JP2639772B2 - How to clean machine parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning various machined machine parts and for removing oil and impurities attached during machining.

[0002]

2. Description of the Related Art Conventionally, various machine parts have been manufactured and machined by machining such as cutting and drilling by a machine tool, and a predetermined machine has been manufactured. When machining machine parts, cutting oil is generally used, and the cutting oil adheres to the machined parts and metal powder such as cutting chips also adheres. It was necessary to remove the cutting oil, metal powder and other impurities adhered by washing.

[0003] Conventionally, cleaning of parts after such machining is as follows.
A chlorinated solvent such as trichloroethane or trichloroethylene or a solvent such as chlorofluorocarbon is used. However, chlor-based solvents are suspected of being carcinogenic, and the use of chlorofluorocarbon has been discontinued as a substance that destroys the global environment. Therefore, there has been a strong demand for cleaning means that can replace these solvents.

[0004]

SUMMARY OF THE INVENTION According to the present invention, cutting oil and impurities adhering to machine parts can be effectively removed without using a conventional chlorinated solvent or chlorofluorocarbon.
Moreover, the cleaning liquid to be adhered is reused without being discarded so that the resources can be effectively used.

[0005]

Means for Solving the Problems In order to solve the above problems, a means adopted by the present invention is to provide a cleaning method in which a machined machine part is first washed with washing oil and then with hot water. , An impurity removing circuit including an impurity removing device is provided in a first washing tank for washing machine parts with washing oil, and a part of the washing oil in the first washing tank is always circulated to the impurity removing circuit to remove metal powder and the like. Remove impurities and wash with oil
An impurity removing circuit including an impurity removing device and oil / water separating means is provided in a second washing tank for washing the separated mechanical parts with hot water, and a part of the hot water is constantly circulated to the impurity removing circuit to remove impurities.
It removes and separates the oil, and the impurity removing device of the first washing tank has a number of functions to keep the washing oil at NAS8 or higher cleanliness.
Receiving an impurity removal element made by laminating disc-shaped paper
Hold in the cartridge container while holding it between the pressure plate and the support plate.
And insert it freely into the main casing.
In addition, the lower surface of the cartridge
And packing action when clogged.
The filter paper is fixed, and the impurity removing device of the second cleaning tank has an impurity removing element in which a large number of cloths are stacked in layers to hold hot water at a cleanness of NAS class 8 or higher and absorb oil . Cutting oil is mixed in with cleaning and the concentration of cutting oil
Remove a portion of the oil in the first washing tank
Supply oil to the cutting oil and reduce it by removing a part of the oil.
It is characterized in that a small amount of fresh washing oil is supplied to the first washing tank.

[0006]

[Operation] The machined machine parts are washed with a washing oil containing a rust inhibitor, and then washed with warm water containing a rust inhibitor. The washing oil is always NAS (Nation
al Aerospace Standard) While suppressing it to the class 8 or higher, a part of it is mixed in the cutting oil to recirculate the cutting oil mixed in the washing oil. Wash oil, kerosene and or high flash point (70 ° C.) or more washing oil are suitable.
The hot water removes the oil mixed therein by the oil-water separation means. The temperature of the hot water is suitably about 45 ° C. In hot water, chemical oxygen consumption (COD) gradually increases with washing, but water with high COD increases the rust-preventive effect, and thus its function as a washing liquid is improved. As a result, the warm water for cleaning can be used endlessly without being discarded.

[0007]

According to the present invention, it is possible to clean a machined part without using a solvent such as a crawl system or chlorofluorocarbon, and to surely remove adhered impurities such as cutting oil and metal powder. Since it is not necessary to dispose of used washing oil and hot water, it is possible to effectively use resources and prevent waste.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. The drawings show the steps of the cleaning method according to the present invention. In the drawing, (1) denotes a first cleaning tank, which cleans machine parts using cleaning oil and removes attached cutting oil, metal powder, and the like. Reference numeral (2) denotes a second washing tank, which cleans the machine parts washed in the first washing tank (1) with hot water to remove oils and fats such as washing oil attached thereto. The machine parts cleaned in the first and second cleaning tanks (1) and (2) do not have fats and oils attached, and impurities such as metal powders are suppressed to a certain degree of contamination or less. When assembled on the machine,
In addition to eliminating the risk of malfunction or leakage of hydraulic oil due to the presence of foreign matter, the coating or printing of parts can be performed without any trouble because there is no oil or fat.

The oil for washing the machine parts in the first washing tank (1) is preferably kerosene or an oil having a flash point of 70 ° C. or more.
Gasoline and alcohol are not preferred because of their high flash points and problems with flame prevention. The washing oil in the first washing tank (1)
It is necessary to control the cleaning so that the number and size of the impurities contained are always kept below a certain level. It is desirable that the cleanliness of the washing oil be 8 or higher in the NAS class. This makes it possible to keep impurities adhering to the machine parts after cleaning to NAS class 8 or higher. If the cleanliness of the oil is less than NAS class 8,
The presence of impurities adhering to the cleaned machine parts may reduce the performance of the assembled machine or cause a leak.

The cleanliness of the washing oil in the first washing tank (1) is determined by NAS.
In order to maintain class 8 or higher, the first cleaning tank (1) is provided with an impurity removing circuit (3) including an impurity removing device (4), and the washing oil in the first cleaning tank (1) is Part of the circuit is always
It is circulated to (3) to remove impurities. In this manner, the cleaning oil in the first cleaning tank (1) can remove impurities in accordance with the speed at which the oil is contaminated by the cleaning. Can always be kept above a certain level. The present applicant has previously disclosed in Patent No. 154 the impurity removing device (3) incorporated in the circuit (4).
No. 3861, and the filtration device marketed under the name "Neflon.TM." Is suitable. As shown in FIGS. 2 to 4, the impurity removing device (4) composed of such a filtering device stacks a large number of papers in layers and passes the passages (6) around the center.
An impurity removing element (5) having a through hole is accommodated in a cylindrical main body casing (7).
The side wall is connected to an inflow pipe (8) of a circuit (3) for bypassing a part of the washing oil from the first washing tank (1). An extraction pipe (9) communicating with 6) is connected, and the other end of the extraction pipe (9) is communicated with the first cleaning tank (1). The impurity removing element (5) is formed by stacking a large number of thin papers such as tissue paper in a layered manner. Outflow to (6). The impurities contained in the hydraulic oil adhere to the paper fibers during the flow vortex in the layer gap, and are removed while remaining there. The impurity removing element (5) can remove impurities of 1 micron or more contained in the hydraulic oil.

A pressure receiving plate (10) is disposed on the upper surface of the impurity removing element (5), and pressurizes and compresses the impurity removing element (5) in accordance with the inflow pressure of the washing oil so that the impurity removing element is locally formed. To prevent crushing. The pressure receiving plate (10) preferably has a contaminated oil introduction hole (11) formed on the side wall at the center thereof.
A smaller-diameter air vent hole (12) is drilled to adjust the pressure applied to the impurity removing element (5), and to remove bubbles present in the washing oil to thereby remove the impurity removing element (5).
Make sure that millet does not flow through the inside.

The impurity removing element (5) is housed in a cartridge container (13) together with a pressure receiving plate (10) preferably disposed on the upper surface thereof, and can be taken out of the main casing (7). Before use, the cartridge container (13) has a can shape in which the upper and lower surfaces are sealed, and an opening means (15) for forming an opening (14) by tearing is provided on the upper surface, and an extraction pipe ( Lower surface opening (16) communicating with 9)
Is formed by piercing with a needle or the like at the time of use. Reference numeral (17) denotes a support plate for supporting the lower surface of the impurity removing element (5). A center hole (18) communicating with the passage (6) is formed at the center of the support plate (17). The impurity removing element (5) is held between the pressure receiving plate (10) and the support plate (17) by the stopper plug (20) that is implanted with (19) and fixed to the upper surface of the pressure receiving plate (10). You.
A filter paper (21) is fixed to the lower surface of the cartridge container (13), and is interposed between the filter paper (21) and the inner bottom surface of the main body casing (1). Add up. In the cartridge container (13), a required amount of new oil washing and rust preventive is stored in advance, and when the impurity removing element is replaced, a reduced amount of oil washing and rust inhibitor can be supplied. The impurity removing element (5) is most simply and appropriately prepared by the method of Patent No. 1484233 previously invented and disclosed by the present applicant, wherein a donut-shaped element is produced from raw paper by a rotating cutting means. Can be manufactured.

A required amount of a rust inhibitor is added to the washing oil in the first washing tank (1) to prevent rusting of mechanical parts and to remove impurities such as metal powder by the impurity removing device (4). And
The cleaning oil is maintained at NAS class 8 cleanliness. In addition, since the cutting oil adhering to the machine parts is mixed with the washing oil and gradually increases in concentration due to the washing in the first washing tank (1), the washing in which impurities are removed by the impurity removing device (4) is performed. A part of the oil is supplied into the cutting oil, the cutting oil is returned together with the washing oil, and fresh washing oil corresponding to the reduced volume is supplied to the first washing tank (1). As a result, waste of the cutting oil can be prevented, and the metabolism of the washing oil can be performed.

The machine parts washed in the first washing tank (1) cannot be painted or printed because the washing oil still adheres to them. Therefore, the second cleaning tank (2) of the present invention is washed with hot water to remove the adhering oil. As described above, by cleaning the mechanical parts in the two-stage cleaning process, it is possible to perform very good cleaning. The temperature of the hot water in the second washing tank (2) is preferably 45 ° C. or higher.
The cleanliness of class 8 or higher is maintained. Since hot water for washing is mixed with and dissolved in oil, it is not sufficient to simply remove impurities, and it is necessary to separate and remove the oil. For this reason, an impurity removing circuit (22) including the same impurity removing device (21) as used for the cleaning of the washing oil is installed in the second washing tank (2), and a part of the hot water is constantly circulated, While removing impurities, an oil-water separator (23) by gravity is installed in the second washing tank (2). The oil-water separation device (23) comprises an oil-water separation tank, and the second washing tank (2)
The oily supernatant liquid is taken out by a pump (24), oil and water are separated by gravity, and
It is returned to the washing tank (2). The separated oil at the top of the tank is discharged to an oil tank (25). The impurity removing element of the impurity removing device (21) is made of cloth.
The efficiency of oil removal and adsorption should be improved. Also, instead of oil-water separation by gravity, oil removal by centrifugal separation means or electrolysis may be performed, or these may be used in combination.

The hot water in the second cleaning tank (2) gradually becomes COD
Although water with high COD has a greater rust-preventive effect, it is rather useful as a cleaning solution of the present invention.
There is no need to discard. As a result, the water can be used substantially endlessly.

Next, the remaining amount of impurities in the second cleaning tank (2) from which impurities have been removed by the present invention is shown in the following table. The numerical values indicate the number of impurities in 500 l of the washing water. The grade indicates the NAS class.

[0017]

[Table 1]

As is clear from the above table, the second cleaning tank
It can be seen that the impurities in (2) gradually decrease with the number of days of removal (corresponding to the number of days of use). This allows
Machine parts washed with warm water in the second washing tank (2) include NA
It will be understood that no adherence of impurities of S class 8 or lower was observed, and a very good cleaning effect was exhibited.

[Brief description of the drawings]

Fig. 1 Principle explanatory view Fig. 2 Central longitudinal perspective view of impurity removing device Fig. 3 Vertical sectional view of cartridge container including impurity removing element Fig. 4 Exploded perspective view

[Explanation of symbols]

 (1) First cleaning tank (2) Second cleaning tank (3) Impurity removing circuit (4) Impurity removing device (5) Impurity removing element (6) Passage (7) Main casing (8) Inflow pipe (9) Discharge pipe (10) Pressure receiving plate (11) Contaminated oil introduction hole (12) Air vent hole (13) Cartridge container (14) Opening (15) Opening means (16) Bottom opening (17) Support plate (18) Central hole (19) Connecting rod (20) Stopper stopper (21) Impurity removal device (22) Impurity removal circuit (23) Oil / water separator (24) Pump (25) Oil tank

Claims (1)

(57) [Claims] 1. A cleaning method for cleaning a machined machine part first with a washing oil and then with a hot water, comprising an impurity removing device in a first washing tank for washing the machine part with a washing oil. An impurity removing circuit is provided, and a part of the washing oil in the first cleaning tank is constantly circulated through the impurity removing circuit to remove metal powder and the like.
Machine parts that have been cleaned with oil while removing impurities
Impregnator and oil / moisture in the second washing tank
And an impurity removing circuit including a separating means, and a part of the warm water is constantly circulated through the impurity removing circuit to remove impurities.
The oil is separated, and the impurity removing device of the first washing tank converts the washing oil into N.
A pressure-receiving plate and a support plate are used to form an impurity removing element in which a large number of disc-shaped papers having a cleanliness of AS8 or higher are laminated in layers.
While holding it in the cartridge container.
It is inserted into the thing so that it can be taken out freely, and the cartridge
On the lower surface of the container, the initial filtering action and the clogged state
When the filter paper has been fixed,
Cage, impurity removal device of the second cleaning vessel has an impurity removing elements stacked in layers multiple fabric to adsorb oil retain the hot water NAS8 grade or cleanness, switching with the washing
The first washing where the concentration of cutting oil has increased due to mixing of cutting oil
A part of the washing oil in the cleaning tank is taken out and supplied to the cutting oil, and the first washing tank is supplied with fresh washing oil corresponding to a reduced amount by taking out a part of the washing oil. A distinctive method of cleaning machine parts.