JP3205894B2 - Degreasing method for cleaning aluminum parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning aluminum precision parts such as drums for VTRs mainly for the purpose of degreasing before assembly.

[0002]

2. Description of the Related Art Conventionally, precision aluminum parts such as VTR heads have been cleaned by immersion, ultrasonic cleaning and steam cleaning using Freon or trichloroethane as a cleaning liquid. However, since chlorofluorocarbon and trichloroethane are substances that destroy the ozone layer, their use has been regulated, and organic solvents such as methylene chloride (methylene chloride) have been used instead. Further, a cleaning method using an aqueous cleaning agent such as an alkali or a surfactant has been developed.

Further, a cleaning method using only pure water as a cleaning solution has been proposed (Japanese Patent Application No. 5-250537).
issue).

[0004]

However, in the cleaning method using an organic solvent such as methylene chloride, there is a problem of harmfulness of the organic solvent to a human body and also a problem of work safety such as a danger of explosion.

In the case of a cleaning method using a water-based cleaning agent such as an alkali or a surfactant or a cleaning solution containing only pure water,
There is a problem that white clouding due to electric corrosion or the like occurs on the surface of an aluminum component.

The change in the surface roughness at the white cloudy portion is much smaller than the so-called machining bite roughness, but the mechanism of the electrical corrosion that causes the white cloudy cloud is shown in FIGS. It is supposed to be.

That is, for example, a VTR made of aluminum
When the cleaning drum is used as a work, at the start of cleaning, as shown in FIG. 3, an oil film (53) exists on the surface of the work (52) containing the Cu / Ni particulate matter (51) in the RO water. And
As the cleaning progresses, the oil film (53) is partially peeled off here and there, and at the contact surface (work cleaning surface) between the RO water and the work (52), the Cu / Ni particulate matter (51) and the Al base material (52a) Between Al
A local battery action occurs where electrons move to the Cu / Ni particulates (see FIG. 4). Then, with the occurrence of the local battery action, Al ions are eluted into the RO water (start of electric corrosion), and as the cleaning proceeds, the cleaning surface of the work (52) expands and the above-described electric corrosion proceeds (see FIG. 5). ).

[0008] Further, as the cleaning progresses, the adhered oil changes from a film form to a drop form as the cleaning surface of the work (52) expands, and Cu / Ni particles are removed from the Al base material (52a) by the progress of electric corrosion. The object (51) falls off (see FIG. 6). And the last oil droplet is the work (5
2) Washing is completed at the point away from the surface.
(52) is drained and dried.

As shown in FIG. 7, the work (52) after drying is mirror-finished at the point (A) where oil droplets adhered until the end of the cleaning due to a short electric corrosion time. In the range (B) where the oil film was separated and the electric corrosion time was long, the Cu / Ni particulates (51) fell off, the light reflectance was low, and a white cloud was formed. When the work (52) is viewed as a whole, a mottled pattern is formed by the mirror surface state and the white cloudy state.

It is an object of the present invention to provide a cleaning method which is harmless to the human body and the environment, and in which a water-based cleaning agent such as an alkali or a surfactant is rinsed with city water or pure water, or only pure water is used as a cleaning liquid. An object of the present invention is to provide a degreasing cleaning method in which white clouding does not occur on a work surface in a process.

[0011]

The degreasing and cleaning method of the present invention has been devised to achieve the above object. A work to be cleaned is first immersed in a first tank, and bubbling or underwater is performed from below. A step of taking a shower of pure water from above when the workpiece is pulled up after rough cleaning by a jet,
A step of immersing the work coming from the first tank, if necessary, in a second tank and pre-washing the work with ultrasonic waves or ultrasonic waves and an underwater jet, and then taking a shower of pure water from above when pulling up the work; A step of adding sodium silicate to water or pure water supplied to the third tank so as to have a concentration of 50 to 200 ppm as SiO ₂ , and immersing a work coming from the first tank or the second tank in the third tank. After the main cleaning with ultrasonic waves and underwater jets, a step of taking a shower of pure water from above when pulling up the work, and finally immersing the work coming from the third tank in the fourth tank, and performing the final washing with the underwater jet. , Ri Do and a pulling Ru step, as the washing liquid of the second tank, a third SogaMitsuru
It becomes water and overflows from here and flows into the second tank
The second tank is used as the cleaning liquid for the first tank.
When it is full, it overflows from here and flows to the first tank
Those that crowded is shall be used.

In the cleaning method, the ultrasonic treatment for the pre-cleaning and the main cleaning is preferably performed continuously during the cleaning. The underwater jet treatment for the main cleaning and the final cleaning is preferably performed intermittently.

In a preferred embodiment of the present invention,
A low-grade pure water having a resistivity of 1.0 MΩ · cm or less is supplied as washing water to the third tank, and is used as shower water for the first tank, and, if necessary, the second tank and the third tank. the high grade purified water 1.0~15MΩ · cm is supplied to the fourth tank as washing water.

The low-grade pure water is preferably water obtained by treating raw water with a reverse osmosis membrane device, and the high-grade pure water is preferably water obtained by treating low-grade pure water with an evaporation high-temperature pure water producing apparatus. Further, sodium silicate is added to the cleaning liquid supplied to the third tank by Si.
Added as O ₂ so that 50~200ppm in the case of less than 50ppm as SiO _2, the effect is insufficient due to the addition of sodium silicate, also 200pp
This is because, when added in excess of m 2, fine white particles, which are considered to be residues of sodium silicate, are seen as dirt on the surface of the cleaned component.

The water temperature in the third and fourth tanks is preferably 45-60 ° C., and the water temperature in the first tank is preferably 40 ° C. or higher.

It is also preferable to blow compressed air onto the work before immersing it in the first tank to blow off deposits on the work surface.

When an aqueous cleaning agent such as an alkali or a surfactant is used as the cleaning agent, a predetermined amount of the sodium silicate may be added to city water or pure water in a process other than the cleaning bath and the finishing bath. is there.

In this specification, the term "aluminum" includes pure aluminum as well as aluminum alloys.

[0019]

According to the degreasing and cleaning method of the present invention, first, grease and cuttings adhering to the work are cleaned by bubbling or underwater jet in the first tank. In the second tank, the work is further cleaned by ultrasonic cavitation, and when a submerged jet is used together, the oils and the like obtained by the ultrasonic cleaning do not stay in the vicinity of the work,
Since it is diffused into the tank by the water flow of the underwater jet, it does not re-attach to the work. Further, in the third tank as well, cleaning by ultrasonic waves and underwater jets is performed similarly to the above-mentioned second tank, so that fats and oils and cutting chips adhering to the work are almost completely removed. Moreover, by adding sodium silicate in the above-mentioned predetermined amount to the washing water, the growth of barrier light due to hydration hardly occurs on the work surface, so that elution of aluminum ions caused by electric corrosion on the work surface is effectively performed. This prevents white fogging and does not cause soiling due to excess sodium silicate residue. Then, the work after the cleaning is finally rinsed by the underwater jet in the fourth tank.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of an embodiment in which degreasing and cleaning of precision aluminum parts is performed according to the present invention with reference to the accompanying drawings.

Embodiment 1 A cleaning flow shown in FIG. 1 is composed of a cleaning device (1) and the same device (1).
Reverse osmosis membrane device (2) for supplying low-grade pure water to the third tank (11c) and evaporation method for supplying high-grade pure water to the fourth tank (11d) of the cleaning device (1) High temperature pure water production equipment (3)
A chemical liquid injector (17) having a sodium silicate solution tank (17a) for supplying sodium silicate to the third tank (11c) and an injection pump (17b); and compressed air in the first tank (11a). Compressed air supply device (4) for supplying air.

The cleaning device (1) comprises a first tank (11a) and a second tank (1
1b), a washing tank composed of a third tank (11c) and a fourth tank (11d)
(11), an air bubble generator (12) arranged inside the bottom of the first tank (11a), and ultra-high pressure devices provided on the outer surfaces of the bottoms of the second tank (11b) and the third tank (11c). Sound wave generators (13a) (13b),
An underwater jet generator (14a) (14b) disposed inside the bottom of each of the third tank (11c) and the fourth tank (11d);
(11a), shower spray headers (15a) (15b) (1) disposed above the second tank (11b) and the third tank (11c), respectively.
5c) and a drying device (16).

The bubble generator (12) comprises a nozzle header (18) for ejecting bubbles, an on-off valve (19), and a flow (or pressure) regulator (20). Ultrasonic generator (13a) (13b)
Has a transmitter and a vibrator. The underwater jet generators (14a) and (14b) are provided with nozzle headers (14
c) and the water in the washing tank is sucked in and 3 to 10 kg / c.
circulating pump for supplying the nozzle header (14c) at a pressure of m ²
(5)

In the above configuration, city water or industrial water is treated in the reverse osmosis membrane device (2) as raw water and the temperature is 50 to 5 ° C.
Low-grade pure water at 5 ° C. and a specific resistance of about 0.1 to 1.0 MΩ · cm is produced. This low-grade pure water is supplied to the third tank (1
1c) is continuously supplied to the bottom, while sodium silicate is converted to about 50% as SiO ₂ from the chemical solution injection device (17).
It is added to become ppm.

A part of the low-grade pure water produced by the reverse osmosis membrane device (2) is treated by a distillation high-temperature pure water production device (3), and is heated to a temperature of 50 to 55 ° C. and a specific resistivity of 10 to 50 ° C. 15MΩ
・ High grade pure water of about cm is produced. It should be noted that sodium silicate is not added to the low-grade pure water supplied to the distillation high-temperature pure water producing apparatus (3).

The high-grade pure water is intermittently supplied to the bottom of the fourth tank (11d). On the other hand, low-grade pure water containing a predetermined concentration of sodium silicate is supplied to each of the spray headers in the first to third tanks.
(15a), (15b) and (15c) are continuously supplied. Third tank (11c)
The low-grade pure water supplied to the tank overflows from this tank when the tank is full, flows into the second tank (11b),
Further, the same flows from the second tank (11b) to the first tank (11a). The first tank (11a) is full and overflowing water is drained. The high-grade pure water supplied to the fourth tank (11d) overflows when the tank is full, and the overflow water is also drained as washing wastewater.

When the washing is started and the washing basket containing the work is conveyed to a predetermined position above the first tank (11a), the bubble generator (12) provided at the inner bottom of the first tank (11a). ) Is supplied with compressed air from a compressed air supply device (4), whereby a large number of fine bubbles are generated and spread throughout the first tank (11a) and boil on the water surface. Along with this, the washing basket starts descending and sinks into the washing liquid in the first tank (11a). During immersion, the washing basket is swung up and down as far as it does not come out of the water,
After a predetermined time elapses, it is lifted from this tank and
The supply of compressed air to (12) also stops. Then, the first tank (11
a) Spraying of shower water is started from the upper spray header (15a), and the work is showered with the washing basket. After spraying the shower water for a predetermined time, the shower stops, and the washing basket is moved above the second tank (11b).

When the washing basket reaches a predetermined position above the second tank (11b), the ultrasonic generator (13a) provided on the inner bottom outer surface of the second tank (11b) operates, and the second tank (11b) is activated. Ultrasonic vibration waves spread throughout the interior. Along with this, the washing basket starts descending and sinks into the washing liquid in the second tank (11b). During immersion, the washing basket
It swings up and down within a range not to reach the water surface, and after a predetermined time elapses, is lifted from this tank, and the ultrasonic generator (13a) also stops. Next, the spray header (15b) above the second tank (11b)
The spray of shower water is started from, and the work is showered with the washing basket. After spraying the shower water for a predetermined time, the shower stops, and the washing basket is moved to the third tank (11c).

When the washing basket reaches a predetermined position above the third tank (11c), the ultrasonic generator (13b) provided on the inner bottom surface of the third tank (11c) is activated, and the third tank (11c) is activated. Ultrasonic vibration waves spread throughout the interior. Along with this, the washing basket starts to descend,
3rd in which sodium silicate was added by chemical liquid injector (17)
Submerged in the cleaning solution in the tank (11c). During immersion, the washing basket is swung up and down within a range that does not reach the surface of the water. After a predetermined time,
3rd tank (11c) Underwater jet generator installed at the bottom inside
(14a) is activated, and the jetted water flow by the underwater jet spreads simultaneously with the vibration wave by the ultrasonic wave throughout the third tank (11c). During this time, the swinging of the washing basket is continued, and after a lapse of a predetermined time, the washing basket is lifted from the tank, and the ultrasonic generator (13b) and the underwater jet generator (14a) are stopped. Then, the third tank (1
1c) Shower water is sprayed from the upper spray header (15c), and the work takes a shower with the washing basket. After spraying the shower water for a predetermined time, the shower stops, and the washing basket is moved to the fourth tank (11d).

In the above-described processing in the first tank (11a) to the third tank (11c), the sodium silicate added to the low-grade pure water by the chemical liquid injector (17) is supplied to the shower spray header ( 15a, 15b, and 15c, respectively, and the cleaning liquid that sequentially overflows from the third tank (11c) to the first tank (11a).

When the washing basket reaches a predetermined position above the fourth tank (11d), the underwater jet generator (14b) provided at the bottom of the fourth tank (11d) is activated, and the inside of the fourth tank (11d) is activated. Spray water flow by the underwater jet spreads over the whole. Along with this, the washing basket starts descending and sinks into the fourth tank (11d). During the immersion, the washing basket is swung up and down within a range that does not reach the water surface, and after a predetermined time elapses, is lifted out of the tank, and the underwater jet generator is stopped.

After the washing basket containing the work is lifted from the fourth tank (11d), it is drained and dried by the drying device (16).
Washing is completed. As the draining and drying methods, air blow, hot air drying and the like are generally used, but vacuum drying and other methods can also be performed.

Observation of the surface of the work cleaned by the method of the present embodiment showed no white clouding due to electric corrosion or contamination of white particles due to excess residue of sodium silicate, and the entire surface of the work was in a mirror state. Was.

On the other hand, when the same cleaning as in this example was performed without adding sodium silicate, white cloudiness was observed on the work surface.

Example 2 The cleaning flow shown in FIG. 2 is based on the cleaning device (21) and the cleaning device (21).
Reverse osmosis membrane device (22) for supplying low-grade pure water to the third tank (21c) and evaporation method for supplying high-grade pure water to the fourth tank (21d) of the washing device (21) High temperature pure water production equipment (31)
A chemical liquid injector (27) having a sodium silicate solution tank (27a) for supplying sodium silicate to the third tank (21c) and an injection pump (27b); and compressed air to the fifth tank (21e). And an oil-water separator (30) for removing oil from wastewater flowing out of the first tank (21a).

The cleaning device (21) comprises a first tank (21a) and a second tank (2
1b), a washing tank composed of a third tank (21c) and a fourth tank (21d)
(21A), a fifth tank (21e) serving as a drain tank, and a drying device (2
6).

Ultrasonic generators (23a) and (23b) are provided on the outer surfaces of the bottoms of the second tank (21b) and the third tank (21c), respectively.
Underwater jet generators (24a) (24b) (24c) (24d) are arranged inside the tank bottoms of the first tank (21a) to the fourth tank (21d), respectively.
Similarly, shower spray headers (25a) (25b) (25c) (25d) are arranged above the first tank (21a) to the fourth tank (21d), respectively. Supply of the cleaning liquid to each underwater jet generator (24a) (24b) (24c) and each shower spray header (25a) (25b) (25c) in the first tank (21a) to the third tank (21c) Is selectively performed by switching solenoid valves (29a) (29b) (29c) provided on the discharge side of each circulation pump (28a) (28b) (28c). The underwater jet generator of the 4th tank (21d)
(24d) is supplied with a cleaning liquid by a circulation pump (29d), and a shower spray header (25d) of a fourth tank (21d) is supplied with high-grade pure water from an evaporating high-temperature pure water production device (31). Supplied.

In the above configuration, city water or industrial water is treated in the reverse osmosis membrane device (22) as raw water, and the temperature is 50 to 5 ° C.
Low-grade pure water at 5 ° C. and a specific resistance of about 0.1 to 1.0 MΩ · cm is produced. This low-grade pure water is supplied to the third tank (2
1c) is continuously supplied to the bottom, while sodium silicate is converted to about 50% as SiO ₂ from the chemical solution injector (27).
It is added to become ppm.

A part of the low-grade pure water produced by the reverse osmosis membrane device (22) is treated by a distillation high-temperature pure water production device (31), and is heated to a temperature of 50 to 55 ° C. and a specific resistivity of 10 to 50 ° C. 15MΩ
・ High grade pure water of about cm is produced. Note that sodium silicate is not added to the low-grade pure water supplied to the distillation high-temperature pure water producing apparatus (31).

The high-grade pure water is intermittently supplied to the shower spray header (25d) of the fourth tank (21d). The low-grade pure water containing a predetermined concentration of sodium silicate supplied to the third tank (21c) overflows from the third tank (21c) when the third tank (21c) is full, and flows into the second tank (21b). Then, it flows into the first tank (21a) from the second tank (21b). The first tank (21a) is filled with water and overflows therefrom. The oil is removed by an oil-water separator (30) as a washing waste liquid and then drained. The high-grade pure water supplied to the fourth tank (21d) overflows when the fourth tank (21d) is full, and the overflow water is mixed with the low-grade pure water to form a distillation high-temperature pure water production apparatus ( 31).

When the cleaning is started, the first tank (21a) to the fourth tank (21a)
Each circulating pump (28a) (28b) (28c) (28d) in the tank (21d) operates and each underwater jet generator (24a) (24b) (24c) (24d)
The washing water is sprayed from.

The washing basket containing the work is transported to a predetermined position above the first tank (21a), and then the washing basket descends and sinks into the washing liquid in the first tank (21a). The washing basket during immersion is swung up and down within a range not to reach the surface of the water, and after a predetermined time elapses, is lifted out of this tank and transported to a position below the spray header (25a) above the first tank (21a). Then, when the washing basket stops at a predetermined position, the solenoid valve (29a) is operated to switch from jetting of washing water by the underwater jet generator (24a) to jetting of shower water by the spray header (25a), and washing is performed. The work in the basket takes a shower. After the shower water is injected for a predetermined time, the shower is stopped by switching the solenoid valve (29a), and the underwater jet generator (24a) is operated again. Thereafter, the washing basket is moved above the second tank (21b).

When the washing basket reaches a predetermined position above the second tank (21b), the ultrasonic generator (23a) provided on the outer surface of the inner bottom of the second tank (21b) operates, and the second tank (21b) is activated. Ultrasonic vibration waves spread throughout the interior. The underwater jet generator (24b) in the tank (21b) is also operating. In this state, the washing basket descends and sinks into the washing liquid in the tank (21b). During the immersion, the washing basket is swung up and down within a range that does not come out of the water surface, and is lifted out of the tank after a predetermined time has elapsed, and the ultrasonic generator
(23a) stops. Next, the washing basket is transported to a position below the spray header (25b) above the second tank (21b). When the washing basket stops at a predetermined position, the solenoid valve (29
b) is activated to switch from jetting of washing water by the underwater jet generator (24b) to jetting of shower water by the spray header (25b), and the work in the washing basket takes a shower. After the shower water is sprayed for a predetermined time, the solenoid valve (29
By switching b), the shower stops and the underwater jet generator (24b) operates again. After that, the washing basket is the third
It is moved above the tank (21c).

When the washing basket reaches a predetermined position above the third tank (21c), the ultrasonic generator (23b) provided on the inner bottom outer surface of the third tank (21c) is activated, and the third tank (21c) is activated. Ultrasonic vibration waves spread throughout the interior. The underwater jet generator (24c) in the tank (21b) is also operating. In this state, the washing basket starts descending, and sinks into the washing liquid in the third tank (21c) to which sodium silicate is added by the chemical liquid injector (27). During immersion, the washing basket is swung up and down within a range that does not reach the surface of the water. The washing basket is pulled out of the tank after a predetermined time has elapsed, and the ultrasonic generator (23b) stops. Next, the washing basket is transported to a position below the spray header (25c) above the third tank (21c). Then, when the washing basket stops at a predetermined position, the solenoid valve (29c) is operated, and the spray water (25c) is injected from the injection of the washing water by the underwater jet generator (24c).
It switches to spraying shower water, and the work in the washing basket takes a shower. After the shower water is injected for a predetermined time, the shower is stopped by switching the solenoid valve (29c), and the underwater jet generator (24c) operates again. Thereafter, the washing basket is moved above the fourth tank (21d).

In the above-described processing in the first tank (21a) to the third tank (21c), the sodium silicate added to the low-grade pure water by the chemical liquid injector (27) is supplied to the shower spray header ( 25a, 25b, and 25c, respectively, and the washing liquid that sequentially overflows from the third tank (21c) to the first tank (21a).

When the washing basket reaches a predetermined position above the fourth tank (21d), the washing basket starts descending and sinks into the fourth tank (21d). During the immersion, the washing basket is swung up and down so as not to reach the surface of the water, and the work in the washing basket is rinsed by the water flow of the underwater jet generator (24d). The washing basket is lifted from this tank after a lapse of a predetermined time, and transported to a position below the spray header (25d) above the fourth tank (21d). During this time, the underwater jet generator (24d) operates continuously.

When the washing basket stops at a predetermined position, high-grade pure water is sprayed from the spray header (25d), and the work in the washing basket is showered with high-grade pure water. After a predetermined time of spraying the shower water, the shower stops. Thereafter, the washing basket is transported above the fifth tank (21e).

When the washing basket reaches a predetermined position above the fifth tank (21e), the washing basket descends and is conveyed to a predetermined position of the draining air nozzle header (32). Then, when the washing basket stops at a predetermined position, the compressed air supply device (33) operates to supply compressed air, which is jetted from the draining air nozzle header (32), thereby attaching to the workpiece and the washing basket. Water is blown away. After the injection of the compressed air for a predetermined time, the compressed air supply device (33) is stopped to interrupt the supply of the compressed air, and the washing basket is transported to the bottom of the fifth tank (21e).

The washing basket conveyed to the bottom of the fifth tank (21e) is further conveyed to the drying device (26). In the drying device (26), hot air is supplied from a hot air generator having an automatic temperature control function, and the work in the washing basket is completely dried by the hot air. Then, the washing basket containing the dried work is taken out of the drying device (26).

When the surface of the work cleaned by the method of this embodiment was observed, no white clouding due to electric corrosion and no contamination of white particles due to excess residue of sodium silicate were observed, and the entire surface of the work was in a mirror state. Was.

[0051] On the other hand, about 1 sodium silicate as SiO ₂
When cleaning was performed in the same manner as in this example with the addition of 0 ppm, white cloudiness was observed on the work surface.

Further, about 3% of sodium silicate as SiO ₂ is used.
When the cleaning was performed in the same manner as in the present example by adding so that the concentration became 00 ppm, the work surface did not show white cloudiness due to the electrical corrosion, but the white particles were stained by the excess residue of sodium silicate. Admitted.

[0053]

According to the degreasing method of the present invention, first, the oils and fats and cutting chips adhering to the work are cleaned by bubbling or underwater jet in the first tank. In the second tank, the work is further cleaned by ultrasonic cavitation, and when a submerged jet is used in combination, the oils and the like obtained by the ultrasonic cleaning do not stay in the vicinity of the work, and the submersible jet is removed. Since it is diffused into the tank by the water flow, it does not adhere again to the work. Further, in the third tank as well, cleaning by ultrasonic waves and underwater jets is performed similarly to the above-mentioned second tank, so that fats and oils and cutting chips adhering to the work are almost completely removed. Moreover, by adding sodium silicate in the above-mentioned predetermined amount to the washing water, the growth of barrier light due to hydration hardly occurs on the work surface, so that elution of aluminum ions caused by electric corrosion on the work surface is effectively performed. This prevents white fogging and does not cause soiling due to excess sodium silicate residue. Then, the work after the cleaning is finally rinsed by the underwater jet in the fourth tank.

Therefore, the surface of the aluminum part cleaned by the degreasing method of the present invention is always in a mirror state. Further, there is no problem of harm to the human body and problems in work safety as in the conventional washing with an organic solvent.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a cleaning method of Example 1.

FIG. 2 is a flow sheet showing a cleaning method of Example 2.

FIG. 3 is a cross-sectional view showing a state when cleaning of an aluminum component is started by a conventional cleaning method.

FIG. 4 is a cross-sectional view showing an initial stage of cleaning in the conventional cleaning method.

FIG. 5 is a cross-sectional view showing a state of elution of aluminum ions in a conventional method.

FIG. 6 is a cross-sectional view showing a state in which Cu / Ni particulate matter is dropped off in the same conventional method.

FIG. 7 is a sectional view showing a state after cleaning by the conventional method.

[Explanation of symbols]

(1) (21): Cleaning device (2) (22): Reverse osmosis membrane device (3) (32): Evaporation high-temperature pure water production device (4): Compressed air supply device (12): Bubble generation device ( 13a) (13b) (23a) (23b): Ultrasonic generator (14a) (14b) (14c) (24a) (24b) (24c) (24d): Underwater jet generator (15a) (15b) (15c) ) (25a) (25b) (25c) (25d) ： Spray header for shower

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyuki Miyake 5-3-28 Nishikujo, Konohana-ku, Osaka-shi Inside Tachibashi Shipbuilding Co., Ltd. (72) Ryoichi Kishikawa 5-28-3 Nishikujo, Konohana-ku, Osaka-shi (56) References JP-A-6-116768 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C23G 1/00 B08B 3/10-3 / 12

Claims (1)

(57) [Claims] A first step of immersing a workpiece to be cleaned in a first tank, performing a rough cleaning by bubbling or underwater jet from below, and then taking a shower of pure water from above when pulling up the workpiece; The work is immersed in the second tank, if necessary, and is pre-washed by ultrasonic waves or ultrasonic waves and a submerged jet, and then is subjected to a shower of pure water from above when the work is pulled up, and is supplied to the third tank. as SiO ₂ and sodium silicate in water or pure water is 50 to 20
0 ppm, and the first tank or the second tank.
A step of immersing the work coming from the tank in the third tank, performing main cleaning with ultrasonic waves and a submerged jet, and taking a shower of pure water from above when pulling up the work; by immersion in a bath, after finishing washing by water jet, Ri Do and a pulling Ru step, as the washing liquid of the second tank, from which a third tank becomes full water
The one that overflows and flows into the second tank is used
As the cleaning liquid for the first tank, the second tank becomes full
The one that overflows from and flows into the first tank is used
Degreasing method aluminum parts and the like that are.