JP6027598B2 - Mist generator - Google Patents

Description

  The present invention relates to a mist generating device that generates mist for cooling and lubricating a tool or a workpiece in cutting and grinding by a machine tool such as a lathe or a milling machine.

  In machine tools such as machining centers, the so-called MQL (Minimal Quantity Lubrication) system is widely used to supply a small amount of misted lubricating oil to the processing point for the purpose of reducing environmental impact and cutting fluid usage. . In this MQL method, liquid fine particles sprayed from a two-fluid nozzle using compressed air adhere to a mist supply line (for example, the inner wall of a spindle on which centrifugal force acts) and reach the processing point. It may become difficult to achieve desired cooling and lubrication.

  Therefore, a mist generating device is known in which uniform small particles are selected from a mist mixed with large and small liquid fine particles ejected from a two-fluid nozzle, and then a mist composed only of the small particles is supplied to a machine tool. (See Patent Document 1).

Japanese Patent No. 3320018

  In recent years, attempts have been made to apply cutting / grinding using oil mist to large parts and difficult-to-cut materials (for example, titanium and Inconel) that require a larger amount of cutting fluid than the MQL method. Yes. However, the conventional mist generating device generates liquid fine particles having a relatively small particle size (for example, an average particle size of about 1 to 3 μm) and has a relatively small supply amount (for example, a maximum supply amount of 20 to 50 ml / spraying at a rate of about hr), there is a problem that cooling and lubrication necessary for processing difficult-to-cut materials cannot be achieved.

  The present invention has been devised in view of such problems of the prior art, and an object of the present invention is to provide a mist generating apparatus capable of increasing the amount of cutting fluid supplied.

  According to the 1st side of this invention made | formed in order to solve the said subject, the nozzle (3) which mixes cutting fluid and gas and produces | generates mist, The mist which accommodates the mist sprayed from the said nozzle A container (4) and a mist supply line (6) for supplying the mist in the mist container toward the machine tool (2), the mist supply line externally supplying the mist in the mist container A mist take-in pipe (51) for discharging the mist into the pipe, and a mist take-in port (55) for introducing the mist into the pipe defines a spray pattern of the nozzle ( X).

  According to a second aspect of the present invention, there is provided an impact plate (14) that faces the nozzle in the mist container and abuts against the mist sprayed from the nozzle. Further, the mist intake port is disposed between the nozzle and the abutting plate.

  Moreover, according to the 3rd side surface of this invention, regarding the said 1st or 2nd side surface, the said mist intake opening opens in the direction which cross | intersects with the spraying direction (C) of the said nozzle. And

  According to a fourth aspect of the present invention, with respect to any one of the first to third aspects, the nozzle sprays the mist in a vertical direction, and the mist intake pipe is the mist container. A vertical portion (51a) extending in the vertical direction and a horizontal portion (51b) extending horizontally from the lower end of the vertical portion, and the mist inlet is formed at one end of the horizontal portion. Features.

According to the first aspect of the present invention, since the mist intake port is disposed in the spray region of the nozzle, in addition to the relatively small liquid particles staying in the mist container, the relatively large liquid particles immediately after spraying. Can be supplied to the machine tool, and the supply amount of the cutting fluid can be increased.
Further, according to the second aspect of the present invention, the liquid fine particles having a particle size that is liable to be liquefied in the mist supply line can be eliminated by the impact plate.
Further, according to the third aspect of the present invention, liquefaction of liquid fine particles around the mist intake port of the mist supply line can be prevented.
Further, according to the fourth aspect of the present invention, even when the liquid fine particles are liquefied around the mist intake port of the mist supply line, the cutting fluid generated by the liquefaction is supplied to the machine tool. Can be prevented.

It is a block diagram of the mist production | generation apparatus connected to the machine tool which concerns on embodiment. It is a schematic diagram which shows the detailed structure of the mist container in FIG.

  Hereinafter, a mist generating apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a mist generating device 1 supplies a cutting fluid (hereinafter simply referred to as mist) to a machine tool 2 such as a lathe or a milling machine, such as a water-soluble cutting oil. A nozzle 3 that generates a mist by mixing a cutting fluid containing gas and gas (here, compressed air), a mist container 4 that stores mist sprayed from the nozzle 3, and compressed air to the nozzle 3. The air supply line 5 for supplying and the mist supply line 6 for supplying the mist in the mist container 4 toward the machine tool 2 are mainly provided.

  As shown in FIG. 2, the mist container 4 has a cylindrical peripheral wall 11, and disk-shaped upper and lower walls 12 and 13 that close the upper and lower openings of the peripheral wall 11. A nozzle 3 is attached to the bottom surface of the upper wall 12, and mist is jetted downward from the nozzle 3. Further, the internal space of the mist container 4 is partitioned up and down by a disk-like impact plate 14 suspended from the upper wall 12, and the mist accommodation in which the mist is accommodated above the impact plate 14. A portion 15 and a cutting fluid storage portion 16 in which cutting fluid L (including liquefied mist) is stored are defined below the abutting plate 14.

  The nozzle 3 is composed of a siphon type well-known two-fluid nozzle, and communicates with an air introduction path 21 extending in the vertical direction to which the air supply line 5 is connected and an intermediate portion in the vertical direction of the air introduction path 21 in the horizontal direction. And a liquid introduction path 22 extending in the direction. An upper end of a cutting fluid supply pipe 23 that extends upward from the cutting fluid L of the cutting fluid storage portion 16 is connected to a site that defines the fluid introduction path 22. With such a configuration, when the compressed air is introduced into the air introduction path 21, the nozzle 3 causes the pressure difference generated between the communication part of the liquid introduction path 22 and the cutting fluid accommodation part 16 to move from the cutting fluid accommodation part 16. The cutting fluid L is sucked up through the cutting fluid supply pipe 23 and mixed with air inside the nozzle.

  As shown in FIG. 1, the air supply line 5 includes a first compressed air pipe 32 that guides compressed air from the air pressure source 31 to the air introduction path of the nozzle 3, and an upper wall after branching from the first compressed air pipe 32. 12 and the second compressed air pipe 34 that communicates with the internal space of the mist container 4.

  The first compressed air pipe 32 is provided with a variable throttle valve 42 that adjusts the flow rate of the compressed air. Further, in the second compressed air pipe 34 branched from the first compressed air pipe 32, the pressure in the mist container 4 (that is, the pressure of mist injected from an oil hole drill 54 described later) is adjusted to a predetermined pressure. A pressure reducing valve 47 is provided.

  The mist supply line 6 mainly includes a mist intake pipe 51 arranged inside the mist container 4 and a mist introduction pipe 52 that is connected to the downstream side of the mist intake pipe 51 and introduces the mist into the machine tool 2. Composed. The mist introduction pipe 52 is connected to a mist passage 53 in the machine tool 2, so that mist is applied to the workpiece W from the spray hole 54 a of the oil hole drill (tool) 54 located at the most downstream side of the mist passage 53. Sprayed.

  As shown in FIG. 2, the mist intake pipe 51 is an L-shaped pipe having a vertical portion 51a extending downward from the upper wall 12 of the mist container 4 and a horizontal portion 51b connected to the lower end of the vertical portion 51a. It is. The mist in the mist container 4 is introduced into the mist supply line 6 from a mist intake port 55 opened at one end of the horizontal portion 51b. The mist intake 55 is disposed between the nozzle 3 and the abutting plate 14 and opens in a direction intersecting (here, orthogonal) to the spray central axis (spray direction) C of the nozzle 3. Further, the mist inlet 55 is disposed in a conical spray region (region inside the two-dot chain line in FIG. 2) that defines the spray pattern of the nozzle 3.

  Next, the operation of the mist generating apparatus 1 having the above configuration will be described.

  When machining the workpiece W in the machine tool 2, compressed air is introduced from the air pressure source 31 into the air supply line 5. The compressed air is introduced into the air introduction path 21 of the nozzle 3 through the first compressed air pipe 32. As a result, the cutting fluid L in the cutting fluid reservoir 16 is introduced into the fluid introduction path 22 of the nozzle 3 through the cutting fluid supply pipe 23. Then, the cutting fluid and air are mixed in the nozzle 3, and the generated mist is ejected from the nozzle hole 60 of the nozzle 3. The cutting fluid L is continuously supplied to the nozzle 3 by a siphon action.

  Since the mist intake port 55 of the mist intake pipe 51 is disposed in the spray region X of the nozzle 3, relatively large liquid fine particles immediately after being sprayed from the nozzle 3 (for example, a particle size of about 10 to 20 μm). A part of the mist including is pushed out by the pressure in the mist container 4 and guided into the mist intake pipe 51 before reaching the abutting plate 14. On the other hand, particles having a relatively large particle size in the mist that have reached the impact plate 14 are liquefied by impacting the impact plate 14 and are returned to the cutting fluid containing portion 16. Further, relatively small liquid fine particles (for example, a particle diameter of about 1 to 3 μm) staying in the mist accommodating portion 15 without being liquefied by the impact plate 14 together with relatively large liquid fine particles immediately after being sprayed from the nozzle 3. The mist intake 55 is introduced into the mist intake pipe 51. The mist introduced into the mist take-in pipe 51 is introduced into the machine tool 2 through the mist introduction pipe 52 and sprayed from the tip of the oil hole drill 54 to the processing point of the workpiece W.

  The structure of the mist intake pipe 51 can be variously modified. For example, as shown by a two-dot chain line in FIG. 2, a mist intake port 55 ′ can be provided at the lower end of the vertical portion 51a. However, also in this case, the mist inlet 55 ′ needs to be arranged in the spray region of the nozzle 3.

  Thus, since the mist generating device 1 has the mist intake port 55 at the end of the mist supply line 6 disposed in the spray region X of the nozzle 3, the mist generating device 1 has a simple configuration similar to the device used in the conventional MQL method. In addition to the relatively small liquid fine particles staying in the mist container 4, relatively large liquid fine particles immediately after spraying can be supplied to the machine tool 2, and as a result, the amount of cutting fluid supplied is increased. It becomes possible.

  In the mist generating device 1, since the mist inlet 55 of the mist supply line 6 is disposed between the nozzle 3 and the abutting plate 14, liquid fine particles having a particle diameter that is easy to be liquefied in the mist supply line 6. It can be eliminated by the impact plate 14. In particular, since the mist inlet 55 of the mist supply line 6 opens in a direction orthogonal to the spraying direction of the nozzle 3, liquid liquefaction around the mist inlet 55 of the mist supply line 6 is prevented. Can do. Furthermore, since the mist intake pipe 51 has a configuration including a vertical portion 51a and a horizontal portion 51b connected to the lower end of the vertical portion 51a, liquid fine particles are liquefied around the mist intake 55 of the mist supply line 6. However, the cutting fluid generated by the liquefaction can be prevented from being supplied toward the machine tool 2.

  Although the present invention has been described in detail based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the mist intake pipe does not need to be disposed entirely in the mist container, and at least a part of the mist intake pipe having the mist suction port may be disposed in the mist container. The number and arrangement of nozzles that generate mist can be changed as appropriate. The mist intake port may be arranged in all nozzle spray regions regardless of the number of nozzles. Furthermore, the mist supplied to the machine tool can be sprayed toward the processing point from any discharge hole, not limited to the spray hole of the oil hole drill described above. All the constituent elements of the mist generating apparatus according to the present invention shown in the above embodiment are not necessarily essential, and can be selectively used at least as long as they do not depart from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Mist generator 2 Machine tool 3 Nozzle 4 Mist container 5 Air supply line 6 Mist supply line 14 Impact plate 51 Mist intake pipe 52 Mist introduction pipe 53 Mist passage 54 Oil hole drill 55 Mist intake C Spray center axis (Spray direction)
X Spray area

Claims (4)

A nozzle that mixes cutting fluid and gas to generate mist;
A mist container for containing mist sprayed from the nozzle;
A mist supply line for supplying the mist in the mist container toward the machine tool,
In the lower part of the internal space of the mist container, the liquefied mist is stored,
The mist supply line has a mist intake pipe for discharging the mist in the mist container to the outside, and the mist intake pipe penetrates an upper wall of the mist container that defines the internal space. A mist generating device , which extends downward and has a mist intake port for introducing the mist into the tube in a spray region of the nozzle. In the mist container, the mist container is further opposed to the nozzle, and further includes a striking plate against which the mist sprayed from the nozzle strikes.
The mist generating device according to claim 1, wherein the mist intake port is disposed between the nozzle and the abutting plate.   The mist generating device according to claim 1, wherein the mist intake port opens in a direction intersecting with a spraying direction of the nozzle. The nozzle sprays the mist vertically.
The mist intake pipe has a vertical portion extending in the vertical direction in the mist container, and a horizontal portion extending horizontally from the lower end of the vertical portion,
The mist generating apparatus according to any one of claims 1 to 3, wherein the mist intake port is formed at one end of the horizontal portion.

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