JPH07328888A - Circulating reproducing device for metal work liquid - Google Patents

Abstract

PURPOSE:To enhance cleaning efficiency of a coolant by providing a chip removing means and another chip removing means to centrifuge and remove smaller chips by applying centrifugal force to metal work liquid which has passed through an operating fluid removing means. CONSTITUTION:From a used coolant, chips which are contained in the coolant and have the size not less than about 50mum are removed by a first chip removing means 1. Next, this coolant is made to flow in a floating oil removing means 7. The coolant made to flow in the floating oil removing means 7 is stored, and floating oil floating in the vicinity of a water surface of the stored coolant is separated and removed. Next, this coolant is made to flow in a second chip removing means 3, and for example, centrifugal force of 300 to 800G is applied. The chips which are contained in the coolant and have the size not less than about 5 to 10mum are separated and removed by this centrifugal force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid circulating and regenerating apparatus for metal working which can efficiently purify a coolant used in a metal working apparatus or the like.

[0002]

2. Description of the Related Art A metal working apparatus such as a cutting apparatus or a polishing apparatus uses a coolant, which is water mixed with a water-soluble cutting agent, for the purpose of infiltration, cooling, lubrication and corrosion protection. As the components of the water-soluble cutting agent, there are an emulsion type containing mineral oil and a surfactant as a main component, and a solution type containing a surfactant as a main component. When the metalworking device is operated, hydraulic fluid and particles generated by cutting or polishing are mixed in the coolant.
Therefore, in order to reuse the coolant, it is necessary to purify the coolant. Conventionally, as shown in FIG. 4, the coolant used in the metal working apparatus is first stored in an oil liquid tank, and then the coolant is purified by passing through a wire mesh filter, and the purified coolant is returned to the metal working apparatus again. Had returned. At this time, the coolant is stored in an oil liquid tank to precipitate cutting chips and the like, and the filtration residue is removed through a wire mesh filter to remove the cutting chips mixed in the coolant.

According to such a conventional coolant cleaning method, the used coolant has a particle size of 30-5.
It was possible to remove cutting dust of 0 μm. Further, conventionally, the time to replace the coolant has been determined based on, for example, scratches, malodors, stains or discoloration of the coolant produced in the product manufactured by cutting and polishing. At this time, for example, when the metal working apparatus was driven for 24 hours a day, it was an interval of 1 to 3 weeks.

[0004]

However, in the above-mentioned conventional purification method, fine cutting chips cannot be removed by the metal filter. This is because the size of the mesh of the wire netting filter is set to be large enough for the coolant to permeate therethrough, so that fine cutting dust penetrates the eyes of the wire netting filter. Further, even if a metal filter having a coarse enough to pass through the coolant is used, when the metal filter is clogged, an emulsion type liquid having a particle size of about 1 to 10 μm or a particle size of about 1 μm is used. The liquid to be circulated, such as the coolant liquid, cannot pass through the wire mesh filter and is accumulated in the oil liquid tank. Therefore, there is a problem that it is necessary to constantly monitor the wire mesh filter so as not to be clogged, which is troublesome.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a liquid circulating and regenerating apparatus for metal working capable of efficiently purifying the coolant used in the metal working apparatus.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the metal-processing liquid circulating and regenerating apparatus of the present invention is a device for recycling a used metal-processing liquid containing metal chips. A first chip removing means for removing chips having a size of 1 or more, and a metal working fluid that has passed through the first scrap removing means is stored, and the stored metal working fluid is near the water surface. A floating oil removing means for removing floating oil such as hydraulic oil leaked from the metal working apparatus floating in the air, and a centrifugal force is applied to the metal working fluid that has passed through the floating oil removing means to make the second smaller than the first size. A second chip removing means for removing chips having a size equal to or larger than the size by centrifugal separation.

In the liquid circulating and regenerating apparatus for metalworking of the present invention, preferably, the coolant used in each of the plurality of metalworking machines is sequentially introduced to perform purification.

Further, the liquid circulating and regenerating apparatus for metalworking of the present invention preferably introduces and purifies a coolant commonly used in a plurality of metalworking apparatuses.

[0009]

In the liquid circulating and recycling apparatus for metalworking according to the present invention, the used coolant flows from the metalworking machine into the first chip removing means. The used coolant contains chips produced by polishing and cutting, and floating oil such as hydraulic oil leaked from the metal working device. In the first chip removing means, the used coolant has chips larger than the first size contained in the coolant removed. Next, the coolant that has passed through the first chip removing means flows into the floating oil removing means. The coolant that has flowed into the floating oil removing means is stored, and the floating oil floating near the water surface of the stored coolant is separated and removed. Next, the coolant that has passed through the floating oil removing means flows into the second chip removing means, for example, 3
A centrifugal force of 00 to 800 G is applied. This centrifugal force separates and removes chips having a size equal to or larger than the second size contained in the coolant. At this time, the particle size of the chips to be separated and removed can be determined by adjusting the magnitude of the centrifugal force applied to the coolant.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A liquid circulating and recycling apparatus for metal working according to an embodiment of the present invention will be described below. FIG. 1 is a diagram for explaining a liquid circulating and recycling apparatus 100 for metalworking of this embodiment. As shown in FIG. 1, a liquid circulating and recycling device 10 for metal processing
0 is mainly the rough processing waste recovery machine 1, the dirty water receiving tank 5,
It has a dirty water pump 6, a floating oil collector 7, a dirty tank 2, a dirty water transfer pump 8, a centrifuge 3, a clean water receiving tank 9, a clean water pump 10, a clean tank 4 and a pump 11.

In the rough processing waste collecting machine 1, used coolant is flowed in from a metal processing apparatus for processing powder sintered products such as iron and aluminum through a pipe 20 provided with a valve 20a. The used coolant contains floating oil and chips produced by cutting and polishing. The rough processing waste collecting machine 1 is provided with a screen-shaped conveyor such as a woven net and a perforated plate, and the chips 24 contained in the used coolant are hooked by the second mesh and conveyed to the discharge port 21. Is discharged. At this time,
The grain size of the chips 24 hooked by the mesh is, for example, 50 μm or more.

The coolant, from which the chips 24 have been removed by the rough processing chip recovery machine 1, flows out through the pipes 22 and 23 and is stored in the dirty water receiving tank 5. The coolant stored in the dirty water receiving tank 5 is supplied by the pump force from the dirty water pump 6 to the pipe 25 provided with the valve 25a and the pipe 2 provided with the valve 26a.
It flows out via 6 and is stored in the dirty tank 2.

On the water surface of the coolant stored in the dirty tank 2, a gate float 7a of the floating oil collector 7 is floated. As described above, when the coolant is stored in the dirty tank 2, the floating oil has a specific gravity smaller than that of water, and thus the floating oil contained in the coolant floats near the surface of the coolant. Therefore, when the pump force from the pump 7b is transmitted to the gate float 7a floated on the water surface, the floating oil floating on the water surface of the coolant is pipe 29.
And is stored in the tank 7c. As a result, the floating oil contained in the coolant that easily decomposes and emits a foul odor is removed. At this time, the water stored in the tank 7c by the gate float 7a is, for example, an oil droplet diameter of about 3
It is a floating oil with a size of 0 μm or more. Therefore, the emulsified oil having an oil droplet diameter of 1 to 10 μm and the dispersed oil having an oil droplet diameter of 1 μm or less circulate through the pipe 27.

The coolant stored in the dirty tank 2 is discharged from the drain port provided near the bottom of the dirty tank 2 by the pump force from the dirty water transfer pump 8.
Pipe 27 and valve 28 provided with valve 27a
It flows out toward the centrifuge 3 through a pipe 28 provided with a.

In the centrifuge 3, the coolant from the dirty tank 2 flows in from the inflow port 3b and flows into the rotating body 3a which rotates about a predetermined axis. At this time, the rotating body 3a
A strong centrifugal force is continuously applied to the coolant flowing therein, and the fine particles contained in the coolant are forcibly precipitated, and a clean supernatant liquid is flown out to the clean water receiving tank 9 through the discharge port 3c. . In the rotator 3a, the precipitated fine particles are pressed into the rotator 3a, dehydrated, deoiled, solidified, and discharged to the sludge box 3e. The centrifugal force generated by the rotation of the rotating body 3a is, for example, about 500 G, and chips having a particle size of 5 to 10 μm or more can be separated and removed. The number of rotations of the rotating body 3a is determined according to the particle size of the cutting chips to be separated and removed, and it is usually preferable that a centrifugal force of 300 to 800 G is generated, whereby the specific gravity is about 2 Aluminum chips of 0.7 and iron and copper chips with a specific gravity of about 7 to 9 can be separated.

The coolant stored in the clean water receiving tank 9 is pumped by the clean water pump 10 through the pipe 30 provided with the valve 30a and the pipe 31 provided with the valve 31a. It is drained from 9 and stored in the clean tank 4.

In the coolant stored in the clean tank 4, chips having a particle size of about 50 μm or more are removed by the roughing debris recovery machine 1, and the oil droplet size of about 30 μm or more is obtained by the floating oil recovery device 7. The floating oil is removed, and the centrifuge 3 removes chips having a particle size of about 5 to 10 μm or more. Therefore, the particle size that could not be removed by the conventional method is 3
Chips of 0 to 50 μm or less can be removed, and the cleaning efficiency of the coolant can be improved.

Before the centrifugal separation by the centrifuge 3, the coarse chips are removed by the roughing debris collector 1, so that the coarse chips may be damaged by abrasion of the centrifuge 3. It can be avoided.

The purified coolant stored in the clean tank 4 is supplied again to the metal working apparatus via the pipe 32 by the pump force from the pump 11.

A system using the above-mentioned metal-processing liquid circulation / regeneration device 100 will be described below. In this system, the above-mentioned metal working liquid circulation regenerating apparatus 1 shown in FIG. 1 is used.
00 indicates the pipe 54 and the valve 5 as shown in FIG.
It is connected to the metal working devices 51a to 51f via 3a to 53f. The tanks 52a to 52f store the coolants used in the metal working devices 51a to 51f, respectively. In this system, the valves 53a to 53f
Are sequentially opened, and the tanks 52a to 52f of the metal working devices 51a to 51f are sequentially opened to the liquid circulating and recycling device 10 for metal working.
0 for cleaning the coolant stored in the tank connected in the liquid circulating and recycling apparatus for metal processing 100.

For example, when purifying the coolant stored in the tank 52a, the valves 53b to 53f are closed and only the valve 53a is opened. This allows the tank 52
The coolant stored in “a” flows out to the metal-processing liquid circulation / regeneration device 100 through the pipe 54 and is purified. Then, the purified coolant is supplied from the metal-processing liquid circulation / regeneration device 100 through the pipe 54 to the tank 52a.
Will be supplied again.

In this embodiment, the amount of water stored in the tanks 52a to 52f is the same, for example, 400 liters. Further, the metal-processing liquid circulation / regeneration device 100 cleans this 400 liters of coolant in about 4 minutes.

According to the system of the present embodiment, even when the system is driven for 24 hours a day, it is possible to replace the coolant at intervals of 3 to 5 months, and to reduce the load associated with maintenance of the apparatus. . Further, since the wire mesh filter is not used, the work for removing the clogging and performing backwashing becomes unnecessary. Further, according to the system of the present embodiment, it is possible to operate the metal working apparatus that does not use the coolant, which is being purified in the metal working liquid circulation regenerating apparatus 100, as it is, and all the metal working apparatuses can be used for purifying the coolant. No need to stop. Therefore, the productivity of the metal processing apparatus can be increased and the running cost can be reduced.

Another system using the metal-processing liquid circulation / regeneration device 100 will be described. In this system,
As shown in FIG. 3, a liquid circulating and recycling apparatus 100 for metal processing.
Is connected to the tank 57 via a pipe 58 provided with a valve 58a and a pipe 59 provided with a valve 59a. The tank 57 is connected to the metal processing devices 51a to 51f via pipes 55 and 56.

In this system, the metal working devices 51a-5
1f shares the tank 56 which stores a coolant.
The coolant flows from the tank 57 to the metal processing devices 51a to 51a.
The used coolant is supplied to the f through the pipe 55, and the used coolant is returned to the tank 57 from the metal working devices 51a to 51f through the pipe 56. In this system, when purifying the coolant, all of the metal working devices 51a to 51f are stopped, the valves 58a and 59a are opened, and the coolant stored in the tank 57 is used as the metal working liquid circulation regenerating device 10.
Wash with 0.

[0026]

EFFECTS OF THE INVENTION According to the liquid circulating and recycling apparatus for metalworking of the present invention, in addition to the chips having a particle size of 50 μm or more contained in the used coolant, fine chips having a particle size of 5 to 10 μm or more are removed. Therefore, the cleaning efficiency of the coolant can be improved. Further, according to the liquid circulating and recycling apparatus for metalworking of the present invention, after removing chips having a large particle size, centrifugation is performed using a centrifuge, so that the centrifuge may be damaged due to abrasion or the like. It can be avoided. Further, according to the liquid circulating and recycling apparatus for metalworking of the present invention, the time interval for replacing the coolant can be extended. As a result, it is possible to reduce the burden on the parties involved in the maintenance of the device. Further, according to the liquid circulating and recycling apparatus for metalworking of the present invention, by sequentially purifying the coolant used for each of the plurality of metalworking apparatuses, the metalworking apparatus that uses the unpurified coolant is stopped. You can continue to operate without. As a result, the running cost of the metal working device can be reduced. Further, according to the liquid circulating and recycling apparatus for metal processing of the present invention, the second
In the chip removing means, the particle size of the chips to be separated and removed can be determined by adjusting the magnitude of the centrifugal force applied to the coolant.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a metal-processing liquid circulation / regeneration device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a system using the metal-processing liquid circulation / regeneration device shown in FIG.

FIG. 3 is a diagram for explaining another system using the liquid circulating and regenerating apparatus for metalworking shown in FIG.

FIG. 4 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 1 ... Rough processing waste collector 2 ... Dirty tank 3 ... Centrifuge 4 ... Clean tank 5 ... Dirty water receiving tank 6 ... Dirty water transfer pump 7 ... Floating oil collector 7a ... Gate float 8 ... Dirty water transfer pump 9 ... Clean water receiving tank 10 ... Clean water pump 11 ... Pumps 51a to 51f ... Metal working equipment 52a to 52f, 57 ... Tank 100 ... Liquid circulating and recycling equipment for metal working

Claims (5)

[Claims] 1. A first chip removing means for removing chips having a size larger than or equal to a first size from a used metal working liquid containing metal chips, and the first chip removing means. The metal working fluid that has passed through the means is stored, and floating oil removing means that removes floating oil floating near the water surface of the stored metal working fluid, and centrifugal force is applied to the metal working fluid that has passed through the hydraulic oil removing means.
A second metal chip removing means for centrifugally removing chips having a size larger than a second size and smaller than the first size, and a liquid circulating and regenerating apparatus for metalworking. 2. The liquid circulating and recycling apparatus for metal working according to claim 1, further comprising a water storage means for storing the metal working fluid that has passed through the second chip removing means. 3. The liquid circulating and regenerating apparatus for metal working according to claim 1, wherein the second chip removing means applies a centrifugal force of 300 to 800 G to the metal working fluid. 4. A coolant used for each of a plurality of metal working apparatuses is sequentially introduced to purify the coolant.
The liquid circulating and recycling apparatus for metal processing according to any one of 1. 5. The liquid circulating and regenerating apparatus for metal processing according to claim 1, wherein a coolant commonly used in a plurality of metal processing apparatuses is introduced to purify the coolant.