System and method for machining a rail by means of a liquid jet

Abstract

The invention relates to a system (2) for machining a rail (3) of a railway track (4) by means of a liquid jet (13), comprising a liquid container (7) for storing a working liquid (8), a pressure generating device (11) for applying ultra-high pressure to the working liquid (8), and a nozzle assembly (12) for generating the liquid jet (13). The nozzle assembly (12) is controlled by means of a control device (17), which is designed to change at least one working parameter (a1... αn) in order to adapt the liquid jet (13) to a specified material removal (18) on a surface (19) of the rail (3). Thus, a mere cutting process is not carried out; rather, there is a defined material removal (18) on the rail surface (19) as a result of the correspondingly adapted liquid jet (13).

Description

[0001] System and method for machining a rail using a liquid jet

[0002] The invention relates to a system for machining a rail of a single-track ice track using a liquid jet, comprising a liquid container for storing a working fluid, a pressure generating device for subjecting the working fluid to ultra-high pressure, and a nozzle arrangement for generating the liquid jet. Furthermore, the invention relates to a method for machining a rail using the system.

[0003] The track's superstructure is subject to continuous wear and tear due to use and weathering, necessitating regular maintenance. In particular, the position of a railway track and the surface of the rails are inspected at specified intervals. Positional errors are corrected using a tamping machine. Various methods are known for eliminating rail defects, particularly existing rolling contact fatigue damage.

[0004] During rail machining, material is specifically removed from the surface of the respective rail head. The amount of material removed and the resulting geometry depend on the type of machining. The goal of each machining process is controlled material removal in order to achieve the desired rail geometry. The achieved surface quality also plays a key role in service life, ride comfort, and noise development. Residual compressive stresses in the rail surface are desirable because they impede crack formation. However, certain rail machining methods such as grinding or milling can cause residual tensile stresses to occur in the rail surface.

[0005] WO 2020 / 060962 A1 discloses a system for rail processing in which material is removed using an ultra-high-pressure liquid jet with the addition of an abrasive. The ultra-high-pressure liquid jet is used as a cutting tool to separate surface segments along a rail head. Fanning out of the liquid jet is undesirable because it makes precise cutting more difficult. As the cutting depth increases, an inhomogeneous cutting pattern is created with clear grooves along the cutting surfaces. Individual zones of these cutting surfaces have different surface qualities. The respective surface quality depends on the cutting speed, the amount of abrasive added and the cutting depth.

[0006] The invention is based on the object of improving a system of the type mentioned above so that targeted material removal and a uniform surface quality can be achieved. Furthermore, it is an object of the invention to provide a corresponding method.

[0007] According to the invention, these objects are achieved by the features of independent claims 1 and 10. Dependent claims specify advantageous embodiments of the invention.

[0008] The system is characterized by a control of the

[0009] Nozzle arrangement by means of a control device which is used for

[0010] Changing at least one working parameter is set up to adapt the liquid jet to a predetermined material removal on a surface of the rail. This means that there is no mere cutting process as known from the prior art, but rather a defined material removal on the rail surface as a result of the correspondingly adapted liquid jet. The rail is therefore not cut, but blasted, with the liquid jet directed onto the rail surface dissolving a large number of material particles from the rail surface within a specific effective duration and in an extended effective area.

[0011] The at least one variable working parameter determines the material-removing effect of the liquid jet, in particular a planar extent and a resulting depth of material removal. A change in the working parameter changes the amount of material removed. In this way, the desired shaping of the rail surface is achieved through controlled and reliable material removal. For example, a nozzle shape with a round outlet opening causes a removal depth on the rail surface along an effective area cross-section, the profile of which approximates a normal distribution. When the nozzle is stationary, a circular depth relief is created which is deepest in the middle and merges continuously into the untreated area of ​​the rail surface.

[0012] The material removal to be achieved is specified in the control device. Specifically, in the control device a corresponding setting of at least one working parameter is assigned to each specified material removal. In this way, the control device sets the variable working parameter so that the specified material removal, i.e. the desired material-removing effect on the blasted surface of the rail, is achieved by means of the resulting liquid jet. In the simplest case, the material removal is specified by an operator. For this purpose, the control device is connected to an input device and a display device. In particular, the control device comprises a digital memory unit in which a specification of the material removal is stored as a function of a rail profile selected by the operator and / or another selection or input.

[0013] This type of processing enables precise material removal to achieve the desired rail surface shape. The blasting process also generates residual compressive stresses in the processed areas of the rail surface. These residual compressive stresses reduce the risk of cracks and other damage when the rail is subsequently subjected to stress by regular traffic. The surface quality achieved with the system according to the invention increases the service life of the rail. Furthermore, travel comfort is increased and noise levels are reduced when the rails are used.

[0014] Different functions of the nozzle arrangement can be used to achieve the desired surface shape of the rail. For example, several nozzles with different material-removing effects are used simultaneously. In another variant, a nozzle is moved along the rail, with the material-removing effect varying, particularly to achieve a desired rail profile. A combination of these functions increases the working speed and the application possibilities. The system according to the invention can be used both for preventative rail machining with uniform material removal and for reprofiling to restore a desired rail cross-profile. Initial rail machining to remove mill scale or to remove scale represents a further application.

[0015] In particular, the system is integrated into a rail vehicle or a road-rail vehicle. The vehicle comprises a vehicle frame that can be moved on rail bogies along the track to be serviced. The system components are arranged on the vehicle frame and / or in a superstructure or car body of the vehicle.

[0016] In an advantageous development of the system, an abrasive is added to the working fluid when the fluid jet is generated, wherein in particular a proportion added to the fluid and / or a property of the abrasive is specified as a variable working parameter. The addition of the abrasive increases the material removal rate. In this way, with an otherwise constant nozzle arrangement, the material-removing effect can be varied by the type and / or quantity of the added abrasive. The abrasive acting on the rail surface together with the fluid jet also increases the induced residual compressive stresses.

[0017] The abrasive is preferably stored in a separate storage tank. The system is further improved by a device for collecting the working fluid beneath the rail being machined. The collected working fluid is either immediately cleaned using a filter and returned to the fluid tank, or it is temporarily stored in a dirt container and then processed for reuse. If necessary, the abrasive is filtered out and also reused. Processing and reuse reduces the amount of working fluid and abrasive that needs to be carried along. In addition, collecting the used working fluid prevents more fine material from getting into the track superstructure.

[0018] A further improvement relates to advantageous adjustment options for the system, wherein a nozzle spacing and / or a nozzle inclination and / or a movement speed relative to the surface of the rail and / or a fluid pressure and / or a fluid flow and / or a nozzle diameter and / or a nozzle shape are specified as variable working parameters. To change the nozzle spacing, the nozzle inclination and the movement speed, a positioning device for the respective nozzle is used. This positioning device comprises adjusting elements and drives for carrying out a relative movement of the respective nozzle with respect to the rail to be processed. In addition, the positioning device serves to compensate for a lateral offset which occurs, for example, in a track curve when the nozzle arrangement is arranged on a vehicle frame between two rail bogies.

[0019] To change the fluid pressure and flow rate, the pressure generation device includes a pump for generating system pressure and hydraulic elements such as accumulators, valves, throttles, etc. for adjusting pressure and flow. The nozzle diameter and shape are changed either by an adjustable nozzle or by a device for the automated exchange of nozzle inserts within the nozzle arrangement.

[0020] The distance of the nozzles to the rail surface is preferably in a range between 1 cm and 30 cm. The movement speed of the nozzle arrangement relative to the rail is preferably in a range between 30 m / h and 5000 m / h, in particular 500 m / h. The inclination of the nozzle with respect to the rail surface is preferably in a range between 30° and 90°, in particular between 45° and 90°. The nozzle diameter is preferably selected between 0.07 mm and 1 mm. The nozzle shape is essentially determined by the shape of the nozzle outlet opening. This is preferably round or oval. The fluid pressure is preferably between 130 MPa and 700 MPa, in particular 400 MPa. The flow rate of the working fluid is preferably between 0.5 l / min and 5 l / min. The preferred abrasive addition rate is between 30g / min and 1000g / min per nozzle.

[0021] The system's efficiency is enhanced by several nozzles arranged side by side, with each nozzle assigned at least one of its own adjustable operating parameters. The fluid jets generated by the nozzles act simultaneously on the rail surface, resulting in cumulative material removal.

[0022] Advantageously, the nozzles are designed to produce fanned liquid jets, with the fanned liquid jets overlapping when viewed in one working direction. As a rule, the working direction corresponds to the longitudinal direction of the rail. The nozzles are then spaced apart from one another in the transverse direction of the rail. In particular, the nozzles are also offset from one another in the longitudinal direction of the rail so that the liquid jets do not collide and do not influence one another. However, there is an overlap in the effect because a leading nozzle has an effective area on the rail surface which is partially overlaid by the effective area of ​​an adjacent trailing nozzle. By superposing the material removal effect in the overlapping areas, a continuous course of material removal across all nozzles can be achieved.The control of the nozzles is coordinated in such a way that either a desired removal profile or a uniform removal with a constant removal depth results.

[0023] To further improve surface quality, a grinding device, particularly for oscillating rail grinding, can be optionally arranged downstream of the nozzle assembly. This additional device smooths out any irregularities remaining after blasting. The grinding device operates with very low material removal and negligible heat input. The advantageous residual compressive stresses are maintained.

[0024] In a further improvement, a final measuring device for recording the achieved rail profile is arranged downstream of the nozzle arrangement. This records the reprofiling carried out for documentation purposes and / or for any subsequent processing. Particularly for optimal reprofiling of the rail, a measuring device for recording the rail profile is arranged upstream of the nozzle arrangement. This measuring device records the actual profile of the rail in the transverse direction immediately before processing. Optical measuring devices such as line-section sensors are preferably used for this purpose.

[0025] A controlled work process is particularly advantageous, whereby a target profile of the rail is stored in a memory device, an evaluation device is arranged to compare the recorded rail profile with the target profile and the control device is coupled to the evaluation device for specifying at least one work parameter depending on the comparison carried out. This enables precise adjustment of the removal to achieve the desired rail profile, both in the transverse direction and in the longitudinal direction of the rail. The data resulting from the measurement and the subsequent comparison form the basis for position control and work parameter selection of the individual nozzles. This ensures targeted material removal at each processing point.

[0026] In the method according to the invention for machining a rail of a railway track using the described system, the nozzle arrangement is brought into a predetermined position relative to the rail, wherein at least one working parameter is changed by means of the control device to adapt the liquid jet to a predetermined amount of material to be removed from a surface of the rail. In this way, targeted material is removed from the rail surface for reprofiling the rail or for preventative rail machining. In an advantageous development of the method, several nozzles arranged next to one another with differently set working parameters are moved along the rail. This increases the efficiency of the machining because targeted material removal takes place using several nozzles at the same time. The nozzles are spaced apart transversely to the working direction and, in particular, are offset from one another in the working direction.Due to the offset arrangement, the liquid jets do not collide with each other and still achieve overlapping effective areas on the rail surface.

[0027] To advantageously increase the processing quality during rail reprofiling, the rail profile is measured using a measuring device prior to rail processing. The measured rail profile is compared with a stored target profile using an evaluation device, and at least one working parameter is specified based on the comparison. This method ensures the least possible material removal to achieve the desired rail cross-section.

[0028] In a further improvement of the process, the resulting rail profile is recorded using a final measuring device after rail processing. This process serves both to document the processing performed and as a data basis for any subsequent processing.

[0029] In the course of advantageous post-processing, after material removal by means of the liquid jet, the surface of the rail is machined using a grinding device, particularly by oscillating grinding. The resulting surface quality is particularly high, with a small amount of material removal being sufficient to smooth out any remaining irregularities after the jet processing.

[0030] A further reduction of surface effects is achieved through targeted subsequent loading using a rolling wheel. In this process, a wheel rolling along the rail is subjected to a defined load. The result of this process is reduced surface roughness and, where appropriate, smoothed out unevenness.

[0031] To ensure consistent machining quality, a wear parameter is advantageously recorded and evaluated for each nozzle, particularly by measuring a volume flow and / or a pressure of the working fluid flowing through the respective nozzle. For this purpose, each nozzle is assigned a corresponding sensor arrangement, wherein the respective sensor arrangement is connected in particular to a computing device for generating a wear parameter. The detection of wear on the respective nozzle is important because, for example, an increased nozzle diameter changes the achievable material removal. Wear monitoring, particularly by monitoring the volume flow and the fluid pressure of the respective nozzle, enables early detection.

[0032] Preferably, the system indicates a nozzle that needs to be replaced before changes in material removal reduce the machining quality. For example, the recorded wear parameter is continuously compared with a limit value in the computing device. In combination with a digital wear model, the computing device can estimate the remaining service life of the respective nozzle and display it on an output device.

[0033] The invention is explained below by way of example with reference to the accompanying figures. They show schematically:

[0034] Fig. 1 Rail vehicle with a system for processing a rail,

[0035] Fig. 2 Nozzle arrangement with several nozzles for preventive rail processing,

[0036] Fig. 3 Nozzle arrangement with several nozzles for reprofiling a rail, Fig. 4 Circuit diagram of a work sequence.

[0037] Fig. 1 shows a rail vehicle 1 with a system 2 for machining a rail 3 of a railway track 4. The rail vehicle 1 comprises a vehicle frame 5 which is supported on rail bogies 6 and can be moved on the track 4. The positions of the rail vehicle 1, the track 4 and the elements of the system 2 in space can be determined by means of a Cartesian coordinate system XYZ. A track axis of the track section shown runs parallel to the Z axis. Transverse to this, the X axis is aligned parallel to a track plane. The Y axis points downwards.

[0038] Arranged in the rail vehicle 1 are a liquid container 7 for storing a working fluid 8, in particular water, and an optional storage container 9 for storing an abrasive substance 10. The two containers 7, 9 are connected via lines to a first and an optional second pressure generating device 11. Alternatively, only the liquid container 7 is connected via a line to the respective pressure generating device 11, and the abrasive substance 10 is introduced by means of a Venturi nozzle. Each pressure generating device 11 is assigned a nozzle arrangement 12 for generating at least one liquid jet 13.

[0039] In a simple embodiment, only the first pressure generating device 11 and the associated nozzle arrangement 12 are provided. The working fluid 8 conveyed from the fluid container 7 is subjected to a system pressure by means of the pressure generating device 11, in particular to an ultrahigh pressure in the range from 100 MPa to 700 MPa, preferably between 130 MPa and 600 MPa. The fluid jet 13 is formed in the nozzle arrangement 12.

[0040] Alternatively, several nozzle arrangements 12 can be connected to a common pressure generating device 11. Hydraulic elements for reducing the common system pressure to a respective working pressure are then optionally arranged between the pressure generating device 11 and the respective nozzle arrangement 12.

[0041] In the further developed variant according to Fig. 1, the abrasive 10 conveyed from the storage container 9 is added to the liquid jet 13. The addition preferably takes place in the respective nozzle arrangement 12.

[0042] The respective pressure generating device 11 and the associated nozzle arrangement 12 are fastened to the underside of the vehicle frame 5. The respective nozzle arrangement 12 is adjustable relative to the vehicle frame 5 by means of an associated positioning device 14. The positioning device 14 comprises adjusting elements and drives which act on positioning elements such as slides which are movable relative to one another. The adjustability is provided at least transversely to a working direction 15. Further adjustment options in the working direction 15, in the direction of the track 4 and pivoting and tilting movements which can be carried out relative to the vehicle frame 5 are preferably possible.

[0043] To enable the relative movements, the respective nozzle arrangement 12 is connected to the pressure generating device 11 via a movable high-pressure line 16, in particular via a high-pressure hose. Advantageously, a final pressure generating stage of the pressure generating device 11 is, on the one hand, firmly connected to the nozzle arrangement 12 and, on the other hand, connected via the movable high-pressure line 16 to upstream pressure generating stages of the pressure generating device 11.

[0044] A control device 17 is arranged to control the respective nozzle arrangement 12. Alternatively, several nozzle arrangements 12 are controlled by a common control device 17. According to the invention, the respective control device 17 is designed to change at least one working parameter ai, a2, a3, a4, as, a n , bi , b2, b3, b4, b n , di , d2, d3, d4, d5, d n , v2, v2, v3, v4, v5, v n, Pi , p2, p3, p4, p5, p n , ai , a3, ocs, a n to adapt the liquid jet 13 to a predetermined material removal 18 on a surface 19 of the rail 3.

[0045] What is essential compared to the known state of the art is the superficial removal of the rail material, whereby the at least one working parameter ai ... a n determines the extent of material removal. The liquid jet 13 hits the rail 3 and releases material particles from the rail surface 19 in a flat effective area. The amount of material particles released depends essentially on an impact speed of the liquid jet 13, an impact angle, an exposure time at the respective location and the added abrasive 10. This material-removing effect is influenced by adjusting at least one working parameter ai ... a n. Preferably several working parameters ai ... a n adapted in order to be able to scale the respective material removal 18 more finely.

[0046] Fig. 2 shows an exemplary nozzle arrangement 12 for preventive rail treatment with five nozzles 20 arranged side by side. It shows an upper cross-sectional area of ​​a rail head, onto whose surface 19 the nozzles 20 are directed at approximately equal vertical distances ai ... as. All nozzles 20 have the same shape here. The two outer nozzles 20 are inclined inward. The liquid jets 13 generated by the nozzles 20 each have a line of symmetry 21. Horizontal distances are indicated between the intersection points of these lines of symmetry 21 with the rail surface 19. In the X direction, the horizontal distances bi ... bi are, for example, approximately equal. Distances are also useful in the Z direction so that the liquid jets 13 do not collide and do not influence each other. The inclination of the respective nozzle 20 is set at an angle ai ...«5 is set between a tangent of the rail surface 19 and the associated line of symmetry 21. Each individual geometric variable ai ... a5, bi ... b4, oci ... a5 of this nozzle arrangement 12 is a working parameter, the change of which causes an adjustment of the associated liquid jet 13. Further working parameters are a respective liquid pressure pi ... p5 and a respective liquid flow vi ... v5. All working parameters ai ... a. n can be adjusted individually or in groups by means of the control device 17 so that the material removal 18 effected by the liquid jets 13 occurs as specified. For this purpose, tabular values ​​and / or algorithms are stored in a memory of the control devices 17, which indicate a relationship between the respective working parameter ai ... «5 and the effected material removal 18.

[0047] In the diagram directly below the arrangement shown, the respective material-removing effect is plotted for each nozzle 20. The x-axis runs in the transverse direction of the rail and indicates the locations of the respective material-removing effect. The extent of the respective material-removing effect is visible along the y-axis.

[0048] Because the liquid jets 13 overlap in the working direction 15, seen here in the Z-direction, a superposition of the respective material-removing effects results, as shown in the diagram below. The resulting curve shows the actual material removal 18 across the width of the rail head. The set working parameters ai ... «5 achieve an almost uniform, planar material removal 18.

[0049] The nozzle arrangement 12 in Fig . 3 is by means of the

[0050] Control device 17 is set for reprofiling the rail 3. Here, all nozzles 20 are arranged in the X-direction with approximately equal horizontal distances bi ... bi from one another, although different horizontal distances bi ... bi may also be expedient. The nozzles 20 are preferably offset in the Z-direction so that the liquid jets 13 do not influence one another and nevertheless have overlapping effective areas. The vertical distances ai ... as between the nozzles 20 and the rail surface 19 differ from one another. This and different nozzle shapes as well as different nozzle diameters di ... ds result in different liquid jets 13, each with its own effect. In addition, a separate liquid pressure p is required for each nozzle 20. x ... p5and its own liquid flow v x ... v5 discontinued .

[0051] Below the illustrated arrangement, the diagrams are as shown in Fig. 2. The respective material-removing effects of the nozzles 20 in the upper diagram exhibit significant differences. Superposition results in the course of the material removal 18 in the transverse direction of the rail shown in the lower diagram. In the case shown, the material removal 18 is greater in the edge zones to achieve the desired rail profile.

[0052] The work sequence shown in Fig. 4 relates in particular to a reprofiling of the rail 3, wherein the components of the system 2 shown in Fig. 1 are used. A first measuring device 22 for detecting the rail profile is arranged in front of the nozzle assemblies 12 in the working direction 15. A second measuring device 22 for an intermediate measurement is arranged between the nozzle assemblies 12 and a final measuring device 23 is located at the rear end of the rail vehicle 1. Furthermore, a grinding device 24 is arranged for optimising the results achieved by means of the nozzle assemblies 12. An oscillating grinding unit is preferably used which removes any surface grooves with very little material removal.

[0053] The respective measurement of the rail cross-section is advantageously carried out using light-section sensors. A light line is projected along the rail cross-section using at least one laser. This light line is recorded by at least one high-performance camera and converted into 2D coordinates in a computing unit. The measurement data is processed and visualized in real time.

[0054] A preliminary measurement 25 performed by the first measuring device 22 provides measurement data of an actual profile 26 of the rail 3. These measurement data are fed in real time to an evaluation device 27.

[0055] In the next method step, a computational comparison 28 of the actual profile 26 with the target profile 29 is carried out by means of a computing unit of the evaluation device 27 or with a coupled computing device. For this purpose, the target profile 29 is stored in a memory device 30 of the evaluation device 27. On the basis of the calculated comparison data, a material removal calculation 31 is carried out to determine the required material removal 18. Using these evaluation data, the parameters are set 32 ​​in the evaluation device 27 or preferably in the control device 17 coupled to it to adapt the respective liquid jet 13 to the specified material removal 18. In a further development, a longitudinal profile measurement of the rail 3 is also carried out as a basis for the rail processing.This longitudinal profile measurement aims on the one hand at detecting periodic profile deviations such as corrugations or slip waves and on the other hand at detecting singular longitudinal profile deviations such as weld joints with an elevation or a dent.

[0056] Beginning with the preliminary measurement 25 and continuing through to parameter definition 32 and control, the process steps are continuously repeated while the rail vehicle 1 moves forward in the working direction 15. If a second measuring device 22 and a second nozzle arrangement 12 are present, an intermediate measurement is also performed during each run, followed by parameter definition 32 for the second nozzle arrangement 12. Finally, a final measurement 33 is performed using the final measuring device 23.

Claims

Patent claims 1. System (2) for processing a rail (3) of a single-track ice track (4) by means of a liquid jet (13), comprising a liquid container (7) for storing a working liquid (8), a pressure generating device (11) for applying ultra-high pressure to the working liquid (8) and a nozzle arrangement (12) for generating the liquid jet (13), characterized by a control of the nozzle arrangement (12) by means of a control device (17) which is designed to change at least one working parameter (ai ... a n ) is arranged to adapt the liquid jet (13) to a predetermined material removal (18) on a surface (19) of the rail (3).

2. System (2) according to claim 1, characterized in that an abrasive substance (10) is added to the working fluid (8) during the generation of the fluid jet (13) and that in particular a proportion added to the fluid (8) and / or a property of the abrasive substance (10) is predetermined as a variable working parameter.

3. System (2) according to claim 1 or 2, characterized in that a nozzle spacing (ai ... a n , bi ... b n ) and / or a nozzle inclination (ai ... a n ) and / or a movement speed with respect to the surface (19) of the rail (3) and / or a fluid pressure (pi ... p n ) and / or a liquid flow (vi ... v n ) and / or a nozzle diameter (di ... d n ) and / or a nozzle shape is specified as a variable working parameter.

4. System (2) according to one of claims 1 to 3, characterized in that several nozzles (20) are arranged next to one another and that each nozzle (20) has at least one variable working parameter (ai ... a n ) is assigned.

5. System (2) according to claim 4, characterized in that the nozzles (20) are designed to generate fanned liquid jets (13) and that the fanned liquid jets overlap when viewed in a working direction.

6. System (2) according to one of claims 1 to 5, characterized in that a grinding device (24), in particular for oscillating rail grinding, is arranged downstream of the nozzle arrangement (12).

7. System (2) according to one of claims 1 to 6, characterized in that a measuring device (23) for detecting an achieved rail profile is arranged downstream of the nozzle arrangement (12).

8. System (2) according to one of claims 1 to 7, characterized in that the nozzle arrangement (12) is provided with a measuring device (22) for detecting a rail profile (26) is arranged upstream.

9. System (2) according to claim 8, characterized in that a target profile (29) of the rail (3) is stored in a memory device (30), that an evaluation device (27) is arranged for comparing the detected rail profile (26) with the target profile (29) and that the control device (17) is connected to the evaluation device (27) for specifying at least one Working parameters (ai ... a n ) depending on the comparison carried out (28).

10. Method for machining a rail (3) of a single-track railway (4) by means of a system (2) according to one of claims 1 to 9, wherein the nozzle arrangement (12) is brought into a predetermined position relative to the rail (3), characterized in that at least one working parameter (ai ... a n ) to adapt the liquid jet (13) to a predetermined material removal (18) on a surface (19) of the rail (3).

11. Method according to claim 10, characterized in that several nozzles (20) arranged next to one another with differently set working parameters (ai ... a n ) along the rail (3).

12. Method according to claim 10 or 11, characterized in that the rail profile (26) is detected before rail processing with a measuring device (22), that the detected rail profile (26) is compared by means of an evaluation device (27) with a stored target profile (29) and that at least one working parameter (ai ... a n ) is specified depending on the comparison carried out (28).

13. Method according to one of claims 10 to 12, characterized in that after rail processing, the rail profile achieved is recorded by means of a final measuring device (33).

14. Method according to one of claims 10 to 13, characterized in that after a by means of the The surface (19) of the rail (3) is machined by means of a grinding device (24), in particular by oscillating grinding, by means of material removal (18) caused by the liquid jet (13).

15. Method according to one of claims 10 to 14, characterized in that a wear parameter is recorded and evaluated for the respective nozzle (20), in particular by measuring a volume flow and / or a pressure of the working fluid (8) flowing through the respective nozzle (20).

Images