CN111289575A - Method for detecting quality of conductive pipe bar based on relative motion - Google Patents
Method for detecting quality of conductive pipe bar based on relative motion Download PDFInfo
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Abstract
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion, and belongs to the technical field of material quality detection. The method comprises the following steps: during detection, the detection device and the conductive pipe rod can move relatively, and the quality of the conductive pipe rod is judged by continuously acquiring information and calculating information parameters; the information includes, but is not limited to, voltage, current, position, the information is continuous information; the information parameter is selected from one or more of voltage, resistance, resistivity, conductivity and conductivity; comparing the obtained actual information parameter with the standard information parameter, judging that the area corresponding to the actual information parameter has a defect when the absolute value of the actual information parameter-the standard information parameter/the standard information parameter is greater than or equal to a defect judgment threshold value, and judging that the quality of the area corresponding to the actual information parameter is qualified when the absolute value of the actual information parameter-the standard information parameter/the standard information parameter is less than the defect judgment threshold value.
Description
Technical Field
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion, belonging to the technical field of material quality detection, in particular to the technical field of continuous material quality detection.
Background
With the development of national economy, the production capacity of the conductive tube bar in China is continuously expanded, and the production categories are continuously widened. However, due to the lack of an effective online detection and monitoring system, the quality of the produced conductive tube rod is not guaranteed, and thus, the competitiveness of China in the high-end field of conductive tube rod production is lacked. The online detection system for defects in the production process of the conductive pipe rod is established, the product quality is improved by accurately feeding back and controlling the production process, and the online detection system is always a very concerned problem for conductive pipe rod production units in China. The most used online detection method for the defects of the conductive pipe rods at present comprises the following steps: eddy current detection and image-based surface quality detection, but both have application limitations: the former has high sensitivity for detecting the defects of cracks, scratches, inclusions, pits and the like on the surface of a product, but the method needs enough time for heating to fully expose the defects, has low response speed and is not suitable for being applied to a high-speed production line; the latter can accurately detect the surface defects of the conductive pipe rod, but can not detect the conductive pipe rod with internal defects. The methods are all limited by respective principles, high-temperature treatment means such as annealing and the like are often involved in the production process, the detection facilities cannot be arranged in the whole production line, and a 'blind spot' exists in detection and control. Patent CN201310530795.2 discloses a resistance testing device capable of measuring the resistance change of a sample in a temperature-changing environment, but the patent does not relate to information collection and analysis, and the measured area is fixed.
The detection device and the conductive pipe rod can move relatively, the quality information of the conductive pipe rod can be continuously collected, and systematic calculation and analysis are carried out based on the collected continuous information, so that defect judgment and quality detection are realized. The invention can detect the moving or static conductive tube rod, can realize the continuous detection of the conductive tube rod and the discrete detection, and has all the functions of the existing discrete detection technology.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for detecting the quality of a conductive pipe rod based on relative motion.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; during detection, the detection device and the conductive pipe rod can move relatively, and the quality of the conductive pipe rod is judged by continuously acquiring information and calculating information parameters; the information comprises but is not limited to voltage, current and position, the information is continuous information, and the continuous information is information for continuously acquiring different positions of the conductive pipe rod; the information parameter is selected from one or more of voltage, resistance, resistivity, conductivity and conductivity; comparing the actual information parameter with the standard information parameter, judging that the area corresponding to the actual information parameter has a defect when the absolute value of the actual information parameter-the standard information parameter/the standard information parameter is greater than or equal to a defect judgment threshold, and judging that the quality of the area corresponding to the actual information parameter is qualified when the absolute value of the actual information parameter-the standard information parameter/the standard information parameter is less than the defect judgment threshold.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the relative movement of the detection device and the conductive pipe rod comprises the following three conditions: the detection device is static, the conductive tube rod moves, the reverse direction of the movement direction of the conductive tube rod is defined as the detection direction, and the detection device is mainly used for detecting the quality of the conductive tube rod produced by the process; the detection device moves, the conductive pipe rod is static, the movement direction of the detection device is defined as the detection direction, and the detection device is mainly used for detecting the conductive pipe rod which is difficult to move; the detection device and the conductive pipe rod move at different speeds simultaneously, the reverse direction of the conductive pipe rod relative to the movement direction of the detection device is defined as the detection direction, and the detection device and the detection method are mainly used for assisting in adjusting the information acquisition frequency and detecting a specific area; the relative movement is preferably a continuous relative movement.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the information includes but is not limited to voltage, current and position, and the acquisition method of the voltage and current information includes but is not limited to direct current four-point method, single bridge method and double bridge method. Preferably a direct current four point process.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the detection device is contacted with the conductive tube rod through contact ends, and the contact area of any one contact end and the conductive tube rod is less than or equal to 100mm2Preferably 25mm or less2More preferably 1mm or less2More preferably 0.25mm or less2The selection of this parameter is related to the accuracy of the detection, and for high-end detection it is preferable to choose the preferred scheme while ensuring the physical performance, of course, in order to achieve thisThe reliability of the information is further improved, and the contact areas of the two contact ends for information acquisition and the conductive tube rod are equal.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the distance between the 2 information acquisition contact ends is less than or equal to 1500mm, preferably less than or equal to 1000mm, more preferably less than or equal to 500mm, and even more preferably less than or equal to 100 mm.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; a material area between the 2 information acquisition contact ends is an information acquisition area, the 1 st information acquisition contact end in the detection direction is defined as a positioning contact end, the state of the acquired 1 st information is defined as an initial state, and the position of the conductive tube rod in contact with the positioning contact end is an information acquisition starting point (coordinate origin) in the initial state; the origin of coordinates can also be manually set and changed; after the coordinate origin is set, the positions of other points on the conductive pipe rod are represented by the distance between the conductive pipe rod and the coordinate origin.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the detection device automatically acquires information in the process that the conductive pipe rod enters and exits the information acquisition area, and automatically draws an information parameter-distance curve; the abscissa of the information parameter-distance curve is the distance between the contact position of the conductive tube bar and the positioning contact end and the information acquisition starting point; the distance may be obtained by direct measurement, or by calculation based on time and velocity parameters.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the acquired information can also comprise time and temperature information, and when the acquired information comprises time information, a continuous information parameter-position-time curve can be obtained according to the acquired information parameters, the position information and the time information.
Those skilled in the art can obtain the information and perform mathematical processing, theoretical calculation and physical meaning transformation according to the present invention, and the essence of the invention also belongs to the scope of the present invention.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the information parameter-distance curve reflects the quality information of the conductive pipe bar, and the information parameter-distance curve is abnormal and returns to normal to reflect that defects enter and leave the information acquisition area. FIG. 1 is a schematic diagram of an information parameter-distance curve corresponding to a defect and a position of a conductive pipe rod, a starting point (O point) of the information parameter-distance curve is obtained according to the collected 1 st information, the distance between the corresponding position of the O point on the conductive pipe rod and the information collection starting point is 0, and the abscissa of the O point is 0; the state A is a state that 1 defect is about to enter an information acquisition area, when the conductive tube bar moves from an initial state to the state A, no defect exists in the information acquisition area, an information parameter-distance curve correspondingly appears in an OA section, the information parameter is in a normal state, the distance between the corresponding position of a point A on the conductive tube bar and an information acquisition initial point is 50mm, and the abscissa of the point is 50 mm; the state B is a state that 1 defect just completely enters the information acquisition area, when the conductive tube rod moves from the state A to the state B, the defect goes through the processes of starting to enter and completely entering the information acquisition area, an AB section correspondingly appears on an information parameter-distance curve, the information parameter is an abnormal information parameter, the distance between the corresponding position of a point B on the conductive tube rod and the information acquisition starting point is 60mm, and the abscissa of the point is 60 mm; the C state is a state that the defect is about to leave the information acquisition area, when the conductive pipe rod moves from the B state to the C state, a BC section correspondingly appears on an information parameter-distance curve, the distance between the corresponding position of a point C on the conductive pipe rod and the information acquisition starting point is 90mm, and the abscissa of the point is 90 mm; the D state is a state that the defect just leaves the information acquisition area, when the conductive pipe rod moves from the C state to the D state, the information parameters return to normal, the distance between the corresponding position of the point D on the conductive pipe rod and the information acquisition starting point is 100mm, and the abscissa of the point is 100 mm.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; in a few cases, when the front end of the measured conductive pipe rod has a defect, the information parameter of the information parameter-distance curve starting point is abnormal, or when the tail end of the measured conductive pipe rod has a defect, the information parameter of the information parameter-distance curve ending point is abnormal.
Hair brushA method for detecting the quality of a conductive pipe rod based on relative motion is disclosed; t for the defect judgment thresholdrDenotes that when the resulting information parameter is voltage and the unit used is V, the T isrThe value of (a) is greater than or equal to 0.0001, preferably 0.0001 to 0.1, more preferably 0.0001 to 0.01, and even more preferably 0.0001 to 0.001; when switching between information parameters, the TrAnd carrying out corresponding conversion on the value of (A).
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; quality analysis can be carried out according to the information parameter-distance curve, the actual position and the defect length of the defect on the conductive tube rod can be determined according to the abscissa of the starting point and the ending point of the regression normal of the information parameter, and the significance degree of the defect can be determined according to the difference value of the maximum value (or the minimum value) of the information parameter and the standard information parameter; FIG. 2 is a diagram of information parameter versus distance, with the actual information parameter being represented by Y and the standard information parameter being represented by YsIs represented by Ys±(Tr×Ys) For the normal information parameter range, the error range mainly takes the measurement error of the system into consideration. As shown in FIG. 2, | Y-Y of the AB segment and BC segments|＜Tr×YsThe method shows that the corresponding conductive tube bar interval is free of defects, and the actual information parameter Y at the C point meets the condition of Y-Ys|＝Tr×Ys，Y＝YCThe actual information parameter is at a critical value; the actual information parameter of the CD segment exceeds the normal range, | Y-Ys|≥Tr×YsGradually entering an information acquisition area corresponding to the defect; the actual information parameter of the DF segment is relatively constant, the corresponding defect is completely positioned in the information acquisition area, YmIs the maximum value of the actual information parameter; the actual information parameters of the FG section start to return, the corresponding defects gradually leave the information acquisition area, the position of the point F on the conductive pipe rod is the starting point of the defects, and the actual information parameter value Y of the point G meets the requirement of | Y-Ys|＝Tr×Ys，Y＝YGThe actual information parameter is at a critical value, and the corresponding position of the point G on the conductive pipe rod is a defect termination point; actual information parameters of the GH section and the HI section satisfy Y-Ys|＜Tr×YsIn the normal informationA range of numbers indicates that the corresponding conductive bar region is defect free.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; when the actual information parameter/standard information parameter is greater than or equal to TrThen, the measured region is judged to include at least 1 or 1 defect, and T is calculatedySaid T isy＝(Ym-Ys)÷YsSaid Y issIs a standard information parameter, said YmIs the maximum or minimum value of the actual information parameter, TyIs a defect determination factor.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; defects that cause a change in the resistance of a material, including but not limited to a change in the resistivity of the material, a change in cross-sectional area; when the defect is of a type in which the sectional area becomes smaller, the sectional area becomes smaller to cause the resistance to become larger, and the corresponding resistance value increases, as shown in fig. 3, YmIs the maximum value of the continuous resistance obtained, Ym＞Ys，TyIs greater than 0; when the defect is of a type having a larger cross-sectional area, the larger cross-sectional area results in a smaller resistance, and the corresponding resistance value decreases, as shown in fig. 4, YmIs the minimum value of the continuous resistance obtained, Ym＜Ys，Ty＜0；YmAnd YsThe difference in (b) reflects the severity of the defect.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; when the information parameter is voltage information and/or resistance and/or resistivity, Ty> 0, defect types include, but are not limited to, scratches, pits, small size, cracks, excessive wall thinning, corrosion, Ty< 0, defect species including but not limited to internal bulge, internal scab, large size, excessive wall thickness; when the information parameter is selected from conductivity and/or electric conductivity, Ty< 0, defect types include, but are not limited to, scratches, pits, undersize, cracks, excessive wall thinning, corrosion, Ty> 0, defect types include, but are not limited to, internal bulging, internal scarring, oversized, and excessive wall thickness.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the number of defects can be judged by analyzing the change condition of the information parameter-distance curve; generally, when an actual information parameter-distance curve is abnormal and returns to normal for 1 time, at least 1 or 1 defect in the corresponding area of the conductive pipe rod can be judged; in a few cases, the information parameter-distance curve is abnormal repeatedly and returns to normal or the change rate is increased or reduced suddenly, and at least 2 or 2 defects in the corresponding area of the conductive pipe rod can be judged; in rare cases, the information parameter-distance curve is abnormal and returns to normal repeatedly, and finally the normal parameter range can not be returned, and a large number of defects exist in the corresponding area of the conductive pipe rod or the corresponding area of the conductive pipe rod is judged to be a physical boundary.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the method can detect the continuous occurrence of various defects, and judge whether the information acquisition area has 2 or more than 2 defects according to the slope of the information parameter-distance curve and the change condition of the slope if the information parameter-distance curve is abnormal and does not return for a long time or does not return until the detection is finished.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; there are many defect determination methods, and any defect determination method based on the present invention is considered to fall within the scope of protection of the present patent.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the standard information parameters are information parameters of a standard sample, the standard sample can be determined according to standards, and the standards are national standards, industry standards or enterprise standards.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the standard sample information parameters can also be determined by a user, or obtained by detection and/or calculation according to a standard sample determined by the user.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; when standard information parameters are acquired, the detection environment is the same as the actual detection environment, and the detection environment includes but is not limited to temperature, pressure, humidity and noise.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the cross-sectional area of the conductive tube rod is less than or equal to 2000mm2Preferably 200mm or less2More preferably 20mm or less2Still more preferably not more than 2mm2More preferably 1mm or less2。
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the applicable temperature range is 10K-the melting temperature or the liquefaction temperature or the gasification temperature of the conductive tube rod material to be measured.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; during detection, the relationship among the information acquisition frequency, the relative movement speed between the detection device and the conductive tube rod and the information acquisition contact end distance is as follows: the relative movement speed/information acquisition frequency is less than the distance between the information acquisition contact ends, so that all areas of a detection sample can be detected, the acquired information sample is enough for analysis, and the smaller the relative movement speed is, the larger the acquisition frequency is, and the more the acquired information sample is; the information acquisition frequency is equal to or greater than 1/10 seconds, preferably equal to or greater than 1/second, and more preferably equal to or greater than 10/second.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; the information acquisition frequency can also be set according to the length of the information acquisition area, and the information acquisition number is more than or equal to 1 time, preferably more than or equal to 10 times, and more preferably more than or equal to 100 times within a 10mm detection interval; and the information acquisition frequency can be optimized and adjusted according to the relative movement speed of the conductive pipe rod and the detection device and the characteristics of the information acquisition device.
The invention relates to a method for detecting the quality of a conductive pipe rod based on relative motion; when the defect enters and leaves the information acquisition area, the corresponding information parameter curve has a certain mapping relation, and the information acquisition system can be checked according to the mapping relation. In fig. 2, the BD segment corresponds to the defect entering the information collecting area, the FH segment corresponds to the defect leaving the information collecting area, and the information parameters of the BD segment and the FH segment are ideally mapped to each other, i.e. for any point (X, Y) on the BD(X)) And mapped point on FH (X + l, Y)(X+l)) Existence of a relationship Y(X)'＝-Y(X+l)', where l is the length of the information-collecting region.
The invention also specially designs a device matched with the detection method; the device comprises P independent detection units, and the P units can be completely or partially contacted with the conductive pipe rod during detection; the detection unit can be static or move according to a designed track, and the conductive pipe rod can also be static or move according to a designed track; the detection unit and the conductive pipe rod can move relatively; and P is an integer greater than or equal to 1.
The invention relates to a device for detecting the quality of a conductive pipe rod based on relative motion; when the information parameters are detected by adopting a direct current four-point method, each detection unit comprises 4 binding posts which are arranged side by side, a constant current providing module, a temperature measuring module and an information acquisition module; two binding posts at two ends of the 4 binding posts are connected with the constant current providing module through a lead, and two binding posts in the middle are connected with the information acquisition module through leads; the temperature measurement module is connected with the information acquisition module.
The invention relates to a device for detecting the quality of a conductive pipe rod based on relative motion; the binding post is connected with the contact end, and the electric conductivity of the binding post is more than or equal to 10% IACS, preferably more than or equal to 50% IACS, and more preferably more than or equal to 80% IACS; the contact end includes but is not limited to a conductive ball and a probe, and when in use, the conductive tube rod is in contact with the contact end and has relative movement.
The invention relates to a device for detecting the quality of a conductive pipe rod based on relative motion; and a pressure sensing device is arranged between the binding post and the contact end and is used for adjusting the contact pressure of the binding post and the detection sample so as to prevent the detection sample from being damaged due to overlarge contact pressure or poor contact due to undersize contact pressure.
After the device is optimized, the quality of the inner wall of the pipe can be detected.
Compared with the prior art, the invention provides a scheme for detecting the quality of a conductive tube rod based on relative motion, which has the technical advantages that:
1. the invention can realize the continuous on-line detection of the conductive pipe rod, and the detection device and the conductive pipe rod can have various relative movement modes, thereby having great practical value for the continuous on-line detection.
2. The invention can be suitable for different detection places, can detect various materials, can realize online detection in different temperature environments, and can convert continuous information parameters at different temperatures.
3. The invention can detect the defect causing the resistance change and analyze the type of the defect, not only can detect the quality problem of the surface layer, but also can detect the internal defect, especially can detect the coexistence situation of 2 or more than 2 defects, and the prior art can not realize the function.
Drawings
FIG. 1 is a schematic diagram of an information parameter-distance curve corresponding to a defect and a position of a conductive pipe rod;
FIG. 2 is a schematic diagram of information parameter-distance;
FIG. 3 is a schematic diagram of a resistance-distance curve for a defect with a decreasing cross-section;
FIG. 4 is a schematic resistance-distance curve of a defect with a larger cross-section;
FIG. 5 is a schematic view of the detection apparatus of the present invention, wherein 1 is a signal acquisition module; 2 is a binding post; 3 is a binding post lifting device; 4 is a pressure sensor; 5 is a temperature measuring probe; 6 is a signal lead; 7 is a contact end;
FIG. 6 is a photograph of a test sample in example 1;
FIG. 7 is a conductivity-distance curve of example 1;
FIG. 8 is a photograph of a test sample in example 2;
FIG. 9 is a graph of conductivity versus distance for example 2;
FIG. 10 is a photograph of a defect in example 2;
FIG. 11 is a voltage-distance curve of example 3;
FIG. 12 is a photograph of a defect in example 3;
FIG. 13 is a voltage-distance curve of comparative example 1.
Detailed Description
In the specific embodiment of the invention, the four-point method is adopted for detection. In the following embodiments, the detection environment temperature is 20 + -2 deg.C, and the contact area between the contact end and the conductive tube rod is less than or equal to 5mm2. The detection system automatically acquires voltage information, position information and size information in the relative motion of the conductive pipe rod and the detection device, automatically calculates information parameters and draws an information parameter-distance curve.
The information parameter calculation adopts the following formula:
resistance (Ω) is voltage (V) ÷ current (a);
resistivity (Ω · m) is resistance (Ω) × cross-sectional area (m)2) Length (m);
conductivity (S/m) ÷ 1 ÷ resistivity (Ω · m);
electrical conductivity (% IACS) — electrical conductivity (MS/m) ÷ 0.58.
Example 1:
detection materials: t2 red copper bar with diameter of 7.92mm and length of 305mm, FIG. 6 is a photograph of a sample to be tested;
post spacing/information collection area length: 30 mm;
inputting a constant current: 1.3A;
the motion mode is as follows: the detection device is static, and the sample moves;
the moving speed of the sample is as follows: 30 mm/s;
signal acquisition frequency: 20 times/s;
standard conductivity: 99.8% IACS;
FIG. 7 shows the conductivity-distance curve, T, obtainedr0.003, according to | actual conductivity-standard conductivity |/standard conductivity < TrAnd judging that no defect exists and the sample is qualified.
Example 2
Detection materials: stainless steel pipe with 20mm outer diameter, 18mm inner diameter and 23cm length, and FIG. 8 is a photograph of a detection sample;
post spacing/information collection area length: 50 mm;
inputting a constant current: 2.3A;
the motion mode is as follows: the detection device is static, and the sample moves;
the moving speed of the sample is as follows: 30 mm/s;
signal acquisition frequency: 30 times/s;
standard conductivity: 0.139 MS/m;
FIG. 9 is a graph of the obtained conductivity vs. distance, Tr0.0144, according to | actual conductivity-standard conductivity |/standard conductivity ≧ TrAnd judging that 2 defects exist. The conductivity in the position range of 19mm-20mm is abnormally reduced, and the defect corresponding to the 1 st position enters an information acquisition area, Ym1The conductivity returns to normal within the position range of 69mm-70mm (0.132 mMS/m), the corresponding defect leaves the information acquisition area, the distances between the starting point and the ending point of the defect and the information acquisition starting point are 69mm and 70mm respectively, the length of the defect area is determined to be 1mm, and a defect judgment factor T is used for judging whether the defect exists or noty1(0.132-0.139) ÷ 0.139 ═ -0.0504, due to Ty1If the defect type is less than 0, judging that the defect type is a small size or a pit; the conductivity in the 125mm-127mm position range rises abnormally, corresponding to the 2 nd defect entering the information acquisition area, Ym2The conductivity returns to normal within the position range of 175mm-177mm (0.144 MS/m), the corresponding defect leaves the information acquisition area, the distances between the starting point and the ending point of the defect and the starting point of the information acquisition are respectively 175mm and 177mm, the length of the defect area is determined to be 2mm, and a defect judgment factor T is used for judging whether the defect exists in the defect areay20.144-0.139/0.0360, due to Ty2And if the defect type is larger than 0, judging that the defect type is larger in size.
FIG. 10 shows a photograph of a sample well, where there is a defect at a corresponding position, a pit defect may be caused by corrosion, and another defect is a large thickness dimension.
Example 3
Detection materials: the diameter of the aluminum alloy bar is 5mm, and the length of the aluminum alloy bar is 800 mm;
post spacing/information collection area length: 100 mm;
inputting a constant current: 1.0A;
the motion mode is as follows: the detection device is static, and the sample moves;
the moving speed of the sample is as follows: 30 mm/s;
signal acquisition frequency: 60 times/s;
standard voltage: 0.14418 mV;
FIG. 11 shows the voltage-distance curve, T, obtainedr0.001645, according to the measured voltage signal-standard voltage signal/standard voltage signal |/standard voltage signal ≥ TrAnd judging that 1 defect exists. The voltage within the position range of 310mm-364mm is abnormally increased and enters an information acquisition area corresponding to the defect, Ym0.14635mV, the voltage in the position range of 410mm-464mm returns to normal, the corresponding defect leaves the information acquisition region, the distances between the starting point and the ending point of the defect and the information acquisition starting point are respectively 410mm and 464mm, and the length of the defect region is determined to be 54 mm; defect decision factor Ty(0.14635-0.14418) ÷ 0.14418 ═ 0.015051, since the decision factor is greater than zero and the length of the defect region is long, it is determined that the possible defect type is scratch.
It was further found that the slope of the measured voltage-distance curve in the abnormal rising and falling phases changed significantly, with a slope of about 2.98X 10 in the rising phase in the range of 310mm to 334mm-5mV/mm, in the range of 360mm-364mm, the ascending slope is about 0.00036mV/mm, in the range of 310mm-334mm, the descending slope is about-2.98X 10-5mV/mm, in the range of 460mm-464mm, the slope at the descending stage is about-0.00036 mV/mm, and the defect is judged to be composed of two types of defects, wherein the first defect has a smaller absolute value of slope and a longer length, most probably scratches, and the second defect has a larger absolute value of slope and a shorter length, most probably indentations. The length of the middle plateau between the two slopes is 26mm, indicating that the two defects are about 26mm apart, and the photograph shown in FIG. 12 shows that the defects are scratches and indentations.
Comparative example
The detection mode is as follows: carrying out segmented discrete detection;
detection materials: an aluminum alloy bar, 5mm in diameter and 800mm in length, which is the same test material as in example 3;
post spacing/information collection area length: 100 mm;
inputting a constant current: 1.0A;
standard voltage: 0.14418 mV;
FIG. 13 is a graph of measured voltage versus distance, Tr0.001645, because the distance between the middle 2 binding posts is 100mm, the measurement needs 8 times, the result of each detection is the result of averaging 100mm segments, and the measured voltage signal-standard voltage signal/standard voltage signal is equal to or more than TrJudging that the 400mm-500mm area has defects, wherein the specific degree and length of the area cannot be determined because only 8 discrete data points exist, so that the possible defect types cannot be judged; example 3 detected a defect in the 410mm-464mm area and two types of defects could be analyzed, whereas the present comparative example was not.
The comparative example shows the disadvantages of discrete detection: the method has the advantages of needing to divide in advance, having many detection times, low detection speed, unobvious signals, inaccurate positioning, being incapable of further distinguishing the types, being incapable of detecting the conditions with extremely small defects and the like.
Claims (10)
1. A method for detecting the quality of a conductive pipe rod based on relative motion is characterized in that: during detection, the detection device and the conductive pipe rod can move relatively, and the quality of the conductive pipe rod is judged by continuously acquiring information and calculating information parameters; the information comprises but is not limited to voltage, current and position, the information is continuous information, and the continuous information is information for continuously acquiring different positions of the conductive pipe rod; the information parameter is selected from one or more of voltage, resistance, resistivity, conductivity and conductivity; comparing the actual information parameter with the standard information parameter, judging that the area corresponding to the actual information parameter has a defect when the absolute value of the actual information parameter-the standard information parameter/the standard information parameter is greater than or equal to a defect judgment threshold, and judging that the quality of the area corresponding to the actual information parameter is qualified when the absolute value of the actual information parameter-the standard information parameter/the standard information parameter is less than the defect judgment threshold.
2. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1, wherein: t for the defect judgment thresholdrDenotes that when the resulting information parameter is voltage and the unit used is V, the T isrIs large in value0.0001, preferably 0.0001 to 0.1, more preferably 0.0001 to 0.01, and still more preferably 0.0001 to 0.001; when switching between information parameters, the TrAnd carrying out corresponding conversion on the value of (A).
3. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1 or 2, wherein: when the actual information parameter/standard information parameter is greater than or equal to TrThen, judging that the detected area at least comprises 1 or 1 defect; calculating TySaid T isy＝(Ym-Ys)÷YsSaid Y issIs a standard information parameter, said YmIs the maximum or minimum value of the actual information parameter, TyIs a defect judgment factor;
when the information parameter is voltage information and/or resistance and/or resistivity, Ty> 0, defect types include, but are not limited to, scratches, pits, small size, cracks, excessive wall thinning, corrosion, Ty< 0, defect species including but not limited to internal bulge, internal scab, large size, excessive wall thickness;
when the information parameter is selected from conductivity and/or electric conductivity, Ty< 0, defect types include, but are not limited to, scratches, pits, undersize, cracks, excessive wall thinning, corrosion, Ty> 0, defect types include, but are not limited to, internal bulging, internal scarring, oversized, and excessive wall thickness.
4. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1, wherein: the standard information parameters are information parameters of a standard sample, the standard sample can be determined according to standards, and the standards are national standards, industry standards or enterprise standards.
5. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1, wherein: the standard information parameter can also be determined by a user, or obtained by detection and/or calculation according to a standard sample determined by the user.
6. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 4 or 5, wherein: when standard information parameters are acquired, the detection environment is the same as the actual detection environment, and the detection environment includes but is not limited to temperature, pressure, humidity and noise.
7. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1, wherein: the cross-sectional area of the conductive tube rod is less than or equal to 2000mm2Preferably 200mm or less2More preferably 20mm or less2Still more preferably not more than 2mm2More preferably 1mm or less2。
8. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1, wherein: the continuous information acquisition method includes, but is not limited to, a direct current four-point method, a single bridge method and a double bridge method.
9. The method of claim 8, wherein the method comprises the steps of: the detection device is contacted with the conductive tube rod through contact ends, and the contact area of any one contact end and the conductive tube rod is less than or equal to 100mm2Preferably 25mm or less2More preferably 1mm or less2More preferably 0.25mm or less2。
10. The method for detecting the quality of the conductive pipe rod based on the relative motion as claimed in claim 1, wherein: the distance between the 2 information acquisition contact ends is less than or equal to 1500mm, preferably less than or equal to 1000mm, more preferably less than or equal to 500mm, and even more preferably less than or equal to 100 mm.
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| CN201811497427.1A CN111289575A (en) | 2018-12-07 | 2018-12-07 | Method for detecting quality of conductive pipe bar based on relative motion |
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| CN201811497427.1A CN111289575A (en) | 2018-12-07 | 2018-12-07 | Method for detecting quality of conductive pipe bar based on relative motion |
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