JPH09314141A - Oil separator in pretreatment degreasing process in plating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exclude factors which cause deterioration in product quality by a method in which a lengthy pipe member one end of which is closed, and in which at a prescribed position in the longitudinal direction of an outer diameter surface, jet nozzle parts are formed at prescribed intervals is inserted into each of the both end opening parts of a joint member to be able to rotate. SOLUTION: A degreasing shower nozzle 18 is composed of a fitting 18c and shower pipes 18d, 18e. The fitting 18c which is hollow and T-shaped is equipped with rotary joints 18a, 18b which can rotate at an angle of 45 degree in the right and left end parts. In the shower pipes 18d, 18e, shower nozzles G are formed at regular intervals in the longitudinal direction of a lengthy pipe member one end of which is closed and the other end of which is opened. The open end parts of the shower pipes 18d, 18e are inserted into the both end open parts of the right and left rotary joints 18a, 18b of the fitting 18c, respectively. Besides, in the shower pipes 18d, 18e, the direction of the shower nozzles G is made adjustable from a horizontal position to about 45 degree upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separation device used in a degreasing process performed on a work as a pretreatment for plating.

[0002]

2. Description of the Related Art Plating refers to a method of coating with another metal and a formed metal coating layer in order to enhance the beauty, corrosion resistance and hardness of the metal surface. Gold, silver, platinum, brass alloys, etc. are mainly used for decoration plating, but chromium, nickel, etc. are plated for corrosion resistance and hardness, but iron plates are tinned. Tinplate plated with zinc and galvanized galvanized galvanized iron are known. The plating method includes an electroplating method, a hot dip plating method, a metal spraying method, and a vacuum plating method. These plating processing methods will be briefly described. The electroplating method is a method of plating an electric conductor by applying the principle of electrolysis, in which an electric circuit in which the metal to be plated is the cathode and the coating metal is the anode is immersed in an electrolyte solution of a salt solution to perform the plating treatment. Therefore, an insoluble anode such as lead or carbon may be used. As the coating metal,
Besides pure metals such as gold, lead, copper, nickel, zinc, tin, cobalt, cadmium, tungsten and molybdenum, alloys such as brass, bronze and nickel silver are also used. The hot dipping method is a method of immersing a metal to be plated in a molten metal, and zinc, tin, lead, cadmium, aluminum or the like having a relatively low melting point is used. Tin plate and tin plate are often made by this method. The metal spraying method is a method in which a molten metal is wiped with pressurized air. The vacuum plating method includes a metal vapor deposition method and a sputtering method. The metal vapor deposition method heats a metal in a vacuum and causes the vapor to adhere to another object. Plating aluminum or lead on plastic or glass is not recommended. This is an example. In sputtering, when a voltage is applied between electrodes in a vacuum, the residual gas is ionized and the cations collide with the cathode, causing the metal particles of the cathode to scatter, and these are attached to the target. Used as a non-conductive object plating base.

When the plating process is divided into process steps, five processes of polishing, pretreatment, plating, posttreatment, and drying are carried out. Of these, the processes that greatly affect the quality of the plated product are polishing and pretreatment. Is. This process varies depending on the product material, surface condition, shape, etc. For example, in the case of iron products, material, polishing, degreasing, washing, pickling, washing, neutralization, washing, activation, washing, plating, Take steps of washing with water and drying. Among these, in the polishing process, the surface of the product to be plated is polished with an abrasive to finish the surface suitable for plating. The polishing method includes grinder hanging, charcoal barbecue, spatula, brush, lapping, buff polishing, belt polishing, Rotational polishing, vibration polishing, etc. are common, but in some cases sandblasting,
Polishing using liquid honing, shot peening, electrolysis, chemical polishing, etc. is also performed. On the other hand, the pretreatment process is a process for removing stains such as grease, rust, and scratches on the product to make the surface most suitable for plating. Specifically, animal fats and oils attached to the surface of the work to be plated,
Degreasing organic and inorganic stains such as vegetable oils and mineral oils or stains of organic and inorganic mixtures by solvent degreasing, emulsion degreasing, alkaline degreasing, electrolytic degreasing, ultrasonic degreasing, mechanical degreasing, etc. However, these are briefly explained. Solvent degreasing is a method of dissolving and removing oily stains on a plating material using an organic solvent, and is performed as preliminary degreasing for washing oily stains that cannot be completely removed by washing with water.
As the degreasing solvent, gasoline, naphtha, petroleum, carbon tetrachloride, acetone, trichlor, ethylene, perchlorethylene, methylene chloride, etc. are used. Emulsification degreasing is a method of dissolving and emulsifying oily stains on a plating material by using an emulsion degreasing agent composed of a surfactant, a solvent and water, and this is also performed as preliminary degreasing for washing with water. As a solvent, kerosene or trichlene with a small amount of added surfactant is used. In alkaline degreasing, when a product to which a saponifying oil / fat is attached is dipped in an alkaline solvent, the alkali and the saponifying oil / fat are combined to form a water-soluble soap. In this method of saponifying fats and oils adhering to products by utilizing this saponification action, caustic soda, sodium carbonate, sodium silicate, sodium glycolate and the like are used as alkaline degreasing agents. Electrolytic degreasing is a method for removing a small amount of stains remaining on the surface of the product even in preliminary cleaning, and is performed after solvent degreasing, emulsion degreasing and alkaline degreasing. Ultrasonic degreasing is performed in combination with solvent degreasing, alkaline degreasing, and electrolytic degreasing to enhance the cleaning effect, and is often used for degreasing nonferrous metals such as zinc die cast and aluminum.

Next, a concrete degreasing process as a conventional technique will be described. The most rudimentary solvent degreaser is shown in Fig. 1.
As shown in FIG. 2, it is composed of a degreasing treatment tank 2 having an overflow portion 1 on the side surface that overflows from the water surface to the outside when a certain water level is exceeded, and an oil tank 3 provided immediately below the overflow portion 1. Then, in the degreasing treatment tank 2 inside this, a degreasing treatment aqueous solution A is introduced as a degreasing agent in which caustic soda (sodium hydroxide) and an activator are mixed. In this state, the work 4 coated with an oil / fat component such as an organic / inorganic substance or an organic / inorganic mixture such as an animal fat / oil oil, a vegetable fat / oil and a mineral oil / fat in a press working or a polishing process is placed inside the degreasing treatment tank 2. Throw in. Then, the fat / oil component B attached to the work 4 is separated from the work 4 as indicated by an arrow C by the degreasing effect of the degreasing treatment aqueous solution A, and floats to form the fat / oil layer D on the liquid surface. Therefore, the oil / fat layer D floating on the upper surface of the degreasing aqueous solution A is scraped out to the oil tank 3 through the overflow portion to be removed. However, in this method, when the degreasing treatment of the work 4 is repeatedly performed, the fat layer D separated from the work 4 is thickly deposited on the liquid surface of the degreasing treatment aqueous solution A, and the degreasing-treated work 4 is degreased. Oil component D accumulated on the liquid surface of the degreasing aqueous solution A when taken out from the tank
However, there was a drawback that they would reattach.

Therefore, a technique for eliminating this drawback has already been proposed. First, as shown in FIG. 2, it comprises a degreasing treatment tank 6 having an overflow portion 5 on its side surface and a filtration tank 7 provided directly below the overflow portion 5, and a pump 8 is provided from the bottom of the filtration tank 7. And the solution circulation pipe 10 is provided via the return valve 9. Then, the oil and fat layer formed on the liquid surface of the degreasing treatment aqueous solution A is discharged from the tip discharge port 10a of the solution circulation pipe 10 to the liquid surface of the degreasing treatment aqueous solution A stored in the degreasing treatment tank 6. Disperse and overflow part 5
It can be pushed out to. Secondly, as shown in FIG. 3, the middle point of the long pipe 11 having both ends closed is communicated with the tip of the solution circulation pipe 10, and a hole 11a is provided on the outer surface of the long pipe 11. Is the way. Then, by discharging from the hole 11a of the long pipe 11 to the liquid surface of the degreasing treatment solution A stored in the degreasing treatment tank 6, the oil layer formed on the liquid surface of the degreasing treatment solution A is discharged. It is said that they can be diffused and pushed out to the overflow section 5.

[0006]

However, in any of the above-mentioned conventional techniques, the circulating liquid is discharged so as to be hit from above onto the liquid surface of the degreasing treatment aqueous solution A stored in the degreasing treatment tank 6 in any method. Therefore, a large amount of bubbles E are generated from the liquid surface of the degreasing treatment aqueous solution A as shown in FIGS. 2 and 3. In this case, a large amount of bubbles E floating on the liquid surface of the degreasing-treated aqueous solution A are scattered by the airflow of the air conditioner or the ventilation fan in the factory and adhere to workers to deteriorate the work environment, There was a big problem that it adhered to the device and caused a failure. Furthermore, even if the oil / fat layer accumulated on the liquid surface of the degreasing-treated aqueous solution A is dispersed by the release of the circulating liquid, a large amount of the bubbles E floating on the liquid surface of the degreasing-treated aqueous solution A becomes a harmful effect. There is a fatal problem in the degreasing process such that the layer cannot be easily pushed out to the overflow portion 5, and when the degreased process work 4 is taken out from the degreasing process tank 6, the degreasing process aqueous solution A is exposed to the liquid surface. The current situation is that the drawback that the accumulated fat and oil components are reattached has not been eliminated. Therefore, the present invention has been made in order to solve the problems of these conventional techniques, and completes the pretreatment process in the plating process to remove the plating film after the plating process, the work and the plating film. Bubble formation between
In addition to eliminating factors that reduce product quality, such as reduced gloss and uneven plating, pinholes are suppressed to improve corrosion resistance, and a clean work environment is achieved in the plating factory. It aims to provide people-friendly technology.

[0007]

The present invention, which has been made to achieve the above object, is an apparatus used in a degreasing process performed as a pretreatment process for plating, and a predetermined degreasing agent is used at a constant concentration. Fill the degreasing aqueous solution melted in
A degreasing treatment tank in which a member to be degreased is placed to perform degreasing treatment, an inner portion of the degreasing treatment tank is provided with a degreasing aqueous solution discharging portion, and an opening is provided at a predetermined position on the upper surface of the body of the degreasing treatment tank. Provided, an overflow portion for removing the degreasing component floating on the water surface of the degreasing aqueous solution and the overflowing degreasing aqueous solution to the outside, and a degreasing aqueous solution mixed with the degreasing component discharged from the overflow portion provided near the lower part of the overflow portion. A degreasing component filtration tank for filtering, a circulation path for circulating the degreasing treatment aqueous solution filtered and discharged in the degreasing component filtration tank to the degreasing treatment solution discharge part of the degreasing treatment tank, and the circulation path is interposed. In the oil separation device in the pretreatment degreasing step of plating, which comprises a pump and a return valve arranged in parallel with the pump, the degreasing aqueous solution discharge part is A hollow short T-shaped joint member provided near the bottom of the water surface of the degreasing aqueous solution filled with a predetermined liquid level in the degreasing tank, and one end of each of the opening portions at both ends of the joint member is closed, An oil separation device in a pretreatment degreasing step of plating, characterized in that a long pipe member having a plurality of injection nozzle portions formed with a predetermined gap is rotatably inserted at a predetermined position in the longitudinal direction of the warp surface. Is the gist. In the degreasing aqueous solution discharge part, the direction of the injection nozzle part of the long pipe member inserted in the short T-shaped joint member is rotated from the horizontal position toward the position of about 45 degrees in the vertical direction toward the inside of the degreasing tank. It should be possible. It is preferable that the ejection liquid ejected from the ejection nozzle of the degreasing aqueous solution ejection part be controllable so that its tip always reaches the liquid surface of the degreasing aqueous solution.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 4 is a diagram (a) showing the internal structure of an oil separation device, which is an embodiment to which the oil separation device is applied in the pretreatment degreasing step of the plating process of the present invention, and an enlarged perspective view of the main parts of the oil separation device. The oil separator of this embodiment is shown in FIG.
As shown in (a), a degreasing tank 13 having an overflow portion 12 overflowing from the water surface to the outside when the water level exceeds a certain level, a degreasing treatment tank 13 provided directly below the overflow portion 12, and a plurality of partition plates F ( Actually, a large number of partition plates are provided, but the filter tank 14 is provided with three partition plates omitted for ease of illustration.
A solution circulation pipe 15 penetratingly connected to the inside of the degreasing tank 13 from the bottom of the filtration tank 14, a pump 16 installed in series with the solution circulation pipe 15, and a solution circulation pipe communicating with the pump 16. The degreasing shower nozzle 18 is detachably attached to the tip of a solution circulation pipe 15 that communicates with the degreasing treatment tank 13 and that communicates in parallel with the degreasing shower nozzle 18. Of these, the degreasing shower nozzle 18 is shown in FIG.
As shown in Fig. 5, the rotary joint 18a, which is hollow inside and has a T shape, is rotatable at both left and right ends at an angle of 45 degrees,
And a shower pipe 18d, 18e in which a plurality of shower nozzles G are formed with a constant gap in the longitudinal direction of a long pipe member having one end closed and the other end opened. There is. Then, connect the opening ends of the shower pipes 18d and 18e to the connection fitting 1
The left and right rotary joints 18a and 18b of 8c are respectively inserted into openings at both ends. Incidentally, the connection fitting 18c
In the shower pipes 18d and 18e connected to the left and right rotary joints 18a and 18b, the direction of the shower nozzle G is about 45 from the horizontal position as shown by the arrow.
It can be adjusted to around the degree.

The operation of this embodiment having the above structure will be described with reference to the drawings. First, a degreasing treatment aqueous solution A in which caustic soda (sodium hydroxide) and an activator are mixed is put into the degreasing treatment tank 13, the filtration tank 14, and the solution circulation pipe 15. Next, in the pressing or polishing process, the work is coated with the oil / fat component such as the organic / inorganic / organic / inorganic mixture such as animal fat, vegetable fat and mineral fat, and the fat component adhering to the work is removed. The oil and fat layer is formed so as to float on the liquid surface of the degreasing-treated aqueous solution. In this state, the pump 16 shown in FIG. 4A is driven to start the circulation operation of the degreasing treatment aqueous solution. Then
From the degreasing shower nozzle 18 provided inside the degreasing treatment tank 13, as shown in FIG. 5, the degreasing treatment aqueous solution is horizontally ejected as shown by an arrow H1. Therefore, the connection fitting 18c
When the shower pipes 18d and 18e connected to the left and right rotary joints 18a and 18b are arbitrarily rotated to direct the shower nozzle G to the position of arrow H2, for example, the degreasing treatment aqueous solution jetted from the degreasing shower nozzle 18 is , As shown by the arrow H3, the water surface is pushed up and the jetting is performed while drawing a parabola. At this time, if the return valve 17 is adjusted, the arrival position of the injection liquid from the degreasing shower nozzle 18 can be arbitrarily changed to be far or near. Therefore, by selecting the most effective diameter of the shower nozzle G or adjusting the spraying position of the shower nozzle G to the optimum position, no bubbles are generated in any degreasing treatment tank of any scale. In this state, the unnecessary oil and fat layer can be easily pushed out to the overflow section 12. Due to this action, the oil separation apparatus of this embodiment succeeded in obtaining various effects as shown below. As a complete pretreatment process in the plating process,
We succeeded in eliminating factors that deteriorate product quality, such as peeling of the plating film after plating, generation of bubbles between the work and the plating film, deterioration of gloss, and uneven plating. By completing the pretreatment process in the plating process, we succeeded in suppressing pinholes and improving corrosion resistance. By eliminating the presence of bubbles that occur in large quantities on the liquid surface of the degreasing aqueous solution, which was indispensable for conventional oil separators, it has become possible to keep the factory clean. Even if the air conditioner or ventilation fan is used frequently, it does not generate bubbles like the conventional oil separator, so it does not scatter and adhere to workers or to peripheral equipment, causing a failure. It was The oil and fat layer floating on the liquid surface of the degreasing treatment aqueous solution A in the degreasing treatment tank 13 is effectively diffused and the overflow portion 12
Since it can be easily pushed out, the oil and fat component does not redeposit when the work being degreased is taken out from the degreasing tank 13. By completing the pretreatment process in the plating process, there is no reduction in the product quality that occurs in the product after the plating process, and many defective products are generated in the product being produced, which is cost effective for the plating industry. There is almost no big damage to the.

The oil separation device in the pretreatment degreasing step of the plating process of the present invention is not limited to the oil separation device of the above embodiment, and various variations applying the technical idea of the present invention are conceivable. . For example, a servomotor and an actuator are attached to the left and right rotary joints 18a and 18b of the degreasing shower nozzle 18 provided inside the degreasing treatment tank 13, and the shower nozzles G of the shower pipes 18d and 18e are provided according to an electric signal from the outside. It is possible to freely rotate the direction from the horizontal position up to about 45 degrees upward, and connect the return valve 17 as an electromagnetic valve to the microcomputer. Further, a sensor for sensing the water level of the degreasing aqueous solution A or the oil layer floating on the liquid surface is provided at a predetermined position inside the degreasing treatment tank 13, and the microcomputer is operated in response to a signal from this sensor. Shower pipe 18
It is also possible to apply it to a fully automatic oil separation device that feedback-controls the direction of the shower nozzle G of d and 18e and the opening degree of the return valve 17.

[0011]

As described above in detail, the oil separation device in the pretreatment and degreasing process of the plating process of the present invention is a device used in the degreasing process performed as the pretreatment process of the plating process, and has a predetermined degreasing process. A degreasing treatment tank that fills the degreasing treatment aqueous solution in which the agent is melted at a constant concentration and performs the degreasing treatment by inserting the member to be degreased, an inner wall portion of the degreasing treatment tank, and a degreasing treatment aqueous solution discharge unit provided at a predetermined position, An opening is provided at a predetermined position on the upper surface of the body part of the degreasing treatment tank, and an overflow part for removing the degreasing component floating on the water surface of the degreasing solution solution and the overflowing degreasing solution solution to the outside, and a part near the overflow part are provided near the overflow part. The degreasing component filtering tank for filtering the degreasing-treated aqueous solution in which the discharged degreasing components are mixed, and the degreasing-treated aqueous solution filtered and discharged in the degreasing component filtering tank A degreasing aqueous solution discharging part of an oil separation device in a pretreatment degreasing step of plating processing, which includes a circulation path for circulating to the oil-treating aqueous solution discharging part, a pump interposed in the circulation path, and a return valve arranged in parallel with the pump. Is a hollow short T-shaped joint member provided near the lower part of the water surface of the degreasing aqueous solution filled to a predetermined liquid level in the degreasing tank, and one end is closed at each of both end openings of the joint member, A long pipe member having a plurality of injection nozzle portions opened at predetermined gaps was rotatably inserted at a predetermined position in the longitudinal direction of the outer surface. Further, in the degreasing treatment aqueous solution discharging part, the direction of the injection nozzle part of the long pipe member inserted into the short T-shaped joint member is from the horizontal position toward the inside of the degreasing treatment tank to a position of about 45 degrees in the vertical direction. Made rotatable. Further, the jetting liquid discharged from the jetting nozzle of the degreasing aqueous solution discharging part can be controlled so that its tip always reaches the liquid surface of the degreasing aqueous solution, so that the pretreatment step in the plating step is completed. As a result, we succeeded in eliminating factors that deteriorate product quality, such as peeling of the plating film after plating, generation of bubbles between the work and the plating film, deterioration of gloss, and uneven plating. In addition, by completing the pretreatment process in the plating process, we succeeded in suppressing pinholes and improving corrosion resistance. Furthermore, by eliminating the presence of bubbles that occur in large quantities on the liquid surface of the degreasing aqueous solution, which was indispensable for conventional oil separation devices, it has become possible to keep the factory clean. Furthermore, even if an air conditioner or a ventilation fan is used frequently, it does not generate bubbles unlike the conventional oil separation device, and scatters and adheres to workers or to peripheral devices, causing a failure. Has disappeared. Furthermore, since the oil and fat layer floating on the liquid surface of the degreasing treatment solution in the degreasing treatment tank can be effectively diffused and easily pushed out to the overflow portion, the work being degreasing treatment can be removed from the degreasing treatment tank. The oil and fat component did not redeposit when taken out from the inside. Furthermore, by completing the pretreatment process in the plating process, there is no reduction in product quality that occurs in products after plating, and many defective products are produced in the products being produced, which can lead to the plating industry. There is almost no costly damage to. It is an epoch-making invention that succeeded in obtaining various effects such as, the technical effect on the industry is tremendous, and the benefit to the entire industry is immeasurable.

[Brief description of drawings]

FIG. 1 is an explanatory view of a specific degreasing process as a conventional technology of an oil separation device in the pretreatment degreasing process of the plating process of the present invention and the most basic solvent degreasing device.

FIG. 2 is an explanatory view of a general prior art of an oil separation device in a pretreatment degreasing step of plating processing of the present invention.

FIG. 3 is an explanatory view (a) and a plan view (b) of the internal structure of another conventional art of the oil separation device in the pretreatment degreasing step of the plating process of the present invention.

FIG. 4 is a diagram (a) showing the internal structure of the oil separation device that is an embodiment to which the oil separation device is applied in the pretreatment degreasing step of the plating process of the present invention, and an enlarged perspective view of the main parts of the oil separation device.

FIG. 5 is an operation explanatory view of an embodiment to which an oil separation device is applied in a pretreatment degreasing step of plating processing of the present invention.

[Explanation of symbols]

 1,5,12 Overflow part 2,6,13 Degreasing tank 3 Oil tank 4 Work 7,14 Filtration tank 8,16 Pump 9,17 Return valve 10,15 Solution circulation pipe 10a Tip discharge port 11 Long pipe 11a hole 18 shower nozzle 18a, 18b rotary joint 18c connection metal fittings 18d, 18e shower pipe A degreasing treatment solution B oil component D oil layer F partition plate G shower nozzle

Claims (3)

[Claims] 1. An apparatus used in a degreasing process performed as a pretreatment process for plating, which is filled with a degreasing treatment aqueous solution in which a predetermined degreasing agent is melted at a constant concentration, and a member to be degreased is put in to degrease. The degreasing treatment tank for performing the treatment, the degreasing treatment aqueous solution discharge part provided at a predetermined position on the inner wall portion of the degreasing treatment tank, and the opening on the water surface of the degreasing treatment aqueous solution are provided at predetermined positions on the upper surface of the body of the degreasing treatment tank. An overflow part for removing the floating degreasing component and the overflowing degreasing aqueous solution to the outside, and a degreasing component filter tank provided near the lower part of the overflowing part for filtering the degreasing aqueous solution mixed with the degreasing component discharged from the overflow part, A circulation path for circulating the degreasing aqueous solution filtered and discharged in the degreasing component filtering tank to the degreasing aqueous solution discharge part of the degreasing processing tank, and the circulation path In an oil separation device in a pretreatment degreasing process of plating, which comprises an interposed pump and a return valve arranged in parallel with the pump, the degreasing aqueous solution discharge part is filled with a predetermined liquid level in the degreasing treatment tank. The hollow short T-shaped joint member provided near the lower part of the water surface of the degreased aqueous solution thus prepared, and one end of each of the opening portions at both ends of the joint member are capped, and at a predetermined position in the longitudinal direction of the outer surface. An oil separation device in a pretreatment degreasing step of plating, wherein a long pipe member having a plurality of injection nozzle portions formed with a predetermined gap is rotatably inserted. 2. The degreasing treatment aqueous solution discharge part has a long pipe member inserted into a short T-shaped joint member in which the injection nozzle portion is oriented approximately 45 degrees vertically from the horizontal position toward the inside of the degreasing treatment tank. The oil separation device in the pretreatment degreasing step of the plating process according to claim 1, wherein the oil separation device is rotatable to the position. 3. The jet liquid ejected from the jet nozzle of the degreasing aqueous solution discharge unit is controllable so that its tip always reaches the liquid surface of the degreasing aqueous solution. Oil separator in the pre-treatment degreasing process of the plating process of.