Liquid adding method for cutting processing

Abstract

This application relates to a liquid addition method for cutting processes. The liquid addition method for cutting processes includes: adding circulating fluid to a storage tank; adding coolant to the storage tank; obtaining a mixture in the storage tank; during the cutting process, replenishing the storage tank with circulating fluid to maintain a preset overflow rate of the mixture; and during the cutting process, replenishing the mixture with coolant in stages to ensure that the cutting breakage rate does not exceed a preset value. This application employs a combination of replenishing circulating fluid to form an overflow and adding coolant in stages. By replenishing the storage tank with circulating fluid, the mixture can maintain a preset overflow rate, significantly reducing the silicon powder concentration in the mixture within the storage tank. During the overflow process of replenishing the mixture with circulating fluid, the coolant is replenished in stages, slowing down the loss of coolant from the storage tank. This ensures that the mixture maintains good lubricity at different stages of the cutting process, mitigating abnormal breakage rates during cutting.

Description

Technical Field

[0001] This application relates to the field of cutting and processing technology, and in particular to a liquid addition method for cutting and processing. Background Technology

[0002] With the continuous development of the photovoltaic industry, silicon wafer cutting is mostly carried out using diamond wire cutting. During the diamond wire cutting process, water and coolant need to be added to cool the cutting position.

[0003] The traditional cooling method for diamond wire cutting involves adding coolant and water into a storage tank before cutting to form a mixture. The mixture is then sprayed onto the cutting position and flows back into the storage tank, circulating throughout the machine for cutting.

[0004] However, during the cutting process, silicon powder continuously enters the mixture, causing its concentration to rise continuously. This results in a decrease in the cutting force of the crystal rod in the later stages, making it prone to abnormal wire breakage rates. Furthermore, it generates a large amount of wastewater in the storage tank, which is difficult to treat. Adding water to the storage tank will cause coolant loss, also leading to abnormal wire breakage rates. Summary of the Invention

[0005] Therefore, it is necessary to provide a liquid addition method for cutting and processing, which addresses the problem that the concentration of silicon powder in the mixed liquid in the storage tank tends to rise continuously during the cutting process, leading to abnormal wire breakage rates.

[0006] An embodiment of the first aspect of this application provides a liquid addition method for cutting processes, the liquid addition method for cutting processes comprising:

[0007] Add the circulating fluid into the storage tank;

[0008] Add coolant into the reservoir;

[0009] Obtain the mixture in the storage tank;

[0010] During the cutting process, the circulating liquid is added to the storage tank to maintain the preset overflow rate of the mixture;

[0011] During the cutting process, the coolant is added to the mixture in several batches to ensure that the cutting breakage rate does not exceed a preset value.

[0012] In one embodiment, replenishing the storage tank with the circulating liquid to maintain a preset overflow rate of the mixture includes:

[0013] The total amount of coolant to be added during a single addition is determined based on the total cutting depth of the workpiece to be cut and the volume of the reservoir.

[0014] Based on the total amount of coolant added during a single addition, the breakage rate corresponding to different overflow rates was measured.

[0015] The preset overflow rate is determined based on the disconnection rate corresponding to different overflow rates;

[0016] The circulating fluid is continuously replenished into the storage tank according to the preset overflow rate.

[0017] In one embodiment, when the total amount of coolant added is 2L-3L, the preset overflow rate is 250ml / h-350ml / h.

[0018] In one embodiment, adding coolant to the reservoir includes:

[0019] The amount of coolant added to the storage tank is the initial addition amount.

[0020] The initial liquid addition volume is determined based on the breakage rate corresponding to different initial liquid addition volumes;

[0021] The coolant is added to the storage tank according to the initial addition volume.

[0022] In one embodiment, determining the initial liquid addition amount based on the breakage rate corresponding to different initial liquid addition amounts further includes:

[0023] The initial liquid addition volume is 68%-72% of the total coolant volume.

[0024] In one embodiment, the coolant is added to the mixture in stages, including:

[0025] Determine the total cutting time based on the total cutting depth of the workpiece to be cut;

[0026] Based on the total cutting time, the coolant is added to the mixture in two batches.

[0027] In one embodiment, the coolant is added to the mixture in two stages, including:

[0028] The moment when the coolant is first added to the mixture is defined as the first preset moment, and the ratio of the time interval between the first preset moment and the start of cutting to the total cutting time is 35%-40%.

[0029] The time when the coolant is added to the mixture for the second time is the second preset time. The ratio of the time interval between the second preset time and the start time of cutting to the total cutting time is in the range of 72%-77%.

[0030] In one embodiment, adding the coolant to the mixture in stages further includes:

[0031] The amount of coolant added to the mixture each time is called the replenishment volume.

[0032] The amount of replenishing liquid is determined based on the breakage rate, TTV, and line marks corresponding to different replenishing liquid volumes;

[0033] The mixture is replenished in several batches according to the stated replenishment volume.

[0034] In one embodiment, adding the coolant to the mixture in stages further includes:

[0035] Based on the break rate corresponding to different replenishment volumes, obtain the break change trend curve of the replenishment volume;

[0036] Based on the trend curve of the change in the amount of replenished liquid, determine the inflection point of the increase in the disconnection rate;

[0037] The time for replenishing the mixture according to the stated replenishment amount is earlier than the time corresponding to the inflection point of the line breakage rate increase in the corresponding time period.

[0038] In one embodiment, replenishing the coolant into the reservoir in stages further includes:

[0039] If any abnormality occurs during the cutting process, a compensation liquid amount will be added to the mixture at preset abnormality intervals.

[0040] The ratio of the preset abnormal time to the total cutting time is 35%-40%, the ratio of the compensation liquid addition to the total coolant addition is 7%-9%, and the abnormal conditions of the cutting process include abnormally high wire breakage rate, abnormally high TTV, or abnormally high wire mark.

[0041] The above-mentioned liquid addition method for cutting processes combines replenishing circulating fluid to form an overflow with adding coolant in stages. By replenishing the reservoir with circulating fluid, the mixture can maintain a preset overflow rate, thereby significantly reducing the silicon powder concentration in the mixture within the reservoir. During the overflow process of the mixture by replenishing circulating fluid, the coolant in the mixture will continuously be lost along with the overflow, and the proportion of circulating fluid in the mixture increases, while the proportion of coolant in the mixture decreases accordingly. Replenishing the coolant in stages can slow down the loss of coolant in the reservoir with the overflow of circulating fluid, increase the proportion of coolant in the mixture, and ensure that the mixture maintains good lubricity at different stages of the cutting process, thus reducing the abnormal wire breakage rate during the cutting process. Attached Figure Description

[0042] Figure 1 This is a schematic flowchart of the liquid addition method for cutting and processing according to an embodiment of this application.

[0043] Figure 2 This is a schematic diagram illustrating the liquid addition and overflow principle of the liquid addition method for cutting and processing according to an embodiment of this application.

[0044] Figure 3 This is a schematic diagram illustrating the relationship between cutting depth and wire breakage rate when adding coolant in a single step according to an embodiment of this application.

[0045] Figure 4 This is a schematic diagram showing the relationship between different preset overflow rates and wire breakage rates in the liquid addition method for cutting processes according to embodiments of this application.

[0046] Figure 5 This diagram illustrates the relationship between different initial liquid addition amounts and wire breakage rates in the liquid addition methods for cutting processes according to embodiments of this application.

[0047] Figure 6 This diagram illustrates the relationship between different amounts of additional liquid added and the breakage rate in the liquid addition method for cutting processes according to embodiments of this application.

[0048] Figure 7 This diagram illustrates the relationship between different amounts of additional liquid added and TTV and line marks in the liquid addition method for cutting processes according to embodiments of this application.

[0049] In the picture:

[0050] 1. Liquid storage tank; 2. Liquid inlet; 3. Overflow outlet. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0052] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0057] First, it should be noted that wire breakage refers to the phenomenon of diamond wire breaking during the cutting process. The wire breakage rate is the ratio of the number of wire breakages to the total number of cutting cuts. It is an important indicator for diamond wire cutting and is provided as a reference for the following content.

[0058] See Figure 1 , Figure 1The diagram shows a flow chart of a liquid addition method for cutting processes according to an embodiment of this application. The liquid addition method for cutting processes provided in an embodiment of this application includes:

[0059] Add the circulating fluid into the storage tank 1;

[0060] Add coolant to reservoir 1;

[0061] A mixed liquid is obtained in the storage tank 1, that is, the circulating liquid is mixed with the storage tank 1 to form a mixed liquid.

[0062] During the cutting process, circulating fluid is added to the storage tank 1 to maintain the preset overflow flow rate of the mixture. That is, during the process of adding circulating fluid to the storage tank 1, the volume of the storage tank 1 is a constant value. When the volume of the mixture exceeds the volume of the storage tank 1, the mixture will overflow from the overflow position of the storage tank 1. The content of clean circulating fluid in the storage tank 1 increases, and silicon powder flows out with the overflow of the mixture, thereby significantly reducing the silicon powder concentration in the mixture in the storage tank 1.

[0063] During the cutting process, coolant is added to the mixture in stages to ensure that the cutting breakage rate does not exceed a preset value. That is, during the process of replenishing the circulating fluid to form the overflow of the mixture, the coolant in the mixture will be continuously lost with the overflow process, and the proportion of circulating fluid in the mixture increases, while the proportion of coolant in the mixture decreases accordingly. Replenishing the coolant to the mixture in stages can slow down the loss of coolant in the reservoir 1 with the overflow of circulating fluid, increase the proportion of coolant in the mixture, and enable the mixture to maintain good lubricity at different stages of the cutting process, so as to ensure that the cutting breakage rate does not exceed the preset value and reduce the abnormal breakage rate during the cutting process.

[0064] With this configuration, this embodiment combines replenishing circulating fluid to form an overflow with adding coolant in stages. This significantly reduces the silicon powder concentration in the mixture while maintaining good lubricity of the mixture at different stages of the cutting process. It also reduces the abnormal wire breakage rate during the cutting process and solves the problem that the silicon powder concentration in the mixture in the storage tank tends to rise continuously during the cutting process, which can easily lead to abnormal wire breakage rate.

[0065] In this embodiment, the liquid storage tank 1 may be provided with an inlet 2 and an overflow port 3. One or two inlets 2 may be provided for adding circulating liquid and coolant, and the overflow port 3 may be used for discharging the mixed liquid. The circulating liquid may be, but is not limited to, water, and can be selected according to actual needs. The preset value for the wire breakage rate can be selected as 8.5%-9.5%, and the specific selectable values ​​may be, but are not limited to, 8.5%, 8.95%, or 9.5%.

[0066] See Figure 2-3In some embodiments, circulating fluid is added to the storage tank 1 to maintain a preset overflow rate of the mixture, including:

[0067] Based on the total cutting depth of the workpiece to be cut and the volume of the reservoir 1, the total amount of coolant to be added in a single operation is determined. That is, the amount of coolant to be added in a single operation required to complete the cutting of the workpiece without multiple additions can be used as the total amount of coolant to be added. The total amount of coolant to be added can be obtained based on empirical values ​​or by simulation using artificial network models or mathematical models.

[0068] Using the total amount of coolant added during a single addition as a benchmark, the breakage rate corresponding to different overflow rates was measured. That is, with other conditions unchanged, the overflow rate was used as a single variable for experimental measurement to obtain the breakage rate of diamond wire cutting under different overflow rates.

[0069] Based on the disconnection rate corresponding to different overflow rates, the preset overflow rate is determined. That is, by comparing the disconnection rates corresponding to different overflow rates, the overflow rate corresponding to the lowest disconnection rate can be selected as the preset overflow rate.

[0070] According to the preset overflow rate, the circulating fluid is continuously replenished into the storage tank 1.

[0071] This setup, with a preset overflow rate, continuously replenishes the circulating fluid into the storage tank 1, which can reduce the concentration of silicon powder in the mixture while slowing down the excessive loss of coolant content in the mixture, allowing the mixture to maintain good lubricity and reducing abnormal wire breakage rates during the cutting process.

[0072] Combination Figure 4 As shown, Figure 2 The diagram illustrates the relationship between different preset overflow rates and wire breakage rates in the coolant addition method for cutting processes according to one embodiment of this application. In some embodiments, when the total coolant addition volume is 2L-3L, the preset overflow rate is 250ml / h-350ml / h. That is, when the total coolant addition volume is 2L-3L in a single addition, setting the preset overflow rate to 250ml / h-350ml / h can keep the wire breakage rate at a low level.

[0073] In this embodiment, the total amount of coolant added at one time can be selected as 2.5L, and the preset overflow rate can be selected as 300ml / h, which can be applied to the cutting of crystal rods of conventional sizes with a total cutting depth of 180mm-200mm.

[0074] See Figure 5 In some embodiments, adding coolant to the reservoir 1 includes:

[0075] The amount of coolant added to the reservoir 1 is the initial addition amount;

[0076] The initial liquid addition amount is determined based on the breakage rate corresponding to different initial liquid addition amounts. That is, the breakage rate of diamond wire cutting corresponding to different initial liquid addition amounts is obtained, and the breakage rate corresponding to different initial liquid addition amounts is compared. The initial liquid addition amount corresponding to the lower breakage rate is selected as the final determined initial liquid addition amount.

[0077] Add the coolant into the reservoir 1 according to the final determined initial addition volume.

[0078] With this setup, adding coolant to the reservoir 1 according to the initial addition amount ensures good lubricity of the mixture in the early stages of cutting, reducing abnormal wire breakage during the cutting process. Compared to adding all the coolant at once, this embodiment allows for maintaining a stable low wire breakage rate by adding the initial amount first, thus reducing excessive coolant loss and minimizing coolant waste.

[0079] In some embodiments, determining the initial liquid addition volume based on the breakage rate corresponding to different initial liquid addition volumes further includes:

[0080] The initial coolant addition should be 68%-72% of the total coolant volume. Within this range, the mixture maintains good lubricity in the initial stages of cutting, keeping the wire breakage rate stable at a low level and mitigating abnormal wire breakage during the cutting process. For example, if the total coolant volume for a single addition is 2.5L, the initial addition volume can be 1.7L-1.8L, or specifically 1.7L, 1.75L, or 1.8L.

[0081] See Figure 6-7 In some embodiments, the coolant is added to the mixture in stages, including:

[0082] The total cutting time is determined based on the total cutting depth of the workpiece to be cut. In other words, the total cutting time can be estimated based on empirical values ​​or simulated based on mathematical or artificial intelligence models using the total cutting depth of the workpiece.

[0083] Based on the total cutting time, the coolant is added to the mixture in two batches.

[0084] This configuration allows for the addition of coolant to the mixture twice during different stages of the cutting process. This effectively replenishes the coolant lost from the mixture, maintaining good lubricity and mitigating abnormal wire breakage rates during the corresponding periods.

[0085] In some embodiments, adding coolant to the mixture in two stages includes:

[0086] The first preset time is the moment when coolant is first added to the mixture. The ratio of the time interval between the first preset time and the start of cutting to the total cutting time is 35%-40%. After adding coolant according to the initial amount, the wire breakage rate can be kept at a low level until the first preset time. By adding coolant for the first time at the first preset time, the coolant in the mixture can be replenished in time, improving lubrication and slowing down the abnormal wire breakage rate. It can also reduce the loss of coolant during the overflow process of circulating fluid, thus saving the amount of coolant used.

[0087] The second preset time is the time when the coolant is added to the mixture for the second time. The ratio of the time interval between the second preset time and the start time of cutting to the total cutting time is 72%-77%. That is, based on the first time the mixture is added, the second time the coolant is added to the mixture in a timely manner, which can reduce the abnormal wire breakage rate and reduce the loss of coolant during the overflow process of the circulating fluid, thus saving the amount of coolant used.

[0088] For example, when cutting a crystal rod with a total cutting depth in the range of 180mm-190mm, the total cutting time can be 110min. The first preset time can be selected in the range of 40min-45min after the start of cutting, and the second preset time can be selected in the range of 80min-85min after the start of cutting.

[0089] In some embodiments, adding coolant to the mixture in stages further includes:

[0090] The amount of coolant added to the mixture each time is called the replenishment volume.

[0091] The amount of additional liquid added is determined based on the breakage rate, TTV (Total Thickness Variation), and line marks corresponding to different amounts of additional liquid. This involves obtaining the breakage rate, TTV, and line marks corresponding to different amounts of additional liquid, and selecting the amount of additional liquid added corresponding to the lowest possible breakage rate, TTV, and line marks as the final amount of additional liquid added. Here, TTV refers to the difference between the maximum and minimum thickness of the workpiece in the thickness measurement, also known as the total thickness deviation of the workpiece.

[0092] By adding the mixture in stages according to the final replenishment volume, the breakage rate, TTV, and wire marks can be kept at a low level, and the amount of coolant used can also be reduced.

[0093] It should be noted that, in order to keep the breakage rate, TTV, and wire marks at a low level, the amount of coolant added should be 8% of the total coolant volume. If the amount of coolant added is greater than 8% of the total coolant volume, the abnormal values ​​of TTV and wire marks will increase significantly.

[0094] In some embodiments, adding coolant to the mixture in stages further includes:

[0095] Based on the break-line rate corresponding to different replenishment volumes, obtain the trend curve of break-line change in replenishment volume, i.e., refer to... Figure 6 The breakage rate corresponding to the change of different replenishment liquid volume with the cutting depth can be obtained by experimental measurement or mathematical model simulation, so as to draw the breakage change trend curve of replenishment liquid volume, so as to intuitively observe the change of breakage rate with different replenishment liquid volume.

[0096] Based on the trend curve of the change in the amount of liquid added, determine the inflection point of the increase in the breakage rate, that is, the turning point where the breakage rate increases significantly.

[0097] The coolant in the mixture is replenished in stages according to the replenishment amount, and the timing is earlier than the time corresponding to the inflection point of the breakage rate increase in the corresponding period. This can effectively slow down the abnormal increase in the breakage rate by replenishing the coolant in the mixture according to the replenishment amount in time before the time corresponding to the inflection point of the breakage rate increase in the corresponding period.

[0098] In some embodiments, replenishing the coolant into the reservoir 1 in stages further includes:

[0099] If any abnormality occurs during the cutting process, a compensation fluid will be added to the mixture at preset abnormality intervals to replenish the coolant content in the mixture, improve the lubricity of the mixture, and promptly alleviate the abnormality in the cutting process.

[0100] The ratio of the preset abnormal time to the total cutting time ranges from 35% to 40%, and the ratio of the compensation fluid volume to the total coolant volume ranges from 7% to 9%. This means that coolant is added at preset abnormal time intervals according to the compensation fluid volume, which effectively mitigates cutting abnormalities and saves coolant usage. Cutting abnormalities include abnormally high wire breakage rate, abnormally high TTV (Total Temperature Volume), or abnormally high wire mark rate. Optionally, if the total cutting time is 110 minutes and the total coolant volume is 2.5L, 0.2L of coolant can be added to the mixture every 40 minutes as compensation.

[0101] In summary, a specific example will be used to illustrate this, as follows:

[0102] Taking a crystal rod with a total cutting depth of 190mm as an example, the total cutting time can be 110 minutes. Based on a minimum initial coolant addition of 2.5L, the optimal preset overflow rate corresponding to a lower breakage rate can be selected as 250ml / h-350ml / h. Depending on the breakage rate corresponding to different initial coolant addition volumes, an initial coolant addition volume of 1.7L is selected to maintain a stable breakage rate. Cutting time was 40 minutes for depths between 0mm and 90mm, 45 minutes for depths between 0mm and 100mm, and 70 minutes for depths between 90mm and 180mm. Based on the trend curve of the breakage rate after replenishment, the breakage rate significantly increased at a cutting depth of 100mm, forming an inflection point. To allow time for the coolant and circulating fluid to mix evenly, a compensation of 0.2L was added 40-45 minutes after the start of cutting, earlier than the inflection point at the 100mm cutting depth, to mitigate the abnormal increase in breakage rate. After the first replenishment, the breakage rate again significantly increased to a high level at a cutting depth of 180mm, forming another inflection point. The cutting time from 90mm to 180mm was 50 minutes, basically consistent with the verification data of coolant loss and breakage rate increase during the initial cutting depth range of 0mm-100mm. Therefore, to allow sufficient time for the coolant and circulating fluid to mix evenly, a compensation addition of 0.2L can be initiated 80-85 minutes after the start of cutting, corresponding to a cutting depth of 170mm. This is earlier than the inflection point of the breakage rate increase at a cutting depth of 180mm, thus mitigating the abnormal increase in the breakage rate and saving coolant consumption. Specifically, the coolant consumption can be reduced from 2.5L / cut with a single addition to 2.1L / cut. By adding coolant in stages, the breakage rate can be reduced from 12.38% with a single addition to 8.95%.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid adding method for cutting processing, characterized by, The liquid addition method for the cutting process includes: Add the circulating fluid into the storage tank; Add coolant to the reservoir; Obtain the mixture from the storage tank; During the cutting process, the circulating liquid is added to the storage tank to maintain the preset overflow rate of the mixture; During the cutting process, the coolant is replenished to the mixture in stages, with each replenishment amount being called the replenishment volume. The replenishment volume is determined based on the breakage rate, TTV (Total Transmission Volume), and line marks corresponding to different replenishment volumes. The mixture is replenished in stages according to the replenishment volume. Specifically, this includes the following steps: obtaining a breakage rate trend curve based on the breakage rate corresponding to different replenishment volumes; determining the inflection point of the breakage rate increase based on the breakage rate trend curve; and ensuring that the replenishment of the mixture in stages according to the replenishment volume occurs earlier than the time corresponding to the inflection point of the breakage rate increase in the corresponding time period. To ensure that the wire breakage rate does not exceed the preset value.

2. The liquid adding method for cutting processing according to claim 1, characterized by, Replenishing the storage tank with the circulating liquid to maintain a preset overflow rate for the mixture includes: The total amount of coolant to be added during a single addition is determined based on the total cutting depth of the workpiece to be cut and the volume of the reservoir. Based on the total amount of coolant added during a single addition, the breakage rate corresponding to different overflow rates was measured. The preset overflow rate is determined based on the disconnection rate corresponding to different overflow rates; The circulating fluid is continuously replenished into the storage tank according to the preset overflow rate.

3. The liquid addition method for cutting processing according to claim 2, characterized in that, When the total amount of coolant added is 2L-3L, the preset overflow rate is 250ml / h-350ml / h.

4. The liquid adding method for cutting processing according to claim 2, characterized by Adding coolant to the reservoir includes: The amount of coolant added to the storage tank is the initial addition amount. The initial liquid addition volume is determined based on the breakage rate corresponding to different initial liquid addition volumes; The coolant is added to the storage tank according to the initial addition volume.

5. The liquid adding method for cutting processing according to claim 4, wherein Determining the initial liquid addition volume based on the breakage rate corresponding to different initial liquid addition volumes further includes: The initial liquid addition volume is 68%-72% of the total coolant volume.

6. The liquid adding method for cutting processing according to claim 2, wherein Adding the coolant to the mixture in stages includes: Determine the total cutting time based on the total cutting depth of the workpiece to be cut; Based on the total cutting time, the coolant is added to the mixture in two batches.

7. The liquid adding method for cutting processing according to claim 6, wherein The coolant is added to the mixture in two stages, including: The moment when the coolant is first added to the mixture is defined as the first preset moment, and the ratio of the time interval between the first preset moment and the start of cutting to the total cutting time is 35%-40%. The time when the coolant is added to the mixture for the second time is the second preset time. The ratio of the time interval between the second preset time and the start time of cutting to the total cutting time is in the range of 72%-77%.

8. The liquid adding method for cutting processing according to claim 6, wherein Adding the coolant to the reservoir in stages also includes: If any abnormality occurs during the cutting process, a compensation liquid amount will be added to the mixture at preset abnormality intervals. The proportion of the preset abnormal time to the total cutting time is 35%-40%, the proportion of the compensation liquid adding amount to the total cooling liquid adding amount is 7%-9%, and the abnormal situation of the cutting process includes an abnormal increase in a wire breakage rate, an abnormal increase in TTV, or an abnormal increase in a wire mark.

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