occur simultaneously each other in the body of casting interval that the similar quality incident in the said effective mass list of thing is influenced.For this reason, at first be directed against calculated show each the quality incident that is triggered by the triggering state, calculate body of casting section that this quality incident influenced starting point coordinate and terminal point coordinate with respect to a fixing point on the said body of casting.
Computational process about starting point coordinate and terminal point coordinate can for example be described below.In the example below, establish from t=0 and begin constantly process data (for example, the electric current of the flow of pulling rate, secondary cooling water and hydraulic pressure, driven roller, gently depress etc.) is sampled, the sampling period is T (for example, T=1 second).Length to the body of casting adds up, and the cumulative length of the body of casting (the length OA of the body of casting of promptly counting from crystallizer 3a suitable for reading) is stored.The cumulative length of the body of casting can obtain through casting stream encoder reading or through the integration of pulling rate to the time, is to obtain through the integration of pulling rate to the time in the present invention.
Suppose that said fixing point for example is the head end of the body of casting of pulling out from crystallizer.When calculating when quality incident QE has taken place,, can obtain event offset amount Bias and the events affecting length A fflen of quality incident QE according to the quality affair character that prestores.Then, the starting point of the casting stream that influenced of calculated mass incident QE and terminal point are with respect to the distance (following starting point coordinate and the terminal point coordinate of being called respectively) of body of casting head end A.The starting point coordinate and the terminal point coordinate of the casting stream that quality incident QE is influenced calculate with formula OA-L+Bias and OA-L+Bias+Afflen respectively.
Then; For show each the quality incident that is triggered by the triggering state that is calculated; The coordinate of the body of casting section that is influenced based on this quality incident; With the coordinate of this body of casting section interval with previously stored effective mass list of thing in the coordinate block information of the body of casting section that is influenced about similar quality incident that comprises compare; To confirm current effective mass list of thing; If wherein the coordinate of the body of casting section that influenced of this quality incident interval with previously stored similar quality incident in the interval common factor that exists of coordinate of the body of casting section that influenced of a similar quality incident; It is interval that the interval union of coordinate of then getting these two body of casting sections substitutes the coordinate of the body of casting section that this similar quality incident in the previously stored effective mass list of thing influenced; The coordinate of the body of casting section that is influenced as similar quality incident of this quality incident and this is interval; Thereby obtain current effective mass list of thing; And if the coordinate of the body of casting section that influenced of this quality incident interval with previously stored effective mass list of thing in similar quality incident in the coordinate interval of the body of casting section that influenced of any similar quality incident all do not have common factor, add in the previously stored effective mass list of thing in the coordinate interval of the body of casting section that then this quality incident and this quality incident is influenced, thereby obtain current effective mass list of thing.About above-mentioned triggering state based on each quality incident that is calculated; Confirm the process of the current effective mass list of thing that the quality to the body of casting exerts an influence; In agency's file number that the applicant submits to simultaneously is the application of PA101247NNI, provided specific descriptions, introduced in full in this content with this application.
Specifically, Fig. 4 a-4b shows definite method of the current effective mass list of thing that the quality of the body of casting is exerted an influence of the present invention.In the following description, the quality incident is designated as " quality event type [starting point coordinate of the body of casting section that this quality incident is influenced, the terminal point coordinate of the body of casting section that this quality incident is influenced] ".The coordinate of the casting stream that the type label id of recording quality incident, this quality incident are influenced in the effective mass list of thing is interval, i.e. starting point coordinate and terminal point coordinate.
Shown in Fig. 4 a, when establishing quality incident QE1 [G, H] generation, comprise the quality incident QE1 [C, D] and the QE1 [E of storage in advance in the effective mass list of thing; F], they are similar quality incidents, wherein, quality incident QE1 [G, H] and quality incident QE1 [C; D] coordinate interval [G, H] and [C, the D] of the body of casting section that influenced do not occur simultaneously, and quality incident QE1 [G; H] then there is common factor in the coordinate interval [G, H] of the body of casting section that influenced with quality incident QE1 [E, F] with [E, F].So, quality incident QE1 [G, H] and quality incident QE1 [E, F] are merged into QE1 [E, H], substitute previously stored quality incident QE [E, F].Because the interval [G of the coordinate of the body of casting section that quality incident QE1 [G, H] and quality incident QE1 [C, D] are influenced; H] do not occur simultaneously with [C, D], therefore; Quality incident QE1 [C, D] still is retained in the effective mass list of thing, so just obtains current effective mass list of thing; Wherein comprise quality incident QE1 [E, H] and QE1 [C, D].Do not occur simultaneously each other in the body of casting interval that similar quality incident in this current effective mass list of thing is influenced.
And for example shown in Fig. 4 b, when establishing quality incident QE1 [G, H] generation, comprise the quality incident QE1 [C, D] and the QE2 [I, J] of storage in advance in the effective mass list of thing, QE1 [C, D] and QE2 [I, J] are inhomogeneity quality incidents.Wherein, quality incident QE1 [G, H] and quality incident QE1 [C; D] coordinate interval [G, H] and [C, the D] of the body of casting section that influenced do not occur simultaneously; Therefore, quality incident QE1 [G, H] is added in the effective mass list of thing; Simultaneously, quality incident QE1 [C, D] still is retained in the effective mass list of thing.At this moment, because quality incident QE1 [G, H] and QE2 [I; J] be inhomogeneity quality incident, so, no matter whether the coordinate interval of the body of casting section that they influenced has common factor (in Fig. 2 b; Both have common factor), quality incident QE2 [I, J] still is retained in the effective mass list of thing.So just obtain current effective mass list of thing, wherein comprise quality incident QE1 [C, D], QE1 [G, H] and QE2 [I, J].Do not occur simultaneously each other in the body of casting interval that similar quality incident in this effective mass incident the current list is influenced.Should be noted that in this case inhomogeneous quality incident QE1 [G; H] and coordinate interval [G, H] and [I of the body of casting section that influenced respectively of QE2 [I, J]; J] common factor [G; J] pairing body of casting section received the common influence of quality incident QE1 and QE2, therefore it title received quality event sets { QE1, the influence of QE2}.
After the current effective mass list of thing that the quality of having confirmed the body of casting exerts an influence; In step S240 shown in Figure 2; To any body of casting section of the said body of casting, from the said current effective mass list of thing that the quality of the body of casting is exerted an influence, confirm all quality incidents that this body of casting section is exerted an influence.Specifically, on the said body of casting, confirm one section body of casting section arbitrarily, this body of casting section can be through one section body of casting section before the fiery cutter, also can be through one section body of casting section after the fiery cutter.With the coordinate of this any body of casting section interval with current effective mass list of thing in the coordinate interval of the body of casting section that influenced of each quality incident compare respectively.Do not occur simultaneously if the interval coordinate with this any body of casting section of the coordinate of the body of casting section that a quality incident in effective mass incident the current list is influenced is interval, then this quality incident is to the not influence of this any body of casting section.If the interval common factor that exists of the interval coordinate with this any body of casting section of the coordinate of the body of casting section that a quality incident in the current effective mass list of thing is influenced, then this quality incident has produced influence to this any body of casting section.Confirm all quality incidents that this any body of casting section is exerted an influence in the current effective mass list of thing.
Then; In step S250 shown in Figure 2,, this body of casting section is divided into a plurality of sections that do not have common factor each other based on all quality incidents that this body of casting section is exerted an influence of being determined; Wherein, For any said section that is marked off, the each several part of the section that this quilt marks off is influenced by identical quality event sets all, and the quality event sets that the section that this quilt is marked off exerts an influence is different with the quality event sets that another section that is marked off is exerted an influence.The specific operation process of this step is described with reference to figure 5 below.
Fig. 5 shows in the body of casting quality judging method of the present invention the sketch map of the method for this any body of casting section being divided according to all quality incidents that any body of casting section is exerted an influence.
As shown in Figure 5, suppose that the coordinate interval of said any body of casting section is [X, Y], all quality incidents that this any body of casting section [X, Y] is exerted an influence comprise QE1 [Q, T], QE2 [R, U] and QE3 [S, V] in effective mass incident the current list.Based on above-mentioned quality incident QE1 [Q, T], QE2 [R, U] and the QE3 [S that this any body of casting section [X, Y] is exerted an influence; V], this body of casting section [X, Y] is divided into section [X, Q], [Q that does not have common factor each other; R], [R, S], [S, T], [T, U] and [U; Y], wherein, the each several part of each section in these sections all receives the influence of equal in quality event sets, and influences the quality event sets difference of the segments of different in these sections.Specifically, for example, the quality event sets that section [X, Q] is exerted an influence is empty set Φ, to section [Q; R] the quality event sets that exerts an influence for QE1}, and the quality event sets that section [R, S] is exerted an influence for QE1, QE2} is to section [S; T] the quality event sets that exerts an influence is for { QE3} is to section [T for QE1, QE2; U] the quality event sets that exerts an influence is { QE2, QE3}, and the quality event sets that section [U, Y] is exerted an influence is { QE3}.From on can find out that the pairing quality event sets of any two body of casting sections after the above-mentioned division is all inequality, and the quality event sets that any part in above-mentioned any body of casting section is exerted an influence is all identical.
Then; In step S260 shown in Figure 2; To each section that is marked off, obtain the quality event sets that the quality to this section exerts an influence, and obtain to gather corresponding defective incidence with this quality through the rule base of searching storage in advance; Thereby obtain the defective incidence corresponding, comprise the rule that has defined with the corresponding body of casting defective of quality event sets incidence in the wherein said rule base with this section.Specifically, in situation shown in Figure 5, the section that said any body of casting section [X, Y] is marked off is [X; Q], [Q, R], [R, S], [S, T], [T; U] and [U, Y], the quality event sets that these sections are exerted an influence is respectively Φ, { QE1}, { QE1, QE2}, { QE1; QE2, QE3}, { QE2, QE3} and { QE3}.In the rule base of storage in advance, different quality event sets has been defined defective incidence corresponding with it.Wherein, for some quality event sets, can define specific defective incidence for it, and, then calculate its pairing defective incidence through the pairing defective incidence of other quality event sets for other quality event sets.For example, rule base can define quality event sets Φ, { QE1}, { QE2}, { QE3} is with { the pairing defective incidence of QE3} is respectively 0 for QE1, QE2, W
1, W
2, W
3, and W
123, { QE1, QE2} is with { QE2, the defective incidence of QE3} is respectively W and define the quality event sets
1+ W
2And W
2+ W
3So, said any body of casting section [X, Y] by the defective incidence of the section [X, Q] that marked off, [Q, R], [R, S], [S, T], [T, U] and [U, Y] just be defined as 0 respectively, W1, W
1+ W
2, W
123, W
2+ W
3, and W
3
After the corresponding defective incidence of said section that the quilt that obtains with said any body of casting section marks off, in step S270 shown in Figure 2,, confirm the quality judging result of said body of casting section based on the defective incidence corresponding that is obtained with each section.For example; The greatest drawback incidence that rule base can define in the defective incidence of the said section that the quilt of said any body of casting section marks off is the defective incidence of said any body of casting section; And definition is when the defective incidence of said any body of casting section during less than first threshold; Said any body of casting section up-to-standard, when the defective incidence of said any body of casting section greater than first threshold during less than second threshold value, the quality of said any body of casting section is suspicious; When the defective incidence of said any body of casting section during greater than second threshold value, said any body of casting section off quality.
Because body of casting quality judging method of the present invention has adopted accurately (error is no more than 1cm) and the quality incident and the body of casting section localization method of (in 0.5 second) fast; Therefore; It is disconnected to carry out anticipation to the quality that still is in the body of casting in the casting stream mode; And instruct continuous casting manufacturing technique during according to the disconnected fructufy of anticipation, thereby guarantee to produce the ratio that carries out and reduce the defective strand smoothly.
In addition, in one or more preferred embodiments,, when detecting fire and cut signal, can be optimized body of casting cutting scheme, with the ratio of further reduction defective strand according to the quality judging method of the body of casting fast and accurately of the present invention.Specifically; When detecting fire and cut signal; Can confirm the quality judging result of the current predetermined body of casting section that is cut according to above-mentioned body of casting quality judging method, and confirm not the quality judging result of the body of casting section of another predetermined length adjacent through fiery cutter cleavage with the current predetermined body of casting section that is cut.Said predetermined length for example can be to carry out the scale cut lengths in when cutting, when carrying out non-scale cutting, can be the length of any appointment perhaps.If the quality judged result of the current predetermined body of casting section that is cut is different with the quality judged result of the body of casting section of said another predetermined length, then cut the said current predetermined strand section that is cut.If it is qualified that above-mentioned two body of casting sections all are judged as, then when scale cuts, perhaps when carrying out the cutting of non-scale, can cut as required or not cut.And if the quality judged result of the body of casting section of the quality judged result of the current predetermined body of casting section that is cut and this another predetermined length all is defective; Then this current predetermined body of casting section that is cut is not cut, and these two body of casting sections are merged into a body of casting section.For example, when cutting, if the quality judged result of the current predetermined body of casting section that is cut is qualified; And the quality judged result of the body of casting section of said another predetermined length is defective; The cutting of then being scheduled to, the strand section that can obtain being scheduled to like this, vice versa.And if the quality judged result of the body of casting section of the quality judged result of the current predetermined body of casting section that is cut and said another predetermined length is when defective; Then can these two sections underproof body of casting sections be merged the back cutting; So just can the body of casting with quality problems be concentrated on the block casting base as far as possible, be convenient to focus on.
As above the body of casting quality judging method that is used for conticaster of the present invention has been described referring to figs. 1 through Fig. 5.The body of casting quality judging method that is used for conticaster of the present invention can adopt software to realize, also can adopt hardware to realize, or adopts the mode of software and hardware combination to realize.
Fig. 6 shows the block diagram that is used for the body of casting quality judging device of conticaster of the present invention.
As shown in Figure 6, the body of casting quality judging device 600 that is used for conticaster of the present invention comprises sampling unit 610,630, second definite unit 640, first computing unit, 620, first definite unit, division unit 650, acquiring unit 660 and the 3rd definite unit 670.
After calculating the triggering state of each quality incident; First confirms the triggering state of unit 630 based on each quality incident that is calculated; Definite current effective mass list of thing that the quality of the body of casting is exerted an influence; Wherein, The coordinate of the body of casting section that the quality incident that storage exerts an influence to the body of casting before cutting in the said effective mass list of thing and this quality incident exert an influence is interval, and does not occur simultaneously each other in the body of casting interval that the similar quality incident in the said effective mass list of thing is influenced.
To any body of casting section of the said body of casting, second confirms that unit 640 confirms all quality incidents that this body of casting section is exerted an influence from the said current effective mass list of thing that the quality of the body of casting is exerted an influence.Division unit 650 is based on all quality incidents that this body of casting section is exerted an influence of being determined; This body of casting section is divided into a plurality of sections that do not have common factor each other; Wherein, For any said section that is marked off, the each several part of the section that this quilt marks off is influenced by identical quality event sets all, and the quality event sets that the section that this quilt is marked off exerts an influence is different with the quality event sets that another section that is marked off is exerted an influence.
To each section that is marked off; Acquiring unit 660 obtains the quality event sets that the quality to this section exerts an influence; And obtain and the corresponding defective incidence of this quality set through the rule base of searching storage in advance, thereby obtain the defective incidence corresponding with this section.The quality judging result of said body of casting section is confirmed based on the defective incidence corresponding with each section that is obtained in the 3rd definite unit 670.
In a preferred embodiment, first confirms that unit 630 comprises that also the second computing unit 630a and the 4th confirms unit 630b.The second computing unit 630a is to showing each the quality incident that is triggered by the triggering state that is calculated, and calculates body of casting section that this quality incident influenced starting point coordinate and the terminal point coordinate with respect to a fixing point on the said body of casting.The 4th confirms that unit 630b is for shown each the quality incident that is triggered by the triggering state that is calculated; The coordinate of the body of casting section that is influenced based on this quality incident; With the coordinate of this body of casting section interval with previously stored effective mass list of thing in the coordinate block information of the body of casting section that is influenced about similar quality incident that comprises compare; To confirm current effective mass list of thing; Wherein, If the coordinate of the body of casting section that this quality incident is influenced interval with previously stored similar quality incident in the interval common factor that exists of coordinate of the body of casting section that influenced of a similar quality incident; Then the 4th to confirm that the interval union of coordinate that unit 630b gets these two body of casting sections substitutes the coordinate of the body of casting section that this similar quality incident in the previously stored effective mass list of thing influenced interval; The coordinate of the body of casting section that is influenced as similar quality incident of this quality incident and this is interval; Thereby obtain current effective mass list of thing; And if the coordinate of the body of casting section that influenced of this quality incident interval with previously stored effective mass list of thing in similar quality incident in the coordinate interval of the body of casting section that influenced of any similar quality incident all not have common factor, then add in the previously stored effective mass list of thing in the coordinate interval of the 4th definite unit 630b body of casting section that this quality incident and this quality incident are influenced, thereby obtain current effective mass list of thing.
In a further advantageous embodiment, the body of casting quality judging device 600 that is used for conticaster of the present invention comprises that also the 5th confirms unit 680.When detecting fire and cut signal; The said the 3rd confirms the quality judging result of unit 670 definite current predetermined body of casting sections that are cut; And confirm not the quality judging result of the body of casting section of another predetermined length adjacent through fiery cutter cleavage with the current predetermined body of casting section that is cut; The 5th confirms the quality judging result of unit 680 according to the body of casting section of the quality judging result of the current predetermined body of casting section that is cut and adjacent another predetermined length, determines whether to cut the current predetermined body of casting section that is cut.
If the quality judged result of the current predetermined body of casting section that is cut is different with the quality judged result of the body of casting section of this another predetermined length, then the 5th confirms the said current predetermined strand section that is cut of unit 680 definite cuttings.If the quality judged result of the quality judged result of the current predetermined body of casting section that is cut and the body of casting section of this another predetermined length all is defective; Then the 5th definite unit 680 is confirmed this current predetermined body of casting section that is cut not to be cut, and these two body of casting sections are merged into a body of casting section.
In addition; If it is qualified that above-mentioned two body of casting sections all are judged as; Then under the situation of carrying out the scale cutting; The said the 5th definite unit 680 is confirmed this current predetermined body of casting section that is cut is cut, and perhaps under the situation of carrying out non-scale cutting, the said the 5th definite unit 680 can be confirmed this current body of casting section of being scheduled to be cut is cut or do not cut as required.
In addition, preferably, said body of casting quality judging device 600 can also comprise the memory cell (not shown), is used to store triggering formula, effective mass list of thing and the rule base of each quality incident.Wherein, comprise the coordinate block information of the body of casting section that is influenced about the quality incident in the said effective mass list of thing, i.e. the starting point coordinate of this body of casting section and terminal point coordinate.The rule of correspondence that comprises quality event sets and body of casting defective incidence in the said rule base.
Adopt above-mentioned body of casting quality judging method and the device that is used for conticaster, can reduce the ratio of defective strand in the continuous casting production process greatly.After using this method and apparatus on the conticaster of certain steel mill, the casting blank defect ratio is reduced to present 0.02% by former 0.12%, and economic benefit is considerable.
According to body of casting quality judging method of the present invention and device can be used for slab quality judge with the product quality diagnostic system (Quality Estimation System, QES).
Although the disclosed content in front shows exemplary embodiment of the present invention, should be noted that under the prerequisite of the scope of the invention that does not deviate from the claim qualification, can carry out multiple change and modification.The function of the described claim to a method of inventive embodiments described herein, step and/or action do not need to carry out with any particular order.In addition, although element of the present invention can be with individual formal description or requirement, also it is contemplated that a plurality of, only if clearly be restricted to odd number.
Although the preferred embodiment that has combined to be shown specifically and to describe discloses the present invention; But those skilled in the art are to be understood that; For the body of casting quality judging method and the device that are used for conticaster that the invention described above proposed, can also on the basis that does not break away from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be confirmed by the content of appending claims.
Claims (9)
1. body of casting quality judging method that is used for conticaster comprises:
Process data to casting process is sampled;
Based on the process data that is sampled and the triggering formula of each quality incident of storage in advance, calculate the triggering state of each quality incident;
Triggering state based on each quality incident that is calculated; Definite current effective mass list of thing that the quality of the body of casting is exerted an influence; Wherein, The coordinate of the body of casting section that the quality incident that storage exerts an influence to the body of casting before cutting in the said effective mass list of thing and this quality incident exert an influence is interval, and does not occur simultaneously each other in the body of casting interval that the similar quality incident in the said effective mass list of thing is influenced;
To any body of casting section of the said body of casting, from the said current effective mass list of thing that the quality of the body of casting is exerted an influence, confirm all quality incidents that this body of casting section is exerted an influence;
Based on all quality incidents that this body of casting section is exerted an influence of being determined; This body of casting section is divided into a plurality of sections that do not have common factor each other; Wherein, For any said section that is marked off, the each several part of the section that this quilt marks off is influenced by identical quality event sets all, and the quality event sets that the section that this quilt is marked off exerts an influence is different with the quality event sets that another section that is marked off is exerted an influence;
To each section that is marked off; Obtain the quality event sets that the quality to this section exerts an influence; And obtain and the corresponding defective incidence of this quality set through the rule base of searching storage in advance; Thereby obtain the defective incidence corresponding, comprise the rule that has defined with the corresponding body of casting defective of quality event sets incidence in the wherein said rule base with this section;
Based on the defective incidence corresponding that is obtained, confirm the quality judging result of said body of casting section with each section.
2. the body of casting quality judging method that is used for conticaster according to claim 1, wherein, saidly confirm that the step of the current list of the quality incident that the quality to the body of casting exerts an influence comprises:
To show each the quality incident that is triggered by the triggering state that is calculated, calculate body of casting section that this quality incident influenced starting point coordinate and terminal point coordinate with respect to a fixing point on the said body of casting; And
For show each the quality incident that is triggered by the triggering state that is calculated; The coordinate of the body of casting section that is influenced based on this quality incident; With the coordinate of this body of casting section interval with previously stored effective mass list of thing in the coordinate block information of the body of casting section that is influenced about similar quality incident that comprises compare; To confirm current effective mass list of thing
If wherein the coordinate of the body of casting section that influenced of this quality incident interval with previously stored similar quality incident in the interval common factor that exists of coordinate of the body of casting section that influenced of a similar quality incident; It is interval that the interval union of coordinate of then getting these two body of casting sections substitutes the coordinate of the body of casting section that this similar quality incident in the previously stored effective mass list of thing influenced; The coordinate of the body of casting section that is influenced as similar quality incident of this quality incident and this is interval; Thereby obtain current effective mass list of thing; And if the coordinate of the body of casting section that influenced of this quality incident interval with previously stored effective mass list of thing in similar quality incident in the coordinate interval of the body of casting section that influenced of any similar quality incident all do not have common factor; Add in the previously stored effective mass list of thing in the coordinate interval of the body of casting section that then this quality incident and this quality incident is influenced, thereby obtain current effective mass list of thing.
3. the body of casting quality judging method that is used for conticaster according to claim 1, wherein, said quality judging result is one of in qualified, suspicious and defective.
4. the body of casting quality judging method that is used for conticaster according to claim 3, wherein,
When detecting fire and cut signal, confirm the quality judging result of the current predetermined body of casting section that is cut, and confirm not the quality judging result of the body of casting section of another predetermined length adjacent through fiery cutter cleavage with the current predetermined body of casting section that is cut,
If the quality judged result of the current predetermined body of casting section that is cut is different with the quality judged result of the body of casting section of this another predetermined length, then cut the said current predetermined strand section that is cut.
5. the body of casting quality judging method that is used for conticaster according to claim 4, wherein,
If the quality judged result of the quality judged result of the current predetermined body of casting section that is cut and the body of casting section of this another predetermined length all is defective; Then this current predetermined body of casting section that is cut is not cut, and these two body of casting sections are merged into a body of casting section.
6. body of casting quality judging device that is used for conticaster comprises:
Sampling unit is used for the process data of casting process is sampled;
First computing unit is used for calculating the triggering state of each quality incident based on the process data that is sampled and the triggering formula of each quality incident of storage in advance;
First confirms the unit; Be used for triggering state based on each quality incident that is calculated; Definite current effective mass list of thing that the quality of the body of casting is exerted an influence; Wherein, the coordinate of the body of casting section that the quality incident that storage exerts an influence to the body of casting before cutting in the said effective mass list of thing and this quality incident exert an influence is interval, and does not occur simultaneously each other in the body of casting interval that the similar quality incident in the said effective mass list of thing is influenced;
Second confirms the unit, is used for any body of casting section to the said body of casting, from the said current effective mass list of thing that the quality of the body of casting is exerted an influence, confirms all quality incidents that this body of casting section is exerted an influence;
Division unit; Be used for based on all quality incidents that this body of casting section is exerted an influence of being determined; This body of casting section is divided into a plurality of sections that do not have common factor each other, wherein, for any said section that is marked off; The each several part of the section that this quilt marks off is influenced by identical quality event sets all, and the quality event sets that the section that this quilt is marked off exerts an influence is different with the quality event sets that another section that is marked off is exerted an influence;
Acquiring unit; Be used to be directed against each section that is marked off; Obtain the quality event sets that the quality to this section exerts an influence; And obtain and the corresponding defective incidence of this quality set through the rule base of searching storage in advance, thereby obtain the defective incidence corresponding, comprise the rule that has defined with the corresponding body of casting defective of quality event sets incidence in the wherein said rule base with this section; And
The 3rd confirms the unit, is used for confirming the quality judging result of said body of casting section based on the defective incidence corresponding with each section that is obtained.
7. the body of casting quality judging device that is used for conticaster according to claim 6, wherein, said first confirms that the unit comprises:
Second computing unit is used for to showing each the quality incident that is triggered by the triggering state that is calculated, and calculates body of casting section that this quality incident influenced starting point coordinate and the terminal point coordinate with respect to a fixing point on the said body of casting; And
The 4th confirms the unit; Be used for for show each the quality incident that is triggered by the triggering state that is calculated; The coordinate of the body of casting section that is influenced based on this quality incident; With the coordinate of this body of casting section interval with previously stored effective mass list of thing in the coordinate block information of the body of casting section that is influenced about similar quality incident that comprises compare, with definite current effective mass list of thing
If wherein the coordinate of the body of casting section that influenced of this quality incident interval with previously stored similar quality incident in the interval common factor that exists of coordinate of the body of casting section that influenced of a similar quality incident; Then the 4th to confirm that the coordinate that the interval union of coordinate of these two body of casting sections substitutes the body of casting section that this similar quality incident in the previously stored effective mass list of thing influenced is got in the unit interval; The coordinate of the body of casting section that is influenced as similar quality incident of this quality incident and this is interval; Thereby obtain current effective mass list of thing, and
If the coordinate of the body of casting section that this quality incident is influenced interval with previously stored effective mass list of thing in similar quality incident in the coordinate interval of the body of casting section that influenced of any similar quality incident all do not have common factor; Then the 4th confirms that the coordinate interval of the body of casting section that the unit is influenced this quality incident and this quality incident adds in the previously stored effective mass list of thing, thereby obtains current effective mass list of thing.
8. the body of casting quality judging device that is used for conticaster according to claim 6; Wherein, When detecting fire and cut signal; The said the 3rd confirms that the unit confirms the quality judging result of the current predetermined body of casting section that is cut, and confirms not the quality judging result of the body of casting section of another predetermined length adjacent with the current predetermined body of casting section that is cut through fiery cutter cleavage, and said body of casting quality judging device also comprises:
The 5th confirms the unit, is used for the quality judging result according to the body of casting section of the quality judging result of the current predetermined body of casting section that is cut and adjacent another predetermined length, determines whether to cut the current predetermined body of casting section that is cut,
If the quality judged result of the current predetermined body of casting section that is cut is different with the quality judged result of the body of casting section of this another predetermined length, then the 5th confirms the said current predetermined strand section that is cut of the definite cutting in unit, and
If the quality judged result of the quality judged result of the current predetermined body of casting section that is cut and the body of casting section of this another predetermined length all is defective; Then the 5th definite unit is confirmed this current predetermined body of casting section that is cut not to be cut, and these two body of casting sections are merged into a body of casting section.
9. the body of casting quality judging device that is used for conticaster according to claim 6 also comprises:
Memory cell; Be used to store triggering formula, effective mass incident the current list and the rule base of each quality incident; Wherein, The coordinate block information that comprises the body of casting section that is influenced about the quality incident in the said effective mass list of thing, i.e. the starting point coordinate of this body of casting section and terminal point coordinate comprise the rule of correspondence of quality event sets and body of casting defective incidence in the said rule base.
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| CN105629921B (en) * | 2014-11-27 | 2019-01-08 | 上海梅山钢铁股份有限公司 | Mass defect after the completion of continuous casting steel billet cutting determines and secondary method of disposal |
| CN105618700B (en) * | 2014-11-27 | 2018-03-06 | 上海梅山钢铁股份有限公司 | The method of the abnormity point caused by changing the mouth of a river is accurately positioned on continuous casting billet |
| CN108067599B (en) * | 2016-11-15 | 2019-09-17 | 上海宝信软件股份有限公司 | Slab quality analysis method based on steel-making continuous casting overall process data |
| CN111679625B (en) * | 2020-06-29 | 2021-10-29 | 马鞍山钢铁股份有限公司 | Method for evaluating liquid level fluctuation of multi-dimensional continuous casting machine crystallizer quickly and accurately |
| CN112077273B (en) * | 2020-09-18 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Plate blank quality judgment and evaluation system and method with variable pulling speed |
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