Cooling liquid circulation system for five-axis machining

Abstract

The invention discloses a cooling liquid circulation system for five-axis machining, which comprises a machining area, a cooling liquid backflow path, a multi-stage filtering unit and a purified liquid storage tank, and is characterized in that the multi-stage filtering unit comprises a primary filtering module, a secondary precision filtering module and a tertiary deep treatment module which are sequentially connected along the flowing direction of cooling liquid; the multi-stage cooling liquid filtering process comprises the following steps: S1, collecting and pre-separating; s2, multi-stage filtration: pumping the pretreated cooling liquid into a multi-stage filtration unit for stage-by-stage purification; s3, oil-water separation: guiding the cooling liquid subjected to three-stage deep treatment into an oil-water separation unit; and S4, storing and adjusting. A multi-stage filtering unit formed by connecting a primary filtering module, a secondary precision filtering module and a tertiary deep treatment module in series is arranged at the downstream of a cooling backflow path, and a three-stage gradient filtering system of rough filtration, fine filtration and adsorption is adopted, so that layering, targeted interception and deep removal of impurities in cooling liquid are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling liquid circulation, in particular to a cooling liquid circulation system for five-axis machining. BACKGROUND

[0002] In the field of machining, industrial manufacturing, etc., the recycling of cooling liquid is crucial for the normal operation of the equipment. The performance of the cooling liquid circulation system of the five-axis machining center, as the core equipment of high-end manufacturing, directly affects the machining precision, tool life and production cost. The cooling liquid circulation system for five-axis machining is a precise, dynamic and multifunctional system, which is not only a simple spraying, but also a complex subsystem integrating storage, pressurized delivery, spraying, efficient recovery, multi-stage filtration, temperature control and intelligent management.

[0003] However, during use, the cooling liquid may mix with impurities, oil stains, metal particles and other pollutants, affecting its cooling effect and equipment life. The traditional cooling liquid circulation system often lacks effective purification measures, resulting in a decrease in the quality of the cooling liquid. Frequent replacement of the cooling liquid not only increases the cost, but also may cause environmental pollution. Therefore, the deficiency of the cooling liquid circulation system in purification has invented a cooling liquid circulation system for five-axis machining. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies of the prior art and provide a cooling liquid circulation system for five-axis machining.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A cooling liquid circulation system for five-axis machining, characterized in that it comprises a machining area, a cooling liquid return path, a multi-stage filtration unit and a purified liquid storage tank. The multi-stage filtration unit is arranged downstream of the cooling return path and is connected to the purified liquid storage tank. The multi-stage filtration unit comprises a primary filtration module, a secondary precision filtration module and a tertiary deep treatment module connected in sequence along the flow direction of the cooling liquid.

[0007] The cooling liquid multi-stage filtration process for five-axis machining comprises the following steps:

[0008] S1. Collection and pre-separation: collect the cooling liquid containing impurities in the machining area and pre-separate it through a gravity settling tank;

[0009] S2. Multi-stage filtration: pump the pretreated cooling liquid into the multi-stage filtration unit for step-by-step purification;

[0010] a. Mechanical sieve filtration through the primary filtration module;

[0011] b. Gradient precision filtration through the secondary precision filtration module;

[0012] c. centrifugal separation and magnetic adsorption are synchronously carried out by the tertiary deep treatment module;

[0013] S3. Oil-water separation: the cooling liquid subjected to the tertiary deep treatment is introduced into an oil-water separation unit, and oil-water separation is carried out by using oleophilic coalescence filter material and inclined plate settling tank under the conditions that the temperature is 30-50 DEG C and the flow rate is 0.5-2.0 m / s;

[0014] S4. Storage and adjustment: the cooling liquid subjected to the oil-water separation is transported to a purified liquid storage tank, and pH value calibration is carried out by using a pH adjustment electrode.

[0015] The downstream of the purified liquid storage tank is sequentially connected with a liquid supply system, a control system and a real-time turbidity monitor, and the liquid supply system pressurizes and transports the cooling liquid in the purified liquid storage tank to a processing area.

[0016] The secondary precision filtration module comprises a bag filter and a filter core filter which are arranged in parallel.

[0017] The tertiary deep treatment module comprises a centrifugal separator, a magnetic adsorber and an oil-water separation unit in sequence, and the oil-water separation unit comprises oleophilic coalescence filter material and an inclined plate settling tank.

[0018] The purified liquid storage tank is provided with an ultrasonic sterilizer and a pH adjustment electrode, and the pH adjustment electrode is electrically connected with the control system.

[0019] In step S2, the gradient precision filtration comprises:

[0020] When the system flow rate is greater than 50 L / min, the bag filter path is automatically switched to;

[0021] When the system flow rate is less than or equal to 50 L / min, the filter core filter path is automatically switched to and a backwashing program is triggered.

[0022] In step S3, the oil-water separation is carried out under the working condition that the temperature is 40-45 DEG C and the flow rate is limited in the range of 0.8-1.2 m / s.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. By setting a multi-stage filtration unit composed of a primary filtration module, a secondary precision filtration module, and a tertiary deep treatment module in series downstream of the cooling circulation path, and adopting a "coarse filtration-precision filtration-adsorption" three-stage gradient filtration system, the layered, targeted interception and deep removal of impurities in the cooling liquid are realized, and the filtration precision, impurity removal rate, and oil-water separation efficiency of the cooling liquid circulation system are significantly improved, so that the cooling liquid gradually removes impurities of different particle sizes in the step-by-step filtration process, ensuring that the purity of the cooling liquid is improved in steps, thereby prolonging the service life of the cooling liquid, effectively reducing equipment wear and maintenance costs, and ultimately achieving effective reduction of the comprehensive operating cost of the cooling liquid circulation system.

[0025] 2. By adopting a mechanical screen filtration method in the primary filtration module, large-particle impurities are intercepted by the screen to prevent them from entering the subsequent modules; the secondary precision filtration module uses a bag filter and a filter cartridge filter arranged in parallel, and can flexibly switch the filtration path according to the cooling liquid flow and impurity conditions, thereby ensuring filtration effect and improving system operation stability, avoiding blockage or efficiency reduction caused by a single filtration method; the tertiary deep treatment module is the last purification stage, which uses a centrifugal separator to separate solid particles and liquid impurities by centrifugal force, a magnetic adsorber to adsorb impurities such as iron filings, and an oil-water separation unit to further separate oil and water, thereby achieving deep purification of the cooling liquid. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 is a structural schematic diagram of the cooling liquid circulation system of the present application;

[0027] Figure 2 Fig. 2 is a process flow diagram of the multi-stage filtration of the cooling liquid of the present application.

[0028] In the figure: processing area 1, cooling liquid circulation path 2, multi-stage filtration unit 3, primary filtration module 31, secondary precision filtration module 32, bag filter 321, filter cartridge filter 322, tertiary deep treatment module 33, centrifugal separator 331, magnetic adsorber 332, oil-water separation unit 333, oleophilic coalescing filter material 3331, inclined plate settling tank 3332, purified liquid storage tank 4, ultrasonic sterilizer 41, pH value adjusting electrode 42, liquid supply system 5, control system 6, real-time turbidity monitor 7. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to illustrate the present application and not to limit the scope of the present application.

[0030] A cooling liquid circulation system for five-axis machining, comprising:

[0031] Processing area 1: the place where the cooling liquid directly contacts the machining object (workpiece and tool).

[0032] In the five-axis machining process, a large amount of heat is generated between the workpiece and the tool, and impurities such as chips are generated during cutting.

[0033] Cooling liquid return path 2: a channel connecting the machining area 1 and the multi-stage filtration unit 3, responsible for recycling the cooling liquid in the machining area 1 to the multi-stage filtration unit 3;

[0034] Multi-stage filtration unit 3: sequentially purifying the cooling liquid according to different filtration accuracy, including primary filtration module 31, secondary precision filtration module 32 and tertiary deep treatment module 33.

[0035] 1. The primary filtration module 31 is used to preliminarily purify the recycled cooling liquid, mainly using mechanical screen filtration, using screen or filter plate to intercept large particle impurities, removing large particle impurities and debris;

[0036] 2. The secondary precision filtration module 32 further purifies the cooling liquid, removing medium particle impurities;

[0037] 3. The tertiary deep treatment module 33 is the last stage of cooling liquid purification, removing small particles and suspended solids.

[0038] Purified liquid storage tank 4: plays a buffering and storage role;

[0039] Liquid supply system 5: delivers the cooling liquid in the purified liquid storage tank 4 to the machining area 1 according to the demand of the machining area 1 at a suitable pressure and flow rate;

[0040] Control system 6: monitors and adjusts the operation of the entire system;

[0041] Real-time turbidity monitor 7: monitors the turbidity of the cooling liquid.

[0042] The multi-stage filtration unit 3 is arranged downstream of the cooling return path 2 and connected with the purified liquid storage tank 4, the multi-stage filtration unit 3 includes the primary filtration module 31, the secondary precision filtration module 32 and the tertiary deep treatment module 33 connected in sequence along the cooling liquid flow direction, the cooling liquid is filtered through the three-stage system of "coarse filtration-precision filtration-adsorption" to realize layer-by-layer interception of impurities, the primary filtration module 31 preliminarily purifies the recycled cooling liquid by mechanical screen filtration, using screen or filter plate to intercept large particle impurities, avoiding large particle impurities directly entering the subsequent filtration module, blocking the filter element or affecting the filtration effect.

[0043] Further, the secondary precision filtration module 32 further purifies the coolant to remove medium-sized impurities, which includes a bag filter 321 and a filter cartridge filter 322 arranged in parallel. This parallel design can flexibly switch the filtration path according to the flow and impurity of the coolant. When the system flow is large (> 50 L / min), it is automatically switched to the bag filter 321 path, because the bag filter 321 has strong flow capacity and can meet the demand of high flow; when the system flow is small (≤ 50 L / min), it is automatically switched to the filter cartridge filter 322 path and triggers the backwashing program. The filter cartridge filter 322 has higher filtering precision and can effectively remove smaller impurities. This gradient precision filtration method can not only ensure the filtering effect, but also improve the system stability and avoid filter clogging or reduced filtering efficiency caused by a single filtration method.

[0044] In addition, the tertiary deep processing module 33 is the last stage of coolant purification, which includes a centrifugal separator 331, a magnetic adsorber 332 and an oil-water separation unit 333. The centrifugal separator 331 separates solid particles and liquid impurities in the coolant by centrifugal force, and the magnetic adsorber 332 can adsorb iron filings and other impurities in the coolant, further improving the purity of the coolant through magnetic adsorption.

[0045] The oil-water separation unit 333 is arranged downstream of the tertiary deep processing module 33 and upstream of the purified liquid storage tank 4. The oil-water separation unit 333 includes oleophilic coalescing filter material 3331 and inclined plate settling tank 3332. The oleophilic coalescing filter material 3331 can gather oil droplets in the coolant together to form larger oil droplets, facilitating separation, and the inclined plate settling tank 3332 uses the principle of gravity settling to separate oil droplets and water.

[0046] The control system 6 is electrically connected with a real-time turbidity monitor 7. The control system 6 can automatically adjust the operating state of the multi-stage filtration unit 3 according to the coolant turbidity data fed back by the real-time turbidity monitor 7. The liquid supply system 5 pressurizes and delivers the coolant in the purified liquid storage tank 4 to the processing area 1 and is electrically connected with the real-time turbidity monitor 7, which can automatically adjust the liquid supply parameters according to the turbidity of the coolant to ensure that the quality of the coolant during the processing process is always in the best state.

[0047] The purified liquid storage tank 4 is provided with an ultrasonic sterilizer 41 and a pH value adjusting electrode 42. The pH value adjusting electrode 42 is electrically connected with the control system 6. The ultrasonic sterilizer 41 can kill bacteria and microorganisms in the coolant by cavitation effect caused by high-frequency vibration of ultrasonic waves, preventing the coolant from deteriorating and generating odor. The pH value adjusting electrode 42 can monitor the pH value of the coolant in real time and calibrate the pH value through the control system 6 to ensure that the pH value of the coolant is within a suitable range.

[0048] The embodiment discloses a cooling liquid multi-stage filtering process for five-axis machining, comprising the following steps:

[0049] S1. Collecting and pre-separating: collecting the impurity-containing cooling liquid in the machining area 1, pre-separating the cooling liquid in the gravity settling tank to make the large-particle impurities and chips in the cooling liquid naturally settle at the bottom, and preliminarily removing part of the impurities, which can reduce the burden of the subsequent filtering module and improve the efficiency of the entire filtering system;

[0050] S2. Multi-stage filtering: pumping the pretreated cooling liquid into the multi-stage filtering unit 3 for step-by-step purification;

[0051] a. Mechanical screening is performed through the primary filtering module 31 to remove the large-particle impurities in the cooling liquid, avoiding blockage or reducing the filtering effect;

[0052] b. Gradient precision filtering is performed through the secondary precision filtering module 32, and the bag-type filter 321 or the filter core-type filter 322 is automatically selected for filtering according to the system flow and the pressure difference between the inlet and outlet of the filter;

[0053] When the system flow is greater than 50 L / min, the bag-type filter 321 channel is automatically switched to. The bag-type filter 321 has strong flow capacity and can meet the filtering demand of high flow, and the filtering precision thereof is generally between 10-50 μm, which can remove the medium-particle impurities.

[0054] When the system flow is less than or equal to 50 L / min, the filter core-type filter 322 channel is automatically switched to and the backwashing program is triggered. The filter core-type filter 322 has higher filtering precision, generally between 1-10 μm, which can remove finer impurity particles. This gradient precision filtering mode can flexibly adjust the filtering path according to the actual condition of the cooling liquid, which can ensure the filtering effect and avoid the blockage or the decrease of the filtering efficiency of the filter caused by a single filtering mode, thereby improving the operation stability and reliability of the system.

[0055] c. Centrifugal separation and magnetic adsorption are simultaneously performed through the tertiary deep treatment module 33, so that the cooling liquid is deeply purified in this stage;

[0056] S3. Oil-water separation: the cooling liquid subjected to the tertiary deep treatment is introduced into the oil-water separation unit 333, and the oil-water separation is performed by using the oleophilic coalescence filter material 3331 and the inclined plate settling tank 3332 under the condition that the temperature is 30-50 ℃ and the flow rate is 0.5-2.0 m / s;

[0057] The lipophilic coalescing filter 3331 can coalesce the oil droplets in the cooling liquid together to form larger oil droplets for easy separation, and the inclined plate settling tank 3332 separates the oil droplets and water by gravity settling principle. The oil-water separation is carried out at 40-45℃ and the flow rate is limited to 0.8-1.2 m / s, which ensures the best oil-water separation effect.

[0058] S4. Storage and adjustment: the cooling liquid after oil-water separation is transported to the purified liquid storage tank 4, ultrasonic sterilization is performed on the cooling liquid in the purified liquid storage tank 4, and pH value calibration is performed by the pH adjustment electrode 42.

[0059] Comparative example:

[0060] The comparative example discloses a traditional cooling liquid filtering process for five-axis machining, which comprises the following steps:

[0061] S1. Collection and pre-separation: collect the impurity-containing cooling liquid in the machining area and introduce it into a single filter tank for pre-separation;

[0062] S2. Single-stage filtration: pump the pretreated cooling liquid into a single-stage filtration unit and filter it by using a common filter screen;

[0063] S3. Storage and adjustment: transport the single-stage filtered cooling liquid to the purified liquid storage tank and calibrate the pH value by using the pH adjustment electrode.

[0064] The filtering precision, impurity removal rate, oil-water separation efficiency, filter replacement frequency, equipment wear rate, cooling liquid service life and comprehensive operation cost of the embodiment and the comparative example are determined, and the determination results are as follows:

[0065] Table 1 Comparison results of various technical indexes

[0066] Example Comparative Example Filtering precision ≤ 5 μm ≥ 50 μm Impurity removal rate ＞99% 70%～75% Oil-water separation efficiency ≥95% 75%～85% Filter material replacement frequency 1 time / quarter 1 time / week Equipment wear rate Reduced by more than 60% Benchmark (100%) Cooling liquid service life Extended to 6-8 months 3-4 months Overall operating cost Reduced by about 35% Benchmark (100%)

[0067] The filtering precision is a measure of the ability of the cooling liquid filtration system to effectively intercept the smallest particles, which is a key factor determining the impurity removal rate and the oil-water separation efficiency. The filtering precision, impurity removal rate and oil-water separation efficiency of the embodiment are much higher than those of the comparative example, which fully shows that the multi-stage filtration technology can more effectively remove the tiny particles in the cooling liquid and significantly improve the impurity removal rate and the oil-water separation efficiency, thereby improving the filtration quality of the cooling liquid circulation system.

[0068] Filtration accuracy, impurity removal rate, and oil-water separation efficiency directly affect filter media replacement efficiency, equipment wear rate, and coolant lifespan. In this embodiment, the filter media replacement frequency is once per quarter, significantly lower than the comparative example. Regarding equipment wear rate, compared to the comparative example (100%), this embodiment reduces equipment wear rate by over 60%. Furthermore, the coolant lifespan is significantly extended compared to the comparative example. This is because the high filtration accuracy, high impurity removal rate, and high oil-water separation efficiency of this embodiment reduce the number of particles entering the equipment, directly leading to a lower equipment wear rate. The reduced impurities also slow down the oxidation rate of the coolant, reduce bacterial growth, and slow down the consumption of its effective components, thus extending the coolant lifespan and indirectly affecting the filter media replacement frequency.

[0069] The overall operating cost is the final economic benefit resulting from the combined effects of filter media replacement frequency, coolant lifespan, and equipment wear rate. The total operating cost in this embodiment is 35% lower than the comparative example. This is because the reduced filter media replacement frequency significantly reduces maintenance workload and consumable costs, the reduced equipment wear rate significantly extends equipment lifespan and lowers maintenance costs, and the extended coolant lifespan directly saves on coolant procurement and waste liquid disposal costs.

[0070] In summary, this embodiment, by improving filtration accuracy, not only optimizes the impurity removal rate and oil-water separation efficiency, but also significantly reduces equipment wear and maintenance costs, extends the service life of the coolant, and effectively reduces overall operating costs, thus demonstrating the efficient application of multi-stage filtration technology in coolant circulation systems.

[0071] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the invention.

Claims

1. A coolant circulation system for five-axis machining, characterized in that, It includes a processing area (1), a coolant return path (2), a multi-stage filtration unit (3), and a purified liquid storage tank (4). The multi-stage filtration unit (3) is located downstream of the coolant return path (2) and is connected to the purified liquid storage tank (4). The multi-stage filtration unit (3) includes a primary filtration module (31), a secondary precision filtration module (32), and a tertiary deep treatment module (33) connected sequentially along the coolant flow direction. The multi-stage filtration process for coolant used in five-axis machining includes the following steps: S1. Collection and pre-separation: Collect the coolant containing impurities in the processing area (1) and pre-separate it through a gravity settling tank; S2. Multi-stage filtration: The pretreated coolant is pumped into the multi-stage filtration unit (3) for step-by-step purification; a. Mechanical filtration is performed through the primary filtration module (31); b. Gradient precision filtration is performed through a two-stage precision filtration module (32); c. Centrifugal separation and magnetic adsorption are carried out simultaneously through a three-stage deep processing module (33); S3. Oil-water separation: The coolant that has undergone three-stage deep treatment is introduced into the oil-water separation unit (333). Under the conditions of temperature of 30-50℃ and flow rate of 0.5-2.0m / s, oil-water separation is carried out using oleophilic coalescing filter media (3331) and inclined plate settling tank (3332). S4. Storage and Regulation: The coolant after oil-water separation is transported to the purified liquid storage tank (4), and the pH value is calibrated using the pH adjustment electrode (42).

2. The coolant circulation system for five-axis machining according to claim 1, characterized in that, It also includes a liquid supply system (5), a control system (6), and a real-time turbidity monitor (7). Downstream of the purified liquid storage tank (4) are the liquid supply system (5), the control system (6), and the real-time turbidity monitor (7). The liquid supply system (5) pressurizes and delivers the coolant in the purified liquid storage tank (4) to the processing area (1).

3. The coolant circulation system for five-axis machining according to claim 1, characterized in that: The secondary precision filtration module (32) includes a bag filter (321) and a cartridge filter (322) arranged in parallel.

4. The coolant circulation system for five-axis machining according to claim 1, characterized in that, The three-stage deep processing module (33) includes a centrifugal separator (331), a magnetic adsorber (332), and an oil-water separation unit (333). The oil-water separation unit (333) includes an oleophilic coalescing filter material (3331) and an inclined plate settling tank (3332).

5. A coolant circulation system for five-axis machining according to claim 1, characterized in that: The purified liquid storage tank (4) is equipped with an ultrasonic sterilizer (41) and a pH adjustment electrode (42), and the pH adjustment electrode (42) is electrically connected to the control system (6).

6. A coolant circulation system for five-axis machining according to claim 1, characterized in that, In step S2, the gradient precision filtering includes: When the system flow rate is greater than 50 L / min, it automatically switches to the bag filter (321) path; When the system flow rate is ≤50L / min, it automatically switches to the cartridge filter (322) path and triggers the backwashing procedure.

7. A coolant circulation system for five-axis machining according to claim 1, characterized in that, In step S3, oil-water separation is carried out at 40-45°C and the flow rate is limited to the range of 0.8-1.2 m / s.

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