Adaptive fine grinding operation control method and system based on rail straightening curve

Abstract

The application provides a kind of self-adaptive fine grinding operation control method and system based on rail straightening curve, belongs to the field of track processing. The straightness curve of the rail welded joint is obtained by processing the straightening curve data measured in the rail straightening process. The fine grinding parameters are calculated according to the straightness curve. The fine grinding machine is automatically controlled to perform fine grinding operation by using the fine grinding parameters. The fine grinding parameters at least include the grinding times and the feed amount of the fine grinding machine. The application uses the straightening machine above the fine grinding process to calculate the parameters of the fine grinding process by using the straightness curve obtained in the straightening process. Compared with the manually set parameters, the obtained fine grinding parameters are more accurate. At the same time, the parameters are automatically transmitted to the fine grinding machine controller by using data communication technology, and the fine grinding machine automatically executes the operation parameters to perform the grinding operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a rail machining method, in particular, an adaptive fine grinding operation control method and system based on rail straightening curve. BACKGROUND

[0002] In the process of welded rail production in China, the steel rails are welded from 100-meter fixed size to 500-meter long rails. In the process of welded rail production, the overall purpose of the sequentially performed rough grinding (or rough milling), straightening, fine grinding and other operation procedures is to make the appearance size of the rail joint as consistent as possible with the base material to ensure the smoothness of the joint.

[0003] Among them, the purpose of the fine grinding operation of the steel rail is to finely grind the rail head tread and running working edge, and polish off the weld left high left by rough grinding (or rough milling), while smoothly processing the rail head misaligned teeth that do not exceed the standard. The fine grinding operation process is generally automatically performed according to the set fine grinding parameters, and the polishing process cannot be directly intervened by manual intervention, and the polishing quality depends on the preset parameters and the state before the joint polishing. The polishing process of the existing fine grinder and the setting of the key parameters therein are very important to the quality of the fine grinding operation of the steel rail.

[0004] Firstly, the fine grinding process is composed of multiple polishing, and after each polishing of the machine is completed, the next polishing is entered by adjusting the angle of the polishing head and the steel rail. Therefore, the key parameters of the existing fine grinding process are two parameters consisting of the number of polishing and the angle of each polishing, and the two parameters are currently set by manual setting. The fine grinding only polishes the surface of the steel rail head that may contact the wheel, and the other surfaces of the steel rail are not polished. The polishing number and angle are set according to the profile of the steel rail. When polishing the steel rails of the same profile, the settings of the two parameters can be unchanged.

[0005] Secondly, in each grinding stage of the fine grinding process, the grinding operation proceeds along the axial direction of the rail. The grinding mechanism moves rapidly back and forth on both sides of the weld, while simultaneously performing advance and retraction movements perpendicular to the grinding surface. This grinding process typically involves parameters such as the number of grinding passes and the grinding depth to control the grinding quality. The number of grinding passes refers to the number of axial reciprocating movements of the grinding mechanism. The grinding depth refers to the point at which the equipment considers the grinding quality to be satisfactory and ends the grinding process. Generally, the grinding operation has a certain number of redundant grinding passes, relying on the grinding depth to end a single grinding pass early. However, due to grinding efficiency limitations, if a large amount of material needs to be ground, the required number of grinding passes may be reached, but the actual grinding depth may not be achieved. In this case, the equipment will also stop grinding for that pass. This results in insufficient grinding and an excess of the required grinding height. In addition, excessive camber in the weld and rail head tread may cause the grinding head to come into too close contact with the rail during the grinding process, and the automatic retraction tool may not be able to handle it in time, resulting in the grinding head stopping.

[0006] Chinese patent CN102535279 discloses a "method for controlling the quality of CNC precision grinding of rail welded joints." This patent application addresses the technical problems that CNC precision grinding equipment for rails needs to solve. Because CNC precision grinding equipment is expensive and highly automated, it is mainly used for on-site precision grinding of rails, requiring the equipment to be moved to the site. Therefore, the technical problem this patent application aims to solve is the impact of on-site movement errors and temperature on grinding quality. However, the precision grinding control proposed in this invention refers to precision grinding on large-scale equipment used in rail welding plants, where the equipment operates in a fixed environment. The on-site temperature parameters and the error parameters of on-site equipment proposed in that patent are completely irrelevant in the context of this invention, which is based on large-scale equipment operation within a factory. Summary of the Invention

[0007] The purpose of this invention is to provide an adaptive fine grinding operation control method. By utilizing the straightening curve obtained during the straightening process from a straightening machine above the fine grinding mill, the parameters for the fine grinding operation are calculated. These parameters are then automatically transmitted to the fine grinding mill controller, which automatically executes the operation parameters and performs the grinding operation. This method effectively refines the grinding amount for each grinding operation, thereby improving the grinding efficiency of the equipment.

[0008] Another objective of this invention is to improve the grinding efficiency of the equipment by effectively subdividing the grinding amount for each grinding operation. At the same time, it also prevents machine stalling caused by excessive depth of cut in one pass and the inability to complete the operation in one pass due to excessive grinding amount.

[0009] Another objective of this invention is that, before the fine grinding mill operates, the operating parameters are adaptively adjusted based on the straightness curve of the rail, which can reduce the requirements for the accuracy of rough grinding and straightening operations, enable data exchange and use between equipment in the production line, and improve the overall operating efficiency of the production line.

[0010] The fourth objective of this invention is to provide a control system for an adaptive fine grinding operation control method. Based on existing rail welding base production equipment, and with minimal additional software and hardware costs, adaptive control of the fine grinding operation is achieved. This objective is achieved as follows:

[0011] To achieve the above objectives, this invention proposes an adaptive fine grinding operation control method based on the rail straightening curve. The method involves processing the straightening curve data measured during the rail straightening process to obtain the straightness curve of the rail welded joint; calculating fine grinding parameters based on the straightness curve; and using these fine grinding parameters to control the fine grinding machine to automatically perform the fine grinding operation. The fine grinding parameters include at least the number of grinding passes and the feed rate.

[0012] In the adaptive fine grinding operation control method described above, the straightening curve data measured during the rail straightening process consists of the last curve data measuring the straightening flatness.

[0013] In the adaptive fine grinding operation control method described above, the straightening curve data measured during the rail straightening process is composed of the rail joint straightness curve measured by the straightening machine measuring head.

[0014] In the adaptive fine grinding operation control method described above, the rail straightening process uses any conventional measuring device to measure the straightness curve of the rail joint.

[0015] The adaptive fine grinding operation control method described above, wherein the fine grinding parameters are calculated as follows: based on the flatness curve, the grinding height H1 of the weld grinding area and the grinding height H2 of the base material grinding area are calculated respectively; based on the grinding heights H1 and H2, the grinding times N1 of the weld grinding area and N2 of the base material grinding area are calculated respectively; based on the grinding times N1 and N2, the feed rate H of the weld grinding area and the base material grinding area are calculated respectively. N1 and H N2 These constitute the fine grinding parameters that control the fine grinding mill.

[0016] In the adaptive fine grinding operation control method described above, the grinding area of ​​the base material is set according to the rail model.

[0017] In the adaptive fine grinding operation control method described above, the weld grinding area is the width of the weld height after rough grinding; the weld height is a small step where the center of the straightness curve suddenly rises.

[0018] In the adaptive fine grinding operation control method described above, the grinding height H1 of the weld grinding area is obtained by subtracting the calculated height value of point e from the highest point value H of the weld height.

[0019] In the adaptive fine grinding operation control method described above, the height of point e is higher than the low point of the weld seam elevation.

[0020] In the adaptive fine grinding operation control method described above, the height of point e is calculated based on the intersection of the extension lines of the curves on both sides of the weld; the extension line is the overall trend line of the curves on both sides of the weld.

[0021] The adaptive fine grinding operation control method described above, wherein the number of grinding cycles in the weld grinding area is...

[0022] H1 represents the grinding height of the weld grinding area; X1 represents the set grinding efficiency of the weld grinding area.

[0023] The adaptive fine grinding operation control method described above, wherein the number of grinding cycles in the grinding area of ​​the base material is...

[0024] H2 represents the grinding height of the base material grinding area; X2 represents the set grinding efficiency of the base material grinding area.

[0025] In the adaptive fine grinding operation control method described above, the grinding efficiencies X1 and X2 are set based on data collected in the experiment; the grinding efficiency is the grinding depth per unit time.

[0026] The adaptive fine grinding operation control method described above, wherein the feed rate H in the grinding zone... N1 For H N1 =H1 / N1; When the number of grinding cycles N1+N2 is odd, the feed rate H in the grinding area is... N2 For H N2 =H2 / N2; When the number of grinding cycles N1+N2 is even, the feed rate H in the grinding area is... N2 For H N2 =H2 / (N2+1).

[0027] The adaptive fine grinding operation control method described above, wherein the calculation method for the fine grinding parameters includes at least the following steps:

[0028] In the weld joint straightness curve, S1 is set along the axial displacement direction of the rail and the Y-axis is set perpendicular to the grinding surface, serving as reference coordinates for calculating fine grinding parameters; the center line of the X-axis coordinates is the weld of the rail.

[0029] S2: Select two endpoints a and b along the X-axis for the fine grinding range; the position between points a and b is the range of fine grinding; based on the straightness curve, select two endpoints c and d between points a and b, where point c is the actual position of the left base material and point d is the actual position of the right base material, and the height difference between points c and d is the misalignment of the rail head.

[0030] S3: Obtain the rail head top surface straightness value a1 based on the straightness curve of the rail welded joint.

[0031] S4: Calculate the grinding height H1 in the weld seam clearance area; calculate the grinding height H2 in the base material area;

[0032] S5: Calculate the number of grinding operations N1 for the weld seam elevation area; calculate the number of grinding operations N2 for the base material area;

[0033] S6: Calculate the grinding feed rate H in the weld seam height area. N1 ; Calculate the grinding feed rate H in the base material area N2 .

[0034] In the adaptive fine grinding operation control method described above, in step S3, the flatness value a1 of the rail head top surface is obtained by calculating point e based on the intersection of the extension lines of the curves on both sides of the weld; taking point e as the center, 0.5m is measured on each side at the corresponding extension line as the farthest point, and the line connecting the two farthest points is taken as the x-axis. Then the horizontal height difference between point e and the x-axis is the flatness value a1 of the rail head top surface.

[0035] The adaptive fine grinding operation control method described above, wherein the fine grinding range is not less than 200 mm.

[0036] In the adaptive fine grinding operation control method described above, the method for controlling the fine grinding mill using fine grinding parameters involves automatically inputting the fine grinding parameters into the fine grinding mill; controlling the fine grinding mill to first use a feed rate H N1 Grinding count N1; after completing N1 feeds, switch to pressing H. N2 The feed value is adjusted until the grinding is completely finished.

[0037] A system based on any of the above adaptive fine grinding operation control methods includes at least:

[0038] Straightening machine measuring head: measures and obtains the straightness curve data of the rail joint to be finely ground and saves it;

[0039] Industrial computer: retrieves previously saved final straightening and flatness curve data to generate a flatness curve; performs analysis and calculations based on the flatness curve; and obtains fine grinding parameters;

[0040] Fine grinding mill programmable controller: Fine grinding parameters are automatically input into the control program of the programmable controller through an automatic information communication device;

[0041] Fine grinding mill working head: Start the fine grinding mill and automatically complete the fine grinding operation according to the control program of the programmable controller.

[0042] In the system of the adaptive fine grinding operation control method described above, the straightening machine measuring head can be a laser measuring type or an eddy current measuring type.

[0043] The system of the adaptive fine grinding operation control method described above, wherein the industrial computer can display the generated flatness curve.

[0044] The system of the adaptive fine grinding operation control method described above, wherein the rail joint to be fine ground moves from the straightener to the fine grinding mill via a roller conveyor.

[0045] The technical effects of this invention are significant. First, by utilizing the straightening machine above the precision grinding mill to calculate the straightness curve obtained during the straightening process, the invention provides more accurate precision grinding parameters compared to manually setting them. Simultaneously, data communication technology is used to automatically transmit these parameters to the precision grinding mill controller, allowing the mill to automatically execute the parameters and perform the grinding operation. This method effectively refines the grinding amount for each grinding operation, greatly improving the grinding efficiency of the equipment.

[0046] In addition, by effectively subdividing the grinding amount for each grinding operation, the present invention improves the grinding efficiency of the equipment and overcomes the defect of machine stalling caused by excessive cutting depth in the prior art, effectively preventing the phenomenon of not being able to complete the operation in one go due to excessive grinding amount.

[0047] Another technical advantage of this invention is that it enables the calculation of processing parameters for different precision-grinding parts and surfaces of the rail, thereby achieving a finer breakdown of processing parameters and significantly improving the efficiency of precision grinding. This also facilitates the improvement of processing accuracy.

[0048] The adaptive fine grinding operation control method provided by this invention can be used in the application environment of fixed equipment in rail welding plants, as well as in the fine grinding process of large-scale series equipment on production lines. Furthermore, based on existing rail welding base production equipment, it enables adaptive control of the fine grinding operation with minimal additional software and hardware costs. Attached Figure Description

[0049] Figure 1 The present invention provides a straightness curve for the top surface of a rail head;

[0050] Figure 1.1 A partial enlargement of the straightness curve of the top surface of the rail head according to the present invention;

[0051] Figure 1.2 Schematic diagram 1.1 of the straightness curve of the top surface of the rail head of the present invention;

[0052] Figure 2 Figure 1 Straightness curve of the working edge of the central rail;

[0053] Figure 3 Figure 1 Straightness curve of the non-working edge of the central rail;

[0054] Figure 4 A schematic diagram of the precision grinding control system of this invention.

[0055] Explanation of reference numerals in the attached figures

[0056] 10: Weld; 11: Boss; L: Width of the weld height after rough grinding;

[0057] 20: Straightening machine measuring head; 30: Industrial computer; 40: Fine grinding machine programmable controller;

[0058] 50: Grinding mill working head.

[0059] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances. Detailed Implementation

[0060] like Figures 1 to 3 As shown, this invention provides an adaptive fine grinding operation control method based on the rail straightening curve. The method involves processing the straightening curve data measured during the rail straightening process to obtain the straightness curve of the rail welded joint; calculating fine grinding parameters based on the straightness curve; and using these fine grinding parameters to control the fine grinding machine to automatically perform the fine grinding operation. The fine grinding parameters include at least the number of grinding passes and the feed rate.

[0061] The technical effects of this invention are significant. First, by utilizing the straightening machine above the precision grinding mill to calculate the straightness curve obtained during the straightening process, the invention provides more accurate precision grinding parameters compared to manually setting them. Simultaneously, data communication technology automatically transmits these parameters to the precision grinding mill controller, allowing the mill to automatically execute the parameters and perform the grinding operation. This method effectively refines the grinding amount for each operation, greatly improving the grinding efficiency of the equipment.

[0062] In addition, by effectively subdividing the grinding amount for each grinding operation, the present invention improves the grinding efficiency of the equipment and overcomes the defect of machine stalling caused by excessive cutting depth in the prior art, effectively preventing the phenomenon of not being able to complete the operation in one go due to excessive grinding amount.

[0063] In a specific embodiment of the present invention, the straightening curve measured during the rail straightening process is composed of the data from the last curve measuring the straightness of the rail joint. This accurately reflects the straightness state of the rail joint before fine grinding.

[0064] The straightening curve data measured during the rail straightening process consists of the rail joint straightness curve measured by the straightening machine measuring head 20.

[0065] It should be noted that the rail straightening process described in this invention uses any conventional measuring device to measure the straightness curve of the rail joint.

[0066] See Figure 1 The diagram illustrates a top flatness curve measured in a specific embodiment of the present invention. The method for calculating the fine grinding parameters of the present invention is as follows: based on the flatness curve, calculate the grinding height H1 of the weld 10 grinding area and the grinding height H2 of the base material grinding area; based on the grinding heights H1 and H2, calculate the grinding times N1 of the weld 10 grinding area and N2 of the base material grinding area; based on the grinding times N1 and N2, calculate the feed rate H of the weld 10 grinding area and the base material grinding area. N1 and H N2 These constitute the fine grinding parameters that control the fine grinding mill.

[0067] In one specific embodiment of the present invention, the grinding area of ​​the base material is set according to the rail model.

[0068] like Figure 1.1 As shown, in this embodiment, the grinding area of ​​weld 10 is the width L of the raised section of weld 10 after rough grinding; the raised section of weld 10 is the boss 11 that suddenly rises from the center of the straightness curve. Thus, the processing curve area of ​​the present invention is divided into three parts: the left curve, the right curve, and the central boss curve.

[0069] In one embodiment of the present invention, the grinding height H1 of the weld 10 grinding area is obtained by subtracting the calculated height value of point e from the highest point value H of the weld 10. Since point e in this invention serves as a reference point for calculating the grinding height H1 of the weld 10 grinding area and the grinding height H2 of the base material grinding area, it is used to calculate the feed rate for both grinding processes. The applicant has demonstrated in experiments that slightly higher or lower points on point e in this invention do not significantly affect the specific construction effect. Therefore, the height of point e can be set using different methods or calculated using different algorithms.

[0070] In one possible embodiment of the present invention, the height of point e is set higher than the low point of the weld 10.

[0071] In another possible embodiment of the present invention, the height of point e is calculated based on the intersection of the extension lines of the curves on both sides of weld 10; the extension line E is the overall trend line of the curves on both sides of weld 10. Figure 1.1 As shown, in this invention, the curves on both sides of weld 10 are irregular, and the overall curves show a clear trend of being high in the middle and low on both sides.

[0072] In one embodiment of the present invention, the number of grinding times N1 of the weld seam 10 grinding area is: N1 = H1 / X1. Wherein, H1 is the grinding height of the weld seam 10 grinding area; X1 is the set grinding efficiency of the weld seam 10 grinding area.

[0073] The number of grinding cycles N2 for the base material grinding area is: N2 = H2 / X2. Where H2 is the grinding height of the base material grinding area; X2 is the set grinding efficiency of the base material grinding area.

[0074] In a specific embodiment of the present invention, the polishing efficiencies X1 and X2 are set based on data collected in the experiment; the polishing efficiency is the polishing depth per unit time.

[0075] In a specific embodiment of the present invention, the feed rate H in the grinding area N1 For H N1 =H1 / N1; When the number of grinding cycles N1+N2 is odd, the feed rate H in the grinding area is... N2 For H N2 =H2 / N2; When the number of grinding cycles N1+N2 is even, the feed rate H in the grinding area is... N2 For H N2 =H2 / (N2+1).

[0076] In this invention, the method for calculating the fine grinding parameters includes at least the following steps:

[0077] In the straightness curve of the weld joint, S1 sets the X-axis along the axial displacement direction of the rail and the Y-axis perpendicular to the grinding surface as reference coordinates for calculating the fine grinding parameters. The center line of the X-axis is the weld 10 of the rail.

[0078] S2: Select two endpoints a and b along the X-axis for the fine grinding range; the position between points a and b is the range of fine grinding; based on the straightness curve, select two endpoints c and d between points a and b, where point c is the actual position of the left base material and point d is the actual position of the right base material, and the height difference between points c and d is the misalignment of the rail head.

[0079] S3: Obtain the rail head top surface straightness value a1 based on the straightness curve of the rail welded joint;

[0080] S4: Calculate the grinding height H1 in the weld seam 10 clearance area; calculate the grinding height H2 in the base material area;

[0081] S5: Calculate the number of grinding operations N1 for the weld seam 10 height area; calculate the number of grinding operations N2 for the base material area;

[0082] S6: Calculate the grinding feed rate H for the weld seam 10 height retention area. N1 ; Calculate the grinding feed rate H in the base material area N2 .

[0083] In a specific embodiment of the present invention, in step S3, the flatness value a1 of the rail head top surface is obtained by calculating point e based on the intersection of the extension lines of the curves on both sides of weld 10; taking point e as the center, 0.5m is measured on each side at the corresponding extension line as the farthest point, and the line connecting the two farthest points is taken as the x-axis. Then the horizontal height difference between point e and the x-axis is the flatness value a1 of the rail head top surface.

[0084] In this embodiment, the range of fine grinding between points a and b is calculated based on the flatness value a1 of the top surface of the rail head and the value specified in the standard; the range of fine grinding is not less than 200mm.

[0085] In this invention, the method for controlling the fine grinding mill using the fine grinding parameters involves automatically inputting the fine grinding parameters into the fine grinding mill; controlling the fine grinding mill to first use a feed rate H N1 Grinding count N1; after completing N1 feeds, switch to pressing H. N2 The feed value is adjusted until the grinding is completely finished.

[0086] In summary, this invention, by adaptively adjusting the operating parameters based on the straightness curve of the rail before the fine grinding mill operation, can reduce the requirements for the accuracy of rough grinding and straightening operations, enabling data exchange and sharing between production line equipment, thereby improving the overall operating efficiency of the production line.

[0087] Figure 2 and Figure 3 The ones shown are respectively Figure 1 The invention relates to the left and right straightness curves of the same rail. The grinding parameters for the left and right sides of the rail are as follows: Figure 2 (Left side of the rail) and Figure 3 The straightness curve of the rail (on the right side) is used to calculate the fine grinding parameters. The calculation method can be the same as the previously mentioned method for fine grinding parameters of the rail top, which will not be repeated here. Because this invention calculates the grinding parameters for each part based on the straightness curve of different grinding areas, it achieves a more precise subdivision of the processing parameters for different processing areas, greatly improving processing efficiency and contributing to improved processing accuracy.

[0088] like Figure 4 As shown, the present invention also provides a system based on any of the above-mentioned adaptive fine grinding operation control methods, comprising at least:

[0089] The straightening machine measuring head 20 measures and obtains the straightness curve data of the rail joint to be finely ground and saves it.

[0090] Industrial computer 30: calls up the previously saved final straightening and flatness curve data to generate a flatness curve; performs analysis and calculation based on the flatness curve to obtain the fine grinding parameters;

[0091] The fine grinding mill programmable controller 40 automatically inputs the fine grinding parameters into the control program of the programmable controller through an automatic information communication device;

[0092] Fine grinding mill working head 50: Start the fine grinding mill and automatically complete the fine grinding operation according to the control program of the programmable controller.

[0093] In this invention, the straightening machine measuring head 20 can be a laser measuring type, an eddy current measuring type, or other conventional measuring devices.

[0094] In this invention, the industrial computer 30 can display the generated flatness curve.

[0095] In this invention, the rail joint to be finely ground moves from the straightening machine to the fine grinding machine via a roller conveyor and enters the fine grinding station for fine grinding.

[0096] The technical effect of the adaptive fine grinding operation control method of the present invention is that it can achieve adaptive control of the fine grinding operation based on the existing rail welding base production equipment with minimal additional software and hardware costs.

[0097] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. An adaptive fine grinding operation control method based on the rail straightening curve, characterized in that, By processing the straightening curve data measured during the rail straightening process, the straightness curve of the rail welded joint is obtained; the fine grinding parameters are calculated based on the straightness curve; the fine grinding parameters are used to control the fine grinding machine to automatically perform fine grinding operations; the fine grinding parameters include at least the number of grinding cycles and the feed rate of the fine grinding machine. The straightening curve data measured during the rail straightening process consists of the last curve data for measuring the straightness of the rail. The straightening curve data measured during the rail straightening process consists of the rail joint straightness curve measured by the straightening machine's measuring head. In the straightness curve of the weld joint, the X-axis is set along the axial displacement direction of the rail, and the Y-axis is set perpendicular to the grinding surface, serving as reference coordinates for calculating the fine grinding parameters; the center line of the X-axis coordinates is the weld of the rail. Select two endpoints a and b along the X-axis for the fine grinding range; the position between points a and b is the range of fine grinding; based on the straightness curve, select two endpoints c and d between points a and b, where point c is the actual position of the left base material and point d is the actual position of the right base material, and the height difference between points c and d is the misalignment of the rail head. Point e is calculated based on the intersection of the extension lines of the curves on both sides of the weld. Point e is taken as the center, and 0.5m is measured on each side of the corresponding extension line as the farthest point. The line connecting the two farthest points is taken as the x-axis. The difference in horizontal height between point e and the x-axis is the straightness value a1 of the top surface of the rail head. The extension line is the overall trend line of the curves on both sides of the weld. Based on the flatness value a1 of the top surface of the rail head and the value specified in the standard, calculate the range of fine grinding between points a and b; Calculate the grinding height H1 of the weld grinding area. The grinding height H1 of the weld grinding area is obtained by subtracting the calculated height value of point e from the highest point value H of the weld height.

2. The adaptive fine grinding operation control method according to claim 1, characterized in that, The rail straightening process is described above, in which the straightness curve of the rail joint is measured using any conventional measuring device.

3. The adaptive fine grinding operation control method according to claim 1, characterized in that, The calculation method for the fine grinding parameters is as follows: based on the flatness curve, calculate the grinding height H1 of the weld grinding area and the grinding height H2 of the base material grinding area; based on the grinding heights H1 and H2, calculate the grinding times N1 of the weld grinding area and N2 of the base material grinding area; based on the grinding times N1 and N2, calculate the feed rate H of the weld grinding area and the base material grinding area. N1 and H N2 These constitute the fine grinding parameters that control the fine grinding mill.

4. The adaptive fine grinding operation control method according to claim 3, characterized in that, The grinding area of ​​the base material is set according to the rail model.

5. The adaptive fine grinding operation control method according to claim 3, characterized in that, The weld grinding area refers to the width of the weld elevation after rough grinding; the weld elevation is a small step where the center of the straightness curve suddenly rises.

6. The adaptive fine grinding operation control method according to claim 1, characterized in that, The height of point e is higher than the lowest point of the weld seam.

7. The adaptive fine grinding operation control method according to claim 3, characterized in that, The number of grinding times N1 in the weld grinding area: H1 represents the grinding height of the weld grinding area; X1 represents the set grinding efficiency of the weld grinding area.

8. The adaptive fine grinding operation control method according to claim 3, characterized in that, The number of grinding times N2 in the grinding area of ​​the base material: H2 represents the grinding height of the base material grinding area; X2 represents the set grinding efficiency of the base material grinding area.

9. The adaptive fine grinding operation control method according to claim 7 or 8, characterized in that, The polishing efficiencies X1 and X2 are set based on the data collected in the experiment; the polishing efficiency is the polishing depth per unit time.

10. The adaptive fine grinding operation control method according to claim 1 or 3, characterized in that, The feed rate H of the grinding area N1 For H N1 =H1 / N1; When the number of grinding cycles N1+N2 is odd, the feed rate H in the grinding area is... N2 For H N2 =H2 / N2; When the number of grinding cycles N1+N2 is even, the feed rate H in the grinding area is... N2 For H N2 =H2 / (N2+1).

11. The adaptive fine grinding operation control method according to claim 1 or 3, characterized in that, The method for calculating the fine grinding parameters includes at least the following steps: Calculate the grinding height H2 of the base material area; Calculate the number of grinding operations N1 for the weld seam elevation area; calculate the number of grinding operations N2 for the base material area; Calculate the grinding feed rate H in the weld seam height area. N1 ; Calculate the grinding feed rate H in the base material area N2 .

12. The adaptive fine grinding operation control method according to claim 11, characterized in that, The range of the fine grinding process is not less than 200mm.

13. The adaptive fine grinding operation control method according to claim 1 or 3, characterized in that, The method for controlling the fine grinding mill using the aforementioned fine grinding parameters involves automatically inputting the fine grinding parameters into the fine grinding mill; controlling the fine grinding mill to first use a feed rate H N1 Grinding count N1; after completing N1 feeds, switch to pressing H. N2 The feed value is adjusted until the grinding is completely finished.

14. A system based on the adaptive fine grinding operation control method of claim 1, comprising at least: Straightening machine measuring head: measures and obtains the straightness curve data of the rail joint to be finely ground and saves it; Industrial computer: retrieves previously saved final straightening and flatness curve data to generate a flatness curve; performs analysis and calculations based on the flatness curve; and obtains fine grinding parameters; Fine grinding mill programmable controller: Fine grinding parameters are automatically input into the control program of the programmable controller through an automatic information communication device; Fine grinding mill working head: Start the fine grinding mill and automatically complete the fine grinding operation according to the control program of the programmable controller.

15. The system of the adaptive fine grinding operation control method as described in claim 14, characterized in that, The measuring head of the straightening machine can be either laser measuring or eddy current measuring.

16. The system of the adaptive fine grinding operation control method as described in claim 14, characterized in that, The industrial computer can display the generated flatness curve.

17. The system of the adaptive fine grinding operation control method as described in claim 14, characterized in that, The rail joint to be finely ground moves from the straightening machine to the fine grinding machine via a roller conveyor.

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