Automatic positioning method for hub wire drawing machine machining

Abstract

The invention relates to the technical field of hub wire drawing machines, in particular to an automatic positioning method for machining of a hub wire drawing machine. The method is a positioning method for a turning tool nose and a hub first machining point, an automatic hub positioning system comprises a laser distance measuring sensor, a turning tool, a tool setting gauge and an automatic rotating tool table, the turning tool is installed on the automatic rotating tool table, the automatic rotating tool table can rotate by 360 degrees, and therefore the turning tool is driven to be switched in the directions of four positions, and the hub first machining point is obtained. The laser distance measuring sensor is located at a specific position on the automatic rotating tool table, a hub is arranged on one side of the automatic rotating tool table, the laser distance measuring sensor dynamically scans outer contour data of the hub, the first machining point coordinate A (x1, y1) of the hub is determined, the target position B (x2, y2) of a turning tool nose is calculated in combination with a deviation positioning distance parameter delta p set by the system, and finally the target position B (x0, y2) of the turning tool nose is calculated from the specific position of (x0, y2) to the specific position of (x0, y2). And the operation quantities of moving the target position point B (x2, y2) to the target position point B (x0, y0) are x'and y '.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub wire drawing machines, and in particular to an automatic positioning method for wheel hub wire drawing machine processing. Background Art

[0002] During the processing of the wheel hub wire drawing machine, the turning tool needs to be accurately aligned with the first processing point of the wheel hub. The existing alignment method is to manually judge with the eyes whether the first processing point is aligned with the tip of the turning tool. This method has low alignment accuracy and can only rely on manual feeling to affect the processing accuracy. In addition, excessive position deviation will cause damage to the original wheel hub curve during the wheel hub wire drawing process, and also affect the wire drawing efficiency and increase excessive wire drawing idle stroke movement. Therefore, we need a more precise alignment method to improve processing accuracy and efficiency. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a method for positioning the first processing point of a wheel hub wire drawing machine.

[0004] In view of the deficiencies of the prior art, the present invention solves the technical problems by adopting a technical solution: a method for automatic positioning of a wheel hub wire drawing machine, wherein a laser distance measuring 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, the wheel hub and the tool setting instrument are respectively located on both sides of the automatic rotating tool table, and the method is characterized in that 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 the system records the coordinate value of O(x,y);

[0006] Step 2: The virtual tool length L is obtained by the first automatic tool setting. When measuring, the standard turning tool needs to be turned to the direction of the tool setting instrument by automatically rotating the tool table. When measuring for the first time, the Y-axis coordinate value corresponding to point O is recorded as the virtual tool length L. 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;

[0007] Step 3: Calculation of tool size loss ΔL. After being used twice or multiple times, the turning tool will have a tool size loss ΔL. When measuring, the worn turning tool needs to be turned to the direction of the tool setting instrument by automatically rotating the tool table. The Y-axis coordinate value corresponding to point O at this time is recorded 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 turning tool.

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

[0009] Step 5: Determine the target position B (x2, y2) of the turning tool tip. According to the coordinates of the first processing point A (x1, y1) of the wheel hub and the deviation positioning distance parameter Δp set by the system, the target position point B of the turning tool tip positioning is calculated as (x2, y2) = {x1, y1-Δp}. The purpose of the deviation positioning distance parameter Δp is to prevent the turning tool tip from directly touching the first processing point, and to keep a certain safety distance from the coordinates A of the first processing point in the Y-axis direction.

[0010] Step 6: Calculate the travel distance x' and y' of the turning tool tip. The center point of the laser distance sensor is O(x, y). The turning tool tip rotates to any point (x0, y0) close to the wheel hub side. The movement of the turning tool tip from (x0, y0) to the target position point B is (x2, y2) = {x1, y1-Δp}. The travel distance on the X-axis and Y-axis is x' and y', then

[0011]

[0012] Preferably, step four also includes measuring the deviation between the tool tip of the standard turning tool and the center coordinates O(x, y) of the laser ranging sensor, the deviation in the X-axis direction is Δx, and the deviation in the Y-axis direction is Δy, and the deviation values ​​Δx and Δy are saved 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).

[0013] Preferably, the method for determining the coordinates A (x1, y1) of the first processing point of the wheel hub in step 4 is as follows: the measurement value of the laser ranging sensor is divided into two parts: the zero point length f and the measurement value m, wherein f is a fixed value obtained by caliper measurement, f is saved as a system parameter, and m is a dynamic measurement value that changes with the edge of the wheel hub, so the distance between the edge of the wheel hub 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 processing point A of the wheel hub is m1; when measuring the first processing point A of the wheel hub, the coordinates of the center coordinate O of the laser ranging sensor are (x c ,y c )=(x1,y c ), the coordinates of the first processing point of the hub are calculated to be (x1, y1), where x1 = x c ,y1=y c +f+m1.

[0014] Preferably, in step 5, the target position of the turning tool tip is determined as B(x2, y2)={x1, y1-Δp}={x1, y c +f+m1-Δp}.

[0015] Preferably, the tool tip movement amounts x' and y' are the displacements of the tool tip from any point (x0, y0) close to the wheel hub to the target position B (x2, y2) of the tool tip on the X-axis and Y-axis, (x0, y0) = (x-Δx, y+Δy-ΔL),

[0016]

[0017] The beneficial effects of the present invention are as follows: the present invention uses the laser ranging sensor to dynamically scan the hub outer contour data to determine the first processing point coordinate A (x1, y1) of the hub, and calculates the target position B (x2, y2) of the turning tool tip in combination with the deviation positioning distance parameter Δp set by the system, and finally calculates the running amount x' and y' of the turning tool tip moving 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 turning tool will have a certain degree of wear after use, and this wear will also affect the positioning accuracy of the first processing point, and finally the relationship between the running amount x' and y' and the center point of the laser ranging sensor O (x, y), the tool size loss ΔL, and the deviation value between the tool tip of the standard turning tool and the center coordinates (x, y) of the laser ranging sensor is obtained. Avoid the inaccuracy of manual tool setting, reduce the contour offset error, improve the tool setting accuracy of the first processing point of the hub, improve the aesthetics of the hub contour repair, and improve the convenience and automation of the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of an algorithm involved in the present invention;

[0020] Figure 3 It is a first processing point diagram and a target position schematic diagram involved in the present invention;

[0021] Figure 4 is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0023] As shown in the figure, the method of the present invention is a positioning method for the tip of a turning tool and the first processing point of a wheel hub. The wheel hub automatic positioning system includes a laser distance sensor (or a contact displacement sensor), a turning tool, a tool setting instrument, and an automatic rotating tool table. The turning tool is installed on the automatic rotating tool table. The automatic rotating tool table can rotate 360 ​​degrees, thereby driving the turning tool to switch directions at 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 instrument. Since the turning tool will have a certain degree of wear after use, the degree of wear will also affect the positioning accuracy of the first processing point. Therefore, the main purpose of using the tool setting instrument is to calculate the tool size loss ΔL. When measuring, the standard turning tool needs to be turned to the direction of the tool setting instrument 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 when it is not in use. When the turning tool is measured again with the tool setting instrument after use, due to the wear of the turning tool tip, the virtual tool length becomes smaller and is recorded as L'. Then the tool size loss ΔL=L-L', and the tool size loss ΔL is also the cumulative wear of the turning tool. In another case, when a new tool is replaced, there is no need to recalculate the virtual tool length L, and the tool setting operation can be performed directly. At this time, the ΔL measurement value can be a negative value, indicating that the new tool replaced at this time is slightly longer than the standard tool. After the tool size loss ΔL is determined, processing is performed. During processing, the tool is turned to the direction of the wheel hub, and the deviation between the tool tip coordinates of the standard turning tool and the center coordinates of the laser ranging sensor O (x, y) is measured. 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 saved as parameters in the control system.

[0024] Set as Figure 1 The X-axis and Y-axis directions are shown in . The present invention obtains the tool loss value of the turning tool tip through a tool setting instrument, and then dynamically scans the outer contour data of the hub through a laser distance sensor, calculates and obtains the positional relationship between the laser distance sensor and the hub to determine the coordinates A (x1, y1) of the first processing point of the hub, and 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 processing point position of the hub), avoiding the inaccuracy of manual tool setting, reducing the contour offset error, improving the tool setting accuracy of the first processing point of the hub, improving the aesthetics of the hub contour repair, and improving the ease of use and automation of the overall equipment.

[0025] A wheel hub wire drawing machine processing automatic positioning method, comprising the following steps:

[0026] Step 1: Establish a coordinate system to determine the center point of the laser ranging sensor as O(x, y), and 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 return is successful, the center coordinate of the laser ranging sensor O(x, y) = {0, 0}, and during subsequent movement, O(x, y) is consistent with the coordinate of the motion control system. The motion control system refers to the control system that controls the automatic rotating tool table to move in the X and Y directions.

[0027] Step 2: Automatically align the tool with the tool setting instrument for the first time to obtain the virtual tool length L. When measuring, the standard turning tool needs to be turned to the direction of the tool setting instrument by automatically rotating the tool table. When measuring for the first time, the Y-axis coordinate value corresponding to point O is recorded as the virtual tool length L. 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;

[0028] Step 3: Calculation of tool size loss ΔL. After being used twice or multiple times, the turning tool will have a tool size loss ΔL. When measuring, the worn turning tool needs to be turned to the direction of the tool setting instrument by automatically rotating the tool table. The Y-axis coordinate value corresponding to point O at this time is recorded 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 turning tool.

[0029] Step 4: Determine the coordinates of the first processing point A. Before executing step 4, determine the value of the tool size loss ΔL. The laser distance sensor dynamically scans the outer contour data of the wheel hub, calculates and obtains the positional relationship between the laser distance sensor and the wheel hub, and determines the coordinates of the first processing point A (x1, y1) of the wheel hub. The method for determining the coordinates of the first processing point A (x1, y1) of the wheel hub is as follows: The measurement value of the laser distance sensor is divided into two parts: the zero point length f and the measurement value m, where f is a fixed value obtained by caliper measurement, f is saved as a system parameter, and 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 distance sensor can be dynamically calculated as m+f; The dynamic measurement value of the laser distance sensor at the first processing point A of the wheel hub is m1; When measuring the first processing point A of the wheel hub, the coordinate of the center coordinate O of the laser distance sensor is (x c ,y c ), (x c ,y c ) is a determined value. At this time, the X-axis coordinates of point A and the center of the laser ranging sensor are the same, and the Y-axis coordinates differ by f+m1. The coordinates of the first processing point A of the hub are calculated to be (x1, y1), where x1 = x c ,y1=y c+f+m1. Measure the deviation between the tool tip of the standard turning tool and the center coordinate O(x, y) of the laser ranging 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 saved 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 turning tool tip. According to the coordinates of the first processing point A (x1, y1) of the wheel hub and the deviation positioning distance parameter Δp set by the system, the target position point B of the turning tool tip positioning is calculated as (x2, y2) = {x1, y1-Δp}. The purpose of the deviation positioning distance parameter Δp is to prevent the turning tool tip from directly touching the first processing point, and to leave a certain safety distance between the first processing point coordinate A and the target position point B in the Y-axis direction. The calculation shows that the target position B (x2, y2) of the turning tool tip = {x1, y1-Δp} = {x1, y c +f+m1-Δp}.

[0031] Step 6: Calculate the tool tip travel distance x' and y'. The center point of the laser distance sensor is O(x, y). The tool tip rotates to any point (x0, y0) close to the wheel hub side. The tool tip moves from (x0, y0) to the target position.

[0032] Set point B to (x2, y2) = {x1, y1-Δp} and the travel distances on the X-axis and Y-axis are x' and y', then

[0033]

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

[0035]

[0036] The tool tip movement amounts x' and y' are obtained, and the motion control system controls the automatic rotating tool table to drive the tool to move in the X and Y directions, and controls the tool tip to move to the first processing point coordinate A for operation.

[0037] Through the above steps, the present invention realizes accurate automatic tool setting instead of manual visual judgment, improves the accuracy of alignment between the first processing point and the tool tip, avoids the inaccuracy of manual tool setting, reduces contour offset errors, 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 setting instrument and an automatic rotating tool platform, the automatic rotating tool platform is provided with a laser distance sensor and a turning tool, the automatic rotating tool platform can rotate 360 ​​degrees and drive the turning tool to switch directions at four positions, the wheel hub and the tool setting instrument are respectively located on both sides of the automatic rotating tool platform, and the characteristics are: The following steps are included: Step 1: Establish a coordinate system to determine the center point of the laser ranging sensor as O(x,y), and the system records the coordinate value of O(x,y); Step 2: The virtual tool length L is obtained by the first automatic tool setting. When measuring, the standard turning tool needs to be turned to the direction of the tool setting instrument by automatically rotating the tool table. When measuring for the first time, the Y-axis coordinate value corresponding to point O is recorded as the virtual tool length L. 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 being used twice or multiple times, the turning tool will have a tool size loss ΔL. When measuring, the worn turning tool needs to be turned to the direction of the tool setting instrument by automatically rotating the tool table. The Y-axis coordinate value corresponding to point O at this time is recorded 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 turning tool. Step 4: Determine the coordinates of the first processing point A. Before executing step 4, determine the value of the tool size loss ΔL. The laser distance sensor dynamically scans the outer contour data of the hub, calculates and obtains the positional relationship between the laser distance sensor and the hub, and determines the coordinates of the first processing point A (x1, y1) of the hub. Step 5: Determine the target position B (x2, y2) of the turning tool tip. According to the coordinates of the first processing point A (x1, y1) of the wheel hub and the deviation positioning distance parameter Δp set by the system, the target position point B of the turning tool tip positioning is calculated as (x2, y2) = {x1, y1-Δp}. The purpose of the deviation positioning distance parameter Δp is to prevent the turning tool tip from directly touching the first processing point, and to keep a certain safety distance from the coordinates A of the first processing point in the Y-axis direction. Step 6: Calculate the travel distance x' and y' of the turning tool tip. The center point of the laser distance sensor is O(x, y). The turning tool tip rotates to any point (x0, y0) close to the wheel hub side. The movement of the turning tool tip from (x0, y0) to the target position point B is (x2, y2) = {x1, y1-Δp}. The travel distance on the X-axis and Y-axis is x' and y', then 2. The wheel hub wire drawing machine processing positioning method according to claim 1, characterized in that: Step four also includes measuring the deviation between the tool tip of the standard turning tool and the center coordinates O (x, y) of the laser ranging sensor, the deviation in the X-axis direction is Δx, and the deviation in the Y-axis direction is Δy, and saving the deviation values ​​Δx and Δy 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 wheel hub wire drawing machine processing positioning method according to claim 2, characterized in that: The method for determining the coordinates A(x1, y1) of the first processing point of the wheel hub in step 4 is as follows: the measurement value of the laser distance sensor is divided into two parts: the zero point length f and the measurement value m, where f is a fixed value obtained by caliper measurement, f is saved as a system parameter, and 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 distance sensor can be dynamically calculated as m+f; the dynamic measurement value of the laser distance sensor at the first processing point A of the wheel hub is m1; when measuring the first processing point A of the wheel hub, the coordinates of the center coordinate O of the laser distance sensor are (x c ,y c )=(x1,y c ), the coordinates of the first processing point of the hub are calculated to be (x1, y1), where x1 = x c ,y1=y c +f+m1.

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

5. The wheel hub wire drawing machine processing positioning method according to claim 4, characterized in that: The tool tip movement x' and y' are the displacements of the tool tip from any point (x0, y0) close to the wheel hub to the target position B (x2, y2) of the tool tip on the X-axis and Y-axis, (x0, y0) = (x-Δx, y+Δy-ΔL),

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