CN114646274A - Method for quantitatively analyzing surface quality of deformed steel bar based on roundness test - Google Patents
Method for quantitatively analyzing surface quality of deformed steel bar based on roundness test Download PDFInfo
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- CN114646274A CN114646274A CN202210172606.8A CN202210172606A CN114646274A CN 114646274 A CN114646274 A CN 114646274A CN 202210172606 A CN202210172606 A CN 202210172606A CN 114646274 A CN114646274 A CN 114646274A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 2
- 238000004445 quantitative analysis Methods 0.000 abstract description 8
- 238000011179 visual inspection Methods 0.000 abstract description 6
- 238000011158 quantitative evaluation Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract 1
- 238000004458 analytical method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 3
- 238000012876 topography Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2408—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring roundness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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Abstract
The invention discloses a method for quantitatively analyzing the surface quality of deformed steel bar based on roundness test. Belongs to the technical field of welding; the method comprises the following steps: 1. preparing a deformed steel bar sample so as to obtain a point cloud image of the upper surface or the lower surface and coordinates of each point; 2. removing noise points existing in the point cloud image; 3. obtaining a projection view of all points along the axial direction of the steel bar; 4. determining a reference circle; 5. calculating the distance p between each point in the set A and the center of the reference circleiAnd then calculating the roundness through a formula. The invention provides a quantitative method for evaluating the surface quality of deformed steel bar based on the test of the roundness of a base circle of the deformed steel bar, and fills the blank of the conventional quantitative evaluation method for the surface quality of the deformed steel bar. The method is superior to the prior common qualitative method of manual visual inspection, and the uncertainty of the manual visual inspection method is eliminated.
Description
Technical Field
The invention relates to the field of material analysis and test, relates to a quantitative analysis method for evaluating the surface quality of deformed steel bar, and more particularly relates to a quantitative analysis method for evaluating the surface quality of deformed steel bar.
Background
During the hot rolling of threaded steel, wear of the rolls will lead to a deterioration of the surface quality of the threaded steel. A more typical feature is that the base circle apex is significantly convex. In the production process, the surface quality is one of the bases for judging whether the roller is replaced, and meanwhile, the surface quality also influences the corrosion resistance of the steel in the subsequent storage and transportation processes. At present, the surface quality of the deformed steel bar is evaluated mainly by visual inspection of production field personnel, the method is essentially a qualitative method, cannot be quantified, and has certain uncertainty depending on the experience of operators. The quantitative method for evaluating the surface quality of the deformed steel bar is not reported in various literatures at present.
The degree of surface roughness can be generally measured using surface roughness, and test analysis methods for plane roughness have been widely reported in various documents; for the surface roughness, no universal test analysis method exists, and the difficulty lies in the determination of the reference surface. The base circle of the deformed steel bar has a cylindrical reference surface, so that the roundness of the base circle of the deformed steel bar can be used as a quantitative index for judging the surface quality. The conventional roundness analysis method is a rotary method, transverse ribs and longitudinal ribs exist on the surface of the deformed steel bar and are not complete cylindrical surfaces, the rotary method cannot be effectively implemented, and the roundness of a base circle of the deformed steel bar is not determined at present. The invention is based on a coordinate measurement method, a reference circle is determined through a specific data processing algorithm, and then the roundness is calculated. The method realizes the quantitative analysis of the roundness of the base circle of the deformed steel bar, can be used as a quantitative method for evaluating the surface quality of the deformed steel bar, and eliminates the uncertainty of a manual visual inspection method.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a quantitative method for evaluating the surface quality of deformed steel bar based on the roundness test of the base circle of the deformed steel bar, fills the blank in the field of the conventional quantitative evaluation method for the surface quality of the deformed steel bar, and is used for replacing the conventional method for manually and visually inspecting the certain quality.
The technical scheme is as follows: the invention relates to a method for quantitatively analyzing the surface quality of deformed steel bar based on roundness test, which comprises the following specific operation steps:
(1) preparing a deformed steel bar sample so as to obtain a point cloud image of the upper surface or the lower surface and coordinates of each point;
(2) removing noise points existing in the point cloud image;
(3) obtaining a projection drawing of all points along the axial direction of the steel bar;
(4) determining a reference circle;
(5) calculating the distance p between each point in the set A and the center of the reference circleiAnd then calculating the roundness through a formula.
Further, in the step (1), the prepared deformed steel bar sample has a length specification covering all the specifications of the deformed steel bar samples.
Further, in step (1), the obtaining of the point cloud image of the upper surface or the lower surface and the measured range of the coordinates of each point are as follows: the steel bars are completely covered in the radius direction; in the axial direction of the steel bars, the distance between the transverse ribs is more than or equal to 2 times of the distance between the transverse ribs.
Further, in the step (3), the step of obtaining the projection of all points along the direction of the axis of the steel bar is implemented as follows:
(3.1) determining a plane where the side face of the longitudinal rib is located, and enabling a normal vector of the plane of the longitudinal rib to be parallel to a coordinate axis z axis through rotation of the point cloud; because the axis of the steel bar is parallel to the plane of the longitudinal rib, after the steel bar is rotated, the axis of the steel bar is parallel to the xOy plane;
(3.2) determining the axis direction of the steel bar on a projection drawing of an xOy plane, and enabling the axis of the steel bar to be parallel to a y axis of a coordinate axis through rotating the point cloud around the z axis; at this time, the projection of each point along the direction of the steel bar is the (x) of the pointi,zi) And (4) coordinates.
Further, in step (4), the reference circle is determined as follows:
(4.1) deleting the longitudinal rib part and the point too close to the longitudinal rib on the projection drawing; after the removal, the shape of the projection graph is crescent; wherein, the boundary of the upper half part of the crescent is the projection of the top of the transverse rib, and the boundary of the lower half part is the projection of the base circle part;
and (4.2) acquiring coordinates of each point on the lower half part boundary of the projection drawing on the projection drawing, then performing circle fitting, and taking the obtained fitted circle as a reference circle.
Has the advantages that: compared with the prior art, the invention has the characteristics that: the invention provides a quantitative method for evaluating the surface quality of deformed steel bar based on the test of the roundness of the base circle of the deformed steel bar, and fills the blank of the conventional quantitative evaluation method for the surface quality of the deformed steel bar. The method is superior to the prior common qualitative method of manual visual inspection, and the uncertainty of the manual visual inspection method is eliminated.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a 3D topography of the surface of the deformed steel bar in an embodiment of the invention;
FIG. 3 is a projection of the surface points of the deformed steel bar along the axis of the bar in an embodiment of the present invention;
FIG. 4 is a schematic diagram of the boundaries of a projected pattern in an embodiment of the present invention;
FIG. 5 is a schematic diagram of all points in set A and the reference circle fitted in the embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in the figure, the method for quantitatively analyzing the surface quality of the deformed steel bar based on the roundness test comprises the following specific operation steps of:
1. taking a deformed steel bar sample with a certain length, and obtaining a point cloud image of the upper surface or the lower surface and coordinates of each point; the range of measurement: the steel bars are completely covered in the radius direction; in the axial direction of the steel bars, the distance between the transverse ribs is not less than 2 times;
2. removing noise points (if any) existing in the point cloud image;
3. obtaining the projection of all points along the axial direction of the steel bar can be realized by the following method:
(a) determining a plane where the side face of the longitudinal rib is located, and enabling a normal vector of the plane of the longitudinal rib to be parallel to a coordinate axis z axis through rotation of the point cloud; because the axis of the steel bar is parallel to the plane of the longitudinal rib, after the steel bar is rotated, the axis of the steel bar is parallel to the xOy plane;
(b) and determining the axis direction of the steel bar on a projection diagram of the xOy plane, and enabling the axis of the steel bar to be parallel to the y axis of the coordinate axis through rotating the point cloud around the z axis. At the moment, the casting of each point along the direction of the steel barThe shadow is (x) of the pointi,zi) Coordinates;
4. the reference circle is determined as follows:
(a) deleting the longitudinal rib part and the point too close to the longitudinal rib on the projection drawing; after the removal, the projection drawing is in a crescent shape; the boundary of the upper half part of the crescent is the projection of the top of the transverse rib, and the boundary of the lower half part of the crescent is the projection of the base circle part;
(b) acquiring coordinates of each point (for convenience, the point set is represented by a set A) on the lower half boundary of the projection drawing on the projection drawing, and then performing circle fitting to obtain a fitted circle as a reference circle;
5. calculating the distance p between each point in the set A and the center of the reference circleiThen calculating the corresponding roundness by a formula
Example 1
Intercepting a part of deformed steel bar with the phi 25 specification, wherein the deformed steel bar is produced when a finished product roller is just put on line, shooting the surface appearance (25 times of magnification) of 30mm along the axial length of a steel bar by using a 3D (three-dimensional) profilometer, and deriving the coordinates of each point as shown in (a) in figure 2;
fitting a plane on which the two longitudinal rib side faces are positioned by using an MSAC algorithm, wherein the normal vector of the plane is (-0.0436,0.000113,0.999), and calculating a rotation matrix as
After rotation, the normal vector becomes (0,0,1), the height z of the plane01.04 mm; the axial direction is (0.0175,0.9998,0) and the rotation matrix is
After rotating again, (x) for each pointi,zi) Making a scatter diagram of the coordinates, namely a projection along the axis direction of the steel bar (figure 3);
removing all zi-z0<1mm, calculating a boundary (figure 4) by using a rolling ball algorithm, and taking all points of the boundary of the lower half part to form a set A; fitting a circle center coordinate of (X) by using Pratt algorithm0,Z0) (20.70, -0.25) as shown in fig. 5;
calculate the distance of all points in set A from the circle
Calculating piThe difference between the maximum value and the minimum value of (A) is 0.15mm, which is the roundness of the threaded steel base circle surface.
Example 2
Intercepting a part of deformed steel bar with the phi 25 specification, wherein the steel passing amount of a finished roller is 250t when the deformed steel bar of the batch is produced; the surface topography (25 times magnification) was taken with a 3D profilometer 30mm along the length of the bar axis, and the topography is shown in fig. 2 (b), and visual observation shows that the surface quality has decreased compared to the sample in example 1; the roundness calculated by the method provided by the present invention was 0.29mm, which is higher than the analysis result of example 1, 0.16mm, indicating a decrease in surface quality.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention may be apparent to those skilled in the relevant art and are intended to be within the scope of the present invention.
Claims (5)
1. A method for quantitatively analyzing the surface quality of deformed steel bar based on roundness test is characterized by comprising the following specific operation steps:
(1) preparing a deformed steel bar sample so as to obtain a point cloud image of the upper surface or the lower surface and coordinates of each point;
(2) removing noise points existing in the point cloud image;
(3) obtaining projection drawings of all points along the axial direction of the steel bar;
(4) determining a reference circle;
(5) calculating the distance p between each point in the set A and the center of the reference circleiAnd then calculating the roundness through a formula.
2. The method for quantitatively analyzing the surface quality of the deformed steel bar based on the roundness test according to claim 1,
in step (1), the prepared deformed steel bar sample has a length specification covering all the specifications of the deformed steel bar samples.
3. The method for quantitatively analyzing the surface quality of the deformed steel bar based on the roundness test according to claim 1,
in the step (1), the measurement ranges of the point cloud image of the upper surface or the lower surface and the coordinates of each point are obtained: the steel bars are completely covered in the radius direction; in the axial direction of the steel bars, the distance between the transverse ribs is more than or equal to 2 times of the distance between the transverse ribs.
4. The method for quantitatively analyzing the surface quality of the deformed steel bar based on the roundness test according to claim 1,
in the step (3), the specific implementation steps of obtaining the projection of all points along the axis direction of the steel bar are as follows:
(3.1) determining a plane where the side face of the longitudinal rib is located, and enabling a normal vector of the plane of the longitudinal rib to be parallel to a coordinate axis z axis through rotation of the point cloud; because the axis of the steel bar is parallel to the plane of the longitudinal rib, after the steel bar is rotated, the axis of the steel bar is parallel to the xOy plane;
(3.2) determining the axis direction of the steel bar on a projection drawing of an xOy plane, and enabling the axis of the steel bar to be parallel to a y axis of a coordinate axis through rotating the point cloud around the z axis; at this time, the projection of each point along the direction of the steel bar is the (x) of the pointi,zi) And (4) coordinates.
5. The method for quantitatively analyzing the surface quality of the deformed steel bar based on the roundness test according to claim 1,
in step (4), the reference circle is determined as follows:
(4.1) deleting the longitudinal rib part and the point too close to the longitudinal rib on the projection drawing; after the removal, the shape of the projection graph is crescent; wherein, the boundary of the upper half part of the crescent is the projection of the top of the transverse rib, and the boundary of the lower half part is the projection of the base circle part;
and (4.2) acquiring coordinates of each point on the lower half part boundary of the projection drawing on the projection drawing, then performing circle fitting, and taking the obtained fitted circle as a reference circle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116228697A (en) * | 2023-02-14 | 2023-06-06 | 中交第二航务工程局有限公司 | Steel bar part quality detection method based on unmanned aerial vehicle image point cloud data |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4025851B1 (en) * | 2007-04-17 | 2007-12-26 | 株式会社アルケミー | Thread section deformed steel bar |
| CN103900528A (en) * | 2012-12-28 | 2014-07-02 | 朱志洁 | Detection method for three-dimensional space section roundness of large component |
| CN106289145A (en) * | 2016-10-27 | 2017-01-04 | 北京理工大学 | A kind of cylindricity On-machine Test method |
| CN112207129A (en) * | 2020-09-30 | 2021-01-12 | 盐城市联鑫钢铁有限公司 | Detection control method for out-of-roundness of base circle of hot-rolled ribbed steel bar |
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- 2022-02-24 CN CN202210172606.8A patent/CN114646274B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4025851B1 (en) * | 2007-04-17 | 2007-12-26 | 株式会社アルケミー | Thread section deformed steel bar |
| CN103900528A (en) * | 2012-12-28 | 2014-07-02 | 朱志洁 | Detection method for three-dimensional space section roundness of large component |
| CN106289145A (en) * | 2016-10-27 | 2017-01-04 | 北京理工大学 | A kind of cylindricity On-machine Test method |
| CN112207129A (en) * | 2020-09-30 | 2021-01-12 | 盐城市联鑫钢铁有限公司 | Detection control method for out-of-roundness of base circle of hot-rolled ribbed steel bar |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116228697A (en) * | 2023-02-14 | 2023-06-06 | 中交第二航务工程局有限公司 | Steel bar part quality detection method based on unmanned aerial vehicle image point cloud data |
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