JP2002224934A - Working liquid supply device and machine tool with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working liquid supply device which permits the liquid to be cleaned up to a level ensuring a long time operation, and a machine tool with the working liquid supply device. SOLUTION: The working liquid supply device is provided with a working liquid reservoir tank 10 which includes a purifier tank 13 for cleaning up coolant, a purifying means 40 which makes the working liquid in the purifier tank 13 flown out and then returned, a delivery means 30 which pressurizes and discharges the purified working liquid, a supplying means 32 which feeds discharged to a machine tool, and a returning means 25 which returns the working liquid from the machine tool to the working liquid reservoir tank 10. The purifying means 40 is provided with a filtering means 42 which is composed of a first filter 46 and a second filter 48 located apart each other, and a coagulant auxiliary 47 which is filled between the first filter 46 and the second filter 48. The flow rate of the working liquid per minute flown out by the purifying means 40 will be not less than 1.5 times and not more than 2.0 times the flow rate of the working liquid per a minute discharged from the delivery means 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining fluid supply device for supplying machining fluid used in machining, and a machine tool provided with the machining fluid supply device.

[0002]

2. Description of the Related Art Generally, in the field of machining using a machine tool, the tool life is reduced by cooling a tool edge or lubricating a contact portion between a tool and a work or a contact portion between a grindstone and a work. The working fluid is supplied in order to increase the length of the workpiece and improve the finished surface of the work.

A working fluid supply device for supplying such a working fluid is generally provided with a storage tank for storing the working fluid, a pump for pressurizing and discharging the working fluid stored in the storage tank, and a working machine discharged from the pump. Supply means for guiding the liquid into the processing area of the machine tool, reflux means for returning the processing liquid supplied to the processing area to the storage tank, and the processing liquid discharged from the pump is supplied to the processing tool by the supply means. It is supplied into the processing area, and after that, it is returned to the storage tank by the reflux means,
It is to be collected.

Incidentally, lubricating oil is supplied to each sliding portion of the machine tool for the purpose of reducing sliding resistance. The lubricating oil is not collected again by the supply source, but is supplied unidirectionally from the supply source to each sliding portion, and exudes from each sliding portion. On the other hand, the processing liquid supplied into the processing area thereafter collides with a work or the like, and is scattered to each part in the processing area. Thus, when the working fluid scatters on the sliding portion, the lubricating oil seeping out of the sliding portion is mixed into the working fluid, and the working fluid is collected in the storage tank while the lubricating oil remains mixed. Become.

When the working fluid is a solution obtained by dissolving a water-soluble oil in water, if the working fluid mixed with the lubricating oil is used for a long time, the lubricating oil becomes a source of bacteria and the working fluid becomes It causes environmental problems such as spoilage and bad odor. In addition, the above-described effect as a working fluid is weakened.

In addition, since the machining fluid refluxed to the reservoir contains fine particles such as chips, metal powder, carbon, and abrasive grains generated by machining, if the machining fluid is repeatedly used for a long period of time, it becomes extremely polluted, and the work fluid becomes extremely dirty. And the inside of tools and machine tools are contaminated. In addition, the effect as a working fluid is weakened.

[0007] Therefore, it is necessary to remove the contaminants such as the lubricating oil and chips from the machining fluid. Conventionally, chips have been removed using a sedimentation method or a filter.
The lubricating oil was removed using an oil separator.

As the oil separator, a disk-shaped rotating body or a rotating belt is immersed in a working fluid, and lubricating oil floating on the working fluid is attached to the rotating body or the belt, and the attached lubricant An example in which oil is scraped off with a scraper or the like can be exemplified.

[0009]

However, in the above-described conventional chip removing method and lubricating oil removing method, the machining fluid is purified by removing chips and lubricating oil to such an extent that they can withstand long-term use. I couldn't.

That is, in the above-described precipitation method, relatively large chips can be removed, but fine particles such as carbon and abrasive particles cannot be removed. Even if used to remove it, the filter was clogged and inefficient. Also, as for the lubricating oil, those which have become fine particles emulsified cannot be removed by the oil separator.

The present invention has been made in view of the above circumstances, and provides a machining fluid supply device capable of purifying a machining fluid to such an extent that it can be used for a long time, and a machine tool provided with the same. With the goal.

[0012]

Means for Solving the Problems and Effects There is provided an invention according to claim 1 of the present invention for achieving the above object, which is a tank for storing a working fluid for purifying the stored working fluid. A processing fluid storage tank configured to include at least a purification processing tank, and a purifying unit configured to cause the processing fluid stored in the purification processing tank to flow out of the purification processing tank for purification, and then return to the purification processing tank, Discharge means for pressurizing and discharging the processing fluid purified by the purification means, supply means for supplying the processing fluid discharged from the discharge means to the machine tool,
A machining fluid supply device having a recirculation means for recirculating the machining fluid supplied to the machine tool to the machining fluid storage tank,
The purifying means includes a filtering means comprising a first filtering body and a second filtering body arranged side by side at an interval, and a coagulation aid filled between the first filtering body and the second filtering body. The processing fluid flowing out of the purification treatment tank is configured to be purified by passing through the filtration means, and the flow rate of the processing fluid discharged by the purification means per minute is reduced. A machining fluid supply device characterized in that the machining fluid is discharged from the discharge means at a rate of 1.5 times to 2.0 times a flow rate per minute.

According to the working fluid supply device of the present invention, the working fluid is supplied from the storage tank to the machine tool by the discharge means and the supply means, and the supplied working fluid is returned to the storage tank again by the reflux means. Further, the processing liquid stored in the purification processing tank constituting the storage tank is purified by the purification means and then returned to the purification processing tank again. Therefore, the polluted working fluid refluxed and recovered from the machine tool is purified in the purification tank via the purifying means, and the purified working fluid is supplied to the machine tool by the supply means. As a result, a clean working fluid is always supplied to the machine tool.

By the way, as described above, the machining fluid refluxed and recovered from the machine tool contains chips, fine particles such as metal powder, carbon, abrasive grains and lubricating oil accompanying the machining. According to the present invention, the processing liquid that is caused to flow out of the purification tank by the purification unit first passes through the first filter. At that time, relatively large particles (such as chips)
Is captured by the first filter. The lubricating oil may be mixed into the processing liquid as a relatively large lump, or may be mixed as emulsified fine particles. The large lump of oil floats on the working fluid due to its specific gravity, so that it can be easily removed, can be treated in the purification tank, and is preferably removed in the purification tank.

Next, particles (such as metal powder, carbon, fine particles such as abrasive grains, and emulsified oil) which cannot be captured by the first filter pass through the first filter to reach the coagulation aid, When passing through the particles, the particles are aggregated by the action to form a large lump of several hundred times, leading to the second filter. In the second filter, the solid particles such as metal powder, carbon, and abrasive grains are trapped in the aggregated particles, while the aggregated oil is deformed as a lump and passes through the second filter to be purified. It is returned to the treatment tank.
And the lump of oil that was recirculated to the purification tank is
It floats on the working fluid and is easily removed.

As described above, according to the present invention, fine particles are aggregated and removed, so that they can be easily removed and the working fluid can be highly purified. In addition, clogging of the filter is unlikely to occur.

The flow rate per minute of the working fluid discharged from the purifying means is 1.5 times or more and 2.0 times or less of the flow rate per minute of the working liquid discharged from the discharge means. Is preferred. If it is less than 1.5 times, the processing fluid in the purification tank cannot be sufficiently purified,
This is because the degree of purification does not change so much even if it is more than twice.

Preferably, the coagulation aid contains at least basic magnesium sulfate and magnesium hydroxide as in the second aspect of the present invention.

The machine tool provided with the working fluid supply device according to claim 1 or 2 can maintain a good working state for a long time.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view schematically showing a working fluid supply device according to the present embodiment, FIG. 2 is a cross-sectional view taken along a line II in FIG. 1, and FIG. It is sectional drawing of the arrow II-II direction.

As shown in FIGS. 1 to 3, the working fluid supply device 1 of this embodiment sucks the working fluid in the storage tank 10 via a suction pipe 31 and a storage tank 10 for storing the working fluid. And a purifying device 40 for purifying the working fluid in the storage tank 10.

The storage tank 10 includes a tank body 11 and a tank body 11.
A partition plate 15, 16, 17, 18, 19, 20, 21 or the like for partitioning the inside into areas A, B, C, D, E, F, G, H, etc. 12 (areas A and B), a purification treatment layer 13 (areas C, D, E and F) and a cleaning tank 14 (areas G and H). Also,
Between the partition plate 15 and the bottom surface of the tank body 11, as well as the partition plate 1
6 and the upper edge of the tank main body 11, spaces are respectively formed between the partition plates 17, 18, 19 and 20 and the inner side surface of the tank main body 11, as shown in FIG. A space is formed.

Further, in the region A, a filtering member constituted by accommodating a large number of granules (3 to 10 mm in diameter) made of polypropylene in a cage having at least an upper and lower surface formed of a net or a porous body. 22 is immersed and arranged at an intermediate position in the depth direction. In addition, the tank body 11 includes:
A communication passage 24 communicating the region G and the region H is formed, and the communication passage 24 in the region G has a large number of polypropylenes in a cage whose at least upper and lower surfaces are formed of a mesh or a porous body. A filtering member 23 configured to accommodate a granular material (3 to 10 mm in diameter) is immersed and arranged.

The purifying device 40 has a pump 41, a filter 42, and one end connected to a region F of the tank body 11,
An outlet pipe 54 having the other end connected to the pump 41, a supply pipe 55 having one end connected to the pump 41, the other end connected to the filter 42, one end connected to the filter 42, and the other end having a tank. It comprises a reflux tube 56 connected to the region C of the main body 11 and the like.

The filter 42 includes a hollow and cylindrical container 43 and a filter 44 accommodated in the container 43.
The container 43 is provided with a support plate 50 at the lower part of the room.
And a spring 49 at the upper end of the room. Thus, the filter 44 housed in the container 43 is pressed against the support plate 50 by the spring 49 and is held between the spring 49 and the support plate 50.

The filter 44 has a hollow and cylindrical shape, a cover 45 having a large number of openings on the outer periphery, and a hollow and cylindrical first filter 46 housed in the cover 45. A second filter 48 having the same hollow and cylindrical shape, which is disposed in the first filter 46 at an appropriate distance from the first filter 46, and an agglomeration filled between the first filter 46 and the second filter 48. It consists of an auxiliary agent 47.

A supply pipe 51 penetrating therethrough is fixedly provided on the outer periphery of the container 43, and one end thereof is inserted into the second filter 48 through the support plate 50 at a lower end thereof. An outlet pipe 52 is fixedly provided. And the supply pipe 5
1 is connected to the supply pipe 55, and the outlet pipe 52 is connected to the reflux pipe 56.

The first filter 46 is made of, for example, 200 μm filter paper made of polypropylene, and the second filter 48 is made of, for example, a cylindrical cartridge filter made of 10 μm made of polypropylene.
Further, the coagulation aid 47 has magnesium as a main component, and preferably contains at least basic magnesium sulfate and magnesium hydroxide. In addition, coagulation aid 4
In order to increase the mutual gap of 7, for example, it is preferable to mix a spacer having a diameter of about 3 mm, which is made of a lightweight silicon earth, by about 50% by volume.

A supply pipe 32 connected to a machine tool (not shown) is connected to the pump 30, and a pollution tank 12 of the storage tank 10 is connected to a machine tool (not shown). The connected reflux tube 25 is connected. Also,
Area A, Area C, Area E, and Area G of the tank body 11
Each section is provided with an outlet 26.

According to the working fluid supply apparatus 1 of the present embodiment having the above-described structure, the working fluid is sucked out of the storage tank 10 through the suction pipe 31 by the pump 30, and after the working fluid is pressurized to a predetermined pressure. The discharged machining fluid is supplied through a supply pipe 32 into a machining area of a machine tool (not shown).
Then, the processing fluid supplied into the processing area is returned to the return pipe 25.
Refluxed into the storage tank 10 through the tank and collected. Further, the processing fluid in the purification tank 13 of the storage tank 10 is supplied to the purification device 40.
After being sucked out and purified by the purification tank 13 again
It is refluxed inside. Thus, the supply of the working fluid by the pump 30, the collection of the working fluid through the reflux pipe 25, and the purification of the working fluid by the purification device 40 are performed simultaneously and in parallel.

Hereinafter, a process for purifying the processing fluid in the storage tank 10 and the purifying device 40 will be described.

First, the working fluid refluxed through the reflux pipe 25 is collected in the area A of the pollution tank 12. As described above, the machining fluid refluxed and collected from the machine tool (not shown) contains chips and fine particles such as metal powder, carbon, and abrasive grains and lubricating oil accompanying the machining. Area A of the pollution tank 12
After passing through the filtering member 22, the processing fluid collected in the area B, the area C, the area D, the area E, the area F, the area G, and the area H
When the oil passes through the filtering member 22, the relatively large lumps of oil mixed with the working fluid come into contact with each other to form larger lumps and float on the surface of the liquid, and the outlet 2
Take out from 6. Further, relatively large chips are trapped by the filter member 22 when passing through the filter member 22, or large chips are allowed to pass through the pollution tank 12.
(Areas A and B) Settle and settle at the bottom.

As described above, the processing fluid from which relatively large chips and oil have been removed flows into the purification tank 13 and
The flow sequentially proceeds in the order of the regions C, D, E, and F. When the flow reaches the region F, the water is sucked out by the pump 41 through the outlet pipe 54,
It is sent to the filter 42 via the supply pipe 55. Filter 42
First, the working fluid introduced into the first filter 46 passes through the first filter 46, and at that time, the first filter 46 captures contaminants (such as chips) of relatively large particles among the remaining contaminants. .

Next, particles of a size not captured by the first filter 46 (fine particles such as metal powder, carbon and abrasive grains, emulsified oil, etc.) pass through the first filter 46 and become a coagulation aid 47. When passing through, the particles are aggregated by their action to form a large lump of several hundred times and reach the second filter 48. The second filter 48 captures solid particles such as metal powder, carbon, and abrasive grains among the aggregated particles,
The coagulated oil is deformed as a lump, passes through the second filter 48, and passes through the reflux pipe 56 to the purification treatment tank 13 (region C).
Is refluxed. Then, the lump of oil recirculated to the purification tank 13 floats on the liquid surface and is removed from the outlet 26.

Thus, the working fluid in the purification tank 13 is
It is purified by circulating between it and the purification device 40.

The working fluid flowing out of the cleaning tank 13 flows into the area G of the cleaning tank 14, passes through the filtering member 23, and then flows into the area H. When a large lump of oil remains in the working fluid, when it passes through the filtering member 23, it comes into contact with each other to form a larger lump, floats on the liquid surface, and is taken out from the outlet 26. Thus, a highly purified working fluid flows into the region H and is supplied to a machine tool (not shown) by the pump 30.

As described above, according to the cutting supply device 1 of the present embodiment, fine particles are aggregated and removed, so that they can be easily removed, and the machining fluid can be highly purified. Is possible. And a machine tool (not shown) provided with such a working fluid supply device 1 can maintain a good working state for a long time.

The flow rate per minute of the machining fluid discharged from the pump 41 of the purifying device 40 is the flow rate of the machining fluid discharged from the pump 30 per minute.
It is preferably 1.5 times or more and 2.0 times or less. 1.5
If it is less than twice, the working fluid in the purification tank 13 cannot be sufficiently purified, but if it is more than twice, the degree of purification does not change much.

As shown by the two-dot chain line in the example shown in FIG. 1, the lead-out pipe 54 may be connected to the region C, and the purification tank 13 may be the region C only.

As described above, one embodiment of the present invention has been described. However, specific aspects that can be taken by the present invention are not limited to this embodiment. For example, in the above example, the storage tank 10 is divided into the pollution tank 12, the purification tank 13, and the cleaning tank 1.
Although the storage tank 51 is divided into four tanks, as shown in FIG. 4, the storage tank 51 may be formed without dividing the inside of the tank and having only one purification treatment tank. Similarly, the processing liquid can be highly purified by the processing liquid supply device 50.

Further, as shown in FIG. 5, the storage tank 61 may be a combination of the contamination tank 12 in the processing liquid supply device 1 and the purification treatment tank shown in FIG. Similarly, the processing liquid can be highly purified by the processing liquid supply device 60.

As shown in FIG. 6, the storage tank 71 is composed of a pollution tank 72 and a purification tank 73, and the processing liquid in the pollution tank 72 is treated by the pretreatment device 74 and then supplied to the purification tank 73. You may do it. The pre-processing device 74
Pump 75, pretreatment filter 76, pump 75 and pollution tank 7
2, a pump 75 and a pretreatment filter 76
And a pipe 79 connecting the pretreatment filter 76 and the purification tank 73. Pretreatment filter 76
Has a relatively coarse filter and captures and removes relatively large chips. Similarly, the processing liquid can be highly purified by the processing liquid supply device 70. In this case, it is desirable to make the flow rate of the pump 75 larger than the flow rate of the pump 41.

In addition, the pollution tank 12 shown in FIGS.
A magnet or a paper filter may be provided in (72) or the purification tank 13 (73). Thus, the present invention can employ various modifications.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a working fluid supply device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a line II in FIG.

FIG. 3 is a sectional view taken along the line II-II in FIG.

FIG. 4 is a plan view schematically showing a working fluid supply device according to another embodiment of the present invention.

FIG. 5 is a plan view schematically showing a working fluid supply device according to another embodiment of the present invention.

FIG. 6 is a plan view schematically showing a working fluid supply device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing liquid supply apparatus 10 Storage tank 11 Tank main body 12 Pollution tank 13 Purification processing tank 14 Cleaning tank 22, 23 Filtration member 30 Pump 32 Supply pipe 25 Reflux pipe 40 Purification apparatus 41 Pump 42 Filter 46 First filter 47 Coagulation auxiliary agent 48 Second filter

Continuation of the front page (72) Inventor Kimihiko Okami 2-11-18 Toyoshin, Higashi-Yodogawa-ku, Osaka-shi, Osaka Hirakai Industrial Building 306 Liquid Conservation Co., Ltd. F term (reference) 3C011 EE08 EE09 4D015 BA03 BA19 CA06 DA19 DC04 EA02 EA06 EA33 EA35 4D064 AA23 BM22 BM28 BM34 BM37 4D066 AA02 AC08 BB02

Claims (3)

[Claims] A processing fluid storage tank configured to include at least a purification processing tank for purifying the stored processing fluid; and a processing fluid stored in the purification processing tank. After flowing out of the purification tank for purification, and then returning to the purification tank, discharge means for pressurizing and discharging the working fluid purified by the purification means, and processing discharged from the discharge means. A machining fluid supply device comprising: a supply unit that supplies a fluid to the machine tool; and a recirculation unit that recirculates the machining fluid supplied to the machine tool to the machining fluid storage tank. A filtering means comprising a first filter body and a second filter body provided and a coagulation aid filled between the first filter body and the second filter body. The flowing out working fluid is supplied to the filtration means. The cleaning fluid is configured to be purified by passing the cleaning fluid, and the flow rate of the processing fluid discharged by the cleaning means per minute is 1.5 times the flow rate of the processing fluid discharged from the discharge means per minute. A machining fluid supply device, wherein the machining fluid supply device is configured to be at least twice and at most 2.0 times. 2. The working fluid supply device according to claim 1, wherein the coagulation aid comprises at least basic magnesium sulfate and magnesium hydroxide. 3. A machine tool provided with the working fluid supply device according to claim 1.