A control method for a grinding production line of high-precision ceramic balls for new energy vehicles

Abstract

The present invention relates to the technical field of ceramic ball processing, and particularly to a control method for a grinding production line of high-precision ceramic balls for new energy vehicles, including: obtaining the distribution state of a number of ceramic balls in a grinding groove to determine whether the fine grinding process of the ceramic balls is qualified; under the condition that the fine grinding process of the ceramic balls is determined to be unqualified, collecting the grinding fluid in the fine grinding process and processing the grinding fluid to obtain grinding chips, constructing a particle size histogram and determining the normal fitting degree, and determining the qualification of the particle size distribution according to the normal fitting degree; under the condition that the particle size distribution is determined to be unqualified, adjusting the grinding speed in the rough grinding process, the abrasive grain size in the fine grinding process or the polishing pressure in the polishing process; or, under the condition that the particle size distribution is determined to be qualified, obtaining the precision characterization parameters of the ceramic balls at the end of fine grinding to adjust the preset fitting degree according to the condition of unqualified fine grinding precision. The present invention improves the processing efficiency of ceramic balls.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic ball processing, and in particular to a grinding production line control method for high-precision ceramic balls for new energy vehicles. Background Art

[0002] In the field of new energy vehicles, high-precision ceramic balls (such as silicon nitride and zirconium oxide) are the core components of motor bearings. Their geometric accuracy, surface quality and mechanical properties directly affect the energy efficiency and reliability of the motor. There are significant bottlenecks in the quality control of traditional ceramic ball grinding production lines: First, the existing technology mainly relies on post-offline detection (such as random inspection by three-coordinate measuring machines) to determine the processing process of ceramic balls. The detection has strong lag and it is difficult to feedback processing defects in real time, resulting in a high risk of batch scrap and the inability to accurately trace the root cause of the defects; secondly, each link of the production line is mostly controlled independently, lacking a cross-process coordinated control mechanism. For example, when the roundness of the ceramic ball is detected to be out of tolerance during the grinding stage, it is difficult to adjust the front-end process or the back-end process in a coordinated manner, resulting in low process optimization efficiency; thirdly, the dynamic state monitoring of the ceramic ball during the processing process is insufficient, especially in the V-groove positioning link of the grinding station. The existing technology mostly uses mechanical fixation or a single optical sensor, which cannot make real-time judgment on whether the grinding force distribution is uniform, which is easy to cause local over-grinding or micro-cracks.

[0003] Therefore, there is an urgent need for a multi-level collaborative control method based on real-time state perception, which can dynamically determine the processing quality through the distribution characteristics of the ceramic balls in the V-grooves, and simultaneously feedback to the entire production line to form a full-process quality closed loop, thereby breaking through the industry pain points of detection lag, poor coordination and extensive regulation in existing technologies.

[0004] Chinese Patent Publication No.: CN101704208A discloses a high-precision ceramic ball high-efficiency grinding / polishing process, the process comprising the following steps: (1) rough grinding; (2) semi-finishing grinding; (3) fine grinding; (4) super-finishing; (5) polishing. In the steps (1)-(2), a double-disc self-rotating eccentric V-groove grinder is used, and in the steps (3)-(5), a double-disc self-rotating grinding disc grinder is used. The invention can achieve high processing accuracy and processing efficiency, and has the advantages of simple processing device structure and low manufacturing cost.

[0005] The following problems also exist in the prior art: in the prior art, the judgment of the ceramic ball grinding process mainly relies on post-offline detection, and each grinding process is mostly controlled independently, resulting in strong detection lag and inability to coordinate control across processes, resulting in a high risk of batch scrap of ceramic balls, thereby resulting in low processing efficiency of ceramic balls. Summary of the invention

[0006] To this end, the present invention provides a control method for a grinding production line of high-precision ceramic balls for new energy vehicles, so as to overcome the problems in the prior art that the detection has strong hysteresis and cannot perform coordinated control across processes, resulting in a relatively high risk of batch rejects of ceramic balls and thus low processing efficiency of ceramic balls.

[0007] To achieve the above object, the present invention provides a control method for a grinding production line of high-precision ceramic balls for new energy vehicles, including:

[0008] Obtain the distribution state of a number of ceramic balls in the grinding tank, so as to determine whether the fine grinding process of the ceramic balls is qualified based on the distribution state;

[0009] Under the condition that it is determined that the fine grinding process of the ceramic balls is unqualified, collect the grinding fluid in the fine grinding process and process the grinding fluid to obtain grinding debris;

[0010] Construct a particle size histogram according to the particle size distribution of the grinding debris and determine the normal fitting degree based on the particle size histogram, so as to determine the qualification of the particle size distribution of the grinding debris according to the comparison result between the normal fitting degree and the preset fitting degree;

[0011] Under the condition that it is determined that the particle size distribution of the grinding debris is unqualified, adjust the grinding speed in the rough grinding process, the abrasive grain size in the fine grinding process or the polishing pressure in the polishing process;

[0012] Or, under the condition that it is determined that the particle size distribution of the grinding debris is qualified, obtain the precision characterization parameters of the ceramic balls at the end of fine grinding, and determine the qualification of the fine grinding precision of the ceramic balls based on the precision characterization parameters, so as to adjust the preset fitting degree according to the condition of unqualified fine grinding precision.

[0013] Further, the process of determining the distribution state of the ceramic balls in the grinding tank includes:

[0014] Obtain the distribution image of the ceramic balls in the grinding tank to determine the spacing between adjacent ceramic balls;

[0015] Statistically calculate the spacing variance of all the spacings and compare the spacing variance with the preset variance;

[0016] If the spacing variance is greater than the preset variance, it is determined that the distribution state of the ceramic balls in the grinding tank is non-uniform distribution;

[0017] If the spacing variance is less than or equal to the preset variance, it is determined that the distribution state of the ceramic balls in the grinding tank is uniform distribution.

[0018] Further, the process of determining whether the fine grinding process of the ceramic balls is qualified based on the distribution state includes:

[0019] Determine the distribution state of the ceramic balls in the grinding tank;

[0020] If the distribution state of the ceramic balls is uniform, it is determined that the fine grinding process of the ceramic balls is qualified;

[0021] If the distribution state of the ceramic balls is non-uniform, it is determined that the fine grinding process of the ceramic balls is unqualified.

[0022] Further, the process of determining the normal fitting degree includes:

[0023] Determine the midpoint of the upper end line of any rectangular bar in the particle size histogram, and mark the values corresponding to each of the midpoints on the standard particle size distribution curve;

[0024] Construct a standard histogram based on the markings, and overlap the standard histogram with the particle size histogram;

[0025] Respectively count the first area of the overlapping part and the second area of the standard histogram, and determine the percentage of the first area to the second area as the normal fitting degree.

[0026] Further, the process of determining whether the particle size distribution of the abrasive debris is qualified includes:

[0027] Compare the normal fitting degree with the preset fitting degree;

[0028] If the normal fitting degree is greater than or equal to the preset fitting degree, it is determined that the particle size distribution of the abrasive debris is qualified;

[0029] If the normal fitting degree is less than the preset fitting degree, it is determined that the particle size distribution of the abrasive debris is unqualified.

[0030] Further, under the condition that the particle size of the abrasive debris is unqualified, the process of determining the adjustment parameters of the grinding production line of the ceramic balls includes:

[0031] Compare the particle size of the abrasive debris with a first particle size and a second particle size respectively;

[0032] Count the first proportion of the abrasive debris with a particle size less than the first particle size, and the second proportion of the abrasive debris with a particle size greater than the second particle size;

[0033] Compare the first proportion and the second proportion with a preset proportion respectively;

[0034] Set a number of adjustment parameters corresponding to the respective comparison results;

[0035] Detect the abrasive grain size of the fine grinding process based on the number of adjustment parameters, reduce the grinding speed of the rough grinding process of the ceramic balls, or reduce the polishing pressure of the polishing process of the ceramic balls.

[0036] Further, subtract the second ratio from the preset ratio to obtain a corresponding difference value;

[0037] Set the corresponding relationship between the difference value and reducing the grinding speed to adjust the grinding speed.

[0038] Further, the process of adjusting the polishing pressure during the polishing process of the ceramic ball includes:

[0039] Subtract the first ratio from the preset ratio to obtain a corresponding difference value;

[0040] Set the corresponding relationship between the difference value and reducing the polishing pressure to adjust the polishing pressure.

[0041] Further, under the condition of determining that the fine grinding accuracy of the ceramic ball is unqualified, the process of adjusting the preset fitting degree includes:

[0042] Subtract the preset parameter from the accuracy characterization parameter to obtain an accuracy difference value;

[0043] Set a number of adjustment coefficients corresponding to the accuracy difference value;

[0044] Increase the preset fitting degree based on a number of the adjustment coefficients.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention calculates the spacing variance by obtaining the distribution image of the ceramic balls in the grinding groove in real time, and determines whether the distribution state of the ceramic balls is a uniform distribution according to the spacing variance. When the processing states of the individual ceramic balls are relatively consistent, the spacing of the ceramic balls is relatively stable, the spacing variance is small, which is manifested as the ceramic balls being evenly distributed. When the processing states of the ceramic balls deviate, the spacing will fluctuate greatly, the spacing variance is large, indicating that the ceramic balls are unevenly distributed. Therefore, the qualification of the fine grinding process of the ceramic balls can be initially determined according to the distribution state of the ceramic balls; under the condition of initially determining that the fine grinding process is unqualified, further obtain the particle size distribution of the grinding debris, establish a particle size histogram to determine the normal fitting degree, and quantitatively analyze the particle size distribution of the grinding debris, solving the problem of the lag of traditional post-offline detection; at the same time, based on the dual judgments of the qualification of the grinding debris particle size distribution and the accuracy characterization parameter, the system can dynamically trigger the multi-process linkage adjustment of the rough grinding pressure, the fine grinding abrasive particle size or the polishing pressure, forming a "detection - analysis - feedback - optimization" closed-loop control, significantly reducing the risk of batch rejects caused by the out-of-control of a single process, thereby improving the processing efficiency of the ceramic balls.

[0046] Further, by constructing a histogram of the abrasive particle size and comparing it with a standard histogram to determine whether the particle size distribution of the abrasive particles is qualified, when the processing process of the ceramic balls is qualified, the particle size distribution of the abrasive particles approximates the shape of a normal distribution curve. A standard histogram is reconstructed based on the standard particle size distribution curve, and the standard histogram is overlapped with the particle size histogram. The size of the overlapping area represents the size of the abrasive particle size and the proportion of the particle size within the same range and the fitting degree with the standard particle size distribution curve, thereby accurately determining the particle size distribution of the abrasive particles, further determining whether the processing process of the ceramic balls is qualified, and adaptively adjusting the process parameters according to the determination result, avoiding the blindness of traditional manual experience parameter adjustment, reducing the scrap rate, and at the same time improving the matching accuracy of cross-process parameters, thereby further improving the processing efficiency of the ceramic balls.

[0047] Further, when the abnormal particle size distribution of the abrasive particles of the ceramic balls is detected, the adjustment parameters are determined according to the statistical results of the abrasive particles with smaller particle sizes and larger particle sizes. If there are more abrasive particles with smaller particle sizes and larger particle sizes, it indicates that the abrasive particle size distribution in the fine grinding process is uneven. Therefore, it is necessary to detect the abrasive particle size and determine the adjustment of the abrasive particle size according to the detection result; more abrasive particles with smaller particle sizes will cause uneven dispersion in the grinding fluid and adhere to the surface of the ceramic balls, increasing the surface roughness of the ceramic balls and reducing their surface finish. At the same time, the abrasive particles staying for a long time may also scratch the surface of the ceramic balls, further deteriorating the surface quality and thus affecting the processing accuracy. Therefore, it is necessary to reduce the polishing pressure during the polishing process to reduce the surface roughness and improve the processing accuracy of the ceramic balls; more abrasive particles with larger particle sizes are due to excessive cutting and breakage on the surface of the ceramic balls caused by too high grinding speed during the rough grinding process, resulting in a large number of abrasive particles with large particle sizes during the fine grinding process; according to the difference between the particle size proportion and the preset threshold, the grinding speed, abrasive particle size or polishing pressure is adjusted differentially, and the dynamic balance of the process parameters is achieved through data driving, so that the compliance rate of processing consistency is improved, thereby further improving the processing efficiency of the ceramic balls.

[0048] Further, under the condition that the particle size distribution of the abrasive particles is determined to be qualified, the overall quality of the ceramic balls is evaluated to finally determine whether the fine grinding accuracy of the ceramic balls is qualified, and for the case where the fine grinding accuracy is unqualified, the judgment criterion for the qualification of the abrasive particle size distribution is improved. Based on the feedback optimization mechanism of the final inspection data, the problem of "disconnection between detection and process" caused by the parameter solidification of the traditional production line is broken through, enabling the system to have self-learning ability and reducing the fluctuation range of the scrap rate during long-term operation, thereby further improving the processing efficiency of the ceramic balls. Description of the Drawings

[0049] Figure 1 It is a flowchart of the control method for the grinding production line of high-precision ceramic balls for new energy vehicles according to an embodiment of the present invention;

[0050] Figure 2 Flow chart for determining whether the fine grinding process of ceramic balls is qualified in the embodiments of the present invention;

[0051] Figure 3 Flow chart for determining whether the particle size distribution of the grinding debris is qualified in the embodiments of the present invention;

[0052] Figure 4 Flow chart for adjusting the grinding speed of ceramic balls in the embodiments of the present invention. Detailed implementation manners

[0053] In order to make the objectives and advantages of the present invention clearer and more understandable, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0055] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0056] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] Please refer to Figures 1 - 4 as shown Figure 1 Flow chart of the control method for the grinding production line of high-precision ceramic balls for new energy vehicles in the embodiments of the present invention; Figure 2 Flow chart for determining whether the fine grinding process of ceramic balls is qualified in the embodiments of the present invention; Figure 3 Flow chart for determining whether the particle size distribution of the grinding debris is qualified in the embodiments of the present invention; Figure 4 Flow chart for adjusting the grinding speed of ceramic balls in the embodiments of the present invention.

[0058] An embodiment of the present invention provides a control method for a grinding production line of high-precision ceramic balls for new energy vehicles, including:

[0059] Step S1, obtaining the distribution state of a plurality of ceramic balls in the grinding tank, and determining whether the fine grinding process of the ceramic balls is qualified based on the distribution state;

[0060] Step S2, under the condition that the fine grinding process of the ceramic balls is determined to be unqualified, collecting the grinding fluid in the fine grinding process and processing the grinding fluid to obtain grinding debris;

[0061] Step S3, constructing a particle size histogram according to the particle size distribution of the grinding debris and determining the normal fitting degree based on the particle size histogram, and determining the qualification of the particle size distribution of the grinding debris according to the comparison result between the normal fitting degree and the preset fitting degree;

[0062] Step S4, under the condition that the particle size distribution of the grinding debris is determined to be unqualified, adjusting the grinding speed in the rough grinding process, the abrasive grain size in the fine grinding process, or the polishing pressure in the polishing process;

[0063] Step S5, or, under the condition that the particle size distribution of the grinding debris is determined to be qualified, obtaining the precision characterization parameters of the ceramic balls at the end of fine grinding, and determining the qualification of the fine grinding precision of the ceramic balls based on the precision characterization parameters, and adjusting the preset fitting degree according to the condition that the fine grinding precision is unqualified.

[0064] Specifically, the grinding production line of the ceramic balls includes blank trimming, rough grinding, fine grinding, and polishing. The blank trimming process uses a blank trimming grinding machine, the rough grinding process uses a rough grinding grinding machine, the fine grinding process uses a fine grinding grinding machine with a V-shaped groove, and several circles of V-shaped grooves are arranged concentrically on the lower grinding disc, and polishing uses a polishing grinding machine.

[0065] It is understandable that the present invention determines the distribution state of ceramic balls by the arrangement spacing of ceramic balls, and further determines whether the fine grinding process of ceramic balls is qualified according to the distribution state of ceramic balls. When the fine grinding process of ceramic balls is qualified, the state of each ceramic ball is consistent, ensuring that the spacing between ceramic balls remains the same during the fine grinding process as when entering the fine grinding program. When the spacing variance of ceramic balls is relatively large, it indicates that the processing state of ceramic balls has deviated and further determination is required; the grinding process of ceramic balls includes rough grinding, fine grinding and polishing. The rough grinding process is the grinding process in the initial stage of processing, aiming to remove surface protrusions and defects after processing, paying more attention to quickly removing materials and having relatively low requirements for surface finish. The polishing process is the final stage of the processing process, aiming to further remove micro-scratches and burrs generated during the fine grinding process, paying more attention to improving the gloss and fineness of the surface; the fine grinding process plays a connecting role in the processing of ceramic balls. It can not only improve the dimensional accuracy and surface finish of ceramic balls, but also create favorable conditions for the subsequent polishing process. If the quality of the fine grinding process cannot be guaranteed, it will be difficult for the polishing process to achieve the ideal effect. Therefore, the fine grinding process of ceramic balls is detected to determine the qualification of the fine grinding process, and the production process of the production line is adjusted according to the qualification of the fine grinding process to improve batch stability.

[0066] Specifically, the distribution state of ceramic balls in the grinding groove is obtained by scanning the grinding groove with a laser scanner.

[0067] Specifically, the process of obtaining grinding debris by treating the grinding fluid includes:

[0068] Using a magnetic separator to preliminarily remove large particle grinding debris in the grinding fluid;

[0069] Using centrifugal separation technology to further separate micro-particles from the preliminarily separated grinding fluid;

[0070] Drying the obtained grinding debris particles.

[0071] Specifically, various methods such as laser scattering method can be used to determine the particle size of the grinding debris particles, and no specific limitation is made.

[0072] Specifically, the process of determining the distribution state of ceramic balls in the grinding groove includes:

[0073] Obtaining the distribution image of ceramic balls in the grinding groove to determine the spacing between adjacent ceramic balls;

[0074] Statistical analysis of all the spacings to calculate the spacing variance, and comparing the spacing variance with a preset variance;

[0075] If the spacing variance is greater than the preset variance, it is determined that the distribution state of ceramic balls in the grinding groove is non-uniform distribution;

[0076] If the spacing variance is less than or equal to the preset variance, it is determined that the distribution state of the ceramic balls in the grinding groove is uniform distribution.

[0077] Specifically, the value range of the preset variance is set to [0.1, 3], and 1.2 is preferably selected in the embodiments of the present invention.

[0078] Specifically, the process of determining whether the fine grinding process of the ceramic balls is qualified based on the distribution state includes:

[0079] Determine the distribution state of the ceramic balls in the grinding groove;

[0080] If the distribution state of the ceramic balls is uniform distribution, it is determined that the fine grinding process of the ceramic balls is qualified;

[0081] If the distribution state of the ceramic balls is non-uniform distribution, it is determined that the fine grinding process of the ceramic balls is unqualified.

[0082] It can be understood that the uniform distribution state of the ceramic balls during the processing process fully reflects the consistency of the processing state of the ceramic balls and the high controllability of the process parameters. It not only reflects the stability of key processes such as raw material mixing, molding and sintering, but also directly ensures the quality stability between product batches. By precisely controlling the parameters of the processing process, the processing quality of each ceramic ball is highly consistent under the same processing conditions.

[0083] Specifically, the process of determining the normal fitting degree includes:

[0084] Determine the midpoint of the upper end line of any rectangular bar in the particle size histogram, and mark the corresponding values of each midpoint on the standard particle size distribution curve;

[0085] Construct a standard histogram based on the marks, and overlap the standard histogram with the particle size histogram;

[0086] Respectively count the first area of the overlapping part and the second area of the standard histogram, and determine the percentage of the first area to the second area as the normal fitting degree.

[0087] Specifically, the standard particle size distribution curve is the particle size distribution curve of the grinding chips with qualified processing accuracy and consistent with the accuracy requirements of the ceramic balls being processed.

[0088] Specifically, the process of determining whether the particle size distribution of the grinding chips is qualified includes:

[0089] Compare the normal fitting degree with the preset fitting degree;

[0090] If the normal fitting degree is greater than or equal to the preset fitting degree, it is determined that the particle size distribution of the grinding chips is qualified;

[0091] If the normal fitting degree is less than the preset fitting degree, it is determined that the particle size distribution of the wear debris is unqualified.

[0092] Specifically, the value range of the preset fitting degree is set to [60%, 80%], and 70% is preferably selected in the embodiments of the present invention.

[0093] Specifically, under the condition that the particle size of the wear debris is unqualified, the process of determining the adjustment parameters of the grinding production line of the ceramic ball includes:

[0094] Compare the particle size of the wear debris with the first particle size and the second particle size respectively;

[0095] Statistically analyze the first proportion of the wear debris with a particle size smaller than the first particle size and the second proportion of the wear debris with a particle size larger than the second particle size;

[0096] Compare the first proportion and the second proportion with the preset proportion respectively;

[0097] If the first proportion is greater than the preset proportion and the second proportion is greater than the preset proportion, it is determined to detect the abrasive grain size in the fine grinding process;

[0098] If the first proportion is less than or equal to the preset proportion and the second proportion is greater than the preset proportion, it is determined to reduce the grinding speed in the rough grinding process of the ceramic ball;

[0099] If the first proportion is greater than the preset proportion and the second proportion is less than or equal to the preset proportion, it is determined to reduce the polishing pressure in the polishing process of the ceramic ball.

[0100] Specifically, the value range of the first particle size is set to [0.5 μm, 2 μm], and 1 μm is preferably selected in the embodiments of the present invention; the value range of the second particle size is set to [1 μm, 4 μm], and 3 μm is preferably selected in the embodiments of the present invention; the value range of the preset proportion is set to [5%, 15%], and 10% is preferably selected in the embodiments of the present invention.

[0101] Specifically, the process of detecting the abrasive grain size is as follows:

[0102] Using the laser scattering principle, a laser particle size analyzer is used to determine the actual particle size distribution curve of the abrasive grain size and overlap it with the standard particle size distribution curve;

[0103] The percentage of the length of the overlapping part curve to the length of the standard particle size distribution curve is the actual characterization parameter of the abrasive grain size, and the actual characterization parameter is compared with the preset characterization parameter;

[0104] If the actual characterization parameter is greater than or equal to the preset characterization parameter, it is determined that the abrasive grain size is qualified;

[0105] If the actual characterization parameter is less than the preset characterization parameter, it is determined that the abrasive grain size is unqualified, and the abrasive needs to be replaced or repaired;

[0106] Among them, the standard grain size distribution curve is the grain size distribution curve of the abrasive before it is put into use.

[0107] Specifically, the value range of the preset characterization parameter is set to [80%, 95%], and 90% is preferred in the embodiments of the present invention.

[0108] Specifically, the process of adjusting the grinding speed during the rough grinding process of the ceramic ball includes:

[0109] Subtracting the second ratio from the preset ratio to obtain a corresponding difference;

[0110] Setting the corresponding relationship between the difference and reducing the grinding speed to adjust the grinding speed;

[0111] In a specific implementation, subtracting the second ratio from the preset ratio to obtain a first difference, and comparing the first difference with a preset difference;

[0112] If the first difference is greater than the preset difference, it is determined to reduce the grinding speed with a first speed adjustment coefficient;

[0113] If the first difference is less than or equal to the preset difference, it is determined to reduce the grinding speed with a second speed adjustment coefficient.

[0114] Specifically, the value range of the preset difference is set to [1%, 5%], and 3% is preferred in the embodiments of the present invention; the value range of the first speed adjustment coefficient is set to [0.85, 0.89], and 0.86 is preferred in the embodiments of the present invention; the value range of the second speed adjustment coefficient is set to [0.9, 0.93], and 0.91 is preferred in the embodiments of the present invention.

[0115] Specifically, the process of adjusting the polishing pressure during the polishing process of the ceramic ball includes:

[0116] Subtracting the first ratio from the preset ratio to obtain a corresponding difference;

[0117] Setting the corresponding relationship between the difference and reducing the polishing pressure to adjust the polishing pressure.

[0118] In a specific implementation, subtracting the first ratio from the preset ratio to obtain a second difference, and comparing the second difference with a preset difference;

[0119] If the second difference is greater than the preset difference, it is determined to reduce the polishing pressure with the first pressure adjustment coefficient;

[0120] If the second difference is less than or equal to the preset difference, it is determined to reduce the polishing pressure with the second pressure adjustment coefficient.

[0121] Specifically, the value range of the first pressure adjustment coefficient is set to [0.94, 0.96], and preferably 0.95 in the embodiments of the present invention; the value range of the second pressure adjustment coefficient is set to [0.97, 0.99], and preferably 0.98 in the embodiments of the present invention.

[0122] It can be understood that the corresponding difference includes the first difference and the second difference. The corresponding relationship with the first difference is to reduce the grinding speed with the first speed adjustment coefficient or the second speed adjustment coefficient, and the corresponding relationship with the second difference is to reduce the polishing pressure with the first pressure adjustment coefficient or the second pressure adjustment coefficient.

[0123] Specifically, the process of determining the qualification of the fine grinding accuracy of the ceramic ball based on the accuracy characterization parameter includes:

[0124] Compare the accuracy characterization parameter with the preset parameter;

[0125] If the accuracy characterization parameter is less than the preset parameter, it is determined that the fine grinding accuracy of the ceramic ball is unqualified;

[0126] If the accuracy characterization parameter is greater than or equal to the preset parameter, it is determined that the fine grinding accuracy of the ceramic ball is qualified.

[0127] Specifically, the sum of the product of the value o of the sphericity of the ceramic ball and its corresponding weight coefficient α and the product of the value r of the roughness of the ceramic ball and its corresponding weight coefficient β is equal to the accuracy characterization parameter E, and α = 0.5 and β = 0.5 are set. a The sum of the product of the value o of the sphericity of the ceramic ball and its corresponding weight coefficient α and the product of the value r of the roughness of the ceramic ball and its corresponding weight coefficient β is equal to the accuracy characterization parameter E, and α = 0.5 and β = 0.5 are set.

[0128] Specifically, the value range of the preset characterization parameter is set to [0.06, 0.09], and preferably 0.07 in the embodiments of the present invention.

[0129] Specifically, under the condition that it is determined that the fine grinding accuracy of the ceramic ball is unqualified, the adjustment process of the preset fitting degree includes:

[0130] Subtract the accuracy characterization parameter from the preset parameter to obtain an accuracy difference, and compare the accuracy difference with a preset accuracy difference;

[0131] If the accuracy difference is greater than the preset accuracy difference, it is determined to increase the preset fitting degree with the first correction coefficient;

[0132] If the precision difference is less than or equal to the preset precision difference, it is determined to increase the preset fitting degree with the second correction coefficient.

[0133] Specifically, the value range of the preset precision difference is set to [0.01, 0.03], and preferably 0.02 in the embodiments of the present invention; the value range of the first correction coefficient is set to [1.2, 1.4], and preferably 1.3 in the embodiments of the present invention; the value range of the second correction coefficient is set to [1.01, 1.19], and preferably 1.15 in the embodiments of the present invention.

[0134] It can be understood that in the embodiments of the present invention, the adjustment method of all adjustment coefficients for the corresponding adjustment parameters is that the product of the adjustment coefficient and the corresponding adjustment parameter is the adjusted adjustment parameter.

[0135] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles, characterized in that: include: Obtaining the distribution state of a plurality of ceramic balls in the grinding groove, so as to determine whether the fine grinding process of the ceramic balls is qualified based on the distribution state; Under the condition that the fine grinding process of the ceramic ball is determined to be unqualified, collecting the grinding fluid of the fine grinding process and treating the grinding fluid to obtain grinding chips; Constructing a particle size histogram according to the particle size distribution of the wear debris and determining a normal fit based on the particle size histogram, so as to determine the eligibility of the particle size distribution of the wear debris according to a comparison result between the normal fit and a preset fit; Under the condition that the particle size distribution of the grinding chips is determined to be unqualified, adjusting the grinding speed of the rough grinding process, the abrasive particle size of the fine grinding process or the polishing pressure of the polishing process; Or, under the condition that the particle size distribution of the grinding debris is determined to be qualified, the precision characterization parameters of the ceramic ball after fine grinding are obtained, and the qualification of the fine grinding precision of the ceramic ball is determined based on the precision characterization parameters, so as to adjust the preset fitting degree according to the condition that the fine grinding precision is unqualified; The precision characterization parameter is the product of the sphericity o of the ceramic ball and its corresponding weight coefficient α and the roughness r of the ceramic ball. a The sum of the products of the values ​​of and their corresponding weight coefficients β.

2. The grinding production line control method for high-precision ceramic balls for new energy vehicles according to claim 1 is characterized in that: The process of determining the distribution of ceramic balls in the grinding tank includes: Obtain the distribution image of the ceramic balls in the grinding tank to determine the spacing between adjacent ceramic balls; Counting all the intervals to calculate the interval variance, and comparing the interval variance with a preset variance; If the spacing variance is greater than the preset variance, it is determined that the distribution state of the ceramic balls in the grinding groove is non-uniform distribution; If the spacing variance is less than or equal to the preset variance, it is determined that the distribution state of the ceramic balls in the grinding groove is uniformly distributed.

3. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 2, characterized in that: The process of determining whether the fine grinding process of the ceramic balls is qualified based on the distribution state includes: If the distribution state of the ceramic balls is uniform, it is determined that the fine grinding process of the ceramic balls is qualified; If the distribution state of the ceramic balls is non-uniform, it is determined that the fine grinding process of the ceramic balls is unqualified.

4. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 3, characterized in that: The process of determining the normal fit includes: Determine the midpoint of the upper end line of any rectangular bar in the particle size histogram, and mark the value corresponding to each midpoint on the standard particle size distribution curve; constructing a standard histogram based on the markers, and overlapping the standard histogram with the particle size histogram; The first area of ​​the overlapping portion and the second area of ​​the standard histogram are counted respectively, and the percentage of the first area to the second area is determined as the normal fit.

5. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 4, characterized in that: The process of determining whether the particle size distribution of the wear debris is qualified includes: Comparing the normal goodness of fit with the preset goodness of fit; If the normal fitting degree is less than the preset fitting degree, it is determined that the particle size distribution of the wear debris is unqualified.

6. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 5, characterized in that: Under the condition that the particle size of the grinding chips is unqualified, the process of determining the adjustment parameters of the ceramic ball grinding production line includes: comparing the particle size of the wear debris with the first particle size and the second particle size; Counting a first proportion of the wear debris with a particle size smaller than the first particle size, and a second proportion of the wear debris with a particle size larger than the second particle size; Comparing the first proportion and the second proportion with a preset proportion respectively; Setting several adjustment parameters corresponding to the corresponding comparison results; Based on the several adjustment parameters, the abrasive grain size of the fine grinding process is detected, the grinding speed of the ceramic ball rough grinding process is reduced, or the polishing pressure of the ceramic ball polishing process is reduced.

7. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 6, characterized in that: The process of adjusting the grinding speed of the ceramic ball rough grinding process includes: Subtracting the second proportion from the preset proportion to obtain a corresponding difference; A corresponding relationship between the corresponding difference and the reduction of the grinding speed is set to adjust the grinding speed.

8. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 6, characterized in that: The process of adjusting the polishing pressure during the ceramic ball polishing process includes: Subtracting the first proportion from the preset proportion to obtain a corresponding difference; A corresponding relationship between the corresponding difference and the reduction of the polishing pressure is set to adjust the polishing pressure.

9. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 8, characterized in that: The process of determining the eligibility of fine grinding accuracy of ceramic balls based on accuracy characterization parameters includes: Comparing the accuracy characterization parameter with a preset parameter; If the precision characterization parameter is less than the preset parameter, it is determined that the fine grinding precision of the ceramic ball is unqualified.

10. The method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to claim 9, characterized in that: Under the condition that the fine grinding precision of the ceramic ball is determined to be unqualified, the process of adjusting the preset fitting degree includes: Subtracting the preset parameter from the accuracy characterization parameter to obtain an accuracy difference; Setting a number of adjustment coefficients corresponding to the accuracy difference; The preset degree of fit is increased based on a plurality of the adjustment coefficients.

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