Graphite carbon sliding strip milling and grinding method based on aluminum supporting plate curve

Abstract

The invention discloses a graphite carbon sliding strip milling and grinding method based on an aluminum supporting plate curve, and relates to the technical field of visual inspection. Comprising the following steps of at least obtaining thickness values of three point positions of a certain section of the carbon contact strip, obtaining a parabolic function of the carbon contact strip according to measured data, obtaining a minimum thickness value of the carbon contact strip, and milling and grinding a part exceeding the thickness value by using a machine tool on the basis of the parabolic function and the minimum thickness value. According to the method, the surface parameters of the carbon sliding plate are obtained through scanning modeling, then effective milling and grinding are conducted, and it is guaranteed that the milled and ground carbon sliding plate completely conforms to the use scene to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of visual inspection, and in particular to a milling method for graphite carbon slide bars based on the curve of an aluminum pallet. Background Art

[0002] In a rail transit system, a carbon slide plate is an important consumable. During the maintenance of the carbon slide plate, its available thickness is often measured, and some states on its surface are monitored as daily inspection standards. In actual use, as a friction component, the contact state of the carbon slide plate is vertically crossed, but the movement mode is reciprocating operation. Once there are protrusions on the surface of the carbon slide plate, as Figure 3 shown, it will form a pulling action on the contact wire, and thus it is easy to cause damage to the contact wire, such as severe damage like diagonal cutting and curling.

[0003] At this time, either replacement or grinding treatment is required. Since the contour of the carbon slide plate follows a specific function, manual grinding cannot restore the original curve function of the carbon slide plate. Therefore, professional equipment is needed to perform grinding treatment on it. Summary of the Invention

[0004] Object of the Invention: Based on the problems mentioned in the background art, a milling method for graphite carbon slide bars based on the curve of an aluminum pallet is proposed.

[0005] Technical Solution: A milling method for graphite carbon slide bars based on the curve of an aluminum pallet, characterized by including the following steps:

[0006] Step S1: Obtain at least the thickness values of three points on a certain cross-section of the carbon slide plate;

[0007] Step S2: Obtain the parabolic function of the carbon slide plate according to the measured data;

[0008] Step S3: Obtain the minimum thickness value of the carbon slide plate, and based on this, use a machine tool to mill the part that exceeds this thickness value.

[0009] In a further embodiment, the further content of step S1 is:

[0010] Step S11: Horizontally fix the carbon slide plate, and in the direction of the X-axis, use a laser displacement sensor to obtain a curve in one X direction;

[0011] Step S12: Based on the curve in step S11, divide it by 0.1 mm to obtain an infinite number of height arrays that feedback the surface thickness of the carbon slide plate;

[0012] Step S13: Take the height d0 of the first point in the array;

[0013] Step S14: Take the height d1 of the middle point in the array;

[0014] Step S15: Obtain the height d2 of the last point in the array.

[0015] In a further embodiment, the further content of step S11 is as follows:

[0016] Step S111: Obtain the highest point in step S11;

[0017] Step S112: Take this highest point as a passing point, and a straight line on the Z-axis on the surface of the carbon skateboard, and the Z-axis straight line is perpendicular to the X-axis;

[0018] Step S113: Obtain the lowest point on the Z-axis straight line;

[0019] Step S114: Take the lowest point obtained in step S113 and obtain the X-direction curve passing through the surface of the carbon skateboard.

[0020] In a further embodiment, the further content of step S2 is as follows:

[0021] Step S21: Construct a parabolic function on the surface of the carbon skateboard:

[0022] y = ax 2 + bx + c

[0023] where y reflects the thickness of the carbon skateboard, x reflects the X-direction value of the carbon skateboard, and a, b, and c are constants;

[0024] Step S22: Based on step 1, obtain the parameters of a, b, and c.

[0025] In a further embodiment, the further content of step S3 is as follows:

[0026] Step S31: Call the parabolic function obtained in step S22, input the minimum milling thickness value, and correct the constant c;

[0027] Step S32: Output the corrected parabolic function and use the machine tool for milling.

[0028] Beneficial effects:

[0029] 1. Compared with the traditional direct grinding, the basic programmable machine tool of the present application constructs a parabolic equation reflecting the current state of the carbon skateboard through the scheme of obtaining the lowest point, and then performs processing, which can eliminate the boss to the greatest extent. Description of the Drawings

[0030] Figure 1 It is a schematic system flow diagram of the present invention.

[0031] Figure 2 It is a schematic diagram of the skateboard measurement position of the present invention.

[0032] Figure 3 It is a schematic diagram of the curve of the milling and grinding travel of the present invention. Specific Embodiment

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] Based on the solution mentioned in the background art, the present application is a technical method for effectively processing the convex platform on the surface of the carbon slide plate, and its content includes:

[0036] At least obtain the thickness values of three points on a certain cross-section of the carbon slide plate:

[0037] Step S2: According to the measured data, obtain the parabolic function of the carbon slide plate;

[0038] Step S3: Obtain the minimum thickness value of the carbon slide plate, and based on this, use the machine tool to mill and grind the part that exceeds this thickness value.

[0039] In a further embodiment, the further content of step S1 is: specifically, it includes horizontally fixing the carbon slide plate with a machine tool, taking the X-axis as the direction, using a laser displacement sensor to obtain a curve in one X direction. In order to accurately measure this curve, obtain the highest point of the curve, and based on the highest point, obtain a straight line segment, which is the set of the highest points of the carbon slide plate, that is, the Z-axis straight line on the surface of the carbon slide plate, and the Z-axis straight line is perpendicular to the X-axis. Obtain the lowest point on the Z-axis straight line, and based on this lowest point, obtain the X-direction curve passing through the surface of the carbon slide plate, and this curve reflects the curvature of the carbon slide plate in the X direction.

[0040] Divide it by 0.1 mm to obtain an infinite number of height arrays that reflect the surface thickness of the carbon slide plate. Take the height d0 of the first point in the array, take the height d1 of the middle point in the array, take the height d2 of the last point in the array, and construct the corresponding x value, where the x value reflects the displacement along the x direction of the carbon slide plate.

[0041] Construct the parabolic function of the carbon slide plate surface:

[0042] y = ax 2 + bx + c

[0043] Among them, y reflects the thickness of the carbon slide plate, x reflects the X-direction value of the carbon slide plate, and a, b, and c are constants. Based on the above measured values, obtain the parameters of a, b, and c.

[0044] Input the obtained parabolic function and the minimum milling thickness value, correct the constant c, output the corrected parabolic function, and use the machine tool for milling and grinding.

[0045] In order to better elaborate this solution, this embodiment will be elaborated in detail in combination with the machine tool, asFigure 1 and Figure 2 As shown in Figure 2 , the specific content is as follows: First, measure the thickness values of three fixed positions within the machining range of the carbon slide plate fixed in the machining tool. The thickness of the first point of the carbon slide plate on the X-axis within the machining range of the tool is H0, the thickness of the center point of the carbon slide plate on the X-axis within the machining range of the tool is H1, and the thickness of the last point of the carbon slide plate on the X-axis within the machining range of the tool is H2.

[0046] Next, the machine tool measures the surface of the carbon slide plate with the horizontal X-axis as the traveling direction. There is a laser displacement sensor inside the milling machine. In the form of a uniform linear motion in the horizontal X-axis direction, the height value between the carbon slide plate and the displacement sensor is measured. At the same time, the straight line X from the starting point is recorded. During the measurement process, an array (Xx, Dx) is recorded every 0.1 mm and a file DX.bin is formed. The height of the first point in the array is d0, the height of the middle point in the array is d1, and the height of the last point in the array is d2.

[0047] Then, calculate the parabolic parameters of the carbon slide plate based on the measured data. According to the obtained data groups (H0, d0), (H1, d1), (H2, d2), the parabolic function is as follows, y = ax 2 + bx + c, and the three constants a, b, c are calculated and stored in the temporary file temp.bin. Among them, y reflects the thickness of the carbon slide plate, and x reflects the X-direction value of the carbon slide plate.

[0048] Finally, input the minimum thickness value of the carbon slide plate. According to the traveling speed Dx of the X-axis lead screw, the displacement Dy of the Y-axis is precisely controlled to achieve the purpose of curve milling along the aluminum support. According to the input minimum milling thickness value, the obtained parabolic function is called. The Y-axis where the milling is located controls the Dy displacement according to the traveling speed Dx of the X-axis to ensure that the milled arc surface is consistent with the aluminum support plate. Only the carbon layer is milled. Therefore, it is necessary to accurately calculate the absolute thickness value between the displacement and the aluminum support plate.

[0049] (Step S1: Measure the thickness data of three fixed points of the carbon slide plate to be milled, such as Figure 2 , and the parameter measurement values are: d0, d1, d2.

[0050] Step S2: Calculate the three constants a, b, c in the temp.bin file according to the data measured in S1 based on y = ax 2 + bx + c.

[0051] Step S3: According to the minimum value d of the carbon layer thickness within the effective use length L.

[0052] Step S4: Substitute the d value into the parabolic function as follows:

[0053] Dy = a(Dx) 2+bDx+c+d

[0054] The function calculated previously is the curve function of the aluminum pallet, so the lowest point thickness data is added to control the Dy feed amount in the vertical direction to meet the requirements of arc milling.)

[0055] Example 2

[0056] Example 1 is implemented based on a conventional machine tool, which has conventional precision requirements for the machine tool and belongs to rough grinding. In a further modeling scheme, the present application provides a second more accurate technical solution to meet the high-precision requirements of carbon skateboard milling.

[0057] A five-axis linkage scanning robot arm is equipped with a dual-frequency laser displacement sensor with a wavelength of 532nm / 1064nm to achieve three-dimensional contour scanning with a resolution of 0.005mm. An integrated infrared thermal imager with a 3-5μm band is used to synchronously acquire surface temperature field data and establish a thermal deformation compensation model.

[0058] The adaptive scanning path planning algorithm was further developed to dynamically adjust the measurement density based on the initial scanning data, and automatically encrypt the density to 0.01mm intervals in areas with large curvature changes.

[0059] A convolutional neural network is introduced to detect outliers in the scan data and automatically remove interference data caused by surface contaminants. The wear feature is extracted hierarchically based on the improved RANSAC algorithm to identify the main wear area, transition area and unworn area.

[0060] Wavelet transform is used to perform multi-scale feature decomposition to separate mechanical wear and material elastic deformation components.

[0061] The equation of the hyperbolic parabola is established, the curvature parameter of the lateral Z axis is introduced, and a hybrid genetic-particle swarm optimization algorithm is developed. The fitting accuracy and processing feasibility constraints are optimized simultaneously, the material constitutive model is integrated, and the mechanical rationality of the theoretical model is verified through finite element simulation.

[0062] A wear evolution model based on LSTM neural network is constructed, and the input includes historical wear data, operating load spectrum and environmental parameters.

[0063] Integrate acoustic emission sensors and cutting force monitoring systems to establish a processing status feature fingerprint library.

[0064] An active vibration suppression control system based on fuzzy PID is developed to compensate for the dynamic vibration error during the machining process.

[0065] Realize μ-level precision online laser thickness measurement, forming a closed-loop control circuit of "measurement-processing-calibration".

[0066] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A graphite carbon slide milling method based on an aluminum support plate curve, characterized in that: The following steps are involved: Step S1, obtaining thickness values ​​of at least three points of a certain cross section of the carbon slide plate; Step S2, obtaining a parabolic function of the carbon slide board according to the measured data; Step S3, obtaining the minimum thickness value of the carbon slide plate, and based on this, using a machine tool to mill the portion exceeding the thickness value.

2. The method for milling a graphite carbon slide based on an aluminum support plate curve according to claim 1, characterized in that: The further contents of step S1 are: Step S11, fix the carbon slide plate horizontally, take the X-axis as the direction, use the laser displacement sensor to obtain one of the X-direction curves; Step S12, based on the curve of step S11, segment it by 0.1 mm to obtain a height array of the carbon slide surface thickness that has no array feedback; Step S13, taking the height d0 of the first point in the array; Step S14, taking the height d1 of the middle point in the array; Step S15, get the height d2 of the last point in the array.

3. The method for milling a graphite carbon slide based on an aluminum support plate curve according to claim 2, characterized in that: The further contents of step S11 are: Step S111, obtaining the highest point in step S11; Step S112, taking the highest point as a waypoint, a Z-axis straight line located on the surface of the carbon slide plate, the Z-axis straight line being perpendicular to the X-axis; Step S113, obtaining the lowest point on the Z-axis straight line; Step S114, obtaining the lowest point in step S113, and obtaining an X-direction curve passing through the surface of the carbon slide plate.

4. The method for milling a graphite carbon slide based on an aluminum support plate curve according to claim 3 is characterized in that: The further contents of step S2 are: Step S21, constructing a parabolic function of the carbon skateboard surface: y=ax 2 +bx+c Among them, y reflects the thickness of the carbon slide, x reflects the X-direction value of the carbon slide, and a, b, and c are constants; Step S22: Based on step 1, obtain the parameters of a, b, and c.

5. The method for milling a graphite carbon slide based on an aluminum support plate curve according to claim 4 is characterized in that: The further contents of step S3 are: Step S31, calling the parabolic function obtained in step S22, inputting the minimum milling thickness value, and correcting the constant c; Step S32: output the corrected parabolic function and use a machine tool for milling.

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