Train wheel waviness testing method

Abstract

The invention discloses a method for testing the waviness of a train wheel. The method comprises the following steps: manufacturing a wheel sample; due to the design of the fixing device, the fixing device is used for fixing the wheel sample; fixing the sample; testing: operating a ripple instrument to start ripple testing; the Wa value and the Wamax-Wami n value are selected to carry out waviness characterization; (1) the average value of Wa waviness is used for describing the average height of train surface waviness; (2) Wamax-Wami n represents the maximum value and the minimum value of the waviness respectively, and the difference between Wamax and Wami n reflects the maximum fluctuation and the minimum fluctuation of the waviness on the surface profile. The invention aims to provide a method for testing the waviness of a train wheel so as to realize the detection of the waviness of the train wheel.

Description

Technical Field

[0001] The invention relates to a method for testing the waviness of train wheels. Background Art

[0002] The waviness of train wheels refers to the phenomenon that the wheel surface is periodically undulating and uneven, which may be caused by a variety of factors, such as wheel wear, material unevenness, manufacturing process, etc. The waviness of train wheels is one of the important indicators for evaluating the surface quality of wheels, and it has a significant impact on the running stability, noise level and safety of trains.

[0003] Impact of corrugation on riding smoothness: The corrugation of the wheel will increase the vibration of the train during driving, affect the riding comfort, and may cause damage to the internal equipment of the train; Noise level: Wheels with larger corrugations will produce greater noise when driving, causing noise pollution to the surrounding environment; Safety: Severe corrugation may lead to poor contact between the wheel and the rail, affecting the braking and traction performance of the train, and may even cause safety accidents.

[0004] At present, the research on wheel waviness is still in the exploratory stage, and there is no mature conclusion or corresponding standard. Generally speaking, the waviness of the wheel should be controlled within a certain range to ensure the normal operation and safety of the train, but there are no regulations on the measurement methods and indicators. At present, there is no specific standard for the detection of train wheels. It is necessary to design a reasonable experimental procedure based on the wheel-rail combination method and the material properties of the wheel and rail. Summary of the invention

[0005] The purpose of the present invention is to provide a method for testing the waviness of train wheels, so as to realize the detection of the waviness of train wheels.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for testing the waviness of a train wheel according to the present invention comprises the following steps:

[0008] 1) Preparation of wheel samples

[0009] First, the sample is designed and processed. Since the overall size of the train wheel is large, sampling is required: wire cutting is used to sample the train wheel, and the size is cut according to different wheel models;

[0010] 2) Design of the fixing device

[0011] The function of the fixing device is to fix the wheel specimen: two devices are designed to fix the two sides of the specimen respectively;

[0012] 3) Fix the sample

[0013] Fix the sample on the table of the corrugation instrument;

[0014] 4) Testing

[0015] Operate the corrugation meter to start the corrugation test;

[0016] Wa and Wamax-Wamin values ​​are used to characterize the waviness;

[0017] (1) Average value of Wa waviness: used to describe the average height of the waviness of the train surface.

[0018] (2) Wamax-Wamin: They represent the maximum and minimum values ​​of the waviness respectively. Wamax minus Wamin reflects the maximum and minimum fluctuations of the waviness on the surface profile.

[0019] Furthermore, the height D of the wheel is selected to be 30 mm.

[0020] Furthermore, in step 1), 5 sets of data are obtained, the sampling length is 120 mm, and each set is 20 mm.

[0021] Furthermore, the test parameters are set as shown in the following table:

[0022]

[0023]

[0024] Further, the fixing device includes a fixing device 1 and a fixing device 2, wherein:

[0025] Drill two holes of 30×10 mm in length on the bottom surface of the fixture 1, and drill bolt holes of Ø8 mm on the table of the corrugation profiler to fix the fixture 1;

[0026] The fixture 2 is used to fix the sample. A hole with a length of 15 mm and a width of 10 mm is drilled on the bottom surface of the fixture 2. At the same time, two 8 mm bolt holes are drilled on the sawing table, each of which is 100 mm away from the saw blade. The fixture 2 is fixed to the table with bolts, and the distance can be adjusted to a certain extent.

[0027] Compared with the prior art, the beneficial technical effects of the present invention are:

[0028] The method of the present invention can be used for detecting train wheels to detect whether the wheel corrugation is controlled within a required reasonable range, so as to ensure the normal operation and safety of the train. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of sampling of train wheels;

[0031] Figure 2 Schematic diagram of the waviness specimen size;

[0032] Figure 3 is a schematic diagram of a sample fixing device 1;

[0033] Figure 4 is a schematic diagram of a sample fixing device 2;

[0034] Figure 5 Schematic diagram of sample clamping;

[0035] Figure 6 Schematic diagram of the corrugation test of the sample. DETAILED DESCRIPTION

[0036] In order to detect the waviness of train wheels, the rectangular coordinate measurement method is adopted. First, the wheel sample is made and the fixing device is designed. A dual-axis corrugation profiler is used, that is, the coordinate points of the surface contour of the wheel are measured through X-axis and Y-axis sensors. The coordinate point data measured by the sensor is transmitted to the computer through electrical components, and the collected original coordinate data is mathematically processed to mark the required waviness of the train wheel.

[0037] A method for testing the waviness of a train wheel, comprising:

[0038] 1. Preparation of wheel specimens

[0039] First, the sample is designed and processed. Since the overall size of the train wheel is relatively large, about 1m, sampling is required: wire cutting is used to sample the train wheel, and the size is cut according to different wheel models. For example, the height of D selected for the CL60 wheel is 30mm, see Figure 1 .

[0040] To obtain 5 sets of data, the sampling length is 120mm, and each 20mm is a set. For specific dimensions, see Figure 2 .

[0041] 2. Design of the fixing device

[0042] The function of the fixing device is to fix the wheel specimen: two devices are designed to fix the two sides of the specimen respectively.

[0043] The specific dimensions of the fixture 1 are shown in Figure 3 Drill two holes of 30×10mm in length on the bottom surface of the device, and drill Ø8mm bolt holes on the corrugation profiler table to fix the device.

[0044] Fixing device 2 is used to fix the specimen. Drill a hole with a length of 15mm and a width of 10mm on the bottom surface of the mechanism. At the same time, drill two 8mm bolt holes on the sawing table, with a distance of 100mm from the saw blade. Use Ф8 bolts to fix the fixing device 2 on the table, and the distance can be adjusted to a certain extent, such as Figure 4 shown.

[0045] Specific testing process:

[0046] 1. First, fix the sample on the table of the corrugation instrument, such as Figure 5 As shown;

[0047] 2. Set the equipment parameters and conduct the corrugation test, measuring a set of data every 20 mm. See Table 1 for specific parameters.

[0048] Table 1 Equipment parameters

[0049]

[0050]

[0051] 3. Testing

[0052] Operate the corrugation tester to start the corrugation test. See the schematic diagram of the corrugation test of the sample. Figure 6 .

[0053] Waviness test system Figure 6 As shown. The system mainly includes: host table, computer, fixture, sample, probe and rod, motion device. First, hold the sample, start the machine, put the probe in the initial position, run the X-axis from left to right, and perform the waviness test on the Z-axis. At the same time, the computer displays the current operation prompts, the coordinates of the cursor in the graphic display area and other information.

[0054] 4. Data processing

[0055] Wa and Wamax-Wamin values ​​are used to characterize the waviness:

[0056] (1) Average value of Wa waviness: used to describe the average height of the waviness of the train surface.

[0057] (2) Wamax-Wamin: They represent the maximum and minimum values ​​of the waviness respectively. Wamax minus Wamin reflects the maximum and minimum fluctuations of the waviness on the surface profile.

[0058] Example 1

[0059] Select CL60 wheel to carry out waviness test, obtain 5 sets of data in total, take the arithmetic mean of waviness, and after parts measurement, marking and parameter evaluation are completed, the test results can be printed out, as shown in the following table.

[0060]

[0061] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for testing the waviness of a train wheel, characterized in that: The steps include: 1) Preparation of wheel samples First, the sample is designed and processed. Since the overall size of the train wheel is large, sampling is required: wire cutting is used to sample the train wheel, and the size is cut according to different wheel models; 2) Design of the fixing device The function of the fixing device is to fix the wheel specimen: two devices are designed to fix the two sides of the specimen respectively; 3) Fix the sample Fix the sample on the table of the corrugation instrument; 4) Testing Operate the corrugation meter to start the corrugation test; Wa and Wamax-Wamin values ​​are used to characterize the waviness; (1) Average waviness value Wa: used to describe the average height of the waviness of the train surface; (2) Wamax-Wamin: They represent the maximum and minimum values ​​of the waviness respectively. Wamax minus Wamin reflects the maximum and minimum fluctuations of the waviness on the surface profile.

2. The method for testing the waviness of a train wheel according to claim 1, characterized in that: The height of the wheel D is 30mm.

3. The method for testing the waviness of a train wheel according to claim 1, characterized in that: In step 1), 5 sets of data are obtained, the sampling length is 120 mm, and each set is 20 mm.

4. The method for testing the waviness of a train wheel according to claim 1, characterized in that: The test parameter settings are shown in the following table:

5. The method for testing the waviness of a train wheel according to claim 1, characterized in that: The fixing device comprises a fixing device 1 and a fixing device 2, wherein: Drill two holes of 30×10 mm in length on the bottom surface of the fixture 1, and drill bolt holes of Ø8 mm on the table of the corrugation profiler to fix the fixture 1; Fixture 2 is used to fix the sample. A hole with a length of 15 mm and a width of 10 mm is drilled on the bottom surface of fixture 2. At the same time, two 8 mm bolt holes are drilled on the table top, each of which is 100 mm away from the saw blade. Fixture 2 is fixed on the table top with bolts, and the distance can be adjusted to a certain extent.

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