Grinding production line control method for high-precision ceramic balls for new energy vehicles

Abstract

The invention relates to the technical field of ceramic ball machining, in particular to a grinding production line control method for high-precision ceramic balls for new energy automobiles, which comprises the following steps: acquiring the distribution state of a plurality of ceramic balls in a grinding groove to determine whether the fine grinding process of the ceramic balls is qualified or not; under the condition that it is determined that the fine grinding process of the ceramic ball is unqualified, grinding fluid in the fine grinding process is collected and treated to obtain abrasive dust, a particle size histogram is constructed, the normal fitting degree is determined, and the qualification of particle size distribution is determined according to the normal fitting degree; under the condition that the particle size distribution is determined to be unqualified, the grinding speed in the coarse grinding process, the abrasive particle size in the fine grinding process or the polishing pressure in the polishing process is adjusted; or, under the condition that the particle size distribution is determined to be qualified, the precision characterization parameters of the ceramic balls after fine grinding are obtained, and the preset fitting degree is adjusted according to the condition that the fine grinding precision is unqualified. The machining efficiency of the ceramic balls is improved.

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 method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles, so as to overcome the problem in the prior art that the detection hysteresis is strong and coordinated control cannot be performed across processes, resulting in a high risk of batch scrap of ceramic balls, thereby leading to low processing efficiency of ceramic balls.

[0007] To achieve the above object, the present invention provides a method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles, comprising: 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 chips is qualified, the accuracy characterization parameters of the ceramic balls after fine grinding are obtained, and the qualification of the fine grinding accuracy of the ceramic balls is determined based on the accuracy characterization parameters, so as to adjust the preset fitting degree according to the condition that the fine grinding accuracy is unqualified.

[0008] Furthermore, the process of determining the distribution state of the ceramic balls in the grinding groove 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.

[0009] Further, the process of determining whether the fine grinding process of the ceramic balls is qualified based on the distribution state includes: Determine the distribution of ceramic balls in the grinding tank; 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.

[0010] Furthermore, the process of determining the normal fit includes: Determine the midpoint of the upper end line of any rectangular bar in the particle size distribution 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 distribution 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.

[0011] Furthermore, 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 greater than or equal to the preset fitting degree, it is determined that the particle size distribution of the wear debris is qualified; 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.

[0012] Further, under the condition that the particle size of the grinding debris is unqualified, the process of determining the adjustment parameters of the grinding production line of the ceramic ball 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 grinding chips having a particle size smaller than the first particle size, and a second proportion of the ceramic balls having 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.

[0013] Further, 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.

[0014] Further, 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.

[0015] Further, 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.

[0016] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention calculates the spacing variance by acquiring 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 uniformly distributed according to the spacing variance. When the processing states of the ceramic balls are relatively consistent, the spacing of the ceramic balls is relatively stable, and the spacing variance is small, which shows that the ceramic balls are uniformly distributed. When the processing states of the ceramic balls deviate, the spacing will fluctuate greatly, and the spacing variance is large, which shows that the ceramic balls are non-uniformly distributed. Therefore, the eligibility of the fine grinding process of the ceramic balls can be preliminarily judged according to the distribution state of the ceramic balls. Under the condition that the fine grinding process is initially judged to be unqualified, the particle size distribution of the grinding chips is further obtained, and the particle size histogram is established to determine the normal fit. The quantitative analysis of the distribution of grinding chip particle size solves the lag problem of traditional post-offline detection. At the same time, based on the dual judgment of the qualification of the grinding chip particle size distribution and the precision characterization parameters, the system can dynamically trigger the multi-process linkage adjustment of the coarse grinding pressure, fine grinding abrasive particle size or polishing pressure, forming a "detection-analysis-feedback-optimization" closed-loop control, which significantly reduces the risk of batch scrap caused by loss of control of a single process, thereby improving the processing efficiency of ceramic balls.

[0017] Furthermore, by constructing a histogram of the particle size distribution of the wear chips and comparing it with the standard histogram, it is determined whether the particle size distribution of the wear chips is qualified. When the processing process of the ceramic ball is qualified, the particle size distribution of the wear chips is close to the shape of the normal distribution curve. The standard histogram is reconstructed according to the standard particle size distribution curve, and the standard histogram is overlapped with the particle size distribution histogram. The size of the overlapping area represents the size of the particle size of the wear chips and the proportion of the particle size in the same range and the degree of fit to the standard particle size distribution curve, thereby accurately determining the particle size distribution of the wear chips, further judging whether the processing process of the ceramic ball is qualified, and adaptively adjusting the process parameters according to the judgment results, avoiding the blindness of traditional manual experience parameter adjustment, reducing the scrap rate, and at the same time improving the accuracy of cross-process parameter matching, thereby further improving the processing efficiency of the ceramic ball.

[0018] Furthermore, when abnormal distribution of chip size of ceramic balls is detected, adjustment parameters are determined based on the statistical results of chip size with smaller particle size and chip size with larger particle size. Large number of chip size with smaller particle size and chip size with larger particle size indicates uneven distribution of abrasive particle size in fine grinding process, so it is necessary to detect abrasive particle size and adjust abrasive particle size based on the detection result. Large number of chip size with smaller particle size will lead to uneven dispersion in grinding liquid and adhere to the surface of ceramic balls, which will increase the roughness of the surface of ceramic balls and reduce its smoothness. At the same time, chip size that stays for a long time may scratch the surface of ceramic balls, which will cause scratches. The surface quality will be further deteriorated, thus affecting the processing accuracy. Therefore, it is necessary to reduce the polishing pressure in the polishing process to reduce the surface roughness and improve the processing accuracy of the ceramic ball. Larger particle size chips are mostly due to excessive cutting and damage on the surface of the ceramic ball due to excessive grinding speed during the rough grinding process, which results in a large amount of large particle size chips during the fine grinding process. According to the difference between the particle size ratio and the preset threshold, the grinding speed, abrasive particle size or polishing pressure are adjusted differentially, and the dynamic balance of process parameters is achieved through data-driven, which improves the processing consistency compliance rate and further improves the processing efficiency of the ceramic ball.

[0019] Furthermore, under the condition that the particle size distribution of the grinding chips is 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 in the case of unqualified fine grinding accuracy, the judgment basis for the qualified particle size distribution of grinding chips is improved. The feedback optimization mechanism based on the final inspection data has broken through the "detection-process disconnection" problem caused by the solidification of parameters of the traditional production line, enabling the system to have self-learning capabilities, and the fluctuation range of the scrap rate is reduced during long-term operation, thereby further improving the processing efficiency of the ceramic balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of a method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to an embodiment of the present invention; Figure 2 A flow chart of determining whether a fine grinding process of a ceramic ball is qualified according to an embodiment of the present invention; Figure 3 A flow chart for determining whether the particle size distribution of the wear debris is qualified according to an embodiment of the present invention; Figure 4 The present invention is a flow chart for adjusting the grinding speed of ceramic balls according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objects and advantages of the present invention more clearly understood, the present invention is 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.

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0023] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the 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. Therefore, it cannot be understood as a limitation on the present invention.

[0024] In addition, it should be noted that in the description of the present invention, 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1-Figure 4 As shown, Figure 1 This is a flow chart of a method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles according to an embodiment of the present invention; Figure 2 A flow chart of determining whether a fine grinding process of a ceramic ball is qualified according to an embodiment of the present invention; Figure 3 A flow chart for determining whether the particle size distribution of the wear debris is qualified according to an embodiment of the present invention; Figure 4 The present invention is a flow chart for adjusting the grinding speed of ceramic balls according to an embodiment of the present invention.

[0026] The embodiment of the present invention provides a method for controlling a grinding production line of high-precision ceramic balls for new energy vehicles, comprising: Step S1, obtaining the distribution state of a plurality 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; Step S2, under the condition that the fine grinding process of the ceramic ball is determined to be unqualified, collecting the grinding fluid in the fine grinding process and processing the grinding fluid to obtain grinding chips; Step S3, 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; Step S4, under the condition that it is determined that the particle size distribution of the grinding debris is 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; Step S5, or, under the condition that the particle size distribution of the grinding chips is determined to be qualified, the precision characterization parameters of the ceramic balls after fine grinding are obtained, and the qualification of the fine grinding precision of the ceramic balls 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.

[0027] Specifically, the grinding production line of ceramic balls includes trimming, rough grinding, fine grinding and polishing. The trimming process uses a trimming grinder, the rough grinding process uses a rough grinding grinder, the fine grinding process uses a fine grinding grinder with V-grooves, and several circles of V-grooves are arranged in concentric circles on the lower grinding disc. Polishing uses a polishing grinder.

[0028] It can be understood that the present invention determines the distribution state of the ceramic balls by the arrangement spacing of the ceramic balls, and further determines whether the fine grinding process of the ceramic balls is qualified according to the distribution state of the ceramic balls. Under the condition that the fine grinding process of the ceramic balls is qualified, the state of each ceramic ball is consistent, ensuring that the spacing of the ceramic balls during the fine grinding process is consistent with the spacing when entering the fine grinding program. When the variance of the spacing of the ceramic balls is large, it indicates that the processing state of the ceramic balls has deviated and further determination is required. The grinding process of the ceramic balls includes coarse grinding, fine grinding and polishing. The coarse grinding process is the grinding process in the initial stage of processing, which aims to remove surface protrusions and defects after processing, and pays more attention to the rapid removal of materials. The requirements for surface finish are relatively low. The polishing process is the final stage of the processing process, which aims to further remove the tiny scratches and burrs generated during the fine grinding process, and pays more attention to improving the gloss and fineness of the surface. The fine grinding process plays a connecting role in the ceramic ball processing process. It can not only improve the dimensional accuracy and surface finish of the ceramic balls, but also create favorable conditions for the subsequent polishing process. If the quality of the fine grinding process is not guaranteed, then the polishing process will be difficult to achieve the desired effect. Therefore, the fine grinding process of the ceramic balls is tested to determine the qualification of the fine grinding process, so as to adjust the production process of the production line according to the qualification of the fine grinding process to improve batch stability.

[0029] Specifically, the distribution state of the ceramic balls in the grinding groove is obtained by scanning the grinding groove with a laser scanner.

[0030] Specifically, the process of processing the grinding fluid to obtain grinding chips includes: The large particles of grinding debris in the grinding fluid are initially removed by using a magnetic separator; The grinding fluid that has undergone preliminary separation is further separated into tiny particles using centrifugal separation technology; The obtained wear debris particles are dried.

[0031] Specifically, the particle size of the wear debris particles may be determined by various methods such as laser scattering method, which is not specifically limited.

[0032] Specifically, the process of determining the distribution state 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.

[0033] Specifically, the value range of the preset variance is set to [0.1, 3], and 1.2 is preferred in the embodiment of the present invention.

[0034] Specifically, the process of determining whether the fine grinding process of the ceramic balls is qualified based on the distribution state includes: Determine the distribution of ceramic balls in the grinding tank; 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.

[0035] It is understandable that the ceramic balls are evenly distributed during the processing, which fully demonstrates 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 guarantees 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.

[0036] Specifically, the process of determining the normal fit includes: Determine the midpoint of the upper end line of any rectangular bar in the particle size distribution 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 distribution 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.

[0037] Specifically, the standard particle size distribution curve is a particle size distribution curve of wear chips with qualified processing accuracy and consistent with the accuracy requirements of the ceramic ball being processed.

[0038] Specifically, 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 greater than or equal to the preset fitting degree, it is determined that the particle size distribution of the wear debris is qualified; 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.

[0039] Specifically, the preset fitness value range is set to [60%, 80%], and 70% is preferred in the embodiment of the present invention.

[0040] Specifically, 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 grinding chips having a particle size smaller than the first particle size, and a second proportion of the ceramic balls having a particle size larger than the second particle size; Comparing the first proportion and the second proportion with a preset proportion respectively; 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 particle size in the fine grinding process; If the first proportion is less than or equal to the preset proportion and the second proportion is greater than the preset proportion, determining to reduce the grinding speed of the ceramic ball rough grinding process; 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 of the ceramic ball polishing process.

[0041] Specifically, the value range of the first particle size is set to [0.5μm, 2μm], and 1μm is preferred in the embodiment of the present invention; the value range of the second particle size is set to [1μm, 4μm], and 3μm is preferred in the embodiment of the present invention; the value range of the preset proportion is set to [5%, 15%], and 10% is preferred in the embodiment of the present invention.

[0042] Specifically, the process of detecting abrasive particle size is as follows: The actual particle size distribution curve of the abrasive particle size is determined by using a laser particle size analyzer based on the laser scattering principle and overlapped with the standard particle size distribution curve; The percentage of the length of the overlapping curve to the length of the standard particle size distribution curve is the actual characterization parameter of the abrasive particle size, and the actual characterization parameter is compared with the preset characterization parameter; If the actual characterization parameter is greater than or equal to the preset characterization parameter, it is determined that the abrasive particle size is qualified; If the actual characterization parameter is less than the preset characterization parameter, it is determined that the abrasive particle size is unqualified and the abrasive needs to be replaced or repaired; Wherein, the standard particle size distribution curve is the particle size distribution curve of the abrasive particle size before being put into use.

[0043] Specifically, the value range of the preset characterization parameter is set to [80%, 95%], and 90% is preferred in the embodiment of the present invention.

[0044] Specifically, 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; Setting a corresponding relationship between the corresponding difference and reducing the grinding speed to adjust the grinding speed; In a specific implementation, the second proportion is subtracted from the preset proportion to obtain a first difference value, and the first difference value is compared with the preset difference value; If the first difference is greater than the preset difference, determining to reduce the grinding speed by a first speed adjustment coefficient; If the first difference is less than or equal to the preset difference, it is determined to reduce the grinding speed by a second speed adjustment coefficient.

[0045] Specifically, the value range of the preset difference is set to [1%, 5%], and 3% is preferred in the embodiment 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 embodiment 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 embodiment of the present invention.

[0046] Specifically, the process of adjusting the polishing pressure of 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.

[0047] In a specific implementation, the first proportion is subtracted from the preset proportion to obtain a second difference value, and the second difference value is compared with the preset difference value; If the second difference is greater than the preset difference, determining to reduce the polishing pressure by a first pressure adjustment coefficient; If the second difference is less than or equal to the preset difference, it is determined to reduce the polishing pressure by a second pressure adjustment coefficient.

[0048] Specifically, the value range of the first pressure adjustment coefficient is set to [0.94, 0.96], and 0.95 is preferably selected in the embodiment of the present invention; the value range of the second pressure adjustment coefficient is set to [0.97, 0.99], and 0.98 is preferably selected in the embodiment of the present invention.

[0049] It can be understood that the corresponding difference includes a first difference and a second difference. The corresponding relationship with the first difference is to use the first speed adjustment coefficient or the second speed adjustment coefficient to reduce the grinding speed, and the corresponding relationship with the second difference is to use the first pressure adjustment coefficient or the second pressure adjustment coefficient to reduce the polishing pressure.

[0050] Specifically, the process of determining the eligibility of the fine grinding accuracy of ceramic balls based on the 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; If the precision characterization parameter is greater than or equal to the preset parameter, it is determined that the fine grinding precision of the ceramic ball is qualified.

[0051] Specifically, the value of the sphericity o of the ceramic ball is the product of its corresponding weight coefficient α and the roughness r of the ceramic ball. a The sum of the product of the value of and its corresponding weight coefficient β is equal to the accuracy characterization parameter E, setting α=0.5, β=0.5.

[0052] Specifically, the value range of the preset characterization parameter is set to [0.06, 0.09], and 0.07 is preferred in the embodiment of the present invention.

[0053] Specifically, 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, and comparing the accuracy difference with a preset accuracy difference; If the accuracy difference is greater than the preset accuracy difference, determining to increase the preset degree of fit by a first correction coefficient; If the accuracy difference is less than or equal to the preset accuracy difference, it is determined to increase the preset degree of fit by a second correction coefficient.

[0054] Specifically, the value range of the preset precision difference is set to [0.01, 0.03], and 0.02 is preferred in the embodiment of the present invention; the value range of the first correction coefficient is set to [1.2, 1.4], and 1.3 is preferred in the embodiment of the present invention; the value range of the second correction coefficient is set to [1.01, 1.19], and 1.15 is preferred in the embodiment of the present invention.

[0055] It can be understood that in the embodiment of the present invention, all the adjustment coefficients are adjusted in the same manner as the corresponding adjustment parameters: the product of the adjustment coefficient and the corresponding adjustment parameter is the adjusted adjustment parameter.

[0056] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying 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 chips is qualified, the accuracy characterization parameters of the ceramic balls after fine grinding are obtained, and the qualification of the fine grinding accuracy of the ceramic balls is determined based on the accuracy characterization parameters, so as to adjust the preset fitting degree according to the condition that the fine grinding accuracy is unqualified.

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 distribution 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 distribution 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 grinding chips having a particle size smaller than the first particle size, and a second proportion of the ceramic balls having 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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