CN115852762A - Grinding stone angle power conversion steel rail profile grinding optimization method - Google Patents
Grinding stone angle power conversion steel rail profile grinding optimization method Download PDFInfo
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Abstract
The invention discloses a grinding grindstone angle power conversion steel rail profile grinding optimization method, which comprises the steps of firstly, carrying out profile measurement on the whole line, and classifying the obtained actual measurement profile according to a daily grinding plan; design the representative profile that interval profile of polishing corresponds afterwards, compare representative profile and the profile of polishing, design representative profile and polish to the fixed angle of polishing and the fixed power mode of polishing that the profile of polishing corresponds, compare whole interval profile with the profile of polishing in proper order afterwards, according to interval actual measurement profile and the profile of polishing deviation, adjust the positive and negative angle power of polishing of mode, realize that whole interval is polished by a fixed angle mode of polishing, can reach the different mesh of different position department rail grinding volume again. And after polishing, measuring every 500m interval between the line areas, if the line areas are not qualified, re-designing the representative profile and the variable power polishing scheme according to the flow, and if the line areas are qualified, finishing polishing.
Description
Technical Field
The invention relates to the field of rail grinding, in particular to a grinding optimization method for steel rail profile grinding by angle and power conversion of a grinding stone.
Background
The rail grinding has great significance for prolonging the service life of the rail and improving the running quality of the train, but the difference of the rail profile of different sections with different mileage is large due to the wheel-rail relationship effect because the wheel tread difference of different trains is large. Rail sanding vehicle adjustment grindstone angle different positions in rail profile shape surface of polishing, when using the sanding vehicle to polish the rail, because different mileage rail profile differences are obvious, lead to the sanding vehicle to polish in-process grindstone angle and need frequently switch. The frequent switching mode of the angle of the grinding stone of the grinding vehicle brings two main defects:
(1) The track surface irregularity and the track surface corrugation are easy to occur due to frequent angle switching of the grinding grindstone;
(2) When the angle of the grinding stone is switched, the grinding vehicle needs to stop working, and the grinding efficiency is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a rail profile grinding optimization method for angle power conversion of a grinding stone, which comprises the following specific steps:
step 1: and collecting profile data of the whole track steel rail.
Step 2: and (5) making a daily polishing interval plan.
And step 3: the average representative profile design of the construction interval every day comprises the following specific steps:
A. the actual measurement profile of the polishing interval every day is discretized along the transverse direction of the steel rail at equal intervals, and the actual measurement profile is changed into a large number of discrete points. And then determining the point with the maximum y-axis of each measured profile, defining the point A1, and aligning the points A1 of the measured profiles. Then a line L1 parallel to the X axis is made through the point A1, a line L2 parallel to the line L1 is made further downwards by 16mm, and the line L2 intersects with each measured profile at two points A2 and A3. And finally, aligning A1 and A2 on each measured profile, wherein the alignment principle is that the distance between the points A1 on 2 profiles plus the distance between the points A2 on 2 profiles is the shortest.
B. And averagely dividing the aligned measured profile into 10 regions along the transverse direction of the steel rail, wherein each region consists of n measured profiles and has k discrete points.
C. The average representative profile of the design interval has the same design method, which specifically comprises the following steps:
the calculation formula of the horizontal and vertical coordinates (xi, yi) of the representative profile point of the ith discrete point of the n measured profiles in each interval is as follows:
in the formula, x ni ，y ni Respectively is the horizontal and vertical coordinate of the ith discrete point of the nth measured profile.
Therefore, the representative profile point coordinates of each discrete point of each measured profile in all the intervals are obtained, and the total number is 10 times k.
D. And fitting the 10 times k representative profile points to obtain the designed average representative profile.
And 4, step 4: and aligning the average representative profile with the standard profile, and defining the normal interval between each angle point on the standard profile rail head and the average representative profile as the required grinding amount according to the angle distribution of the grinding profile rail head so as to obtain a grinding mode, wherein the grinding mode comprises the angle to be ground and the power to be ground for each angle.
Further, aligning all the actual measurement profiles of the interval with the standard profile, sequentially calculating the polishing amount of the standard profile and each rail head angle of each actual measurement profile, and changing the angle power of the polishing mode under the condition of not changing the angle deflection of the grinding stone according to the polishing angle obtained by calculating the average representative profile so as to obtain the polishing mode and the polishing scheme of the whole interval.
After polishing, every 500m interval between line areas is measured, if the inspection acceptance is unqualified, the representative profile design and the variable power polishing scheme design are carried out again according to the flow, if the inspection acceptance is qualified, polishing is finished, and finally, the joint between two adjacent polishing areas is polished, so that the grinding and the pit are avoided from occurring at the polishing joint.
The invention has the advantages that: can be so that the grindstone angle of polishing not switch under the condition, polish to whole interval circuit to make whole interval profile polish to examining and accepting the standard, simultaneously, the problem that the car need stop work when avoiding the grindstone angle of polishing to switch has improved the efficiency of polishing.
Drawings
FIG. 1 is an overall flow chart of the method of the present invention;
FIG. 2 is a data arrangement mode of a Beijing gang high-speed rail profile;
FIG. 3 is a schematic diagram of the alignment of the actual measurement profile of the polishing interval per day in the method of the present invention;
FIG. 4 is a schematic diagram illustrating a dividing manner of an actually measured profile region after alignment in the method of the present invention;
FIG. 5 is a schematic representation of the interval average profile obtained in the process of the present invention;
FIG. 6 is a diagram of a new 60N profile railhead angle profile;
FIG. 7 is a normal phase spacing curve diagram between each angle point and the average representative profile on the rail head of a brand-new 60N profile;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a rail profile grinding optimization method for angle power conversion of a grinding stone, which comprises the following specific steps as shown in figure 1:
step 1: and surveying and collecting profile data of the whole line steel rail at intervals of 500 m.
Step 2: and classifying the profiles of the polishing intervals every day.
The method comprises the steps of making a construction interval plan every day according to railway work, arranging the profile of the whole line steel rail, putting the interval profile needing to be polished into a folder every day, and facilitating the design of average representative profile of the interval profile in the future. Taking a high-speed rail in Kyoto as an example, the upper run was polished for 670km-716km, approximately 10km per day according to the daily polishing construction plan shown in Table 1, and the daily polishing profile was placed in a separate folder as shown in FIG. 2.
Table 1 daily polishing construction schedule for high-speed rail in kyotong
And step 3: the daily sanding interval represents the profile design on average.
The profile in each grinding interval is many, and different profiles are different, so that different profiles need to be unified into one profile, which is called as an average representative profile, and an initial grinding mode design is carried out according to the average representative profile, so that the grinding of the rail profile in the grinding interval can be carried out by adopting a grinding mode with a fixed grinding angle, and the specific design method comprises the following steps:
A. daily polishing interval actual measurement profile alignment
As shown in fig. 3, discretizing the actual measurement profile collected in the daily grinding interval in the step 1 at intervals of 0.5mm according to an x-axis (transverse direction of the steel rail), and changing the actual measurement profile into a large number of discrete points; then finding the point with the maximum y axis of each measured profile in the interval, defining the point as A1, aligning the points A1 of each measured profile, then making a line L1 parallel to the X axis through the point A1, further making a line L2 parallel to the L1 downwards by 16mm, intersecting the L2 with each measured profile at the left and right points A2 and A3, and finally aligning the points A1 and A2 on each measured profile, wherein the alignment principle is that the distance between the points A1 on the 2 profiles plus the distance between the points A2 of the 2 profiles is the shortest, namely the points A1 and A2 on the two measured profiles are considered to be aligned.
B. Average representative profile design
As shown in fig. 4, after the actual measurement profiles are aligned, the aligned actual measurement profiles are averagely divided into 10 regions along the x-axis, as shown in fig. 4, if the width of the rail head is 75mm, the actual measurement rail profiles are dispersed at intervals of 0.5mm according to the x-axis coordinate, 150 discrete points are accumulated, the discrete points are defined as 1,2,3 \823030, 150 points, because the actual measurement rail head is averagely divided into 10 regions, each profile of each region has 15 discrete points, the discrete points of each region are individually designed, each region is composed of n actual measurement profiles, and the n actual measurement profiles accumulate 15 × n discrete points.
Subsequently, the average representative profile of each region is designed, the design method is the same, and the following description will be given by taking region 1 as an example, and the method is as follows:
respectively defining n measured profiles in the region 1 as B 1 、B 2 …B n Actually measured profile B 1 The discrete point is defined as B from small to large according to the x-axis coordinate 11 (x 11 、y 11 )、B 12 (x 12 、y 12 )、B 13 (x 13 、y 13 )…B 115 (x 115 、y 115 )，B 2 The discrete points of the profile are defined as B from small to large according to the x axis 21 (x 21 、y 21 )、B 22 (x 22 、y 22 )、B 23 (x 23 、y 23 )…B 215 (x 215 、y 215 ) By analogy, B n The discrete points of the profile are defined as B from small to large according to the x axis n1 (x n1 、y n1 )、B n2 (x n2 、y n2 )、B n3 (x n3 、y n3 )…B n15 (x n115 、y n115 )。
Let discrete points of x-axis coordinate from small to large in n actual measurement profiles in region 1 be number 1-15 discrete points respectively, and carry out representative profile point design on each discrete point respectively, specifically as follows:
the calculation formula of the horizontal and vertical coordinates (x 1, y 1) of the discrete point No. 1 of the n actually measured profiles in the area 1 is as follows:
the calculation formula of the horizontal and vertical coordinates (x 2, y 2) of the representative profile point of the number 2 discrete points of the n actually measured profiles in the region 1 is as follows:
……
by analogy, the calculation formula of the number 15 discrete points of the n actually measured profiles in the region 1 for representing the horizontal and vertical coordinates (x 15, y 15) of the profile points is as follows:
and then, designing other 9 interval representative profile points according to the method, and cumulatively designing to obtain 150 representative profile points.
Finally, fitting 150 representative profile points by using a least square method to obtain a designed average representative profile, as shown in fig. 5.
And 4, step 4: grinding scheme design for grinding angle power change of grinding stone
By aligning the average representative profile obtained by the design with a standard profile (typically a completely new 60N profile, selected specifically according to the wiring situation), the alignment is the same as the alignment of the profile actually measured in step a. According to the brand new 60N profile railhead angle distribution specified in the high-speed railway rail grinding management method, as shown in figure 6. The normal spacing between each angle point on the rail head of the new 60N profile and the average representative profile is defined as the required sanding amount, as shown in fig. 7. And designing a grinding mode according to the grinding amount between each angle and the average representative profile on the rail head of the brand-new 60N profile, wherein the grinding mode comprises the angle to be ground and the power to be ground for each angle, the grinding amount for each angle is controlled according to the grinding power, and the grinding amount is increased when the power is increased, as shown in table 2.
Table 2 average representative profile grinding angles and corresponding grinding powers
| Representative profile grinding angle | Polishing angle corresponding power |
| -8.0 | The power is 60% |
| -7.0 | The power is 60% |
| -5.0 | The power is 60% |
| -3.0 | The power is 60% |
| -10 | The power is 60% |
| -6.0 | The power is 60% |
| -5.0 | The power is 60% |
| -4.0 | The power is 60% |
| -30 | The power is 60% |
| -10 | The power is 60% |
| 45.0 | The power is 70% |
| 40.0 | The power is 70% |
| 36.0 | The power is 70% |
| 32.0 | The power is 70% |
| 30.0 | The power is 70% |
| 28.0 | The power is 70% |
| 25.0 | The power is 70% |
| 23.0 | The power is 70% |
| 20.0 | The power is 70% |
| 17.0 | The power is 70% |
| 14.0 | The power is 70% |
| 10.0 | The power is 70% |
| 5.0 | The power is 70% |
| 2.0 | The power is 70% |
Because each measured profile is different from the average representative profile, all the measured profiles in the interval are aligned with the brand-new 60N profile, the alignment mode is the same as the measured profile alignment mode in the step A, the grinding amount of each rail head angle position of the brand-new 60N profile and each measured profile is sequentially calculated, the grinding power of the positive angle and the negative angle of the grinding mode is adjusted under the condition that the angle deflection of the grinding stone is not changed according to the grinding angle calculated by the average representative profile, the grinding of the steel rail in the whole interval by the fixed angle grinding mode is realized, and the aim of different grinding amounts of the steel rail at different positions can be fulfilled. As shown in tables 3 and 4, all the measured profiles can be polished to the same profile by adjusting the angle power of the polishing mode, so that there is no difference in the profile of the whole region after polishing.
TABLE 3 Interval sanding mode
Table 4 interval polishing scheme
| Serial number | Row pin | Starting point | Terminal account | Length of | Left thigh | Right thigh | Number of |
| 1 | On the upper part | 299 | 300.5 | 1.50 | 1 | 2 | 1 |
| 2 | On the upper part | 300.5 | 301.5 | 1.00 | 3 | 2 | 1 |
| 3 | On the upper part | 301.5 | 302.5 | 1.00 | 2 | 5 | 1 |
| 4 | Upper part of | 302.5 | 303.5 | 1.00 | 4 | 5 | 1 |
| 5 | Upper part of | 303.5 | 304.5 | 1.00 | 1 | 2 | 1 |
| 6 | On the upper part | 304.5 | 305.5 | 1.00 | 1 | 4 | 1 |
| 7 | Upper part of | 305.5 | 306.5 | 1.00 | 2 | 1 | 1 |
| 8 | Upper part of | 306.5 | 307.5 | 1.00 | 3 | 2 | 1 |
| 9 | On the upper part | 307.5 | 308.5 | 1.00 | 2 | 1 | 1 |
| 10 | On the upper part | 308.5 | 309.5 | 1.00 | 2 | 3 | 1 |
| 11 | On the upper part | 309.5 | 310.5 | 1.00 | 1 | 5 | 1 |
| 12 | On the upper part | 310.5 | 311.5 | 1.00 | 1 | 3 | 1 |
| 13 | On the upper part | 311.5 | 312.5 | 1.00 | 3 | 2 | 1 |
| 14 | Upper part of | 312.5 | 313.5 | 1.00 | 1 | 5 | 1 |
And 5: on-line real-time acceptance check of polishing profile
After polishing, measuring the whole section according to the rail profile every 0.5km at once, aligning the inspected and measured profile with the brand-new 60N profile according to the method, wherein each profile is qualified by requiring that the deviation value mean value of each angle of the rail profile and the polished profile is less than 0.2mm, if the accumulated 80% of the profile of the section line is qualified by inspection, polishing the whole section is qualified, and if the accumulated less than 80% of the profile of the section line is qualified by inspection, further polishing the rail according to the flow.
And 6: adjacent section polishing and connecting
After the current interval is polished to be qualified, because the rail grinding wagon appears very obviously polishing vestige and cross the phenomenon of polishing under the interval initial position department of polishing easily, the crossing position department profile difference of two adjacent intervals can be comparatively obvious this moment, in order to avoid this kind of problem to produce, need use small-size artifical polisher to polish to the crossing place in interval after the interval is polished and connect with the same direction, guarantee that the crossing position rail profile in interval is unanimous.
Claims (6)
1. A grinding stone angle power conversion steel rail profile grinding optimization method is characterized by comprising the following steps: the method comprises the following specific steps:
step 1: collecting profile data of the whole line steel rail;
step 2: making a daily polishing interval plan;
and step 3: the average representative profile design of the construction interval every day comprises the following specific steps:
A. discretizing the actual measurement profile of the polishing interval every day at equal intervals along the transverse direction of the steel rail, and changing the actual measurement profile into a large number of discrete points; then determining the point with the maximum y axis of each measured profile, defining the point as A1, aligning the points A1 of each measured profile, then making a line L1 parallel to the X axis through the point A1, further making a line L2 parallel to the L1 downwards by 16mm, intersecting the L2 and each measured profile at a left point, a right point, A2 and A3, and finally aligning the points A1 and A2 on each measured profile, wherein the alignment principle is that the distance between the points A1 on the 2 profiles plus the distance between the points A2 of the 2 profiles is the shortest;
B. averagely dividing the aligned actual measurement profile into 10 regions along the transverse direction of the steel rail, wherein each region consists of n actual measurement profiles and is provided with k discrete points;
C. the average representative profile of the design interval has the same design method, and specifically comprises the following steps:
the calculation formula of the horizontal and vertical coordinates (xi, yi) of the ith discrete point of the n measured profiles in each interval is as follows:
in the formula, x ni ，y ni Respectively is the horizontal and vertical coordinates of the ith discrete point of the nth measured profile;
obtaining representative profile point coordinates of discrete points of each actually measured profile in all intervals, wherein the number of the representative profile point coordinates is 10 times k;
D. fitting the 10 times k representative profile points to obtain a designed average representative profile;
and 4, step 4: aligning the average representative profile with the standard profile, defining the normal interval between each angle point on the standard profile rail head and the average representative profile as the required grinding amount according to the angle distribution of the grinding profile rail head, and further obtaining a grinding mode, wherein the grinding mode comprises the angle to be ground and the power to be ground for each angle;
further, aligning all the actual measurement profiles of the interval with the standard profile, sequentially calculating the polishing amount of the standard profile and each rail head angle of each actual measurement profile, and changing the angle power of the polishing mode under the condition of not changing the angle deflection of the grinding stone according to the polishing angle obtained by calculating the average representative profile so as to obtain the polishing mode and the polishing scheme of the whole interval.
2. A method of optimizing the angle power conversion rail profile grinding of a grinding stone as set forth in claim 1, wherein: and 2, storing the daily polishing interval profile in the same folder.
3. A method of optimizing the angle power conversion rail profile grinding of a grinding stone as set forth in claim 1, wherein: in the step 4, the alignment mode of the average representative profile and the standard profile and the alignment mode of the actual measurement profile and the standard profile adopt the mode of the step A.
4. A method of optimizing the angle power conversion rail profile grinding of a grinding stone as set forth in claim 1, wherein: after polishing, measuring the section according to the rail profile of every 0.5km, measuring the polished profile, aligning the measured profile with the standard, wherein each profile is qualified by requiring that the deviation value mean value of each angle of the rail profile and the polished profile is less than 0.2mm, if 80% of accumulated profile lines of the section are qualified by inspection, polishing the whole section is qualified, and if the accumulated profile lines of the section are less than 80% of the profile inspection qualified by inspection, performing step 3 and step 4 again, and further polishing the rail.
5. The angle-power conversion rail profile grinding optimization method for grinding a grindstone according to claim 4, characterized in that: and (4) after polishing, aligning the measuring profile with the standard profile by adopting a step A mode.
6. A method of optimizing the angle power conversion rail profile grinding of a grinding stone as set forth in claim 1, wherein: and after interval grinding, grinding the intersected positions of the intervals by using an artificial grinding machine.
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