JPH08117703A - Cleaning method for oil-sticking material - Google Patents

Abstract

PURPOSE: To efficiently clean a work such as machined parts sticking oil content while the work is continuously conveyed. CONSTITUTION: A cleaning process is used in which at least a cleaning tank 2, a water washing tank 4 and a drying tank 5 are successively arranged. While a work sticking oil content is continuously moved in equal intervals by a conveyance line 8 installed in the upsides of the respective tanks 2, 4 and 5, the work is successively inserted into the respective tanks 2, 4 and 5. In the cleaning method, the residence time of the work in the respective tanks 2, 4 and 5 is specified and also at least one cleaning tank 1 is arranged in the front stage of the cleaning tank 2. The work is inserted into the cleaning tank 1, so that the residence time of the work therein is made the same as the residence time in the respective tanks 2, 4 and 5.

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 oily deposits, and more specifically, it is capable of efficiently cleaning workpieces such as machined parts having oily deposits while continuously conveying them. The present invention relates to a method of cleaning oil deposits that can be performed.

[0002]

2. Description of the Related Art Generally, various kinds of oils such as cutting oil, plastic working oil and heat treatment oil are used for machining machine parts. Therefore, these oils adhering to machined parts use organic solvents. And then washed away. So far,
The present inventors consider the problem of the safety of the organic solvent and the influence on the environment in washing the machined parts, and, for example, use a high boiling water-soluble organic solvent such as N-methyl-2-pyrrolidone and water. It has been proposed to use a cleaning agent as a main component (JP-A-6-170346, JP-A-6-2182,
(See Japanese Patent Laid-Open No. 6-184779).

A cleaning method using the above water-soluble organic solvent is disclosed, for example, in Japanese Patent Laid-Open No. 6-184779. First, the work is cleaned with water or hot steam to remove a part of the adhered oil. After that, precision cleaning is performed with a cleaning agent containing a water-soluble organic solvent and water as a main component, then the cleaning agent adhering to the work is removed again with water or hot steam, and the moisture is sprayed to remove water. It is performed in a process such as removal.

[0004]

By the way, rust preventive oils used during storage of metal materials and heat treated oils used in processing have a particularly high viscosity.
It is necessary to thoroughly clean with a cleaning agent. In the cleaning method using the above-mentioned cleaning device, in cleaning the work to which the high-viscosity oil adheres, the work is sequentially transferred with a fixed residence time, and therefore a cleaning process using a cleaning agent that requires the most processing time. Determines the overall processing speed, that is, the processing efficiency. In other words, in the cleaning using the above-mentioned transport method, particularly when cleaning a work to which high-viscosity oil adheres, while the cleaning process using the cleaning agent requires time, There is a problem that idle time increases and it is difficult to expect efficient cleaning. Therefore, an improved method for cleaning oily deposits is desired, which is capable of efficiently cleaning workpieces with oily components continuously conveyed.

[0005]

The present invention has been made in view of the above circumstances, and its gist is to use a washing process in which at least a washing tank, a water washing tank, and a drying tank are sequentially arranged, In addition, in a cleaning method in which a work line with oil content is continuously moved at equal intervals and sequentially inserted into each tank by a transfer line installed above each tank, the residence time of the work in each tank is constant. In addition, at least one cleaning tank is arranged in front of the cleaning tank, and the work is inserted into the cleaning tank such that the residence time of the work is the same as the residence time in each tank. It depends on how to clean the kimono.

The cleaning method of the present invention will be described in detail below. FIG. 1 is an explanatory view showing an example of a cleaning apparatus for carrying out the cleaning method of the present invention. First, such a cleaning apparatus will be described.

[0007] The illustrated apparatus is generally cleaned, for example, two cleaning tanks (1) and (2) containing a specific cleaning agent, and a rinsing water rinsing tank (4) containing, for example, water. And a drying tank (5) for spraying a gas onto the workpiece are sequentially arranged, and these cleaning tanks (1), (2),
A transfer line (8) is installed above the washing tank (4) and the drying tank (5), and the transfer line (8) is
A certain retention time is provided in the cleaning tanks (1), (2), the water cleaning tank (4), and the drying tank (5) while suspending the work to be cleaned at equal intervals and moving in one direction. It is designed to be inserted sequentially.

Specifically, the cleaning tank (1) is a liquid storage chamber (1c) for storing a cleaning agent and dipping and cleaning a work.
And a separation chamber (1a) that supplies a cleaning agent (6), which overflows from the storage tank and contains a large amount of oil, to a recovery tank (6) described later. In the liquid storage chamber (1a), a heater (11) for raising the temperature of the cleaning agent to a temperature suitable for cleaning is usually used, and an explosion for physically impacting the immersed work to enhance the oil separation effect. An air device (12) is attached. Also, 2
Like the cleaning tank (1), the second cleaning tank (2) is composed of a liquid storage chamber (2c) and a separation chamber (2a).
A heater (21) for raising the temperature of the cleaning agent and an explosive device (22) for giving an impact to the work are attached to a).

A gas blow tank (3) is usually installed between the cleaning tank (2) and the water cleaning tank (4) in order to remove the cleaning agent adhering to the work. A gas blow pipe (31) equipped with a large number of spray nozzles is arranged on the inner peripheral wall of the gas blow tank (3) so that an inert gas such as air or nitrogen is blown onto the surface of the work inserted in the gas blow tank. Has been done.

The water washing tank (4) is, for example, a tank for storing water and dipping and cleaning the work, and the cleaning agent remaining on the surface of the work is removed to perform the final cleaning. A heater (41) for maintaining a water temperature suitable for cleaning and an explosive device (42) for promoting cleaning are attached to the water washing tank (4). Note that the water washing tank (4) may be replaced with a structure for storing water for immersion cleaning, and a structure for spraying hot steam onto the inserted work to perform cleaning.

The drying tank (5) is constructed in substantially the same manner as the gas blowing tank (3) described above, and a gas blowing pipe (51) having a large number of spray nozzles is arranged on the inner peripheral wall thereof. The gas blow pipe (51) has a function of blowing away the water remaining on the surface of the work inserted in the drying tank (5) and drying the work.

A cleaning agent is supplied to the cleaning tanks (1) and (2) through a recovery tank (6). The recovery tank (6) includes a liquid storage chamber (6c) for storing the cleaning liquid, and
It consists of two chambers, a separation chamber (6a) for separating the cleaning liquid and the oil,
Moreover, the lower part of each chamber is continuous, and the separation chamber (6
Only the cleaning agent from which the oil has been separated in a) flows into the liquid storage chamber (6c). The cleaning agent in the liquid storage chamber (6c) is pumped (98c), flow channels (99) and (9).
It is supplied to the washing tanks (1) and (2) via 8).

In the separation chamber (1a) of the cleaning tank (1), the cleaning agent containing a large amount of oil recovered in the separation chamber (2a) of the cleaning tank (2), and the gas blow tank (3). The recovered cleaning agent is introduced into the separation chamber (6a) of the recovery tank (6) through the flow paths (93), (94) and (95), respectively. In addition, in the liquid storage chamber (6c) of the recovery tank (6), a cleaning agent having a high water-soluble organic solvent concentration, which will be described later, based on the concentration of the cleaning solution in the recovery tank (6) is also supplied via A cleaning agent having a low concentration of the organic solvent is supplied through the line (91).

Further, a pipe line (92) for water supply is attached to the washing tank (4) so that the water level of the washing tank (4) can be appropriately maintained. The washing tank (4) and the recovery tank (6) are connected via the flow path (96), the water storage tank (7) and the flow path (97), and the cleaning of the recovery tank (6) depends on the concentration. It is designed so that the agent can be diluted.

The transfer line (8) is, for example, a large number of buckets in a trolley stretched along the tanks (1) to (5) above the cleaning tanks (1) arranged in sequence. It has a structure in which (10), (10), ... Are suspended at equal intervals (arrangement interval of each tank) via a hoisting machine. Each bucket (10), (10) ... Is used to accommodate a relatively small work piece. The transfer tank line (8) sequentially moves the buckets (10), (10), ... In the arrangement direction of the cleaning tank (1) and the drying tank (5). Moreover, when it is located above each tank, it is stopped for a certain period of time, and while stopped, the buckets (10), (10) ... insert.

Next, the cleaning method of the present invention using the cleaning apparatus as described above will be explained. In the present invention, examples of the work to be cleaned include electronic parts, electrical parts, precision machine parts, machine parts, automobile parts, and jigs and tools used for processing them. Further, as the oil content attached to these workpieces, for example, in addition to cutting oil, rolling oil, press oil, drawing oil, plastic working oil such as forging oil, quenching oil, tempering oil, bright quenching oil, etc. Although the heat-treated oil of 1 is mentioned, the cleaning method of the present invention is particularly suitable for removing highly viscous oil.

In the cleaning method of the present invention, first, the work is inserted into the cleaning tank (1) and cleaned with a specific cleaning agent. That is, as the cleaning agent contained in the cleaning tank (1), 2-pyrrolidone, 3-pyrrolidone, N-alkyl-2-pyrrolidone (for example, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2
-Pyrrolidone), 5-alkyl-2pyrrolidone (for example, 5-methyl-2pyrrolidone, 5-ethyl-2pyrrolidone, 5-propyl-2pyrrolidone), N-vinyl-2.
-Pyrrolidones such as N-alkyl-3-pyrrolidone (for example, N-methyl-3-pyrrolidone, N-ethyl-3-pyrrolidone, N-propyl-3-pyrrolidone), γ-butyrolactone, N, N- A mixture containing at least one selected from dimethylacetamide and alkylene glycol alkyl ether, butanediol, 3-methoxy-3-methyl-1-butanol, hexylene glycol, diacetone alcohol and water is used. Of the pyrrolidones, N-methyl-2-pyrrolidone is particularly effective.

The above detergent may contain water at a maximum of about 75% by weight, usually 10 to 75% by weight. For example, in the case of N-methyl-2-pyrrolidone or alkylene glycol alkyl ether, water is
It is suitable to contain 0 to 50% by weight, preferably 15 to 30% by weight. Further, in the case of 2-pyrrolidone or γ-butyrolactone, it is suitable to contain water in an amount of 35 to 75% by weight, preferably 35 to 60% by weight. Furthermore, in the case of N, N-dimethylacetamide, 2
It is suitable to contain 5 to 75% by weight, preferably 25 to 60% by weight. If the amount of water in the detergent as a mixture is larger than the above range, the degreasing effect is significantly reduced, and if it is less than the above range, the solubility of the oil component in the detergent is too high. However, it becomes difficult to separate the oil component after repeated use, resulting in a decrease in detergency. The mixture having the composition within the above range does not need to be handled as a dangerous substance because it does not catch fire.

The first step of the present invention is cleaning in the cleaning tank (1). In the cleaning tank (1), the temperature of the cleaning agent stored in the liquid storage chamber (1c) is about 20 to 100 ° C., preferably 40 to 80, by operating the heater (11).
Hold at ° C. Then, the work is inserted into the liquid storage chamber (1c) and immersed in the cleaning agent for a certain period of time to substantially remove the oil content attached to the work. At that time, by operating the detonation device (12) to explode the air with an inert gas such as air or nitrogen, it is possible to give a shock to the immersed work and further enhance the cleaning effect.

In the present invention, by performing the same washing as above in the washing tank (2) as the second step, sufficient washing can be performed and unnecessary residence time is shortened in the subsequent steps. It is possible to improve the overall cleaning efficiency. In the washing tank (2),
The heater (21) keeps the cleaning agent at the same temperature as the cleaning tank (1), and activates the detonation device (22).
As in the cleaning tank (1), it is washed with an inert gas in an explosive atmosphere.

Then, as a third step, the works cleaned in the cleaning tanks (1) and (2) are inserted into the gas blow tank (3). In the gas blow tank (3), a gas blow pipe (31) is used, and an inert gas such as air or nitrogen is blown onto the surface of the inserted work to almost remove the attached cleaning agent.

Then, as a fourth step, the work is inserted into the water washing tank (4) to perform a final washing with water. The water stored in the water washing tank (4) is preheated to 20 to 100 ° C. using the heater (41). Further, in cleaning, the cleaning agent remaining on the surface of the work can be efficiently removed by using the detonation device (42) to explode with an inert gas such as air or nitrogen.

In the above-mentioned fourth step, cleaning with hot steam can be performed instead of water cleaning. When using hot steam, the cleaning agent remaining on the surface of the work is removed by blowing hot steam onto the work.
The temperature of hot steam is 90 ° C. or higher, preferably 100 to 1
It is set to 30 ° C. The amount of hot steam sprayed is, for example, about 1 kg / min for a surface area of 1 m 2 of the work. When such hot-steam cleaning is performed, the amount of water used can be reduced and wastewater treatment can be reduced as compared with water cleaning.

Next, as a fifth step, the work washed with water is inserted into the drying tank (5) to drain and dry.
In the drying tank (5), an inert gas such as air or nitrogen is blown from the gas blow pipe (51) onto the work surface,
Then, the water remaining on the surface of the work is blown off and dried. At that time, by blowing a gas such as dry air, it is possible to dry more quickly.

As described above, according to the cleaning method of the present invention, the work with oil adhered thereto is housed in the buckets (10), (10) ... And suspended at equal intervals in the transfer line (8). While moving (10), (10), etc. in one direction, these buckets are accumulated in the cleaning tanks (1), (2), the gas blow tank (3), the water washing tank (4) and the drying tank (5) to a certain extent. Multiple times (for example, twice) with a water-soluble organic solvent and a cleaning agent containing water as the main component, by inserting them sequentially with a certain time interval.
After performing the washing in (1), washing with water or hot steam is performed, and then a gas is blown to dry.

That is, in the present invention, since the cleaning using the above-mentioned specific cleaning agent is carried out in a plurality of steps, a sufficient cleaning effect can be obtained even for a work to which oil having a particularly high viscosity is attached. I can. Moreover, in the so-called tact conveyance in which the works are sequentially transferred, the overall processing speed is not reduced by the cleaning process with the cleaning agent, and efficient processing is possible. In other words, since the work can be moved according to a process having a relatively short treatment time such as a water washing process or a drying process, idle time in the water washing process or the drying process can be reduced and the work efficiency can be improved. It can be processed. In addition, the cleaning process using a cleaning agent, that is, the cleaning level can be easily changed simply by adding a cleaning tank at the upstream side on the upstream side in the conveying direction. There is no invitation.

In the present invention, the cleaning tanks (1), (2)
Also, in the water washing tank (4), in addition to the immersion method as shown in the figure, ultrasonic cleaning method or rocking method can be used together.
Further, a spray method or the like can be adopted instead of the dipping method. Also, when cleaning a relatively large workpiece,
Such a work is directly suspended on the transfer line (8) without using the bucket (10).

[0028]

EXAMPLES The present invention will be described below with reference to Examples and Comparative Examples. The cleaning apparatus shown in FIG. 1 was used for carrying out the present invention.

Example 1 Cutting oil (Aqueous cutting oil manufactured by Yushiro Kagaku: Yushiroken EC
-400) attached test piece (Material: SS-2
0, size: 2.98 cm x 4.98 cm x 0.3 cm (thickness) 20 buckets (10), (10) shown in FIG.
Was immersed in the cleaning tank (1) for 2 minutes and in the cleaning tank (2) for 2 minutes. The cleaning agent is a mixture in which N-methyl-pyrrolidone (NMP) and water as main components are mixed at a ratio of about 85:15 (weight ratio). Then, 20 ° C. air was blown onto the test piece for 2 minutes in the gas blow tank (3), immersion washing was performed for 2 minutes using 80 ° C. water in the washing tank (4), and 90 ° C. hot air in the drying tank (5). Was sprayed for 2 minutes for draining and drying.

With respect to the test piece that had been subjected to the above-mentioned washing treatment, the washing result was evaluated by visual observation of the surface, adhesion of cellophane tape, and how dirty the white cloth was when wiped with a white cloth. The cutting oil was completely removed. In the above process, the time required per bucket was 13.5 minutes, and the processing speed was 24 per hour.

Examples 2 to 4 As a detergent, γ-butyrolactone (GBL) and water as a main component were mixed at a ratio of about 65:35 (weight ratio) (Example 2), 2-pyrrolidone ( 2P) and water as the main components and these were mixed at a ratio of about 65:35 (weight ratio) (Example 3), N, N-dimethylacetamide (DMA) and water as the main components, and these were mixed at about 7
Using a mixture (Example 4) mixed at a ratio of 5:25 (weight ratio) and treating under the same conditions as in Example 1 except that the conditions were the same, the same evaluation as above was carried out. The same evaluation as in Example 1 was obtained. Of course, the processing speed is the same as in the first embodiment.

Comparative Example 1 In the step corresponding to the washing tank (1) of FIG. 1, after washing with water for 2 minutes, the same treatment as the steps after the washing tank (2) of Example 1 was carried out, When the same evaluation as above was performed, a slight amount of cutting oil was found on the surface of the test piece. Further, the adhesiveness of the cellophane tape was not good, and stains of the white cloth when wiped off with the white cloth were also confirmed. The processing capacity is the same as that of the first embodiment.

Comparative Example 2 Immersion cleaning was performed for 4 minutes with a cleaning agent in the step corresponding to the cleaning tank (1) in FIG. The cleaning agent is the same as in Example 1. Then, the gas blow tank (3), the water washing tank (4) and the drying tank (5) of Example 1 were treated by being retained for 4 minutes each in the same processing tank. Then, when the same treatment as described above was performed, the same evaluation as in Example 1 was obtained. However, the time required per bucket is 19
The processing speed was 13 units per hour.

[0034]

As described above, according to the cleaning method of the present invention, since a plurality of cleaning tanks are provided and the residence time of each tank is constant, the idle time of a process such as a washing tank or a drying tank, which requires a short time, is idle. It is possible to reduce the time, and it is possible to efficiently clean the work while oily work is continuously conveyed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a cleaning device for carrying out a cleaning method of the present invention.

[Explanation of symbols]

 1: Cleaning tank 2: Cleaning tank 3: Gas blow tank 4: Cleaning tank 5: Drying tank 6: Recovery tank 8: Transfer line 10: Bucket

Front Page Continuation (72) Inventor Toshihiro Iwamoto 4-12-12 Sendagaya, Shibuya-ku, Tokyo Within Sanryo Kasei Engineering Co., Ltd. (72) Inventor Motoki Nakajima 3-10-10 Shiodotsu, Kurashiki-shi, Okayama Mitsubishi Chemical Mizushima Plant Co., Ltd. (72) Inventor Atsushio Shimizu 28th-12th, Meieki, Nakamura-ku, Nagoya, Aichi Mitsubishi Chemical Corporation, Chubu Branch Office

Claims (2)

[Claims] 1. A washing process in which at least a washing tank, a water washing tank and a drying tank are sequentially arranged is used, and a work line on which oil is adhered is equally spaced by a transfer line installed above each tank. In a cleaning method of sequentially moving and sequentially inserting into each of the tanks, the retention time of the work in each of the tanks is made constant, and at least one cleaning tank is arranged in front of the cleaning tank to retain the work. A method for cleaning oil deposits, wherein a work is inserted into the cleaning tank at the same time as the residence time in each tank. 2. The method for cleaning oily deposits according to claim 1, wherein a cleaning agent mainly composed of a water-soluble organic solvent and water is used in each of the cleaning tanks.