JP2003039274A - Cutting liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress propagation of anaerobic bacteria in a coolant while minimizing clogging of a nozzle by foreign matter by maintaining water power of the coolant without increasing power consumption of a coolant pump and a jet flow of coolant. SOLUTION: Bubbles charged with negative ion occurring in a negative ion generator is mixed in a coolant in the piping to a coolant nozzle 4 through the medium of an air supply device 10. The mixed bubble abruptly expands in a jet from the nozzle to enhance water power of the coolant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool for cutting or grinding metals.

[0002]

2. Description of the Related Art In cutting or grinding with a machine tool, a nozzle is usually used for the purpose of cooling or lubrication, and a cutting oil is jetted and supplied to a contact portion of a cutting tool and a workpiece during processing. . At the same time, in order to efficiently remove the chips accumulated in the processing site to the chip storage tank outside the processing unit, the cutting oil is jetted and discharged.
As the cutting oil used above, a water-soluble cutting fluid (hereinafter referred to as a coolant) is used from the viewpoints of cooling performance and easy separation of foreign substances mixed in the oil. recent years,
Dry processing has also been developed in which machining is performed without supplying coolant to the cutting tool during processing, but in order to ensure that the accumulated chips generated during processing are flushed out to a specified external chip storage tank in a short time. For this purpose, it is desirable that the coolant be ejected from the nozzle to be washed away. When no coolant is used, the scattered chips cannot be surely discharged in a short time to an externally determined chip storage tank simply by blowing with air having a smaller specific gravity than the coolant. Therefore, it is necessary to artificially blow off the cutting chips with an air gun or the like after the completion of processing. Therefore, even after dry machining has been developed, it is practically impossible to eliminate the use of coolant from the machine tool in order to continuously and efficiently remove chips in a predetermined place. Is.

As the prior art 1, Japanese Patent Laid-Open No. 10-6174 discloses a machining center in which a plurality of nozzles are provided in a pipe having a small fluid resistance so as to strengthen the water flow of the coolant and wash the chips in the machined part without delay. A mechanical chip recovery device is disclosed.

FIG. 9 is a block diagram showing an outline of the chip collecting apparatus shown in the prior art 1. The coolant pipe 103 is rectangular and has a large cross-sectional area to reduce fluid resistance, and the plurality of nozzles 105 connected to the coolant pipe 103 vigorously eject the coolant as much as the fluid resistance decreases. It is said that.

Separately, as the prior art 2, Japanese Patent Laid-Open No. 7-3
In 1972, a wide layered air flow generator 110 is used to remove the floating oil in the upper layer of the coolant from the floating oil recovery device 150.
An oil / water separation device for a coolant for a machine tool is disclosed that removes oil from the coolant by introducing the oil into the coolant.

FIG. 10 is a plan view showing the structure of the oil / water separator shown in the prior art 2. Layered air flow generator 1
The operations of starting and stopping 10, the coolant circulation pump 112, and the floating oil recovery device 150 are separately controlled by a control device (not shown). In the figure, 112 is a coolant pump, 117 is a coolant storage tank, 110 is a stratified air flow generator, 111 is an air flow flow, 81 is a floating oil flow, and 82 is a coolant flow after passing through the floating oil recovery device 150. Indicates.

As an effect of the above configuration, since an air flow generator for blowing a horizontally wide laminar air flow along the liquid surface of the coolant tank is provided, the oil component floating on the liquid surface of the coolant tank is provided. Is pushed by the layered air flow, and a flow of oil is generated in the upper layer portion of the coolant tank so that the floating oil recovery device 150 can easily approach.

[0008]

With respect to the above-mentioned conventional technique, since the conventional technique 1 uses a plurality of nozzles,
When using a nozzle with the same hole diameter as before, the coolant flow rate increases in proportion to the number of nozzles,
The ejection pressure of the coolant ejected from one nozzle is reduced by the increased number.

Further, in a pump for an incompressible fluid such as water or oil, the flow rate and the power consumption are generally in a substantially proportional relationship.
As the coolant flow rate increases, so does the power consumption. As mentioned above, if the jetting pressure of the coolant decreases due to the increase in the number of nozzles, the water force for flushing the chips in the processing part without delay will also decrease.Therefore, in order to prevent malfunctions, the coolant feeding capacity of the coolant pump should be reduced. It needs to be larger than before, resulting in further increase in power consumption. Even if the number of nozzles is increased to a plurality, if the total opening area of all nozzles is made equal to the total opening area of conventional nozzles, the coolant flow rate will not increase and power consumption can be prevented from increasing. Since the opening cross-sectional area of the nozzle is reduced by a factor of several, the nozzle opening may be smaller than before due to minute foreign matter, such as rust debris in pipes, debris from equipment coating, and unfiltered chips. This results in a closed state at an early stage, and a new problem arises in that the nozzle must be frequently maintained in order to remove foreign matter that remains in the nozzle.

Further, in the prior art 2, the floating oil in the upper layer portion of the coolant is tried to be guided to the floating oil recovery device by a widened layered air flow, but when the shape of the coolant tank is not a simple rectangular shape, However, it is difficult to reliably guide the floating oil to the oil-water separation device in a short time only by the layered air flow, because the flow of the floating oil causes stagnation depending on the installation location of the layered air flow generator. Furthermore, it is said that the removal of floating oil in the upper layer of the coolant can prevent the growth of anaerobic bacteria in the coolant, but in reality, the amount of oil adhering to the coolant tank and the mechanical lubricating oil that oozes out during processing are slightly Since it continuously flows into the coolant, an oil film is formed between the coolant surface and the air even if the thickness is extremely small. As a result, direct contact between the coolant and air is almost eliminated, and it is almost impossible to prevent the growth of anaerobic bacteria. Even if the oil film can be completely removed, the range where the coolant and the air come into direct contact is limited to the plane area of the coolant tank, so the coolant and the air may come into direct contact in the depth direction of the coolant. Therefore, it is difficult to effectively and effectively prevent the reproduction of anaerobic bacteria.

To summarize the above-mentioned problems, problems related to the coolant in the machine tool occur due to energy problems related to the power consumption of the coolant pump, quality problems related to nozzle blockage due to foreign matter, maintainability problems, and coolant decay. There are work environment problems due to offensive odors, and industrial waste problems where coolant life is shortened due to spoilage and deterioration of coolant, resulting in increased coolant usage.

The inventor of the present invention has conducted intensive research and has been able to realize a good working environment in which the coolant nozzles are less likely to be clogged in machine tools, energy can be saved, and waste can be reduced, and odors can be reduced. Invented the device.

In view of the above situation, the present invention is capable of effectively discharging the chips to the coolant reservoir tank without increasing the coolant flow rate for the purpose of solving the problem, and the power consumption of the coolant pump and the factory. A technical problem is to achieve the same effect as before even if the power consumption of the air source is reduced, and to more effectively suppress or reduce the growth of anaerobic bacteria.

[0014]

In order to solve the above-mentioned technical problems, the technical means taken in the invention of claim 1 of the present invention is to store a water-soluble cutting fluid used when processing a metal. In the machine tool, a pump for pumping the water-soluble cutting fluid is provided in the middle of the first pipe connected to the nozzle for ejecting the water-soluble cutting fluid from the tank to the metal working portion. A cutting fluid supply device is characterized in that an air supply means is connected to the middle of a first pipe arranged between the pump and the pump.

According to the above technical means, when air is mixed from the outside into the incompressible coolant pumped in the pipe, the air reaches the nozzle together with the coolant at the same pressure as the coolant in the pipe. The coolant that has flowed immediately before the mixed air because it rapidly expands to about atmospheric pressure near the opening of the nozzle is further vigorously pushed forward by the expanded air. Generally, the calculation formula of the collision force of the nozzle jet water is expressed as follows.

H = γ · Q · Cv · V / g = ρ · Q · Cv · V where V = Cq 2 · g · h H: collision force [kgf] γ: specific weight [kgf / m ³ ] g: acceleration of gravity [m / s ² ] ρ: density [kg · s ² / m ⁴ ] Q: liquid flow rate [m ³ / s] V: flow velocity immediately after exiting the nozzle [m / s] h: pressure Head [m] Cv: Flow velocity decay coefficient in the atmosphere Cq: Flow coefficient As can be seen from the above formula, according to the above technical means, the flow velocity V immediately after exiting the nozzle is further accelerated by the rapid expansion of the mixed air. As a result, the collision force H is increased as compared with the conventional case, and the water force for flushing the chips in the processing portion is increased, and even if foreign matter is about to be clogged in the nozzle opening, it is vigorously pushed outside the nozzle. Since it is discharged, the function of the nozzle is normally maintained for a long time. Since the nozzle part is less likely to be clogged, the collision force per unit area can be improved even if the opening cross-sectional area of the nozzle is further reduced, and the flow rate of the coolant ejected from the nozzle can be reduced, so the capacity of the coolant pump can be reduced. It can be reduced to reduce power consumption.

Further, in order to prevent the coolant from flowing backward from the air supply means, that is, the air supply device, provided in the middle of the pipe connecting the nozzle and the coolant pump in the machining section of the machine tool, the second aspect of the present invention is described. Thus, it is preferable to connect the air supply device to the first pipe via the check valve.

Further, as technical means specifically taken to solve the above-mentioned problems, as shown in claim 3 of the present invention, the air supply means introduced into the first pipe is: It is configured to have an air supply device configured to attract the ambient air into the pipe by utilizing the flow of the water-soluble cutting fluid.

That is, by providing an orifice in the coolant pipe in the air supply device, a flow having a dynamic pressure larger than that in the pipe portion is generated in the orifice portion, which induces a decrease in static pressure. For example, even if the discharge pressure of the coolant pump is 0.2 MPa, immediately after the orifice, the static pressure in the coolant pipe becomes equal to or lower than the atmospheric pressure due to the increase in the coolant flow velocity, that is, the increase in the dynamic pressure. It has been confirmed by experiments that it is introduced into the coolant. This phenomenon can also be confirmed by a modified equation derived from Bernoulli's equation shown below.

Here, P ₂ : static pressure [kgf / m ² ] of the orifice portion P ₁ : static pressure of the piping portion [kgf / m ² ] γ: specific weight [kgf / m ³ ] g: acceleration of gravity [ m / s ² ] w ₁ : flow velocity in pipe [m / s] w ₂ : flow velocity in orifice [m / s] In the above formula, the orifice diameter is selected so that the flow velocity w ₂ in the orifice becomes an optimum value. By doing so, the static pressure P ₂ of the orifice portion can be made a negative pressure lower than the atmospheric pressure. Therefore, since air is mixed in the coolant pipe, electric power for an air compressor or the like is unnecessary, and energy can be saved.

Since the flow velocity of the coolant is not sufficiently developed at the time of starting and stopping the coolant pump, the static pressure of the orifice portion does not fall below atmospheric pressure, and the coolant is temporarily introduced from the air pipe that is originally introduced into the atmosphere. Since it flows back to the side, the check valve in the air supply device effectively operates to prevent this. The bubbles introduced into the coolant via the air supply device are mixed in small bubbles because the amount of the mixed air is very small compared to the flow rate of the coolant. These air bubbles mix with the coolant and have the effect of suppressing the growth of anaerobic bacteria in the coolant. Therefore, even if oil is present in the coolant, it is possible to suppress the generation of gas that gives off a bad odor such as hydrogen sulfide from the coolant. .

Separately, as described in claim 4 of the present invention, an air compressor is used as the air supply means introduced into the first pipe.

That is, the discharge pressure of the air compressor is controlled so as to be equal to or higher than the pressure boosted by the coolant pump,
If compressed air is mixed into the coolant,
A cutting fluid supply device provided with an air supply device can be provided with a simple structure in which a thin branch pipe for mixing air and a check valve are additionally provided in a conventional coolant pipe.

According to a fifth aspect of the present invention, the technical means is provided with a means for intermittently controlling the air introduced into the first pipe.

As described above, by intermittently supplying air into the coolant, the pressure inside the pipe is intermittently changed to reduce the clogging of foreign matter in the nozzle portion, and to prevent anaerobic growth in the coolant. Even if sexual bacteria are supplied with air into the intermittent coolant, the growth of anaerobic bacteria can be suppressed, and the amount of air supplied to the coolant can be reduced, which enables energy saving.

Next, in order to solve the above technical problems,
According to a sixth aspect of the present invention, the technical means uses an electromagnetic shutoff valve, a pneumatic shutoff valve or a rotary valve as a means for intermittently controlling the air.

That is, in the case where air is intermittently supplied to the coolant in the pipe, if the compressor is started and stopped each time, a time delay will occur until a predetermined air pressure is reached, or the compressor motor Since the power is turned on and off, there is a problem that a high starting current frequently flows.Therefore, to control the supply of air into the coolant intermittently only when necessary, use a control device (not shown) to control the electromagnetic shutoff valve and pneumatic pressure. By driving the blocking valve or the rotary valve, it is possible to reliably and stably supply the air intermittently.

In order to solve the above technical problem, the technical means taken in claim 7 of the present invention is such that a negative ion generator is arranged in the air supply means.

That is, the air bubbles containing negative ions introduced into the coolant through the air supply device mix with the coolant and exert the effect of suppressing the growth of anaerobic bacteria in the coolant and the bactericidal effect. Even if oil is present, it is possible to remarkably suppress the generation of gas that gives off a bad odor such as hydrogen sulfide from the coolant.

In order to further solve the technical problem, the technical means taken in claim 8 of the present invention is the second branching in the middle of the first pipe connecting the air supply device and the nozzle. Of the second pipe, and the tip of the second pipe on the side not connected to the first pipe is immersed in the water-soluble cutting fluid remaining in the tank, and in the middle of the second pipe. It is configured to have a relief valve.

That is, the capacity of the coolant pump is determined by the specifications and quantity of the nozzles, but the coolant pressure and flow rate required by the nozzles and the number of nozzles vary with each machine tool, and therefore the capacity of the coolant pump. There are various types. However, if a situation occurs such that the capacity of the coolant pump is insufficient, problems will occur during machining, so it is common for a machine tool to be equipped with a pump with a large capacity, which allows for a margin in advance.

Therefore, in addition to the flow rate required for processing, an excess amount of coolant will flow out from the nozzle. If only the minimum required flow rate is made to flow from the nozzle, the extra coolant will increase the discharge pressure of the pump because there is no place to go, resulting in overloading of the pump and the drive motor, and damage to the pump and motor. Will be invited. Therefore, in order to keep the discharge pressure of the pump constant, a bypass pipe (second pipe) provided with a relief valve is provided in front of the nozzle opening, and unnecessary coolant is passed through the bypass pipe (second pipe). By returning to the coolant storage tank, it becomes possible to protect the pump and drive motor from overload. By this bypass pipe (second pipe), the excess coolant mixed with air is returned to the coolant storage tank, whereby the effect of suppressing the growth of anaerobic bacteria can be exerted. By further immersing the tip of the bypass pipe in the liquid in the coolant storage tank, the coolant in the coolant storage tank is agitated with the coolant containing bubbles, so that the anaerobic bacteria in the coolant are The effect of further suppressing breeding is exhibited, and even if oil is present in the coolant, it is possible to further suppress generation of a gas that emits a foul odor such as hydrogen sulfide from the coolant.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
It will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a cutting fluid supply apparatus of an embodiment.

This cutting fluid supply device is used for the machining section 1 of a machine tool.
A coolant pump 2 for pumping coolant to the coolant, a coolant pipe 3, a machining coolant nozzle 4, a chip discharge nozzle 5, a coolant return pipe 6, a coolant reservoir 7, a filter plate 7a, a coolant 8, a three-way switching valve 9, an air Supply device 10, check valve 11, air intake pipe 1
2. The air intake 12a and the like.

The coolant 8 pressure-fed by the coolant pump 2 from the coolant storage tank 7 is passed through the air intake port 12a, the air intake pipe 12 and the check valve 11 in the air supply device 10 provided in the middle of the coolant pipe 3. It is mixed with the introduced air. The coolant mixed with bubbles is appropriately supplied to the machining coolant nozzle 4 or the chip discharging nozzle 5 by the three-way switching valve 9. The coolant mixed with cutting chips ejected from the nozzle is circulated to the coolant storage tank 7 through the coolant return pipe 6.

The bubbles supplied to the coolant in the pressurized coolant pipe undergo a rapid expansion immediately after being ejected from the nozzle so as to reach substantially atmospheric pressure. At that time, the coolant that was flowing immediately before the bubbles is pushed further forward and accelerated, so the collision force increases more than in the state in which there are no bubbles in the coolant, and the chips in the processing part are kept in a stable state. The water force to wash out increases. In addition, even if foreign matter is clogged near the nozzle opening, the foreign matter is expelled to the outside of the nozzle due to the rapid expansion force of the bubbles, so that the function of the nozzle is normally maintained for a long time. Until now, attempts have been made to reduce the opening cross-sectional area of the nozzle in order to improve the water flow of the coolant sprayed from the nozzle, but reducing the opening cross-sectional area tends to cause clogging by foreign matter in the nozzle, so it can be reduced so much. There wasn't. Therefore, in order to vigorously eject from a relatively large nozzle diameter, a larger coolant flow rate was required, and thus a larger pump energy was required. On the other hand, as described above, it is possible to avoid the clogging of foreign matter in the nozzle portion due to the rapid expansion of the bubbles, so that the opening cross-sectional area of the nozzle is further reduced to improve the water force, that is, the collision force per unit area. be able to. Further, since the flow rate of the coolant jetted from the nozzle can be reduced, the capacity of the coolant pump 2 can be reduced and the power consumption can be reduced.

FIG. 2 is a block diagram showing the outline of a cutting fluid supply apparatus according to another embodiment in which air is mixed into the coolant pipe using an orifice.

By providing the orifice 13 in the coolant pipe 3 in the air supply device 10 shown in FIG. 1, it is possible to introduce and introduce the external atmosphere into the coolant pipe 3 without power, so that further energy saving can be achieved. The orifice may be either a variable orifice or a fixed orifice. Incidentally, FIG. 3 is a principle of Bernoulli showing the relationship between the static pressure P ₁ in the static pressure P ₂ and the coolant pipe 3 at the orifice section, as always P ₂ in the steady state becomes lower than the atmospheric pressure vacuum Select the orifice diameter. Therefore, when the coolant pumped by the circulation pump continues to flow in the orifice portion at a constant flow rate or more, the air is mixed into the coolant pipe, so that electric power for the air compressor or the like is not required, thus saving energy. Start the coolant pump 3
Since the flow velocity of the coolant is not sufficiently developed at the time of stop, the static pressure in the pipe does not become lower than the atmospheric pressure even in the orifice portion, and the coolant temporarily flows back to the atmosphere side from the originally introduced air pipe 12. Therefore, the check valve 11 in the air supply device 10 operates effectively in order to prevent this. The air bubbles introduced into the coolant via the air supply device 10 mix with the coolant and have an effect of suppressing the growth of anaerobic bacteria in the coolant, so that even if oil is present in the coolant, it is sulfided from the coolant. It is possible to suppress the generation of offensive odor gas such as hydrogen.

FIG. 4 shows an example of an orifice based on the above principle.

FIG. 5 is a block diagram showing the outline of a cutting fluid supply apparatus according to another embodiment. Although an air compressor 60 is used as the air source of the air supply device 10 in FIG. 1, a factory compressor may be used in a broad sense. That is, when the discharge pressure of the air compressor is controlled so that the compressed air is mixed into the coolant so that the pressure becomes higher than the pressure boosted by the coolant pump 2, the air intake pipe 12 for mixing the air into the conventional coolant pipe is used. The cutting fluid supply device provided with the air supply device can be configured with a simple structure in which the check valve 11 is additionally provided.

FIG. 6 is a block diagram showing an outline of a cutting fluid supply apparatus according to another embodiment in which a mechanism for intermittently supplying air is provided.

A mechanism for intermittently supplying air is provided in the middle of the air pipe 12 connecting the air supply device 10 and the air compressor 60 in FIG. 5, and an electromagnetic shutoff valve 61 is used in the figure. However, a pneumatic shutoff valve or a rotary valve may be used as long as it can supply air intermittently. That is, even if air is intermittently supplied to the coolant in the pipe, the clogging of the nozzle portion can be reduced, and the speed of anaerobic bacteria breeding can be suppressed low. Further, the intermittent supply of air rather than the continuous supply of air into the pipe can reduce the flow rate of the air, thus saving energy.

FIG. 7 is a block diagram showing the outline of a cutting fluid supply apparatus according to another embodiment.

A negative ion generator 14 is provided on the air source side of the air supply device 10 of FIG. 2, and the atmosphere introduced from the air intake 12a contains the negative ions generated by the negative ion generator 14 and the check valve 11 Air supply device 10 via
It is introduced into the coolant pipe 3 from the orifice portion 13 of. The bubbles containing the negative ions mix with the coolant in the coolant pipe 3 to exert an effect of suppressing the growth of anaerobic bacteria in the coolant and a sterilizing effect. Therefore, even if oil is present in the coolant, hydrogen sulfide is removed from the coolant. It is possible to remarkably suppress the generation of gas that gives off a bad smell such as

FIG. 8 is a block diagram showing the outline of a cutting fluid supply apparatus according to another embodiment.

The air supply device 10 and the three-way switching valve 9 shown in FIG.
The branch pipe 15 is provided in the middle of the coolant pipe 3 for connecting the above, the relief valve 16 is provided in the middle of the branch pipe 15, and the tip end 15a of the branch pipe is immersed in the coolant 8 of the coolant storage tank 7. The atmosphere introduced from the air intake 12a passes through the check valve 11 and the air supply device 1
0 to the orifices 13, respectively. The bubbles sent from the orifice 13 to the coolant pipe 3 mix with the coolant and are carried toward the nozzle. And
Except for being sent to the nozzle selected by the three-way switching valve 9, excess coolant is used for the relief valve 1 provided in the branch pipe 15.
It is returned to the coolant storage tank 7 through 6.

At this time, since air bubbles are mixed in the coolant returned to the coolant storage tank 7, the coolant is agitated together with the coolant remaining in the coolant storage tank 7.
Therefore, it exerts the effect of suppressing the reproduction of anaerobic bacteria in the coolant. In addition to the configuration of FIG. 8, an air supply device 1 having a negative ion generator 14 as shown in FIG.
If 0 is used, a sterilizing effect is further added, and therefore even if oil is present in the coolant, it is possible to suppress the generation of gas that gives off a bad odor such as hydrogen sulfide from the coolant.

With the above construction, for example, when the machine tool is not used for a certain number of days such as consecutive holidays in summer, when the coolant in the machine remains in the coolant storage tank 7, anaerobic bacteria in the coolant propagate. Therefore, if the coolant pump 2 is steadily operated at a low speed, it is possible to suppress the growth of the anaerobic bacteria. In this case, since the coolant flow rate required for machining is not required, an orifice suitable for the flow rate may be used. If possible, if a variable orifice is used, the amount of air sent into the coolant pipe 3 can be easily adjusted. Alternatively, it is also possible to consider that a pump having a smaller pump capacity than the coolant pump 2 is newly provided in parallel with the coolant pump 2. If a dedicated bypass pipe for circulating the coolant is provided, the air supply device is constantly operated, and the coolant remaining in the coolant storage tank 7 and the coolant mixed with the air are agitated, It is possible to suppress or reduce the reproduction of anaerobic bacteria. In this case, as described above, it is sufficient to circulate the coolant with a pump having a smaller capacity than the coolant pump 2 normally used, so that energy saving can be achieved.

[0049]

As described above, according to the present invention, air bubbles are mixed in the coolant, and the clogging of the nozzles is reduced by utilizing the force of the bubbles rapidly expanding when the nozzles are jetted, and the coolant jetted from the nozzles is also used. Significantly increase the water pressure.
Since the nozzles are less likely to be clogged due to the above effects, it is possible to employ a nozzle having a smaller diameter and reduce the flow rate of the coolant pump. In addition, since air bubbles are mixed into the coolant, the effect of suppressing the growth of anaerobic bacteria occurs, and by mixing air bubbles with negative ions added into the coolant, in addition to the effect of suppressing the growth of anaerobic bacteria. It also has a bactericidal effect. Therefore, even if oil is present in the coolant, the cutting fluid supply device can remarkably suppress the generation of gas that gives off a bad odor such as hydrogen sulfide from the coolant. In other words, by increasing the water flow of the coolant from the nozzle, it is possible to realize a nozzle that is less likely to be clogged with foreign matter, has excellent maintainability, and can reduce the capacity of the coolant pump. Becomes In addition, the life of the coolant is extended, so that it is possible to save resources and reduce industrial waste (disposal of the coolant), reduce maintenance costs, reduce power consumption, and improve the working environment. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a cutting fluid supply device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a cutting fluid supply device for mixing air into a coolant pipe using an orifice according to another embodiment of the present invention.

FIG. 3 is a diagram showing the principle of Bernoulli applied in the embodiment of the present invention.

FIG. 4 is an example of an orifice according to another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a cutting fluid supply device using an air compressor as an air source in another embodiment of the present invention.

FIG. 6 is a configuration diagram showing an outline of a cutting fluid supply device according to another embodiment of the present invention in which a mechanism for intermittently supplying air is provided.

FIG. 7 is a schematic configuration diagram of a cutting fluid supply device provided with a negative ion generator according to another embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a cutting fluid supply device that circulates excess coolant by a branch pipe in another embodiment of the present invention.

FIG. 9 is a chip collecting device in a machining center shown in Related Art 1.

FIG. 10 is a schematic plan view of an oil / water separator shown in Related Art 2.

[Explanation of symbols]

1 Processing Part, 2 Coolant Pump, 3 Coolant Piping 4 Processing Coolant Nozzle, 5 Chip Discharge Nozzle 6 Coolant Return Pipe, 7 Coolant Storage Tank 7a Filter Plate, 8 Coolant, 9 Three-way Switching Valve 10 Air Supply Device, 11 Check valve, 12 Air intake pipe 12a Air intake port, 13 Orifice 14, Negative ion generator, 15 Branch pipe, 16 Relief valve 60 Air compressor, 61 Electromagnetic stop valve 70 Second air supply device, 71 Second Check valve, 7
3 Second orifice

Claims (8)

[Claims] 1. A first pipe connected to a nozzle for ejecting the water-soluble cutting fluid from a tank for storing the water-soluble cutting fluid used for processing the metal to a metal processing portion, in the middle of the first pipe. A machine tool provided with a pump for pumping a water-soluble cutting fluid, characterized in that an air supply means is connected in the middle of a first pipe arranged between the nozzle and the pump. Cutting fluid supply device. 2. The cutting fluid supply apparatus according to claim 1, wherein the air supply unit is connected to the first pipe via a check valve. 3. The air supply means introduced into the first pipe has an air supply device configured to attract ambient air into the pipe by utilizing the flow of the water-soluble cutting fluid. The cutting fluid supply device according to any one of claims 1 and 2, which is characterized. 4. The cutting fluid according to claim 1, wherein the air supply means introduced into the first pipe is an air supply device using an air compressor. Supply device. 5. The cutting fluid supply device according to claim 1, further comprising means for intermittently controlling the air introduced into the first pipe. 6. The cutting fluid supply apparatus according to claim 5, wherein an electromagnetic stop valve, a pneumatic stop valve or a rotary valve is used as the means for intermittently controlling the air. 7. The cutting fluid supply apparatus according to claim 1, wherein the air supply unit is provided with a negative ion generator. 8. A second pipe that branches in the middle of the first pipe that connects the air supply device and the nozzle is connected, and a second pipe that is not connected to the first pipe is connected. 8. The relief valve is provided in the middle of the second pipe while the tip is immersed in the water-soluble cutting fluid remaining in the tank.
The cutting fluid supply device according to the item.