JPH08158080A - Cleaning work of metal or the like and device therefor - Google Patents

Abstract

PURPOSE: To provide a cleaning device unaffected by the initial setup even at the time of cleaning a metallic work of intricate shape, capable of perfectly cleaning the work with a small amt. of a cleaning soln. without polluting the environment and with the cleaning time shortened because of the line formation. CONSTITUTION: This device for cleaning a work of metal, etc., consists of a tank 1 filled with a cleaning soln. 5 and in which a work 3 of metal, etc., is dipped and showered, a tank 12 connected to the tank 1 and generating heated steam, a tank 2 for condensing the heated steam on the work 3 surface and then vaporizing a cleaning soln. 5a depositing on the work 3 with the reduced- pressure exhaust, a circulating pipeline 27 supplying the condensate in the tank 2 to a shower 6 in the tank 1, a pipeline 33 refining the soln. 5 in the tank 1 and supplying the refined soln. to the tank 12 and a cleaning soln. recovery device 10 provided to a reduced-pressure pipeline 7 for the reduced-pressure exhaust, and a recovery pipeline is extended from the device 10 to the pipeline 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning a processed material such as metal to which processing oil such as cutting oil, quenching oil and the like adhere.

[0002]

2. Description of the Related Art During the surface treatment of metal workpieces, for example, during heat treatment such as carburizing or nitriding of steel members, if machining oil such as cutting oil adheres to the surface, the atmosphere in the furnace is disturbed. In addition, due to other reasons, uniform and clean surface treatment is not performed, resulting in defective products. Further, it takes a lot of time to remove the quenching oil after the heat treatment.

Conventionally, as a method (and apparatus) for cleaning a work such as a metal as described above, a method of cleaning using water or steam, or water or steam containing a surfactant or an alkali, and further oil deposition A method of heating an object to be treated in a container, spraying a cleaning liquid mainly composed of water or water vapor into the container, and then depressurizing the inside of the container in a vacuum to vaporize and evaporate the adhering oil component (JP-A-3-140485). ) Is proposed.

In addition, a first step of vacuuming the inside of the cleaning tank containing the processed material, a second step of spraying an organic solvent liquid to the processed object in the cleaning tank in a shower shape, and the inside of the cleaning tank The step 3 of steam cleaning the workpiece and the step 4 of drying the workpiece by vacuuming the cleaning tank again are sequentially performed, and the first to fourth steps are repeated once or twice or more. The third
A method and an apparatus for heating the cleaning tank in the process (Japanese Patent Publication No. 5-77476, Japanese Patent Publication No. 6-11435, etc.) have been proposed.

[0005]

Even in the above-mentioned conventional method, a predetermined cleaning effect can be obtained.
The present invention enables complete cleaning even if the metal or the like to be cleaned has a complicated shape or is not affected by the setup condition, etc., and is economical and does not cause environmental pollution with a small amount of cleaning liquid. Moreover, it is an object of the present invention to provide a cleaning method and an apparatus therefor capable of shortening the cleaning time by forming a line.

[0006]

In order to achieve the above-mentioned object, the present invention adds dipping cleaning, which is the most basic and effective cleaning method, and enables further line-up. Cleaning such as complete oil removal is performed using a cleaning liquid with high cleanliness.

Specifically, the invention of claim 1 comprises an immersion cleaning step, a steam cleaning step and a vacuum drying step, wherein the cleaning liquid condensed on the surface of the workpiece such as metal in the steam cleaning step is collected and the immersion is performed. Shower between cleaning process and steam cleaning process
This is a method characterized by performing washing.

Further, the invention of claim 2 is characterized in that the cleaning liquid component vaporized in the steam cleaning process of the invention of claim 1 is replenished with a clean cleaning liquid obtained by regenerating the cleaning liquid of the immersion cleaning process. Is the way to do it.

According to a third aspect of the present invention, a dipping / shower washing tank in which a workpiece such as a metal is dipped and showered with a washing liquid, and a heating steam is connected under pressure to the dipping / shower washing tank under reduced pressure. A steam generation tank to be generated and the heated steam are condensed and liquefied on the surface of a workpiece such as metal, and then a steam cleaning / vacuum drying tank for evaporating the cleaning liquid adhering to the workpiece such as metal by decompression exhaust, and the steam cleaning / A recovery circulation circuit for supplying the condensate in the vacuum drying tank to the shower of the immersion / shower cleaning tank, and a regeneration purification line for regenerating and purifying the cleaning fluid in the immersion / shower cleaning tank and supplying it to the steam tank. A cleaning liquid recovery device provided in the decompression pipe for the decompression exhaust.

A fourth aspect of the present invention is an apparatus characterized in that a recovery pipeline is provided in the regeneration purification pipeline from the cleaning liquid recovery apparatus of the third aspect of the invention.

[0011]

In the present invention, the immersion cleaning is first performed. That is, the front door 4 is opened and the processed object 3 such as metal to which processing oil or the like is attached
Is an elevator (not shown) in the immersion / shower cleaning tank 1.
Supplied on. Next, the elevator is lowered and the processed material 3 such as metal is immersed in the cleaning liquid 5.

Incidentally, it is preferable that the cleaning liquid 5 is appropriately heated and the elevator is rocked if necessary. In this immersion cleaning, even if the processed product 3 such as metal has a complicated shape, the cleaning liquid 5 is brought into contact with the entire outer peripheral surface of the processed product 3 to remove a large amount of attached oil.

Next to this immersion cleaning step, in the present invention, shower cleaning is performed with a cleaning liquid having a high degree of cleanliness and condensed on the surface of a workpiece such as a metal in a steam cleaning step which will be described later.

That is, the pressure feed pump 30 is driven, and the cleaning liquid having a high degree of cleanliness, which is stored in the drain tank 24 in advance, passes through the open / close valve 28 and is cooled to about 50 ° C. by the oil cooler 29. It is supplied to the shower 6 through the opening / closing valve 31 and the opening / closing valve 31 to perform shower cleaning. By this shower washing step, the oil component that could not be washed off by the immersion washing step is further washed off.

Next, for the processed metal or the like that has been subjected to the shower cleaning step, the intermediate door 11 is opened and the in-tank transfer mechanism (not shown) is used.
Is transferred to the steam cleaning / vacuum drying tank 2.

During the transfer, the on-off valves 8 and 22 are opened in the illustrated embodiment, so that the dipping / shower cleaning tank 1 and the steam cleaning / vacuum drying tank 2 are opened via the pressure reducing pipe 7. The pressure is reduced to the same. However, it is also possible to transfer the processed metal or the like to the steam cleaning / vacuum drying tank 2 under atmospheric pressure, and after the transfer, reduce the pressure of the steam cleaning / vacuum drying tank 2.

After the processed material such as metal is transferred to the steam cleaning / vacuum drying tank 2 as described above, the intermediate door 11 is closed and the steam cleaning / vacuum drying tank 2 undergoes steam cleaning and then vacuum drying. Be seen. The steam in this steam cleaning is generated in the steam generation tank 12.

The steam generation tank 12 has an open / close valve 2
1 is opened and is always kept under reduced pressure, and the inside thereof is filled with a clean cleaning liquid 5a. The cleaning liquid 5a is supplied to the oil heater 13 by the circulation pump 15 via the opening / closing valve 39.
And is heated and held at 130 to 150 ° C.

The heating steam generated in the steam generating tank 12 enters the steam cleaning / vacuum drying tank 2 from the steam introducing valve 19 due to the difference in the steam pressure and the degree of vacuum between the steam cleaning / vacuum drying tank 2. be introduced.

The heating steam introduced into the steam cleaning / vacuum drying tank 2 is brought into contact with the surface of the cold work 3, such as a metal, which is transferred into the steam cleaning / vacuum drying tank 2 to be condensed. The process is performed until the temperature of the workpiece 3 such as metal is heated to the same as the temperature of the heated steam, and the heated steam is supplied from the steam generation tank 12 during that time.

In this steam cleaning, the cleaning liquid adhering to the workpiece 3 such as the metal in the shower cleaning step is washed off with the cleaning liquid 5a having the highest cleanliness. The cleaning liquid 5a condensed on the surface of the workpiece 3 such as the metal by the steam cleaning is stored in the drain tank 24 via the opening / closing valve 23,
It is supplied to the shower 6 through the recovery circulation pipe 27 and used for the shower cleaning.

At the same time, the regenerated purified cleaning fluid stored in the regeneration fluid tank 36 is transferred to the vapor generation tank 12 which has been vaporized and reduced by the above-mentioned vapor cleaning.
7, is supplied for each batch through the opening / closing valve 38, the circulation pump 15 and the oil heater 13 to be replenished.

When the steam cleaning step is completed, the steam introducing valve 19 is closed, the inside of the steam cleaning / vacuum drying tank 2 is vacuum-decompressed by the vacuum pump 9 through the opening / closing valve 22, and the steam cleaning / vacuum drying tank 2 adheres to the workpiece 3 such as metal. The cleaning liquid 5a is evaporated and dried.

The evaporative cleaning liquid 5a that accompanies the vacuum drying is captured by the cleaning liquid recovery device 10 provided in the decompression pipe line 7,
The opening / closing valve 40 is opened and the recovery purification line 46 supplies the regeneration purification line 33 with the steam generation tank 12 or the opening / closing valve 42 and the recovery circulation line 27 and supplies the shower 6 for reuse.

In the vacuum drying step, the steam passage 17 of the steam cleaning / vacuum drying tank 2 is filled with heating steam, and the inner shell 18 thereof has the same temperature as the heating steam. The cleaning liquid evaporated from the surface of the workpiece 3 such as metal does not re-condense and drip on the inner surface of the inner shell 18 and does not reattach to the workpiece 3 such as metal.
Does not cause poor drying.

After completion of the vacuum drying, the inside of the steam cleaning / vacuum drying tank 2 is returned to atmospheric pressure with atmospheric air or an inert gas, the outlet door 26 is opened and taken out, and transferred to the next heat treatment step or the like. .

Further, the cleaning liquid 5 in the immersion / shower cleaning tank 1 is sent to a cleaning liquid regeneration / purification device 35 via an opening / closing valve 34, and the cleaning liquid 5 having a high degree of contamination in the cleaning liquid regeneration / purification device 35. The contained oils and fats are separated and discharged from the waste oil discharge part 43, and the cleaning liquid having a high degree of cleanliness and regeneration is stored in the regeneration liquid tank 36 and is mainly supplied to the steam generation tank 12 to be used for the steam cleaning. To be done.

In the case of the other embodiment shown in FIG. 2, the washing and drying steps are substantially the same, and the washing cycle can be further shortened in this embodiment.

[0029]

DETAILED DESCRIPTION OF THE INVENTION The invention of the apparatus of one embodiment of the present invention will be described in detail below. FIG. 1 is a schematic circuit diagram of the apparatus, FIG. 2 is a schematic circuit diagram of the apparatus showing another embodiment, and FIG. 3 is a vertical cross section and a schematic circuit diagram of a steam cleaning / vacuum drying tank section.

In the figure, 1 is an immersion / shower cleaning tank,
2 is a steam cleaning connected to the soaking / shower cleaning tank 1
It is a vacuum drying tank.

The immersion / shower cleaning tank 1 has a front door 4 for feeding a workpiece 3 such as a metal of a workpiece, and a substantially lower half inside thereof is made of, for example, a hydrocarbon compound. Although not shown, an elevator is provided for immersing the workpiece 3 made of metal or the like, which is filled with the cleaning liquid 5 and sent from the front door 4, in the cleaning liquid 5.

In order to enhance the cleaning effect and shorten the cleaning time, a heating device for heating the cleaning liquid 5 to 50 ° C. or more is provided as necessary, and the elevator is configured to be swingable. It is preferable to rock the workpiece 3 such as a metal in the cleaning liquid.

Further, a shower 6 for shower cleaning, which will be described in detail later, is provided in the upper portion of the inside of the immersion / shower cleaning tank 1, and furthermore, a pressure reducing pipe 7 for reducing the pressure inside is provided with an opening / closing valve. It is connected through 8.

The depressurizing pipe line 7 is extendedly connected to a vacuum pump 9, and a cleaning liquid recovery device 10 described later, specifically, a water-cooled condenser or the like is provided on the way.

Next, the steam cleaning / vacuum drying tank 2 and the steam generating tank 12 connected to the immersion / shower cleaning tank 1 through the intermediate door 11 will be described.

First, the steam generating tank 12 will be described. The steam generating tank 12 is provided in the lower portion of the steam cleaning / vacuum drying tank 2, and an oil heater 13 is provided inside thereof.
The cleaning liquid 5a heated to 30 to 150 ° C. is filled. That is, in the illustrated embodiment, the oil heater 13
A circulation pipeline 14 is formed between the steam generation tank 12 and the steam generation tank 12, and a circulation pump 15 and an opening / closing valve 39 are provided in the circulation pipeline 14.

Next, the steam cleaning / vacuum drying tank 2 will be described. The steam cleaning / vacuum drying tank 2 is, as shown in FIG. 3, an outer shell 16 extended from an upper portion of the steam generating tank 12 and An inner shell 1 in which an outer space 16 is provided with a steam passage 17 at an appropriate interval to support the inner shell 1.
The inner shell 18 is provided with a steam introducing valve 19 in the upper portion of the inner shell 18. In the figure, 20 is an actuator of the steam introducing valve 19.

Further, the outer shell 16 is connected to the decompression pipe 7 for decompressing the inside of the steam passage 17 through an opening / closing valve 21, and the inner shell 18 is decompressed inside. The pressure-reducing pipe line 7 for switching is connected via an opening / closing valve 22.

Further, the bottom of the inner shell 18 is
It is connected to the drain tank 24 via the opening / closing valve 23. In the figure, 25 is a heat insulating material that covers the outside of the outer shell 16, and 26 is an outlet door.

Further, in the present invention, a recovery circulation pipe line 27 for supplying the condensate in the steam cleaning / vacuum drying tank 2 to the shower 6 of the immersion / shower cleaning tank 1 is constructed.

In the illustrated embodiment, the recovery circulation line 27 is
The drain valve 24 includes an opening / closing valve 23 and a drain tank 24.
It is composed of a wire 29, a pressure pump 30, and an opening / closing valve 31.

In the figure, 32 is a soaker / shower for dipping the condensate.
It is an opening / closing valve that is opened when replenishing it as the cleaning liquid 5 for immersion in the cleaning tank 1, and in that case, the opening / closing valve 31 is closed.

Further, in the present invention, the cleaning liquid 5 in the immersion / shower cleaning tank 1 is regenerated and purified so that the steam generating tank 1 can be obtained.
A regeneration and purification pipe 33 for supplying the water to 2 is constructed.

That is, the regeneration purification line 33 is provided with an opening / closing valve 34, a cleaning liquid regeneration purification device 35, a regeneration liquid tank 36, an opening / closing valve 3 from the bottom of the immersion / shower cleaning tank 1.
7. The circulation line 14 formed between the oil heater 13 and the steam generation tank 12 is connected to the suction side of the circulation pump 15 via the opening / closing valve 38.

Further, the cleaning liquid recovery device 10 is connected to the regeneration purification pipe 33 by a recovery pipe 46 via an opening / closing valve 40. In the figure, 41 is the cleaning liquid recovery device 1
It is an open / close valve that is closed when the cleaning liquid collected at 0 is supplied to the circulation pump 15 part constituting the regeneration purification pipe line 33.

Further, 42 is an opening / closing valve used when supplying the purified cleaning solution to the drain tank 24 leading to the immersion / shower cleaning tank 1 as necessary, 43
Is a discharge part of the waste oil separated by the cleaning liquid regeneration and purification device, 47
Is an on-off valve that is normally closed and opened for initial exhaust.

FIG. 2 shows another embodiment in which the steam cleaning / vacuum drying tank 2 is separated into a steam cleaning tank 2a and a vacuum drying tank 2b so that the cleaning cycle can be shortened. . In the figure, 44 is an intermediate door, and 45 is an opening / closing valve provided between the intermediate door and the pressure reducing conduit 7.

In the case of this embodiment, the vacuum drying tank 2b has a double jacket structure, and the inner wall is heated by passing a heating medium through the jacket to prevent the drying of the cleaning object due to the recondensation of the cleaning liquid. Can be prevented.

It has been confirmed that the present invention having the above-mentioned constitution can obtain a cleaning effect equivalent to or more than the case of using trichlorethylene even when a hydrocarbon-based cleaning liquid which does not cause environmental pollution is used. Is.

[0050]

According to the present invention, even in the case of a metal or the like having a complicated shape, complete cleaning can be performed without being affected by the setup condition, etc., and economical and environmental pollution with a small amount of cleaning liquid. There is no need to worry, and the effect of being able to shorten the cleaning time by using a line can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram of the device of the present invention.

FIG. 2 is a schematic circuit diagram of an apparatus showing another embodiment.

FIG. 3 is a vertical section and schematic circuit diagram of a steam cleaning / vacuum drying tank section.

[Explanation of symbols]

 1 Immersion / Shower Cleaning Tank 2 Steam Cleaning / Vacuum Drying Tank 3 Metallic Products 5 Cleaning Liquid 6 Shower 7 Decompression Pipeline 10 Cleaning Liquid Recovery Device 12 Steam Generation Tank 27 Recovery Circulation Circuit 33 Regeneration Purification Pipeline 46 Recovery Pipeline

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location C23G 5/04 (72) Inventor Riki Ishii 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd. Co., Ltd. (72) Inventor Shin Kurosawa 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd. (72) Inventor Yoshinori Harada 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd. (72) Inventor Kotobi Ebihara 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd.

Claims (4)

[Claims] 1. A dipping cleaning process, a steam cleaning process, and a vacuum drying process, wherein the cleaning liquid condensed on the surface of a workpiece such as a metal in the steam cleaning process is recovered to perform a shower between the immersion cleaning process and the steam cleaning process. A method for cleaning a processed material such as metal, which comprises performing cleaning. 2. The method of cleaning a metal or the like according to claim 1, wherein the cleaning liquid component vaporized in the steam cleaning process is replenished with a clean cleaning liquid obtained by regenerating the cleaning liquid in the immersion cleaning process. . 3. An immersion / shower cleaning tank in which a cleaning liquid is filled and a processed product such as metal is immersed and showered, and a steam generation tank which is connected to the immersion / shower cleaning tank and generates heating steam under reduced pressure. And a steam cleaning / vacuum drying tank for condensing and liquefying the heated steam on the surface of the processed material such as metal, and then evaporating the cleaning liquid adhering to the processed material such as metal by decompression exhaust, and condensation in the steam cleaning / vacuum drying tank. A recovery circulation line for supplying the liquid to the shower of the immersion / shower cleaning tank, a regeneration / purification line for regenerating and purifying the cleaning liquid of the immersion / shower cleaning tank to the steam generation tank, and the decompression. A cleaning device for a workpiece such as metal, comprising a cleaning liquid recovery device provided in a decompression pipe for exhaust. 4. The cleaning device for a workpiece such as metal according to claim 3, wherein a recovery pipe is provided from the cleaning liquid recovery device to the regeneration purification pipe.