JPH06339668A - Drying of object to be cleaned and drying device therefor - Google Patents

Abstract

PURPOSE:To ensure that moisture is removed regardless of the shape complexity of an object to be cleaned by exposing an object to be cleaned to hot blast after water washing, then leaving the object exposed to a high pressurized air later or almost simul taneously, and further placing the object in an atmosphere of negative pressure in terms of a gauge pressure. CONSTITUTION:A work 1 such as a drilling machine or an end mill after water wash is set in a tank 2. Next, a hot blast at about 120 to 170 deg.C is generated using a hot blast drying machine 4, and is fed into the tank 2 from a nozzle 6 by opening a valve 9 so that the hot blast is blown to the work 1. Further, a valve 11 is opened almost simultaneously with the blowing of a hot blast, and a high pressure air of about 4 to 7-kg/cm<2> is introduced into the tank 2 through a compressed air feeder pipe 10 so that the air is blown to the work 1 from a nozzle 7. After that, the valves 9, 11, 14 are closed to activate a vacuum pump 5 and a valve 13 is opened to exhaust air from the tank 2 so that the air pressure in the tank 2 is 10Torr max. Consequently, the residual fine droplets, if any, on the surface of the work 1 are evaporated instantaneously to achieve the the compete drying of the work 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drying an object to be cleaned, and in particular, in the case of cleaning a cutting tool having a complicated shape such as a drill or an end mill, water-drying is performed without using CFC after the water-washing step. A method and apparatus.

[0002]

2. Description of the Related Art A manufacturing process of a cutting tool such as a drill or an end mill includes a working process using a grinding oil. , It is necessary to wash and remove this grinding oil before coating.

In general cleaning processes, degreasing cleaning, water cleaning,
Dehydration (draining) is sequentially performed, and finally a drying step is performed. In the past, the drying process was sometimes performed using CFCs, but in view of the social demand toward the abolition of CFCs, recently, a drying process using warm air or hot air has been adopted.

However, since cutting tools such as drills and end mills have a three-dimensionally undulating shape, only the above-described drying step using warm air or hot air may cause the depth of the recessed portion to be deep. It is difficult to completely dry the water that has entered into.

The present invention has been made in view of the above-mentioned conventional technical problems, and was devised to effectively solve the problems.
Therefore, the object of the present invention is to be able to reliably and completely dry the moisture that has entered deep inside the recess of the object to be cleaned having a complicated shape such as a drill or an end mill while adopting a drying process using warm air or hot air. It is to provide a drying method and an apparatus thereof.

[0006]

The method for drying an article to be cleaned according to the present invention has the following steps in order to solve the problems of the prior art as described above and to achieve the object. That is, after the washing step in cleaning, a hot air step of exposing the object to be cleaned to hot air, a high pressure air flow step of exposing the object to be cleaned to a jet of high pressure air, or a high pressure air flow step after the hot air step or at about the same time. After that, a vacuum step of placing the object to be cleaned in a negative pressure atmosphere at a gauge pressure is included.

Further, the vacuum step is preferably performed in an atmosphere having a vacuum degree of 10 Torr or less.

The apparatus for drying an article to be cleaned according to the present invention comprises a housing for accommodating the article to be cleaned and forming a chamber that is shielded from the outside air, and hot air for blowing hot air to the article to be cleaned contained in the housing. It is provided with a spraying means, a high-pressure airflow spraying means for spraying a high-pressure airstream onto the object to be cleaned, and a vacuum means for depressurizing the inside of the housing.

[0009]

In the drying method and the drying apparatus of the object to be cleaned according to the present invention, only the hot air step in which the hot air means blows the hot air to the object to be cleaned is almost the same as the hot air drying in the prior art. The state is obtained. The temperature of the object to be cleaned is about 40 ° C to 90 ° C. Further, in the high-pressure airflow step in which the high-pressure airflow blowing unit blows the high-pressure airflow onto the object to be cleaned, most of the water remaining in the recessed portion of the object to be cleaned is blown off. Then, in the vacuum step of decompressing the inside of the housing by the vacuum means, the boiling point of water in the housing is lowered, and even if there is residual water, the temperature of the object to be cleaned becomes about 40 ° C to 90 ° C. Therefore, the water is completely evaporated.

In particular, the boiling point of water is 1 atm (760 Torr)
The temperature is 100 ° C., but at 10 Torr, it drops to about 11 ° C., and even if there is residual water, that water reaches at least about 40 ° C., so it will surely evaporate.

As described above, in the atmosphere to which the object to be cleaned is finally exposed, the water evaporation effect due to the lowering of the atmospheric pressure is utilized, so that the water can be reliably removed regardless of the complexity of the shape of the object to be cleaned. To be done.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for drying an article to be cleaned and an apparatus therefor according to the present invention will be described below with reference to FIG. FIG. 1 is a schematic configuration diagram showing an entire apparatus for carrying out the drying method of the present invention. The work 1 such as a drill and an end mill after the water washing process is set in the tank 2.
The tank 2 is composed of a closed container covered with a heat insulating material 3, and is connected to a hot air generator 4 and a vacuum pump 5 provided outside, and a high pressure air source (not shown) such as a compressor. The hot air generator 4 has a fan (not shown) built therein.

Inside the tank 2, a plurality of nozzles 6 connected to the hot air generator 4 for blowing hot air onto the work 1 are provided, and similarly, a plurality of nozzles 7 for blowing high-speed high-pressure air onto the work 1 are provided. . Valve 9 for hot air supply pipe 8
However, the compressed air supply pipe 10 is provided with a valve 11, and the vacuum extraction pipe 12 is provided with a valve 13. Also,
An escape valve 14 for releasing hot air and high-pressure air in the tank 2 to the outside of the machine is attached to the bottom of the tank 2, and a leak valve 15 for taking in air into the vacuumed tank 2 is attached to the side wall of the tank 2. There is. In the figure, 16 is a pressure gauge and 17 is a vacuum gauge.

In the following description, all valves 9,
The operation starts from the state where 10, 11, 13, 14, and 15 are closed. After setting the work 1 in the tank 2, the hot air generator 4 generates hot air of 120 to 170 ° C., the valve 9 is opened, and the hot air is discharged from the nozzle 6 to the tank 2.
It is supplied inside and sprayed on the work 1.

Almost at the same time as the above hot air blowing, the valve 1
1 is opened, high pressure air of 4 to 7 kg / cm ² is introduced into the tank 2 through the compressed air supply pipe 10, and is sprayed from the nozzle 7 onto the work 1. The surface of the work 1 has a complicated shape,
Even if the water droplets are attached to a slightly complicated place, the water droplets are almost blown off by the strong air flow and vaporized in the high temperature air in the tank 2. When the pressure inside the tank 2 becomes high to some extent, the relief valve 14 is opened to allow the air in the tank to escape to the outside of the tank. In this way, when the supply of hot air and high-pressure air is continued for about 3 to 10 minutes, the temperature of the work 1 rises from 40 ° C to 90 ° C, and at the same time, most of the water droplets are blown off.

Subsequently, the valves 9, 11, and 14 are closed, the vacuum pump 5 is started, and the valve 13 is opened. The air in the tank 2 is discharged from the vacuum extraction pipe 12 through the vacuum pump 5 to the outside of the tank 2. When this operating state is continued for about 2 to 5 minutes, the atmospheric pressure in the tank 2 becomes 10 Torr or less. Since the temperature of the work 1 is 40 to 90 ° C., even if there are small water droplets remaining on the surface of the work 1, under the atmospheric pressure, the work 1 is almost instantly completely evaporated, and the work 1 Is completely dry.

Finally, the operation of the vacuum pump 5 is stopped, the valve 13 is closed, and the leak valve 15 is opened instead. Atmospheric pressure flows into the tank 2 to reach atmospheric pressure, the lid of the tank 2 is opened, and the work 1 is taken out.

In the above-described embodiment, the high-pressure air source is provided separately from the hot air generator 4, but it is also possible to connect a compressor to the hot air generator to supply high-pressure hot air into the tank. Is.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an entire apparatus for carrying out a drying method of the present invention.

[Explanation of symbols]

1 Work 2 Tank 3 Heat Insulating Material 4 Hot Air Generator 5 Vacuum Pump 6 Nozzle 7 Nozzle 8 Hot Air Supply Pipe 9 Valve 10 Compressed Air Supply Pipe 11 Valve 12 Vacuum Bleed Pipe 13 Valve 14 Relief Valve 15 Leak Valve 16 Pressure Gauge 17 Vacuum Gauge

Claims (3)

[Claims] 1. A hot-air step of exposing a body to be cleaned (1) to hot air after a washing step in washing, and exposing the body to be cleaned (1) to a jet of high-pressure air after the hot air step or at about the same time. A method for drying an article to be cleaned, comprising: a high-pressure air flow step; and a vacuum step of placing the article (1) to be cleaned in a negative pressure atmosphere at a gauge pressure after the high-pressure air flow step. 2. The method for drying an article to be cleaned according to claim 1, wherein the vacuum step is performed in an atmosphere having a vacuum degree of 10 Torr or less. 3. A housing (2) for accommodating an article to be cleaned (1) to form a room that is shielded from the outside air, and hot air to the article to be cleaned (1) contained in the housing (2). A hot-air blowing means (6) for blowing, a high-pressure air stream blowing means (7) for blowing a high-pressure air stream onto the object to be cleaned (1), and a vacuum means (5) for depressurizing the inside of the housing (2). A characteristic drying device for the object to be cleaned.