Height measurement method for specified radius of a rotary body based on combination of geometric quantity and roundness

Abstract

The present application relates to the field of contact measurement technology, in particular to a kind of height measurement method of specified radius of rotary body based on combination of geometric quantity and roundness. It includes the following steps: the standard ball of known height is placed in the center of the centering table, and the centering table is aligned;Determine the highest position of the arc of the standard ball;The probe is placed at the highest position of the arc, the probe value is adjusted to zero, and the measurement value of the height sensor is read;Keep the pose of the probe unchanged, place the probe at the end surface of the specified radius of the rotary body part, rotate the rotary platform, and record the measurement data of each angle of the measured end surface;According to the measurement data, the height value corresponding to each angle of the rotary body part is calculated. The purpose of the height measurement method of specified radius of rotary body based on combination of geometric quantity and roundness is to solve the problem that the traditional contact measurement of rotary body part cannot simultaneously measure the geometric parameter and the geometric error.

Description

Technical Field

[0001] This invention relates to the field of contact measurement technology, and more specifically to a method for measuring the height of a rotating body with a specified radius based on a combination of geometric quantities and roundness. Background Technology

[0002] Existing contact measurement technologies for rotating parts fall into two categories: one is the geometric measurement method, the most representative of which is the coordinate measuring machine (CMM). This method acquires coordinate points in the X, Y, and Z dimensions to fit the shape of the workpiece and obtain its geometric information. The other is the roundness measurement method, the most representative of which is the roundness meter. This method acquires angle values ​​and measurements on the surface of the rotating body and evaluates the cross-sectional data of the workpiece in polar coordinates.

[0003] Both geometric measurement methods (such as those using a coordinate measuring machine) and roundness measurement methods have their limitations when measuring rotating parts. For dimensional measurements of parts, such as height values ​​at a specified radius, coordinate measuring machines can meet the requirements; however, for shape parameters related to roundness across multiple rotating sections, such as roundness, runout, maximum runout, the angle corresponding to the maximum runout, minimum runout, and the angle corresponding to the minimum runout, coordinate measuring machines are not effective. The difficulty lies in the fact that coordinate measuring machines (CMMs) can hardly collect the runout value of a complete circular cross-section. Even if they can, due to the working characteristics of CMMs, a reference circle needs to be defined first, and then several points on the circle need to be selected for measurement. If 360 or more points are selected, the measurement will take a very long time. Therefore, CMMs are not suitable for measuring the accurate shape parameters related to the roundness of the circular cross-section of rotating parts. On the other hand, roundness measuring instruments can collect data of the complete cross-section, so they can calculate the form and position errors of rotating parts, such as roundness, runout, maximum runout, the angle corresponding to the maximum runout, minimum runout, and the angle corresponding to the minimum runout, with relatively accurate parameters. However, roundness measuring instruments do not have calibrable geometric data, so they cannot measure and calculate the geometric parameters of rotating parts, such as the height value at a specified radius.

[0004] Therefore, the inventors provide a method for measuring the height of a rotating body at a specified radius based on a combination of geometric quantities and roundness. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] This invention provides a height measurement method for a specified radius of a rotating body based on a combination of geometric quantities and roundness, which solves the technical problem that traditional contact measurement of rotating parts cannot simultaneously perform accurate measurement of form and position errors and geometric parameters.

[0007] (2) Technical solution

[0008] This invention provides a method for measuring the height of a solid of revolution at a specified radius based on a combination of geometric quantities and roundness, comprising the following steps:

[0009] Place a standard ball of known height at the center of the self-aligning table, and then align the self-aligning table.

[0010] Determine the highest position of the arc of the standard sphere;

[0011] Based on the measurement value of the horizontal distance sensor at the highest position of the arc by the probe, the relationship between the real-time measurement value of the horizontal distance sensor and the specified radius is determined;

[0012] Place the probe at the highest position of the arc, adjust the probe value to zero, and read the measurement value from the height sensor;

[0013] Place the rotating part on the self-aligning table to complete the self-aligning and tilting;

[0014] Keeping the probe position unchanged, place the probe at the end face of the rotating part at a specified radius, rotate the rotating platform, and record the angle value, height sensor value, horizontal distance sensor value, and probe inductance value of each angle of the measured end face;

[0015] Based on the height sensor value, the horizontal distance sensor value, and the probe inductance meter value, calculate the height value corresponding to the rotating part at each angle.

[0016] Furthermore, the relationship between the real-time measurement value of the horizontal distance sensor and the specified radius is as follows:

[0017] L R =L C -R;

[0018] In the formula, L R L is the real-time measurement value of the horizontal distance sensor. C R is the horizontal distance sensor measurement value of the probe at the highest position of the arc, and R is the specified radius.

[0019] Further, the step of calculating the height value of the rotating part at each angle based on the height sensor value, the horizontal distance sensor value, and the probe inductance meter value is specifically as follows:

[0020] The height of the upper surface of the rotating part is positively correlated with the height of the standard ball, and the height of the upper surface of the rotating part is negatively correlated with the inductance value of the probe.

[0021] Furthermore, the formula for calculating the height of the upper end face of the rotating part is:

[0022] H M =HHC +H Sphere -a M ;

[0023] In the formula, H M H is the height of the upper end face of the rotating part, where H is the height measured by the height sensor at the upper end face of the rotating part. C H is the height sensor reading at the highest point of the arc where the probe is located. Sphere For the height of a standard ball, a M The value of the inductance meter of the probe.

[0024] Further, the step of calculating the height value of the rotating part at each angle based on the height sensor value, the horizontal distance sensor value, and the probe inductance meter value is specifically as follows:

[0025] The height of the lower end face of the rotating part is positively correlated with the height of the standard ball and the inductance value of the probe.

[0026] Furthermore, the formula for calculating the height of the lower end face of the rotating part is as follows:

[0027] H M =HH C +H Sphere +a M ;

[0028] In the formula, H M H is the height of the upper end face of the rotating part, where H is the height measured by the height sensor at the upper end face of the rotating part. C H is the height sensor reading at the highest point of the arc where the probe is located. Sphere For the height of a standard ball, a M The value of the inductance meter of the probe.

[0029] Furthermore, determining the highest position of the arc of the standard sphere specifically involves:

[0030] With the probe in a fixed position, place the probe on the upper arc surface of the standard sphere, and determine the highest position of the arc of the standard sphere by observing the changes in the probe reading.

[0031] Furthermore, the roundness is calculated by rotating the rotating part on an air-bearing turntable and reading the inductance meter reading pressed onto the rotating part.

[0032] (3) Beneficial effects

[0033] In summary, this invention achieves simultaneous measurement of the height value of a rotating part at a specified radius, as well as shape parameters related to roundness (such as roundness, runout, maximum runout value, angle corresponding to the maximum runout value, minimum runout value, angle corresponding to the minimum runout value, etc.) by combining the measurement method of the radius and roundness of the rotating part. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a flowchart illustrating a method for measuring the height of a rotating body with a specified radius based on a combination of geometric quantities and roundness, provided in an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of a structure for calibrating the height and radius of a rotating part before a specified height based on a combination of geometric quantities and roundness, as provided in Embodiment 1 of the present invention.

[0037] Figure 3 This is a schematic diagram of the structure of a rotating part with a specified radius based on a combination of geometric quantities and roundness, provided in Embodiment 1 of the present invention.

[0038] Figure 4 This is a schematic diagram of the structure of a measuring device for a rotating part based on a combination of geometric quantities and roundness, provided in Embodiment 1 of the present invention.

[0039] In the picture:

[0040] 1-Standard ball; 2-Standard ring; 3-Self-aligning platform; 4-Probe; 5-Rotating platform; 6-Rotating parts. Detailed Implementation

[0041] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Figure 1This is a flowchart illustrating a method for measuring the height of a solid of revolution at a specified radius based on a combination of geometric quantities and roundness, according to an embodiment of the present invention. The method may include the following steps:

[0044] S100. Place the standard ball 1 of known height at the center of the self-aligning table 3, and align the self-aligning table 3.

[0045] Specifically, the alignment process of the centering table 3 is a routine operation and will not be described in detail here. The rotating part 6 is rotated by carrying it on an air-bearing turntable, and the roundness is calculated by reading the inductance meter reading pressed onto the rotating part 6.

[0046] S200, Determine the highest position of the arc of standard ball 1.

[0047] Specifically, the probe position is fixed, and the probe 4 is placed on the upper arc surface of the standard ball 1. The highest position of the arc of the standard ball 1 is determined by the change of the probe reading.

[0048] S300. Based on the measurement value of the horizontal distance sensor at the highest position of the arc of the probe 4, determine the relationship between the real-time measurement value of the horizontal distance sensor and the specified radius.

[0049] Specifically, the relationship between the real-time measurement value of the horizontal distance sensor and the specified radius is as follows:

[0050] L R =L C -R;

[0051] In the formula, L R L is the real-time measurement value from the horizontal distance sensor. C R is the horizontal distance measured by the sensor at the highest point of the arc, where R is the specified radius.

[0052] S400. Place probe 4 at the highest position of the arc, adjust the probe value to zero, and read the measurement value from the height sensor.

[0053] S500. Place the rotating part 6 on the self-aligning table 3 to complete the self-aligning and tilting.

[0054] S600. Keep the probe position unchanged, place the probe 4 at the end face of the rotating part 6 at the specified radius, rotate the rotating platform 5, and record the angle value, height sensor value, horizontal distance sensor value and probe inductance value of each angle of the measured end face.

[0055] S700: Based on the height sensor value, horizontal distance sensor value, and probe inductance meter value, calculate the height value corresponding to the rotating part 6 at each angle.

[0056] Specifically, the height value corresponding to the rotating part 6 includes two cases: the upper end face and the lower end face.

[0057] 1) The height of the upper end face is calculated as follows: the height of the upper end face of the rotating part is positively correlated with the height of the standard ball, and the height of the upper end face of the rotating part is negatively correlated with the inductance value of the probe.

[0058] The formula for calculating the height of the upper end face of the rotating part is as follows:

[0059] H M =HH C +H Sphere -a M ;

[0060] In the formula, H M H represents the height of the upper end face of the rotating part, where H is the height measured by the height sensor at the upper end face of the rotating part. C H is the height sensor reading at the highest point of the arc where the probe is located. Sphere For the height of a standard ball, a M The value is the inductance meter reading of the probe.

[0061] 2) The height of the lower end face is calculated as follows: The height of the lower end face of the rotating part is positively correlated with the height of the standard ball and the inductance value of the probe.

[0062] The formula for calculating the height of the lower end face of the rotating part is as follows:

[0063] H M =HH C +H Sphere +a M ;

[0064] In the formula, H M H represents the height of the upper end face of the rotating part, where H is the height measured by the height sensor at the upper end face of the rotating part. C H is the height sensor reading at the highest point of the arc where the probe is located. Sphere For the height of a standard ball, a M The value is the inductance meter reading of the probe.

[0065] This invention utilizes a measurement method combining the radius and roundness of a body of revolution, overcoming the shortcomings of traditional coordinate measuring machines (CMMs). It can accurately and quickly measure shape parameters related to roundness, such as roundness, runout, maximum runout, the angle corresponding to the maximum runout, minimum runout, and the angle corresponding to the minimum runout. Furthermore, this method overcomes the limitations of traditional roundness measurement by accurately and quickly calculating the height of a cross-section of a body of revolution at a specified radius.

[0066] Example 1

[0067] To measure the height of a rotating part at a specified radius, use methods such as... Figure 4 The measuring device shown:

[0068] (1) Place the standard ball 1 of known height at the center of the self-aligning table 3, and align the self-aligning table 3.

[0069] (2) Fix the probe position and place the probe 4 on the upper arc surface of the standard sphere 1. Determine the highest position of the arc by observing the change in the probe reading, which is the center of the standard sphere 1. Figure 2 As shown;

[0070] (3) If the center of the self-aligning table 3 is horizontal 0, then the center of the standard ball 1 and the center of the self-aligning table 3 are coaxial and are also horizontal 0.

[0071] (4) Record the data from the horizontal distance sensor when the probe 4 is at the center of the standard sphere 1. Based on this, establish the relationship between the horizontal distance sensor reading and the actual radius. Let the horizontal distance sensor reading at this time be L. C =200, then at the specified radius position R=5, the horizontal distance sensor value is L. R =L C -R = 195;

[0072] (5) Place probe 4 at the center of standard ball 1, and adjust the probe value to 0. Let the height sensor value be H at this time. C =20, given that the height of standard sphere 1 is H Sphere =18, then the relationship between the actual height and the height sensor value can be found, such as Figure 2 As shown;

[0073] (6) Place the rotating part 6 on the self-aligning table 3 to complete the self-alignment and tilting;

[0074] (7) Keeping the probe position unchanged, place the probe 4 at the end face of the rotating part 6 at the specified radius, rotate the rotating platform 5, and record the angle value, height sensor value, horizontal distance sensor value, and probe inductance value for each angle of the measured end face, such as... Figure 3 As shown;

[0075] (8) Calculate the height of the rotating part 6 at each angle. Assume that when measuring the specified end face, the height sensor reading is H = 50, and the inductance meter reading during measurement is a. M =0.1, calculate the height H of the rotating part 6 at a specified radius. M as follows:

[0076]

[0077] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0078] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for measuring the height of a solid of revolution at a specified radius based on a combination of geometric quantities and roundness, characterized in that, The method includes the following steps: Place a standard ball of known height at the center of the self-aligning table, and then align the self-aligning table. To determine the highest position of the arc of the standard sphere, the probe is fixed in position and placed on the upper arc surface of the standard sphere. The highest position of the arc of the standard sphere is determined by the change in the reading of the probe inductance meter. Based on the measurement value of the horizontal distance sensor at the highest position of the arc, the relationship between the real-time measurement value of the horizontal distance sensor and the specified radius is determined as: L R =L C -R, where L R L is the real-time measurement value of the horizontal distance sensor. C R is the horizontal distance measured by the sensor at the highest position of the probe on the arc, where R is the specified radius; Place the probe at the highest position of the arc, adjust the probe inductance meter value to zero, and read the measurement value of the height sensor; Place the rotating part on the self-aligning table to complete the self-aligning and tilting; Keeping the probe position unchanged, place the probe at the end face of the rotating part at a specified radius, rotate the rotating platform, and record the angle value, height sensor value, horizontal distance sensor value, and probe inductance value of each angle of the measured end face; Based on the height sensor value, the horizontal distance sensor value, and the probe inductance value at each angle of the measured end face, the height value corresponding to the rotating part at each angle is calculated. The height value corresponding to the rotating part includes two cases: the upper end face and the lower end face. The formula for calculating the height of the upper end face of the rotating part is: H MUP =H UP -H C +H Sphere -a MUP In the formula, H MUP H is the height of the upper end face of the rotating part. UP H represents the height sensor value of the probe at the upper end face of the rotating part. C H is the height sensor reading at the highest point of the arc where the probe is located. Sphere For the height of a standard ball, a MUP The inductance of the probe is given at the upper end face of the rotating part. The formula for calculating the height of the lower end face of the rotating part is: H. MD =H D -H C +H Sphere +a MD In the formula, H MD H is the height of the lower end face of the rotating part. D H represents the height sensor value of the probe at the lower end face of the rotating part. C H is the height sensor reading at the highest point of the arc where the probe is located. Sphere For the height of a standard ball, a MD The value of the probe inductance is measured at the lower end face of the rotating part.

2. The height measurement method for a specified radius of a solid of revolution based on a combination of geometric quantities and roundness according to claim 1, characterized in that, The roundness is calculated by rotating the rotating part on an air-bearing turntable and reading the inductance meter reading of the probe pressed onto the rotating part.

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