JPH09104992A - Cleaning method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method and a device therefor for removing a dried or undried cutting oil from metallic products machined by using a water soluble cutting oil. SOLUTION: This cleaning device is provided with a cleaning vessel 1 provided with an ultrasonic vibrator, a reserve tank 2, an oil-water separator, a circulation pump 14 and a vacuum pump 10, which are connected to each other with a pipe having an air valve. The reserve tank 2 is provided with a water volume detecting float 18 and a cleaning oil detecting float 20. A cleaning solution containing 1-10% water is prepared by mixing water fed to the reserve tank 2 with the cleaning oil fed to the cleaning vessel 1 and the reserve tank 2 and is passed in the cleaning vessel 1 by the circulation pump 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a cleaning device for cleaning adhering water-soluble cutting oil for a metal product processed by using the water-soluble cutting oil (hereinafter referred to as "product"). TECHNICAL FIELD The present invention relates to a cleaning method and a cleaning device that can be effectively used even when the cleaning fluid is dried and becomes difficult to clean.

[0002]

2. Description of the Related Art When removing a cutting oil from a product processed with a water-soluble cutting oil to clean the product, wash it with a hydrocarbon-based cleaning liquid such as light oil or kerosene (hereinafter referred to as a cleaning oil). It is difficult to remove cutting oil. Therefore, conventionally, the product is immersed in a water displacing agent prepared by adding a surfactant to the washing oil to dissolve the water-soluble components that cannot be removed by the washing oil in the water displacing agent, and then the water displacing agent is removed I took the method of cleaning. In this method, it was necessary to perform a water replacement operation to wash away the water-soluble cutting oil before the water-soluble cutting oil attached to the product was dried.

[0003]

When the water-soluble cutting oil dries due to the delay of this cleaning treatment, white spot-like stains remain on the surface of the product, which is difficult to clean even if a water displacing agent is used. Is. Since the white spot-like stain is a water-soluble component, it is effective to carry out water washing as a pretreatment step for washing using the above-mentioned water displacing agent. Problems arise.

Since the water washing process is added, the device becomes large and it is necessary to install wastewater treatment equipment. as a result,
Processing costs increase. During the water replacement work in the next step, since the amount of water carried into the water replacement agent increases, the cleaning ability of the water replacement agent deteriorates.
The frequency of exchanging the water displacement agent increases. Water causes rust on the product surface.

According to the present invention, the surface of the product can be cleanly washed with the washing oil not only when the water-soluble cutting oil is undried but also after it is dried, and the washing liquid is washed while the washing is repeated. It is intended to obtain a cleaning method and a cleaning device capable of continuing the cleaning while recovering its performance when it deteriorates.

[0006]

A cleaning device for carrying out the cleaning method of the present invention has a cleaning tank, a water amount detecting float, a reserve tank provided with a cleaning oil detecting float, and an oil / water separator, and these are provided with valves. Connect with piping, circulate the cleaning oil and water with the circulation pump, and decompress the inside of the cleaning tank with the attached vacuum pump to perform the first cleaning liquid adjustment, cleaning, recovery of the cleaning liquid capacity during use, drying, etc. It is configured to.

[0007]

By adjusting the cleaning liquid so that the ratio of water in the cleaning oil is in the range of 1 to 10% and performing cleaning while maintaining this ratio, even if the water-soluble cutting oil is undried, it is dried. You can clean this even from the ground.

The cleaning apparatus of the present invention uses a reserve tank and a cleaning tank to adjust cleaning water having a water content of 1 to 10%, that is, water-soluble cutting oil on the surface of the product, which is circulated in the cleaning tank by circulating the cleaning liquid. It is something to wash.

When the water adhering to the product is mixed with the progress of cleaning and the water content in the cleaning liquid increases, the cleaning liquid is passed through an oil-water separator to separate and discharge the water to reduce the water content in the cleaning liquid. When the cleaning liquid deteriorates due to a large amount of oil, new cleaning oil can be added to restore the capacity and the cleaning can be continued.

When the inside of the cleaning tank is decompressed by the attached vacuum pump, the emulsification of the cleaning liquid by the ultrasonic oscillator attached to the cleaning tank is promoted, the cleaning action is improved, and the cleaning can be quickly completed, and the cleaning can be performed. Drying of finished products can be stopped.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the structure of an embodiment of the cleaning apparatus of the present invention.

This cleaning apparatus has a cleaning tank 1, a reserve tank 2, an oil-water separator 3 and a circulation pump 14, and the flow of the cleaning liquid among them and the pressure in the cleaning tank are automatically opened and closed by compressed air. The pipe is equipped with an air valve, which is a valve, and is controlled by a circulation pump to adjust the cleaning liquid and perform cleaning.

The washing tank 1 has an overflow port 4 formed on its upper side surface, and the overflow port 4 communicates with the reserve tank 2 through a pipe 6 having an air valve 5. The cleaning tank 1 is provided with a sealed lid 7, and the inside of the tank 1 is communicated with a vacuum pump 10 by a pipe 9 equipped with an air valve 8. An ultrasonic oscillator 11 is attached to the outer surface of the bottom of the cleaning tank 1. The bottom of the cleaning tank 1 communicates with a suction port 15 of a circulation pump 14 through a pipe 13 equipped with an air valve 12. A cleaning oil supply pipe 17 is connected to the pipe 13 via a stop valve 16.

In the reserve tank 2, there are provided a minimum water amount detecting float 18, a maximum water amount detecting float 19 and a cleaning oil detecting float 20 which output electric signals according to their respective positions. Reference numeral 21 is a liquid indicator for checking the state of the liquid in the tank 2. A cooler 22 is provided in the reserve tank 2. Cooling water is passed through the cooler 22 via the air valve 23, and cools the liquid in the reserve tank when the temperature rises. 24 is an overflow pipe equipped with an air valve 25 for discharging the excess amount of liquid in the reserve tank, 26 is a water supply pipe equipped with an air valve 27,
Reference numeral 28 denotes a pipe provided with an air valve 29, which connects the reserve tank 2 to an oil delivery pipe 30 of the oil / water separator 3. The bottom of the reserve tank 2 communicates with the suction port 15 of the circulation pump 14 through a pipe 32 equipped with an air valve 31.

A pipe 35 having a filter 34 is connected to the discharge port 33 of the circulation pump 14, the pipe 35 is branched, and one of the pipes 35 is provided with an air valve 36 to receive the oil-water separator 3. A pipe 39 leading to the liquid port and the other with an air valve 38
Leads to the cleaning tank 1. The oil delivery pipe 30 of the oil-water separator 3 communicates with the pipe 28 and also has a pipe 41 with an air valve 40.
To the cleaning tank 1 via the pipe 39. Reference numeral 42 is a drain pipe which is provided with an air valve 43 and communicates with a water outlet of the oil-water separator 3. Reference numeral 44 is a pipe for communicating the inside of the cleaning tank 1 to the atmosphere via the air valve 45, and 46 is a product. Each air valve, pump,
ON / OFF of the ultrasonic oscillator or the like is controlled by an attached controller (not shown).

This cleaning device is operated as follows.

First, the air valve 31 is closed and the air valve 27 is opened to supply water from the water supply pipe 26 to the reserve tank 2. When the water floats the minimum water amount detection float 18 and an electric signal is generated, the air valve 27 is closed and the water supply is stopped.

Next, the air valves 16, 38, 5 are opened to operate the circulation pump 14. The cleaning oil is drawn into the pump 14 from the cleaning oil supply pipe 17, passes through the filter 34, and the pipes 35, 3
It is put into the washing tank 1 from 9. When the cleaning tank 1 is filled with the cleaning oil, the cleaning oil passes from the overflow port 4 through the pipe 6,
It enters the reserve tank 2 via the air valve 5. When the amount of the cleaning liquid in the reserve tank reaches an appropriate amount, an electric signal is output from the floating cleaning oil detection float 20 to close the air valve 16 and open the air valve 31. As a result, the water in the reserve tank 2 and the cleaning oil in the reserve tank and the cleaning tank 1 are collected in the pipe 6,
32, circulation pump 14, pipe 35, filter 34, pipe 39
The washing liquid is circulated through and mixed with the washing oil to form a washing liquid containing water in an appropriate ratio.

The product 46 can be washed while circulating the above-described water and washing oil for circulation, but the case of washing the product with the washing liquid which has been mixed will be described below.

First, the product 46 to be cleaned is put in the cleaning tank 1, the lid 7 is sealed, the air valve 45 is closed, and the air valve 8 is opened.
The vacuum pump 10 is operated and the ultrasonic oscillator 11 is driven. This emulsifies a cleaning liquid obtained by mixing an appropriate amount of cleaning oil and water and cleans the product.

Water and cleaning oil are mixed in an appropriate ratio to form an emulsified state, and the undried or dried water-soluble cutting oil adhering to the product is washed. Vacuum pump 1 inside the cleaning tank 1
Since the pressure is reduced to 0, the transmission of ultrasonic waves emitted from the ultrasonic oscillator 11 becomes active and the emulsification of the cleaning liquid is significantly promoted. This emulsified state influences the cleaning effect of the product, and the cleaning effect is enhanced by promoting the emulsification. When the temperature of the liquid rises during washing, this is detected by a temperature sensor (not shown), and based on the output, the air valve 23 is opened to pass water to the cooler 22 to cool the liquid, and if the temperature becomes appropriate, The air valve 23 is closed.

When the cleaning is finished, the vacuum pump 10 and the ultrasonic oscillator 11 are stopped and the air valve 45 is opened to open the cleaning tank 1.
The inside of the cleaning tank 1 is brought to atmospheric pressure, and then the air valves 12, 36, 29, 43 are opened to transfer the cleaning liquid in the cleaning tank 1 to the pipe 13 and the circulation pump 1.
4, sent to the liquid receiving port of the oil / water separator 3 through pipes 35 and 37 to separate into cleaning oil and water, the water is discharged from the pipe 42, and the cleaning oil is returned to the reserve tank 2 through the pipes 30 and 28.

When all the liquid in the cleaning tank 1 is discharged,
By closing the air valves 5, 12, 45 and operating the vacuum pump 10 to reduce the pressure in the cleaning tank 1, it is possible to accelerate the drying of the product. Alternatively, in this state, the air valve 45 may be opened to ventilate the inside of the cleaning tank 1 to accelerate the drying.

When the dried product is taken out, the product to be washed next is put in the washing tank and the same operation is repeated. At this time, the previously used cleaning liquid can be reused and the cleaning liquid can be adjusted by appropriately supplementing the cleaning oil and water.

When the washing is repeated, the water in the undried water-soluble cutting oil is brought in, so that the amount of water gradually increases,
The surfactant in the cleaning oil may be discharged together with water, and the performance of the cleaning oil may deteriorate. As for the state, the liquid in the reserve tank 2 is sampled to see the separated state of water and cleaning oil, or the circulation of the cleaning liquid is paused for a short time to check the layered separated state of water and cleaning oil in the reserve tank. The quality of the water is judged by looking at the liquid indicator 21. When the cleaning solution is healthy,
When the cleaning liquid is left stationary, the liquid separates into two layers by positioning water in the lower layer and cleaning oil in the upper layer, but when the cleaning liquid deteriorates, a white turbid layer is formed between them, and when the deterioration further progresses Since it becomes cloudy, the performance state of the cleaning liquid can be known. If the surfactant in the cleaning oil is discharged together with water, the above-mentioned white turbidity occurs. At that time, the air valve 16,
38 is opened and the circulation pump 14 is operated to replenish the cleaning tank 1 with new cleaning oil.

When the cleaning liquid contains too much water, the air valves 31, 36, 29 and 43 are opened to operate the circulation pump 14 to guide the cleaning liquid in the reserve tank 2 to the oil-water separator 3. The separated water is discharged from the drain pipe 42,
The cleaning oil is returned from the pipe 28 to the reserve tank 2 and the cleaning tank 1
When the cleaning oil in the inside is insufficient, the air valve 40 is opened to allow the pipes 41 and 39 to flow into the cleaning tank 1. In this embodiment, the valve is an air valve which is an automatic valve without danger of ignition,
If safety can be ensured, automatic valves such as solenoid valves and motor valves can be used. Further, a valve that is opened and closed less frequently, such as the air valve 25 provided in the overflow pipe 24 of the reserve tank, can be a stop valve that is opened and closed manually.

As described above, this cleaning device is capable of adjusting the cleaning liquid by mixing an appropriate amount of water with the cleaning oil and passing the cleaning liquid through the cleaning tank to clean the product to which the water-soluble cutting oil is attached. Yes, the ability of the cleaning liquid can be inspected during cleaning, and good cleaning can be performed regardless of whether the cutting oil is dried.

[0028]

【The invention's effect】

1) The cleaning oil and water can be mixed at an appropriate ratio by the reserve tank 2 provided with the water amount detecting float and the cleaning oil detecting float.

2) The mixing ratio of cleaning oil and water can be maintained at an appropriate ratio of 1 to 10% with respect to the solvent by occasionally detecting it during repeated cleaning of many products.

3) Since a vacuum pump is provided to reduce the pressure in the cleaning tank, the emulsification of the cleaning liquid by the ultrasonic oscillator can be promoted to improve the cleaning effect, and the cleaning process does not need to be repeated, and the cleaning process can be quickly performed in one process The washing can be finished. Further, after finishing the washing, the product can be dried earlier in the washing tank.

4) The washing oil can be collected by the oil-water separator and used repeatedly.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a cleaning apparatus of the present invention.

[Explanation of symbols]

 1 Washing tank 2 Reserve tank 3 Oil-water separator 4 Overflow port 5 Air valve 6 Tube 7 Sealing lid 8 Air valve 9 Tube 10 Vacuum pump 11 Ultrasonic oscillator 12 Air valve 13 Tube 14 Circulation pump 15 Suction port 16 Air valve 17 Washing oil Supply pipe 18 Minimum water amount detection float 19 Maximum water amount detection float 20 Cleaning oil detection float 21 Liquid meter 22 Cooler 23 Air valve 24 Overflow pipe 25 Air valve 26 Water supply pipe 27 Air valve 28 Liquid pipe 29 Air valve 30 Oil delivery pipe 31 Air valve 32 Tube 33 Discharge port 34 Filter 35 Tube 36 Air valve 37 Tube 38 Air valve 39 Tube 40 Air valve 41 Tube 42 Drain pipe 43 Air valve 44 Tube 45 Air valve 46 Products

Claims (4)

[Claims] 1. Water is added to a hydrocarbon-based cleaning oil to form a cleaning liquid having a water content of 1 to 10%, and the water-soluble cutting oil adhered to a metal product processed using the water-soluble cutting oil is used as the cleaning liquid. A cleaning method comprising: 2. A metal product processed using water-soluble cutting oil and a hydrocarbon-based cleaning oil having a water content of 1 to 10% are housed in a sealable cleaning tank, and the cleaning tank is cleaned under reduced pressure. A cleaning method comprising irradiating ultrasonic waves in a tank to emulsify a cleaning solution and cleaning a metal product. 3. A cleaning tank (1), a reserve tank (2),
It has an oil / water separator (3) and a circulation pump (14), the cleaning tank (1) is provided with a sealing lid (7) and an overflow port (4), an ultrasonic oscillator (11) is attached, and a valve is used to open and close. A pipe (44) for communicating the inside of the cleaning tank with the atmosphere, a pipe (9) for communicating the vacuum pump (10) with the cleaning tank via a valve, and an overflow port (4) with a reserve tank (2) for the valve. (6) for communicating the bottom of the cleaning tank with the suction port (15) of the circulation pump (14) through a pipe (6) and a valve
, The reserve tank (2) is provided with a minimum water amount detection float (18), a maximum water amount detection float (19), and a wash oil detection float (20), and the bottom of the reserve tank is connected via a valve to the circulation pump. A pipe (32) communicating with the suction port (15), a pipe (28) for receiving the cleaning oil separated by the oil / water separator into the reserve tank through a valve, and a pipe (26) for supplying water into the reserve tank through the valve. ) Is provided, and the oil-water separator (3) has a pipe (37) for receiving a cleaning liquid, which is a mixture of cleaning oil and water, through the discharge port (33) of the circulation pump, and a valve for separating the cleaning oil. Through the washing tank (1)
Through a pipe (42) for discharging separated water through a valve, and a pipe (17) for supplying cleaning oil through a valve to a suction port of a circulation pump. Cleaning device. 4. A cleaning tank (1), a reserve tank (2),
Oil-water separator (3), circulation pump (14), valve for communicating vacuum pump (10), and pipe (1) for supplying cleaning oil
7), a pipe (44) for supplying the atmosphere, and a pipe (2) for supplying water
6) The cleaning device according to claim 3, further comprising a control device for controlling the opening / closing of the drain pipe (42) as an automatic valve according to a cleaning process.