Cutting fluid changing assembly, cutting fluid circulating system and wire cutting machine

Abstract

The utility model provides a cutting fluid changing assembly, a cutting fluid circulating system and a wire cutting machine, the cutting fluid changing assembly comprises a fluid supply device, a second filtering device, a heat exchanger, a spraying device and a cutting fluid changing assembly, and a fluid collecting pool is used for collecting cutting fluid acting on a cutting area; the cutting liquid changing assembly is connected with the spraying device through the second filtering device and the heat exchanger in sequence so that cutting liquid can flow circularly, the liquid supply device is connected with a liquid supply opening of the funnel barrel, and a liquid discharging opening is formed in the liquid collecting pool; according to the cutting fluid circulation system, new cutting fluid can be input and old cutting fluid can be discharged in the cutting process, fluid supply balance in the cutting fluid circulation system is guaranteed, meanwhile, the content of silicon powder in the circulation cutting fluid is kept within a low range, and the risk of wire jumping or wire breaking caused by the fact that the content of the silicon powder in the cutting fluid is too high is reduced. In addition, the content of the silicon powder in the circulating cutting fluid can be adjusted by controlling the amount of the input new cutting fluid.

Description

TECHNICAL FIELD

[0001] The utility model relates to wire cutting equipment technical field, in particular to a kind of cutting fluid replacement subassembly, cutting fluid circulation system and wire cutting machine. BACKGROUND

[0002] In the field of wire cutting technology, the cutting wire in high speed is used to cut the workpiece (including but not limited to silicon rod, magnetic material, semiconductor, sapphire, silicon carbide and other materials) to realize cutting. For example, the wire cutting machine cuts the silicon rod. The silicon rod is fixed on the feeding mechanism during cutting, and the silicon rod is moved relative to the cutting wire net by the feeding mechanism to realize slicing. In order to ensure the cutting performance of the cutting wire, cutting fluid needs to be sprayed continuously during cutting. The first is to cool and lubricate the cutting wire, and the second is to flush the silicon powder after cutting. The cutting fluid circulation system in the prior art is usually a closed loop system. The cutting fluid is replaced only when the cutting is completed after being filled once during use. Therefore, as the cutting process proceeds, the content of silicon powder in the circulating cutting fluid gradually increases, which affects the spraying quality and may even cause the cutting wire net to break or skip. SUMMARY

[0003] To solve the above technical problems, the utility model technical scheme provides a cutting fluid replacement subassembly, a circulation system and a wire cutting machine, which can adjust the content of silicon powder in the cutting fluid circulation system during cutting, so that the cutting fluid has better cooling and lubricating effect, which is beneficial to improve the working performance of the cutting wire net, improve the spraying quality and cutting efficiency.

[0004] The utility model provides a kind of cutting fluid replacement subassembly, including collection pool and hopper cylinder body, the hopper cylinder body is set in the bottom of the collection pool, supply liquid port is provided on the hopper cylinder body, and drain liquid port is provided on the collection pool.

[0005] Further optimization of the utility model technical scheme, one-way valve is provided between the hopper cylinder body and the collection pool, and the one-way valve is used to prevent the cutting fluid filled in the supply liquid port from entering the collection pool.

[0006] Further optimization of the utility model technical scheme, the center of the collection pool is provided with a liquid leakage groove, the hopper cylinder body is arranged on the liquid leakage groove, and a first filter device is arranged in the liquid leakage groove.

[0007] Further optimization of the utility model technical scheme, further include overflow valve, the drain liquid port is arranged on the outer side of the liquid leakage groove on the collection pool, and the overflow valve is installed on the drain liquid port.

[0008] The number of funnel barrels is at least one, and all the funnel barrels are evenly arranged at the bottom of the liquid collecting pool.

[0009] A cutting fluid circulation system comprises a spraying device and the cutting fluid replacement assembly described above, the liquid collecting pool of the cutting fluid replacement assembly is used to collect the cutting fluid sprayed by the spraying device; and the cutting fluid replacement assembly is connected with the spraying device in sequence through the funnel barrels to enable the cutting fluid to flow circularly.

[0010] The utility model discloses further optimization technical scheme still includes liquid supply device, liquid supply device with liquid supply mouth is connected.

[0011] The utility model discloses further optimization technical scheme, liquid supply device is liquid supply cylinder, liquid supply cylinder with liquid supply mouth between through liquid supply branch pipe is connected with each other, or liquid supply device is centralized liquid supply system, and centralized liquid supply system passes through centralized liquid supply pipeline with liquid supply mouth is connected with each other.

[0012] The utility model discloses further optimization technical scheme, first liquid supply pump is arranged between funnel barrel and spraying device, second liquid supply pump and control valve are arranged between liquid supply device and liquid supply mouth respectively.

[0013] The utility model discloses further optimization technical scheme, and liquid supply branch pipe between liquid supply device and liquid supply mouth is provided with vice road flowmeter, heat exchanger is arranged between second filter device and spraying device, and main road flowmeter is arranged between heat exchanger and spraying device, and density meter is arranged between main flowmeter and spraying device, and density meter is used to detect the density of cutting fluid.

[0014] The utility model discloses further optimization technical scheme still includes second filter device and heat exchanger, and second filter device and heat exchanger are sequentially arranged between funnel barrel and spraying device, and return line is arranged between second filter device, funnel barrel, spraying device and liquid discharge mouth respectively.

[0015] A wire cutting machine comprises a cutting chamber and the cutting fluid circulation system or the cutting fluid replacement assembly described above, and the cutting fluid replacement assembly is arranged at the bottom of the cutting chamber.

[0016] The utility model discloses further optimization technical scheme, and the wire cutting machine is slicing machine.

[0017] Compared with the prior art, the utility model discloses the advantages of the technical scheme are:

[0018] By setting the liquid supply port for filling new cutting fluid and the liquid discharge port for discharging old cutting fluid in the cutting fluid replacement assembly, the input of new cutting fluid and the discharge of old cutting fluid are realized during the cutting process (the new cutting fluid described herein refers to unused cutting fluid, and the old cutting fluid refers to cutting fluid containing silicon powder after being sprayed by the spraying device), the adjustment of the silicon powder content in the circulating cutting fluid is realized while ensuring the liquid supply balance in the circulating system, thereby facilitating the silicon powder content in the entire cutting fluid circulating system to be maintained within a lower range, reducing the risk of wire skipping or wire breaking due to the excessively high silicon powder content in the cutting fluid, and reducing the risk of scratches on the cutting surface, thereby facilitating the improvement of cutting quality and cutting efficiency. In addition, by controlling the amount of new cutting fluid input, the adjustment of the silicon powder content in the circulating cutting fluid can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] In the following, the present application will be described in more detail based on embodiments and with reference to the drawings.

[0020] Figure 1 is a structural schematic view of the cutting fluid replacement assembly in the technical scheme of the present application;

[0021] Figure 2 is a structural schematic view of the cutting fluid circulating system in the technical scheme of the present application.

[0022] In the drawings, the same components are designated by the same reference numerals. The drawings are not drawn according to the actual proportions.

[0023] Label explanation:

[0024] 01 - cutting chamber; 02 - cutting mechanism; 1 - spraying device; 2 - liquid collecting pool; 21 - first filtering device; 22 - overflow valve; 23 - funnel cylinder; 24 - liquid collecting pool; 3 - liquid supply device; 31 - liquid supply branch; 4 - second filtering device; 5 - heat exchanger; 6 - trench; 61 - return pipeline; 71 - first liquid supply pump; 72 - second liquid supply pump; 81 - main road flow meter; 82 - auxiliary road flow meter. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “said,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise; “multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0027] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system including said element. In the description of this utility model, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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 utility model.

[0028] The following will be combined with the appendix Figures 1-2 The present invention will be further described below.

[0029] In the field of wire cutting technology, taking photovoltaic silicon rod cutting as an example, during the processing of silicon rods, the cutting wire generates heat and cutting powder (silicon powder) during the cutting process. To ensure the working performance of the cutting wire, cutting fluid is usually sprayed at the cutting position between the cutting wire mesh and the silicon rod. The purpose is to lubricate and cool the cutting wire, silicon rod, and other components, and to wash away the silicon powder generated during the cutting process. Therefore, when the wire cutting device is working, the silicon powder content in the circulating cutting fluid will gradually increase as the cutting time increases. Because wire cutting uses diamond wire with a diameter of 35-70μm and a cutting speed of up to 40m / s, the silicon powder generated is extremely fine, so the filtration device in the cutting fluid circulation system cannot filter it out. The increased silicon powder content in the cutting fluid leads to a decrease in lubrication and cooling effects, thereby increasing the probability of wire skipping or breakage, and may also cause scratches on the cutting surface, reducing cutting quality and efficiency. Because the cutting fluid circulation system in the existing technology is a closed-loop system, the cutting fluid that is pre-input into the supply cylinder before starting the machine can be used for circulation spraying during the cutting process. As a result, it is impossible to control or adjust the silicon powder content in the cutting fluid without stopping the machine, which is a problem of increased silicon powder content in the circulating cutting fluid during the cutting process.

[0030] In view of the problems in the prior art, the application provides a cutting fluid replacement assembly as shown in the drawings Figure 1 The cutting fluid replacement assembly comprises a liquid collecting pool 242 and a funnel cylinder 23, the funnel cylinder 23 is arranged at the bottom of the liquid collecting pool 242, a liquid inlet is arranged on the funnel cylinder 23, a liquid outlet is arranged on the liquid collecting pool 24, the cutting fluid is discharged through a liquid discharge pipeline, and the cutting fluid is optionally discharged to a trench 6 through the liquid discharge pipeline. New cutting fluid is input through the liquid inlet, and old cutting fluid is output through the liquid outlet, so that the content of silicon powder in the cutting fluid is controlled and adjusted.

[0031] Preferably, a one-way valve is arranged between the funnel cylinder 23 and the liquid collecting pool 242, so as to prevent the new cutting fluid filled in the liquid inlet from entering the liquid collecting pool 242 and causing waste of the new cutting fluid. During normal operation, the old cutting fluid collected in the liquid collecting pool 242 enters the next link through the funnel cylinder 23, but when the new cutting fluid is filled, if the flow of the new cutting fluid filled in the liquid inlet is too large, the new cutting fluid flows back into the liquid collecting pool 242. In order to avoid the waste caused by the new cutting fluid filled in the liquid inlet directly flowing out of the liquid outlet of the liquid collecting pool 242 to the trench 6, the one-way valve is arranged.

[0032] A liquid leakage groove is arranged at the center of the bottom of the liquid collecting pool 242, which is beneficial to the collection of the cutting fluid collected in the liquid collecting pool 24, so that the collected cutting fluid can participate in the spraying circulation. The funnel cylinder 23 is arranged on the liquid leakage groove, and a first filtering device 21 is arranged in the liquid leakage groove, so as to facilitate the preliminary filtration of the collected spraying cutting fluid. In a preferred embodiment, the first filtering device 21 is arranged in the liquid leakage groove in a conical shape (not shown in the figure), and the conical design can increase the filtering area and reduce the risk of blocking the first filtering device by cutting debris and other impurities. In this embodiment, the liquid outlet is arranged on the outside of the liquid leakage groove of the liquid collecting pool 24, and an overflow valve 22 is arranged on the liquid outlet. Because the volume of the cutting fluid required in the entire cutting fluid circulation system is certain, when the new cutting fluid is injected into the cutting fluid circulation system, the cutting fluid stored in the liquid collecting pool 24 also increases. After a certain amount of new cutting fluid is input, the liquid level of the cutting fluid in the liquid collecting pool 24 rises, and when the height reaches the overflow port height of the overflow valve, the cutting fluid containing silicon powder in the liquid collecting pool automatically overflows, so as to adjust the content of silicon powder in the circulating cutting fluid.

[0033] As shown in the drawings Figure 2As shown, the application also provides a cutting fluid circulation system, which comprises a liquid supply device 3, a second filter device 4, a heat exchanger 5, a spraying device 1 and the cutting fluid replacement assembly described above (wherein the second filter device 4 and the heat exchanger 5 can be selectively connected, and the embodiment is described according to the connection of the second filter device 4 and the heat exchanger 5). The liquid collecting tank 242 is connected to the spraying device 1 to collect the sprayed cutting fluid. The liquid outlet of the funnel cylinder in the replacement assembly is connected to the second filter device 4 through a first liquid supply pump 71 (for the convenience of description, the liquid supply pump on the main pipeline of the cutting fluid circulation system is named as the first liquid supply pump 71, and the liquid supply pump on the branch pipeline corresponding to the liquid supply port is named as the second liquid supply pump 72). The second filter device 4 is connected to the spraying device 1 through the heat exchanger 5, so that the cutting fluid can circulate in the cutting fluid circulation system. The liquid supply device 3 is connected to the liquid supply port of the funnel cylinder, so that new cutting fluid can be supplied to the cutting fluid circulation system during cutting. Specifically, during cutting, new cutting fluid is continuously added, old cutting fluid containing silicon powder is continuously discharged, and silicon powder contained in the old cutting fluid is also discharged, so that the content of silicon powder in the whole cutting fluid circulation system is reduced, and the content of silicon powder in the cutting fluid can be controlled and adjusted by adjusting the amount of replacement of new and old cutting fluid.

[0034] In order to further improve the filtering effect of the cutting fluid circulation system, two second filter devices 4 are arranged in the cutting fluid circulation system of the application. One of the second filter devices 4 is connected between the liquid collecting device and the heat exchanger, and the other second filter device 4 is connected between the heat exchanger 5 and the spraying device 1. During use, the circulating cutting fluid is subjected to double filtration, and large-particle impurities enter the spraying device, so as to avoid the risk of cutting wire breakage or skipping caused by large-particle impurities.

[0035] Since the cutting fluid circulation system circulates and sprays the cutting fluid contained in the use pipeline when the liquid supply device 3 does not input new cutting fluid, in order to meet the requirement of cutting fluid capacity during cutting, the funnel cylinder is arranged as one or more, and the capacity of the cutting fluid in the cutting fluid circulation system is increased by changing the volume or the number of the funnel cylinder.

[0036] The liquid supply device 3 in the technical solution of the application is a liquid supply cylinder or a liquid supply pipeline of a centralized liquid supply system, and preferably, a second liquid supply pump 72 is arranged on the branch pipeline to control the flow of the new cutting fluid. This design can also reduce the volume of the cutting device, because the volume of the liquid supply cylinder in the prior art is large, and the liquid supply cylinder is generally arranged at the bottom of the cutting device, and the cutting device needs to reserve space for storing the liquid supply cylinder. However, according to the technical solution, a new cutting fluid interface is arranged on the cutting device, and the space for storing the liquid supply cylinder is not necessary, so that the volume of the whole cutting device is reduced.

[0037] In order to facilitate control of the amount of new cutting fluid input in the cutting fluid circulation system, the technical scheme is further provided with a secondary flow meter 82 in the cutting fluid circulation system, which is arranged on the liquid supply branch 31 between the liquid supply device 3 and the new cutting fluid interface, and the amount of new cutting fluid supplement can be measured through the secondary flow meter 8.

[0038] The main flow meter 81 arranged between the heat exchanger and the spraying device 1 can facilitate monitoring of the amount of cutting fluid flowing into the spraying device 1. Preferably, a density meter is arranged on the main flow meter 81 or between the main flow meter 81 and the spraying device 1, which can detect the density of the cutting fluid in the cutting fluid circulation system in real time, and the concentration of the silicon powder in the cutting fluid can be calculated by using the density formula and the molar concentration formula. The amount of new cutting fluid supplement in the circulating cutting fluid can be controlled by setting a fixed safe density value or a safe silicon powder concentration value in the controller of the cutting fluid circulation system (when the concentration value is set, the conversion formula needs to be programmed into the controller, and when the density value is set, only the safe density value corresponding to a certain silicon powder concentration needs to be converted), so that the cutting fluid circulation system is more intelligent when working, and the spraying cutting operation can be performed by using the cutting fluid with the best performance.

[0039] In order to facilitate cleaning and discharge of the cutting fluid in the cutting fluid circulation system, the filter device 4, the heat exchanger 5 and the funnel cylinder 23 are respectively connected to the liquid discharge port through the backflow pipelines 61, and control valves are arranged on the corresponding backflow pipelines 61. After cutting, the residual cutting fluid in the cutting fluid circulation system can be directly discharged into the trench 6 by opening the control valves on the backflow pipelines 61, and then new cutting fluid can be filled into the cutting fluid circulation system through the liquid supply device 3, so that the next cutting can be directly performed, the operation of discharging and cleaning the used liquid supply cylinder in the prior art is avoided, the labor and material inputs are reduced, and the cutting efficiency is improved.

[0040] On the basis of the above embodiment, the application further provides a wire cutting machine, which comprises a cutting chamber, and is provided with the cutting fluid replacement assembly or the cutting fluid circulation system described above, and the cutting fluid replacement assembly is arranged at the bottom of the cutting chamber, so as to facilitate collection of the cutting fluid sprayed in the cutting chamber.

[0041] The working process of the wire cutting machine in the technical scheme of the application is as follows: in the initial state, the control valve between the liquid supply opening and the liquid supply device is opened, new cutting liquid is filled into the cutting liquid circulating system through the liquid supply opening of the funnel barrel, the new cutting liquid fills the entire cutting liquid circulating system, then the control valve between the liquid supply opening and the liquid supply device is closed, and the cutting work is started; with the cutting process, the silicon powder content in the initial injected cutting liquid gradually increases, according to the cutting progress, the control valve between the liquid supply device and the liquid supply opening is opened, and new cutting liquid is input (the flow of the input new cutting liquid can be determined according to the size of the silicon rod, the feeding speed and the diameter of the used cutting wire, that is, the flow of the new cutting liquid is determined according to the flow of the cut silicon powder), and the process is mainly to dilute the old cutting liquid with the new cutting liquid to adjust the silicon powder content in the cutting liquid; when the new cutting liquid is input to make the liquid level in the liquid collecting tank 24 reach the height of the liquid outlet of the overflow valve, the old cutting liquid containing silicon powder is discharged, so that the silicon powder content in the circulating cutting liquid is adjusted, the spraying quality is ensured, and the influence of the cutting wire net on the cutting quality under different cutting processes is reduced.

[0042] Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the protection scope of the utility model.

[0043] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or their combination.

[0044] Although the utility model has been described with reference to the preferred embodiments, various improvements can be made and the components therein can be replaced with equivalents without departing from the scope of the utility model. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cutting fluid exchange assembly comprising: The cutting fluid replacement assembly comprises a sump and a funnel cylinder, the funnel cylinder is arranged on the bottom of the sump, and a liquid supply opening is arranged on the funnel cylinder for supplying new cutting fluid to the funnel cylinder; and a liquid discharge opening is arranged on the sump for discharging the cutting fluid collected in the sump.

2. The cutting fluid exchange assembly of claim 1, wherein, A liquid leakage groove is arranged in the sump, the funnel cylinder is arranged on the liquid leakage groove, and a first filter device is arranged between the liquid leakage groove and the funnel cylinder.

3. The cutting fluid exchange assembly of claim 2, wherein, The liquid discharge opening is arranged outside the liquid leakage groove; an overflow valve is further arranged in the sump, and the overflow valve is arranged on the liquid discharge opening.

4. The cutting fluid exchange assembly of any one of claims 1-3, wherein, The number of the funnel cylinders is at least one, and all the funnel cylinders are uniformly arranged on the bottom of the sump.

5. A cutting fluid circulation system characterized by, The cutting fluid replacement assembly is arranged in the cutting chamber. The cutting fluid replacement assembly is connected with the spraying device through the funnel cylinder to enable the cutting fluid to flow in a circulation manner.

6. The cutting fluid circulation system of claim 5, wherein, A liquid supply device is further arranged, and the liquid supply device is connected with the liquid supply opening.

7. The cutting fluid circulation system of claim 6, wherein, The liquid supply device is a liquid supply cylinder, and the liquid supply cylinder is connected with the liquid supply opening through a liquid supply branch pipe; or the liquid supply device is a centralized liquid supply system, and the centralized liquid supply system is connected with the liquid supply opening through a centralized liquid supply pipeline.

8. The cutting fluid circulation system of claim 6, wherein, A first liquid supply pump is arranged between the funnel cylinder and the spraying device; and a second liquid supply pump and a control valve are respectively arranged between the liquid supply device and the liquid supply opening.

9. The cutting fluid circulation system of any of claims 6-8, wherein, A second filter device and a heat exchanger are further arranged between the funnel cylinder and the spraying device in sequence, and a return pipeline is arranged between the second filter device, the funnel cylinder, the spraying device and the liquid discharge opening.

10. The cutting fluid circulation system of claim 5, wherein, A one-way valve is arranged between the funnel cylinder and the sump, and the one-way valve is used to prevent the new cutting fluid filled in the liquid supply opening from entering the sump.

11. The cutting fluid circulation system of claim 9, wherein, A secondary flow meter is arranged in the liquid supply branch pipe between the liquid supply device and the liquid supply opening; a heat exchanger is arranged between the second filter device and the spraying device, a primary flow meter is arranged between the heat exchanger and the spraying device, a density meter is arranged between the primary flow meter and the spraying device, and the density meter is used to detect the density of the cutting fluid.

12. A wire saw, characterized in that The cutting fluid circulation system or the cutting fluid replacement assembly is arranged in the cutting chamber.

13. The wire saw as claimed in claim 12, characterized in that The wire cutting machine is a slicing machine.

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