CN104318065A - 9-degree board scratch analysis method - Google Patents
9-degree board scratch analysis method Download PDFInfo
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- CN104318065A CN104318065A CN201410507599.8A CN201410507599A CN104318065A CN 104318065 A CN104318065 A CN 104318065A CN 201410507599 A CN201410507599 A CN 201410507599A CN 104318065 A CN104318065 A CN 104318065A
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Abstract
The invention relates to a 9-degree board scratch analysis method. The 9-degree board scratch analysis method comprises the following steps: (1) establishing a sampling rule, namely calling a speed curve of a roller which is in contact with strip steel on a production line, selecting a curve record at a relatively stable time period, intercepting a one-minute curve from the curve record in the time period and marking the one-minute curve as L; uniformly dividing the curve L into sixty segments according to the time direction, and extracting a maximum value and a minimum value from each segment in sequence to form an array X [120]={X1, X2,..., X120} as an analysis sample; (2) carrying out standard deviation analysis on the analysis sample to obtain a standard deviation; (3) when the standard deviation is greater than 0.8 percent, judging that the board scratch defects are caused by speed deviation; and (4) formulating a method for solving the speed deviation. According to the 9-degree board scratch analysis method, the working efficiency is effectively improved and the production loss caused by defects is reduced.
Description
Technical field
The present invention relates to galvanizing technique field, particularly relate to 9 degree of plate faces and scratch analytic approach.
Background technology
In zinc-plated production, solving band steel, to scratch defect be a difficult tired and very long process.The scuffing defect source recognized at present mainly contains two aspects: raw material substrate, roll surface scratch.Along with the lifting of production technology and the accumulation of experience, progressively can identify the defect that raw material substrate brings, and determination methods is lacked to the scuffing that galvanized wire self roll surface produces.Plate face scratches mainly because mutual slip the between band steel and roll surface produces, and main cause has that roller footpath is not inconsistent, roll surface projection, rotating speed deviation.Through discuss and study, how to judge scuffing that velocity deviation causes, deviate reaches how much can cause scuffing, need to set up a kind of new analysis recognition method, could be qualitative by defect source, and eliminate this defect in time.
The effect of the roller of continuous belt steel production line keeps stable speed, maintains stable tension force.Keep speed of production to rely on the rotating speed of motor, tension force be kept to need to rely on torque, the two contradiction and unified.In the ideal situation, the torque that roller can keep constant runs according to instruction speed.The restriction but tension force and speed influence each other, the adjustment of tension force relies on velocity variations to realize, and this speed of production constant with maintenance contradicts.On tinuous production, tension force is fluctuating always, therefore invariable speed is non-existent, speed adjustment is the fluctuation lagging behind tension force all the time, and speed and tension force must keep one to balance dynamically, and plate face scratches and just creates in the process of this mobile equilibrium.
The reason of scuffing is caused to have a lot: such as strand raw material, linear protrusion, machinery scraping, speed do not mate, tension fluctuation etc.The adjustment of all production line external disturbances all Negotiation speeds as final in acceleration and deceleration, technical arrangement plan etc. embodies.Often these defect causes are obscured, tackled all problems at once in investigation, launch to investigate action on a large scale, expend huge human and material resources, work efficiency is very low.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of 9 degree of plate faces of effectively increasing work efficiency and scratches analytic approach.
For solving the problem, 9 degree of plate faces of the present invention scratch analytic approach, comprise the following steps:
(1) set up sampling rule:
Transfer the rate curve of the roller that production line contacts with the strip, select the curve record of section comparatively stabilization time, and intercept one minute curve in the curve record of this time period, be denoted as " L "; Curve is divided into 60 sections according to time orientation, from every section, extracts maximal value and minimum value successively, form array X [120]={ x
1, x
2..., x
120as analyzing samples;
(2) standard error analysis is carried out to analyzing samples:
Described array X [120] is input in excel electrical form and generates reduced graph, call sample standard deviation formula S TDEV (), select the head and the tail x of array
1, x
120address calculates, and obtains standard deviation;
(3) as standard deviation > 8 ‰, then judge that plate face scratches defect and caused by velocity deviation;
(4) work out the method solving velocity deviation.
The present invention compared with prior art has the following advantages:
The present invention by sample standard deviation theoretical origin to analysis in, the mode of history curve sample analysis is adopted to carry out analog rate deviation profile, thus judge whether the deviation of speed impacts plate face, not only accurately can judge the reason scratched, and greatly reduce the scope of investigation, reduce the difficulty of investigation, make implementation effect good, improve work efficiency simultaneously, effectively reduce the production loss that defect causes.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the rate curve schematic diagram that the present invention intercepts.
Fig. 2 is the rate curve schematic diagram that the present invention passes through to extract sample simulation.
In figure: 1-initial time, 2-minimum value, 4-termination time of 3-maximal value, 5-terminated line, 6-sample, 7-simulation curve.
Embodiment
9 degree of plate faces scratch analytic approach, comprise the following steps:
(1) set up sampling rule:
Transfer the rate curve of the roller that production line contacts with the strip, select the curve record of section comparatively stabilization time, and intercept one minute curve in the curve record of this time period, be denoted as " L "; Curve is divided into 60 sections according to time orientation, from every section, extracts maximal value and minimum value successively, form array X [120]={ x
1, x
2..., x
120as analyzing samples.
The tension force of tinuous production is main control parameters, and be subject to the factor impacts such as human intervention, temperature, weld seam, sideslip, tension fluctuation is very frequent.During parameter adjustment, speed is big ups and downs with the adjustment of tension force, and this process generally continues several seconds to one minute, presents the stable state gesture that periodically becomes after adjustment.Plate face short-term bar can be caused in big ups and downs interval to scratch defect, logical plate can not be caused because the time is relatively short continuously to scratch, therefore ring less to plate face.Continuously the scuffing of logical plate then can cause product demote, generally appears at velocity-stabilization traffic coverage, mainly because the deteriorated speed caused of degradation under the mechanical property of the function precision of motor and frequency converter, roller is not mated.Therefore, sampling will avoid the region of speed big ups and downs.
(2) standard error analysis is carried out to analyzing samples:
Array X [120] is input in excel electrical form and generates reduced graph, call sample standard deviation formula S TDEV (), select the head and the tail x of array
1, x
120address calculates, and obtains standard deviation.
Because X [120] is the extreme value extracted in L curve, therefore its dispersion degree is greater than actual distribution.By real velocity perturbation situation indirectly can be reflected to X [120] standard error analysis.
(3) as standard deviation > 8 ‰, then judge that plate face scratches defect and caused by velocity deviation.
(4) work out the method solving velocity deviation:
1. plant equipment investigation: the abrasion condition of running check roller and parts, ensures that hardware device operates in a more stable state; The maintenance regime standard of the lubrication of formulation equipment, fastening, adjustment, cleaning, regularly fastening, timely adjustment, ensures that lubricant grease is neither too much nor too little, will clear up in time or change when impurity is too much in grease; Guarantee that the diameter of roller is accurate; Check roll surface roughness, occur needing to change spare part immediately when obviously declining.
2. electrical equipment investigation: the change checking the resistances such as resistance variations comprises in motor, line resistance, cable splice; Variable-frequency motor has exciting current to pass through between operation, withholding period, and motor is all in electriferous state; Implement the adaptive testing of frequency converter, ensure or improve the function precision of equipment; Check scrambler, ensure its stability and accuracy of detection.
embodiment9 degree of plate faces scratch analytic approach, comprise the following steps:
(1) set up sampling rule:
As shown in Figure 1, transfer the rate curve of the roller that production line contacts with the strip, using initial time 1 for 9:28 divide, the termination time 4 divides as intercepted one minute rate curve record for 9:29, and is denoted as " L "; Curve is divided into 60 sections according to time orientation, extracts maximal value 3 and minimum value 2 successively from every section, each section just obtains two samples 6, and all maximal values 3 and minimum value 2 are formed array X [120]={ x according to time order and function order
1, x
2..., x
120as analyzing samples.
(2) standard error analysis is carried out to analyzing samples:
Array X [120] is input in excel electrical form and generates reduced graph, be i.e. simulation curve 7 as shown in Figure 2, call sample standard deviation formula S TDEV (), select the head and the tail x of array
1, x
120address calculates, and obtains standard deviation.
Because X [120] is the extreme value extracted in L curve, therefore its dispersion degree is greater than actual distribution.By real velocity perturbation situation indirectly can be reflected to X [120] standard error analysis.
(3) as standard deviation > 8 ‰, then judge that plate face scratches defect and caused by velocity deviation.
(4) work out the method solving velocity deviation:
1. plant equipment investigation: the abrasion condition of running check roller and parts, ensures that hardware device operates in a more stable state; The maintenance regime standard of the lubrication of formulation equipment, fastening, adjustment, cleaning, regularly fastening, timely adjustment, ensures that lubricant grease is neither too much nor too little, will clear up in time or change when impurity is too much in grease; Guarantee that the diameter of roller is accurate; Check roll surface roughness, occur needing to change spare part immediately when obviously declining.
2. electrical equipment investigation: the change checking the resistances such as resistance variations comprises in motor, line resistance, cable splice; Variable-frequency motor has exciting current to pass through between operation, withholding period, and motor is all in electriferous state; Implement the adaptive testing of frequency converter, ensure or improve the function precision of equipment; Check scrambler, ensure its stability and accuracy of detection.
Above-described is only preferred embodiment of the present invention, does not limit to the present invention.Should be understood that for the person of ordinary skill of the art; under technology enlightenment provided by the present invention; this analysis method can also be popularized and applied in steel strip surface defect monitor, defect analysis instrument and software kit analysis tool; other equivalent modifications and improvement can also be made; all can realize object of the present invention, all should be considered as protection scope of the present invention.
Claims (1)
1. 9 degree of plate faces scratch analytic approach, comprise the following steps:
(1) set up sampling rule:
Transfer the rate curve of the roller that production line contacts with the strip, select the curve record of section comparatively stabilization time, and intercept one minute curve in the curve record of this time period, be denoted as " L "; Curve is divided into 60 sections according to time orientation, from every section, extracts maximal value and minimum value successively, form array X [120]={ x
1, x
2..., x
120as analyzing samples;
(2) standard error analysis is carried out to analyzing samples:
Described array X [120] is input in excel electrical form and generates reduced graph, call sample standard deviation formula S TDEV (), select the head and the tail x of array
1, x
120address calculates, and obtains standard deviation;
(3) as standard deviation > 8 ‰, then judge that plate face scratches defect and caused by velocity deviation;
(4) work out the method solving velocity deviation.
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| CN201410507599.8A CN104318065A (en) | 2014-09-28 | 2014-09-28 | 9-degree board scratch analysis method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648219A (en) * | 2008-08-13 | 2010-02-17 | 鞍钢股份有限公司 | Cold rolling tension roller speed detection system and control method |
| CN102527720A (en) * | 2011-12-07 | 2012-07-04 | 鞍钢股份有限公司 | Control system and control method for multi-roller straightener of cold rolling and rewinding unit |
| CN103861875A (en) * | 2014-03-05 | 2014-06-18 | 辽宁科技大学 | Optimal control method of cold-rolling mill process cooling system |
-
2014
- 2014-09-28 CN CN201410507599.8A patent/CN104318065A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648219A (en) * | 2008-08-13 | 2010-02-17 | 鞍钢股份有限公司 | Cold rolling tension roller speed detection system and control method |
| CN102527720A (en) * | 2011-12-07 | 2012-07-04 | 鞍钢股份有限公司 | Control system and control method for multi-roller straightener of cold rolling and rewinding unit |
| CN103861875A (en) * | 2014-03-05 | 2014-06-18 | 辽宁科技大学 | Optimal control method of cold-rolling mill process cooling system |
Non-Patent Citations (2)
| Title |
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| 邢枫.: "热镀锌机组速度控制系统的研究", 《冶金设备》 * |
| 陈培林，等.: "热镀锌带钢抖动特性及其抑制", 《冶金设备》 * |
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Application publication date: 20150128 |