TW202018284A - Steel strip crease detection method including a preparation step, a measurement step, a conversion step, and a reading step - Google Patents

Steel strip crease detection method including a preparation step, a measurement step, a conversion step, and a reading step Download PDF

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TW202018284A
TW202018284A TW107138893A TW107138893A TW202018284A TW 202018284 A TW202018284 A TW 202018284A TW 107138893 A TW107138893 A TW 107138893A TW 107138893 A TW107138893 A TW 107138893A TW 202018284 A TW202018284 A TW 202018284A
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stress
steel strip
curve
axis
crease
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TWI663395B (en
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羅凱帆
吳崇勇
郭士綱
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中國鋼鐵股份有限公司
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Abstract

A steel strip crease detection method which is suitable for detecting creases on the surface of a steel strip, and includes a preparation step, a measurement step, a conversion step, and a reading step. When the preparation step is conducted, the flatness and evenness of the steel strip is confirmed and a measurement location is set. When the measurement step is conducted, an axis passing through the measurement location is defined, a magnetic stress measurement device is used to measure the steel strip along the axis direction to obtain a plurality of stress values along the axis direction and to summarize a stress curve showing a composite waveform. When the conversion step is conducted, a spectrum analytic method is used to separate the composite waveform and convert the stress curve into a conversion curve of bending amplitude and crease defect spacing. The reading step is conducted last, in which a plurality of crease defect spacings respectively corresponding to the stresses in the conversion curve is determined.

Description

鋼帶折痕檢測方法Steel belt crease detection method

本發明是有關於一種檢測方法,特別是指一種檢測鋼帶折痕的鋼帶折痕檢測方法。The invention relates to a detection method, in particular to a detection method of a steel strip crease.

鋼鐵工廠製造出鋼帶或鋼捲等材料時,製造過程中由於擠壓或是碰撞等因素,鋼帶可能會產生肉眼不易發現的折痕,因此,廠方交貨給客戶之前,需要進行品管檢驗。而檢驗人員欲針對鋼帶的折痕進行檢驗時,會先以油石研磨鋼帶表面,將表面的凸點磨去,增加反射率,使表面形成亮暗相間的紋路,此時檢驗人員再對照預先準備的標準化樣本,辨別紋路的明顯程度,藉此將折痕之嚴重程度區分為數級。When a steel factory manufactures materials such as steel belts or coils, due to factors such as extrusion or collision during the manufacturing process, the steel belt may produce creases that are not easily visible to the naked eye. Therefore, the factory needs to carry out Tube inspection. When the inspector wants to inspect the creases of the steel belt, he will first grind the surface of the steel belt with oil stone, remove the convex points of the surface, increase the reflectivity, and form a bright and dark texture on the surface. A standardized sample prepared in advance to distinguish the obvious degree of the lines, thereby dividing the severity of the crease into several levels.

然而,這種方法以人工判斷為主,從研磨鋼帶的方式、力度,油石的種類,到比對限度樣本時的基準不同,皆會影響折痕嚴重程度之判斷。也就是說,這種方法缺乏標準化,得到的結果可能因人而異,無法再現或是僅能隨機再現,假設將該等鋼帶交到客戶手中時,由於客戶研磨手法,或是油石種類的不同,而檢驗出不一樣的結果,導致雙方無法達到共識,則雙方都將蒙受其害。並且,僅靠檢驗人員的檢測,縱然不論個人主觀認定不同所造成的差異性,直接採用純人力的方式也將造成效率低落以及人力成本高昂的問題,且檢測人員的判斷力可能也會隨著精神力下降而受影響,進而影響檢測的結果。However, this method is mainly based on manual judgment, from the method and strength of grinding the steel belt, the type of oil stone, to the different benchmarks when comparing the limit samples, all will affect the judgment of the severity of the crease. That is to say, this method lacks standardization, and the results obtained may vary from person to person, and cannot be reproduced or can only be reproduced randomly. Assuming that the steel strip is delivered to the customer, due to the customer's grinding technique or the type of oil stone If the results are different and the two parties cannot reach a consensus, both parties will suffer. Moreover, relying solely on the inspection of the inspectors, even if the differences caused by individual subjective judgments are different, directly adopting the method of pure manpower will also cause problems of low efficiency and high labor costs, and the judgment of the inspectors may also follow Mental power is reduced and affected, which in turn affects the results of the test.

因此,本發明之目的,即在提供一種標準化、具有精確性及可行性,且可減少人力成本的鋼帶折痕檢測方法。Therefore, the purpose of the present invention is to provide a standardized method for detecting creases in steel belts that is accurate, accurate and feasible, and can reduce labor costs.

於是,本發明鋼帶折痕檢測方法,適用於檢測該鋼帶表面上的折痕,並包含一準備步驟、一量測步驟、一轉換步驟,及一讀取步驟。Therefore, the method for detecting the crease of the steel strip of the present invention is suitable for detecting the crease on the surface of the steel strip, and includes a preparation step, a measurement step, a conversion step, and a reading step.

進行該準備步驟時,將該鋼帶放置於一標準平面上,並在該鋼帶上設定一量測位置。When performing this preparation step, the steel belt is placed on a standard plane, and a measurement position is set on the steel belt.

進行該量測步驟時,定義一通過該量測位置之軸線,運用一磁性應力量測裝置沿該軸線方向量測該鋼帶,獲得沿該軸線方向的多個應力值,並歸納一呈現複合波形的應力曲線圖。When performing the measurement step, an axis passing through the measurement position is defined, and a magnetic stress measurement device is used to measure the steel strip along the axis direction to obtain a plurality of stress values along the axis direction, and a composite Wave stress diagram.

而該轉換步驟是運用一頻譜分析法執行複合波形的分離,將該應力曲線圖轉換為彎折振幅與折痕缺陷間距的一轉換曲線圖。And the conversion step is to use a spectrum analysis method to perform the separation of the composite waveform, and convert the stress curve into a conversion curve of bending amplitude and crease defect spacing.

最後進行該讀取步驟,判斷該轉換曲線圖中該等應力分別對應到的多個折痕缺陷間距。Finally, the reading step is performed to determine the pitches of multiple crease defects corresponding to the stresses in the conversion curve.

本發明之功效在於:藉由該磁性應力量測裝置量測該鋼帶,並運用頻譜分析法將該等折痕以標準化的數據呈現,摒除人工判斷而可能造成的誤差,而具有精確性及可行性的同時,還能降低人力成本。The effect of the present invention is to measure the steel strip by the magnetic stress measuring device, and use the frequency spectrum analysis method to present the creases as standardized data, eliminating errors that may be caused by manual judgment, and having accuracy and At the same time as feasibility, it can also reduce labor costs.

參閱圖1,本發明鋼帶折痕檢測方法之一實施例,適用於檢測一鋼帶1表面上的折痕,並包含一準備步驟2、一量測步驟3、一轉換步驟4,及一讀取步驟5。要先行說明的是,在本實施例中,是以經過軋輥軋延的該鋼帶1為檢測對象,以利於說明本發明之功效,但實際實施時,本發明鋼帶折痕檢測方法亦得以量測其他種類的工件,例如鋼捲等。Referring to FIG. 1, an embodiment of the method for detecting the creases of the steel strip of the present invention is suitable for detecting the creases on the surface of a steel strip 1, and includes a preparation step 2, a measurement step 3, a conversion step 4, and a Read step 5. It should be explained first that in this embodiment, the steel strip 1 rolled by a roll is used as the detection object to help explain the effectiveness of the present invention, but in actual implementation, the method for detecting the crease of the steel strip of the present invention is also possible Measure other kinds of workpieces, such as steel coils, etc.

參閱圖2,首先進行該準備步驟2,為了防止該鋼帶1因為放置於粗糙或歪斜的區域,而產生新的折痕,進而降低鋼帶品質並且影響量測結果,須將該鋼帶1放置於一標準平面11上。其中,該標準平面11是經過水平儀量測後之一水平的平面。確認該鋼帶1平整擺置後,即能如圖2所示地在該鋼帶1上設定出一欲量測之量測位置12。Referring to FIG. 2, the preparation step 2 is first performed. In order to prevent the steel strip 1 from being placed in a rough or skewed area, which causes new creases, thereby reducing the quality of the steel strip and affecting the measurement results, the steel strip 1 must be Place on a standard plane 11. The standard plane 11 is a horizontal plane measured by a level meter. After confirming that the steel belt 1 is flatly arranged, a measurement position 12 to be measured can be set on the steel belt 1 as shown in FIG. 2.

接著進行該量測步驟3,由於折痕主要來自鋼帶在製造過程中所受到擠壓或是碰撞而承受的應力,而當鋼帶表面受到應力時,將會影響其導磁性。利用此一型態改變而導磁性隨之改變的特性,業界常使用一磁性應力量測裝置(圖中未繪示)來進行量測。Next, the measurement step 3 is performed. Since the creases mainly come from the stress that the steel strip is subjected to during the manufacturing process due to compression or collision, when the surface of the steel strip is stressed, its magnetic permeability will be affected. Taking advantage of this type of change and the corresponding change in permeability, the industry often uses a magnetic stress measurement device (not shown in the figure) for measurement.

進行量測之前,先定義一通過該量測位置12之軸線A,考慮到該磁性應力量測設備的技術限制及量測的精確性,較佳可沿平行該軸線A之方向每隔2毫米做一標記131,進而如圖2所示地形成一標記線13,再使用該磁性應力量測設備沿該標記131個別量測。需要注意的是,該每一標記131的間隔受到目前量測設備技術的限制,然而,隨著之後量測設備技術的突破,該每一標記131的間距將會有所改變,故不以2毫米為限。Before performing the measurement, an axis A passing through the measurement position 12 is defined. Considering the technical limitations of the magnetic stress measurement device and the accuracy of the measurement, it is preferable to run every 2 mm along the direction parallel to the axis A Make a mark 131, and then form a mark line 13 as shown in FIG. 2, and then use the magnetic stress measuring device to measure individually along the mark 131. It should be noted that the interval of each mark 131 is limited by the current measurement equipment technology. However, with the breakthrough of the measurement equipment technology later, the distance of each mark 131 will change, so it is not 2 Mm only.

經過量測之後,將會獲得該鋼帶1之該標記線13的多個軸向磁通量,並可將該等磁通量分別轉換為多個應力值。定義F 為應力,

Figure 02_image001
分別代表X軸與Y軸之磁通量,
Figure 02_image003
分別代表X軸與Y軸之條件函數,其中,該等磁通量與該等應力值的關係式為
Figure 02_image005
。要特別說明的是,
Figure 02_image007
Figure 02_image001
皆為向量,得以同時呈現方向以及量值。After the measurement, a plurality of axial magnetic fluxes of the marking line 13 of the steel strip 1 are obtained, and the equivalent magnetic fluxes can be converted into a plurality of stress values, respectively. Define F as stress,
Figure 02_image001
Represent the magnetic flux of X axis and Y axis,
Figure 02_image003
Respectively represent the condition function of X axis and Y axis, where the relationship between the magnetic flux and the stress value is
Figure 02_image005
. In particular,
Figure 02_image007
,
Figure 02_image001
All are vectors, which can show the direction and magnitude at the same time.

值得說明的是,所述條件函數隨鋼帶導磁性不同而改變,例如碳含量、各種金屬成分含量,及焠火時間等等可能影響導磁性的參數,都會影響到函數的數值。因此,成分或是製程不同之鋼帶,將會有不同的條件函數。反言之,相同材質與製程之鋼帶的條件函數會是相同的。因此,廠方與客戶量測該鋼帶之該等磁通量後,藉由相同的條件函數可計算出相同的結果。It is worth noting that the condition function varies with the magnetic permeability of the steel strip. For example, the carbon content, the content of various metal components, and the quenching time and other parameters that may affect the magnetic permeability will affect the value of the function. Therefore, steel strips with different compositions or processes will have different conditional functions. Conversely, the conditional function of steel strips of the same material and manufacturing process will be the same. Therefore, after measuring the magnetic flux of the steel strip, the manufacturer and the customer can calculate the same result by the same condition function.

參閱圖3、圖4,量測出該等應力值後,再以該磁性應力量測裝置沿該標記線13移動的距離為X軸,該距離對應到的該等應力值為Y軸,描繪出一如圖3所示之應力曲線圖,圖3中所呈現之一應力曲線6,可在細微的尺度下記錄該鋼帶1表面折痕變化。然而,鋼帶表面產生折痕的原因繁雜,有可能來自於擠壓、碰撞,或是刮傷等,而每一種因素都會以一波形訊號各自呈現,所以該應力曲線6將會呈一複合波形。對於廠方而言,找出折痕的位置之餘,也希望能從該應力曲線6分析找出折痕發生的原因,並作為改善製程與器材調校的依據。Referring to FIG. 3 and FIG. 4, after measuring the stress values, the distance moved by the magnetic stress measuring device along the marking line 13 is taken as the X axis, and the corresponding stress values corresponding to the distance are the Y axis. A stress curve as shown in FIG. 3 is shown. A stress curve 6 shown in FIG. 3 can record the crease changes on the surface of the steel strip 1 at a fine scale. However, the reasons for the creases on the surface of the steel strip are complicated, which may come from extrusion, collision, or scratching, and each factor will be represented by a waveform signal, so the stress curve 6 will be a composite waveform . For the factory, in addition to finding the location of the crease, it is also hoped that the cause of the crease can be analyzed from the stress curve 6 and used as the basis for improving the process and equipment adjustment.

因此,在該轉換步驟4時,廠方可以運用快速傅立葉轉換法(Fast Fourier Transform, FFT)分析該應力曲線6,而將圖3所呈現的該應力曲線6,轉換為以X軸為折痕缺陷間距,Y軸為彎折振幅,並描繪一如圖4所示之轉換曲線7,以利於分析原本之複合波形所含的彎折資訊。Therefore, in this conversion step 4, the factory can use the Fast Fourier Transform (FFT) to analyze the stress curve 6, and convert the stress curve 6 shown in FIG. 3 into the X-axis as a crease For the defect spacing, the Y axis is the bending amplitude, and a conversion curve 7 as shown in FIG. 4 is depicted to facilitate analysis of the bending information contained in the original composite waveform.

最後是進行該讀取步驟5,藉由判斷該轉換曲線7上的峰值所對應到的間距,可以瞭解該鋼帶1在該間距時有一折痕,再藉由經驗法則,從該間距大小數值,判斷該折痕對應的成因,且可從該峰值的大小判斷該折痕的嚴重性。舉例來說,如圖4所示,在間距10~16毫米時,具有一峰值P1,在間距23毫米時,具有一峰值P2,則可由該峰值P1、P2出現的間距位置,判斷對應之折痕可能的成因。Finally, the reading step 5 is performed. By judging the interval corresponding to the peak on the conversion curve 7, it can be understood that the steel strip 1 has a crease at the interval, and then, according to the rule of thumb, the value of the interval value To determine the cause of the crease and determine the severity of the crease from the size of the peak. For example, as shown in FIG. 4, when the pitch is 10-16 mm, there is a peak P1, and when the pitch is 23 mm, there is a peak P2, the corresponding position of the peak P1 and P2 can be used to determine the corresponding discount Possible causes of marks.

然而,判斷方式依照鋼帶製程與材質不同,而有所差別,因此廠方與客戶可藉由該標準化的數據,約定一判斷基準,之後則可依據所約定的判斷基準,進行標準的交互檢核。However, the judgment method is different according to the steel belt process and material, so the factory and the customer can use the standardized data to agree on a judgment standard, and then can perform standard interactive inspection based on the agreed judgment standard nuclear.

以下,將說明本發明鋼帶折痕檢測方法之再現性,並以現行人工檢測的鋼帶試片14、無折痕之基準鋼帶15,以及影像比對鋼帶16,以上三者相互比較,檢驗本發明鋼帶折痕檢測方法的可執行性及檢測的準確性。In the following, the reproducibility of the steel strip crease detection method of the present invention will be described, and the steel strip test strip 14, the crease-free reference steel strip 15 and the image comparison steel strip 16 which are currently manually detected are compared with each other. , Examine the executability and accuracy of the detection method of the steel strip crease of the present invention.

參閱圖2、圖5,使用該磁性應力量測裝置沿該標記線13重複量測如圖2所示的該鋼帶1三次,並可分別描繪出如圖5所示的三條應力曲線。分別是一採用實線表示之第一應力曲線61、一採用虛線表示之第二應力曲線62,及一採用一點鏈線表示之第三應力曲線63。由圖5可知,三次量測出的應力曲線變化趨於一致,可見多次量測會得到相同的趨勢結果,測量的再現性佳。而該等應力曲線分別轉換出如圖6所示的三條轉換曲線,分別為一採用實線表示之第一轉換曲線71、一採用虛線表示之第二轉換曲線72,及一採用一點鏈線表示之第三轉換曲線73。如圖6所示,該等轉換曲線變化趨勢大致相同,故可證明本發明鋼帶折痕檢測方法具有再現性。Referring to FIGS. 2 and 5, the magnetic stress measuring device is used to repeatedly measure the steel strip 1 shown in FIG. 2 three times along the marking line 13, and three stress curves as shown in FIG. 5 can be depicted respectively. These are a first stress curve 61 indicated by a solid line, a second stress curve 62 indicated by a dotted line, and a third stress curve 63 indicated by a dotted line. It can be seen from FIG. 5 that the change of the stress curve measured by the three measurements tends to be consistent, and it can be seen that multiple measurements will get the same trend results, and the measurement reproducibility is good. The stress curves are converted into three conversion curves as shown in FIG. 6, which are a first conversion curve 71 indicated by a solid line, a second conversion curve 72 indicated by a dotted line, and a one-point chain line.之第3 Transformation curve 73. As shown in FIG. 6, the change trends of the conversion curves are approximately the same, so it can be proved that the steel strip crease detection method of the present invention is reproducible.

參閱圖7、圖8,及圖9,圖7中的鋼帶試片14折痕間距S為10~15毫米,使用該磁性應力量測裝置量測該鋼帶試片14,並如圖8所示地描繪一試片應力曲線64。而該試片應力曲線64經過快速傅立葉轉換後得到一如圖9所示的試片轉換曲線74,由圖9可知間距11~15毫米的位置有一峰值P3,表示該鋼帶試片14在間距11~15毫米時有磁力變化,由此可知在該位置具有折痕,和巨觀尺度下觀測的結果相同。Referring to FIGS. 7, 8 and 9, the crease spacing S of the steel strip test piece 14 in FIG. 7 is 10 to 15 mm. Use the magnetic stress measuring device to measure the steel strip test piece 14 as shown in FIG. 8 A stress curve 64 of a test piece is depicted as shown. After the fast Fourier transform of the test piece stress curve 64, a test piece conversion curve 74 as shown in FIG. 9 is obtained. It can be seen from FIG. 9 that there is a peak P3 at a position of 11 to 15 millimeters, indicating that the steel strip test piece 14 is at a spacing From 11 to 15 mm, there is a change in magnetic force, which shows that there is a crease at this location, which is the same as the observation result at the macroscopic scale.

參閱圖10、圖11,設定圖10中之無折痕的基準鋼帶15作為對照組,運用本發明鋼帶折痕檢測方法分析該基準鋼帶15而描繪一如圖11所示之基準鋼帶轉換曲線75,可以看到並無特別突出之間距訊號,且訊號振幅相當微弱,以此說明該基準鋼帶15表面的導磁性變化不大。而該基準鋼帶15由於沒有折痕,表示其表面未受應力影響,導磁性不會出現明顯的峰谷變化,與該基準鋼帶轉換曲線75所述相同。Referring to FIGS. 10 and 11, the reference steel strip 15 without creases in FIG. 10 is set as a control group, and the reference steel strip 15 is analyzed using the method for detecting the crease of the steel strip of the present invention to depict a reference steel as shown in FIG. 11 With the conversion curve 75, it can be seen that there is no signal with a particularly large distance between them, and the signal amplitude is relatively weak, which means that the magnetic permeability of the surface of the reference steel strip 15 does not change much. Since the reference steel strip 15 has no creases, it means that its surface is not affected by stress, and there is no obvious peak-valley change in magnetic permeability, which is the same as that described in the reference steel strip conversion curve 75.

參閱圖12與圖13,現行之一檢測方法為研磨使明暗程度更加明顯後,再以肉眼依據預備的參考圖來判斷比對。為了確認使用本發明鋼帶折痕檢測方法與該現行檢測方法之對應性,先使用該磁性應力量測裝置,軸向量測一影像比對鋼帶16而描繪一影像比對應力曲線65,之後研磨該影像比對鋼帶16,並拍一照片8作為記錄,再將該照片8轉為灰階,可見該影像比對鋼帶16表面折痕分為較亮及較暗的痕跡。初步比對該圖12與圖13,可見該影像比對應力曲線65的起伏轉折處,波峰對應到該較亮的痕跡,波谷則對應到該較暗的痕跡。與該照片8中亮暗痕跡相吻合。再將該照片8軸向依照色調深淺轉成一個0~255灰階曲線81,再與該影像比對應力曲線65一同比對。為方便比對,將該灰階曲線81與該影像比對應力曲線65一同放置,形成一如圖13所示之灰階-應力曲線比對圖。經過比對結果,可更清楚地看出該影像比對應力曲線65與該灰階曲線81的起伏趨勢幾乎相同。綜合前兩段所述,以此可確認使用本發明鋼帶折痕檢測方法,確實可以描述折痕型態,而具有可行性。Referring to FIG. 12 and FIG. 13, one of the current detection methods is to judge the comparison with the naked eye according to the prepared reference map after grinding to make the lightness and darkness more obvious. In order to confirm the correspondence between the detection method of the steel strip crease of the present invention and the current detection method, first use the magnetic stress measuring device, the axial vector measures an image comparison steel strip 16 and draws an image comparison stress curve 65, After grinding the image comparison steel strip 16, and taking a photo 8 as a record, and then converting the photo 8 to grayscale, it can be seen that the surface folds of the image comparison steel strip 16 are divided into brighter and darker traces. A preliminary comparison of Fig. 12 with Fig. 13 shows that the image compares the ups and downs of the stress curve 65, the peak corresponds to the brighter trace, and the valley corresponds to the darker trace. It matches the bright and dark traces in this photo 8. Then, the 8-axis of the photo is converted into a 0-255 gray scale curve 81 according to the shade of the tone, and then compared with the image to the stress curve 65. For the convenience of comparison, the gray-scale curve 81 and the image-comparison stress curve 65 are placed together to form a gray-scale-stress curve comparison diagram as shown in FIG. 13. After the comparison results, it can be more clearly seen that the image comparison stress curve 65 and the gray scale curve 81 have almost the same fluctuation tendency. Based on the above two paragraphs, it can be confirmed that the method for detecting the crease of the steel strip of the present invention can indeed describe the crease pattern, and it is feasible.

綜上所述,本發明鋼帶折痕檢測方法藉由導磁性與折痕間的關係,只要使用該磁性應力量測裝置,即可提供標準化、結果精確,且可說明表面折痕之應力曲線,並可運用快速傅立葉轉換法,分析該等應力曲線來探討該等折痕的成因與嚴重性。更重要的是,本發明鋼帶折痕檢測方法不需經過研磨,足以摒除研磨手法不同或判斷基準不一可能造成的誤差,同時還能降低人力成本。故確實能達成本發明之目的。In summary, the method for detecting the crease of the steel strip according to the present invention can provide standardized, accurate results and can explain the stress curve of the surface crease by using the magnetic stress measurement device as long as the magnetic stress measurement device is used And, the fast Fourier transform method can be used to analyze the stress curves to explore the cause and severity of the creases. More importantly, the steel strip crease detection method of the present invention does not need to be ground, which is enough to eliminate errors that may be caused by different grinding methods or different judgment standards, and at the same time reduce labor costs. Therefore, the purpose of cost invention can indeed be achieved.

惟以上所述者,僅為本發明之實施例而已,當不能以此限定本發明實施之範圍,凡是依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾,皆仍屬本發明專利涵蓋之範圍內。However, the above are only examples of the present invention, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as This invention covers the patent.

1:鋼帶11:標準平面12:量測位置13:標記線131:標記14:鋼帶試片15:基準鋼帶16:影像比對鋼帶2:準備步驟3:量測步驟4:轉換步驟5:讀取步驟6:應力曲線61:第一應力曲線62:第二應力曲線63:第三應力曲線64:試片應力曲線65:影像比對應力曲線7:轉換曲線71:第一轉換曲線72:第二轉換曲線73:第三轉換曲線74:試片轉換曲線75:基準鋼帶轉換曲線8:照片81:灰階曲線A:軸線P1:峰值P2:峰值P3:峰值S:間距 1: steel strip 11: standard plane 12: measurement position 13: mark line 131: mark 14: steel strip test piece 15: reference steel strip 16: image comparison steel strip 2: preparation step 3: measurement step 4: conversion Step 5: Reading step 6: Stress curve 61: First stress curve 62: Second stress curve 63: Third stress curve 64: Test piece stress curve 65: Image comparison stress curve 7: Conversion curve 71: First conversion Curve 72: Second conversion curve 73: Third conversion curve 74: Test piece conversion curve 75: Reference steel strip conversion curve 8: Photo 81: Gray scale curve A: Axis P1: Peak P2: Peak P3: Peak S: Spacing

本發明之其他的特徵及功效,將於參照圖式的實施方式中清楚地呈現,其中: 圖1是一方塊流程圖,說明本發明鋼帶折痕檢測方法之一實施例; 圖2是一示意圖,說明該實施例的一準備步驟; 圖3是一曲線圖,說明量測該鋼帶而描繪出之一應力曲線圖; 圖4是一曲線圖,說明該應力曲線圖經由快速傅立葉轉換而描繪出之一轉換曲線圖; 圖5是一類似於圖3之曲線圖,說明重複量測該鋼帶三次而分別描繪出之三條應力曲線; 圖6是一類似於圖4之曲線圖,說明該等應力曲線經由快速傅立葉轉換而描繪出之三條轉換曲線; 圖7是一局部正視圖,說明一鋼帶試片的表面折痕型態; 圖8是一類似於圖3之曲線圖,說明量測該鋼帶試片而描繪出之一試片應力曲線圖; 圖9是一類似於圖4之曲線圖,說明該試片應力曲線圖經由快速傅立葉轉換而描繪出之一試片轉換曲線圖; 圖10是一局部正視圖,說明一基準鋼帶的表面折痕型態; 圖11是一類似於圖4之曲線圖,說明該基準鋼帶經由本實施例描繪出之一基準鋼帶轉換曲線圖; 圖12是一局部正視圖,說明一影像比對鋼帶的表面折痕型態;及 圖13是一曲線圖,說明一灰階曲線與一影像比對應力曲線之比較。Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a block flow diagram illustrating an embodiment of the method for detecting the crease of the steel strip of the present invention; FIG. 2 is a A schematic diagram illustrating a preparation step of the embodiment; FIG. 3 is a graph illustrating a stress curve drawn by measuring the steel strip; FIG. 4 is a graph illustrating the stress curve through fast Fourier transform One conversion curve is depicted; FIG. 5 is a graph similar to FIG. 3, illustrating the three stress curves respectively depicted by repeatedly measuring the steel strip three times; FIG. 6 is a graph similar to FIG. 4, illustrating The three transformation curves are depicted by the fast Fourier transformation of these stress curves; FIG. 7 is a partial front view illustrating the surface crease pattern of a steel strip test piece; FIG. 8 is a graph similar to FIG. 3, illustrating Measuring the steel strip test piece and drawing a stress curve of one test piece; FIG. 9 is a graph similar to FIG. 4, illustrating that the stress curve of the test piece depicts a test piece conversion curve through fast Fourier transform Fig. 10 is a partial front view illustrating the surface crease pattern of a reference steel strip; FIG. 11 is a graph similar to FIG. 4 illustrating that the reference steel strip depicts a reference steel strip through this embodiment Conversion graph; FIG. 12 is a partial front view illustrating the surface crease pattern of an image comparison steel strip; and FIG. 13 is a graph illustrating the comparison of a gray scale curve and an image comparison stress curve.

2:準備步驟 2: preparation steps

3:量測步驟 3: Measurement steps

4:轉換步驟 4: Conversion steps

5:讀取步驟 5: Reading steps

Claims (4)

一種鋼帶折痕檢測方法,適用於檢測該鋼帶表面上的折痕,並包含: 一準備步驟,將該鋼帶放置於一標準平面上,並在該鋼帶上設定一量測位置; 一量測步驟,定義一通過該量測位置之軸線,運用一磁性應力量測裝置沿該軸線方向量測該鋼帶,獲得沿該軸線方向的多個應力值,並歸納一呈現複合波形的應力曲線圖; 一轉換步驟,運用一頻譜分析法執行複合波形的分離,將該應力曲線圖轉換為彎折振幅與折痕缺陷間距的一轉換曲線圖;及 一讀取步驟,由該轉換曲線圖中判斷該等應力分別對應到的多個折痕缺陷間距。A steel belt crease detection method, suitable for detecting creases on the surface of the steel belt, and includes: a preparation step, placing the steel belt on a standard plane, and setting a measurement position on the steel belt; A measuring step, defining an axis passing through the measuring position, using a magnetic stress measuring device to measure the steel strip along the axis direction, obtaining a plurality of stress values along the axis direction, and summing up a complex waveform A stress curve; a conversion step, using a spectrum analysis method to perform the separation of the composite waveform, converting the stress curve into a conversion curve of bending amplitude and crease defect spacing; and a reading step, from the conversion curve In the figure, the distance between multiple crease defects corresponding to these stresses is determined. 如請求項1所述的鋼帶折痕檢測方法,其中,在該量測步驟中,該磁性應力量測裝置沿該軸線方向量測該量測位置之多個軸向磁通量,並將該等軸向磁通量分別轉換為多個應力值,再以該磁性應力量測裝置沿該軸線方向移動的距離為X軸,該距離對應到的該等應力值為Y軸,構成該應力曲線圖。The steel belt crease detection method according to claim 1, wherein, in the measuring step, the magnetic stress measuring device measures a plurality of axial magnetic fluxes at the measurement position along the axis direction, and compares these The axial magnetic flux is converted into a plurality of stress values respectively, and then the distance moved by the magnetic stress measurement device along the axis direction is the X axis, and the corresponding stress values corresponding to the distance are the Y axis to form the stress curve. 如請求項2所述的鋼帶折痕檢測方法,定義F 為應力,
Figure 03_image009
分別代表X軸與Y軸之磁通量,
Figure 03_image011
分別代表X軸與Y軸之條件函數,且所述條件函數是隨該鋼帶材質不同而改變,其中,該等磁通量與該應力曲線圖之該等應力的關係式為
Figure 03_image013
According to the method for detecting creases in steel strip as described in claim 2, F is defined as stress,
Figure 03_image009
Represent the magnetic flux of X axis and Y axis,
Figure 03_image011
Respectively represent the condition functions of the X axis and the Y axis, and the condition function changes with the material of the steel strip, wherein the relationship between the magnetic flux and the stress in the stress curve is
Figure 03_image013
.
如請求項1所述的鋼帶折痕檢測方法,其中,該分析步驟之該頻譜分析法為快速傅立葉轉換。The method for detecting creases in a steel strip according to claim 1, wherein the spectrum analysis method in the analysis step is fast Fourier transform.
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