CN114054703A - Steel rail flaw detection and flaw reporting position positioning method - Google Patents
Steel rail flaw detection and flaw reporting position positioning method Download PDFInfo
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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Abstract
The invention relates to a method for positioning flaw detection and reporting positions of steel rails, and belongs to the technical field of steel rail flaw detection methods. The technical scheme of the invention is as follows: firstly, calculating the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the first casting blank relative to the casting blank, and then calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the first casting blank actually cut by the furnace number of the corresponding casting blankCutting machineThen calculating the flaw detection reporting position of the steel rail and the actual casting position of the furnace where the corresponding casting blank is positioned to cut the end part length L of the casting blankFruit of Chinese wolfberry. The invention has the beneficial effects that: according to the position of the flaw detection defect on the steel rail, the accurate length of the distance between the position of the corresponding casting blank and the molten steel pouring of the furnace is calculated, the influence rule of the steel rail pouring condition on the steel rail flaw detection can be accurately reflected, data reference is provided for optimizing a steel rail smelting process, and therefore the flaw detection qualification rate is improved.
Description
Technical Field
The invention relates to a method for positioning flaw detection and reporting positions of steel rails, and belongs to the technical field of steel rail flaw detection methods.
Background
The quality of the steel rail is directly related to the safe operation of the railway, so that the quality of each steel rail in the upper track operation meets the relevant standard requirements. In order to ensure that the quality of each steel rail is qualified, the steel rail needs to be subjected to internal quality inspection and external quality inspection when leaving a factory, wherein the internal quality of the steel rail is mainly inspected through ultrasonic flaw detection, and the position of a defect existing in the steel rail can be accurately reflected through the ultrasonic flaw detection of the steel rail.
The defect of poor rail detection mainly refers to the fact that a casting blank for rolling a steel rail has quality defects, the quality defects of the casting blank for rolling the steel rail are mainly related to process fluctuation in the process of steel rail smelting and casting, wherein the molten steel pouring condition of each furnace of the steel rail has important influence on the quality of the casting blank, in order to research the corresponding relation between the position of the defect of the rail detection and the molten steel pouring condition, the position of the defect of the rail detection corresponding to the position of the casting blank needs to be determined, the pouring distance between the position of the corresponding casting blank and the molten steel in the furnace is calculated, and the length of the cast blank is cast when the molten steel in the furnace starts to be poured to the position of the casting blank corresponding to the defect of the rail detection.
The head of the first casting blank cast by molten steel in each furnace is taken as the starting point of the casting blank, and the position of the flaw detection defect of the steel rail and the casting blank casting distance are calculated. During smelting, the molten steel in each furnace is surplus in the middle ladle, the first cast blank cast in each furnace of the steel rail is not completely cast by the molten steel in the furnace, and part of the molten steel can come from the previous furnace, so that the molten steel cast in the furnace is positioned in the middle of the first cast blank; the molten steel cast in the last casting blank of the casting furnace is not all the molten steel in the furnace, and part of the molten steel can come from the next molten steel, so that the position for starting the next molten steel is positioned before the first casting blank of the furnace. Therefore, the distance between the flaw detection position of the steel rail and the cast blank is calculated by taking the first casting blank in the furnace as the starting point of the furnace casting, and the distance is inaccurate.
Disclosure of Invention
The invention aims to provide a method for positioning flaw detection and flaw reporting positions of steel rails, which is characterized in that according to the positions of flaw detection defects on the steel rails, the accurate length of the position of a corresponding casting blank from molten steel casting of a furnace is calculated, the influence rule of the steel rail casting condition on the steel rail flaw detection can be accurately reflected, data reference is provided for optimizing a steel rail smelting process, the flaw detection qualification rate is improved, and the problems in the background art are effectively solved.
The technical scheme of the invention is as follows: a method for positioning a flaw detection and reporting position of a steel rail comprises the following steps:
(1) firstly, calculating the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the branch casting blank, wherein the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the branch casting blank is represented by P, P = (C + E)/delta, wherein C represents the length of a crop end in the rolling process of the steel rail, E represents the distance length between the flaw detection and damage reporting position of the steel rail and the end part of the steel rail, and delta represents the compression ratio of the steel rail;
(2) then calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the first casting blank actually cut by the furnace number of the corresponding casting blankCutting machineIf the flaw detection reports that the steel rail casting blank is the nth steel rail cut in the furnace, LCutting machineThe length of the steel rail from the 1 st rail to the n-1 st rail is equal to the sum of the lengths of the steel rails cut in the heat, and P is added;
(3) finally, calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the cut casting blank corresponding to the actual casting starting position of the heat of the casting blankFruit of Chinese wolfberry，LFruit of Chinese wolfberry= LCutting machine- Δ L, wherein Δ L represents the length of the remainder per cast strand per furnace of molten steel.
In the step (1), the rail compression ratio δ = a/B, where a represents a casting slab cross-sectional area and B represents a rail cross-sectional area.
In the step (3), the method for calculating the surplus length delta L of each molten steel in each furnace per casting blank is as follows:
taking a casting time for rail smelting as a research object, wherein the casting time is used for smelting N furnaces together, and the furnace number of each furnace is marked1, 2, 3, … … N; the mark corresponding to the weight of molten steel in each furnace is G1、G2、G3、…… GNThe casting time is divided into X-flow casting, and the length of the casting time drainage blank is D1The length of the secondary casting tail billet is D2The residual molten steel in the tundish is D3，
Total weight of all molten steel G in the castingGeneral assembly，GGeneral assembly=G1+G2+G3+……GN
The weight of the actual casting molten steel of the casting time is GGeneral 1，GGeneral 1=GGeneral assembly-D3
The length of each cut casting blank in each furnace is recorded as L, and the length of each cast blank in each flow in the No. 1 furnace is recorded as L1And the length of each casting blank of the Nth furnace is recorded as LN；
The length of each casting blank in each furnace is recorded as LNnThe length of the 1 st casting blank of the 1 st furnace is L11And the length of the No. 2 casting blank of the No. 1 furnace is recorded as L12The length of the nth casting blank in the 1 st furnace is recorded as L1n(ii) a The length of the 1 st casting blank of the Nth furnace is recorded as LN1And the length of the No. 2 casting blank of the Nth furnace is recorded as LN2And the length of the nth casting blank of the Nth furnace is recorded as LNn；
Thus: l is1 =L11+L12+……L1n
LN =LN1 + LN2 + …… LNn
The actual casting blank length of the casting time is as follows:
Lgeneral assembly = （L1+L2+L3+……+LN+D1+D2）*X
The average meter weight of the casting blank cast by the molten steel of the casting time is gm，gm=GGeneral 1/LGeneral assembly
The length of each furnace per flow of actual casting blank is L0 = G/（gm *X）
The length of each flow of actual casting blank of the furnace 1 is L01 = G1/（gm *X）
The length of each flow of actual casting blank of the Nth furnace is L0N = GN/（gm *X）
The length of the surplus of each flow casting blank of molten steel in each furnace is as follows: Δ L = L0 - L。
When the delta L is more than 0, the surplus of the molten steel in the furnace is shown, part of the molten steel participates in the casting of the first casting blank of the next furnace, and the molten steel casting position of the next furnace is positioned behind the head of the first casting blank of the next furnace;
when the delta L is less than 0, the furnace molten steel is not enough to cut all casting blanks, the next furnace molten steel participates in the casting of the last casting blank of the furnace, and the next furnace molten steel casting starting position is positioned in front of the head of the first casting blank of the next furnace;
and delta L is equal to 0, which indicates that the molten steel in the furnace is just cast to cut the last casting blank in the furnace, no molten steel participates in casting of the casting blank in the next furnace, the molten steel in the next furnace also does not participate in casting of the last casting blank in the furnace, and the molten steel in the next furnace is poured at the head of the first casting blank in the next furnace.
The invention has the beneficial effects that: according to the position of the flaw detection defect on the steel rail, the accurate length of the distance between the position of the corresponding casting blank and the molten steel pouring of the furnace is calculated, the influence rule of the steel rail pouring condition on the steel rail flaw detection can be accurately reflected, data reference is provided for optimizing a steel rail smelting process, and therefore the flaw detection qualification rate is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the following describes technical solutions of the embodiments of the present invention clearly, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for positioning a flaw detection and reporting position of a steel rail comprises the following steps:
(1) firstly, calculating the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the branch casting blank, wherein the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the branch casting blank is represented by P, P = (C + E)/delta, wherein C represents the length of a crop end in the rolling process of the steel rail, E represents the distance length between the flaw detection and damage reporting position of the steel rail and the end part of the steel rail, and delta represents the compression ratio of the steel rail;
(2) then calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the first casting blank actually cut by the furnace number of the corresponding casting blankCutting machineIf the flaw detection reports that the steel rail casting blank is the nth steel rail cut in the furnace, LCutting machineThe length of the steel rail from the 1 st rail to the n-1 st rail is equal to the sum of the lengths of the steel rails cut in the heat, and P is added;
(3) finally, calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the cut casting blank corresponding to the actual casting starting position of the heat of the casting blankFruit of Chinese wolfberry，LFruit of Chinese wolfberry= LCutting machine- Δ L, wherein Δ L represents the length of the remainder per cast strand per furnace of molten steel.
In the step (1), the rail compression ratio δ = a/B, where a represents a casting slab cross-sectional area and B represents a rail cross-sectional area.
In the step (3), the method for calculating the surplus length delta L of each molten steel in each furnace per casting blank is as follows:
taking a casting time for steel rail smelting as a research object, wherein the casting time is a total smelting N furnace, and the furnace numbers of each furnace are marked as 1, 2, 3 and … … N; the mark corresponding to the weight of molten steel in each furnace is G1、G2、G3、…… GNThe casting time is divided into X-flow casting, and the length of the casting time drainage blank is D1The length of the secondary casting tail billet is D2The residual molten steel in the tundish is D3，
Total weight of all molten steel G in the castingGeneral assembly，GGeneral assembly=G1+G2+G3+……GN
The weight of the actual casting molten steel of the casting time is GGeneral 1，GGeneral 1=GGeneral assembly-D3
The length of each cut casting blank in each furnace is recorded as L, and the length of each cast blank in each flow in the No. 1 furnace is recorded as L1And the length of each casting blank of the Nth furnace is recorded as LN；
The length of each casting blank in each furnace is recorded as LNnThe length of the 1 st casting blank of the 1 st furnace is L11And the length of the No. 2 casting blank of the No. 1 furnace is recorded as L12The length of the nth casting blank in the 1 st furnace is recorded as L1n(ii) a The length of the 1 st casting blank of the Nth furnace is recorded as LN1And the length of the No. 2 casting blank of the Nth furnace is recorded as LN2The length of the nth casting blank in the Nth furnace is recorded asLNn；
Thus: l is1 = L11+L12+……L1n
LN =LN1 + LN2 + …… LNn
The actual casting blank length of the casting time is as follows:
Lgeneral assembly=（L1+L2+L3+……+LN+D1+D2）*X
The average meter weight of the casting blank cast by the molten steel of the casting time is gm，gm=GGeneral 1/LGeneral assembly
The length of each furnace per flow of actual casting blank is L0 = G/（gm *X）
The length of each flow of actual casting blank of the furnace 1 is L01 = G1/（gm *X）
The length of each flow of actual casting blank of the Nth furnace is L0N = GN/（gm *X）
The length of the surplus of each flow casting blank of molten steel in each furnace is as follows: Δ L = L0 - L。
When the delta L is more than 0, the surplus of the molten steel in the furnace is shown, part of the molten steel participates in the casting of the first casting blank of the next furnace, and the molten steel casting position of the next furnace is positioned behind the head of the first casting blank of the next furnace;
when the delta L is less than 0, the furnace molten steel is not enough to cut all casting blanks, the next furnace molten steel participates in the casting of the last casting blank of the furnace, and the next furnace molten steel casting starting position is positioned in front of the head of the first casting blank of the next furnace;
and delta L is equal to 0, which indicates that the molten steel in the furnace is just cast to cut the last casting blank in the furnace, no molten steel participates in casting of the casting blank in the next furnace, the molten steel in the next furnace also does not participate in casting of the last casting blank in the furnace, and the molten steel in the next furnace is poured at the head of the first casting blank in the next furnace.
Example (b):
smelting a casting time U75V steel rail, wherein the casting time is 24 furnaces in total, the section of a casting blank is 280mm x 380mm, and the section area A = 1064cm2Length D of casting blank to be drained1=6.5m, length of tail billet cast strand D2=5m, the tundish is finally leftMolten steel D3And the weight of molten steel in each furnace is shown in table 1, and the actual cutting length of each cast billet in each furnace is shown in table 2.
The casting blank is completely rolled into a 60N steel rail, and the section area B of the steel rail is = 77.01cm2The length of the cut end of the steel rail is C = 1.5m, and the compression ratio of the steel rail is delta = A/B = 13.8.
TABLE 1 weight of molten steel per furnace G
TABLE 2 cutting Length per furnace per flow of cast stock
From Table 1, the total weight G of the poured molten steelGeneral assembly，GGeneral assembly=G1+G2+G3+……G24=3387.223 ton.
The weight of the actual casting molten steel of the casting time is GGeneral 1，GGeneral 1= GGeneral assembly-D3=3387.223 ton-15 ton =3372.223 ton.
From table 2, the cutting length L of each cast strand of each furnace is calculated, and the cutting length of each cast strand of each furnace is shown in table 3.
TABLE 3 cutting Length per flow of cast billet for each furnace
Total length L of casting blankGeneral assembly= （L1+L2+L3+……+LN+D1+D2）*X ，
LGeneral assembly= （26.44+39.7+31.76+……+22.49+6.5+5）*5= 4073.65 m
The average rice weight of the casting blank of the casting time is as follows: gm，gm=GGeneral 1/L Total=3372.223 ton/4073.65 m = 0.8278 ton/m.
Each furnace is wateredActual cast billet length L0 = G/（gmX), the length of the remainder of each cast strand of molten steel in each furnace: Δ L = L0-L, actual strand length L of each furnace strand0And the heat molten steel residue condition delta L, as shown in Table 4.
TABLE 4 casting length, cutting length and residual length of molten steel in each furnace
(1) Calculation example 1
Rolling a hectometer steel rail by a No. 1 casting blank of a No. 3 flow of a No. 2 furnace, and finding 56m parts of the steel rail to report damage during flaw detection, wherein the distance from the position to a casting position is calculated as follows:
the relative distance between the reported flaw and the casting blank P = (C + E)/delta = (56 + 1.5)/13.8 = 4.17m
The casting blank is the 1 st casting blank cut by the furnace, and the cutting distance of the damaged casting blank is LCutting machine =4.17m
The Δ L =2.08m of the molten steel in the previous furnace (furnace 1), and the distance of the reported flaw relative to the cast-on position is as follows:
Lfruit of Chinese wolfberry = LCutting machine-ΔL =4.17-2.08=2.09m
The distance between the flaw reporting position of the branch steel rail and the casting blank casting starting position of the furnace is 2.09 m.
(2) Calculation example 2
Rolling a hectometer steel rail by a 4 th flow 3 rd casting blank of a 4 th furnace, and finding a position 27.5m away from a casting position to report a flaw during flaw detection, wherein the calculation result of the position away from the casting position is as follows:
the damage reporting position is relatively far from the casting blank by P, P = (C + E)/delta = (27.5 + 1.5)/13.8 = 4.17m
The third casting blank is the 3 rd casting blank cut by the furnace, and the cutting distance of the damaged casting blank is LCutting machine=1 st strand cut length + 2 nd strand cut length +4.17m = 7.94+7.94+4.17 = 17.87 m
The delta L of the molten steel in the last furnace (the 3 rd furnace) is = -0.90m, and the distance of the reported damage relative to the cast-on position is as follows:
Lfruit of Chinese wolfberry = LCutting machine- ΔL =17.87 -（-0.90）= 18.77m
The distance between the flaw reporting position of the branch steel rail and the casting blank casting position of the furnace is 18.77 m.
(3) Calculation example 3
Rolling a hundred-meter steel rail by using the 2 nd casting blank of the 2 nd flow of the 10 th furnace, and finding a position 63m of the steel rail to report damage during flaw detection, wherein the distance from the position to the casting position is calculated as follows:
the reported flaw is relatively far from the casting blank by P, P = (C + E)/delta = (63 + 1.5)/13.8 = 4.67m
The casting blank is the 2 nd casting blank cut by the furnace, and the cutting distance of the damaged casting blank is LCutting machine=1 st strand cut length +4.67m = 7.94+ 4.67 = 12.61m
The molten steel in the previous furnace (ninth furnace) is Delta L = -0.68m, and the distance of the reported flaw relative to the cast-on position is as follows:
Lfruit of Chinese wolfberry = LCutting machine- ΔL =12.61 -（-0.68）= 13.29m
The distance between the flaw reporting position of the branch steel rail and the casting blank casting starting position of the furnace is 13.29 m.
(4) Calculation example 4
Rolling a hectometer steel rail by a No. 5 casting blank and a No. 4 casting blank of a No. 16 furnace, and finding 10 parts of the steel rail to report damage during flaw detection, wherein the distance from the position to the casting position is calculated as follows:
the damage reporting position is relatively far from the casting blank by P, P = (C + E)/delta = (10 + 1.5)/13.8 = 0.83m
The 4 th casting blank is cut by the furnace, and the cutting distance of the damaged casting blank is LCutting machine=1 st strand cut length + 2 nd strand cut length + 3 rd strand cut length +0.83m = 7.94+7.94+ 7.94+0.83 = 24.65m
The delta L of the molten steel in the previous furnace (the 15 th furnace) is = -2.24m, and the distance of the reported flaw relative to the cast-on position is as follows: l isFruit of Chinese wolfberry = LCutting machine- ΔL =24.65 -（-2.24）= 26.89m
The distance between the flaw reporting position of the branch steel rail and the casting blank casting starting position of the furnace is 26.89 m.
Claims (4)
1. A method for positioning flaw detection and flaw reporting positions of steel rails is characterized by comprising the following steps:
(1) firstly, calculating the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the branch casting blank, wherein the distance P between the flaw detection and damage reporting position of the steel rail and the end part of the branch casting blank is represented by P, P = (C + E)/delta, wherein C represents the length of a crop end in the rolling process of the steel rail, E represents the distance length between the flaw detection and damage reporting position of the steel rail and the end part of the steel rail, and delta represents the compression ratio of the steel rail;
(2) then calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the first casting blank actually cut by the furnace number of the corresponding casting blankCutting machineIf the flaw detection reports that the steel rail casting blank is the nth steel rail cut in the furnace, LCutting machineThe length of the steel rail from the 1 st rail to the n-1 st rail is equal to the sum of the lengths of the steel rails cut in the heat, and P is added;
(3) finally, calculating the flaw detection and damage reporting position of the steel rail and the length L of the end part of the cut casting blank corresponding to the actual casting starting position of the heat of the casting blankFruit of Chinese wolfberry，LFruit of Chinese wolfberry= LCutting machine- Δ L, wherein Δ L represents the length of the remainder per cast strand per furnace of molten steel.
2. The method for positioning the flaw detection and flaw reporting position of the steel rail according to claim 1, wherein: in the step (1), the rail compression ratio δ = a/B, where a represents a casting slab cross-sectional area and B represents a rail cross-sectional area.
3. The method for positioning the flaw detection and flaw reporting position of the steel rail according to claim 1, wherein: in the step (3), the method for calculating the surplus length delta L of each molten steel in each furnace per casting blank is as follows:
taking a casting time for steel rail smelting as a research object, wherein the casting time is a total smelting N furnace, and the furnace numbers of each furnace are marked as 1, 2, 3 and … … N; the mark corresponding to the weight of molten steel in each furnace is G1、G2、G3、…… GNThe casting time is divided into X-flow casting, and the length of the casting time drainage blank is D1The length of the secondary casting tail billet is D2The residual molten steel in the tundish is D3，
Total weight of all molten steel G in the castingGeneral assembly，GGeneral assembly=G1+G2+G3+……GN
The weight of the actual casting molten steel of the casting time is GGeneral 1，GGeneral 1=GGeneral assembly-D3
The length of each cut casting blank in each furnace is recorded as L, and the length of each cast blank in each flow in the No. 1 furnace is recorded as L1And the length of each casting blank of the Nth furnace is recorded as LN；
The length of each casting blank in each furnace is recorded as LNnThe length of the 1 st casting blank of the 1 st furnace is L11And the length of the No. 2 casting blank of the No. 1 furnace is recorded as L12The length of the nth casting blank in the 1 st furnace is recorded as L1n(ii) a The length of the 1 st casting blank of the Nth furnace is recorded as LN1And the length of the No. 2 casting blank of the Nth furnace is recorded as LN2And the length of the nth casting blank of the Nth furnace is recorded as LNn；
Thus: l is1= L11+L12+……L1n
LN= LN1 + LN2 + …… LNn
The actual casting blank length of the casting time is as follows:
Lgeneral assembly=（L1+L2+L3+……+LN+D1+D2）*X
The average meter weight of the casting blank cast by the molten steel of the casting time is gm，gm=GGeneral 1/LGeneral assembly
The length of each furnace per flow of actual casting blank is L0 = G/（gm *X）
The length of each flow of actual casting blank of the furnace 1 is L01 = G1/（gm *X）
The length of each flow of actual casting blank of the Nth furnace is L0N = GN/（gm *X）
The length of the surplus of each flow casting blank of molten steel in each furnace is as follows: Δ L = L0 - L。
4. The method for positioning the flaw detection and flaw reporting position of the steel rail according to claim 3, wherein the method comprises the following steps:
when the delta L is more than 0, the surplus of the molten steel in the furnace is shown, part of the molten steel participates in the casting of the first casting blank of the next furnace, and the molten steel casting position of the next furnace is positioned behind the head of the first casting blank of the next furnace;
when the delta L is less than 0, the furnace molten steel is not enough to cut all casting blanks, the next furnace molten steel participates in the casting of the last casting blank of the furnace, and the next furnace molten steel casting starting position is positioned in front of the head of the first casting blank of the next furnace;
and delta L is equal to 0, which indicates that the molten steel in the furnace is just cast to cut the last casting blank in the furnace, no molten steel participates in casting of the casting blank in the next furnace, the molten steel in the next furnace also does not participate in casting of the last casting blank in the furnace, and the molten steel in the next furnace is poured at the head of the first casting blank in the next furnace.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114054703B (en) | 2023-06-13 |
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