Evaluation system and evaluation method for coaxiality of cylindrical curved surface

Abstract

The invention relates to the technical field of coaxiality evaluation, and discloses a system and method for evaluating the coaxiality of a cylindrical curved surface, and the system comprises a detection module which comprises a spring expansion sleeve, a central spindle which is coaxial with the spring expansion sleeve, and a dial indicator which is installed at the end part of the central spindle, and the spring expansion sleeve is installed in a first detected workpiece; a measuring head of the dial indicator is contacted with the side wall of the inner hole of the second measured workpiece; the evaluation module comprises a control unit and is used for controlling the detection module to carry out detection; the acquisition unit is used for acquiring detection data of the dial indicator; the processing unit is used for preprocessing the detection data, determining a deviation value of circumferential points on each circumference of the inner hole of the second detected workpiece, and determining the out-of-roundness of each circumference according to the deviation value; and the evaluation unit is used for determining the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circumference. Through automatic measurement and calculation, the accuracy and efficiency of coaxiality evaluation can be remarkably improved, and powerful support is provided for industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of coaxiality evaluation, and in particular to an evaluation system and method for the coaxiality of a cylindrical surface. Background Art

[0002] In industrial production, coaxiality is one of the important parameters for evaluating the quality of parts, especially in situations involving high-precision rotating parts. Traditional coaxiality evaluation methods often rely on manual measurement and calculation, which is not only inefficient but also easily affected by human factors, resulting in inaccurate evaluation results. Therefore, there is an urgent need for an evaluation system and method for the coaxiality of cylindrical surfaces. Through automated measurement and calculation, the accuracy and efficiency of coaxiality evaluation can be significantly improved, providing strong support for industrial production. Summary of the invention

[0003] The purpose of the present invention is to provide an evaluation system and method for the coaxiality of cylindrical surfaces, so as to solve the problem that traditional coaxiality evaluation methods often rely on manual measurement and calculation, which is not only inefficient but also easily affected by human factors, resulting in inaccurate evaluation results.

[0004] The present invention provides an evaluation system for the coaxiality of a cylindrical surface, comprising:

[0005] The detection module includes a spring expansion sleeve, a mandrel and a dial indicator, wherein the spring expansion sleeve is installed in a first workpiece to be measured, the mandrel is coaxially arranged with the spring expansion sleeve, the dial indicator is installed at the end of the mandrel, the probe of the dial indicator contacts the side wall of the inner hole of the second workpiece to be measured, and the second workpiece to be measured is connected to the first workpiece to be measured;

[0006] An evaluation module, comprising a control unit, a collection unit, a processing unit and an evaluation unit;

[0007] The control unit is connected to the detection module, and the control unit is used to control the detection module to detect the coaxiality of the first workpiece to be measured and the second workpiece to be measured;

[0008] The acquisition unit is connected to the dial gauge, and is used to obtain detection data of the dial gauge when the detection module performs detection, and the detection data includes detection data of several circumferences of the inner hole of the second workpiece to be detected;

[0009] The processing unit is connected to the acquisition unit, and is used to pre-process the detection data, determine the deviation value of the circumferential point on each circumference of the inner hole of the second measured workpiece according to the pre-processed detection data, and determine the out-of-roundness of each circumference according to the deviation value;

[0010] The evaluation unit is connected to the processing unit, and is used to determine the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circumference.

[0011] Preferably, a bearing is installed at the end of the mandrel, a connecting block is provided on the side of the bearing, a bracket is provided on the connecting block, the dial gauge is installed on the bracket, and the probe of the dial gauge is perpendicular to the axis of the second workpiece to be measured;

[0012] The bearing is connected to the control unit, and the control unit is used to control the bearing to rotate at a constant speed to drive the dial indicator to detect the inner hole of the second workpiece to be measured.

[0013] Preferably, the preprocessing includes normalization processing, defining time intervals and determining sampling time points.

[0014] Preferably, when the processing unit is used to determine the deviation value of each circumferential point on the circumference of the inner hole of the second measured workpiece according to the preprocessed detection data, it includes:

[0015] Set the detection data at the initial time point as calibration data;

[0016] Determine a detection difference between each detection data and the calibration data, and determine a deviation value of a circumferential point according to the detection difference and the time interval;

[0017] The deviation value is determined according to the following formula:

[0018]

[0019] Among them, P ij represents the deviation value of the jth circumference point of the i-th circle, C ij represents the detection data of the jth circumference point of the i-th circle, C i0 represents the calibration data of the i-th circle, and Δt represents the sampling time interval.

[0020] Preferably, when the processing unit is used to determine the out-of-roundness of each circle according to the deviation value, the out-of-roundness is determined according to the following formula:

[0021]

[0022] Among them, E i represents the out-of-roundness of the i-th circle, and m represents the number of circumferential points on the i-th circle.

[0023] Preferably, when the evaluation unit is used to determine the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circle, it includes:

[0024] Determine the initial coaxiality of the first workpiece to be measured and the second workpiece to be measured corresponding to the circumference according to the out-of-roundness of each circumference;

[0025] Comparing the initial coaxiality, determining the maximum value of the initial coaxiality, and setting the maximum value as the coaxiality of the first measured workpiece and the second measured workpiece;

[0026] The initial coaxiality is determined according to the following formula:

[0027] Ai=a×E i ;

[0028] Wherein, Ai represents the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the i-th circle, and a represents the influence coefficient.

[0029] The present invention also discloses a method for evaluating the coaxiality of a cylindrical surface, which is applied to the above-mentioned system for evaluating the coaxiality of a cylindrical surface, and comprises:

[0030] Controlling the detection module to detect the coaxiality of the first workpiece to be measured and the second workpiece to be measured;

[0031] When the detection module performs detection, the detection data of the dial indicator is obtained, and the detection data includes detection data of several circumferences of the inner hole of the second workpiece to be detected;

[0032] Preprocessing the detection data, determining the deviation value of the circumferential point on each circumference of the inner hole of the second measured workpiece according to the preprocessed detection data, and determining the out-of-roundness of each circumference according to the deviation value;

[0033] The coaxiality of the first workpiece to be measured and the second workpiece to be measured is determined according to the out-of-roundness of each circle.

[0034] Preferably, the detection data is preprocessed, and the deviation value of each circumferential point on the circumference of the inner hole of the second detected workpiece is determined according to the preprocessed detection data, including

[0035] The preprocessing includes normalization processing, delimiting time intervals and determining sampling time points;

[0036] Set the detection data at the initial time point as calibration data;

[0037] Determine a detection difference between each detection data and the calibration data, and determine a deviation value of a circumferential point according to the detection difference and the time interval;

[0038] The deviation value is determined according to the following formula:

[0039]

[0040] Among them, P ijrepresents the deviation value of the jth circumference point of the i-th circle, C ij represents the detection data of the jth circumference point of the i-th circle, C i0 represents the calibration data of the i-th circle, and Δt represents the sampling time interval.

[0041] Preferably, the out-of-roundness is determined according to the following formula:

[0042]

[0043] Among them, E i represents the out-of-roundness of the i-th circle, and m represents the number of circumferential points on the i-th circle.

[0044] Preferably, determining the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circle includes:

[0045] Determine the initial coaxiality of the first workpiece to be measured and the second workpiece to be measured corresponding to the circumference according to the out-of-roundness of each circumference;

[0046] Comparing the initial coaxiality, determining the maximum value of the initial coaxiality, and setting the maximum value as the coaxiality of the first measured workpiece and the second measured workpiece;

[0047] The initial coaxiality is determined according to the following formula:

[0048] Ai=a×E i ;

[0049] Wherein, Ai represents the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the i-th circle, and a represents the influence coefficient.

[0050] Compared with the prior art, the beneficial effect of the present invention is that the present invention can significantly improve the accuracy and efficiency of coaxiality evaluation through automated measurement and calculation, providing strong support for industrial production. By applying the evaluation system and evaluation method of the present invention, enterprises can more accurately grasp the coaxiality of parts and components, providing strong guarantee for product quality control. At the same time, the method also has the advantages of simple operation and fast measurement speed, and can meet the needs of large-scale production.

[0051] The present invention can accurately measure the deviation value on each circumference of the inner hole of the second measured workpiece through the combination of the spring expansion sleeve, the mandrel and the dial indicator, so as to calculate the out-of-roundness and coaxiality. This high-precision measurement helps to improve product quality and performance. The control unit is connected to the detection module, and can control the detection module in real time to detect the coaxiality of the first measured workpiece and the second measured workpiece. This makes it possible to timely discover and solve the coaxiality problem in the production process and avoid the production of defective products. After the acquisition unit obtains the detection data of the dial indicator, the processing unit will pre-process the data to eliminate noise and interference, and improve the accuracy and reliability of the data. This helps to ensure the accuracy of the evaluation results. The evaluation unit automatically calculates the out-of-roundness and coaxiality of each circumference based on the processed detection data, and realizes the automatic evaluation of the coaxiality of the first measured workpiece and the second measured workpiece. This greatly improves the evaluation efficiency and reduces labor costs. The evaluation system is suitable for the coaxiality evaluation of various cylindrical surface parts, such as bearings, gears, shaft parts, etc. It has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0053] Figure 1 is a functional block diagram of a system for evaluating the coaxiality of a cylindrical surface according to the present invention;

[0054] Figure 2 It is a structural schematic diagram of the detection module of the present invention;

[0055] Figure 3 It is a flow chart of a method for evaluating the coaxiality of a cylindrical surface according to the present invention.

[0056] Among them, 1. the first workpiece to be measured; 2. the second workpiece to be measured; 3. the spring sleeve; 4. the core shaft; 5. the dial indicator; 6. the bearing; 7. the connecting block; 8. the bracket. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] like Figure 1-Figure 2 As shown, the present invention provides an evaluation system for the coaxiality of a cylindrical surface, comprising:

[0062] The detection module includes a spring expansion sleeve 3, a mandrel 4 and a dial indicator 5. The spring expansion sleeve 3 is installed in the first workpiece 1 to be measured. The mandrel 4 is coaxially arranged with the spring expansion sleeve 3. The dial indicator 5 is installed at the end of the mandrel 4. The probe of the dial indicator 5 contacts the side wall of the inner hole of the second workpiece 2 to be measured. The second workpiece 2 to be measured is connected to the first workpiece 1 to be measured.

[0063] An evaluation module, comprising a control unit, a collection unit, a processing unit and an evaluation unit;

[0064] The control unit is connected to the detection module, and the control unit is used to control the detection module to detect the coaxiality of the first workpiece 1 and the second workpiece 2;

[0065] The acquisition unit is connected to the dial gauge 5, and is used to obtain the detection data of the dial gauge 5 when the detection module performs detection, and the detection data includes the detection data of several circumferences of the inner hole of the second workpiece 2 to be detected;

[0066] The processing unit is connected to the acquisition unit, and the processing unit is used to pre-process the detection data, determine the deviation value of the circumferential point on each circumference of the inner hole of the second measured workpiece 2 according to the pre-processed detection data, and determine the out-of-roundness of each circumference according to the deviation value;

[0067] The evaluation unit is connected to the processing unit, and is used to determine the coaxiality of the first measured workpiece 1 and the second measured workpiece 2 according to the out-of-roundness of each circle.

[0068] In some embodiments of the present application, a bearing 6 is installed at the end of the mandrel 4, a connecting block 7 is provided on the side of the bearing 6, a bracket 8 is provided on the connecting block 7, a dial gauge 5 is installed on the bracket 8, and a probe of the dial gauge 5 is perpendicular to the axis of the second workpiece 2 to be measured;

[0069] The bearing 6 is connected to a control unit, and the control unit is used to control the bearing 6 to rotate at a constant speed, so as to drive the dial indicator 5 to detect the inner hole of the second workpiece 2 to be measured.

[0070] In this embodiment, by installing the dial indicator 5 on the bracket 8 and making its probe perpendicular to the axis of the second workpiece 2 to be measured, the stability and accuracy of the measurement process are ensured, thereby improving the measurement accuracy. The connection between the control unit and the bearing 6 realizes the precise control of the uniform rotation of the bearing 6, thereby driving the dial indicator 5 to automatically detect the inner hole of the second workpiece 2 to be measured, reducing the error and labor intensity of manual operation and improving the detection efficiency. The compact design of the components such as the mandrel 4, the bearing 6, the connecting block 7, the bracket 8 and the dial indicator 5 makes the entire detection device compact, easy to install and carry, and simple to operate and easy to use.

[0071] In some embodiments of the present application, preprocessing includes normalization, demarcating time intervals, and determining sampling time points.

[0072] In some embodiments of the present application, when the processing unit is used to determine the deviation value of each circumferential point on the circumference of the inner hole of the second measured workpiece according to the preprocessed detection data, it includes:

[0073] Set the detection data at the initial time point as calibration data;

[0074] Determine the detection difference between each detection data and the calibration data, and determine the deviation value of the circumferential point according to the detection difference and the time interval;

[0075] The deviation value is determined according to the following formula:

[0076]

[0077] Among them, P ij represents the deviation value of the jth circumference point of the i-th circle, C ij represents the detection data of the jth circumference point of the i-th circle, Ci0 represents the calibration data of the i-th circle, and Δt represents the sampling time interval.

[0078] In this embodiment, by setting calibration data and calculating the detection difference, and then combining the time interval to determine the deviation value of the circumferential point, this method can more accurately reflect the actual deviation of the inner hole of the measured workpiece, avoiding the error accumulation problem that may exist in the traditional method. This technical solution can efficiently process a large amount of detection data, quickly calculate the deviation value of each circumferential point on the circumference, and improve the efficiency and accuracy of data processing.

[0079] In some embodiments of the present application, when the processing unit is used to determine the out-of-roundness of each circle according to the deviation value, the out-of-roundness is determined according to the following formula:

[0080]

[0081] Among them, E i represents the out-of-roundness of the i-th circle, and m represents the number of circumferential points on the i-th circle.

[0082] In some embodiments of the present application, when the evaluation unit is used to determine the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circumference, it includes: determining the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the circumference according to the out-of-roundness of each circumference; comparing the initial coaxialities, determining the maximum value of the initial coaxialities, and setting the maximum value as the coaxiality of the first measured workpiece and the second measured workpiece;

[0083] The initial coaxiality is determined according to the following formula:

[0084] Ai=a×E i ;

[0085] Wherein, Ai represents the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the i-th circle, and a represents the influence coefficient.

[0086] In this embodiment, by determining the out-of-roundness of each circle and calculating the initial coaxiality of the first workpiece to be measured and the second workpiece to be measured, and then determining the maximum value as the coaxiality between the two, this method effectively improves the accuracy of coaxiality measurement and reduces the errors that may be caused by traditional methods. The out-of-roundness and initial coaxiality are calculated for each circle, ensuring the comprehensiveness of the evaluation, avoiding the influence of a single data point or a local area on the overall evaluation result, and making the evaluation result more objective and accurate.

[0087] like Figure 3 As shown, the present invention also discloses a method for evaluating the coaxiality of a cylindrical surface, which is applied to the above-mentioned system for evaluating the coaxiality of a cylindrical surface, and comprises:

[0088] Controlling the detection module to detect the coaxiality of the first workpiece to be measured and the second workpiece to be measured;

[0089] When the detection module performs detection, the detection data of the dial gauge 5 is obtained, and the detection data includes detection data of several circumferences of the inner hole of the second workpiece to be detected;

[0090] Preprocessing the detection data, determining the deviation value of the circumferential point on each circumference of the inner hole of the second workpiece to be detected according to the preprocessed detection data, and determining the out-of-roundness of each circumference according to the deviation value;

[0091] The coaxiality of the first workpiece to be measured and the second workpiece to be measured is determined according to the out-of-roundness of each circle.

[0092] This application controls the detection module and obtains detailed detection data of multiple circumferences of the inner hole of the second workpiece to be measured, which can more accurately reflect the shape characteristics of the workpiece to be measured, thereby more accurately evaluating the coaxiality of the cylindrical surface. After preprocessing the detection data, not only the deviation value of the circumferential point on each circumference is calculated, but also the out-of-roundness of each circumference is further determined. This comprehensive evaluation method can more comprehensively reflect the actual situation of coaxiality. The automated detection and data processing process reduces the reliance on manual operation and improves the evaluation efficiency, so that results can be obtained faster in large-scale or high-frequency evaluation tasks.

[0093] In some embodiments of the present application, the detection data is preprocessed, and the deviation value of the circumferential point on each circumference of the inner hole of the second detected workpiece is determined according to the preprocessed detection data, including: the preprocessing includes normalization processing, delimiting time intervals and determining sampling time points; setting the detection data at the initial time point as calibration data; determining the detection difference between each detection data and the calibration data, and determining the deviation value of the circumferential point according to the detection difference and the time interval;

[0094] The deviation value is determined according to the following formula:

[0095]

[0096] Among them, P ij represents the deviation value of the jth circumference point of the i-th circle, C ij represents the detection data of the jth circumference point of the i-th circle, C i0 represents the calibration data of the i-th circle, and Δt represents the sampling time interval.

[0097] In this embodiment, when performing precision workpiece detection, for each circumferential point on the inner hole of the second workpiece to be measured, a series of preprocessing steps are first performed on the detected data to ensure the accuracy of the data and the reliability of subsequent analysis. These preprocessing measures mainly include three aspects: normalization, time interval setting, and specific sampling time point determination. Normalization is to eliminate the systematic errors that may exist between different measurement batches or devices, so that all data are on the same comparable scale. Time intervals are set to clarify the frequency and accuracy of data acquisition and ensure that the data at each time point can accurately reflect the physical state at that time. The sampling time point is determined based on the detection requirements and the setting of the time interval to accurately select the key time point for subsequent analysis. Next, the detection data at the initial time point is set as calibration data. This step is crucial because the calibration data will be used as the benchmark for the subsequent calculation of the deviation value, and its accuracy and representativeness directly affect the reliability of the final result. Subsequently, the detection difference between each detection data and the calibration data is calculated one by one. This step quantifies the degree of deviation of each point relative to the benchmark state by comparing the actual detection value at each time point with the benchmark value. Finally, the deviation value of the circumferential point is determined based on the detection difference and the time interval.

[0098] In some embodiments of the present application, the out-of-roundness is determined according to the following formula:

[0099]

[0100] Among them, E i represents the out-of-roundness of the i-th circle, and m represents the number of circumferential points on the i-th circle.

[0101] In some embodiments of the present application, determining the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circumference includes: determining the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the circumference according to the out-of-roundness of each circumference; comparing the initial coaxialities to determine the maximum value of the initial coaxialities, and setting the maximum value as the coaxiality of the first measured workpiece and the second measured workpiece;

[0102] The initial coaxiality is determined according to the following formula:

[0103] Ai=a×E i ;

[0104] Wherein, Ai represents the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the i-th circle, and a represents the influence coefficient.

[0105] In this embodiment, in order to evaluate the coaxiality of the first measured workpiece and the second measured workpiece, it is first necessary to calculate based on the out-of-roundness of each circumference. This process involves the following key steps: First, for each circumference, the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the circumference is determined based on the measured value of its out-of-roundness. The out-of-roundness here refers to the degree of deviation between the actual shape of the circumference and its ideal circle. The calculation of the initial coaxiality depends on a specific formula, namely: Ai = a × Ei, where Ai represents the initial coaxiality corresponding to the i-th circumference, a is an influence coefficient, which may include the influence of various factors such as measurement error, workpiece material, etc., and Ei is the out-of-roundness measurement value of the i-th circumference. Then, it is necessary to compare all these initial coaxialities to find the maximum value. This maximum value is set as the overall coaxiality of the first measured workpiece and the second measured workpiece in the subsequent steps. Such a setting is based on a reasonable assumption: among multiple circumferences, the part with the worst coaxiality (i.e., the part with the largest initial coaxiality) will determine the coaxiality performance of the entire workpiece.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

[0107] The system provided in the above embodiment is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be decomposed or combined. For example, the modules in the above embodiment can be combined into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not regarded as improper limitations of the present invention.

[0108] Those skilled in the art should be able to appreciate that the modules and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two, and the programs corresponding to the software modules and method steps can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs or any other form of storage medium known in the technical field. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

Claims

1. A system for evaluating the coaxiality of a cylindrical surface, characterized in that: include: The detection module includes a spring expansion sleeve, a mandrel and a dial indicator, wherein the spring expansion sleeve is installed in a first workpiece to be measured, the mandrel is coaxially arranged with the spring expansion sleeve, the dial indicator is installed at the end of the mandrel, the probe of the dial indicator contacts the side wall of the inner hole of the second workpiece to be measured, and the second workpiece to be measured is connected to the first workpiece to be measured; An evaluation module, comprising a control unit, a collection unit, a processing unit and an evaluation unit; The control unit is connected to the detection module, and the control unit is used to control the detection module to detect the coaxiality of the first workpiece to be measured and the second workpiece to be measured; The acquisition unit is connected to the dial gauge, and is used to obtain detection data of the dial gauge when the detection module performs detection, and the detection data includes detection data of several circumferences of the inner hole of the second workpiece to be detected; The processing unit is connected to the acquisition unit, and is used to pre-process the detection data, determine the deviation value of the circumferential point on each circumference of the inner hole of the second measured workpiece according to the pre-processed detection data, and determine the out-of-roundness of each circumference according to the deviation value; The evaluation unit is connected to the processing unit, and is used to determine the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circumference.

2. The system for evaluating the coaxiality of cylindrical surfaces according to claim 1, characterized in that: A bearing is installed at the end of the mandrel, a connecting block is provided on the side of the bearing, a bracket is provided on the connecting block, the dial gauge is installed on the bracket, and the probe of the dial gauge is perpendicular to the axis of the second workpiece to be measured; The bearing is connected to the control unit, and the control unit is used to control the bearing to rotate at a constant speed to drive the dial indicator to detect the inner hole of the second workpiece to be measured.

3. The system for evaluating the coaxiality of cylindrical surfaces according to claim 2, characterized in that: The preprocessing includes normalization, time interval demarcation and sampling time point determination.

4. The system for evaluating the coaxiality of cylindrical surfaces according to claim 3, characterized in that: The processing unit, when used to determine the deviation value of each circumferential point on the circumference of the inner hole of the second measured workpiece according to the preprocessed detection data, includes: Set the detection data at the initial time point as calibration data; Determine a detection difference between each detection data and the calibration data, and determine a deviation value of a circumferential point according to the detection difference and the time interval; The deviation value is determined according to the following formula: Among them, P ij represents the deviation value of the jth circumference point of the i-th circle, C ij represents the detection data of the jth circumference point of the i-th circle, C i0 represents the calibration data of the i-th circle, and Δt represents the sampling time interval.

5. The system for evaluating the coaxiality of cylindrical surfaces according to claim 4, characterized in that: When the processing unit is used to determine the out-of-roundness of each circle according to the deviation value, the out-of-roundness is determined according to the following formula: Among them, E i represents the out-of-roundness of the i-th circle, and m represents the number of circumferential points on the i-th circle.

6. The system for evaluating the coaxiality of cylindrical surfaces according to claim 5, characterized in that: The evaluation unit, when used to determine the coaxiality of the first measured workpiece and the second measured workpiece according to the out-of-roundness of each circumference, comprises: Determine the initial coaxiality of the first workpiece to be measured and the second workpiece to be measured corresponding to the circumference according to the out-of-roundness of each circumference; Comparing the initial coaxiality, determining the maximum value of the initial coaxiality, and setting the maximum value as the coaxiality of the first measured workpiece and the second measured workpiece; The initial coaxiality is determined according to the following formula: Ai=a×E i ; Wherein, Ai represents the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the i-th circle, and a represents the influence coefficient.

7. A method for evaluating the coaxiality of a cylindrical surface, applied to the system for evaluating the coaxiality of a cylindrical surface as claimed in any one of claims 1 to 6, characterized in that: include: Controlling the detection module to detect the coaxiality of the first workpiece to be measured and the second workpiece to be measured; When the detection module performs detection, the detection data of the dial indicator is obtained, and the detection data includes detection data of several circumferences of the inner hole of the second workpiece to be detected; Preprocessing the detection data, determining the deviation value of the circumferential point on each circumference of the inner hole of the second measured workpiece according to the preprocessed detection data, and determining the out-of-roundness of each circumference according to the deviation value; The coaxiality of the first workpiece to be measured and the second workpiece to be measured is determined according to the out-of-roundness of each circle.

8. The method for evaluating the coaxiality of a cylindrical surface according to claim 7, characterized in that: Preprocessing the detection data, and determining the deviation value of each circumferential point on the circumference of the inner hole of the second detected workpiece according to the preprocessed detection data, including: The preprocessing includes normalization processing, delimiting time intervals and determining sampling time points; Set the detection data at the initial time point as calibration data; Determine a detection difference between each detection data and the calibration data, and determine a deviation value of a circumferential point according to the detection difference and the time interval; The deviation value is determined according to the following formula: Among them, P ij represents the deviation value of the jth circumference point of the i-th circle, C ij represents the detection data of the jth circumference point of the i-th circle, C i0 represents the calibration data of the i-th circle, and Δt represents the sampling time interval.

9. The method for evaluating the coaxiality of a cylindrical surface according to claim 8, characterized in that: The out-of-roundness is determined according to the following formula: Among them, E i represents the out-of-roundness of the i-th circle, and m represents the number of circumferential points on the i-th circle.

10. The method for evaluating the coaxiality of a cylindrical surface according to claim 9, characterized in that: Determining the coaxiality of the first workpiece to be measured and the second workpiece to be measured according to the out-of-roundness of each circle includes: Determine the initial coaxiality of the first workpiece to be measured and the second workpiece to be measured corresponding to the circumference according to the out-of-roundness of each circumference; Comparing the initial coaxiality, determining the maximum value of the initial coaxiality, and setting the maximum value as the coaxiality of the first measured workpiece and the second measured workpiece; The initial coaxiality is determined according to the following formula: Ai=a×E i ; Wherein, Ai represents the initial coaxiality of the first measured workpiece and the second measured workpiece corresponding to the i-th circle, and a represents the influence coefficient.

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