A grinding process for ceramic shaft of wire separator for medical equipment

Abstract

The present invention relates to the field of precision grinding technology, and in particular to a grinding process for a ceramic shaft column of a wire divider for medical devices, including: in the grinding process, collecting the vibration signal and equipment image of the grinding equipment in real time, and collecting the surface image of the ceramic shaft column; determining the real-time vibration amplitude and the real-time vibration frequency range according to the vibration signal, and determining the contact state between the grinding equipment and the ceramic shaft column according to the real-time vibration amplitude and the real-time vibration frequency range; determining the macroscopic and microscopic features of the ceramic shaft column according to the surface image, determining the surface roughness of the ceramic shaft column according to the microscopic features, and determining the degree of wear of the grinding equipment according to the equipment image; determining the adjustment method of the feed amount and grinding speed of the ceramic shaft column in different grinding stages according to the macroscopic features, surface roughness, degree of wear and contact state. The present invention realizes the refined control of the grinding process of the ceramic shaft column and improves the processing accuracy and surface quality.

Description

Technical Field

[0001] The invention relates to the technical field of precision grinding, and in particular to a grinding process for a ceramic shaft column of a wire divider for medical equipment. Background Art

[0002] The ceramic shaft column of the wire separator for medical devices is a key component made of ceramic material and used in medical device wire separators. It is used in medical devices involving wire operations, such as suturing devices, braiding devices, etc. The ceramic shaft column can be used as a support and guide element for wire separation, ensuring that the wire moves in a predetermined path and direction, preventing the wire from being entangled or disordered, and ensuring the accuracy and stability of wire separation.

[0003] Chinese patent publication number: CN119024765B, discloses a grinding control system for improving the flatness of ceramic workpieces, which collects ceramic roughness data and grinding work data in real time through laser sensors and integrated sensor groups, pre-processes data to obtain ceramic surface roughness data sets and grinding work data sets, calculates the ceramic surface roughness index Bcc through the ceramic surface roughness data sets, and performs a preliminary evaluation in combination with a preset ceramic surface roughness threshold A, calculates the grinding speed adjustment index Msd and the coolant flow adjustment index Lll through the grinding work data sets, and summarizes and calculates the comprehensive grinding control index ZHM, and performs a secondary evaluation of the grinding process.

[0004] It can be seen that the above technical solution mainly records and analyzes grinding data to identify significant parameters and optimize the grinding parameter combination to achieve the ideal flatness quality of ceramic workpieces. There are still the following problems:

[0005] The influence of grinding equipment vibration is not considered. The vibration of grinding equipment will cause the contact force between the grinding equipment and the ceramic workpiece to change, thereby forming uneven grinding marks on the surface of the ceramic workpiece and affecting the surface roughness. Summary of the invention

[0006] To this end, the present invention provides a ceramic shaft column grinding process for a wire divider for medical devices, which is used to overcome the problem that the ceramic workpiece grinding control system in the prior art does not take into account the influence of the vibration of the grinding equipment. The vibration of the grinding equipment will cause the contact force between the grinding equipment and the ceramic workpiece to change, thereby forming uneven grinding marks on the surface of the ceramic workpiece, affecting the surface roughness.

[0007] To achieve the above object, the present invention provides a grinding process for a ceramic shaft column of a wire separator for medical devices, comprising:

[0008] Step S1, during the grinding process, real-time acquisition of vibration signals and equipment images of the grinding equipment, and acquisition of surface images of the ceramic shaft column;

[0009] Step S2, determining a real-time vibration amplitude and a real-time vibration frequency range according to the vibration signal, and determining a contact state between the grinding device and the ceramic shaft column according to the real-time vibration amplitude and the real-time vibration frequency range;

[0010] Step S3, determining the macroscopic features / microscopic features of the ceramic shaft column according to the surface image, determining the surface roughness of the ceramic shaft column according to the microscopic features, and determining the degree of wear of the grinding device according to the device image;

[0011] Step S4, determining a method for adjusting the feed amount and grinding speed of the ceramic shaft column in the rough grinding stage according to the macroscopic characteristics, the wear degree and the contact state;

[0012] Step S5, determining the surface roughness of the ceramic shaft column according to the microscopic features, and determining the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage according to the surface roughness and the contact state;

[0013] The macroscopic features are determined according to the surface image corresponding to the rough grinding stage, and the microscopic features are determined according to the surface image corresponding to the fine grinding stage.

[0014] Further, in step S2, the vibration amplitude state is judged as normal amplitude or abnormal amplitude based on the preset time interval and the real-time vibration amplitude, the vibration frequency state is judged as normal frequency or abnormal frequency based on the comparison result between the real-time vibration frequency range and the preset vibration frequency range, and the contact state is judged as normal contact or poor contact based on the vibration amplitude state and the vibration frequency state.

[0015] Furthermore, in step S2, the vibration signal is divided into sub-signal segments based on a preset time interval, and the vibration amplitude change rate in adjacent time periods is determined according to the real-time vibration amplitude in each sub-signal segment to determine the vibration amplitude state.

[0016] Further, in the step S2, determining the vibration frequency state includes:

[0017] If the real-time vibration frequency range is within the preset vibration frequency range, the vibration frequency state is determined to be normal;

[0018] If the real-time vibration frequency range exceeds the preset vibration frequency range, the vibration frequency state is determined to be frequency abnormality.

[0019] Furthermore, in the step S3, during the rough grinding stage, the macroscopic features of the ceramic shaft column are determined according to the surface image, including:

[0020] Determine the crack area and edge chipping area of ​​the ceramic shaft column according to the surface image;

[0021] Determine the crack position change trend of the crack region and the edge collapse area change trend of the edge collapse region;

[0022] The macroscopic characteristics of the ceramic shaft column are determined according to the crack position change trend and the edge chipping area change trend; wherein the macroscopic characteristics include defect expansion and defect stability.

[0023] Furthermore, in step S4, the feed amount and grinding speed of the ceramic shaft column in the rough grinding stage are adjusted according to the macroscopic characteristics, contact state and wear degree, including:

[0024] If the macroscopic feature is that the defect is stable and the contact state is that the contact is normal, the feed rate and grinding speed are maintained;

[0025] If the macroscopic feature is defect expansion or the contact state is poor contact, reduce the feed rate or grinding speed, and determine whether the grinding equipment needs to be replaced based on the degree of wear.

[0026] Furthermore, in step S4, an adjustment coefficient is determined based on the crack position change trend and the chipping area change trend, a feed reduction amount is determined according to the adjustment coefficient and a preset feed amount, and a speed reduction amount is determined according to the adjustment coefficient and a preset grinding speed.

[0027] Furthermore, in the step S5, the roughness variation trend is determined according to the surface roughness, and the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage is determined according to the roughness variation trend and the contact state, including:

[0028] If the contact state is normal and the roughness change trend is decreasing, it is determined to maintain the feed amount and the grinding speed;

[0029] If the contact state is normal and the roughness change trend is constant, it is determined to reduce the feed amount or grinding speed, and determine the fine grinding roughness of the ceramic shaft column after a preset adjustment time period, and based on the fine grinding roughness, determine whether it is necessary to check the grinding equipment state.

[0030] Further, in the step S5, the roughness difference is determined based on the fine grinding roughness and the preset roughness, and whether the grinding equipment state needs to be checked is determined according to the comparison result between the roughness difference and the preset difference threshold, including:

[0031] If the roughness difference is less than the preset difference threshold, the grinding device state is checked.

[0032] Furthermore, in the step S5, it also includes:

[0033] If the contact state is poor contact, reduce the feed rate or grinding speed;

[0034] Wherein, the feed amount or grinding speed is adjusted according to a preset percentage.

[0035] Compared with the prior art, the beneficial effect of the present invention is that the present invention collects the vibration signal of the grinding equipment, the equipment image and the surface image of the ceramic shaft column in real time during the grinding process, and determines the real-time vibration amplitude and frequency range by analyzing the vibration signal, so as to accurately judge the contact state between the grinding equipment and the ceramic shaft column, and promptly detect abnormal conditions such as poor contact, providing a reliable basis for subsequent adjustments. By analyzing the surface image of the ceramic shaft column, its macroscopic and microscopic features can be clearly identified, which helps to deeply understand the processing quality of the shaft column, and facilitates the subsequent comprehensive macroscopic features, surface roughness, wear degree and contact state to determine the feed amount and grinding speed adjustment method of the ceramic shaft column in different grinding stages, which can improve the surface flatness of the finished ceramic shaft column, increase self-lubrication, realize refined control of the grinding process, and improve processing accuracy and surface quality.

[0036] Furthermore, in the process of grinding ceramic shaft columns, the present invention can monitor the processing process in real time and accurately, and timely discover potential problems such as grinding wheel wear and workpiece loosening, by judging the vibration amplitude state based on the preset time interval and the real-time vibration amplitude, and comparing the real-time vibration frequency range with the preset vibration frequency range to judge the vibration frequency state, and further judging the contact state based on the combination of the two. Secondly, ensure that the ceramic shaft column is in a stable contact state with the grinding equipment, so that the surface of the ceramic shaft column is ground evenly, effectively improve the surface flatness of the product, increase self-lubrication, realize refined control of the grinding process, and improve processing accuracy and surface quality.

[0037] Furthermore, the present invention can accurately understand the changes in the macroscopic characteristics of the ceramic shaft column by real-time monitoring the changes in defects such as cracks and chipping of the ceramic shaft column during the rough grinding stage, and then determine whether the surface defects of the ceramic shaft column are stable in an expanded state or a stable state during the rough grinding process, which helps to optimize the rough grinding process, avoid defect deterioration, make the grinding process more stable, reduce damage to the shaft column surface, effectively improve the surface flatness of the product, increase self-lubrication, achieve refined control of the grinding process, and improve processing accuracy and surface quality.

[0038] Furthermore, the present invention determines the adjustment coefficient based on the trend of crack position change and the trend of edge collapse area change, and determines the feed reduction amount and speed reduction amount according to the adjustment coefficient and the preset feed amount and preset grinding speed. The feed amount and grinding speed can be accurately adjusted according to the actual defect changes of the ceramic shaft column, which helps to improve the surface flatness of the ceramic shaft column, improve the controllability of the grinding process, further reduce the wear and consumption of the grinding equipment, and improve the processing accuracy and surface quality.

[0039] Furthermore, the present invention determines the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage according to the surface roughness and contact state, so as to reduce the surface roughness of the ceramic shaft column toward the preset target and ensure the quality and efficiency of the fine grinding process. At the same time, after adjusting the relevant parameters, the state of the grinding equipment is checked based on the results of the change in the surface roughness of the ceramic shaft column, effectively realizing the refined control of the grinding process and improving the processing accuracy and surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a step diagram of a grinding process for a ceramic shaft column of a wire separator for medical devices according to an embodiment of the present invention;

[0041] Figure 2 A diagram of the steps for determining macroscopic features according to an embodiment of the present invention;

[0042] Figure 3 A step diagram for determining an adjustment method in a rough grinding stage according to an embodiment of the present invention;

[0043] Figure 4 A diagram showing the steps of determining the adjustment method in the fine grinding stage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] See also Figure 1 As shown, it is a step diagram of a grinding process of a ceramic shaft column of a wire separator for medical devices according to an embodiment of the present invention; specifically, the present invention provides a grinding process of a ceramic shaft column of a wire separator for medical devices, comprising:

[0048] Step S1, during the grinding process, real-time acquisition of vibration signals and equipment images of the grinding equipment, and acquisition of surface images of the ceramic shaft column;

[0049] Step S2, determining a real-time vibration amplitude and a real-time vibration frequency range according to the vibration signal, and determining a contact state between the grinding device and the ceramic shaft column according to the real-time vibration amplitude and the real-time vibration frequency range;

[0050] Step S3, determining the macroscopic features / microscopic features of the ceramic shaft column according to the surface image, determining the surface roughness of the ceramic shaft column according to the microscopic features, and determining the degree of wear of the grinding device according to the device image;

[0051] Step S4, determining a method for adjusting the feed amount and grinding speed of the ceramic shaft column in the rough grinding stage according to the macroscopic characteristics, the wear degree and the contact state;

[0052] Step S5, determining the surface roughness of the ceramic shaft column according to the microscopic features, and determining the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage according to the surface roughness and the contact state;

[0053] The macroscopic features are determined according to the surface image corresponding to the rough grinding stage, and the microscopic features are determined according to the surface image corresponding to the fine grinding stage.

[0054] It is understandable that when grinding a ceramic shaft column with a grinding device, the grinding device vibrates and the grinding force fluctuates. This unstable force will cause uneven material removal in local areas of the ceramic shaft column during the removal process. At the same time, the instantaneous high pressure and high temperature generated by the vibration will cause the gas inside the ceramic to be discharged, forming pores on the surface. For example, when the vibration frequency of the grinding device is close to the natural frequency of the ceramic material, resonance will occur, aggravating the fluctuation of the grinding force, and further increasing the probability of pores.

[0055] It is understandable that the vibration of the grinding equipment will cause the grinding force to change continuously, resulting in an unstable contact state between the grinding equipment and the ceramic shaft column. During the grinding process, grinding marks of varying depths and widths will be formed on the surface of the ceramic shaft column, which will directly increase the surface roughness, making the surface uneven and reducing the smoothness. Vibration may also cause the local wear of the grinding equipment to intensify, resulting in uneven distribution of abrasive particles on the surface of the grinding equipment, further affecting the surface roughness and smoothness.

[0056] It is understandable that the grinding effect of the ceramic shaft column can be evaluated based on the change in the surface roughness of the ceramic shaft column and the contact state between the ceramic shaft column and the grinding equipment during the grinding process, and then the feed amount and feed speed of the ceramic shaft column can be adjusted to reduce the impact on the surface flatness of the ceramic shaft column. Therefore, the vibration signal of the grinding equipment is collected during the grinding process to determine the contact state between the grinding equipment and the ceramic shaft column, and the surface image of the ceramic shaft column and the device image of the grinding equipment are collected to determine the wear state of the grinding equipment during the grinding process and the change in the roughness of the surface of the ceramic shaft column, providing a data analysis basis for subsequent adjustments.

[0057] It is understandable that the ceramic shaft column needs to be rough ground and fine ground during the processing. Rough grinding is mainly to remove the ceramic shaft column excess so that the ceramic shaft column is close to the final shape and size. The ceramic chipping and cracks that appear during rough grinding will destroy the surface integrity and structural strength of the ceramic shaft column, and affect the uniformity of the subsequent processing allowance of fine grinding. Fine grinding mainly ensures dimensional accuracy and obtains a smooth surface. The main purpose of fine grinding is to obtain high-precision dimensions and good surface quality, among which surface roughness is one of the important indicators for measuring surface quality. Therefore, by combining the microscopic characteristics during fine grinding and the macroscopic characteristics during rough grinding to realize the status evaluation of the ceramic shaft column and the grinding equipment during the working process, the evaluation results can be more accurate and reasonable.

[0058] In implementation, a vibration sensor may be installed on the grinding wheel spindle of the grinding device to ensure that the vibration sensor can collect the vibration signal of the grinding device during the grinding process.

[0059] In a specific embodiment, the degree of wear of the grinding device is determined according to the device image, the outer diameter of the grinding wheel is determined based on the device image, the degree of wear is determined according to the outer diameter of the grinding wheel and the outer diameter of the original grinding wheel, the degree of wear = 1-outer diameter of the grinding wheel / outer diameter of the original grinding wheel, the texture of the rough surface is disordered, the texture of the smooth surface is regular and flat, the surface roughness of the ceramic shaft column is determined according to the microscopic features of the surface image, the surface image is processed, the texture features are extracted, the texture features are used as microscopic features, and texture analysis methods such as gray level co-occurrence matrix (GLCM), local binary pattern (LBP), etc. are adopted. GLCM can calculate the texture feature parameters such as contrast, correlation, energy, entropy, etc. of the image. High contrast and large entropy values ​​usually correspond to higher surface roughness. LBP obtains texture features by statistically analyzing the binary patterns of local pixels. The higher the complexity of the texture features, the greater the surface roughness.

[0060] The present invention collects the vibration signal of the grinding equipment, the equipment image and the surface image of the ceramic shaft column in real time during the grinding process. By analyzing the vibration signal to determine the real-time vibration amplitude and frequency range, it can accurately judge the contact state between the grinding equipment and the ceramic shaft column, and promptly detect abnormal conditions such as poor contact, providing a reliable basis for subsequent adjustments. By analyzing the surface image of the ceramic shaft column, its macroscopic and microscopic features can be clearly identified, which helps to gain an in-depth understanding of the processing quality of the shaft column, and facilitates the subsequent comprehensive macroscopic features, surface roughness, degree of wear and contact state to determine the feed amount and grinding speed adjustment method of the ceramic shaft column in different grinding stages, which can improve the surface flatness of the finished ceramic shaft column, increase self-lubrication, achieve refined control of the grinding process, and improve processing accuracy and surface quality.

[0061] Specifically, in step S2, the vibration amplitude state is judged as normal amplitude or abnormal amplitude based on the preset time interval and the real-time vibration amplitude, the vibration frequency state is judged as normal frequency or abnormal frequency based on the comparison result between the real-time vibration frequency range and the preset vibration frequency range, and the contact state is judged as normal contact or poor contact based on the vibration amplitude state and the vibration frequency state.

[0062] It is understandable that during the grinding of ceramic shafts, the vibration amplitude and frequency can directly reflect whether the grinding process is stable. By real-time monitoring of the vibration amplitude and frequency and judging whether the vibration amplitude and vibration frequency are normal, possible problems that may occur during the processing can be detected in time, such as grinding wheel wear, unstable workpiece installation, improper grinding parameter settings, etc.

[0063] It is understandable that a stable contact state is crucial to ensuring the processing quality of ceramic shafts. Abnormal vibration amplitude and vibration frequency are often related to poor contact. Poor contact may lead to uneven grinding of the shaft surface, inconsistent roughness and other quality problems. The contact state is judged by comprehensively analyzing the vibration amplitude state and vibration frequency state. Once poor contact is found, the processing parameters can be adjusted or the equipment can be checked in time to avoid damage to the processing quality.

[0064] In a specific embodiment, the ceramic shaft column is made of ceramic (zirconia) and the grinding device is a grinding wheel. The value range of the preset time interval is 10s to 20s. Preferably, the value of the preset time interval is 15s. The value of the preset vibration frequency range is 30Hz to 180Hz. Preferably, the value of the preset vibration frequency range is 600Hz to 150Hz. In implementation, the values ​​of the preset time interval and the preset vibration frequency range can be determined according to actual conditions, and are not specifically limited here and will not be repeated.

[0065] Specifically, in step S2, the vibration signal is divided into sub-signal segments based on a preset time interval, and the vibration amplitude change rate in adjacent time periods is determined according to the real-time vibration amplitude in each sub-signal segment to determine the vibration amplitude state.

[0066] It is understandable that in order to analyze the changes in vibration amplitude more carefully, the collected vibration signal is divided into several sub-signal segments based on a preset time interval, and the vibration amplitude change characteristics are studied based on different time segments to promptly discover the instantaneous changes and trends in the vibration amplitude.

[0067] In a specific embodiment, the collected vibration signal is divided into several sub-signal segments based on a preset time interval, with each 15 seconds being a sub-signal segment. The average vibration amplitude is determined based on the real-time vibration amplitude in each sub-signal segment, and the vibration amplitude change rate is determined by comparing the average vibration amplitudes in adjacent time periods. +1 time period relative to the The rate of change of vibration amplitude in each time period = ( +1 time period corresponds to the average vibration amplitude - The average vibration amplitude corresponding to each time period) ÷ the The average vibration amplitude corresponds to each time period, and the vibration amplitude state is determined according to the positive and negative and magnitude of the vibration amplitude change rate. If the vibration amplitude change rate is within the preset change rate range, the vibration amplitude state is considered to be normal in amplitude. If the vibration amplitude change rate exceeds the preset change rate range, the vibration amplitude state is considered to be abnormal in amplitude. Preferably, the value of the preset change rate range is ±8%. In implementation, the value of the preset change rate range is not specifically limited here and will not be repeated.

[0068] Specifically, in step S2, determining the vibration frequency state includes:

[0069] If the real-time vibration frequency range is within the preset vibration frequency range, the vibration frequency state is determined to be normal;

[0070] If the real-time vibration frequency range exceeds the preset vibration frequency range, the vibration frequency state is determined to be frequency abnormality.

[0071] It is understandable that the preset vibration frequency range is based on a large amount of experimental data, experience and theoretical analysis, and represents the vibration frequency range that the grinding equipment and the ceramic shaft column system should be in under normal grinding conditions. In the actual process of ceramic shaft column grinding, the real-time vibration frequency range is obtained through the vibration signal, and the real-time vibration frequency range is compared with the preset vibration frequency range. If the real-time vibration frequency range falls completely within the preset vibration frequency range, it means that the grinding process is in a stable and controllable state in terms of vibration frequency; on the contrary, if the real-time vibration frequency range exceeds the preset vibration frequency range, whether it is higher or lower than the preset range, it is judged as a frequency abnormality, which means that there may be equipment failure, unreasonable grinding parameters, workpiece material problems, etc., and the cause needs to be further investigated.

[0072] In the process of grinding ceramic shaft columns, the present invention can monitor the processing process in real time and accurately, and timely discover potential problems such as grinding wheel wear and workpiece loosening, by judging the vibration amplitude state based on the preset time interval and the real-time vibration amplitude, and comparing the real-time vibration frequency range with the preset vibration frequency range to judge the vibration frequency state, and further judging the contact state based on the combination of the two. Secondly, ensure that the ceramic shaft column is in a stable contact state with the grinding equipment, so that the surface of the ceramic shaft column is ground evenly, effectively improve the surface flatness of the product, increase self-lubrication, realize refined control of the grinding process, and improve processing accuracy and surface quality.

[0073] See also Figure 2 As shown, it is a step diagram of determining macroscopic features in an embodiment of the present invention; specifically, in step S3, in the rough grinding stage, determining the macroscopic features of the ceramic shaft column according to the surface image includes:

[0074] Step S31, determining the crack area and edge collapse area of ​​the ceramic shaft column according to the surface image;

[0075] Step S32, determining a crack position change trend of the crack region and a chipping area change trend of the chipping region;

[0076] Step S33, determining the macroscopic characteristics of the ceramic shaft column according to the crack position change trend and the edge chipping area change trend;

[0077] Among them, the macroscopic characteristics include defect expansion and defect stabilization.

[0078] It is understandable that cracks and chipping during grinding are closely related to grinding process parameters. Observing the changing trend of crack position and chipping area can intuitively reflect whether the current grinding process is suitable. If defect expansion occurs, it means that the current process parameters may need to be adjusted, such as grinding wheel speed, feed rate, grinding depth, etc.

[0079] In a specific embodiment, an image recognition algorithm is used to accurately divide the crack area and the edge collapse area by combining the differences between the crack and edge collapse area and the normal surface area in terms of color, texture, grayscale, etc. As the rough grinding process continues, the crack position change trend of the crack area is tracked by comparing the surface images taken at different time points. For example, observe whether the crack endpoint is expanding, whether the crack direction changes, etc., so as to determine the crack position change trend. By comparing the size of the edge collapse area at adjacent time points, it is determined whether the edge collapse area is increasing, decreasing or remaining stable, and then the edge collapse area change trend is determined. The edge collapse area change trend can be determined by image segmentation and area calculation methods. Subsequently, the macroscopic characteristics of the ceramic shaft column are comprehensively judged based on the determined crack position change trend and edge collapse area change trend. If the crack position continues to expand and the edge collapse area continues to increase, it indicates that the defect of the ceramic shaft column deteriorates during the rough grinding process, that is, the macroscopic characteristic is defect expansion; on the contrary, if the crack position is basically stable and the edge collapse area does not change significantly, it means that the rough grinding process has little effect on the defects of the ceramic shaft column, and the macroscopic characteristic is defect stability.

[0080] The present invention can accurately understand the changes in the macroscopic characteristics of the ceramic shaft column by real-time monitoring the changes in defects such as cracks and edge collapse of the ceramic shaft column during the rough grinding stage, and further determine whether the surface defects of the ceramic shaft column are stable in an expanded state or a stable state during the rough grinding process. This helps to optimize the rough grinding process, avoid defect deterioration, make the grinding process more stable, reduce damage to the shaft column surface, effectively improve the surface flatness of the product, increase self-lubrication, achieve refined control of the grinding process, and improve processing accuracy and surface quality.

[0081] See also Figure 3 As shown, it is a step diagram of determining the adjustment method in the rough grinding stage according to an embodiment of the present invention. Specifically, in step S4, the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the rough grinding stage is determined according to the macroscopic characteristics, contact state and wear degree, including:

[0082] If the macroscopic feature is that the defect is stable and the contact state is that the contact is normal, the feed rate and grinding speed are maintained;

[0083] If the macroscopic feature is defect expansion or the contact state is poor contact, reduce the feed rate or grinding speed, and determine whether the grinding equipment needs to be replaced based on the degree of wear.

[0084] It is understandable that if the defect is stable and the contact is normal, it means that the current grinding parameters can maintain the grinding process well, and the feed rate and grinding speed are maintained. If the macroscopic feature is defect expansion or the contact state is poor contact, it means that the current grinding force may be too large, causing the cracks, edge collapse and other defects on the surface of the ceramic shaft column to further expand. By reducing the feed rate, the amount of cutting of the ceramic shaft column by the grinding equipment per unit time can be reduced, and the grinding force can be reduced. At the same time, a higher grinding speed will generate more grinding heat and impact force, which is not conducive to controlling the expansion of defects.

[0085] In a specific embodiment, if the macroscopic feature is defect expansion or the contact state is poor contact, the feed rate or grinding speed is reduced, the feed rate is reduced by 20% to 30%, and the grinding speed is reduced by 10% to 15%. At the same time, after reducing the feed rate or grinding speed, check the degree of wear of the grinding wheel. If the degree of wear is greater than the preset degree of wear, replace the grinding equipment, that is, the grinding wheel, to ensure grinding stability. The preset degree of wear has a value range of 8% to 12%. Preferably, the preset degree of wear has a value of 10%. In implementation, the value range and preferred value of the preset degree of wear can be determined according to actual conditions, and are not specifically limited here and will not be repeated.

[0086] Specifically, in step S4, an adjustment coefficient is determined based on the crack position change trend and the chipping area change trend, a feed reduction amount is determined according to the adjustment coefficient and a preset feed amount, and a speed reduction amount is determined according to the adjustment coefficient and a preset grinding speed.

[0087] It is understandable that the trend of crack position change and the trend of edge collapse area change reflect the development of defects in the ceramic shaft column during the grinding process. By analyzing these trends, the degree of influence of the current grinding parameters on the ceramic shaft column can be determined. The adjustment coefficient comprehensively considers factors such as the speed of crack position expansion and the rate of increase of edge collapse area. If the crack position expands rapidly and the edge collapse area increases sharply, the adjustment coefficient will be relatively large, and the grinding parameters will be adjusted to a large extent; conversely, if the defect change trend is relatively gentle, the adjustment coefficient will be small.

[0088] It can be understood that the preset feed amount is the shaft column feed amount set under normal grinding conditions, and the preset grinding speed is the rotation speed of the grinding equipment during normal grinding. Adjusting the feed amount or grinding speed helps to improve the grinding condition of the ceramic shaft column, reduce the heat and impact force generated during the grinding process, and avoid the deterioration of defects.

[0089] In a specific embodiment, the preset feed rate ranges from 15 mm / min to 20 mm / min, and preferably, the preset feed rate is 17 mm / min. The preset grinding speed ranges from 10 m / s to 20 m / s, and preferably, the preset grinding speed is 15 m / s. Determine the defect change trend within a specified time period, such as in 10 minutes, check the crack position change and the edge collapse area change during the rough grinding process. If the crack length increases and the edge collapse area also increases, the adjustment coefficient increases, showing a positive correlation. The adjustment coefficient ranges from 0 to 1. Based on this constraint, a correlation is constructed. The adjustment coefficient is the output value, and the edge collapse area change trend and the crack position change within the specified time period are taken as input values ​​to determine the adjustment coefficient. The adjustment coefficient can be determined according to the support vector machine regression algorithm. Feed reduction amount = adjustment coefficient × preset feed amount; speed reduction amount = adjustment coefficient × preset grinding speed. In implementation, the value range and preferred value of the preset feed amount and the preset grinding speed can be determined according to actual conditions, and are not specifically limited here and will not be elaborated.

[0090] The present invention determines the adjustment coefficient based on the change trend of the crack position and the change trend of the edge collapse area, and determines the feed reduction amount and speed reduction amount according to the adjustment coefficient and the preset feed amount and the preset grinding speed. The feed amount and the grinding speed can be accurately adjusted according to the actual defect changes of the ceramic shaft column, which helps to improve the surface flatness of the ceramic shaft column, improve the controllability of the grinding process, further reduce the wear and consumption of the grinding equipment, and improve the processing accuracy and surface quality.

[0091] See also Figure 4 As shown, Figure 4 The step diagram for determining the adjustment method in the fine grinding stage of the embodiment of the present invention. Specifically, in the step S5, the roughness change trend is determined according to the surface roughness, and the adjustment method for the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage is determined according to the roughness change trend and the contact state, including:

[0092] If the contact state is normal and the roughness change trend is decreasing, it is determined to maintain the feed amount and the grinding speed;

[0093] If the contact state is normal and the roughness change trend is constant, it is determined to reduce the feed amount or grinding speed, and determine the fine grinding roughness of the ceramic shaft column after a preset adjustment time period, and based on the fine grinding roughness, determine whether it is necessary to check the grinding equipment state.

[0094] It is understandable that during the fine grinding process, the surface roughness of the ceramic shaft column will become closer and closer to the preset roughness. Therefore, if the grinding process is normal, the surface roughness of the ceramic shaft column will show a downward trend, proving that the current grinding speed and feed rate are normal. If the fluctuation of the surface roughness of the ceramic shaft column is not obvious, it means that there is a problem with the setting of related parameters, resulting in low grinding efficiency and failure to effectively remove the microscopic roughness of the shaft column surface, making it difficult to achieve the expected reduction effect of surface roughness. For example, the grinding speed may be too low, and the grinding wheel cannot fully cut the surface of the ceramic shaft column, or the feed rate may be too large, resulting in the grinding wheel's single cutting depth of the shaft column surface being too large, destroying the uniform removal of the surface microstructure, and thus affecting the improvement of surface roughness.

[0095] It is understandable that after adjusting the feed rate and grinding speed, the grinding roughness of the ceramic shaft column during the grinding process can be observed based on the preset adjustment time period. If the grinding roughness improves after reducing the feed rate or grinding speed and gradually approaches the preset roughness target value, it means that the adjustment is reasonable. If the grinding roughness still does not improve after reducing the feed rate or grinding speed, it is necessary to further check the state of the grinding equipment, such as whether it needs to be repaired or replaced.

[0096] In a specific embodiment, the method for determining the fine grinding roughness after the preset adjustment time period is the same as the method for determining the surface roughness, both of which are determined based on image processing and texture analysis methods. The roughness change trend is determined based on the surface roughness. If the contact state is normal and the roughness change trend is constant, the feed rate or grinding speed is reduced, the feed rate is reduced by 5% to 10%, and the grinding speed is reduced by 5% to 10%. The value range of the preset adjustment time period is 5min to 10min. Preferably, the value of the preset adjustment time period is 8min.

[0097] The present invention determines the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage according to the surface roughness and contact state, so as to promote the surface roughness of the ceramic shaft column to decrease toward the preset target and ensure the quality and efficiency of the fine grinding process. At the same time, after adjusting the relevant parameters, the grinding equipment state is checked based on the results of the change in the surface roughness of the ceramic shaft column, effectively realizing the refined control of the grinding process and improving the processing accuracy and surface quality.

[0098] Specifically, in step S5, the roughness difference is determined based on the fine grinding roughness and the preset roughness, and whether the grinding equipment state needs to be checked is determined according to the comparison result between the roughness difference and the preset difference threshold, including:

[0099] If the roughness difference is less than the preset difference threshold, the grinding device state is checked.

[0100] It is understandable that after reducing the feed rate or grinding speed and after a preset adjustment period, the fine grinding roughness of the ceramic shaft column is determined again, and the difference is calculated with the preset roughness to determine the roughness difference, and based on the comparison result of the roughness difference and the preset difference threshold, it is determined whether the grinding equipment status needs to be checked. If the roughness difference is not greater than or equal to the preset difference threshold, it means that the surface roughness of the ceramic shaft column has improved after adjustment, and there is no need to check the grinding equipment status. If the roughness difference is less than the preset difference threshold, it means that the surface roughness improvement after adjustment is not ideal, and it is necessary to further check the grinding equipment status to determine whether to correct or replace it.

[0101] In a specific embodiment, the value range of the preset roughness is 0.1-0.15, preferably, the value of the preset roughness is 0.12; the value range of the preset difference threshold is 0.2-0.3, preferably, the value of the preset difference threshold is 0.25. In implementation, the value range and preferred value of the preset roughness and the preset difference threshold can be determined according to actual conditions, and are not specifically limited here, and will not be repeated.

[0102] Specifically, in the step S5, it also includes:

[0103] If the contact state is poor contact, reduce the feed rate or grinding speed;

[0104] Wherein, the feed amount or grinding speed is adjusted according to a preset percentage.

[0105] It is understandable that when the contact between the grinding device and the ceramic shaft column is unstable, the feed rate of the ceramic shaft column can be quickly reduced to reduce the impact of vibration on the grinding process. The feed rate adjustment range is larger than the feed rate adjustment range when the contact state is normal and the roughness change trend is constant.

[0106] In a specific embodiment, the preset percentage has a value range of 20% to 40%, and preferably, the preset percentage has a value of 30%. In implementation, the value range and preferred value of the preset percentage can be determined according to actual conditions, and are not specifically limited here and will not be described in detail.

[0107] 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 grinding process for ceramic shafts of wire separators for medical devices, characterized in that: include: Step S1, during the grinding process, real-time acquisition of vibration signals and equipment images of the grinding equipment, and acquisition of surface images of the ceramic shaft column; Step S2, determining a real-time vibration amplitude and a real-time vibration frequency range according to the vibration signal, and determining a contact state between the grinding device and the ceramic shaft column according to the real-time vibration amplitude and the real-time vibration frequency range; Step S3, determining the macroscopic features / microscopic features of the ceramic shaft column according to the surface image, and determining the wear degree of the grinding device according to the device image; Step S4, determining a method for adjusting the feed amount and grinding speed of the ceramic shaft column in the rough grinding stage according to the macroscopic characteristics, the wear degree and the contact state; Step S5, determining the surface roughness of the ceramic shaft column according to the microscopic features, and determining the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage according to the surface roughness and the contact state; The macroscopic features are determined according to the surface image corresponding to the rough grinding stage, and the microscopic features are determined according to the surface image corresponding to the fine grinding stage.

2. The grinding process of ceramic shaft column of the wire separator for medical equipment according to claim 1, characterized in that: In step S2, the vibration amplitude state is judged as normal amplitude or abnormal amplitude based on the preset time interval and the real-time vibration amplitude, the vibration frequency state is judged as normal frequency or abnormal frequency based on the comparison result between the real-time vibration frequency range and the preset vibration frequency range, and the contact state is judged as normal contact or poor contact based on the vibration amplitude state and the vibration frequency state.

3. The grinding process of ceramic shaft column of the wire separator for medical equipment according to claim 2, characterized in that: In step S2, the vibration signal is divided into sub-signal segments based on a preset time interval, and the vibration amplitude change rate in adjacent time periods is determined according to the real-time vibration amplitude in each sub-signal segment to determine the vibration amplitude state.

4. The grinding process of ceramic shaft column of a wire separator for medical equipment according to claim 2, characterized in that: In the step S2, determining the vibration frequency state includes: If the real-time vibration frequency range is within the preset vibration frequency range, the vibration frequency state is determined to be normal; If the real-time vibration frequency range exceeds the preset vibration frequency range, the vibration frequency state is determined to be frequency abnormality.

5. The grinding process of ceramic shaft column of a wire separator for medical equipment according to claim 1, characterized in that: In the step S3, during the rough grinding stage, the macroscopic features of the ceramic shaft column are determined according to the surface image, including: Determine the crack area and edge chipping area of ​​the ceramic shaft column according to the surface image; Determine the crack position change trend of the crack region and the edge collapse area change trend of the edge collapse region; The macroscopic characteristics of the ceramic shaft column are determined according to the crack position change trend and the edge chipping area change trend; wherein the macroscopic characteristics include defect expansion and defect stability.

6. The grinding process of ceramic shaft column of the wire separator for medical equipment according to claim 5, characterized in that: In step S4, the feed amount and grinding speed of the ceramic shaft column are adjusted in the rough grinding stage according to the macroscopic characteristics, contact state and wear degree, including: If the macroscopic feature is that the defect is stable and the contact state is that the contact is normal, the feed rate and grinding speed are maintained; If the macroscopic feature is defect expansion or the contact state is poor contact, reduce the feed rate or grinding speed, and determine whether the grinding equipment needs to be replaced based on the degree of wear.

7. The grinding process of ceramic shaft column of a wire separator for medical equipment according to claim 6, characterized in that: In step S4, an adjustment coefficient is determined based on the crack position change trend and the chipping area change trend, a feed reduction amount is determined according to the adjustment coefficient and a preset feed amount, and a speed reduction amount is determined according to the adjustment coefficient and a preset grinding speed.

8. The grinding process of ceramic shaft column of a wire separator for medical equipment according to claim 7, characterized in that: In the step S5, the roughness variation trend is determined according to the surface roughness, and the adjustment method of the feed amount and grinding speed of the ceramic shaft column in the fine grinding stage is determined according to the roughness variation trend and the contact state, including: If the contact state is normal and the roughness change trend is decreasing, it is determined to maintain the feed amount and the grinding speed; If the contact state is normal and the roughness change trend is constant, it is determined to reduce the feed amount or grinding speed, and determine the fine grinding roughness of the ceramic shaft column after a preset adjustment time period, and based on the fine grinding roughness, determine whether it is necessary to check the grinding equipment state.

9. The grinding process of ceramic shaft column of a wire separator for medical equipment according to claim 8, characterized in that: In step S5, the roughness difference is determined based on the fine grinding roughness and the preset roughness, and whether the grinding equipment state needs to be checked is determined according to the comparison result between the roughness difference and the preset difference threshold, including: If the roughness difference is less than the preset difference threshold, the grinding device state is checked.

10. The grinding process of ceramic shaft column of a wire separator for medical equipment according to claim 8, characterized in that: In the step S5, it also includes: If the contact state is poor contact, reduce the feed rate or grinding speed; Wherein, the feed amount or grinding speed is adjusted according to a preset percentage.

Images