Aluminum wheel hub machining deformation error correction method

Abstract

The present application relates to a kind of aluminum hub processing deformation error correction methods, comprising the following steps: step (1), adjusting the position of positioning tooling;Step (2), hub positioning;Step (3), center compensation: numerical control system controls probe according to the initial center circle center coordinates of step (1), runs to corresponding position, and according to the method of three-point center measurement, the actual coordinates of hub center circle center are measured, defined as center circle center actual coordinates, and compensated into the center circle center coordinates of numerical control system;Step in (4), wheel width error calculation;Step (5), window angle compensation.The present application can effectively solve the problem of uneven milling depth of precision milling surface, at the same time, angle error and center positioning deviation are reduced to within the qualified range.

Description

[0001] This invention relates to the field of wheel hub processing, and in particular to a method for correcting deformation errors in the processing of aluminum wheel hubs. Background Technology

[0002] Aluminum wheels are critical automotive components, and their machining precision directly affects vehicle performance and safety. To meet customized customer needs, some wheels require custom-designed patterns to be milled into the painted surfaces of the spokes and rim after painting. Due to stress release and other factors, spoke deformation is prone to occur. This deformation can lead to unevenness and lateral misalignment on the milled surface during precision milling on a vertical machining center, resulting in inconsistent milling depths and misalignment of the spoke window position. In severe cases, this can render the wheel unusable.

[0003] Currently, the precision milling of aluminum wheel hub surfaces relies on tooling fixation and manual tool setting. If spoke deformation occurs, there's no way to address it; the only recourse is to inspect the finished product for height and planar angle deviations. If deviations are found, the machining program is adjusted locally, requiring repeated machining. In some cases, excessive deviations render the wheel hub unusable. Adjusting the machining program locally demands extensive experience and programming skills from workers, significantly increasing worker requirements and labor costs for the company. Summary of the Invention

[0004] The purpose of this invention is to provide a method for correcting deformation errors in the processing of aluminum wheel hubs, which can effectively solve at least one technical problem existing in the prior art.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for correcting deformation errors in the processing of aluminum wheel hubs, comprising the following steps: Step (1) Adjust the position of the positioning fixture: Set two outer circle fixing blocks and one angle positioning block on the worktable; the position of the angle positioning block can be adjusted in the X-axis and Y-axis and can be disassembled; Based on the CAD drawing of the wheel hub, adjust the position of the angle positioning block so that the outer edge of the wheel hub to be processed on the worktable is connected to the two outer circle fixing blocks, and the angle positioning block is connected to the right inner side of one window of the wheel hub. The angle position of each window of the wheel hub is basically consistent with the angle position of the window of the wheel hub on the CAD drawing. Define the position of the angle positioning block at this time as the set position. The coordinates of the center of the wheel hub's center circle are measured using a dial indicator and defined as the initial center circle coordinates, which are then input into the CNC system. Step (2), hub positioning: Place the hub to be processed on the worktable, adjust the hub to make the outer edge of the hub to be processed connect with the outer circle fixing block; adjust the angle of the hub according to the CAD drawing, and install the angle positioning block in the set position described in step (1), then rotate the hub to make the angle positioning block connect with the right inner side of the hub window, and complete the initial positioning of the hub; then control the machine tool to press the hub, and then remove the angle positioning block; Step (3), Center Compensation: The CNC system controls the probe to run to the corresponding position according to the initial center coordinates of the center circle in step (1), and then measures the actual coordinates of the center circle of the hub according to the three-point center measurement method. This is defined as the actual coordinates of the center circle and compensated into the center circle coordinates of the CNC system. Step (4), Calculation of spoke height error: On the CAD drawing, take a window as the reference window, take a point corresponding to the reference window as the spoke height measurement point, and define it as the spoke reference point. Measure the coordinates of the spoke reference point on the CAD drawing and define them as the initial reference coordinates of the spoke. Input the initial reference coordinates of the spoke into the CNC system. The CNC system calculates the actual coordinates of the spoke reference point based on the initial reference coordinates of the spoke, the hub parameters, and the actual coordinates of the center of the center circle in step (3), and defines them as the actual coordinates of the spoke reference point. The CNC system calculates the actual coordinates of the wheel spoke reference point, the number of wheel hub windows, and the actual coordinates of the center circle to obtain the actual coordinates of the wheel spoke height measurement point corresponding to each window. The CNC system controls the probe to operate based on the actual coordinates of the wheel spoke height measurement points corresponding to each window, measuring the height values ​​of the wheel spoke height measurement points corresponding to each window of the wheel hub. This height value is defined as the actual wheel spoke height value for each window and transmitted to the CNC system. Simultaneously, the CNC system defines the difference between the maximum and minimum actual wheel spoke height values ​​for each window as the height error value. When the height error value exceeds a set threshold, an alarm signal is issued, and operation stops. When the height error value is less than or equal to the set threshold, normal operation continues. Step (5), Window Angle Compensation: On the CAD drawing, take a window as the reference window and obtain the theoretical angle value ∠a between the bisector of the reference window and the Y coordinate axis on the CAD drawing; take a point b on the bisector and define it as the window angle measurement point; first measure the theoretical coordinates of the window angle measurement point on the CAD drawing, input the theoretical coordinates and the theoretical angle value ∠a into the CNC system, and the CNC system calculates the actual coordinates of the window angle measurement point based on the actual coordinates of the center circle in step (3); at the same time, the CNC system can calculate the actual coordinates of the window angle measurement points of the remaining windows based on the number of windows in the hub parameters, the actual coordinates of the center circle obtained in step (3), and the actual coordinates of the window angle measurement point of the reference window. In a CNC system, the upward and downward movement distances of the probe along the Y-axis are set during angle measurement; the sum of the upward and downward movement distances of the probe along the Y-axis is c; the upward and downward movement distances of the probe along the Y-axis during angle measurement are both 1 / 2 of the total distance c. During angle measurement, the CNC system controls the probe to move to the corresponding position based on the actual coordinates of the window angle measurement points of each window. The probe then moves along the Y-axis according to the upward and downward distances, and then controls the probe to move along the X-axis to connect with the two inner sides of the window, obtaining the actual coordinates of f, g, h, and i in the CAD drawing, and calculating the values ​​of j, k, ∠e, and ∠d in the CAD drawing, where j = Xg - Xf, k = Xh - Xi, ∠e = arctan(j / c), and ∠d = arctan(k / c). Finally, the angle deviation value ∆∠a of each window is calculated, ∆∠a = ∠a - [[(∠e + ∠d) / 2] - ∠d]. The CNC system performs window angle error compensation based on the angle deviation value ∆∠a of each window.

[0006] Furthermore, in step (1), when adjusting the position of the angle adjustment block according to the CAD drawing of the wheel hub, select an inner side of a window in the wheel hub as the reference side on the CAD drawing of the wheel hub, and measure the angle of the reference side in the CAD drawing, which is defined as the reference angle; place the wheel hub on the workbench, and after the outer wall of the wheel hub and the two outer circle fixing blocks are connected, rotate the wheel hub, and control the angle of the reference side of the wheel hub and the reference angle to be consistent through the use of a dial indicator. At this time, the angle of the wheel hub on the workbench and the wheel hub window on the CAD drawing are consistent; install the angle positioning block and fix the position of the angle positioning block at this time. This position is the set position of the angle positioning block. When processing the next wheel hub of the same model, you can directly enter step (2).

[0007] Furthermore, in step (4), in the calculation of wheel spoke height error, if there are multiple windows of different models, then for each window of different models, one window needs to be defined as the reference window on the CAD drawing, and according to step (4), the actual coordinates of the wheel spoke reference point of the corresponding model window are obtained, and then the wheel spoke height measurement coordinate system of the same model window is obtained; finally, for windows of different models, the actual wheel spoke height of each window of the same model and the height error value of the same model window are measured; when there is a height error value greater than the set threshold, an alarm signal will be issued and the work will stop.

[0008] Furthermore, in step (5), window angle compensation, for different models of windows, one window needs to be defined as the reference window on the CAD drawing, and the actual coordinates of the window angle measurement point of the corresponding reference window are obtained according to step (5), and finally the angle deviation value ∆∠a of all windows is obtained; the angle deviation value ∆∠a of each window of the same model is a group, and the angle error compensation of each window is completed.

[0009] The beneficial effects of this invention are as follows: This method can calculate the center circle coordinates, spoke height, and window angle error, and can realize real-time dynamic compensation. It can effectively solve the problem of uneven milling depth on the fine milling surface. At the same time, the angle error and center positioning deviation are reduced to within the qualified range, and the compensation accuracy of the height error reaches the micron level, which can fully meet the processing standards of high-end wheel hubs.

[0010] Compared to the traditional method of manually using dial gauges to correct errors, this method can respond to wheel hub deformation in real time. Through a closed-loop mechanism of "measurement-recording-compensation," it can accurately correct dynamic errors, providing a feasible solution for dealing with complex processing environments.

[0011] Compared to the time required for traditional manual dial indicator alignment, this measurement application is seamlessly integrated with the processing steps. The main program directly calls the measurement program through instructions, eliminating the need for manual intervention, reducing auxiliary time, and shortening the processing cycle of a single wheel hub by approximately 20%.

[0012] It supports measurement and compensation of multiple windows, which can meet the processing needs of more than 95% of wheel hubs on the market. By modifying parameters such as the number of windows and the window division angle, it can adapt to the processing needs of wheel hubs of different specifications and has strong flexible production capabilities.

[0013] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the positional structure between the wheel hub and the outer circle fixing block and the angle positioning block when the hub is located on the worktable.

[0015] Figure 2 This is a line drawing of the wheel hub on a CAD drawing.

[0016] Figure 3 This is a schematic diagram showing the auxiliary lines and auxiliary angles within the reference window on the CAD drawing of the wheel hub when compensating for the hub window angle.

[0017] In the diagram, 1 is the hub, 2 is the outer circle fixing block, 3 is the angle positioning block, and 4 is the window. Detailed Implementation

[0018] Examples, such as Figures 1 to 3The method for correcting deformation errors in the machining of an aluminum wheel hub 1, as shown, includes the following steps: Step (1) Adjust the position of the positioning fixture: Set two outer circle fixing blocks 2 and one angle positioning block 3 on the worktable; the position of the angle positioning block 3 can be adjusted in the X-axis and Y-axis and can be disassembled; Based on the CAD drawing of hub 1, adjust the position of angle positioning block 3 so that the outer edge of hub 1 to be processed on the worktable is connected to the two outer circle fixing blocks 2. When angle positioning block 3 is connected to the right inner side of one window 4 of hub 1, the angle position of each window 4 of hub 1 is basically consistent with the angle position of window 4 of hub 1 on the CAD drawing; define the position of angle positioning block 3 at this time as the set position. The center coordinates of the center circle 5 of hub 1 are measured using a dial indicator and defined as the initial center circle coordinates. These coordinates are then input into the CNC system. At the same time, the parameters of hub 1 are also input into the CNC system. The parameters of hub 1 include the spoke height, the number of windows, etc. Step (2), positioning of hub 1: Place the hub 1 to be processed on the worktable, adjust the hub 1 to be processed so that the outer side of the hub 1 is connected to the outer circle fixing block 2; adjust the angle of the hub 1 according to the CAD drawing, and install the angle positioning block 3 in the set position described in step (1), then rotate the hub 1 so that the angle positioning block 3 is connected to the right inner side of the window 4 of the hub 1, and complete the initial positioning of the hub 1; then control the machine tool to press the hub 1, and then remove the angle positioning block 3; Step (3), Center Compensation: The CNC system controls the probe to run to the corresponding position according to the initial center coordinates of the center circle in step (1), and then measures the actual coordinates of the center of the hub 1 according to the three-point center measurement method. This is defined as the actual coordinates of the center circle and compensated into the center circle coordinates of the CNC system. Step (4), Calculation of spoke height error: On the CAD drawing, take window 4 as the reference window, take a point corresponding to the reference window as the spoke height measurement point, and define it as the spoke reference point. Measure the coordinates of the spoke reference point on the CAD drawing and define them as the initial reference coordinates of the spoke. Input the initial reference coordinates of the spoke into the CNC system. The CNC system calculates the actual coordinates of the spoke reference point based on the initial reference coordinates of the spoke, the parameters of hub 1, and the actual coordinates of the center of the center circle in step (3), and defines them as the actual coordinates of the spoke reference point. The actual coordinates of the center of the center circle in step (3) are defined as the origin. The center of the center circle in the CAD drawing is positioned as the origin, so the coordinates of the spoke reference point can be obtained by measuring and calculating on the CAD drawing. The CNC system calculates the actual coordinates of the wheel spoke reference point, the wheel hub 1 parameters (number of windows 4), and the actual coordinates of the center circle to obtain the actual coordinates of the wheel spoke height measurement point corresponding to each window 4. The CNC system controls the probe to operate based on the actual coordinates of the wheel spoke height measurement points corresponding to each window 4, measuring the height values ​​of the wheel spoke height measurement points corresponding to each window 4 of the hub 1. This height value is defined as the actual wheel spoke height value of each window 4 and transmitted to the CNC system. Simultaneously, the CNC system defines the difference between the maximum and minimum actual wheel spoke height values ​​of each window 4 as the height error value. When the height error value exceeds a set threshold, an alarm signal is issued, and operation stops. When the height error value is less than or equal to the set threshold, normal operation continues. Step (5), Window 4 Angle Compensation: On the CAD drawing, take a window 4 as the reference window and calculate the theoretical angle value ∠a between the bisector of the reference window and the Y coordinate axis on the CAD drawing; take a point b on the bisector and define it as the window angle measurement point; first, measure the theoretical coordinates of the window angle measurement point b on the CAD drawing, input the theoretical coordinates and the theoretical angle value ∠a into the CNC system, and the CNC system calculates the actual coordinates of the window angle measurement point based on the actual coordinates of the center circle in step (3); at the same time, the CNC system can calculate the actual coordinates of the window angle measurement points of the other windows 4 based on the actual coordinates of the window angle measurement points, the parameters of hub 1 (number of windows 4) and the actual coordinates of the center circle in step (3); at the same time, the actual coordinates of the center circle in step (3) are defined as the origin, and the center circle in the CAD drawing is positioned as the origin, so the actual coordinates of the window angle measurement points can be obtained by measuring and calculating on the CAD drawing; In a CNC system, the upward and downward movement distances of the probe along the Y-axis are set during angle measurement; the sum of the upward and downward movement distances of the probe along the Y-axis is c; the upward and downward movement distances of the probe along the Y-axis during angle measurement are both 1 / 2 of the total distance c. During angle measurement, the CNC system controls the probe to move to the corresponding position based on the actual coordinates of the angle measurement points of each window 4. The probe then moves along the Y-axis according to the upward and downward distances, and then controls the probe to move along the X-axis to connect with the two inner sides of the corresponding window 4, thus obtaining the actual coordinates of f, g, h, and i in the CAD drawing. The values ​​of j, k, ∠e, and ∠d in the CAD drawing are calculated, where j = Xg - Xf, k = Xh - Xi, ∠e = arctan(j / c), and ∠d = arctan(k / c). Finally, the angle deviation value ∆∠a of each window 4 is calculated, ∆∠a = ∠a - [[(∠e + ∠d) / 2] - ∠d]. The CNC system compensates for the angle error of window 4 based on the angle deviation value ∆∠a of each window 4. In the CAD drawing, taking window 4 as an example, or the base window as an example, draw the auxiliary angles and auxiliary corners. The apex angle of the window is taken as the apex angle of the circle 5 closest to the center of hub 1. On the CAD drawing, draw the Y-axis and angle bisector of the window angle, with the angle between the Y-axis and the angle bisector being ∠a. Take a point on the angle bisector as the window angle measurement point, defined as b. When the probe measures the window angle, the probe moves up and down along the Y-axis from point b by equal distances, and their sum is defined as c. In the CAD drawing, draw four points where the probe connects to the left and right inner sides of the reference window after moving up and down by the X-axis, namely h, f, i, and g. Draw a Y-axis coordinate line downwards with h and f as vertices, with a length equal to c, and draw the line connecting g and i. This will give two right triangles with h and f as vertices, with bases k and j respectively. The vertex angles of the two triangles are d and e respectively.

[0019] The sum of the theoretical angle value of each window 4 in the parameters of hub 1 and the corresponding angle deviation value ∆∠a (positive and negative deviation) of window 4 is the actual angle value of each window 4 in hub 1. The milling cutter corrects the milling path based on the parameters of hub 1, the corrected coordinates of the center circle of hub 1, the spoke height values ​​of each window 4, and the actual angle values ​​of each window 4, and then performs the milling process.

[0020] In step (1), when adjusting the position of the angle adjustment block according to the CAD drawing of hub 1, select an inner side of a window 4 in hub 1 as the reference side on the CAD drawing of hub 1, and measure the angle of the reference side in the CAD drawing, which is defined as the reference angle. After hub 1 is placed on the workbench and the outer wall of hub 1 is connected to the two outer circle fixing blocks 2, rotate hub 1 and control the angle of the reference side of hub 1 and the reference angle to be consistent with the reference angle through the dial indicator. At this time, the angle of hub 1 on the workbench and the angle of window 4 of hub 1 on the CAD drawing are consistent. Install the angle positioning block 3 and fix the position of the angle positioning block 3 at this time. This position is the set position of the angle positioning block 3. When processing hub 1 of the same model, you can directly enter step (2).

[0021] In step (4), when calculating the spoke height error, if there are multiple windows 4 of different models, then for each window 4 of different models, one window 4 needs to be selected on the CAD drawing as the reference window, and according to step (4), the actual coordinates of the spoke reference point of the corresponding model window 4 are obtained, and then the spoke height measurement coordinate system of the same model window 4 is obtained; finally, for each window 4 of different models, the actual spoke height of each window 4 of the same model is measured, and the height error value of the same model window 4 is obtained; when there is a height error value greater than the set threshold, an alarm signal will be issued and the work will stop.

[0022] In step (5), during the window 4 angle compensation, for different models of window 4, one window 4 needs to be defined as the reference window on the CAD drawing, and the actual coordinates of the window angle measurement point of the corresponding reference window 4 are obtained according to step (5), and finally the angle deviation value ∆∠a of all windows 4 is obtained; the angle deviation value ∆∠a of each window 4 of the same model is a group, and the angle error compensation of each window 4 is completed.

[0023] In the description of this invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0026] The above embodiments are not intended to limit the scope of the invention, but rather to illustrate it. The scope of the invention is determined by the scope of the claims, not by the description itself, and should be interpreted as including all differences within the equivalent scope. Any non-substantial improvements made using the inventive concept and technical solutions, or the direct application of the above-described concepts and technical solutions of the invention to other situations without modification, are all within the protection scope of the invention.

Claims

1. A method for correcting deformation errors during the processing of aluminum wheel hubs, characterized in that: Includes the following steps: Step (1) Adjust the position of the positioning fixture: Set two outer circle fixing blocks and one angle positioning block on the worktable; the position of the angle positioning block can be adjusted in the X-axis and Y-axis and can be disassembled; Based on the CAD drawing of the wheel hub, adjust the position of the angle positioning block so that the outer edge of the wheel hub to be processed on the worktable is connected to the two outer circle fixing blocks, and the angle positioning block is connected to the right inner side of one window of the wheel hub. The angle position of each window of the wheel hub is basically consistent with the angle position of the window of the wheel hub on the CAD drawing. Define the position of the angle positioning block at this time as the set position. The coordinates of the center of the wheel hub's center circle are measured using a dial indicator and defined as the initial center circle coordinates, which are then input into the CNC system. Step (2), hub positioning: Place the hub to be processed on the worktable, adjust the hub to make the outer edge of the hub to be processed connect with the outer circle fixing block; adjust the angle of the hub according to the CAD drawing, and install the angle positioning block in the set position described in step (1), then rotate the hub to make the angle positioning block connect with the right inner side of the hub window, and complete the initial positioning of the hub; then press the hub tight, and then remove the angle positioning block; Step (3), Center Compensation: The CNC system controls the probe to run to the corresponding position according to the initial center coordinates of the center circle in step (1), and then measures the actual coordinates of the center circle of the hub according to the three-point center measurement method. This is defined as the actual coordinates of the center circle and compensated into the center circle coordinates of the CNC system. Step (4), Calculation of spoke height error: On the CAD drawing, take a window and define it as the reference window. Take a point corresponding to the reference window as the spoke height measurement point and define it as the spoke reference point. Measure the coordinates of the spoke reference point on the CAD drawing and define them as the initial reference coordinates of the spoke. Input the initial reference coordinates of the spoke into the CNC system. The CNC system calculates the actual coordinates of the spoke reference point based on the initial reference coordinates of the spoke, the hub parameters, and the actual coordinates of the center of the center circle in step (3), and defines them as the actual coordinates of the spoke reference point. The CNC system calculates the actual coordinates of the wheel spoke height measurement points corresponding to each window based on the actual coordinates of the wheel spoke reference points, the wheel hub parameters, and the actual coordinates of the center of the center circle in step (3). The CNC system controls the probe to operate based on the actual coordinates of the wheel spoke height measurement points corresponding to each window, measuring the height values ​​of the wheel spoke height measurement points corresponding to each window of the wheel hub. This height value is defined as the actual wheel spoke height value for each window and is then incorporated into the wheel spoke height values ​​of each window in the CNC system. Simultaneously, the CNC system defines the difference between the maximum and minimum actual wheel spoke height values ​​from all windows as the height error value. When the height error value exceeds a set threshold, an alarm signal is issued, and operation stops. When the height error value is less than or equal to the set threshold, normal operation continues. Step (5), Window Angle Compensation: On the CAD drawing, take a window as the reference window and obtain the theoretical angle value ∠a between the bisector of the reference window and the Y coordinate axis on the CAD drawing; take a point b on the bisector and define it as the window angle measurement point; first, measure the theoretical coordinates of the window angle measurement point on the CAD drawing, input the theoretical coordinates and the theoretical angle value ∠a into the CNC system, and the CNC system calculates the actual coordinates of the window angle measurement point based on the actual coordinates of the center circle in step (3); at the same time, the CNC system can calculate the actual coordinates of the window angle measurement points of the other windows based on the actual coordinates of the window angle measurement points, the hub parameters and the actual coordinates of the center circle in step (3); In a CNC system, the upward and downward movement distances of the probe along the Y-axis are set during angle measurement; the sum of the upward and downward movement distances of the probe along the Y-axis is c; the upward and downward movement distances of the probe along the Y-axis during angle measurement are both 1 / 2 of the total distance c. During angle measurement, the CNC system controls the probe to move to the corresponding position based on the actual coordinates of the window angle measurement points of each window. The probe then moves along the Y-axis according to the upward and downward distances, and then controls the probe to move along the X-axis to connect with the two inner sides of the window, obtaining the actual coordinates of f, g, h, and i in the CAD drawing, and calculating the values ​​of j, k, ∠e, and ∠d in the CAD drawing, where j = Xg - Xf, k = Xh - Xi, ∠e = arctan(j / c), and ∠d = arctan(k / c). Finally, the angle deviation value ∆∠a of each window is calculated, ∆∠a = ∠a - [[(∠e + ∠d) / 2] - ∠d]. The CNC system performs window angle error compensation based on the angle deviation value ∆∠a of each window.

2. The method for correcting deformation errors in aluminum wheel hub processing according to claim 1, characterized in that: In step (1), when adjusting the position of the angle adjustment block according to the CAD drawing of the wheel hub, select an inner side of a window in the wheel hub as the reference side on the CAD drawing of the wheel hub, and measure the angle of the reference side in the CAD drawing, which is defined as the reference angle; place the wheel hub on the workbench, and after the outer wall of the wheel hub and the two outer circle fixing blocks are connected, rotate the wheel hub, and control the angle of the reference side of the wheel hub and the reference angle to be consistent through the use of a dial indicator. At this time, the angle of the wheel hub on the workbench and the wheel hub window on the CAD drawing are consistent; install the angle positioning block and fix the position of the angle positioning block at this time. This position is the set position of the angle positioning block. When processing the next wheel hub of the same model, you can directly enter step (2).

3. The method for correcting deformation errors in aluminum wheel hub processing according to claim 1, characterized in that: In step (4), in the calculation of wheel spoke height error, if there are multiple windows of different models, then for each window of different models, one window needs to be selected on the CAD drawing as the reference window, and according to step (4), the actual coordinates of the wheel spoke reference point of the corresponding model window are obtained, and then the wheel spoke height measurement coordinate system of the same model window is obtained; finally, for windows of different models, the actual wheel spoke height of each window of the same model and the height error value of the same model window are measured; when a height error value is greater than the set threshold, an alarm signal will be issued and the work will stop.

4. The method for correcting deformation errors in aluminum wheel hub processing according to claim 3, characterized in that: In step (5), during window angle compensation, for different models of windows, one window needs to be defined as the reference window on the CAD drawing, and the actual coordinates of the window angle measurement point of the corresponding reference window are obtained according to step (5), and the angle deviation value ∆∠a of all windows is finally obtained; the angle deviation value ∆∠a of each window of the same model is a group, and the angle error compensation of each window is completed.

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