Wheel hub wire drawing machine processing automatic positioning method

Abstract

The present application relates to the technical field of wheel hub wire drawing machine, and particularly relates to a wheel hub wire drawing machine processing automatic positioning method. The present application is a positioning method for the tip of a turning tool and the first processing point of a wheel hub. The automatic positioning system of the wheel hub comprises a laser ranging sensor, a turning tool, a tool setting gauge, and an automatic rotating tool table. The turning tool is mounted on the automatic rotating tool table, which can rotate 360 degrees to switch the direction of the turning tool in four positions. The laser ranging sensor is located at a specific position on the automatic rotating tool table. The side of the automatic rotating tool table is the wheel hub. The laser ranging sensor dynamically scans the outer contour data of the wheel hub to determine the coordinate A(x1, y1) of the first processing point of the wheel hub. The target position B(x2, y2) of the tip of the turning tool is calculated in combination with the deviation positioning distance parameter Δp set by the system. Finally, the running amount x' and y' of the tip of the turning tool moving from the position (x0, y0) to the target position point B(x2, y2) is calculated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hub wire drawing machine, in particular to a hub wire drawing machine processing automatic positioning method. BACKGROUND

[0002] In the process of using the hub wire drawing machine, the turning tool needs to be accurately aligned with the first machining point of the hub. In the prior art, the alignment is achieved by manual visual judgment of the alignment of the first machining point and the turning tool tip. This way has low alignment accuracy and can only rely on manual feeling to affect the machining accuracy. Moreover, a large positional deviation will cause damage to the original hub curve during the hub wire drawing process, and also affects the wire drawing efficiency, thereby increasing the excessive wire drawing idle stroke movement. Therefore, a more accurate alignment method is needed to improve the machining accuracy and efficiency. SUMMARY

[0003] The present application solves the problem of providing a positioning method for the first machining point of a hub wire drawing machine.

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present application to solve the technical problems is: a hub wire drawing machine processing automatic positioning method, a laser ranging sensor and a turning tool are arranged on an automatic rotating tool table, the automatic rotating tool table can rotate 360 degrees and drive the turning tool to switch directions at four positions, a hub and a tool setting gauge are arranged on both sides of the automatic rotating tool table, and the method comprises the following steps.

[0005] Step 1: Establish a coordinate system to determine the center point of the laser ranging sensor as O(x, y), and record the coordinate value of O(x, y) by the system.

[0006] Step 2: Obtain a virtual tool length L by automatic tool setting for the first time. When measuring, the standard turning tool needs to be turned to the direction of the tool setting gauge by the automatic rotating tool table. The coordinate value of the Y axis corresponding to the O point when measuring for the first time is recorded as the virtual tool length L. The virtual tool length L is the coordinate value of the Y axis corresponding to the origin O after the turning tool is aligned with the tool setting gauge in the unused state.

[0007] Step 3: Calculate the tool size loss ΔL. After being used for the second time or multiple times, the turning tool has a tool size loss ΔL. When measuring, the worn turning tool needs to be turned to the direction of the tool setting gauge by the automatic rotating tool table. The coordinate value of the Y axis corresponding to the O point at this time is recorded as the virtual tool length L' after wear. The virtual tool length L' after wear is smaller than the virtual tool length L. Therefore, the tool size loss ΔL = L - L', and the tool size loss ΔL is also the cumulative wear of the turning tool.

[0008] Step 4: Determine the first machining point coordinate A(x1, y1) of the hub. Before executing step 4, the value of the tool size loss ΔL is determined. The laser ranging sensor dynamically scans the outer contour data of the hub, calculates the positional relationship between the laser ranging sensor and the hub, and determines the first machining point coordinate A(x1, y1) of the hub.

[0009] Step five: determining the target position B(x2, y2) of the turning tool tip, calculating the target position point B of the turning tool tip positioning as (x2, y2) = {x1, y1-Δp} according to the first machining point coordinate A(x1, y1) of the wheel hub and the system set deviation positioning distance parameter Δp, the purpose of the deviation positioning distance parameter Δp is to avoid the turning tool tip directly touching the first machining point, leaving a certain safety distance in the Y axis direction between the first machining point coordinate A and the wheel hub;

[0010] Step six: calculating the running amount x' and y' of the turning tool tip, the center point of the laser ranging sensor is O(x, y), the turning tool tip rotates to a point (x0, y0) close to the wheel hub side, and the turning tool tip moves from (x0, y0) to the target position point B (x2, y2) = {x1, y1-Δp} in the X axis and Y axis running amount x' and y', then

[0011]

[0012] Preferably, step four further includes measuring the deviation value of the tip of the standard turning tool from the center coordinate O(x, y) of the laser ranging sensor, the X axis direction deviation is Δx, and the Y axis direction deviation is Δy, and the deviation values Δx and Δy are saved as parameters in the control system, and after the tool size loss ΔL exists, any point (x0, y0) satisfies (x0, y0) = (x-Δx, y+Δy-ΔL).

[0013] Preferably, the determination method of the first machining point coordinate A(x1, y1) of the wheel hub in step four is as follows: the measurement value of the laser ranging sensor is divided into two parts of zero length f and measurement value m, wherein f is a fixed value obtained by measuring with a caliper, and f is saved as a system parameter, and m is a dynamic measurement value which changes with the wheel hub edge, so the distance between the wheel hub edge and the center of the laser ranging sensor can be dynamically calculated as m+f; the dynamic measurement value of the laser ranging sensor at the first machining point A of the wheel hub is m1; the center coordinate O of the laser ranging sensor when measuring the first machining point A of the wheel hub is (x c , y c ) = (x1, y c ), and the first machining point coordinate A of the wheel hub is calculated as (x1, y1), wherein x1 = x c , y1 = y c +f+m1.

[0014] Preferably, step five determines the target position B(x2, y2) of the turning tool tip as (x2, y2) = {x1, y1-Δp} = {x1, y c +f+m1-Δp}.

[0015] Preferably, the running amount x' and y' of the tool tip is the displacement amount of the tool tip from the point (x0, y0) near the hub side to the target position B (x2, y2) of the tool tip on the X axis and the Y axis, (x0, y0) = (x-Δx, y+Δy-ΔL),

[0016]

[0017] The beneficial effects of the present application are as follows: the present application uses a laser ranging sensor to dynamically scan the hub outer contour data to determine the first machining point coordinates A (x1, y1) of the hub, combines the deviation positioning distance parameter Δp set by the system to calculate the target position B (x2, y2) of the tool tip, and finally calculates the running amount x' and y' of the tool tip from (x0, y0) to the target position point B (x2, y2). In the process of calculating the running amount x' and y', the tool size loss ΔL is taken into account, because the tool will be worn to a certain extent after use, and this wear will also affect the positioning accuracy of the first machining point. Finally, the relationship between the running amount x' and y' and the center point O (x, y) of the laser ranging sensor, the tool size loss ΔL, and the deviation value between the tool tip of the standard tool and the center coordinates (x, y) of the laser ranging sensor is obtained. Avoiding the inaccuracy of manual tool setting, reducing the contour deviation error, improving the tool setting accuracy of the first machining point of the hub, improving the aesthetic degree of the hub contour repair, and improving the use convenience and automation degree of the overall equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram related to the present application;

[0019] Figure 2 is an algorithm schematic diagram related to the present application;

[0020] Figure 3 is a first machining point diagram and a target position schematic diagram related to the present application;

[0021] Figure 4 is a flowchart of the method of the present application. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in conjunction with the drawings and specific embodiments. The embodiments of the present application are given for the purpose of illustration and description, and are not exhaustive or limit the present application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles and practical application of the present application, and to enable those of ordinary skill in the art to understand the present application in order to design various embodiments with various modifications suitable for specific purposes.

[0023] As shown in the figure, the method of the present application is a positioning method for the tip of a turning tool and the first machining point of a wheel hub. The automatic positioning system for the wheel hub comprises a laser distance sensor (or a contact displacement sensor), a turning tool, a tool setting gauge, and an automatic rotating tool table. The turning tool is mounted on the automatic rotating tool table, which can rotate 360 degrees to switch the direction of the turning tool in four positions. The laser distance sensor is located at a specific position on the automatic rotating tool table. One side of the automatic rotating tool table is the wheel hub, and the other side is the tool setting gauge. Since the turning tool will be worn to some extent after use, the degree of wear will also affect the positioning accuracy of the first machining point. Therefore, the main purpose of using the tool setting gauge is to calculate the tool size loss AL. When measuring, the standard turning tool needs to be turned to the direction of the tool setting gauge through the automatic rotating tool table, and the virtual tool length L is recorded. The virtual tool length L is the state of the turning tool before use. When the turning tool is used again and measured by the tool setting gauge, the virtual tool length becomes smaller due to the wear of the turning tool tip, which is recorded as L'. Therefore, the tool size loss AL = L - L'. The tool size loss AL is also the cumulative wear of the turning tool. In another case, when a new tool is replaced, the virtual tool length L does not need to be recalculated, and the tool setting operation can be directly performed. At this time, the measurement value of AL can be negative, indicating that the new tool replaced is slightly longer than the standard tool. After the tool size loss AL is determined, the machining is performed. During machining, the tool is turned to the direction of the wheel hub, the deviation of the tip coordinates of the standard turning tool and the center coordinates O(x, y) of the laser distance sensor is measured, the deviation in the X-axis direction is Ax, and the deviation in the Y-axis direction is Ay. The deviation values Ax and Ay are saved as parameters in the control system.

[0024] The X-axis and Y-axis directions are set as shown in Figure 1 The present application obtains the tool wear value of the turning tool tip through the tool setting gauge, then dynamically scans the outer contour data of the wheel hub through the laser distance sensor, calculates the position relationship between the laser distance sensor and the wheel hub to determine the first machining point coordinates A(x1, y1) of the wheel hub, then calculates the target position B(x2, y2) of the turning tool tip, and automatically positions the turning tool tip to the target position B(x2, y2) (close to the first machining point position of the wheel hub), thereby avoiding the inaccuracy of manual tool setting, reducing the contour deviation error, improving the tool setting accuracy of the first machining point of the wheel hub, improving the aesthetic degree of the wheel hub contour repair, and improving the use convenience and automation degree of the overall equipment.

[0025] An automatic positioning method for a wheel hub wire drawing machine, comprising the following steps:

[0026] Step one: Establishing coordinate system to determine the center point of laser ranging sensor as O(x, y), the system records the coordinate value of O(x, y); assuming that the center O of the laser ranging sensor is the coordinate origin, when the mechanical zero returns successfully, the center coordinate O(x, y) of the laser ranging sensor is {0, 0}, and the O(x, y) is consistent with the motion control system coordinate during the later movement, the motion control system refers to the control system for controlling the automatic rotating tool table to move in the X and Y directions.

[0027] Step two: automatically aligning the tool with the tool setting gauge to obtain the virtual tool length L, when measuring, the standard turning tool needs to be turned to the direction of the tool setting gauge through the automatic rotating tool table, and the coordinate value of the Y axis corresponding to the O point during the first measurement is recorded as the virtual tool length L, the virtual tool length L is the coordinate value of the Y axis corresponding to the origin O after the turning tool is aligned with the tool setting gauge in the unused state;

[0028] Step three: calculation of tool size loss ΔL, after being used twice or more times, the turning tool has tool size loss ΔL, when measuring, the worn turning tool needs to be turned to the direction of the tool setting gauge through the automatic rotating tool table, and the coordinate value of the Y axis corresponding to the O point at this time is recorded as the virtual tool length L' after being worn, the virtual tool length L' after being worn is smaller than the virtual tool length L, then the tool size loss ΔL=L-L' is the cumulative wear of the turning tool;

[0029] Step four: determination of the first machining point coordinate A point, the value of the tool size loss ΔL is determined before step four is executed, the laser ranging sensor dynamically scans the wheel hub outer contour data, calculates the position relationship between the laser ranging sensor and the wheel hub, and determines the first machining point coordinate A(x1, y1) of the wheel hub. The determination method of the first machining point coordinate A(x1, y1) of the wheel hub is as follows: the measurement value of the laser ranging sensor is divided into two parts of zero point length f and measurement value m, wherein f is a fixed value obtained by measuring with a caliper, and f is saved as a system parameter, and m is a dynamic measurement value which changes with the wheel hub edge, so the distance between the wheel hub edge and the center of the laser ranging sensor can be dynamically calculated as m+f; the dynamic measurement value of the laser ranging sensor at the first machining point A of the wheel hub is m1; when the first machining point A of the wheel hub is measured, the center coordinate O of the laser ranging sensor is (x c , y c ), (x c , y c ) is a determined value, at this time, the A point has the same X axis coordinate as the center of the laser ranging sensor, and the Y axis coordinate is different by f+m1, the first machining point coordinate A of the wheel hub is calculated as (x1, y1), wherein x1=x c , y1=y c+f+m1. Measure the deviation between the tip of a standard lathe tool and the center coordinates O(x, y) of the laser rangefinder sensor. The deviation in the X-axis direction is Δx, and the deviation in the Y-axis direction is Δy. These deviation values ​​Δx and Δy are stored as parameters in the control system. After the tool size loss ΔL exists, any point (x0, y0) satisfies (x0, y0) = (x - Δx, y + Δy - ΔL).

[0030] Step 5: Determine the target position B(x2, y2) of the cutting tool tip. Based on the coordinates of the first machining point A(x1, y1) of the hub and the system-set deviation positioning distance parameter Δp, calculate the target position B of the cutting tool tip as (x2, y2) = {x1, y1 - Δp}. The purpose of the deviation positioning distance parameter Δp is to avoid the cutting tool tip directly touching the first machining point, and to maintain a safe distance between the coordinates of the first machining point A and the target position B in the Y-axis direction. Calculation shows that the target position B(x2, y2) of the cutting tool tip = {x1, y1 - Δp} = {x1, y2, y ... c +f+m1-Δp}.

[0031] Step Six: Calculate the tool tip travel distances x' and y'. The center point of the laser rangefinder is O(x,y). The tool tip rotates to any point (x0,y0) near the wheel hub. The tool tip then moves from (x0,y0) to the target position.

[0032] If point B is set to (x2, y2) = {x1, y1 - Δp}, and its movement along the X and Y axes is x' and y' respectively, then...

[0033]

[0034] The tool tip travels x' and y' are the same as the displacement of the laser rangefinder center point O(x,y), where (x0,y0)=(x-Δx,y+Δy-ΔL).

[0035]

[0036] This yields the tool tip travel distances x' and y'. The motion control system then controls the automatic rotary tool turret to move the tool in the X and Y directions, controlling the tool tip to move to the first machining point coordinate A for operation.

[0037] Through the above steps, this invention achieves precise automatic tool setting instead of manual visual judgment, improves the accuracy of the alignment between the first machining point and the tool tip, avoids the inaccuracy of manual tool setting, reduces contour offset error, and improves the aesthetics of wheel hub contour repair.

Claims

1. An automatic positioning method for wheel hub wire drawing machine processing, comprising a tool setter and an automatic rotary tool table, wherein the automatic rotary tool table is equipped with a laser rangefinder and a cutting tool, the automatic rotary tool table can rotate 360 ​​degrees and drive the cutting tool to switch directions in four positions, the wheel hub and the tool setter are respectively located on both sides of the automatic rotary tool table, characterized in that: Includes the following steps, Step 1: Establish a coordinate system and determine the center point of the laser rangefinder sensor as O(x,y). Record the coordinate values ​​of O(x,y) in the system. Step 2: Obtain the virtual tool length L through the initial automatic tool setting. During measurement, the standard turning tool needs to be turned towards the tool setting instrument by automatically rotating the tool table. Record the Y-axis coordinate value corresponding to point O as the virtual tool length L during the first measurement. The virtual tool length L is the Y-axis coordinate value corresponding to the origin O after the turning tool is aligned with the tool setting instrument when the turning tool is not in use. Step 3: Calculation of tool size loss ΔL. After two or more uses, the cutting tool will have a tool size loss ΔL. During measurement, the worn cutting tool needs to be turned towards the tool setter by automatically rotating the tool table. Record the Y-axis coordinate value corresponding to point O at this time as the virtual tool length L' after wear. If the virtual tool length L' after wear is less than the virtual tool length L, then the tool size loss ΔL = L - L'. The tool size loss ΔL is also the cumulative wear of the cutting tool. Step 4: Determine the coordinates of the first machining point A. Before executing Step 4, determine the value of the tool size loss ΔL. The laser rangefinder dynamically scans the outer contour data of the wheel hub, calculates and obtains the positional relationship between the laser rangefinder and the wheel hub, and determines the coordinates of the first machining point A(x1, y1) of the wheel hub. Step 5: Determine the target position B(x2, y2) of the cutting tool tip. Based on the coordinates A(x1, y1) of the first machining point of the hub and the deviation positioning distance parameter Δp set by the system, calculate the target position B of the cutting tool tip as (x2, y2) = {x1, y1 - Δp}. The purpose of the deviation positioning distance parameter Δp is to avoid the cutting tool tip directly touching the first machining point and to keep a certain safe distance between the coordinates A of the first machining point and the first machining point in the Y-axis direction. Step Six: Calculate the tool tip travel distances x' and y'. The center point of the laser rangefinder is O(x,y). The tool tip rotates to any point (x0, y0) near the wheel hub. The tool tip moves from (x0, y0) to the target position B as (x2, y2) = {x1, y1 - Δp}. The travel distances along the X and Y axes are x' and y', respectively.

2. The wheel hub wire drawing machine positioning method as described in claim 1, characterized in that: Step four also includes measuring the deviation between the tip of the standard lathe tool and the center coordinates O(x, y) of the laser rangefinder sensor. The deviation in the X-axis direction is Δx, and the deviation in the Y-axis direction is Δy. The deviation values ​​Δx and Δy are stored as parameters in the control system. After the tool size loss ΔL exists, any point (x0, y0) satisfies (x0, y0) = (x-Δx, y+Δy-ΔL).

3. The automatic positioning method for wheel hub wire drawing machine processing as described in claim 2, characterized in that: The method for determining the coordinates A(x1, y1) of the first machining point of the wheel hub in step four is as follows: The measurement value of the laser rangefinder is divided into two parts: the zero-point length f and the measurement value m. f is a fixed value obtained through caliper measurement and is stored as a system parameter. m is a dynamic measurement value that changes with the edge of the wheel hub. Therefore, the distance between the edge of the wheel hub and the center of the laser rangefinder can be dynamically calculated as m + f. The dynamic measurement value of the laser rangefinder at the first machining point A of the wheel hub is m1. When measuring the first machining point A of the wheel hub, the coordinates O of the center of the laser rangefinder are (x1, y1). c y c )=(x1, y c The coordinates A of the first machining point of the wheel hub are calculated to be (x1, y1), where x1 = x c ,y1=y c +f+m1.

4. The automatic positioning method for wheel hub wire drawing machine processing as described in claim 3, characterized in that: Step 5: Determine the target position of the cutting tool tip B(x2, y2) = {x1, y1 - Δp} = {x1, y2, y1 - Δp} c +f+m1-Δp}.

5. The automatic positioning method for wheel hub wire drawing machine processing as described in claim 4, characterized in that: The tool tip travel distances x' and y' are the displacements of the tool tip from any point (x0, y0) near the hub to the target position B(x2, y2) along the X and Y axes, respectively, where (x0, y0) = (x - Δx, y + Δy - ΔL).

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