Method for measuring the radius of a specified height of a body of revolution based on the combination of geometric quantities and roundness

Abstract

The present application relates to the field of contact measurement technology, in particular to a kind of radius measurement method of specified height 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;The highest position of the arc surface of standard ball is determined by measuring head, and the target height of the highest position of arc surface is determined;Record the target data of height sensor of measuring head at the highest position of arc surface;The measuring head is placed at the radius of standard ring, and the reading value of horizontal distance sensor and measuring head inductance table is recorded;The measuring head is placed at the measured section of specified height of rotary body part, the rotary platform is rotated, and the relevant measurement data is recorded, and the radius value corresponding to rotary body part at each angle is calculated. The purpose of the radius measurement method of specified height of rotary body based on combination of geometric quantity and roundness is to solve the problem that traditional rotary body part contact measurement cannot simultaneously carry out accurate measurement of geometric parameter and form error.

Description

Technical Field

[0001] This invention relates to the field of contact measurement technology, and more specifically to a method for measuring the radius of a rotating body at a specified height 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 the radius value at a specified height, a coordinate measuring machine can meet the requirements; however, for shape parameters related to roundness of 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 radius value at a specified height.

[0004] Therefore, the inventors provide a method for measuring the radius of a rotating body at a specified height 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 method for measuring the radius of a rotating body at a specified height based on a combination of geometric quantities and roundness, which solves the technical problem that traditional contact-based measurements of rotating parts cannot simultaneously perform accurate measurements of form and position errors and geometric parameters.

[0007] (2) Technical solution

[0008] This invention provides a method for measuring the radius of a solid of revolution at a specified height 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 align the self-aligning table.

[0010] With the probe in a fixed position, the probe is placed on the arc surface of the standard sphere in the vertical direction. The highest position of the arc surface is determined by the change in the probe reading.

[0011] Based on the height and position of the self-aligning platform plane, the height and diameter of the standard ball, determine the target height of the highest position of the arc surface;

[0012] Record the target data of the height sensor when the probe is at the highest position of the arc surface, and establish the relationship between the real-time measurement value of the height sensor and the specified height based on the target height and the target data;

[0013] Keeping the probe position unchanged, place the probe at the radius of the standard ring and record the value of the horizontal distance sensor and the reading of the probe inductance meter;

[0014] Place the rotating part on the self-aligning table to complete the self-aligning and tilting;

[0015] Keeping the probe position unchanged, place the probe at the cross-section to be measured at a specified height on the rotating part, 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 cross-section to be measured.

[0016] Based on the height sensor value, the horizontal distance sensor value, and the probe inductance meter value, calculate the radius value corresponding to the rotating part at each angle.

[0017] Furthermore, the target height is positively correlated with the height of the standard sphere, and the target height is inversely correlated with the radius of the standard sphere.

[0018] Furthermore, the formula for calculating the target height is as follows:

[0019]

[0020] In the formula, H Center H is the target height. Sphere D is the height of the standard sphere. C Let be the radius of the standard sphere.

[0021] Furthermore, the relationship between the real-time measurement value of the height sensor and the specified height is as follows:

[0022] H M=HH Center +H T ;

[0023] In the formula, H M H is the real-time measurement value of the height sensor. T H is the height sensor reading at the highest point of the arc, where H is the specified height. Center The target height is [the height of the target object].

[0024] Further, the step of calculating the radius 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] Based on the inner diameter of the standard ring, the outer diameter of the standard ring, the values ​​of the horizontal distance sensor when measuring the standard ring and the rotating part, and the values ​​of the probe inductance meter when measuring the standard ring and the rotating part, the radius of the rotating part at each angle is calculated.

[0026] Furthermore, the inner diameter of the rotating part is positively correlated with the inner diameter of the standard ring, and the inner diameter of the rotating part is negatively correlated with the value of the horizontal distance sensor when measuring the standard ring and the rotating part, and the value of the probe inductance meter when measuring the standard ring and the rotating part.

[0027] Furthermore, the outer diameter of the rotating part is positively correlated with the outer diameter of the standard ring and the value of the probe inductance meter when measuring the standard ring and the rotating part, and the outer diameter of the rotating part is negatively correlated with the value of the horizontal distance sensor when measuring the standard ring and the rotating part.

[0028] Furthermore, 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.

[0029] (3) Beneficial effects

[0030] In summary, this invention achieves simultaneous measurement of the radius and roundness of a rotating part at a specified height, as well as shape parameters related to roundness (such as roundness, runout, maximum runout, angle corresponding to the maximum runout, minimum runout, angle corresponding to the minimum runout, etc.) by combining the measurement method of radius and roundness of the rotating part. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is a flowchart illustrating a method for measuring the radius of a rotating body at a specified height based on a combination of geometric quantities and roundness, provided in an embodiment of the present invention.

[0033] 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.

[0034] Figure 3 This is a schematic diagram of the inner diameter of a rotating part at a specified height based on a combination of geometric quantities and roundness, provided in Embodiment 1 of the present invention.

[0035] Figure 4 This is a schematic diagram of the structure of a measuring device for a rotating part based on a combination of the radius and roundness of the rotating body, provided by the present invention.

[0036] In the picture:

[0037] 1-Standard ball; 2-Standard ring; 3-Self-aligning platform; 4-Probe; 5-Rotating platform; 6-Rotating parts. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] Figure 1 This is a flowchart illustrating a method for measuring the radius of a solid of revolution at a specified height based on a combination of geometric quantities and roundness, according to an embodiment of the present invention. The method may include the following steps:

[0041] S100. Place the standard ball 1 of known height at the center of the self-aligning platform 3, and align the self-aligning platform 3. Specifically, the alignment process of the self-aligning platform 3 is a routine operation and will not be described in detail here.

[0042] S200. Fix the probe position and place the probe 4 on the arc surface of the standard ball 1 in the vertical direction. Determine the highest position of the arc surface by observing the change in the probe 4 reading. Specifically, obtaining the measurement value of the highest position of the arc surface of the standard ball 1 through the probe 4 is a routine operation and will not be described in detail here.

[0043] S300. Based on the height and position of the self-aligning platform 3, the height and diameter of the standard ball 1, determine the target height of the highest position of the arc surface.

[0044] Specifically, the target height is positively correlated with the height of standard sphere 1, and the target height is inversely correlated with the radius of standard sphere 1.

[0045] The formula for calculating the target height is as follows:

[0046]

[0047] In the formula, H Center For the target height, H Sphere D is the height of a standard ball. C The radius of a standard sphere.

[0048] S400: Record the target data of the height sensor when the probe 4 is at the highest position of the arc surface, and establish the relationship between the real-time measurement value of the height sensor and the specified height based on the target height and the target data.

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

[0050] H M =HH Center +H T ;

[0051] In the formula, H M H is the real-time measurement value from the height sensor. T The height sensor reading is the value at the highest point of the arc, where H is the specified height. Center For target altitude.

[0052] S500, Keep the probe position unchanged, place the probe 4 at the radius of the standard ring 2, and record the value of the horizontal distance sensor and the reading of the probe inductance meter.

[0053] S600. Place the rotating part 6 on the self-aligning table 3 to complete the self-aligning and tilting.

[0054] S700. Keep the probe position unchanged, place the probe 4 at the measured section at the specified height of the rotating part 6, 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 section.

[0055] S800: Based on the height sensor value, horizontal distance sensor value, and probe inductance meter value, calculate the radius value corresponding to the rotating part 6 at each angle.

[0056] Specifically, based on the inner diameter of the standard ring 2, the outer diameter of the standard ring 2, the values ​​of the horizontal distance sensor when measuring the standard ring 2 and the rotating part, and the values ​​of the probe inductance meter when measuring the standard ring 2 and the rotating part, the radius corresponding to the rotating part 5 at each angle is calculated.

[0057] The radius values ​​corresponding to rotating part 5 include both inner and outer diameters:

[0058] 1) The inner diameter is calculated as follows: the inner diameter of the rotating part is positively correlated with the inner diameter of the standard ring, and the inner diameter of the rotating part is negatively correlated with the value of the horizontal distance sensor when measuring the standard ring and the rotating part, and the value of the probe inductance meter when measuring the standard ring and the rotating part.

[0059] 2) The outer diameter is calculated as follows: the outer diameter of the rotating part is positively correlated with the outer diameter of the standard ring and the value of the probe inductance meter when measuring the standard ball and the rotating part, and the outer diameter of the rotating part is negatively correlated with the value of the horizontal distance sensor when measuring the standard ring and the rotating part.

[0060] The specific calculation formula is as follows:

[0061]

[0062] In the formula, R M R is the radius of the rotating part. Inn R is the inner diameter of the standard ring. Ext L is the outer diameter of the standard ring. S L M These are the values ​​of the horizontal distance sensor when measuring a standard ring and when measuring a rotating part, respectively. S a M These are the values ​​of the probe inductance meter when measuring a standard ring and when measuring a rotating part, respectively.

[0063] 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 radius of a body of revolution at a specified height.

[0064] Example 1

[0065] Measure the radius of the rotating part at a specified height, using methods such as... Figure 4 The measuring device shown:

[0066] (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.

[0067] (2) Fix the probe position and place the probe 4 on the arc surface of the standard ball 1 in the vertical direction. Determine the highest position of the arc by observing the changes in the probe reading. Figure 2 As shown;

[0068] (3) Let the plane of the self-aligning platform 3 be at height 0, and the height of the standard ball 1 be H. Sphere =20, the diameter of standard sphere 1 is D C =4, then the height of the highest point of the arc is...

[0069] (4) Record the height sensor data when probe 4 is at the highest point of the arc, thereby establishing the relationship between the height sensor and the actual height. Let the height sensor value at this point be H. T =100, then at a specified height H=50, the height sensor value is H. M =HH Center +H T =132;

[0070] (5) Keeping the probe position unchanged, place the probe at the radius of standard ring 2, and record the value of the horizontal distance sensor and the reading of the probe inductance meter, such as... Figure 2 As shown;

[0071] (6) Place the rotating part 6 on the self-aligning table 3 to complete the self-alignment and tilting;

[0072] (7) Keeping the probe position unchanged, place the probe 4 at the measured section at the specified height of the rotating part 6, 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 section, such as... Figure 3 As shown;

[0073] (8) Calculate the radius of the rotating part 6 for each angle. Let the inner diameter of the standard ring 2 be R. Inn =40, outer diameter is R Ext =200, the horizontal distance sensor readings when measuring standard ring 2 and rotating part 6 are respectively L S =0 and L M =20, the values ​​of the probe inductance meter when measuring standard ring 2 and rotating part 6 are respectively a S =0.1 and a M =0.2, calculate the radius R of the rotating part 6. M as follows:

[0074]

[0075] 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.

[0076] 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 radius of a solid of revolution at a specified height 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 align the self-aligning table. With the probe in a fixed position, the probe is placed on the arc surface of the standard sphere in the vertical direction. The highest position of the arc surface is determined by the change in the probe inductance meter reading. Based on the height and position of the self-aligning platform plane, the height and diameter of the standard sphere, the target height of the highest position of the arc surface is determined; the formula for calculating the target height is as follows: In the formula, H Center H is the target height. Sphere D is the height of the standard sphere. C The diameter of the standard sphere; Record the target measurement value of the height sensor when the probe is at the highest position on the arc surface, and establish the relationship between the real-time measurement value of the height sensor and the specified height based on the target height and the target measurement value; the relationship between the real-time measurement value of the height sensor and the specified height is: H M =HH Center +H T In the formula, H M H is the real-time measurement value of the height sensor. T H is the target measurement value of the height sensor at the highest position of the probe on the arc, where H is the specified height. Center The target height; Keeping the probe position unchanged, place the probe at the radius of the standard ring and record the value of the horizontal distance sensor and the reading of the probe inductance meter; 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 cross-section to be measured at a specified height on the rotating part, 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 cross-section to be measured. Based on the height sensor value, the horizontal distance sensor value, and the probe inductance meter value, the radius value corresponding to the rotating part at each angle is calculated. Specifically, based on the inner diameter of the standard ring, the outer diameter of the standard ring, the value of the horizontal distance sensor when measuring the standard ring and the rotating part, and the value of the probe inductance meter when measuring the standard ring and the rotating part, the radius value corresponding to the rotating part at each angle is calculated. The radius value corresponding to the rotating part includes both the inner diameter and the outer diameter. The specific calculation formula is as follows: , , In the formula, R MInn R is the inner diameter of the rotating part. Inn L is the inner diameter of the standard ring. SInn L MInn These are the values ​​of the horizontal distance sensor when measuring the standard ring and the inner diameter of the rotating part, respectively. SInn a MInn These are the values ​​of the probe inductance meter when measuring the standard ring and the inner diameter of a rotating part, respectively; R MExt R is the outer diameter of the rotating part. Ext L is the outer diameter of the standard ring. SExt L MExt These are the values ​​of the horizontal distance sensor when measuring the standard ring and when measuring the outer diameter of a rotating part, respectively. SExt a MExt These are the values ​​of the probe inductance meter when measuring the standard ring and the outer diameter of the rotating part, respectively.

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

Images