Grinding machining method for complex integral impeller

Abstract

The invention relates to the technical field of grinding and polishing, in particular to a grinding machining method for a complex integral impeller, which comprises the following steps: acquiring the feeding speed of an abrasive flow polishing machine, the abrasive flow speed and the impeller temperature in the impeller grinding and polishing process; temperature oscillation values of the temperature subsequences are obtained according to the temperature variation deviation conditions in the temperature subsequences, and the flow velocity variation degrees of the abrasive flow polishing machine in the time periods are obtained in combination with the flow velocity deviation conditions in the flow velocity subsequences; fitting the flow velocity change degrees of all the time periods, analyzing the change trend of the flow velocity change degrees, obtaining the feeding adjusting speed of the abrasive flow polishing machine in the current time period by combining the feeding speed of the abrasive flow polishing machine in the current time period, and adjusting a feeding valve in the impeller grinding process. The grinding machining quality and efficiency of the complex integral impeller can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of grinding and polishing, and in particular to a grinding method for a complex integral impeller. Background Art

[0002] Impeller parts are one of the more typical complex channel parts in the mechanical equipment industry. As key components of power machinery, they work in harsh conditions and are subject to complex stress and vibration. Their design and manufacturing often require knowledge of multiple disciplines such as fluid mechanics and tribology. Therefore, the overall working performance of impeller products is determined by their processing accuracy and processing quality. The grinding process of the entire impeller includes two steps: cutting and grinding and polishing. Grinding and polishing are used to improve the roughness of the impeller surface, which can effectively improve the smoothness of the impeller surface and improve product quality.

[0003] The grinding of the whole impeller with traditional technology is generally done by an abrasive flow polisher. For fields such as aviation and aerospace that require higher device precision, the impeller has a complex structure, uneven thickness and complex free-form surfaces. The abrasive flow polisher with a fixed abrasive entry speed is prone to abrasive scratches on the impeller surface during the later grinding process, causing problems with the overall impeller processing quality. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a grinding method for a complex integral impeller to solve the existing problems.

[0005] A grinding method for a complex integral impeller of the present application adopts the following technical solution: An embodiment of the present application provides a grinding method for a complex integral impeller, comprising the following steps: Obtain the feed rate of the abrasive flow polisher in each time period during the impeller grinding and polishing process, as well as the abrasive flow rate and impeller temperature at each sampling moment in each time period; For each time period, the impeller temperature and abrasive flow rate at all acquisition moments in the time period are divided into subsequences to obtain each temperature subsequence and each flow rate subsequence; the temperature oscillation value of each temperature subsequence is obtained through the temperature change deviation in each temperature subsequence; the flow rate variation degree of the abrasive flow polisher in each time period is obtained by combining the flow rate deviation in each flow rate subsequence and the temperature oscillation value of each temperature subsequence; The flow velocity variation in each time period is fitted, and the changing trend of the flow velocity variation is analyzed. Combined with the feed speed of the abrasive flow polisher in the current time period, the feed adjustment speed of the abrasive flow polisher in the current time period is obtained, and the feed valve during the impeller grinding process is adjusted.

[0006] Preferably, each temperature subsequence further includes: the temperatures at all acquisition moments in each time period are arranged in ascending time order to form a temperature sequence for each time period, and the temperature sequence is evenly divided into multiple subsequences, which are recorded as each temperature subsequence.

[0007] Preferably, each flow rate subsequence further includes: the grinding material flow rates at all collection moments in each time period are arranged in ascending time order to form a flow rate sequence for each time period, and the flow rate sequence is evenly divided into multiple subsequences, which are recorded as each flow rate subsequence.

[0008] Preferably, the expression of the temperature oscillation value of each temperature subsequence is: ; In the formula, represents the temperature oscillation value of the i-th temperature subsequence; Represents the number of temperatures in the temperature subsequence; represents the jth temperature value in the i-th temperature subsequence; It represents the value of the jth position in the temperature line obtained by fitting the i-th temperature subsequence; || indicates the absolute value sign.

[0009] Preferably, the expression for the flow velocity variation of the abrasive flow polisher in each time period is: ; In the formula, YV represents the flow velocity change of the abrasive flow polisher in the current time period; Indicates the mean value of all temperature oscillation values ​​corresponding to the current time period; represents the mean of the velocity average deviation sequence; r represents the correlation coefficient between the temperature oscillation value sequence and the velocity average deviation sequence; Represents a constant that prevents the denominator from being zero.

[0010] Preferably, the construction of the temperature oscillation value sequence further comprises: sorting the temperature oscillation values ​​of all temperature subsequences corresponding to the current time period according to the positions of the temperature subsequences to obtain the temperature oscillation value sequence of the current time period.

[0011] Preferably, the construction of the velocity average deviation sequence further includes: counting the average absolute deviation of each velocity subsequence in each time period, sorting the average absolute deviations of all velocity subsequences in each time period according to the position of the velocity subsequence, and obtaining the velocity average deviation sequence in each time period.

[0012] Preferably, the expression for the feed adjustment speed of the abrasive flow polisher in the current time period is: ; In the formula, Indicates the feed adjustment speed of the abrasive flow polisher in the current time period; The trend slope for the current time period; Represents a set of absolute values ​​of trend slopes for the current time period and all previous time periods; It represents the maximum value function; Indicates the feed rate of the abrasive flow polisher in the current time period; Represents a constant that prevents the denominator from being zero.

[0013] Preferably, the trend slope further includes: performing a straight line fitting on the flow velocity variation of the current time period and all previous time periods, recording the slope of the straight line as the trend slope of the current time period, wherein the trend slope of the first time period is set to 0.

[0014] Preferably, the expression of the opening of the feed valve after adjustment is: ; In the formula, To adjust the opening of the rear feed valve; is the opening of the feed valve in the current time period; is the feed rate of the abrasive flow polisher in the current time period; Indicates the feed adjustment speed of the abrasive flow polisher in the current time period.

[0015] This application has at least the following beneficial effects: The present application aims at the limitations of the existing technology for the grinding processing method of complex integral impellers, and the processing quality problems caused by the complexity of the impeller structure and the diversity of material properties. The present application is based on a complex integral impeller grinding processing method based on sensor data acquisition and intelligent control. By real-time acquisition of the operating data of an abrasive flow polisher, the temperature changes and flow velocity fluctuations during the grinding process are analyzed to construct a temperature oscillation value sequence to characterize the changes in the surface roughness of the impeller; a flow velocity average deviation sequence is constructed through the flow velocity changes of the abrasive flow polisher to characterize the changes in the friction between the abrasive and the impeller surface; the flow velocity variation degree is calculated by combining the temperature oscillation value sequence and the flow velocity average deviation sequence to evaluate the relationship between the impeller surface state and the abrasive state during the grinding process, thereby determining the changes in the impeller surface roughness; the feed adjustment speed of the abrasive flow polisher in the current time period is calculated through the flow velocity variation degree, thereby realizing intelligent adjustment of the complex integral impeller grinding processing process, thereby improving the surface quality and processing efficiency of the impeller under various processing conditions. Therefore, the present application avoids the processing quality problems caused by the structural complexity and diversity of material properties in the complex integral impeller grinding processing method in the prior art, and can effectively improve the processing quality and efficiency of the complex integral impeller, making the grinding processing of the complex integral impeller more intelligent and precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A flowchart of the steps of a grinding method for a complex integral impeller provided in this application. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the grinding method for a complex integral impeller proposed in the present application, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0019] Unless otherwise defined, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the article or device comprising the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present application belongs.

[0020] A specific solution of a grinding method for a complex integral impeller provided in the present application is described in detail below in conjunction with the accompanying drawings.

[0021] An embodiment of the present application provides a grinding method for a complex integral impeller. For details, please refer to Figure 1 , including the following steps: Step 1: Obtain the feed rate of the abrasive flow polisher in each time period during the impeller grinding and polishing process, as well as the abrasive flow rate and impeller temperature at each sampling moment in each time period.

[0022] For the grinding of the integral impeller, there are two steps in this embodiment: S1. Cutting: This embodiment processes the blade-shaped five-axis machine tool data, and the tool collects the ball-end taper milling cutter to cut the device raw material, and uses VERICUT software for simulation. The ball-end taper milling cutter includes two main structures: a shank and a taper tool body. The taper tool body is provided with a number of conical cutting edges, which are spiral, and the helix angle of the conical cutting edge is 30°; the bottom of the taper tool body is spherical, and a positioning groove is provided. Two cutting edges are provided on the spherical surface. The cutting edges spiral upward on the conical surface, and spiral chip grooves are provided under the cutting edges. The spiral chip grooves are provided with a clean edge, and the clean edge is provided with a ridge; there is a step between the tool body and the shank, which is conical; S2. Grinding and polishing: In this embodiment, the abrasive diameter of the abrasive flow polisher is 0.425 mm, the grinding medium is SiC (silicon carbide), the initial working pressure is 4 MPa, the coolant is water, the grinding and polishing time is 20 min, and the initial feeding speed is 0.5 s / m. The setting of each parameter in the grinding and polishing process can be set by the implementer in the actual application process, and this embodiment does not impose any special restrictions on this.

[0023] During the grinding and polishing process, the temperature of the entire impeller is obtained by the semi-artificial thermocouple method; the flow rate of the grinding material in the grinding chamber is measured by the electromagnetic flowmeter. For data collection, in this embodiment, the frequency of data collection is 10Hz, and every 1 minute is regarded as a time period. For the data collected in each time period, the temperatures of all the collection moments in the time period are arranged in ascending order of time to form a temperature sequence of each time period, and accordingly, the flow rate sequence is obtained. The calculation process of the semi-artificial thermocouple method is a well-known technology, and the specific calculation process will not be repeated.

[0024] Step 2: For each time period, the impeller temperature and abrasive flow rate at all sampling moments within the time period are divided into subsequences to obtain temperature subsequences and flow rate subsequences; the temperature oscillation value of each temperature subsequence is obtained through the temperature change deviation in each temperature subsequence; the flow rate variation of the abrasive flow polisher in each time period is obtained by combining the flow rate deviation in each flow rate subsequence and the temperature oscillation value of each temperature subsequence.

[0025] When the impeller is put into the abrasive flow polisher for grinding, the abrasive in the grinding chamber continuously flows and forms friction with the impeller surface, which removes the material on the impeller surface and makes the impeller surface smoother. Since friction generates heat, the temperature of the impeller surface will continue to increase, but due to the different roughness of the surfaces of the impeller blades, the friction between the abrasive and the blades is also different, causing the temperature rise of the impeller surface to not rise linearly, but with nonlinear characteristics.

[0026] During grinding, the overall trend of the impeller temperature is to rise continuously due to the friction between the abrasive and the impeller surface. In the early stage of grinding, due to the large roughness of the impeller surface, the friction between the abrasive and the impeller is also large, so the impeller temperature rises faster. As the grinding progresses, the roughness of the impeller surface continues to decrease, and the friction between the abrasive and the impeller also continues to decrease, which reduces the temperature rise of the impeller, and the temperature rise tends to the same value within the same time.

[0027] Based on the above analysis, for each time period, the current time period is taken as an example for detailed description in this embodiment. Specifically, the temperature sequence of the current time period is evenly divided into N temperature subsequences, and N is 20 in this embodiment. Further, the temperature in the temperature subsequence is linearly fitted to obtain a temperature straight line. Preferably, in this embodiment, the first temperature value and the last temperature value are obtained through a two-point equation of a straight line to obtain a temperature straight line. According to the temperature change of the temperature straight line, the temperature oscillation value of each temperature subsequence is calculated. In this embodiment, the specific calculation formula is: ; In the formula, represents the temperature oscillation value of the i-th temperature subsequence; Represents the number of temperatures in the temperature subsequence; represents the jth temperature value in the i-th temperature subsequence; It represents the value of the jth position in the temperature line obtained by fitting the i-th temperature subsequence; || indicates the absolute value sign.

[0028] When the abrasive flow polisher is grinding the whole impeller, the friction between the abrasive and the impeller surface is large due to the high roughness of the whole impeller surface. Due to the uneven distribution of the roughness of the impeller surface, the impeller temperature rises at different values ​​in the same time, which makes the difference between the impeller temperature and the temperature line. The value of increases, making the temperature oscillation value of the impeller temperature subsequence The value increases. It is necessary to increase the entry of coolant so that the coolant can flow quickly and take away the heat from the impeller surface.

[0029] Furthermore, in the later stage of impeller grinding, due to the reduction of the roughness of the impeller surface, the friction between the grinding material and the impeller decreases and tends to be stable, which will cause the rate of impeller temperature rise to slow down. Without considering the heat taken away by the coolant, the temperature rise tends to be stable in the same time. However, due to the continuous entry of the coolant, the coolant will take away the heat on the impeller surface, so the temperature oscillation value of the impeller at the same time will approach 0.

[0030] Due to the friction between the abrasive and the impeller surface, the kinetic energy of the abrasive is converted into heat on the impeller surface, which causes the abrasive speed to decrease. In the early stage of grinding, due to the different roughness of each position on the impeller surface, the change of the abrasive speed in the grinding chamber oscillates, and the relationship between the change of the impeller surface temperature decreases. In the later stage of grinding, the roughness of each position on the impeller surface decreases and tends to the same value, so there is a strong correlation between the flow rate within the grinding intensity and the impeller surface temperature.

[0031] Based on the above analysis, the collected flow velocity sequence of the grinding material in the abrasive flow polisher is evenly divided into N subsequences, and then the average absolute deviation of each flow velocity subsequence is obtained, and the average absolute deviation of all flow velocity subsequences corresponding to the current time period is sorted according to the position of the flow velocity subsequence to obtain the flow velocity average deviation sequence of the current time period, and the temperature oscillation values ​​of all temperature subsequences corresponding to the current time period are sorted according to the position of the temperature subsequence to obtain the temperature oscillation value sequence of the current time period.

[0032] Furthermore, the temperature oscillation value sequence and the velocity average deviation sequence are used as inputs of the grey correlation analysis algorithm, and the output is the correlation coefficient r between the temperature oscillation value sequence and the velocity average deviation sequence. Thus, the velocity variation of the abrasive flow polisher is calculated. In this embodiment, the specific calculation formula is: ; In the formula, YV represents the flow velocity change of the abrasive flow polisher in the current time period; Indicates the mean value of all temperature oscillation values ​​corresponding to the current time period; represents the mean of the velocity average deviation sequence; r represents the correlation coefficient between the temperature oscillation value sequence and the velocity average deviation sequence; Indicates a constant to prevent the denominator from being zero, with a value range of 0 to 1. In this embodiment, the value is 0.1.

[0033] In the early stage of grinding the whole impeller, the roughness of the impeller surface is relatively high. During the grinding process, the friction between the abrasive and the impeller surface is relatively large, and the heat energy generated is relatively large. Therefore, the average value of all temperature oscillation values ​​will be The value of is large, and the flow rate of the grinding material will decrease due to friction, making the flow rate deviate from the mean of all elements in the sequence. The difference in the roughness of the impeller surface in the early stage causes a large change in the temperature of the impeller, and the flow rate of the abrasive changes greatly, so the relationship between the two parameters is relatively low; in the later stage of grinding, the smoothness of the impeller surface is improved, the friction between the abrasive and the impeller surface is reduced, and the magnitude of the friction is relatively stable, so the impeller surface temperature is relatively stable (there is cooling material to take away the heat), so the change in flow rate is also relatively stable, and the correlation coefficient r between the two parameters is larger than the correlation coefficient in the early stage of grinding. Therefore, the value of the flow rate variation degree YV of the abrasive flow polisher obtained in the early stage is larger, and the value of the flow rate variation degree YV in the later stage is smaller, in order to grind the impeller more finely, thereby reducing the pressure of the grinder, so that the grinding of the impeller can be carried out smoothly.

[0034] Step 3: Fit the flow velocity variation in each time period, analyze the changing trend of the flow velocity variation, combine the feed speed of the abrasive flow polisher in the current time period, obtain the feed adjustment speed of the abrasive flow polisher in the current time period, and adjust the feed valve during the impeller grinding process.

[0035] During the overall grinding process, the roughness of the impeller surface is continuously reduced. When the roughness is low, a higher flow rate of abrasive should be used to grind the impeller. However, it is necessary to prevent the abrasive speed from being too fast, which may cause serious abrasive scratches on the impeller surface and cause problems with the grinding quality of the impeller.

[0036] Under normal circumstances, the surface roughness of the impeller decreases with the progress of grinding time, and the flow rate of the abrasive flow polisher changes accordingly. The value of is decreasing, showing a downward trend. Therefore, in order to reduce the possibility of abrasive scratches on the impeller surface in the later stage, the grinding intensity pressure should be reduced, and the entry speed of the abrasive should also be continuously reduced over time.

[0037] Based on the above analysis, a straight line fitting is performed for the velocity variation of the current time period and all previous time periods. In this embodiment, the velocity variation of the current time period and all previous time periods is used as the input of the least square method to obtain a fitting straight line, and the slope of the fitting straight line is calculated and recorded as the trend slope of the current time period. Among them, considering that there is only one time period in the first time period, fitting cannot be performed, so the trend slope of the first time period is set to 0. Among them, the process of fitting a straight line by the least square method is a well-known technology, and the specific calculation process will not be repeated.

[0038] Thus, the feed speed of the abrasive flow polisher is adjusted by changing the slope in different time periods. Based on the trend slope of each time period and the maximum value of the trend slope of each time period and multiple time periods before it, combined with the feed speed of the abrasive flow polisher in each time period, the feed adjustment speed of the abrasive flow polisher in the current time period is obtained. In this embodiment, the specific calculation formula is: ; In the formula, Indicates the feed adjustment speed of the abrasive flow polisher in the current time period; The trend slope for the current time period; Represents a set of absolute values ​​of trend slopes for the current time period and all previous time periods; It represents the maximum value function; Indicates the feed speed of the abrasive flow polisher in the current time period, wherein, during grinding and polishing, the initial feed speed of the abrasive flow polisher in this embodiment is set to 0.5 m / s; It represents a constant to prevent the denominator from being zero, and its value range is 0 to 1. In this embodiment, its value is 0.1.

[0039] As the abrasive flow polisher continuously grinds the entire impeller, the smoothness of the impeller surface improves. During the impeller grinding process, in order to prevent the abrasive from scratching the impeller surface, the pressure in the grinding chamber needs to be reduced. To adjust the pressure in the grinding chamber, it is necessary to adjust the entry rate of the abrasive. When grinding normally, the flow rate change of the abrasive flow polisher continues to decrease, and the value of the decrease continues to decrease, which makes the trend slope of the abrasive flow polisher at different times negative, making the The value is less than 1, which makes the feed adjustment speed of the abrasive flow polisher A smaller value can reduce the entry rate of the abrasive and grind the impeller more finely.

[0040] The feed port rate of the abrasive flow polisher is adjusted according to the feed adjustment speed and the actual feed speed of the abrasive flow polisher in the current time period. By analyzing the feed adjustment speed and the actual feed rate and the feed valve opening in the current time period, the opening of the feed valve after adjustment is accurately calculated. In this embodiment, specifically, the calculation formula for the opening of the feed valve after adjustment is: ; In the formula, To adjust the opening of the rear feed valve, is the opening of the feed valve in the current time period, is the feed rate of the abrasive flow polisher in the current time period, Indicates the feed adjustment speed of the abrasive flow polisher in the current time period.

[0041] The feed valve is adjusted according to the obtained opening of the feed valve, thereby realizing dynamic adjustment of the feed speed. This proportional adjustment mechanism not only ensures the stability and consistency of the feed speed, but also improves the response speed and flexibility of the entire grinding and polishing process.

[0042] It is understood that references to "one embodiment" or "some embodiments" etc. described in the specification of the present application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, if "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appear in different places in this specification, they do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0043] It should be noted that the sequence of the above-mentioned embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. In addition, the process depicted in the accompanying drawings does not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-tasking and parallel processing are also possible or may be advantageous. At the same time, the size of the sequence number of each step in the embodiment does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments in this specification.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A grinding method for a complex integral impeller, characterized in that: The following steps are involved: Obtain the feed rate of the abrasive flow polisher in each time period during the impeller grinding and polishing process, as well as the abrasive flow rate and impeller temperature at each sampling moment in each time period; For each time period, the impeller temperature and abrasive flow rate at all acquisition moments in the time period are divided into subsequences to obtain each temperature subsequence and each flow rate subsequence; the temperature oscillation value of each temperature subsequence is obtained through the temperature change deviation in each temperature subsequence; the flow rate variation degree of the abrasive flow polisher in each time period is obtained by combining the flow rate deviation in each flow rate subsequence and the temperature oscillation value of each temperature subsequence; The flow velocity variation in each time period is fitted, and the changing trend of the flow velocity variation is analyzed. Combined with the feed speed of the abrasive flow polisher in the current time period, the feed adjustment speed of the abrasive flow polisher in the current time period is obtained, and the feed valve during the impeller grinding process is adjusted.

2. A grinding method for a complex integral impeller according to claim 1, characterized in that: Each temperature subsequence further includes: the temperatures of all acquisition moments in each time period are arranged in ascending time order to form a temperature sequence of each time period, and the temperature sequence is evenly divided into multiple subsequences, which are recorded as each temperature subsequence.

3. A grinding method for a complex integral impeller according to claim 1, characterized in that: Each flow rate subsequence further includes: the grinding material flow rates at all collection moments in each time period are arranged in ascending time order to form a flow rate sequence for each time period, and the flow rate sequence is evenly divided into multiple subsequences, which are recorded as each flow rate subsequence.

4. A grinding method for a complex integral impeller according to claim 1, characterized in that: The expression of the temperature oscillation value of each temperature subsequence is: ; In the formula, represents the temperature oscillation value of the i-th temperature subsequence; Represents the number of temperatures in the temperature subsequence; represents the jth temperature value in the i-th temperature subsequence; It represents the value of the jth position in the temperature line obtained by fitting the i-th temperature subsequence; || indicates the absolute value sign.

5. A grinding method for a complex integral impeller according to claim 1, characterized in that: The expression of the flow velocity variation of the abrasive flow polisher in each time period is: ; In the formula, YV represents the flow velocity change of the abrasive flow polisher in the current time period; Indicates the mean value of all temperature oscillation values ​​corresponding to the current time period; represents the mean of the velocity average deviation sequence; r represents the correlation coefficient between the temperature oscillation value sequence and the velocity average deviation sequence; Represents a constant that prevents the denominator from being zero.

6. A grinding method for a complex integral impeller according to claim 5, characterized in that: The construction of the temperature oscillation value sequence further includes: sorting the temperature oscillation values ​​of all temperature subsequences corresponding to the current time period according to the positions of the temperature subsequences to obtain the temperature oscillation value sequence of the current time period.

7. A grinding method for a complex integral impeller according to claim 5, characterized in that: The construction of the velocity average deviation sequence further includes: counting the average absolute deviation of each velocity subsequence in each time period, sorting the average absolute deviations of all velocity subsequences in each time period according to the positions of the velocity subsequences, and obtaining the velocity average deviation sequence in each time period.

8. A grinding method for a complex integral impeller according to claim 1, characterized in that: The expression of the feed adjustment speed of the abrasive flow polisher in the current time period is: ; In the formula, Indicates the feed adjustment speed of the abrasive flow polisher in the current time period; The trend slope for the current time period; Represents a set of absolute values ​​of trend slopes for the current time period and all previous time periods; represents the maximum value function; Indicates the feed rate of the abrasive flow polisher in the current time period; Represents a constant that prevents the denominator from being zero.

9. A grinding method for a complex integral impeller according to claim 8, characterized in that: The trend slope further includes: performing a straight line fitting on the flow velocity variation of the current time period and all previous time periods, recording the straight line slope as the trend slope of the current time period, wherein the trend slope of the first time period is set to 0.

10. A grinding method for a complex integral impeller according to claim 1, characterized in that: The expression of the opening of the feed valve after adjustment is: ; In the formula, To adjust the opening of the rear feed valve; is the opening of the feed valve in the current time period; is the feed rate of the abrasive flow polisher in the current time period; Indicates the feed adjustment speed of the abrasive flow polisher in the current time period.

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