Device and method for obtaining optimal wheel mounting point and optimal mounting method
Through the devices and methods of laser ranging sensors and linear modules, the optimal axial and radial mounting points of aluminum wheels are found, which solves the deviation problems caused by deformation during the machine-adding process, and improves the yield and processing quality.
Patent Information
- Application Number
- CN202010467927.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-05-28
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2040-05-28
AI Technical Summary
During the process of adding aluminum wheels, due to deformation of the axial and radial positioning surfaces, resulting in angular and position deviations, resulting in problems such as deviation of the truck, inability to process and large amounts of balanced waste, which affects the yield rate and processing quality.
Using devices and methods including the first and second laser ranging sensors and linear modules, the measurement data is fitted through the least squares method to find the axial and radial optimal mounting points of the wheel to ensure accurate positioning and mounting and reduce Card installation error.
It minimizes the loading error, improves the yield and processing quality of the wheels, and reduces the occurrence of off-car and balanced waste.
Smart Images
Figure CN111673543B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of clamping in automobile machining, and in particular to a device and method for acquiring an optimal clamping point of a wheel, and an optimal clamping method. Background Art
[0002] The machined blank of the aluminum wheel is obtained through smelting, casting, heat treatment and other processes. The actual machined blank has different degrees of end face deformation on the axial positioning surface and different degrees of radial deformation on the radial positioning surface. If the conventional random positioning and clamping method is used, it is easy to cause angle deviation due to end face deformation and position deviation due to radial deformation, resulting in problems such as eccentricity, insufficient processing, and many balanced scraps during the machining process, affecting the aluminum wheel yield and processing quality. Summary of the invention
[0003] The embodiments of the present application provide a device and method for obtaining the optimal mounting point of a wheel and an optimal mounting method, which can solve the problems in the background technology.
[0004] To achieve the above object, the present invention provides the following technical solutions:
[0005] In a first aspect, the present invention provides a device for acquiring an optimal loading point of a wheel, comprising a first laser ranging sensor, a first linear module, a second laser ranging sensor, and a second linear module, wherein the first linear module and the second linear module are vertically fixed, the first laser ranging sensor is fixed on a sliding seat of the first linear module, and the second laser ranging sensor is fixed on a sliding seat of the second linear module; the first laser ranging sensor is used to measure the distance of the middle position of the outer wheel rim in the vertical direction of the wheel; the second laser ranging sensor is used to measure the distance of the middle position of the outer wheel rim in the horizontal direction of the wheel.
[0006] In some embodiments, the device for obtaining the optimal loading point of a wheel also includes a tapered sleeve, a spindle, a spindle seat, a spring, a turntable, and a turntable. The upper surface of the turntable is a plane, and a spindle seat is fixedly arranged at the center position of the upper surface of the turntable. A groove for accommodating the spindle is arranged in the spindle seat, and the lower end of the spindle is arranged in the groove; the spring is arranged between the groove and the lower end of the spindle, one end of the spring acts on the lower end of the spindle, and the other end acts on the bottom of the groove; a tapered sleeve is detachably fixed to the upper end of the spindle; the turntable is fixed on the turntable, and the turntable can drive the turntable to rotate.
[0007] In some embodiments, the turntable includes an upper rotating table, a rotating wheel, and a lower fixed groove, a rotating wheel is fixed to the bottom surface of the upper rotating table, a rotating wheel groove is provided in the lower fixed groove, and the rotating wheel is placed in the rotating wheel groove.
[0008] In a second aspect, an embodiment of the present application provides a method for acquiring an optimal wheel loading point, which is applied to an optimal wheel loading point acquisition device described in any of the above embodiments, and is characterized in that it includes the following steps: the rotating turntable drives the wheel to rotate one circle, and the first laser ranging sensor and the second laser ranging sensor both collect distance data of a certain number of evenly spaced position points; the distance data collected by the second laser ranging sensor is fitted by the least squares method to establish a virtual axial contour line, and N points with an interval of 360 / N degrees are selected on the virtual axial contour line each time to calculate the axial height difference relative to the theoretical axial contour line, for a total of 360 / N groups of data; the distance data collected by the first laser ranging sensor is fitted by the least squares method to establish a virtual radial contour line, and M points with an interval of 360 / M degrees are selected on the virtual radial contour line each time to calculate the radial deviation difference relative to the theoretical radial contour line, for a total of 360 / M groups of data; the N points with the smallest axial height difference are selected as the optimal loading points for the axial positioning of the wheel, and the M points with the smallest radial deviation difference are selected as the optimal loading points for the radial positioning of the wheel; wherein M and N are positive integers greater than or equal to 3.
[0009] In some embodiments, when selecting the optimal clamping point, two or more sets of data with the smallest axial height difference are first selected, and N points with the smallest radial deviation difference are selected as the optimal clamping points for axial positioning of the wheel.
[0010] In some embodiments, when selecting the optimal mounting point, an axial height difference threshold is set, and two or more sets of data with axial height differences less than the threshold are first selected, and N points with the smallest radial deviation difference are selected as the optimal mounting points for axial positioning of the wheel.
[0011] In some embodiments, the first linear module and the second linear module are adjusted so that the first laser ranging sensor corresponds to the middle position of the outer rim of the wheel in the vertical direction, and the second laser ranging sensor corresponds to the middle position of the outer rim of the wheel in the horizontal direction.
[0012] In a third aspect, the present invention provides a method for optimal wheel mounting, comprising the following steps: adopting a method for obtaining an optimal wheel mounting point as described in any of the above embodiments to obtain an optimal mounting point of the wheel; comparing the optimal mounting point with an allowable threshold of the optimal mounting point; if the optimal mounting point exceeds the allowable threshold, isolating the wheel and feeding back the mounting point information to the previous step of obtaining the optimal wheel mounting point; if the optimal mounting point is within the allowable threshold, marking the mounting point position on the wheel blank, and performing optimal mounting processing according to the optimal mounting point.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] The invention provides a device and method for obtaining an optimal mounting point of a wheel, and an optimal mounting method, comprising a first laser ranging sensor, a first linear module, a second laser ranging sensor, a second linear module, a taper sleeve, a mandrel, a mandrel seat, a spring, a turntable, and a turntable. The turntable can be rotated to cooperate with the first laser ranging sensor and the second laser ranging sensor to scan a wheel positioning surface (axial + radial) to find the optimal mounting point, so that the wheel can be fixed-point mounted according to the optimal mounting point, and the mounting error caused by the deformation of the blank can be solved to the greatest extent, and the problems of eccentricity, insufficient processing, and a large number of balanced waste products in the machining process can be improved, thereby improving the wheel yield and processing quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0016] Figure 1 It is a structural schematic diagram of a device for acquiring an optimal wheel mounting point according to the present invention.
[0017] Figure 2 The present invention is a radial clamping principle diagram of a device for acquiring an optimal clamping point of a wheel.
[0018] Figure 3 The invention discloses an axial clamping principle diagram of a device for obtaining an optimal clamping point of a wheel.
[0019] Figure 4 It is a schematic diagram of an optimal wheel clamping method of the present invention.
[0020] Wherein: 1-first laser distance sensor, 2-first linear module, 3-second laser distance sensor, 4-second linear module, 5-cone sleeve, 6-mandrel, 7-mandrel seat, 8-spring, 9-turntable, 10-turntable, 11-upper rotating table, 12-rotating wheel, 13-lower fixed groove, 14-wheel blank, 15-frame, 16-linear module mounting frame, 17-virtual radial contour line, 18-theoretical radial contour line, 19-radial eccentricity, a-first general a-common mounting point, b-second common mounting point, c-third common mounting point, a'-first radial optimal mounting point, b'-second radial optimal mounting point, c'-third radial optimal mounting point, 20-virtual axial contour line, 21-theoretical axial contour line, e-first axial common mounting point, f-second axial common mounting point, g-third axial common mounting point, e'-first axial optimal mounting point, f'-second axial optimal mounting point, g'-third axial optimal mounting point. DETAILED DESCRIPTION
[0021] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.
[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0023] The present application has found that the actual machined blank axial positioning surface has different degrees of end face deformation, and the radial positioning surface has different degrees of radial deformation. If the conventional random positioning and clamping method is adopted, it is easy to cause angle deviation due to end face deformation and position deviation due to radial deformation, resulting in problems such as eccentricity, insufficient processing, and many balanced scraps in the machining process, affecting the yield and processing quality of aluminum wheels. In order to solve the above problems, an embodiment of the present invention provides a device for obtaining the optimal clamping point of a wheel, including a first laser ranging sensor, a first linear module, a second laser ranging sensor, and a second linear module. The first linear module and the second linear module are vertically fixed, the first laser ranging sensor is fixed on the sliding seat of the first linear module, and the second laser ranging sensor is fixed on the sliding seat of the second linear module; the first laser ranging sensor is used to measure the distance of the middle position of the outer rim of the wheel in the vertical direction; the second laser ranging sensor is used to measure the distance of the middle position of the outer rim of the wheel in the horizontal direction. In this embodiment, a laser ranging sensor can be used to scan the radial positioning surface and the axial positioning surface of the blank before machining to find the optimal mounting point, and positioning and mounting processing can be performed according to the optimal mounting point to improve the problems of wheel deviation, incomplete processing, and large amount of balance waste in the machining process, thereby improving the wheel yield and processing quality.
[0024] In order to perform axial and radial positioning of the wheel blank and drive the wheel to rotate during the measurement process, in some embodiments, the device for obtaining the optimal mounting point of the wheel also includes a tapered sleeve, a spindle, a spindle seat, a spring, a turntable, and a turntable; the upper surface of the turntable is a plane, and a spindle seat is fixedly arranged at the center position of the upper surface of the turntable, a groove for accommodating the spindle is arranged in the spindle seat, and the lower end of the spindle is arranged in the groove; the spring is arranged between the groove and the lower end of the spindle, one end of the spring acts on the lower end of the spindle, and the other end acts on the bottom of the groove; a tapered sleeve is detachably fixed to the upper end of the spindle; the turntable is fixed on the turntable, and the turntable can drive the turntable to rotate
[0025] In some embodiments, the turntable includes an upper rotating table, a rotating wheel, and a lower fixed groove, a rotating wheel is fixed to the bottom surface of the upper rotating table, a rotating wheel groove is provided in the lower fixed groove, and the rotating wheel is placed in the rotating wheel groove.
[0026] In a second aspect, an embodiment of the present application provides a method for acquiring an optimal wheel loading point, which is applied to an optimal wheel loading point acquisition device described in any of the above embodiments, and is characterized in that it includes the following steps: the rotating turntable drives the wheel to rotate one circle, and the first laser ranging sensor and the second laser ranging sensor both collect distance data of a certain number of evenly spaced position points; the distance data collected by the second laser ranging sensor is fitted by the least squares method to establish a virtual axial contour line, and N points with an interval of 360 / N degrees are selected on the virtual axial contour line each time to calculate the axial height difference relative to the theoretical axial contour line, for a total of 360 / N groups of data; the distance data collected by the first laser ranging sensor is fitted by the least squares method to establish a virtual radial contour line, and M points with an interval of 360 / M degrees are selected on the virtual radial contour line each time to calculate the radial deviation difference relative to the theoretical radial contour line, for a total of 360 / M groups of data; the N points with the smallest axial height difference are selected as the optimal loading points for the axial positioning of the wheel, and the M points with the smallest radial deviation difference are selected as the optimal loading points for the radial positioning of the wheel; wherein M and N are positive integers greater than or equal to 3.
[0027] In some embodiments, when selecting the optimal clamping point, two or more sets of data with the smallest axial height difference are first selected, and N points with the smallest radial deviation difference are selected as the optimal clamping points for axial positioning of the wheel.
[0028] In some embodiments, when selecting the optimal mounting point, an axial height difference threshold is set, and two or more sets of data with axial height differences less than the threshold are first selected, and N points with the smallest radial deviation difference are selected as the optimal mounting points for axial positioning of the wheel.
[0029] In some embodiments, the first linear module and the second linear module are adjusted so that the first laser ranging sensor corresponds to the middle position of the outer rim of the wheel in the vertical direction, and the second laser ranging sensor corresponds to the middle position of the outer rim of the wheel in the horizontal direction.
[0030] In a third aspect, the present invention provides a method for optimal wheel mounting, comprising the following steps: adopting a method for obtaining an optimal wheel mounting point as described in any of the above embodiments to obtain an optimal mounting point of the wheel; comparing the optimal mounting point with an allowable threshold of the optimal mounting point; if the optimal mounting point exceeds the allowable threshold, isolating the wheel and feeding back the mounting point information to the previous step of obtaining the optimal wheel mounting point; if the optimal mounting point is within the allowable threshold, marking the mounting point position on the wheel blank, and performing optimal mounting processing according to the optimal mounting point.
[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0032] Embodiment 1:
[0033] like Figure 1 As shown in , this embodiment 1 provides a device for obtaining the optimal loading point of a wheel, including a frame 15, a linear module mounting frame 16, a first laser distance sensor 1, a first linear module 2, a second laser distance sensor 3, a second linear module 4, a taper sleeve 5, a mandrel 6, a mandrel seat 7, a spring 8, a turntable 9, and a turntable 10. The upper surface of the frame 15 is a plane, and the linear module mounting frame 16 is fixedly mounted to the upper surface of the frame 15 by screws, and the first linear module 2 and the second linear module 4 are fixedly mounted to the linear module mounting frame 16 by screws. The linear module is a linear transmission device, which mainly has two types: one is composed of a ball screw and a linear guide rail, and the other is composed of a synchronous belt and a synchronous pulley. The linear module has a wide range of uses, is easy to install, and has high precision. It has been accepted by a large number of users, eliminating the specific steps of making a linear motion mechanism by oneself.
[0034] The first linear module 2 and the second linear module 4 are vertically fixed to the linear module mounting frame 16. The first laser distance sensor 1 is fixed to the sliding seat of the first linear module 2, and the second laser distance sensor 3 is fixed to the sliding seat of the second linear module 4. The first laser distance sensor 1 is used to measure the distance of the middle position of the outer wheel rim in the vertical direction of the wheel. The second laser distance sensor 3 is used to measure the distance of the middle position of the outer wheel rim in the horizontal direction of the wheel.
[0035] The upper surface of the turntable 9 is a plane, and a spindle seat 7 is fixedly provided at the center position of the upper surface of the turntable 9. A groove for accommodating the spindle 6 is provided in the spindle seat 7, and the lower end of the spindle 6 is provided in the groove. The spring 8 is provided between the groove and the lower end of the spindle 6, and one end of the spring 8 acts on the lower end of the spindle 6, and the other end acts on the bottom of the groove. A taper sleeve 5 is detachably fixed to the upper end of the spindle 6, and the spindle 6 is installed in conjunction with the spindle seat 7 in combination with the spring 8. The taper sleeve 5 is installed on the spindle 6, and the wheel blank is installed on the taper sleeve 5. The turntable 9 is fixed on the turntable 10, and the turntable 10 can drive the turntable to rotate. The turntable 10 is fixedly connected to the upper surface of the frame 15 by screws, as shown in FIG. Figure 1 As shown in , the turntable 10 includes an upper turntable 11, a rotating wheel 12, and a lower fixed groove 13. The bottom surface of the upper turntable 11 is fixed with the rotating wheel 12, and the lower fixed groove 13 is provided with a rotating wheel groove, and the rotating wheel 12 is placed in the rotating wheel groove.
[0036] In actual use, a cone sleeve 5 of appropriate specifications is selected according to the wheel model, the wheel blank 14 is placed in the device, the spring 8 is compressed by gravity, radial positioning is performed through the cone sleeve 5, and axial positioning is performed through the turntable 9. The first linear module 2 drives the first laser ranging sensor 1 to move up and down to complete the vertical scanning of the outer wheel rim of the wheel (radial positioning surface), and the scanning position of the first laser ranging sensor 1 is calculated through the upper and lower edges of the outer wheel rim (the midpoint position of the upper and lower edges is taken). The second linear module 4 drives the second laser ranging sensor 3 to complete the horizontal scanning of the outer wheel rim of the wheel (axial positioning surface), and the scanning position of the second laser ranging sensor 3 is calculated through the left and right edges (the midpoint position of the left and right edges is taken). After determining the scanning position, adjust the first linear module 2 and the second linear module 4 so that the first laser ranging sensor 1 corresponds to the middle position of the outer rim of the wheel in the vertical direction, and the second laser ranging sensor 3 corresponds to the middle position of the outer rim of the wheel in the horizontal direction. Then, lock the positions of the first linear module 2 and the second linear module 4, and the turntable 10 drives the turntable 9 and the wheel blank 14 thereon to rotate. The laser ranging sensor completes the scanning of the outer rim of the wheel blank 14.
[0037] The method for obtaining the optimal wheel mounting point is as follows: the rotating turntable 10 drives the wheel blank 14 to rotate one circle, the first laser ranging sensor 1 and the second laser ranging sensor 3 both collect distance data of a certain number of evenly spaced position points (theoretically, the larger the number of collected position points, the better the fitting accuracy, but considering the circumference size of the wheel blank, the sensor accuracy and the measurement time, the number of position points can be reasonably selected, such as between 12 and 720); the distance data collected by the second laser ranging sensor is fitted by the least squares method to establish a virtual axial contour line, and each position point on the virtual axial contour line is N points with an interval of 360 / N degrees are selected each time to calculate the axial height difference relative to the theoretical axial contour line, with a total of 360 / N groups of data; the distance data collected by the first laser ranging sensor are fitted using the least squares method to establish a virtual radial contour line, and M points with an interval of 360 / M degrees are selected each time on the virtual radial contour line to calculate the radial deviation difference relative to the theoretical radial contour line, with a total of 360 / M groups of data; the N points with the smallest axial height difference are selected as the optimal mounting points for the axial positioning of the wheel, and the M point with the smallest radial deviation difference is selected as the optimal mounting point for the radial positioning of the wheel; wherein M and N are positive integers greater than or equal to 3.
[0038] like Figure 2 As shown in , when M=N=3, there are 3 radial positioning blocks and 3 axial positioning blocks. The outer cylindrical surface of the blank wheel lip is radially positioned by the radial positioning blocks to constrain its radial position freedom (that is, to limit its front, back, left, and right movement). The end face of the blank wheel lip is axially positioned by the axial positioning blocks to constrain its axial position freedom (that is, to limit its up and down movement). Due to the position deviation caused by radial deformation, there is a radial eccentricity 19 between the virtual radial contour line 17 (that is, the real radial contour line) and the theoretical radial contour line 18. If the first ordinary clamping point a, the second ordinary clamping point b, and the third ordinary clamping point c of ordinary clamping are used for clamping, it is easy to cause problems such as eccentricity, insufficient processing, and a lot of balanced scraps during machining, which affects the yield and processing quality of aluminum wheels. By using the device for acquiring the optimal wheel mounting point in Example 1, the distance data collected by the first laser ranging sensor 1 can be fitted using the least square method to establish a virtual radial contour line 17. Three points with an interval of 120 degrees are selected on the virtual radial contour line 17 each time to calculate the radial deviation difference relative to the theoretical radial contour line 18. A total of 120 groups of data are selected, and the three points with the smallest radial deviation difference are selected as the optimal mounting points for radial positioning of the wheel, such as Figure 2 The first radial optimal clamping point a', the second radial optimal clamping point b', and the third radial optimal clamping point C' shown in the figure can improve the problems of wheel deviation, incomplete processing, and large amount of balanced waste in the machining process, thereby improving the wheel yield and processing quality.
[0039] like Figure 3 As shown in , due to the different degrees of end face deformation of the axial positioning surface of the wheel blank, there is a deviation between the virtual axial contour line 20 (that is, the real axial contour line) and the theoretical axial contour line 21. If the first axial common clamping point e, the second axial common clamping point f, and the third axial common clamping point g are used for clamping, it is easy to cause problems such as deviation in machining, insufficient processing, and a large number of balanced scraps during machining, affecting the yield and processing quality of the aluminum wheel. Through a device for obtaining the optimal clamping point of a wheel in Example 1, the distance data collected by the second laser ranging sensor is fitted using the least squares method to establish a virtual axial contour line 20. Three points with an interval of 120 degrees are selected on the virtual axial contour line 20 each time to calculate the axial height difference relative to the theoretical axial contour line 21. There are 120 sets of data in total, and the three points with the smallest axial height difference are selected as the optimal clamping points for axial positioning of the wheel, as shown in FIG. Figure 3 The first axial optimal clamping point e', the second axial optimal clamping point f', and the third axial optimal clamping point g' shown in the figure can improve the problems of eccentricity, inadequate processing, and high balance waste in the machining process, thereby improving the wheel yield and processing quality.
[0040] In other embodiments, the radial positioning block and the axial positioning block are in the same position, and a specified number of data points are collected on both the radial and axial positioning surfaces (the number of data points collected in this prototype is 360 in the axial and radial directions). Since the deformation of the axial positioning surface is large and has a greater impact on quality issues such as balance, the optimal point of the axial positioning surface is selected as the first optimization choice, and the optimal point of the radial positioning surface is selected as the second optimization choice. The data collected from the axial positioning surface is fitted using the least squares method to establish a virtual plane. The height difference relative to the virtual plane is calculated at three points with an interval of 120 degrees, for a total of 120 groups of data. The group of data points with the best height difference is the axial optimal clamping point. The height difference of the axial common clamping point is defined as b, and the height difference of the axial optimal clamping point is defined as a. The floating of 10% (a+10%a) is used as the threshold of the axial optimal point. There are n groups (n is a positive integer) of axial optimal clamping points within the threshold range. Among them, a group of points with the smallest radial eccentricity is selected as the optimal clamping point. This clamping point ensures that both axial and radial clamping are in a relatively optimal state, and the axial direction is the main and the radial direction is the auxiliary.
[0041] In other embodiments, the radial positioning block and the axial positioning block are positioned in the same position. When selecting the optimal mounting point, two or more sets of data with the smallest axial height difference are first selected, and N points with the smallest radial deviation difference are selected as the optimal mounting points for the wheel.
[0042] In other embodiments, the radial positioning block and the axial positioning block are positioned in the same position. When selecting the optimal mounting point, an axial height difference threshold is set. The height difference of the axial optimal mounting point relative to the theoretical axial contour line is defined as a, and a 5-10% increase is used as the axial optimal point threshold. First, two or more groups of data with axial height differences less than the threshold are selected, and N points with the smallest radial deviation difference are selected as the optimal mounting points for the wheel.
[0043] Embodiment 2:
[0044] Embodiment 2 provides an optimal wheel mounting method, comprising the following steps: adopting a wheel optimal mounting point acquisition method described in any of the above embodiments to acquire the optimal mounting point of the wheel; comparing the optimal mounting point with an allowable threshold of the optimal mounting point (the allowable threshold is a certain range of floating up and down of the theoretical axial contour line and the theoretical radial contour line at the mounting point of the outer rim of the wheel as the allowable threshold of the mounting point, for example, 5-10% up and 5-10% down); if the optimal mounting point exceeds the allowable threshold, the wheel is isolated and the mounting point information is fed back to the previous step of acquiring the optimal wheel mounting point; if the optimal mounting point is within the allowable threshold, the mounting point position is marked on the wheel blank, and optimal mounting processing is performed according to the optimal mounting point.
[0045] like Figure 4 As shown in , when achieving optimal loading, firstly, the blank is loaded and the wheel blank is placed on the wheel optimal loading point acquisition device, then the wheel blank is positioned, and then the middle position of the outer rim of the wheel blank in the vertical direction and the middle position in the horizontal direction are laser measured, the data measured by the first laser ranging sensor and the second laser ranging sensor are stored and processed, and the optimal loading point is obtained by using a wheel optimal loading point acquisition method described in any of the above embodiments, and then the optimal loading point allowable threshold is set, and the optimal loading point is compared with the optimal loading point allowable threshold; if the optimal loading point exceeds the allowable threshold, the wheel is isolated and fed back to the previous step, and the wheel is judged to be unqualified; if the optimal loading point is within the allowable threshold range, the loading point position is marked on the wheel blank, and the optimal loading processing is performed according to the optimal loading point.
[0046] This solution can be applied to manual units. The optimal mounting point is marked manually with a marker pen, and the optimal mounting point is aligned with the axial positioning block and radial positioning block of the fixture to complete the optimized mounting. It can also be integrated for automation and applied to automated units. The optimal mounting point position information is stored and transmitted to the manipulator. After the manipulator rotates the specified angle, the wheel blank is placed in the machine tool fixture, and the optimal mounting point is aligned with the axial positioning block and radial positioning block of the fixture to complete the optimized mounting. The specific mounting method is to use the radial positioning block to radially position the wheel blank, the axial positioning block to axially position the wheel blank, and the pressing claw to press the wheel blank, thereby completing the machining of the wheel blank.
[0047] Two wheel types (wheel types with a higher balance deviation rate) were selected to verify the feasibility of the invention. 50 pieces were taken from each group of wheel types for normal clamping and optimized clamping. The processing technology, processing parameters, and testing equipment were kept consistent. The main evaluation index was the improvement of the wheel balance performance, as shown in Table 1. Table 1 shows the comparison of the balance performance of normal clamping and optimized clamping.
[0048]
[0049] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for general technical personnel in this field, according to the idea of the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.
Claims
1. A method for obtaining an optimal wheel loading point, comprising a first laser ranging sensor, a first linear module, a second laser ranging sensor, and a second linear module, wherein the first linear module and the second linear module are vertically fixed, the first laser ranging sensor is fixed on a sliding seat of the first linear module, and the second laser ranging sensor is fixed on a sliding seat of the second linear module; the first laser ranging sensor is used to measure the distance of the middle position of the outer wheel rim in the vertical direction of the wheel; the second laser ranging sensor is used to measure the distance of the middle position of the outer wheel rim in the horizontal direction of the wheel; It includes a cone sleeve, a mandrel, a mandrel seat, a spring, a turntable and a rotating table. The upper surface of the turntable is a plane. The mandrel seat is fixedly arranged at the center of the upper surface of the turntable. A groove for accommodating the mandrel is arranged in the mandrel seat, and the lower end of the mandrel is arranged in the groove. The spring is arranged between the groove and the lower end of the mandrel, one end of the spring acts on the lower end of the mandrel, and the other end acts on the bottom of the groove. The upper end of the mandrel is detachably fixed with a cone sleeve. The turntable is fixed on the rotating table, and the rotating table drives the turntable to rotate. The turntable comprises an upper turntable, a rotating wheel, and a lower fixed groove, wherein a rotating wheel is fixed to the bottom surface of the upper turntable, a rotating wheel groove is provided in the lower fixed groove, and the rotating wheel is placed in the rotating wheel groove; The steps include: the rotating turntable drives the wheel to rotate one circle, and the first laser distance measuring sensor and the second laser distance measuring sensor both collect distance data of a certain number of evenly spaced position points; The distance data collected by the second laser ranging sensor is fitted by the least square method to establish a virtual axial contour line. N points with an interval of 360 / N degrees are selected on the virtual axial contour line each time to calculate the axial height difference relative to the theoretical axial contour line, for a total of 360 / N groups of data; The distance data collected by the first laser ranging sensor is fitted by the least square method to establish a virtual radial contour line, and M points with an interval of 360 / M degrees are selected on the virtual radial contour line each time to calculate the radial deviation difference relative to the theoretical radial contour line, for a total of 360 / M groups of data; Select the N point with the smallest axial height difference as the optimal clamping point for the axial positioning of the wheel, and select the M point with the smallest radial deviation difference as the optimal clamping point for the radial positioning of the wheel; where M and N are positive integers greater than or equal to 3, characterized in that: When selecting the optimal mounting point, first select two or more sets of data with the smallest axial height difference, and then select N points with the smallest radial deviation difference as the optimal mounting points for axial positioning of the wheel.
2. A method for obtaining the optimal wheel loading point according to claim 1, characterized in that: When selecting the optimal mounting point, an axial height difference threshold is set, and two or more groups of data with axial height differences less than the threshold are first selected, and N points with the smallest radial deviation difference are selected as the optimal mounting points for axial positioning of the wheel.
3. A method for obtaining the optimal wheel loading point according to claim 1, characterized in that: The first linear module and the second linear module are adjusted so that the first laser ranging sensor corresponds to the middle position of the outer rim of the wheel in the vertical direction, and the second laser ranging sensor corresponds to the middle position of the outer rim of the wheel in the horizontal direction.
4. A wheel optimal clamping method, characterized in that: The method comprises the following steps: adopting a method for obtaining an optimal mounting point of a wheel as described in any one of claims 1 to 3 to obtain an optimal mounting point of the wheel; comparing the optimal mounting point with an allowable threshold of the optimal mounting point; if the optimal mounting point exceeds the allowable threshold, isolating the wheel and feeding back the mounting point information to the preceding step of obtaining the optimal mounting point of the wheel; if the optimal mounting point is within the allowable threshold, marking the mounting point position on the wheel blank, and performing optimal mounting processing according to the optimal mounting point.