JP4612163B2 - Cleaning method and cleaning apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning method and a cleaning apparatus for cleaning an object to be cleaned that needs to be cleaned at a relatively low temperature, for example, a honeycomb core alone and a honeycomb core having a plate member bonded to one side using a normal paraffin cleaning solution.
[0002]
[Prior art]
Since the honeycomb sandwich structure has a characteristic that the mechanical strength is larger than the weight, the honeycomb sandwich panel in which the plate material is bonded to both sides of the honeycomb core is used for an aircraft, an artificial satellite, or the like that is required to be lightweight and highly rigid. Widely applied to structural materials.
[0003]
Many non-ferrous metals such as aluminum alloy, magnesium, and titanium are used as the material for the honeycomb core. The honeycomb core is made of these metals in the form of foil, and this foil is partially bonded to form a hexagonal cell. It is manufactured by being expanded into a mold, a quadrangular cell mold or the like, and has a bonded portion (node bond) as a feature of the structure. Further, the honeycomb sandwich panel is manufactured by each process of cutting the honeycomb core on one side, bonding the plate material to the cut surface, cutting the other side of the honeycomb core, and bonding the plate material to the cut surface. The board material is bonded using a cured epoxy film adhesive.
[0004]
The bonding performance and bonding durability between the honeycomb core and the plate material have a significant effect on the mechanical strength and durability of the entire structural material after the honeycomb sandwich panel is used as an aircraft structural material, either primary or secondary bonded. Therefore, it is necessary to sufficiently clean the plate material, the honeycomb core alone, and the honeycomb core having the plate material bonded to one side before bonding.
[0005]
In the pre-bonding cleaning of the honeycomb core, steam degreasing using a chlorine-based solvent such as trichloroethane and trichloroethylene has been conventionally performed. However, in Japan, the Montreal Protocol on the protection of the stratospheric ozone layer was adopted on September 30, 1988 in Japan, and its production, import and use have been prohibited since 1996, and it can no longer be used for cleaning. Trichlorethylene is being addressed in the direction of stricter regulations, although there are no regulations under the Air Pollution Control Law but concerns about health problems and environmental pollution of workers. Fluorine solvents (HCFC: hydrogen, chlorine, fluorine, carbon compounds), which are alternative cleaning agents for the above chlorinated solvents, have also been decided to be completely abolished by 2020. There is an urgent need to consider cleaning methods.
[0006]
On the other hand, in JP-A-9-71883, an aqueous degreasing method using an aqueous solution mainly composed of alkali salts or surfactants reduces the strength of node bonds due to moisture absorption by the adhesive, and alkali salts and moisture are reduced. It is unsuitable because it stays inside the core and causes corrosion damage during the production period or operation period. It is also unsuitable for hydrocarbon solvents (N-methyl-2-pyrrolidone, normal paraffin, isoparaffin, naphthene). System), quasi-aqueous system (solutions mainly composed of alcohol, water and surfactant), halides, alcohols, and ketones. Normal paraffin detergents that do not contain additives are used to clean honeycomb cores. It is disclosed that it is suitable.
[0007]
[Problems to be solved by the invention]
On the other hand, for honeycomb cores having various cell shapes, cell sizes and thicknesses, and honeycomb cores having a plate bonded to one side, in order to perform sufficient cleaning, the cleaning liquid is applied from below with the open end of the cells facing downward. It is considered effective to supply and wash. In addition, if the cleaning solution does not reach the back of the cell sufficiently, contaminants attached when the honeycomb core is cut, etc. will remain, and it will be difficult to ensure sufficient adhesion strength and adhesion durability when assembling the honeycomb sandwich panel. It is a concern.
[0008]
Accordingly, an object of the present invention is to clean and sufficiently clean the honeycomb core alone and the honeycomb core in which the plate material is bonded to one side surface, using a normal paraffin cleaning liquid that does not have a problem regarding health problems and environmental pollution of the worker, For example, it is to provide a cleaning method and a cleaning apparatus applicable to cleaning of an object to be cleaned that does not like to be burned by heat, such as magnesium and titanium, and an object to be cleaned that does not like immersion in a liquid layer.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 for achieving the above-described object is a to-be-cleaned object arranging step for disposing a to-be-cleaned object in a cleaning chamber, and a pressure in the cleaning chamber in a range of 0.27 to 4.00 kPa. And while maintaining the temperature of the object to be cleaned in the range of 70 to 85 ° C., the normal paraffin cleaning liquid is jetted from below to clean the object to be cleaned, and the atmospheric pressure in the cleaning chamber is 1.33 kPa or less, And a drying step of drying the object to be cleaned while maintaining the temperature of the object to be cleaned in the range of 70 to 85 ° C. In the cleaning process, after the normal paraffin cleaning liquid is introduced into the cleaning liquid storage section disposed in the lower part of the cleaning chamber, the cleaning liquid is boiled in which the cleaning liquid is boiled while maintaining the atmospheric pressure in the range of 0.27 to 1.33 kPa. And at least one step of supplying an inert gas into the cleaning liquid so that the cleaning liquid is pushed up while maintaining the pressure in the cleaning chamber in a range of 1.33 to 4.00 kPa, This is a step of cleaning the object to be cleaned by spraying a cleaning liquid from below the object to be cleaned. It is characterized by that.
[0010]
According to the cleaning method of the first aspect, since the temperature of the object to be cleaned is maintained in the temperature range of 70 to 85 ° C. throughout the cleaning and drying process, it is possible to clean even non-ferrous metals that dislike burning due to heat. it can. In the cleaning process, the pressure in the cleaning chamber is in the low pressure range of 0.27 to 4.00 kPa. According to the cleaning liquid boiling process, normal paraffin cleaning liquid is sprayed in multiple directions from the bottom of the object to be cleaned, so that the mist-like normal paraffin particles reach the back of the object to be cleaned having a complex shape and be cleaned well. Can do. According to the inert gas supply step, the normal paraffin cleaning liquid is sprayed vertically from the lower part of the object to be cleaned under a low pressure condition where the pressure in the cleaning chamber is 1.33 to 4.00 kPa. Normal paraffin particles reach the back of the object to be cleaned with the pressure of the inert gas. A clean object can be achieved even with a to-be-cleaned object having a small heat capacity, for which the effect of general steam degreasing cannot be expected so much, and an object to be cleaned that does not like immersion in a liquid layer can also be cleaned.
[0011]
According to a second aspect of the present invention, the object to be cleaned in claim 1 is a honeycomb core having a honeycomb core alone or a plate member bonded to one side surface, and the open end of the cells of the honeycomb core is directed downward in the object to be cleaned arrangement step. It is characterized by being placed horizontally in the cleaning chamber. According to this cleaning method, since the temperature of the honeycomb core is maintained in the temperature range of 70 to 85 ° C. throughout the cleaning and drying process, it is possible to prevent deterioration in the adhesive strength of the bonded portion between the honeycomb core and the plate material. Because the open end of the honeycomb core faces downward, mist-like normal paraffin particles are supplied from below, and the contaminated cleaning liquid drops downward, so a honeycomb with a plate attached to one side with a complex shape Clean up to the back of the core.
[0012]
According to a third aspect of the present invention, the object to be cleaned is swung horizontally in the cleaning step. According to this cleaning method, normal paraffin particles are supplied without blind spots to the back and details of the object to be cleaned, so that cleaning can be performed thoroughly.
[0015]
Claim 4 According to the invention described in item 1, the vapor of the normal paraffin cleaning liquid in the temperature range of 70 to 85 ° C. is maintained between the cleaning object arranging step and the cleaning step while maintaining the atmospheric pressure in the cleaning chamber at 1.33 to 4.00 kPa. It has a primary steam degreasing step for supplying steam into the cleaning chamber and cleaning the object to be cleaned with steam. According to this cleaning method, steam in the temperature range of 70 to 85 ° C. is supplied into the cleaning chamber, so that the object to be cleaned can be heated and oil, chips, adhesives, dust, etc. are lifted up. In addition, the wettability of the object to be cleaned during the cleaning process can be improved.
[0016]
Claim 5 According to the invention, the cleaning process is performed by supplying a shower liquid made of a normal paraffin cleaning liquid from below the object to be cleaned to clean the object to be cleaned between the cleaning process and the drying process. A secondary steam degreasing step of supplying a vapor of a normal paraffin cleaning liquid in a temperature range of 70 to 85 ° C. while keeping the temperature in a range of 33 to 4.00 kPa into the cleaning chamber to steam clean the object to be cleaned. Features. According to this cleaning method, a clean cleaning liquid is supplied from the lower part of the object to be cleaned in the final cleaning process, so that sufficient final cleaning is possible. In the secondary steam degreasing process, immersion in the liquid layer is preferred by steam cleaning. It is possible to finish and clean the object to be cleaned, and to accelerate drying.
[0017]
Claim 6 The invention described in (1) includes a sealable cleaning chamber in which an object to be cleaned is disposed, cleaning liquid vapor supply means for supplying cleaning liquid vapor into the cleaning chamber, vacuum suction means for vacuum suction of the cleaning chamber, Shower liquid supply means that is disposed in the lower portion and supplies shower liquid from below the object to be cleaned, a cleaning liquid storage section that is disposed further below the shower liquid supply means in the cleaning chamber, and a cleaning liquid storage section Normal paraffin A cleaning liquid supply means for supplying a cleaning liquid, a cleaning liquid discharge means for discharging the cleaning liquid disposed at the bottom of the cleaning liquid storage section, and an inert gas supply means for supplying an inert gas into the cleaning chamber disposed in the cleaning liquid storage section And a cleaning chamber temperature adjusting means for adjusting the temperature in the cleaning chamber to 70 to 85 ° C. e , The inert gas supply means cleans the object to be cleaned by spraying a cleaning liquid from below the object to be cleaned in a state where the pressure in the cleaning chamber is maintained in the range of 1.33 to 4.00 kPa by the vacuum suction means. In order to push up the cleaning solution so that the cleaning solution is pushed up. A cleaning device characterized by the above. According to this cleaning apparatus, the cleaning method according to claim 1 can be effectively carried out.
[0018]
A seventh aspect of the present invention is the cleaning apparatus according to the seventh aspect, further comprising swinging means for swinging an object to be cleaned disposed in the cleaning chamber in a horizontal direction. According to this cleaning apparatus, normal paraffin particles are supplied without blind spots to the back and details of the object to be cleaned, so that cleaning can be performed thoroughly.
[0019]
Claim 8 The invention described in claim 6 Or 7 The cleaning apparatus according to claim 1, further comprising a steam generation chamber and a cleaning liquid storage chamber, a flow path system for guiding the cleaning liquid in the cleaning liquid storage section to the steam generation chamber, generating steam, and guiding the generated steam into the cleaning chamber; And a flow path system for condensing the steam generated in the steam generation chamber and guiding it to the cleaning liquid storage chamber, and leading the cleaning liquid from the cleaning liquid storage chamber to the shower liquid supply means and the cleaning liquid supply means. According to this cleaning apparatus, since the cleaning liquid can be cleaned without moving to another tank or the like, the cleaning time can be arbitrarily set, and the honeycomb core having a relatively large object to be cleaned can be cleaned. In addition, the amount of cleaning agent used can be reduced, and the peripheral facilities and management costs can be reduced.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a cross-sectional view showing a configuration of a cleaning apparatus main body 1 for carrying out this cleaning method. The cleaning device main body 1 is first provided with an opening / closing door 2 through which the object to be cleaned is carried in and out and the cleaning chamber 4 is sealed and opened. The cleaning chamber 4 has a double outer wall, and a cleaning liquid vapor passage 3 is provided between the two outer walls. The steam passage 3 is provided as a temperature adjusting means that heats the inside of the cleaning chamber 4 with the heat of the steam and prevents the heat escape from the inside of the cleaning chamber 4, that is, the heat dissipation, and constitutes the cleaning chamber 4 having a high heat retaining effect. ing. Heating and temperature control inside the cleaning chamber 4 can be performed by a steam heater (not shown) as temperature adjusting means.
[0022]
Further, the cleaning chamber 4 is provided with a steam supply port 5 as a cleaning solution vapor supply means so that the cleaning solution steam heated to 70 to 85 ° C. is supplied into the cleaning chamber 4. Further, the cleaning chamber 4 is provided with a vacuum exhaust port 6 as a vacuum suction means so that the inside of the cleaning chamber 4 is evacuated and kept at a constant pressure.
[0023]
In the cleaning chamber 4, a guide roller 8 and a swing cylinder 9 as a swing means are provided. The guide roller 8 is for carrying the carrying container 7 carrying the object 15 to be carried in and out through the open / close door 2, and the swing cylinder 9 swings the carrying container 7, that is, the object 15 to be washed is moved. It is intended to enhance the cleaning effect by swinging.
[0024]
Further, in the cleaning chamber 4, a shower nozzle 10 which is a shower liquid supply means for supplying a shower liquid used for finishing cleaning is provided at the lower part of the transfer container installation portion. In the present embodiment, the shower nozzle 10 is a full cone nozzle with the vertical direction of the cleaning chamber 4 as the central direction. For example, the shower nozzle 10 has a substantially uniform flow density within an effective cleaning range of 3820 mm in length and 1600 mm in width. Nozzle is arranged. A nozzle other than the full cone nozzle can also be used.
[0025]
Further, a drain pan 11 which is a cleaning liquid storage unit for storing the cleaning liquid is provided at the lower portion of the shower nozzle 10, and the upper portion 11 a of the drain pan 11 is opened. In the drain pan 11, an injection nozzle 12 which is an inert gas supply means for supplying an inert gas is provided. In the present embodiment, the injection nozzle 12 has a structure in which an inert gas is ejected from a perforation 12a provided in the upper direction of the pipe. For example, the cleaning liquid is on the upper side within an effective cleaning range of 3820 mm in length and 1600 mm in width. Are sprayed in the vertical direction by an inert gas. The cleaning liquid is supplied to the drain pan 11 from a cleaning liquid supply port 13 that is a cleaning liquid supply means, and is discharged from a cleaning liquid discharge port 14 that is a cleaning liquid discharge means. However, the cleaning liquid may be supplied using the shower nozzle 10. In the present embodiment, the spray nozzle for spraying the cleaning liquid with the inert gas is provided. However, a separate spray nozzle may be provided below the cleaning chamber 4 to spray the cleaning liquid upward. .
[0026]
FIG. 2 is a diagram showing an outline of the entire cleaning apparatus for carrying out this cleaning method. The steam supply port 5 of the cleaning apparatus main body 1 is connected to the steam generation chamber 22 via the steam passage 3 and the steam supply pipe 21. The steam generation chamber 22 also serves as a storage chamber for the used cleaning agent, and is also connected to the cleaning liquid discharge port 14 via the cleaning liquid discharge pipe 23. A steam heater 24 for heating the cleaning liquid and generating steam is provided at the lower part of the steam generation chamber 22. The steam heater 24 also performs heating and temperature control of the cleaning chamber 4 and the cleaning liquid storage chamber 25. It has become. A condensing tank 26 and a first condenser 27 corresponding to the first drain tank are connected to the steam generation chamber 22 so that only liquid that cannot be distilled and regenerated, such as dirt and moisture, can be concentrated. Is sent to the waste liquid tank 28.
[0027]
The steam generator 22 is connected to the cleaning liquid storage chamber 25 through the second condenser 29, and only the clean cleaning liquid that has been regenerated by distillation is stored in the cleaning liquid storage chamber 25. The cleaning liquid storage chamber 25 is connected to the shower nozzle 10 through the shower liquid supply pipe 30, and is connected to the cleaning liquid supply port 13 through the cleaning liquid supply pipe 31.
[0028]
The vacuum exhaust port 6 of the cleaning apparatus body 1 is connected to a vacuum pump 33 through a third condenser 32, and the outlet side of the vacuum pump 33 is further connected to a mist trap 34. The cleaning liquid condensed by the third condenser 32 is stored in the condensate tank 35 and returned to the steam generation chamber 22.
[0029]
By connecting the shower nozzle 10, the cleaning liquid storage chamber 25, the steam generation chamber 22, and the drain pan 11 as described above, the cleaning liquid can be cleaned without moving to another tank or the like. Can be set to In addition, even when cleaning a honeycomb core with a relatively large body to be cleaned, the amount of cleaning agent used is only 1500 liters and can be managed within the specified amount of third petroleum (2000 liters). Can be reduced. Furthermore, by providing the waste liquid tank 28 and the mist trap 33, it is possible to satisfy the requirements for environmental compatibility.
[0030]
Hereinafter, the cleaning method and operation will be described with reference to the process explanatory diagrams shown in FIGS. 1, 2, and 6.
[0031]
First, the object to be cleaned 15 is mounted on the transport container 7, the opening / closing door 2 of the cleaning apparatus main body 1 is opened, loaded along the guide roller 8 and placed in the center of the cleaning chamber 4, and then the opening / closing door 2 is closed. The cleaning chamber 4 is sealed. At this time, when cleaning the hexagonal cell type honeycomb core 41 with the plate material 42 bonded to one side as shown in FIG. 3 as the object 15 to be cleaned, it is placed in the basket 43 which is a transport container as shown in FIG. The honeycomb core 41 is accommodated with the open end facing downward, and the shower nozzle 10 is arranged so that the center direction of the shower nozzle 10 faces the cell axis direction of the honeycomb core 41. The reason why the cleaning is performed in the cleaning chamber 4 is that even if cleaning is performed using a normal paraffin cleaning liquid having a flash point of 70 ° C., there is no risk of fire and cleaning can be performed safely.
[0032]
Next, primary steam degreasing process S1 shown in FIG. 6 (1) is performed. In order to perform this primary vapor degreasing S1, first, the cleaning chamber 4 is vacuum-sucked through the vacuum exhaust port 6 by the vacuum pump 33, and the inside of the cleaning chamber 4 is set to 0.66 kPa or less. Next, the steam generation chamber 22 containing the normal paraffin cleaning liquid mainly composed of 11 to 12 carbon atoms is heated to 70 to 85 ° C. by the steam heater 24, and the generated steam is passed through the steam supply pipe 21 into the cleaning chamber 4. The object to be cleaned 15 is vapor degreased while being supplied and vacuumed to keep the pressure in the cleaning chamber 4 at 1.33 to 4.00 kPa.
[0033]
Here, the reason why the steam temperature is set in the range of 70 to 85 ° C. is to heat the cleaning target 15 to the cleaning temperature to a temperature sufficient to perform the steam degreasing, and in the cleaning chamber 4. The atmospheric pressure is set to 1.33 to 4.00 kPa in order to increase the vapor concentration and enhance the vapor degreasing effect as can be seen from the vapor pressure curve of the normal paraffin cleaning liquid used in the present embodiment shown in FIG. It is. By this primary steam degreasing S1, oil cleaning (machine oil, etc.), chips (cutting residue), adhesive, dust, etc. can be lifted to perform steam cleaning, and the object to be cleaned in the cleaning process 15 can contribute to the improvement of wettability.
[0034]
Next, cleaning process S2 is performed. In the cleaning step S2, the normal paraffin cleaning liquid is generally applied while vacuuming the inside of the cleaning chamber 4 to keep the temperature of the body 15 to be cleaned in the range of 0.27 to 4.00 kPa and in the range of 70 to 85 ° C. This is carried out by ejecting from below the cleaning body 15.
[0035]
The cleaning liquid is jetted out after the normal paraffin cleaning liquid is introduced into the drain pan 11 disposed in the lower part of the cleaning chamber 4 and then the cleaning liquid is boiled while maintaining the pressure in the cleaning chamber 4 within a range of 0.27 to 1.33 kPa. At least one of a boiling step S2a and an inert gas supply step S2b for feeding the inert gas into the cleaning liquid so that the cleaning liquid is pushed up while maintaining the atmospheric pressure in the cleaning chamber 4 in the range of 1.33 to 4.00 kPa. It is preferable that the cleaning liquid is sprayed from below the object to be cleaned 15 in one step.
[0036]
In the cleaning liquid boiling step S2a shown in FIG. 6 (2), the cleaning liquid in the cleaning liquid storage chamber 25 is supplied from the cleaning liquid supply port 13 to the drain pan 11, and then the temperature of the object to be cleaned 15 is controlled by the temperature control by the steam passage 3 or the heater. While maintaining at ˜85 ° C., vacuum suction is performed to maintain the atmospheric pressure in the cleaning chamber 4 in a range of 0.27 to 1.33 kPa, thereby causing a boiling phenomenon of the normal paraffin cleaning solution and spraying the cleaning solution. At this time, the transfer container 7 is swung by the swing cylinder 9 in order to enhance the cleaning effect.
[0037]
The temperature of the object to be cleaned 15 is maintained at 70 to 85 ° C. because the cleaning is insufficient when the temperature is less than 70 ° C., and the temperature is maintained at 85 ° C. or less when the honeycomb core having a plate material bonded to one side surface is cleaned. This is to prevent deterioration of the adhesive strength of the bonded portion between the core 41 and the plate material 42 and burning of the honeycomb core material. The reason why the air pressure in the cleaning chamber 4 is kept in the range of 0.27 to 1.33 kPa is that boiling is excessively less than 0.27 kPa, and stable cleaning with mist-like normal paraffin particles cannot be performed. This is because the boiling phenomenon cannot be caused when it exceeds 1.33 kPa (see FIG. 5).
[0038]
By the cleaning liquid boiling step S2a, the mist-like normal paraffin particles are scattered and blown up in multiple directions from the lower part of the object 15 to be cleaned, so that the object 15 having a complicated shape can be cleaned better than normal shower cleaning. In addition, since the mist-like normal paraffin particles are efficiently supplied to the inside of the body 15 to be cleaned, the body 15 to be cleaned and the liquid having a small heat capacity, in which the effect of general vapor degreasing cannot be expected so much. The to-be-cleaned object 15 which does not like immersion in the layer can be cleaned cleanly.
[0039]
In addition, if a bumping phenomenon is caused by using a clean cleaning liquid and a cleaning apparatus, the spray of cleaning liquid with a large kinetic energy is scattered in multiple directions. Can be done without.
[0040]
The inert gas supply step S2b supplies the cleaning liquid in the cleaning liquid storage chamber 25 from the cleaning liquid supply port 13 to the drain pan 11 until the injection nozzle 12 is sufficiently hidden, and then injects an inert gas such as nitrogen from the injection nozzle 12. Spray with cleaning solution. At this time, vacuum suction is performed to maintain the atmospheric pressure in the cleaning chamber 4 in the range of 1.33 to 4.00 kPa, and the temperature of the object to be cleaned 15 is maintained at 70 to 85 ° C. by temperature control using the vapor passage 3 or the heater. Further, the transfer container 7 is swung by the swing cylinder 9 in order to enhance the cleaning effect.
[0041]
The pressure in the cleaning chamber 4 is kept in the range of 1.33 to 4.00 kPa because the temperature in the cleaning chamber 4 is not uniform at 1.33 kPa or less and approaches the boiling point of the normal paraffin cleaning solution. This is to avoid this, and when it is 4.00 kPa or more, the normal paraffin cleaning liquid does not atomize and cleaning is not promoted. The inert gas is used to reduce the risk of fire by reducing the residual oxygen concentration.
[0042]
By the inert gas supply step S2b, the normal paraffin cleaning liquid is blown up vertically from the lower portion of the body 15 to be cleaned under a low pressure condition where the pressure in the cleaning chamber 4 is 1.33 to 4.00 kPa. In addition, cleaning with better directivity compared to ordinary shower cleaning is achieved, and by increasing the injection pressure, for example, even a thick honeycomb core can be cleaned. Further, since the mist-like normal paraffin particles are efficiently supplied to the inner part of the object 15 to be cleaned, immersion in the object 15 to be cleaned and the liquid layer having a small heat capacity, in which the effect of general vapor degreasing cannot be expected so much. The to-be-cleaned object 15 which is not so much can be cleaned cleanly.
[0043]
Next, a finishing cleaning step S3 and a secondary steam degreasing step S4 are performed. 6 (3) is performed by supplying clean cleaning liquid from the cleaning liquid storage chamber 25 to the shower nozzle 10 through the shower liquid supply pipe 30. At this time, the transfer container 7 is swung by the swing cylinder 9 in order to wash away the contaminated liquid adhering to the object 15 to be cleaned. By this step, a clean cleaning liquid is supplied from the lower part of the body 15 to be cleaned, so that sufficient finish cleaning can be performed.
[0044]
In the secondary steam degreasing step S4, the steam generated in the steam generation chamber 22 is supplied into the cleaning chamber 4 through the steam supply pipe 21, and vacuumed to keep the atmospheric pressure in the cleaning chamber 4 at 1.33 to 4.00 kPa. However, the object 15 to be cleaned is steam cleaned. Here, when the steam temperature is set in the range of 70 to 85 ° C. and the pressure in the cleaning chamber 4 is set to 1.33 to 4.00 kPa, the steam concentration is sufficiently increased to enhance the finishing degreasing effect and also to promote the drying. This is for the purpose of illustration. This step is particularly effective when cleaning an object to be cleaned that does not so much be immersed in the liquid layer.
[0045]
Further, by performing the secondary steam degreasing step S4 after the finishing cleaning step S3, the finishing cleaning can be performed thoroughly, and drying can be promoted.
[0046]
Finally, a drying step S5 shown in FIG. 6 (4) is performed. In this step S5, the pressure in the cleaning chamber 4 is set to a range of 1.33 kPa or less by the vacuum pump 33, and the temperature of the cleaning target 15 is controlled to a range of 70 to 85 ° C. by the steam passage 3 or the heater. 15 is performed by drying. The reason why the temperature of the object to be cleaned 15 is in the range of 70 to 85 ° C. is to dry within an acceptable time. The reason why the temperature is 85 ° C. or less is to prevent the honeycomb core 41 from being burned and This is to prevent deterioration of the bonding strength of the bonding portion between 41 and the plate material 42. After drying, the cleaning chamber 4 is opened to the atmosphere and the body 15 to be cleaned is carried out.
[0047]
Hereinafter, the case of cleaning the honeycomb core having the plate material bonded to one side surface will be described in detail.
A hexagonal cell type honeycomb core 41 (length 2300 mm, width 1400 mm, thickness 100 mm) with a plate 42 bonded to one side surface shown in FIG. 3 is connected to a stainless steel basket 43 (length 3700 mm, width 1700 mm, depth) shown in FIG. 150 mm), the open end of the honeycomb core 41 is accommodated downward, and the shower nozzle 10 is arranged so that the center direction of the shower nozzle 10 faces the cell axis direction of the honeycomb core 41.
[0048]
Next, the inside of the cleaning chamber 4 is vacuumed by the vacuum pump 33 and the pressure in the cleaning chamber 4 is set to 0.66 kPa or less, and then the steam generation chamber 22 containing the normal paraffin cleaning liquid is set to 70 to 85 by the steam heater 24. Heat to ° C. The generated steam is supplied into the cleaning chamber 4 through the steam supply pipe 21, and vacuum suction is performed to keep the atmospheric pressure in the cleaning chamber 4 at 1.33 to 4.00 kPa while steam degreasing the honeycomb core 41 for 10 to 15 minutes. .
[0049]
Next, after supplying the cleaning liquid in the cleaning liquid storage chamber 25 from the cleaning liquid supply port 13 to the drain pan 11 until the spray nozzle 12 is sufficiently hidden, the temperature of the honeycomb core 41 is maintained at 70 to 85 ° C. by temperature control with a heater. Vacuum cleaning is performed to keep the pressure in the cleaning chamber 4 within a range of 0.27 to 1.33 kPa, causing a boiling phenomenon of the normal paraffin cleaning solution and spraying the cleaning solution for 5 to 10 minutes. The basket 43 is rocked by the rocking cylinder 9.
[0050]
Further, nitrogen gas is injected from the injection nozzle 12 and the cleaning liquid is blown up for 5 to 10 minutes. At this time, vacuum suction is performed to keep the pressure in the cleaning chamber 4 within a range of 1.33 to 4.00 kPa, and the temperature of the honeycomb core 41 is kept at 70 to 85 ° C. by temperature control using a heater. Further, the basket 43 is rocked by the rocking cylinder 9.
[0051]
Next, a clean cleaning liquid is supplied from the cleaning liquid storage chamber 25 to the shower nozzle 10 through the shower liquid supply pipe 30 to perform final cleaning for 1 to 2 minutes. At this time, vacuum suction is performed to keep the pressure in the cleaning chamber 4 within a range of 1.33 to 4.00 kPa, and the temperature of the honeycomb core 41 is kept within a range of 70 to 85 ° C. by temperature control using a heater. Further, the basket 43 is rocked by the rocking cylinder 9. Further, the steam generated in the steam generation chamber 22 is supplied into the cleaning chamber 4 through the steam supply pipe 21 and is sucked in vacuum to maintain the atmospheric pressure in the cleaning chamber 4 at 1.33 to 4.00 kPa while maintaining the honeycomb core 41 at 10. Steam degrease for ~ 20 minutes.
[0052]
Finally, the air pressure in the cleaning chamber 4 is set to a range of 1.33 kPa or less by the vacuum pump 33, and the temperature of the honeycomb core 41 is controlled to a range of 70 to 85 ° C. by a heater, and dried for 15 minutes. After drying, the cleaning chamber 4 is opened to the atmosphere and the honeycomb core 41 is unloaded.
[0053]
The cleaning effect was confirmed for the hexagonal cell type honeycomb core 41 in which the plate material 42 was bonded to one side surface cleaned by the above steps. First, an ultraviolet irradiation inspection was conducted to investigate whether or not the mineral oil used at the time of cutting the honeycomb core remained, but no residue was detected. Further, when a node bond strength test (MIL-C-7438, required value 40 (lb / .625 in) or more), which is one of strength tests, was performed, a value of 60.2 (lb / .625 in) was obtained. Even when compared with 49.9 (lb / .625 in) by the trichlorethylene washing method, good results were obtained.
[0054]
Further, as shown in FIG. 7, an aluminum face plate 44 is bonded to the core open surface of the hexagonal cell type honeycomb core 41 with the plate material 42 bonded to one side surface using a 120 ° C. cured epoxy film adhesive, When the sandwich panel was assembled, sufficient adhesion strength and adhesion durability were secured, and a structure having high structural strength was obtained. Therefore, it was confirmed that the cleaning effect of the present invention is sufficient.
In addition, since the washing | cleaning method of this invention performs washing | cleaning in the range of 70-85 degreeC, it can wash | clean with confidence also the nonferrous metal which dislikes the burning by heat | fever, such as magnesium and titanium. Further, since the cleaning is performed with the mist-like cleaning liquid particles, the cleaning is not limited to the honeycomb core, and the cleaning target having a complicated shape or the target to be cleaned may be corroded due to immersion of the cleaning liquid. Furthermore, even when the honeycomb core is washed, the honeycomb core can be washed regardless of the cell shape and the cell size.
[0055]
【The invention's effect】
As described above, according to the cleaning method of the present invention, the temperature of the object to be cleaned is maintained in the temperature range of 70 ° C. to 85 ° C. throughout the cleaning and drying process. Even a honeycomb core in which a plate material is bonded to one side surface can be cleaned while preventing deterioration of the adhesive strength of the bonded portion between the honeycomb core and the plate material. In addition, since mist-like normal paraffin particles are efficiently supplied to the inner part of the object to be cleaned, even objects to be cleaned with a small heat capacity that cannot be expected to have the effect of general vapor degreasing hate to be immersed in the liquid layer. Even the object to be cleaned can achieve clean cleaning.
[0056]
Moreover, according to the cleaning apparatus of the present invention, the above-described cleaning method can be effectively carried out, and further, the cleaning liquid can be cleaned without moving to another tank or the like, so that the cleaning time can be arbitrarily set. In addition, it is possible to reduce the amount of cleaning agent used in cleaning a honeycomb core having a relatively large object to be cleaned, and to reduce peripheral facilities and management costs.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a cleaning apparatus main body used in an embodiment of the present invention.
FIG. 2 is a view similarly showing the configuration of the entire cleaning apparatus.
FIG. 3 is a diagram of a hexagonal cell type honeycomb core having a plate material bonded to one side surface.
FIG. 4 is a view of a transport container (basket) on which a honeycomb core is mounted.
FIG. 5 is a graph showing a vapor pressure curve of a normal paraffin cleaning agent used in the embodiment of the present invention.
FIG. 6 is a process explanatory diagram showing an outline of cleaning in the embodiment of the present invention.
Fig. 7 is a view of a honeycomb sandwich panel assembled by bonding a plate material to the other surface of a hexagonal cell type honeycomb core having a plate material bonded to one side surface.
[Explanation of symbols]
1 Cleaning device body
3 Steam passage
4 Washing room
5 Vapor supply port (cleaning liquid vapor supply means)
6 Vacuum exhaust port (vacuum suction means)
10 Shower nozzle (shower liquid supply means)
11 Drain pan (cleaning liquid storage part)
12 Inert gas injection nozzle (inert gas supply means)
13 Cleaning liquid supply port (cleaning liquid supply means)
14 Cleaning liquid outlet (cleaning liquid discharging means)
15 Object to be cleaned
22 Steam generation chamber
25 Cleaning liquid storage room
41 Honeycomb core
43 baskets

Claims (8)

A to-be-cleaned object arranging step for arranging the to-be-washed object in the cleaning chamber;
Cleaning in which the object to be cleaned is cleaned by ejecting a normal paraffin cleaning liquid from below while maintaining the pressure in the cleaning chamber in the range of 0.27 to 4.00 kPa and the temperature of the object to be cleaned in the range of 70 to 85 ° C. Process,
Wherein the cleaning chamber pressure in the range 1.33 kPa, and viewed including the step of drying the cleaning object while keeping the temperature in the range of 70 to 85 ° C. of the cleaning object, and
After the cleaning step introduces the normal paraffin cleaning liquid into the cleaning liquid storage unit disposed at the lower part of the cleaning chamber, the cleaning liquid boiling step of boiling the cleaning liquid while maintaining the atmospheric pressure in the cleaning chamber in the range of 0.27 to 1.33 kPa, At least one of the inert gas supply step of sending the inert gas into the cleaning liquid so that the cleaning liquid is pushed up while maintaining the atmospheric pressure in the cleaning chamber in the range of 1.33 to 4.00 kPa, to be cleaned A cleaning method characterized by being a step of cleaning a body to be cleaned by spraying a cleaning liquid from below the body .   The object to be cleaned is a honeycomb core alone or a honeycomb core in which a plate material is bonded to one side surface, and in the object to be cleaned arrangement step, the honeycomb core cells are arranged horizontally in the cleaning chamber with the open end facing downward. The cleaning method according to claim 1, wherein the cleaning method is characterized.   3. The cleaning method according to claim 1, wherein in the cleaning step, the object to be cleaned is swung horizontally. Between the cleaning object arranging step and the cleaning step,
A primary steam degreasing step is performed in which the vapor of the normal paraffin cleaning liquid in the temperature range of 70 to 85 ° C. is supplied into the cleaning chamber and the object to be cleaned is steam cleaned while maintaining the pressure in the cleaning chamber at 1.33 to 4.00 kPa. The washing | cleaning method of any one of Claims 1-3 characterized by the above-mentioned. Between the washing process and the drying process,
A finish cleaning process for supplying a shower liquid composed of a normal paraffin cleaning liquid from below the object to be cleaned to clean the object to be cleaned, and a pressure of 70 to 85 ° C. while maintaining the pressure in the cleaning chamber within a range of 1.33 to 4.00 kPa. and having a secondary vapor degreasing step of the cleaning object to vapor cleaning by supplying the vapor of normal paraffins cleaning liquid in the temperature range in the cleaning chamber, and according to any one of claims 1-4 Cleaning method. A sealable cleaning chamber in which the object to be cleaned is placed;
Cleaning liquid vapor supply means for supplying cleaning liquid vapor into the cleaning chamber;
Vacuum suction means for vacuum suction of the cleaning chamber;
Shower liquid supply means that is disposed in the lower part of the cleaning chamber and supplies shower liquid from below the object to be cleaned;
A cleaning liquid storage section disposed further below the shower liquid supply means of the cleaning chamber;
Cleaning liquid supply means for supplying a normal paraffin cleaning liquid to the cleaning liquid storage unit;
A cleaning liquid discharging means disposed at the bottom of the cleaning liquid storage section for discharging the cleaning liquid;
An inert gas supply means arranged in the cleaning liquid storage section to supply an inert gas into the cleaning chamber;
E Bei a cleaning compartment temperature adjusting means for adjusting the temperature of the wash chamber 70 to 85 ° C., the
The inert gas supply means cleans the object to be cleaned by spraying a cleaning liquid from below the object to be cleaned in a state where the pressure in the cleaning chamber is maintained within a range of 1.33 to 4.00 kPa by the vacuum suction means. In order to do so, an inert gas is sent into the cleaning liquid so that the cleaning liquid is pushed up . The cleaning apparatus according to claim 6 , further comprising a swinging unit configured to swing a body to be cleaned disposed in the cleaning chamber in a horizontal direction. Furthermore, a steam generation chamber and a cleaning liquid storage chamber are included, the cleaning liquid in the cleaning liquid storage unit is guided to the steam generation chamber to generate steam, and the generated steam is generated in the cleaning chamber. condensing the vapor obtained by guided in the cleaning liquid storage chamber, characterized in that it comprises a flow path system for guiding the cleaning liquid from the cleaning liquid storage chamber to the shower liquid supplying means and the cleaning liquid supply means, and according to claim 6 or 7 Cleaning equipment.

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