TW200806428A - Method of examining rolling surface quality by grinding vibration - Google Patents

Abstract

A method of examining the rolling surface quality by grinding vibration comprises a vibration-captured step, a spectrum-calculated step, a standardization step, a re-sampling step, and a weighted sum step. The spectrum-calculated step is that each vibration signal of the grinding path transfers to the vibration spectrum. The standardization step is that each vibration spectrum of the grinding path conducts the standardization transformation corresponding to the rotation rate at the captured time, so the vibration spectrum with the same node can be arranged correspondingly. The re-sampling step is to re-sample the vibration spectrum after standardization to make that the interval of the captured point with the same node of different grinding path is the same. The weighted sum step is that the vibration spectrum after re-sampling multiplies an index weight, and then adds the vibration range of the same node to obtain the quality quota which stands for degree of grinding mark of the rolling surface.

Description

200806428 IX. Description of the Invention: [Technical Field] The present invention relates to a method for inspecting the grinding quality of a worker roll, and more particularly to a method for inspecting the surface quality of a worker roll by using a grinding vibration. [Prior Art]

Referring to FIG. 1 and FIG. 2, in general, the work roll 2 for the rolling equipment needs to grind the surface of the work light 2 by using the grinding wheel 31 on the grinding machine 3 after rolling the semi-finished product for a period of time, that is, as shown in FIG. , to the surface quality of the green insurance. The general work roll 2 grinding operation is a multi-pass grinding, that is, the grinding wheel 31 is grinded back and forth several times. At the same time, the speed of the roller 2 can be adjusted and changed in different passes. During the grinding process, there is a periodic relative movement between the grinding wheel 31 and the roller 2. This _relative motion causes the grinding depth to periodically mutate' and causes a wavy change on the roll surface, which is called the grinding roll mark 'that is shown in Figure 2' and the vibration behavior of the money-like surface defect is called grind Vibration. It should be – the grinding roller marks drawn on Figure 2 are not easy to analyze clearly, and here are highlighted. When the steel roll is changed by the work roll, the flutter of the steel § grinding is too serious, and the grinding roll marks may be caused by three kinds of unfavorable effects after the drying process. The grinding roll mark 21 will be directly transferred. To the steel strip, the surface of the surface between the light and dark rolling marks; a transfer to the back roll, causing the rolling force dynamic change T surface milk marks; Second, the grinding roller marks 21 pitch just trigger the flutter of the rolling mill, resulting in Steel 200806428 with vibration and forms a rolling mark. As the customer's surface quality requirements for rolling products are becoming more and more 'if these rolled products are rolled to downstream manufacturers, they are likely to be rejected' and may also affect the surface of the rewinding of downstream manufacturers. Another transfer mechanism has been formed locally. Therefore, the scene of the rolling marks on the surface of the rolled product is very deep and wide, and the rolling operation is not prudent. In order to reduce the occurrence of rolling marks on the surface of the rolled product, it is usually to monitor the vibration of the grinding machine 3 of the grinding roller 2 to understand the severity of the vibration.

Conventional monitoring of grinding machine vibration equipment, such as the British AMTRI grinding machine monitoring system, has two vibration measuring channels, which are mainly used to measure the vibration of the spindle and the seat of the grinding machine. The signal measurement method relies on analog signal processing, and the original signal passes through two different bandpass filters, 20Hz~70Hz and 130Hz~250Hz. The low frequency band (20 Hz to 70 Hz) usually represents the vibration of a larger component, such as a bed. The high frequency band (130 Hz to 250 Hz) usually represents the vibration of a smaller component, such as a spindle. The analogy/digital conversion is performed after the signals of the two frequency bands are analogically calculated, so the main monitoring parameter of the UK AMTRI grinding machine monitoring system is the total vibration of the fixed frequency band during the grinding process of the work rolls. Another conventional method for monitoring grinding machine vibration equipment, such as the American Emerson CSI 4500 system. The main measurement signals are the horizontal vibration of the frame, the horizontal and vertical vibration of the main shaft, and the horizontal vibration of the head motor. Through the digital signal processor (DSP) unit, the signal can be processed first and then transmitted back to the control computer and database through the network. Overall, the US Emerson CSI 4500 system emphasizes two functions: 6 200806428 I. Continuous monitoring of the occurrence of chatter and reminding operation; Second, trend management can be performed to record historical data. However, this is not much different from the previous British AMTRI grinding machine monitoring system. In addition to the detection of flutter, the CSI 45GG system also provides bearing diagnostics for all types of flat and ball bearings in the grinding machine. The trick is that these functions are not very effective for the grinding quality of the work surface. Another familiar use to monitor grinding machine vibration equipment, such as the Italian Pomini mill

The bed vibration monitoring system is based on the personal computer as a structure (pc Base). Use an accelerometer (BK) and mount it above the spindle. The data acquisition of this system is completed by the fine card in the control computer, and the measured value is also the total amount of vibration. The p〇mini grinder vibration monitoring system alarm mode is also based on the monitoring of band energy. This system allows the user to set (4) Μ«' different measurement parameters. This type of alert is similar to the amtri system and is easier to implement. A different grinder vibration monitoring system is described for analysis. They are mainly monitored for the "vibration" of the grinding grind and cannot be stepped into the "grinding light marks 21" on the surface of the work roll 2. However, since the grinding operation of the work is a multi-pass force_procedure, the grinding roll marks 21 formed in a certain grinding pass are left to the end. The lower-Μ Μ , , , , , , , , 而不 — — — — — 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 磨 磨 磨 磨 磨 磨 振动 振动In the processing procedure, the grinding marks 21 are formed first, and the grinding roll marks 21 formed by the first processing may (but not necessarily 200806428) be eliminated for subsequent processing. Moreover, the system cannot reflect the fact that the vibration amount of the small bed vibration monitoring system during fine grinding. In other words, TM heart: Table: to know that the final formation in the work (four) heart two vibration = system In addition, in order to reduce the generation of grinding roller marks 21, the grinding is usually achieved by reducing the grinding speed, iron, staying staff ring grinding Efficiency, which in turn delays the subsequent rolling operations. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for polishing a surface material f by grinding, which can accurately estimate the serious squeaking of the final surface of the light by monitoring the vibration, thereby improving the polishing efficiency. Thus, the present invention utilizes a method of grinding vibration to inspect the surface quality of a workpiece, including a step of extracting vibration, a step of calculating a spectrum, a step, and a step of resampling, the step of utilizing a pick-up that is mounted on a grinding machine. The vibrating blade swayed 5 to capture the vibration signal of the work roll at all grinding passes. The step of calculating the spectrum is to convert the vibration signal of each grinding pass into a vibration spectrum. The normalization step is to normalize the vibration-spectrum of the mother-grinding pass relative to the rotational speed of the (four) t, so that the vibration spectrum having the same pitch in the front and rear grinding passes corresponds to (4). The resampling step is to sample the normalized vibrational spectral lines for each grinding pass so that the intervals of the same pitch of the different grinding passes are equal. The weighted summation step is to multiply the re-sampled vibration spectrum by the -index weight to make the subsequent grinding pass, and the higher the weight of the 200806428 index is, and then add the vibration amplitudes of the same pitch of all the grinding passes. , a quality index indicating the severity of the grinding roll on the roll surface of the work roll can be obtained.

The effect of the present invention is to consider the magnitude of the vibration of each grinding pass during the complete grinding process, rather than by the value of the single vibration magnitude, in order to correctly estimate the severity of the final surface grinding roll marks of the work rolls. In this way, the work of grinding the marks of the grinding rolls is prevented from “affecting the quality of the subsequent rolling process and the associated output of the steel strip. At the same time, the operator can also reduce the grinding rate due to avoiding the occurrence of grinding marks”, which can improve the grinding efficiency. The above-mentioned and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the present invention. A preferred embodiment of the method of using a grinding vibration inspection work roll two-grinding table includes a process vibration u, a calculation spectrum step 12, a normalization step & a step 14, and a weighted summation step 15. The step of taking the vibration step 1 is to use the vibration recorder 4 mounted on the grinding machine 3 to extract the vibration of the grindstone 2 on all the grinds. Signal. Referring to Figures 2 to 4, the calculation of the spectrum step - the signal is converted to a vibration spectrum. Α 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 砮 篦 篦 篦 篦 篦 篦 篦 篦 篦 篦 篦 篦 篦 篦 篦In this preferred case, ^ / 7 is 15 times as an example, that is, &, &, s 疋 U U U 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 关于 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 The prior art can be easily accomplished by those having ordinary knowledge in the technical field and will not be described in detail herein. The normalization step 3 normalizes the vibration spectrum of each grinding pass with respect to the 4 2 rotation speed of the picking material, so that the vibration spectrum &amp with the same pitch (phch) in the front and rear grinding passes ; corresponding arrangement. 7 Stomach 1 5 'The severity of the grinding 会 will be related to the flutter energy of the grinding

The size is proportional to 'so that when a grinding pass vibrates more than the formed grinding roll mark, it may be removed in the next grinding pass; but if the roll mark is too deep, the shirt will be completely removed. In the next grinding channel ^, the cutting amount will be periodically changed, and the grinding force will be periodically changed. The frequency is the flutter frequency of the grinding roller mark. It is estimated by the intensity of the flutter frequency energy that the severity of the grinding roll remaining on the swollen surface is severe. Suppose that in a certain grinding, the deeper grinding pitch λ (ie, the spacing between two adjacent grinding reductions) is caused, the U rotation speed is Λι, the work b 2 line speed is ~, the work report 2 diameter is D, the painter vibration The frequency is Λ, the relationship between the Bay q pitch λ and the frequency vibration force is the following formula (1): 1 (1) The grinding roller is traced in the subsequent grinding pass, and the induced flutter frequency force is the following formula (7): ' (2) /2=苎10 200806428 where '2 is the new speed of the work roll 2. Substituting equation (1) into equation (2), -Γ~) can obtain the relationship between the flutter frequency and λ, as shown in the following equation (3) The Le (four) distance between the passes is the same as the different grind/疋. The size of the lay length can be 2 rolls of the work roll 2 2' on the m mark no' corresponding to the grinding pass of the time, p grinding roll marks are formed on the work piece 2. V. In the figure Z, 'is the vibration spectrum change of each grinding pass in the grinding process. :: The processing parameters of the rear t (such as the spindle speed, the work roll speed) will continue, and the parent's 'vibration spectrum of the grinding pass' will be high. The position of the point is also constant, so in the field of vibration spectrum &, it is impossible to clearly distinguish the effect of each grinding on the final surface quality. In conjunction with Figure 5, 'therefore, the ancient woman does not want to see the iim 乂 乂 3 3 即 即 即 即 即 即 即 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = For the pitch field (Pitch D_in), as shown in the following equation (4):

Ψ j if) = S m '^7 The gift for a certain grinding pass is pit_. The negative point in the coffee (10) represents the vibration of the pitch of the circumference of the work roll 2 by 1". If the pitch generated by the vibrations before and after - even if the guard parameters are different, in pitr (4) 200806428: will appear in the same position. Figure 5 is the h-shape of Figure 4 converted to phch - as can be clearly seen in Figure 5, there are two main pitches (ie corresponding to P 73, and 90 positions, such as thick dashed lines) always appear in the same corresponding position These two pitch grinding roller marks are always present on the surface of the work roll 2 during the grinding process. It should be specially stated that this corresponding phenomenon is not obvious in 4, and this characteristic will be apparent after the vibration frequency edge is normalized. Yes

By utilizing this feature in the present invention, it is possible to track the progression of the grinding roll marks having the same pitch under different processing conditions for each grinding pass to estimate the severity of the grinding roll marks. < - Referring to Figures 3, 6 and 7, the resampling step 4 is to resample (4) the vibration spectrum after normalization of each grinding person to make the same pitch of different grinding passes. The vibration frequency intervals are equal. Because of the relationship of the previous step (i.e., the normalization step 3), the original acquired =# is divided by the light rotational speed A, so the original frequency (X-axis) interval is constant. That is to say, the vibration frequency intervals of two adjacent grinding passes will be different, as shown in Fig. 6. The re-sampling step 4 is such that the vibration frequency intervals of all the vibration spectra & are made the same for subsequent operations, as shown in FIG. In the preferred embodiment +, linear interpolation is used.

Interpolat1()n)m(x) is a new sequence of vibrational spectral data, and if a new X(v) is to be taken between the x(A:) and χβ+Ι) points, then X(V) The corresponding vibration value S(v) is: s(y)^^{k)+(v^k) x(k + l)-x(k) ~{k + l)--k (5) 12

(6) 200806428 Weighing weight two:: (4) (5) For each 1 grinding pass vibration spectrum ~ between =; the two frequency intervals become the same. It should be noted that if the continuous vibration frequency is resampled, it can no longer be carried out. Referring to Figure 8, together with Figure 2, the vibration spectrum of Ms. Gu is multiplied by a "weight' and step 5 is correct Retake (4) the number of hearts pushes the gravity 'to make the #动二' number of the grinding pass of the rear of the grinding pass ~ the higher the height. Then add all the grinding passes - the pitch ==, you can get one to indicate The quality index of the severity of the grinding roller mark 21 on the roll surface of the work roll 2. In the preferred embodiment, the index weight is defined as the following formula (6): η Λ y!__ = 1 represents the total number of grinds 4 represents the weight Control parameters. If the moxibustion value is too large, the closer it is to the grinding channel in the back. The higher the proportion of the vibration amplitude is, the more important it is to be affected by the (4) grinding series (4). The effect of the roll marks left behind by the grinding pass increases the overall effect. In fact, this & value can take 0.5. After the adjustment of the index weight %, all the grinding passes can be vibrated at the same pitch. The sum of the amplitudes can be obtained to obtain the formation of different pitches. The quality index of the severity of the roll mark 21. As can be clearly seen in Figure 8, there are two distinct peaks, which represent that in this grinding operation, there may be a pitch of 1/73 of the circumference of the work roll 2 and 1/90 grinding roller mark. 13 200806428 ^Unloading the above, the method of using the grinding vibration inspection tool to grind the surface of the surface is to consider the magnitude of the vibration of each grinding pass in the complete grinding process, rather than by single-vibration Judging by the size value, all the vibrational spectra are: normalized, re-sampling, so that they can be weighted and summed. At the same time, with the use of index weights, the reduction will be traced by subsequent grinding: It can accurately estimate the grinding roller marks and the heavyness of the final surface of the work roll, thereby avoiding the grinding of the work rolls with the grinding roll marks and affecting the rolling process and the related output of the steel strip quality, and also The operator can reduce the polishing rate by avoiding the occurrence of grinding roller marks, and can effectively improve the grinding efficiency and the work roll turnover rate, so that the object of the present invention can be achieved. The present invention is not limited by the scope of the invention, and the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are still covered by the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a state in which a work roll is subjected to a grinding operation on a grinding machine; Fig. 2 is a schematic view showing a surface condition of a work roll forming a grinding roll on the surface due to grinding flutter FIG. 3 is a flow chart 'illustrating a preferred embodiment of the method for polishing the surface quality of the present invention by using a grinding vibration inspection; FIG. 4 is a perspective view showing the vibration spectrum of each grinding pass in the grinding operation; 14 200806428 200806428

Figure § County in the gram-external-three-dimensional graph, indicating that the vibration of each grinding pass is normalized _ material condition; moving picture 6 B ~ JJ7 second eve / 疋 a plane curve, indicating the formalization steps After that, the vibration frequency spacing of the spectrum will not be equal; different! ...the plane curve diagram' indicates that after the re-sampling step, the vibration-frequency ratio of the gate-forced vibration spectrum is equal; and Figure 8 is a plane curve 狳^-grinding, and the level of the coffee level is marked on different pitches. The same spectrum can be formed in the same way. 15 200806428 [Main component symbol description]

11 θϊ·>«_ 今》* Shiba • Shake vibration step 1 - Difference spectrum step 1 St + S + K + i; * S normalization step * Resampling step 15 #**»***? * Weighted sum step 2 "«...^...•工卷今黾# Power 4£-3>S *grinding roll marks +ΪΤ + Ϊ + !£* >:Ψ ^ Grinding machine 31 «»?? 3 orders* + 'Wheel wheel ・Vibration recorder

Claims (1)

200806428, the scope of application for patents: ι· A method of grinding the surface quality by grinding vibration inspection, the following steps are taken by the sentence person: - taking the vibration step, using the vibration record β ' installed on a grinding machine Take the vibration signal when the worker is in the ancient and the jin has the grinding pass; a calculation of the spectrum step, Jiang Li>,, f mother-grinding the vibration signal is converted into the vibration spectrum; the man-normalization step, I _ rtT —, , The vibration spectrum of the grinding channel is normalized and converted with respect to the light rotational speed of =, so that the vibration spectrum with the same pitch in the front and rear grinding channels will be correspondingly arranged; a resampling step, | _ π , , ^ ^ mother grinding this time after the normalization of the vibration frequency re-sampling, 佶χ, flowers so that the same pitch vibration frequency interval is equal; and I shell A - plus (four) and steps ' Multiply the re-sampling vibration spectrum by -1 to push the weight, so that the higher the index weight, the higher the index weight of all the grinding passes. * To a Εθ ϊ \ ι Yin - the righteousness% do not work the severity of the grinding roller marks roll surface quality indicators. 2 · According to the scope of the patent application, the grinding surface is used to grind the surface quality of the grinding roller, the soil ^ , , , , , , , , , in the normalization step, in each of the grinding After the normalization of the vibration spectrum, it will correspond to the respective pitch fields. The pitch field is obtained by the following formula: m 17 200806428 where 'vibration frequency grinding pass point 7~ corresponding to the 7th grinding The passage, / represents the representative of the work roll to turn j, is (7) represents the vibration frequency of the / / grinding pass, / 〇. 3 · according to the patent application of the surface quality of the surface of the grinding ~ 疋 meaning for: around the second The use of the grinding vibration inspector light method "where the index weight of the weighted sum step /=1 ("-,· +1, Where π represents the total number of grindings and 々 represents the weight control parameters. 4. A method of using a grinding vibration to inspect a surface quality of a work roll according to the third aspect of the patent application, wherein in the resampling step, the vibrational spectral interval of each grinding pass is resampled by a linear internal difference method. , make it the same, in order to facilitate the weighted summation step. Pass 18