JP2003136365A - Lubricating and cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost lubricating and cooling device having excellent lubricating and cooling effect, without much damaging environments. SOLUTION: An oil mist generating device 10 comprises a quantitative oil supply device 11, and an oil ultrasonic device 12 to receive oil from the quantitative oil supply device, and apply ultrasonic waves for atomizing. A water mist generating device 20 comprises a quantitative water supply device 21, and a water ultrasonic device 22 to receive water from the quantitative water supply device, and apply ultrasonic waves to it for atomizing. A mixing device 30 comprises a mixing chamber 33 to which an oil mist feed tube 31 to carry oil mist from the oil mist generating device 10 by an air current, and a water mist feed tube 32 to carry water mist from the water mist generating device by an air current are connected. Oil mist and water mist are fed into the mixing chamber from both feed tubes to be mixed in the mixing chamber, so that oil mist is attached to the surface of water mist to form oil film. The mixing chamber is connected to a nozzle device 40, and the oil film-attached water mist is sprayed from the nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of lubrication and cooling, and in particular, in cutting a metal material, in order to improve the effects of lubrication and cooling of the blade, an oil film-attached water mist is sprayed on the blade. The present invention relates to a lubricating cooling device.

[0002]

2. Description of the Related Art While low pollution is strongly demanded, it is also desired that the amount of oil used and the effect be great in lubrication and cooling between a blade and a workpiece during cutting. Therefore, it has recently been proposed and widely practiced to spray a water particle having an oil film formed on the surface thereof to a cutting portion to lubricate mainly with oil and cool with water.

As a method of forming the above-mentioned oil film-attached water mist, there is, for example, the one disclosed in Japanese Patent Laid-Open No. 2000-218466. According to this method, the principle of atomization is applied to generate oil mist by compressed air, and water mist is generated by compressed air containing this oil mist, and the oil mist adheres to the water mist surface to form an oil film. Is forming.

The water mist attached to the oil film, which is generated by the method of the principle of mist blowing, has a relatively large weight with a particle size of 100 to 700 μm, so that even if the lubrication cooling part is located far away, its inertia You can inject accurately and intensively by
Further, since the amount of oil that adheres to form a film is about 1/100 of that of water, the generation of oily smoke due to frictional heat during cutting is relatively small.

[0005]

However, in the above-mentioned known method, the particle diameters of the oil mist and water mist generated by the principle of atomization using compressed air are such that the pressure and flow rate of the compressed air flow are different from each other. The atomization occurrence state varies depending on the operating condition, and even if the variation in the condition is small, a large difference occurs in the diameter of the generated particles.

Particularly, the oil atomization by the above-mentioned known method is significantly affected by the viscosity of the oil, and the difference in particle size is large. Those having a large oil particle diameter flowing through the conduit have a drawback that they cannot adhere to the water mist efficiently because they adhere to the inner wall of the conduit or drip.

In order to make up for such a drawback, in another known example, for example, Japanese Patent Laid-Open No. 2001-150294, in order to efficiently attach the oil to the water mist, the dripping oil is collected and a bypass passage is provided. , The oil is again atomized with compressed air to form a fine oil mist layer, which is attached to the water mist. In this measure, a double or triple re-oil atomization method is also proposed. However, even with this method, the efficiency of recovering the oil as a whole can be improved, but the problem of variation in diameter of water mist and oil mist cannot be basically solved. Therefore, the variation in the diameter of the water mist does not reach the predetermined part intensively because the diffusion and the range of the spray spread when the water mist attached with the oil film is ejected from the nozzle, and the diameter of the oil mist is The variation leaves a problem that an excessively adhered oil film causes oil smoke.

In view of the above situation, the present invention can generate a water mist having an extremely small diameter and an oil mist with almost no variation in diameter, and can accurately inject a water mist attached with an oil film to a predetermined portion, thereby producing oil and water. It is an object of the present invention to provide a device having excellent lubrication and cooling effects even if the consumption amount is small.

[0009]

A lubrication cooling device according to the present invention mixes an oil mist generator and a water mist generator with the generated oil mist and water mist to form an oil film on the surface of the water mist. It is provided with a mixing device and a nozzle device for ejecting an oil film-attached water mist.

In such a lubrication cooling device, the present invention provides
The oil mist generator has a fixed oil supply device and an oil ultrasonic device for receiving oil from the fixed oil supply device and applying ultrasonic waves to the oil to atomize it, and the water mist generator is a fixed water supply device. And a water ultrasonic device for receiving water from the quantitative water supply device and applying ultrasonic waves to the water for atomization. The mixing device has a mixing chamber in which an oil mist air supply pipe that conveys the oil mist from the oil mist generator in the air flow and a water mist air supply pipe that conveys the water mist in the air flow from the water mist generator are connected. is doing. By the injection into the mixing chamber from both air supply pipes, the oil mist and the water mist are mixed in the mixing chamber, and the oil mist adheres to the surface of the water mist to form an oil film. It is connected and ejects an oil film-attached water mist from the nozzle.

In the present invention, each of the oil ultrasonic device and the water ultrasonic device has a liquid retaining member capable of impregnating and holding a liquid, and a support for supporting the liquid retaining member. A part of which forms a plate portion in contact with the liquid retaining member, and a large number of micropores having a predetermined diameter are formed in the plate portion, and the support receives ultrasonic waves from the ultrasonic wave generator. You can At that time, the plate portion may vibrate ultrasonically. The diameter of the fine holes determines the particle diameters of the desired oil mist and water mist, and is therefore determined corresponding to the particle diameter.

It is desired that the oil mist attached to the oil film bring about an optimum lubricating and cooling effect with a minimum amount, and for that purpose, it is necessary to adjust and set the injection amount to an optimum value and to keep it constant, which is a constant amount. Each of the oil supply device and the quantitative water supply device includes a storage tank capable of replenishing water and oil from the outside, an air supply pipe for supplying pressurized air to the storage tank, a delivery pipe for supplying water and oil from the storage tank, It is preferable to have a flow rate adjusting valve provided in the delivery pipe so that each of water and oil can be supplied from the delivery pipe in a fixed amount continuously or intermittently.

In the present invention, in order to more accurately concentrate and inject the water mist attached to the oil film even if the lubrication cooling part is located at a distant position, the nozzle device has the inner and outer nozzles forming the double ejection port, and It is preferable that the nozzle communicates with the mixing chamber and that the other nozzle is connected to a pressurized air inlet pipe.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

The lubrication cooling device of the first embodiment shown in FIG. 1 has an oil mist generator 10 and a water mist generator 20. The oil mist generator 10 has a fixed oil supply device 11 and an oil mist ultrasonic device 12, and similarly, the water mist generator 20 has a fixing water supply device 21 and a water ultrasonic device 22.

The fixed amount oil supply device 11 and the fixed amount water supply device 21 are respectively branched and connected from an air supply pipe 9 connected to a pressure supply source (not shown).
4, 24, air supply pipes 13, 23, storage tanks 15, 25,
The flow rate adjusting valves 16 and 26 are connected and configured.
The air pressure controllers 14 and 24 are storage tanks 15 and 25, respectively.
It gives a constant pressure, which is always appropriate, to the oil and water inside by using controlled air pressure. Storage tank 15,
25 has a capacity for storing a predetermined amount of oil and water, respectively, and is closed to the outside except communicating with the air supply pipes 13 and 23, but can supply oil and water regularly. Has become. And the flow control valve 1
Nos. 6 and 26 can adjust the flow rates of oil and water, respectively, but can also be shut off.

The oil ultrasonic device 12 and the water ultrasonic device 22 are
Ultrasonic oscillators 17 and 27 and supports 18 and 28, respectively
And liquid retaining members 19 and 29. The ultrasonic oscillators 17 and 27 can oscillate at a frequency in the range of 70 k to 2000 kHz, for example, and excite the vibrators 18A and 28A forming a part of the supports 18 and 28. The supports 18 and 28 form a space for accommodating the liquid retaining members 19 and 29 having a liquid retaining ability, such as a cotton-like body, a cloth-like body, and Styrofoam, and to the liquid retaining members 19 and 29. And has plate portions 18B and 28B which are lightly contacted from above. In the present embodiment, the plate portion 18B of the oil ultrasonic device 12 has a hole diameter of 1
A large number of pores of up to 5 μm are formed so as to penetrate, and a large number of pores having a hole diameter of about 100 μm are formed through the plate portion 28B of the water ultrasonic device 22.

Each of the flow rate adjusting valves 16 and 26 of the fixed quantity oil supply device 11 and the fixed quantity water supply device 21 has a downstream end outlet which holds the liquid retaining member 19 of the oil ultrasonic device 12 and the water ultrasonic device 22. It faces the liquid member 29, and the liquid holding members 19 and 29 are impregnated with a constant flow rate of oil and water, respectively.

The support 18 and the liquid retaining member 19 of the oil ultrasonic device 12 and the support 28 and the liquid retaining member 29 of the water ultrasonic device 22 are respectively the oil mist air supply pipe 3 through which pressurized air flows.
1 and is arranged in the water mist air supply pipe 32.

The oil mist air supply pipe 31 and the water mist air supply pipe 32
Is connected to a mixing chamber 33 of the mixing device 30,
The downstream end is open in the mixing chamber 33. Mixing chamber 3 above
3 is connected to the nozzle device 40 by a pipe 34.

The nozzle device 40 forms a double jet having an inner nozzle 41 and an outer nozzle 42, and both nozzles 41,
42 is arranged concentrically and is positioned so that the jet flows from both nozzles 41, 42 concentrically join at the outlet. The inner nozzle 41 has a pipe 3 from the mixing chamber 33.
4 is connected to the outer nozzle 42, and an air supply pipe 43 connected to a pressure air supply source is connected to the outer nozzle 42. The inner nozzle 41
Further, in the outer nozzle 42, the pipe 34 and the air supply pipe 43 are connected with a tangential component to the nozzle so that the internal flow is a straight flow or a swirl flow, or a spiral surface is provided on the inner surface. It is preferable to set.

In the apparatus of the present embodiment, the oil film-attached water mist for lubricating and cooling is generated as follows.

The storage tanks 15 and 25 are replenished so that, for example, sufficient oil and water are stored for the daily usage amount, respectively. The air pressure controllers 14 and 24 and the flow rate adjusting valves 16 and 26 are adjusted in their opening degrees so that the flow rates of oil and water per unit time correspond to predetermined lubricating and cooling conditions, respectively.

Air from the pressurized air supply source flows through the air supply pipes 13 and 23 and pressurizes the oil and water in the storage tanks 15 and 25.

The oil and water delivered from the storage tanks 15 and 25 due to the pressurization in the storage tanks are brought to the liquid retaining members 19 and 29 of the oil ultrasonic device 12 and the water ultrasonic device 22, where they are impregnated and held. It

The plate portions 18B and 28B vibrate by ultrasonic vibrations from the vibrators 18A and 28A of the supports 18 and 28 that support the plate portions 18B and 28B. On the other hand, the plate portions 18B, 28B
Is in contact with the liquid retaining members 19 and 29. The plate portion 18
B and 28B are provided with innumerable pores, and the plate portion 1
When 8B and 28B vibrate, the liquid on the liquid retaining members 19 and 29 is atomized through the pores of the plate portions 18B and 28B.
The particle diameters of the oil mist and water mist generated in the plate portions 18B and 28B are substantially equal to the hole diameters of the pores, and there is almost no variation in the particle diameter. That is, the particle size of the oil mist is a set value within the range of 1 to 5 μm, and the particle size of the water mist is about 100 μm.

The oil mist and water mist are mixed by a oil mist air supply pipe 31 and a water mist air supply pipe 32, respectively, into a mixing chamber 33.
Is transported to and mixed here. The oil mist is mixed with the water mist and adheres to the surface of the water mist to form an oil film. An oil mist having a particle size of 1 to 5 μm forms a film thickness of about 0.1 μm on the surface of a water mist having a diameter of about 100 μm when forming an oil film. Thus, an oil film-attached water mist is obtained.

The oil film-attached water mist is ejected from the inner nozzle 41 of the nozzle device 40. This jet flow is generated by the inner nozzle 4 under the Coanda effect.
A sharp and narrow beam is formed along the inner wall surface of No. 1 and is maintained as it is to reach a predetermined distant site. In the present embodiment, the oil film itself is extremely thin, but since the water mist has a relatively large mass, its effect is great. At this time, the air flow ejected from the outer nozzle 42 escorts the air flow ejected from the inner nozzle 41 from the air resistance to promote the above effect. If the jet flow from both nozzles 41, 42 is a swirl flow, the effect is further improved.

In the apparatus of this embodiment, the air flow is pressurized to 0.2
When supplied at a pressure of 0.5 MPa and a flow rate of 50 to 150 NL / min, the generated oil film attached water mist injects a distance of 100 mm or more from the tip of the inner nozzle 41 due to the Coanda effect. Further, the diameter of the flux of the water mist attached to the oil film is converged within 5 mm if the nozzle is of the optimum outflow type.

In the conventional atomization method using compressed air, the oil mist particle size is 30 to 600 μm.
And the water mist particle system vary in the range of 100 to 700 μm, respectively, but in the atomization method by the ultrasonic wave of the present invention, the atomized particle size is almost uniform and hardly fluctuates.

In this embodiment, the water mist particle size used is 1
When it is set to 00 μm, the oil mist particle diameter is a diameter arbitrarily set in the range of 1 to 5 μm depending on the processing conditions of the cut product.
Comparing the amounts of liquid used in both systems under the same turning conditions, the conventional atomization system using compressed air has 10 liters of water and 0.
When the usage amount is 1 liter, the atomization system of the present invention using ultrasonic waves has 8 liters of water and 0.08 liters of oil, and the efficiency is improved as the variation in particle size is small.

In the present invention, the diameter of the pores of the plate portion, that is, the diameter of the oil mist is set to 1 to 5 μm, but this is a preferred example, and 0.8 to 10 μm can also be used. For water, the diameter of the pores, that is, the diameter of the water mist is about 100μ.
m, but this is also a preferable example and is 80 to 120 μm.
m, further 30 to 600 μm can be used.

In this embodiment, the ultrasonic transducer is 7k.
Although it was decided to vibrate at a frequency of up to 2000 kHz, it is preferable to change this depending on the viscosity condition of water and oil, and it is set to the low frequency side for high viscosity and the high frequency side for low viscosity. Therefore, since oil and water have higher viscosities, oil and water are set in a low frequency range.

The present invention is not limited to the form shown in FIG. 1 and can be modified. For example, as shown in FIG. 2, the mixing device 30 can be integrated with the nozzle device 40. In FIG. 2, the inner nozzle 41
The upstream side of the chamber is extended with a large diameter, and this is the mixing chamber 3
3 and functions in the mixing chamber 33 as a support 18 for the oil ultrasonic device and a liquid retaining member 19 as a support 28 for the water ultrasonic device.
And the liquid retaining member 29 is located and exposed to the pressurized air flow flowing in the inner nozzle 41. In addition, in FIG.
The same parts as those in FIG.

[0035]

As described above, according to the present invention, the oil and water that are supplied in a fixed amount are atomized by ultrasonic waves, and the oil mist and the water mist are mixed by the mixing device, so that the oil mist adheres to the surface of the water mist. Since the oil film is formed by making the oil mist and water mist finer, the dispersion of the particle size can be made extremely small. As a result, the lubricant is accurately and intensively injected to the lubrication-cooled portion of the injection target, and the amount of oil consumed is reduced as the oil film becomes thinner. Thus, not only the lubrication cooling effect is improved, but also economically excellent, the surroundings are not polluted with oil, and the environment is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an apparatus according to another embodiment of the present invention.

[Explanation of symbols]

9 Air supply pipe 10 Oil mist generator 11 quantitative oil supply device 12 Oil ultrasonic device 14 Air controller 15 storage tanks 16 Regulator 18 Support 18B board 19 Liquid retaining member 20 Water fog generator 21 quantitative water supply device 22 Water ultrasonic device 24 Air controller 25 storage tanks 26 Regulator 28 Support 28B Board 29 Liquid retaining member 30 mixing equipment 31 Oil mist air pipe 32 Water mist air pipe 33 mixing chamber 40 nozzle device 41 inner nozzle 42 Outer nozzle

Claims (4)

[Claims] 1. An oil mist generator and a water mist generator, a mixing device for mixing the generated oil mist and the water mist to form an oil film on the surface of the water mist, and a nozzle device for ejecting the water mist attached with the oil film. In the lubrication cooling device, the oil mist generating device has a fixed oil supply device and an oil ultrasonic device for receiving oil from the fixed oil supply device and applying ultrasonic waves to the oil to atomize the oil. The generator has a quantitative water supply device and a water ultrasonic device that receives water from the quantitative water supply device and applies ultrasonic waves to the water to atomize it, and the mixing device is an oil mist from the oil mist generator. Has a mixing chamber to which an oil mist air supply pipe for conveying air mist and a water mist air supply pipe for conveying water mist from the water mist generator by air flow are connected, and from the both air supply pipes to the mixing chamber By the injection, the oil mist and the water mist are mixed in the mixing chamber, and the oil mist adheres to the water mist surface to form an oil film, A lubrication cooling device characterized in that the mixing chamber is connected to a nozzle device and an oil film-adhered water mist is ejected from the nozzle. 2. Each of the oil ultrasonic device and the water ultrasonic device has a liquid retaining member capable of impregnating and holding a liquid, and a support for supporting the liquid retaining member, and a part of the support. Is a plate portion in contact with the liquid retaining member, and a large number of micropores having a predetermined diameter are formed in the plate portion, and the support is adapted to receive ultrasonic waves from an ultrasonic wave generator. The lubrication cooling device according to claim 1. 3. The constant quantity oil supply device and the constant quantity water supply device respectively include a storage tank capable of replenishing water and oil from the outside, an air supply pipe for sending pressurized air to the storage tank, and water and oil delivery from the storage tank. 2. The lubrication cooling device according to claim 1, further comprising a delivery pipe for controlling the flow rate, and a flow rate adjusting valve provided in the delivery pipe, capable of continuously or intermittently supplying a fixed amount of water and oil respectively from the delivery pipe. . 4. The nozzle device is characterized in that the inner and outer nozzles form a double jet, one nozzle communicates with the mixing chamber, and the other nozzle is connected to a pressurized air inlet pipe. The lubrication cooling device according to 1.