A spray control method and system for a machining center

Abstract

The present invention provides a spray control method and system for a machining center, comprising the following steps: a controller obtains the maximum start / stop requirements of an internal cooling water pump and a spray pump within a set time period; the controller obtains the processing time required for each batch of products to be processed; the controller calculates the extended standby time of the internal cooling water pump and the spray pump after each batch of products is processed, and the advance start time of the internal cooling water pump and the spray pump before each batch of products is processed, based on the maximum number of starts and stops of the internal cooling water pump and the spray pump within the set time period and the processing time required for each batch of products to be processed; the controller controls the internal cooling water pump and the spray pump to switch between a standby state and an active state based on the calculated extended standby time and advance start time. The present invention effectively achieves energy conservation for water pumps in machining centers.

Description

Technical Field

[0001] The present invention belongs to the technical field of machine tool control, and in particular relates to a spray control system and method for a machining center. Background Art

[0002] like Figure 1 As shown in the figure, the same machine processes different products. The energy consumption of the water pump is relatively stable when processing different products. However, due to the unavoidable influence of the line itself, the standby time between processing different products is not constant. Since the water pump is still running during the standby time, the energy consumption of the water pump is also not constant.

[0003] like Figure 2 The figure shows a machining cycle for a workpiece. The machining process requires a water pump to pump cutting fluid. The cutting fluid cools the tool, flushes aluminum chips from the machining process, and lubricates the tool. Depending on the process requirements, machining a single workpiece requires changing different tools, which involves tool changes during the machining process. When the machine is in standby mode, the water pump operates at a low frequency, allowing the cutting fluid to circulate. During machining, the water pump operates at a high frequency, allowing the cutting fluid to perform the three functions described above. During tool changes, the water pump operates at a low frequency, allowing the cutting fluid to circulate.

[0004] In existing technology, energy savings are typically achieved by reducing the inverter's operating frequency. However, there's no definitive standard for the optimal inverter frequency setting. In actual production, there's no established method or standard to determine the optimal frequency setting that both meets production needs and maximizes energy savings, creating significant challenges in the control process. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies in the above-mentioned background technology and to provide a machining center spray control system and method to effectively achieve water pump energy saving.

[0006] The technical solution adopted by the present invention is: a method for controlling spraying in a machining center, comprising: the machining center including spraying pipelines, the spraying pipelines distributed in different areas being provided with nozzles, internal cooling water pumps, and spraying pumps; the signal ends of the internal cooling water pumps and the spraying pumps being electrically connected to a controller, comprising the following steps:

[0007] The controller obtains the maximum start and stop requirements of the internal cooling water pump and the spray pump within the set time period;

[0008] The controller obtains the processing time required for each batch of products to be processed;

[0009] The controller calculates the extended standby time of the internal cooling water pump and the spray pump after each batch of products is processed at the corresponding station based on the maximum number of starts and stops of the internal cooling water pump and the spray pump in the set time period and the processing time required for each batch of products to be processed at the corresponding station of the internal cooling water pump and the spray pump;

[0010] The controller controls the internal cooling water pump and the spray pump to switch between the standby state, the pump stop state and the start state according to the calculated extended standby time.

[0011] In the above technical solution, the machining center also includes a loading mechanism; the controller controls the internal cooling water pump and the spray pump to switch between standby state, pump stop state and start state according to the position information of the loading mechanism.

[0012] In the above technical solution, the extended standby time T1 of the internal cooling water pump is calculated using the following formula:

[0013] T1 = M1 / N1-Q1; N1 represents the maximum number of starts and stops of the internal cooling water pump in the set time period M1; Q1 represents the processing time required for a single batch of products to be processed at the corresponding station of the internal cooling water pump;

[0014] When the controller determines that the processing at the corresponding workstation of the internal cooling water pump is completed, the internal cooling water pump is driven to remain in a standby state; if the controller determines that the internal cooling water pump has been in a standby state for a period of time reaching T1 and the corresponding workstation of the internal cooling water pump has not received any new products to be processed, the internal cooling water pump is driven to stop.

[0015] In the above technical solution, the extended standby time T2 of the spray pump is calculated using the following formula:

[0016] T2 = M2 / N2-Q2; N2 represents the maximum number of starts and stops of the spray pump in the set time period M2; Q2 represents the processing time required for a single batch of products to be processed at the corresponding station of the spray pump;

[0017] When the controller determines that the corresponding workstation of the spray pump has completed processing, it drives the spray pump to remain in standby state; if the controller determines that the spray pump has been in standby state for a period of time reaching T2 and the spray workstation has not received any new products to be processed, it drives the spray pump to stop.

[0018] In the above technical solution, when the controller determines that the feeding mechanism of the internal cooling water pump has reached the feeding preparation position according to the position information of the feeding mechanism of the internal cooling water pump, the controller controls the internal cooling water pump to enter the starting state from the standby state or the pump stop state;

[0019] When the controller determines that the feeding mechanism of the spray pump reaches the feeding preparation position according to the position information of the feeding mechanism of the spray pump, the controller controls the spray pump to enter the starting state from the standby state or the pump stopping state.

[0020] The present invention stops the internal cooling water pump and the spray pump after a period of standby. After the pumps are stopped, there is no energy consumption, thus achieving energy saving. The present invention starts the water pump before the cycle processing begins, which does not affect the use of cutting fluid during processing, saving energy while ensuring the safety of the processing process.

[0021] In the above technical solution, the controller obtains the variable frequency pump performance curve of the frequency converter of the internal cooling water pump. Based on the variable frequency pump performance curve, the controller determines the minimum processing frequency of the frequency converter of the internal cooling water pump when the internal cooling water pump is in the processing state and the pressure of the spray pipeline where the internal cooling water pump is located meets the set pressure standard. When the internal cooling water pump is in the processing state, the controller sets the frequency of the frequency converter of the internal cooling water pump to the minimum processing frequency and adjusts the opening of the pilot relief valve on the spray pipeline so that the pressure of the spray pipeline where the internal cooling water pump is located meets the set pressure standard when the spray pipeline is in the processing state. This invention not only meets process requirements but also effectively achieves energy conservation.

[0022] In the above technical solution, the controller determines, based on machine tool signals from the machining center, the minimum tool-changing frequency of the inverter when the internal cooling water pump is in the tool-changing state and the pressure in the spray pipe where the internal cooling water pump is located meets a set pressure standard. When the internal cooling water pump is in the tool-changing state, the controller sets the frequency of the internal cooling water pump's inverter to this minimum tool-changing frequency. This invention fully considers the life of the water pump's mechanical seal, effectively achieving energy savings while meeting process requirements.

[0023] In the above technical solution, the controller obtains the pressure requirements of the processing technology and the pressure requirements of the eddy current separator's decontamination working condition, and maximizes the outlet pressure of the internal cooling water pump and the spray pump while meeting the pressure requirements of both, thereby effectively achieving energy saving.

[0024] In the above technical solution, the controller monitors the product status in real time. When the controller determines that the end spray pump or top spray pump has completed processing of the product, it immediately shuts down the end spray pump and top spray pump corresponding to the processed product. Since the end spray pump and top spray pump remain in the open state after processing the product, leaving them open at this time does not contribute to production and instead wastes energy. By shutting down the end spray pump or top spray pump according to the processing status, energy conservation is achieved.

[0025] The present invention provides a spray control system for a machining center, comprising a spray pipeline for the machining center, wherein nozzles, an internal cooling water pump, and a spray pump are provided on the spray pipeline distributed in different areas; signal ends of the internal cooling water pump and the spray pump are electrically connected to a controller; the controller is used to obtain the maximum start and stop requirements of the internal cooling water pump and the spray pump within a set time period; the controller obtains the processing time required for each batch of products to be processed;

[0026] The controller calculates the extended standby time of the internal cooling water pump and the spray pump after each batch of products is processed, based on the maximum number of starts and stops of the internal cooling water pump and the spray pump in the set time period and the processing time required for each batch of products to be processed;

[0027] The controller controls the internal cooling water pump and the spray pump to switch between the standby state, the pump stop state and the start state according to the calculated extended standby time.

[0028] The present invention has the following beneficial effects: By analyzing and calculating the water pump performance curve, it can achieve energy savings by reducing the water pump operating frequency while maintaining constant pressure, without affecting the equipment's operating rate or quality. It also achieves energy savings by rationally optimizing the water pump's early startup and extending its standby time. It also achieves energy savings by increasing the water pump outlet pressure based on processing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a bar chart of the energy consumption of the water pump during the continuous machining cycle of the machining center.

[0030] The horizontal axis is the processing time, and the vertical axis is the energy consumption when the water pump is running. The figure shows three complete processing cycles and the standby time between processing each product.

[0031] Figure 2 This is a bar chart of the water pump energy consumption during one machining cycle of a machining center.

[0032] Figure 3 This is the performance curve of the variable frequency pump for the internal cooling water pump of the machining center.

[0033] The chart shows the relationship between flow rate, head (pressure), and energy consumption at different frequencies. Flow rate is on the horizontal axis, head (pressure) is on the vertical axis in the upper half of the chart, and energy consumption is on the vertical axis in the lower half. The pump is comfortable operating in the darker areas, while operating in the lighter areas can be prone to pump and motor failure.

[0034] Figure 4 A schematic diagram of the energy consumption of the internal cooling water pump of a machining center for one detection cycle; the horizontal axis is time and the vertical axis is the power consumed by the water pump.

[0035] The upper graph shows the power consumption before optimization, the middle graph shows the theoretical energy saving calculation, and the lower graph shows the actual power consumption after optimization. It can be seen that the actual energy saving is basically consistent with the theoretical energy saving calculation.

[0036] Figure 5 This is a comparison chart of energy consumption after adopting the control method of the present invention, wherein the horizontal axis is time and the vertical axis is the power consumption of the water pump.

[0037] Figure 6 This is a comparison chart of energy consumption before and after adopting the control method of the present invention.

[0038] Figure 7 This is a diagram showing the energy consumption difference after adopting the control method of the present invention.

[0039] Figure 8 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation to the present invention.

[0041] The technical solution adopted by the present invention is: a method for controlling spraying in a machining center, comprising: the machining center including spraying pipelines, the spraying pipelines distributed in different areas being provided with nozzles, internal cooling water pumps, and spraying pumps; the signal ends of the internal cooling water pumps and the spraying pumps being electrically connected to a controller, comprising the following steps:

[0042] The controller obtains the maximum start and stop requirements of the internal cooling water pump and the spray pump within the set time period;

[0043] The controller obtains the processing time required for each batch of products to be processed;

[0044] The controller calculates the extended standby time of the internal cooling water pump and the spray pump after each batch of products is processed at the corresponding station based on the maximum number of starts and stops of the internal cooling water pump and the spray pump in the set time period and the processing time required for each batch of products to be processed at the corresponding station of the internal cooling water pump and the spray pump;

[0045] The controller controls the internal cooling water pump and the spray pump to switch between the standby state, the pump stop state and the start state according to the calculated extended standby time.

[0046] Specifically, the machining center further includes a feeding mechanism; the controller controls the internal cooling water pump and the spray pump to switch between a standby state, a pump stop state and a start state according to position information of the feeding mechanism.

[0047] Specifically, the extended standby time T1 of the internal cooling water pump is calculated using the following formula:

[0048] T1 = M1 / N1-Q1; N1 represents the maximum number of starts and stops of the internal cooling water pump in the set time period M1; Q1 represents the processing time required for a single batch of products to be processed at the corresponding station of the internal cooling water pump;

[0049] When the controller determines that the internal cooling water pump has completed processing at the corresponding workstation, it drives the internal cooling water pump to remain in standby mode. If the controller determines that the internal cooling water pump has been in standby mode for a period of time exceeding T1 and the corresponding workstation has not received any new products to be processed, the internal cooling water pump is driven to stop. If the controller determines that the internal cooling water pump is in standby mode and the corresponding workstation receives a new product to be processed, the internal cooling water pump is driven to start.

[0050] Specifically, the extended standby time T2 of the spray pump is calculated using the following formula:

[0051] T2 = M2 / N2-Q2; N2 represents the maximum number of starts and stops of the spray pump in the set time period M2; Q2 represents the processing time required for a single batch of products to be processed at the corresponding station of the spray pump;

[0052] When the controller determines that the spray pump's corresponding station has completed processing, it drives the spray pump to remain in standby mode. If the controller determines that the spray pump has remained in standby mode for a period of time exceeding T2 and the spray station has not received any new products to be processed, the spray pump is driven to stop. If the controller determines that the spray pump remains in standby mode and the corresponding station receives a new product to be processed, the spray pump is driven to start.

[0053] Specifically, when the controller determines that the feeding mechanism of the internal cooling water pump reaches the feeding preparation position according to the position information of the feeding mechanism of the internal cooling water pump, the controller controls the internal cooling water pump to enter the starting state from the standby state or the pump stopping state;

[0054] When the controller determines that the feeding mechanism of the spray pump reaches the feeding preparation position according to the position information of the feeding mechanism of the spray pump, the controller controls the spray pump to enter the starting state from the standby state or the pump stopping state.

[0055] The present invention stops the internal cooling water pump and the spray pump after a period of standby. After the pumps are stopped, there is no energy consumption, thus achieving energy saving. The present invention starts the water pump before the cycle processing begins, which does not affect the use of cutting fluid during processing, saving energy while ensuring the safety of the processing process.

[0056] Specifically, the controller obtains a variable frequency pump performance curve for the frequency converter of the internal cooling water pump. Based on the variable frequency pump performance curve, the controller determines the minimum processing frequency of the frequency converter of the internal cooling water pump when the internal cooling water pump is in a processing state and the pressure of the spray pipeline where the internal cooling water pump is located meets a set pressure standard. When the internal cooling water pump is in the processing state, the controller sets the frequency converter frequency of the internal cooling water pump to the minimum processing frequency and adjusts the opening of the pilot relief valve on the spray pipeline so that the pressure of the spray pipeline where the internal cooling water pump is located meets the set pressure standard when the spray pipeline is in the processing state. This invention not only meets process requirements but also effectively achieves energy conservation.

[0057] Specifically, the theoretical basis is as follows: power is proportional to the cube of the rotational speed. At the same time, the rotational speed is equal to 60 times the frequency divided by the number of magnetic poles. It can be concluded that power is proportional to the cube of the frequency. Then, when the frequency decreases, the power also decreases, thus achieving the purpose of energy saving.

[0058] Specifically, the controller, based on machine tool signals from the machining center, determines the minimum tool-changing frequency of the inverter when the internal cooling water pump is in the tool-changing state and the pressure in the spray pipe where the internal cooling water pump is located meets a set pressure standard. When the internal cooling water pump is in the tool-changing state, the controller sets the frequency of the inverter of the internal cooling water pump to the minimum tool-changing frequency. This invention fully considers the life of the water pump's mechanical seal, effectively achieving energy savings while meeting process requirements.

[0059] Specifically, the controller determines the inverter's minimum standby frequency when the spray line, where the internal cooling water pump is located, is in standby mode based on the variable frequency pump performance curve and the spray line pressure meets the set pressure standard. The controller also adjusts the inverter's frequency proportionally to the minimum standby frequency based on the internal cooling water pump's failure rate. This invention fully considers the lifespan of the pump's mechanical seal, effectively achieving energy savings while meeting process requirements.

[0060] Specifically, the controller obtains the pressure requirements of the processing technology and the pressure requirements of the eddy current separator's decontamination working condition, and maximizes the outlet pressure of the internal cooling water pump and the spray pump while meeting the pressure requirements of both, effectively achieving energy saving.

[0061] Specifically, the controller monitors the status of the product in real time. When it determines that the end spray pump or top spray pump has completed processing on the product it's serving, it immediately shuts down the corresponding end spray pump and top spray pump. Since the end spray pump and top spray pump remain on after processing, their operation doesn't contribute to production and instead wastes energy. By shutting down the end spray pump or top spray pump based on the processing status, energy savings are achieved.

[0062] The present invention stops the internal cooling water pump and the spray pump after a period of standby. After the pumps are stopped, there is no energy consumption, thus achieving energy saving. The present invention starts the water pump before the cycle processing begins, which does not affect the use of cutting fluid during processing, saving energy while ensuring the safety of the processing process.

[0063] The present invention provides a spray control system for a machining center, comprising a spray pipeline for the machining center, wherein nozzles, an internal cooling water pump and a spray pump are arranged on the spray pipeline distributed in different areas; the signal ends of the internal cooling water pump and the spray pump are electrically connected to a controller; the controller is used to obtain the maximum start and stop requirements of the internal cooling water pump and the spray pump within a set time period; the controller obtains the processing time required for each batch of products to be processed; the controller calculates the extended standby time of the internal cooling water pump and the spray pump after the processing of each batch of products is completed based on the maximum start and stop times of the internal cooling water pump and the spray pump within the set time period and the processing time required for each batch of products to be processed; the controller controls the internal cooling water pump and the spray pump to switch between a standby state, a pump-off state and a start state according to the calculated extended standby time.

[0064] like Figure 3 As shown, the water pump outlet pressure increases (the upper half of the table) and the energy consumption decreases (corresponding to the lower half of the table). The water pump outlet pressure can be adjusted by the ball valve and the pilot-operated relief valve. When the water pump outlet pressure remains unchanged, the water pump frequency decreases (the upper half of the table) and the energy consumption decreases (corresponding to the lower half of the table). The desired effect can be achieved by using a frequency converter in combination with a pilot-operated relief valve. Obviously, if the water pump is powered off and not running, it can naturally reduce energy consumption.

[0065] Under the premise of not affecting the start-up and quality, combined with actual production, the specific embodiment of the present invention adopts the following control steps:

[0066] (1) Achieve energy saving by optimizing frequency conversion parameters, such as Figure 4 shown.

[0067] The internal cooling water pump is controlled by a frequency converter. The control first obtains the frequency conversion parameters of the frequency converter under different states of the internal cooling water pump: machining: 50Hz (100%), tool change: 37.5Hz (75%), standby: 37.5Hz (75%).

[0068] According to the production process requirements, the pressure standard during processing is 2.8MPa. Combined with the "Variable Frequency Pump Performance Curve" diagram, it is known that the inverter frequency is set at 45Hz (90%) during processing, and then by adjusting the opening of the pilot relief valve, the pressure of the spray pipeline can meet the 2.8MPa production process requirements. According to experimental data, considering the life of the water pump mechanical seal, the inverter frequency of the internal cooling water pump is preferably set to 30Hz (60%) during tool change and standby.

[0069] like Figure 4 As shown, the optimization method of this specific embodiment can effectively solve the problem of electric energy.

[0070] (2) After the processing is completed, the water pump is powered off for a delayed period to achieve energy saving, such as Figure 5shown.

[0071] Each OP10-OP40 process has 10 machines. Due to production matching issues between processes and downtime in subsequent processes, the NC equipment inevitably experiences standby periods during machining. Actual calculations show that, assuming an 86% utilization rate, the NC equipment can experience standby periods of 7-9 hours within a 24-hour period. During this standby period, the internal cooling water pump and spray pump continue to operate, resulting in energy waste. This specific embodiment modifies the controller's PMC control program so that the internal cooling water pump stops after 120 seconds of processing, and the spray pump stops after 90 seconds of processing. Based on the position and operation timing of the loading mechanism, the spray pump and internal cooling water pump are turned on 8 seconds before the next machining cycle begins, without affecting the use of cutting fluid during machining. With the pumps turned off, there is no energy consumption, thus achieving energy savings. The start and stop times for the two pumps meet the hourly allowable start and stop times for this brand of pumps, without affecting pump performance or lifespan. The operating conditions of the internal cooling water pump and spray pump in this specific embodiment are shown in the following table:

[0072]

[0073] (3) Energy saving can be achieved by controlling the water pump to shut off immediately after processing, such as Figure 6 shown.

[0074] On-site observations revealed that the end spray pumps and top spray pumps remained running even after processing finished products. This behavior, while not contributing to production, actually resulted in energy waste. Based on this, the controller in this specific embodiment implemented an M-code instruction to immediately shut down these two pumps after processing finished products. Six months of quality assurance and operational verification confirmed no negative impacts.

[0075] (4) Energy saving can be achieved by optimizing the valve opening, such as Figure 7 shown.

[0076] The controller can also save energy by increasing the pump outlet pressure via a ball valve or pilot-operated relief valve. Considering the pressure requirements of the on-site process and the eddy current separator's decontamination operation, the controller will maximize the outlet pressure of the internal cooling water pump and spray pump, ensuring both operating conditions are met.

[0077] In this specific embodiment, the controller obtains the pressure requirement of the processing technology and the pressure requirement of the eddy current separator decontamination working condition, and maximizes the outlet pressure of the internal cooling water pump and the spray pump while satisfying the pressure requirements of both. Figure 7The figure shows the pump power consumption of 10 machines (numbered 20-1 through 20-11, excluding 20-8) in the same process before adopting the valve optimization control solution, and the pump power consumption of machine number 11 after adopting the valve optimization control solution. The data was measured every second for 150 seconds (the figure shows data from seconds 1-5 and 147-150), and the average of the 150 data points was used. Figure 7 The difference in the figure represents the difference in power consumption between each set of data and the pump after the valve optimization control scheme is adopted. Figure 7 As shown in the figure, the power consumption of 10 devices before optimization is compared with the standard power consumption after optimization to obtain the optimization amount. From the optimization amount, it can be seen that 8 devices have saved power.

[0078] The energy-saving effect of this specific embodiment is shown in the following table:

[0079]

[0080] 1. Economic benefits: 619654*0.62=384185.48 yuan

[0081] 2. Environmental benefits: 619654*0.5257 / 10000=32.58 tons

[0082] 3. Social benefits: 32.58*1000 / 18=1810 trees

[0083] According to research data from the State Forestry Administration, a single tree can absorb and store 4-18kg of carbon dioxide annually, saving 384,185.48 yuan in electricity costs and reducing carbon dioxide emissions by 32.58 tons annually, equivalent to planting at least 1,810 trees.

[0084] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A method for controlling spraying in a machining center, comprising: the machining center including spraying pipelines, the spraying pipelines being provided with nozzles, internal cooling water pumps, and spraying pumps in different areas; the signal terminals of the internal cooling water pumps and the spraying pumps being electrically connected to a controller, characterized in that: The following steps are involved: The controller obtains the maximum start and stop requirements of the internal cooling water pump and the spray pump within the set time period; The controller obtains the processing time required for each batch of products to be processed; The controller calculates the extended standby time of the internal cooling water pump and the spray pump after each batch of products is processed at the corresponding station based on the maximum number of starts and stops of the internal cooling water pump and the spray pump in the set time period and the processing time required for each batch of products to be processed at the corresponding station of the internal cooling water pump and the spray pump; The controller controls the internal cooling water pump and the spray pump to switch between the standby state, the pump stop state and the start state according to the calculated extended standby time; The processing center also includes a loading mechanism; When the controller determines that the feeding mechanism of the internal cooling water pump has reached the feeding preparation position according to the position information of the feeding mechanism of the internal cooling water pump, the controller controls the internal cooling water pump to enter the starting state from the standby state or the pump stopping state; When the controller determines that the feeding mechanism of the spray pump reaches the feeding preparation position according to the position information of the feeding mechanism of the spray pump, the controller controls the spray pump to enter the starting state from the standby state or the pump stopping state.

2. A spray control method for a machining center according to claim 1, characterized in that: The extended standby time T1 of the internal cooling water pump is calculated using the following formula: T1 = M1 / N1-Q1; N1 represents the maximum number of starts and stops of the internal cooling water pump in the set time period M1; Q1 represents the processing time required for a single batch of products to be processed at the corresponding station of the internal cooling water pump; When the controller determines that the processing at the corresponding workstation of the internal cooling water pump is completed, the internal cooling water pump is driven to remain in a standby state; if the controller determines that the internal cooling water pump has been in a standby state for a period of time reaching T1 and the corresponding workstation of the internal cooling water pump has not received any new products to be processed, the internal cooling water pump is driven to stop.

3. A spray control method for a machining center according to claim 1, characterized in that: The extended standby time T2 of the spray pump is calculated using the following formula: T2 = M2 / N2-Q2; N2 represents the maximum number of starts and stops of the spray pump in the set time period M2; Q2 represents the processing time required for a single batch of products to be processed at the corresponding station of the spray pump; When the controller determines that the corresponding workstation of the spray pump has completed processing, it drives the spray pump to remain in standby mode; if the controller determines that the spray pump has been in standby mode for a period of time reaching T2 and the spray workstation has not received any new products to be processed, it drives the spray pump to stop.

4. A spray control method for a machining center according to claim 1, characterized in that: The controller obtains a frequency conversion pump performance curve of the frequency converter of the internal cooling water pump; the controller determines, based on the frequency conversion pump performance curve of the frequency converter of the internal cooling water pump, a minimum processing frequency corresponding to the frequency converter of the internal cooling water pump when the internal cooling water pump is in a processing state and the pressure of the spray pipeline where the internal cooling water pump is located meets a set pressure standard; when the internal cooling water pump is in the processing state, the controller sets the frequency of the frequency converter of the internal cooling water pump to the said minimum processing frequency, and adjusts the opening of the pilot overflow valve on the spray pipeline so that when the spray pipeline where the internal cooling water pump is located is in the processing state, the pressure of the spray pipeline meets the set pressure standard.

5. The method for controlling spraying in a machining center according to claim 1, wherein: The controller determines, based on the machine tool signal of the machining center, that when the internal cooling water pump is in the tool-changing state and the pressure of the spray pipeline where the internal cooling water pump is located meets the set pressure standard, the minimum tool-changing frequency corresponding to the inverter; when the internal cooling water pump is in the tool-changing state, the controller sets the frequency of the inverter of the internal cooling water pump to the said minimum tool-changing frequency.

6. A spray control method for a machining center according to claim 1, characterized in that: The controller obtains the pressure requirements of the processing technology and the pressure requirements of the eddy current separator decontamination working condition, and maximizes the outlet pressure of the internal cooling water pump and the spray pump while meeting the pressure requirements of both.

7. The method for controlling spraying in a machining center according to claim 1, wherein: The controller detects the status of the product in real time. When the controller determines that the product on which the end spray pump or the top spray pump acts is processed is completed, the controller immediately turns off the end spray pump and the top spray pump corresponding to the processed product.

8. A spray control system for a machining center, comprising spray pipelines, each of which is distributed in different areas and is provided with nozzles, internal cooling water pumps, and spray pumps; signal terminals of the internal cooling water pumps and spray pumps are electrically connected to a controller; and characterized in that: The controller is used to obtain the maximum start and stop requirements of the internal cooling water pump and the spray pump within a set time period; the controller obtains the processing time required for each batch of products to be processed; The controller calculates the extended standby time of the internal cooling water pump and the spray pump after each batch of products is processed, based on the maximum number of starts and stops of the internal cooling water pump and the spray pump in the set time period and the processing time required for each batch of products to be processed; The controller controls the internal cooling water pump and the spray pump to switch between the standby state, the pump stop state and the start state according to the calculated extended standby time; The processing center also includes a loading mechanism; When the controller determines that the feeding mechanism of the internal cooling water pump has reached the feeding preparation position according to the position information of the feeding mechanism of the internal cooling water pump, the controller controls the internal cooling water pump to enter the starting state from the standby state or the pump stopping state; When the controller determines that the feeding mechanism of the spray pump reaches the feeding preparation position according to the position information of the feeding mechanism of the spray pump, the controller controls the spray pump to enter the starting state from the standby state or the pump stopping state.

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