CN114354359A - Detection device and detection method for polishing and grinding wires - Google Patents
Detection device and detection method for polishing and grinding wires Download PDFInfo
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- 238000005498 polishing Methods 0.000 title claims abstract description 125
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000011156 evaluation Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 27
- 230000001133 acceleration Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000010606 normalization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention relates to a detection device and a detection method of a polishing and grinding wire, which calculate the fluctuation degree of instantaneous output power of two adjacent mark points in each section to obtain the fluctuation degree sequence of the polishing and grinding wire of each section and the fluctuation degree of each section; collecting the incoming line speed and the outgoing line speed of each marking point and the corresponding time from incoming line to outgoing line; calculating the stretching distance of the polishing and grinding wire based on the stretching time and the speeds at the two ends; obtaining a stretching rate sequence of each marking point in each section based on the stretching distance and the distance between the wire inlet and the wire outlet, and obtaining the stretching efficiency of each section of polishing and grinding wire; obtaining the stretching degree according to the fluctuation degree and the stretching efficiency of each section of polishing and grinding wire; and evaluating each section of polishing and grinding wire based on the stretching degree of each section of polishing and grinding wire to obtain a corresponding detection result. The scheme of the invention can detect the stretching condition of the polishing and grinding wire to obtain the stretching result of the grinding wire, and is beneficial to the subsequent evaluation of the quality condition of the grinding brush.
Description
Technical Field
The invention relates to the field of detection of grinding brushes, in particular to a detection device and a detection method for polishing and grinding wires.
Background
For the alkali-resistant and high-temperature-resistant polishing and grinding wire, because the polishing and grinding wires in different batches have different production processes (such as errors of material proportions and errors of production conditions), the stretching quality of the polishing and grinding wire is different under the same working condition when the polishing and grinding wire is stretched, so that how to better monitor the stretching quality of the polishing and grinding wire and adaptively adjust the working condition parameters of the stretching treatment is particularly important.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a device and a method for detecting polishing/grinding threads, which are used to solve the problem of different tensile qualities of polishing/grinding threads in different batches.
A detection method of polishing and grinding wires comprises the following steps:
the method comprises the steps of obtaining the instantaneous output power of each mark point when each section of polishing and grinding wire in a set time period is stretched, calculating the fluctuation degree of the instantaneous output power of two adjacent mark points in each section to obtain a fluctuation degree sequence of each section of polishing and grinding wire, and obtaining the fluctuation degree of each section based on the fluctuation degree sequence;
collecting the wire inlet speed and the wire outlet speed of each marking point when each section of polishing and grinding wire is stretched and the corresponding time from wire inlet to wire outlet; calculating the stretching distance of the polishing and grinding wire based on the time and the speeds at the two ends; obtaining a stretching rate sequence of each marking point in each section based on the stretching distance and the distance between the wire inlet and the wire outlet, and obtaining the stretching efficiency of each section of polishing and grinding wire based on the stretching rate sequence;
obtaining corresponding stretching degrees according to the fluctuation degree and the stretching efficiency of each section of polishing and grinding wire; and evaluating each section of polishing and grinding wire based on the stretching degree of each section of polishing and grinding wire to obtain a corresponding detection result.
Further, the specific process of evaluating each section of polishing and grinding wire is as follows:
clustering the polishing and grinding wires of each section according to the stretching degree to obtain different categories;
and judging each category based on the set threshold interval to obtain detection results corresponding to different categories.
Further, the set threshold comprises a high set threshold interval, a medium set threshold interval and a low set threshold interval;
the category in which the maximum stretching degree and the minimum stretching degree in each category both belong to a high-setting threshold interval is high-quality stretching;
the category of which the maximum stretching degree and the minimum stretching degree in all categories belong to a middle set threshold interval is medium quality stretching;
the category in which the maximum stretching degree and the minimum stretching degree in each category both belong to a low set threshold interval is low-quality stretching;
the type in which the maximum stretching degree and the minimum stretching degree in each type do not belong to the set threshold section is the defective stretching.
Further, the method also comprises the step of processing the stretching degree of each section of polishing and grinding wire to obtain the stretching evaluation value of each section of polishing and grinding wire:
obtaining the confidence coefficient of the stretching distance of each section of polishing and grinding wire and the corresponding acceleration during stretching;
determining the tensile evaluation value of each section of polishing and grinding wire based on the confidence coefficient and the acceleration;
and evaluating each section of the polishing and grinding wire based on the tensile evaluation value.
Further, the confidence is the similarity between the stretching distance of all the marking points of each section of polishing and grinding wire and the corresponding set stretching distance.
The invention also provides a detection device for the polishing and grinding wire, which comprises a memory and a processor, wherein the processor is used for executing the steps of the detection method for the polishing and grinding wire stored in the memory.
The invention has the following beneficial effects:
the scheme of the invention is that the fluctuation degree sequence of the instantaneous output power of all sections of polishing and grinding wires is adopted; meanwhile, the speed of a wire inlet and the speed of a wire outlet and the corresponding time from wire inlet to wire outlet when each section of polishing and grinding wire is stretched are collected; calculating the stretching distance of the polishing and grinding wire based on the time and the speeds at the two ends; obtaining the stretching efficiency of the polishing and grinding wire based on the stretching distance and the distance between the wire inlet and the wire outlet, and further obtaining the stretching efficiency sequences of all sections of polishing and grinding wires; the fluctuation degree sequence and the stretching efficiency sequence are utilized to respectively obtain the stretching degrees of the grinding wires of the corresponding sections for detecting the stretching quality of the grinding wires, namely, the scheme of the invention can realize the analysis of the stretching quality of the grinding wires on the grinding brush, and provides a new detection angle for the subsequent qualified detection of the grinding brush quality.
Meanwhile, the tensile quality of the grinding wire can be more accurately analyzed by correcting the tensile degree.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for inspecting polished and ground wires according to the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the embodiments, structures, features and effects thereof according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following describes a specific scheme of the detection method of the polishing and grinding wire provided by the invention in detail with reference to the accompanying drawings.
The invention aims at the following scenes: the machine tool part is used for stretching the polishing and grinding wires, wherein the polishing and grinding wire stretching treatment is one part in the production of the polishing and grinding brush, namely the polishing and grinding wires form the grinding brush, and the better the stretching quality of the polishing and grinding wires is, the better the quality of the grinding brush is, so that the stretching detection of the polishing and grinding wires can provide corresponding basis for the subsequent quality evaluation of the polishing and grinding brush.
Specifically, referring to fig. 1, a flow chart of steps of a method for detecting polishing grinding wires according to an embodiment of the present invention is shown, wherein the method comprises the following steps:
step 1, acquiring the instantaneous output power of each mark point when each section of polishing and grinding wire is stretched, calculating the fluctuation degree of the instantaneous output power of two adjacent mark points to obtain the fluctuation degree sequence of each section of polishing and grinding wire, and obtaining the fluctuation degree of each section based on the fluctuation degree sequence.
The polishing and grinding wires in each section are based on a set time period, and the polishing and grinding wires in the initial section, the second section, … and the j section are marked in the set time period respectively; marking means is to mark a section of polishing and grinding wire at a certain interval in advance, wherein the interval is the distance between parts of a drawing machine tool, and different points are marked on each section of polishing and grinding wire at the same time, namely different points are marked at set intervals; in this embodiment, the instantaneous output power of each marking point of each section of polishing and grinding wire in the drawing process is obtained, and the power P is recordedj＝{p1，…，piAnd i is the number of the marked points.
The fluctuation degree of each section of the polishing and grinding wire in this embodiment can be calculated by as the mean value of the difference value of the fluctuation degrees of the instantaneous powers of two adjacent marking points in each section, or by the following method: the absolute value of the difference value between the power mean value of each mark point of the current section and the power mean value of each mark point of the previous section is calculated, and the ratio of the standard deviation of the instantaneous output power of each mark point of the grinding wire of the current section to the absolute value of the difference value is used as the fluctuation degree of the section.
Wherein,
is for the power fluctuation in the j section polishing and grinding wireThe STD function is the standard deviation. The larger the value, the more stable the power variation. And vice versa. | mean (P)j)-mean(Pj-1) L expresses the degree of change in the power of the j segment; in this embodiment, the evaluation of the intensity of the change of the last time can be obtained by using the difference of the mean values of the adjacent time sequences. The smaller the value thereof, the smaller the change in instantaneous power is considered; otherwise, the change of the instantaneous power is considered to be larger.
It should be noted that, when the fluctuation degree is a difference, normalization processing needs to be performed on the difference, so as to obtain a fluctuation degree sequence of each section of polishing and grinding wire in a set time period.
In the drawing process of the burnishing and grinding wire, because of the difference error of the material proportion in the previous stage, when the drawing process is carried out, the partial drawing is too large, and the partial drawing is too small, therefore, the instantaneous power of the conveying motor during the drawing process is considered, and when the instantaneous power is larger, the possibility that the burnishing and grinding wire is broken is higher.
Step 2, collecting the wire inlet speed and the wire outlet speed of each marking point when each section of polishing and grinding wire is stretched and the stretching time from the wire inlet to the wire outlet when the polishing and grinding wire is stretched; calculating the stretching distance of the polishing and grinding wire based on the stretching time and the speeds at the two ends; and obtaining a stretching rate sequence of each mark point in each section based on the stretching distance and the distance between the wire inlet and the wire outlet, and obtaining the stretching efficiency of each section of the polishing and grinding wire based on the stretching rate sequence.
In the embodiment, the speed sensors are used for acquiring the speed of two ends of the machine tool part for stretching to obtain the speed of the wire inlet and the speed of the wire outlet, and the stretching time t of each section of polishing and grinding wire is recorded0＝{t1，..,tiAnd obtaining a stretching distance based on the speeds of the two ends and the stretching time of the corresponding polishing and grinding wire.
The speed of the wire outlet and the speed of the wire inlet are respectively v0,v1(ii) a It should be noted that the speed of the outlet and inlet of the polishing and grinding wire is determined by the machine tool, wherein the outlet speed also needs to be combined with different diamonds and oxygen by the practitionerThe toughness of the high-temperature-resistant alkali-resistant polishing grinding wire with the aluminum content is determined by the self. Meanwhile, the speed of the wire outlet and the speed of the wire inlet of each section of polishing and grinding wire are consistent, so that the consistency of stretching treatment can be theoretically ensured.
The stretch ratio of each mark point in this example is:
wherein S is0Is the distance between the wire inlet and the wire outlet, i.e. the distance between the two ends of the stretching machine tool part, tiThe stretching time of the ith marking point of one section of the polishing grinding wire is used.
And calculating the average value of the stretching rate of each section of polishing and grinding wire to be used as the stretching efficiency of each section of polishing and grinding wire, and further obtaining the stretching efficiency sequence of all sections of polishing and grinding wires in a set time period.
Step 3, obtaining corresponding stretching degrees according to the fluctuation degrees and the stretching efficiency of the polishing and grinding wires of each section; and evaluating each section of polishing and grinding wire based on the stretching degree of each section of polishing and grinding wire to obtain a corresponding detection result.
In this embodiment, the product of the fluctuation degree and the drawing efficiency of each section of the polishing and grinding wire is calculated and used as the drawing degree of the corresponding section of the polishing and grinding wire, and each section of the polishing and grinding wire is evaluated.
The stretching degree is calculated in the invention, and the stretching is influenced by the fluctuation of the instantaneous output power, so that the stretching condition of the polishing and grinding wire can be comprehensively considered by combining the stretching degree with the stretching efficiency.
The specific process for evaluating each section of polishing and grinding wire comprises the following steps:
classifying the sections of polishing grinding wires according to the stretching degree of the sections of polishing grinding wires and by combining a clustering method to obtain different categories; and judging each category based on the set threshold interval to obtain detection results corresponding to different categories.
The clustering method comprises the steps of dividing each section of polishing and grinding wires by using a DBSCAN algorithm; specifically, a search radius r is set to search the radius r for clustering. The radius r can be adjusted according to the requirements of users. Of course, other clustering methods, such as KM clustering, etc., may be used. It should be noted that the categories divided in the present embodiment are four categories.
In the above, the determination of each category based on the set threshold interval is:
the category in which the maximum stretching degree and the minimum stretching degree in each category both belong to a high-setting threshold interval is high-quality stretching;
the category of which the maximum stretching degree and the minimum stretching degree in all categories belong to a middle set threshold interval is medium quality stretching;
the category in which the maximum stretching degree and the minimum stretching degree in each category both belong to a low set threshold interval is low-quality stretching;
the type in which the maximum stretching degree and the minimum stretching degree in each type do not belong to the set threshold section is the defective stretching.
The set threshold interval comprises a high set threshold interval, a middle set threshold interval and a low set threshold interval, and is a standard threshold interval which is acquired through historical normal data and accords with different stretching standards.
Further, the method also comprises the step of processing the stretching degree of each section of polishing and grinding wire to obtain the stretching evaluation value of each section of polishing and grinding wire: firstly, acquiring corresponding acceleration of each section during stretching; and obtaining the confidence of each section based on the stretching distance of each marking point in each section.
The confidence of the stretching distance in the above steps is:
and calculating the similarity between the stretching distance and the empirical stretching distance, wherein the empirical stretching distance is the empirical stretching distance of each mark point obtained according to historical empirical data, namely the stretching distance is closer to the empirical stretching distance when being similar to the empirical stretching distance, and the stretching distance is more in line with the requirement.
Of course, as another embodiment, a straight line fitting is performed according to the known stretching normal data or the currently acquired stretching distance, and the confidence is determined.
Specifically, by taking the currently obtained stretching distance as an example, the stretching distances of all the mark points of all the sections of polishing and grinding wires are fitted to obtain a fitted straight line, and a corresponding fitted stretching distance is obtained; and obtaining the confidence coefficient of the stretching distance according to the fitting stretching distance and the stretching distance.
In particular, based on si＝(v1-v0)tiObtaining a variation sequence S ═ S at each time1,…,siAnd fitting a straight line by using a least square method, wherein x is {1, …, i } and y is { s }1,…,si}, the slope of the line is:
based on the straight line fitted, a fitted stretch distance y ═ y is obtained1,…,yi}。
Then
Wherein,
fitting the stretch distance, s, to the ith markeriAnd (4) setting the stretching distance of the ith mark point, wherein i is the total number of the mark points in the jth section of polishing and grinding wire.
It should be noted that the Loss is an average value of the difference between the actual value and the fitted straight line, that is, the closeness between the fitted straight line and the actual stretching distance, and as the Loss approaches to 0, it is proved that the fitting degree is higher, and otherwise, it is proved that the fitting degree is lower.
And then, based on the confidence coefficient and the acceleration, correcting the stretching degree and determining the stretching evaluation value of each section of polishing and grinding wire.
The tensile evaluation values in this example are:
wherein R isjFor the degree of elongation of the j-th section of the polishing grinding wire, STD (A)j) And Q is the standard deviation of the acceleration of each marking point on the j section polishing and grinding wire, and is the confidence coefficient.
In the above ujThe method is used for correcting the stretching degree on the basis of uniform stretching of the polishing and grinding wire.
The evaluation of acceleration fluctuation means that the polishing yarn was pulled while being pulled to fluctuate vertically, that is, acceleration was generated. The larger the value, to mean the more uniform the abrasive filaments are drawn.
Q is the confidence of the draw distance, i.e. the draw of the polishing abrasive filaments over a set period of time.
Thus, the tensile evaluation value U ═ U { U } of each polished and ground wire segment was obtained1,…,uj}。
The above acceleration is collected by rotary encoders provided on the rollers at the inlet and outlet.
Of course, as another embodiment, a roller is installed on the stretching line (polishing and grinding wire), an accelerometer is installed on the central point of the roller for recording the acceleration of the roller, and then the stretching is evaluated. That is, a rolling pulley is added to the machine tool for drawing the ground yarn, and the degree of uniformity of the drawing of the cord is determined by the acceleration of the axis of the rolling pulley and used for correcting the degree of drawing.
Finally, clustering the sections of the polishing grinding wires according to the tensile evaluation values to obtain different categories; and judging each category based on the set threshold interval to obtain detection results corresponding to different categories.
The method of evaluating each category according to each tensile evaluation value in the present embodiment is the same as the method of step 3 described above, and will not be described in detail here.
The scheme of the invention is directed at the detection of the stretching of the polishing and grinding wire, namely, the polishing and grinding wire is obtained by proportioning alkali-resistant and high-temperature-resistant materials, and the uneven risk of the polishing and grinding wire during the stretching treatment can be caused due to the error of the proportioning, so that the quality of the polishing and grinding wire is poor.
The invention also provides a detection device for the polishing and grinding wire, which comprises a memory and a processor, wherein the processor is used for executing the steps of the detection method for the polishing and grinding wire stored in the memory.
In particular, since the related detection method has already been introduced in one of the above-mentioned detection methods for polishing and grinding wires, it is not described in detail herein.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A detection method of a polishing and grinding wire is characterized by comprising the following steps:
the method comprises the steps of obtaining the instantaneous output power of each mark point when each section of polishing and grinding wire in a set time period is stretched, calculating the fluctuation degree of the instantaneous output power of two adjacent mark points in each section to obtain a fluctuation degree sequence of each section of polishing and grinding wire, and obtaining the fluctuation degree of each section based on the fluctuation degree sequence;
collecting the wire inlet speed and the wire outlet speed of each marking point when each section of polishing and grinding wire is stretched and the corresponding time from wire inlet to wire outlet; calculating the stretching distance of the polishing and grinding wire based on the stretching time and the speeds at the two ends; obtaining a stretching rate sequence of each marking point in each section based on the stretching distance and the distance between the wire inlet and the wire outlet, and obtaining the stretching efficiency of each section of polishing and grinding wire based on the stretching rate sequence;
obtaining corresponding stretching degrees according to the fluctuation degree and the stretching efficiency of each section of polishing and grinding wire; and evaluating each section of polishing and grinding wire based on the stretching degree of each section of polishing and grinding wire to obtain a corresponding detection result.
2. The method for detecting polishing grinding wire according to claim 1, wherein the evaluation of each section of polishing grinding wire comprises:
clustering the polishing and grinding wires of each section according to the stretching degree to obtain different categories;
and judging each category based on the set threshold interval to obtain detection results corresponding to different categories.
3. The method as claimed in claim 2, wherein the set threshold includes a high set threshold interval, a middle set threshold interval and a low set threshold interval;
the category in which the maximum stretching degree and the minimum stretching degree in each category both belong to a high-setting threshold interval is high-quality stretching;
the category of which the maximum stretching degree and the minimum stretching degree in all categories belong to a middle set threshold interval is medium quality stretching;
the category in which the maximum stretching degree and the minimum stretching degree in each category both belong to a low set threshold interval is low-quality stretching;
the type in which the maximum stretching degree and the minimum stretching degree in each type do not belong to the set threshold section is the defective stretching.
4. The method for detecting polishing and grinding wire according to claim 1, further comprising the step of processing the tensile degree of each section of polishing and grinding wire to obtain the tensile evaluation value of each section of polishing and grinding wire:
acquiring the acceleration corresponding to each marking point during stretching of each section; obtaining the confidence of each section based on the stretching distance of each marking point in each section;
correcting the stretching degree based on the confidence coefficient and the acceleration, and determining the stretching evaluation value of each section of polishing and grinding wire;
and evaluating each section of the polishing and grinding wire based on the tensile evaluation value.
5. The method according to claim 4, wherein the polishing and grinding wire is a wire having a predetermined thickness,
the confidence coefficient is the similarity between the stretching distance of all the marking points of each section of polishing and grinding wire and the corresponding set stretching distance.
6. A polishing and grinding wire detection device comprising a memory and a processor, wherein the processor is used for executing the steps of the detection method of the polishing and grinding wire stored in the memory according to any one of claims 1 to 5.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1215634A (en) * | 1982-08-17 | 1986-12-23 | Curtis A. Mouser | Feedback controlled stretch wrapping apparatus and process |
| JPH02205747A (en) * | 1989-02-06 | 1990-08-15 | Toshiba Corp | Method for testing and evaluating metal fatigue acceleration |
| CN1656263A (en) * | 2002-05-27 | 2005-08-17 | 旭化成纤维株式会社 | Composite fiber and process for producing the same |
| CN105312359A (en) * | 2014-07-16 | 2016-02-10 | 上海梅山钢铁股份有限公司 | Strip shape control method for low-temperature annealed strip steel |
| CN207756638U (en) * | 2017-12-25 | 2018-08-24 | 西南铝业（集团）有限责任公司 | A kind of elongated article extensibility control device |
-
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- 2022-01-12 CN CN202210029454.6A patent/CN114354359B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1215634A (en) * | 1982-08-17 | 1986-12-23 | Curtis A. Mouser | Feedback controlled stretch wrapping apparatus and process |
| JPH02205747A (en) * | 1989-02-06 | 1990-08-15 | Toshiba Corp | Method for testing and evaluating metal fatigue acceleration |
| CN1656263A (en) * | 2002-05-27 | 2005-08-17 | 旭化成纤维株式会社 | Composite fiber and process for producing the same |
| CN105312359A (en) * | 2014-07-16 | 2016-02-10 | 上海梅山钢铁股份有限公司 | Strip shape control method for low-temperature annealed strip steel |
| CN207756638U (en) * | 2017-12-25 | 2018-08-24 | 西南铝业（集团）有限责任公司 | A kind of elongated article extensibility control device |
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