JP2000226699A - Method and device for surface treatment of metallic parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of suppressing the degradation of a treatment solution even when the installation space for a surface treatment device is small. SOLUTION: Metallic parts are surface-treated using a surface treatment device in which tanks 12 comprising a water cleaning tank to achieve the water cleaning, a treatment tank filled with the treatment solution, and a drying tank to achieve the drying. Immediately after the treatment with water or the treatment solution, the water or the treatment solution is removed. The water or the treatment solution in the previous process is less contained in the water or the treatment solution in the next process to suppress the degradation of the water or the treatment solution.

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 performing a surface treatment such as a chemical conversion treatment or a plating treatment on a metal part.

[0002]

2. Description of the Related Art In chemical treatment or plating of metal parts, pretreatment, rinsing, chemical treatment or plating, main treatment, washing and drying are performed in this order.
The treatment liquid used for the pre-treatment and the main treatment varies depending on the content of the treatment, but in any treatment, it is necessary to wash with water after each treatment in order to prevent mixing with the treatment liquid in the next step

FIG. 6 shows a conventional chemical conversion treatment apparatus for performing a chemical conversion treatment on metal parts. A pretreatment tank 1, a washing tank 2, a chemical conversion tank 3, a water washing tank 4, a chemical conversion tank 5, a water washing tank 6, and a drying tank 7 are arranged in a row, and the metal parts (not shown) to be chemically converted are stainless steel. The steel wire is held by a toy 8 such as a basket or a holder in which a steel wire is knitted in a net shape.
Are transported sequentially between the tanks. This transport is
Is suspended on the transport rod 9, a guide path 10 corresponding to each tank is provided, and the transport rod 9 is moved along the guide path 10.

Japanese Patent Application Laid-Open No. 7-292498 discloses that
A conventional plating apparatus for automatically plating metal parts is described. Also in this apparatus, a pretreatment tank,
A washing tank, a plating tank, a washing tank, a plating tank, a washing tank, a post-treatment tank, a washing tank, and a drying tank are arranged in a row, and the metal parts are sequentially transferred to each tank by a transfer machine to perform a plating process. It has become.

[0005]

In recent years, in surface treatment such as chemical conversion and plating, large-variety, small-quantity production has been greatly demanded. In response to such demands, a chemical conversion treatment apparatus shown in FIG. The plating apparatus disclosed in Japanese Patent Application Laid-Open No. 7-292498 is not practical because of the following problems. (1) Since a large number of processing tanks are arranged in the order of processing steps, a large installation space is required for the entire apparatus. (2) Since the chemical conversion treatment or the plating treatment is performed for a specific type of treatment, the treatment tanks are arranged so as to be adaptable only to the specific treatment, and the versatility to other treatments is poor. Therefore, when changing the processing contents,
It is necessary to use another device suitable for the processing. Also,
In order to use the same apparatus, it is necessary to perform a setup such as rearranging the order of the processing liquids in accordance with the processing step order, which is a complicated operation.

In order to avoid such inconveniences, a large number of treatment tanks are arranged two-dimensionally, and metal parts are transferred to each tank by an automatic transfer means such as a robot. Not only this processing such as
It is preferable to perform each treatment such as a pretreatment, a washing treatment, a drying treatment, and a post treatment. When performing such processing, it is necessary to arrange a large number of processing tanks, and it is necessary to make the processing tanks as small as possible in view of the installation space.

However, when the processing tank is made smaller, the processing liquid deteriorates rapidly, so that the processing liquid needs to be replaced frequently, and the workability is reduced. For this reason, it is necessary to take measures to reduce the frequency of replacing the processing liquid.

On the other hand, Japanese Patent Application Laid-Open No. 5-287543 discloses that the performance of the plating process can be improved by performing an intermediate process such as washing, draining, and drying between the steps of the plating process. Have been.
However, even such an intermediate treatment cannot prevent the progress of the deterioration of the processing solution, and furthermore, by inserting the intermediate treatment between the respective steps, not only the total number of steps is increased, but also the number of steps is increased. It has a complicated problem.

The present invention has been made in consideration of such conventional problems, and is suitable for small-quantity production of many kinds, has a small installation space, and further suppresses the progress of deterioration of the processing solution. It is an object of the present invention to provide a surface treatment method and a surface treatment apparatus for a metal component that can perform the following.

[0010]

In order to achieve the above object, a surface treatment method according to the present invention comprises a plurality of washing tanks for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying. A method of performing a surface treatment of a metal component using a surface treatment apparatus having a tank, wherein the water or the treatment liquid is drained immediately after the treatment with water or the treatment liquid.

In general, the quality of a chemical conversion treatment or a plating treatment on a metal part depends on the quality of a metal film formed by the treatment solution. Therefore, the concentration and composition of the treatment solution and the concentration of unnecessary metal ions are: This is one of the important process control items in performing high quality chemical conversion treatment or plating treatment with less variation.

The processing solution not only consumes components due to chemical conversion treatment or plating treatment, but also takes out the processing solution as the metal parts to be spontaneously evaporated or processed is taken in and out of the processing tank, and the processing solution in the preceding process is brought in with time. Deteriorates. Then, it is necessary to replace the entire amount of the processing solution that has deteriorated to the limit or to newly add necessary components.

According to the present invention, in order to minimize deterioration due to carry-in and take-out of a metal part from a previous process, the water or the treatment liquid is drained immediately after the treatment with water or the treatment liquid. . For example, in the chemical conversion treatment, pretreatment, water washing, chemical conversion treatment, water washing, chemical conversion treatment, water washing,
The treatment is performed in the order of drying, and in any of the chemical conversion treatments, the preceding step is a water washing treatment. That is, the treatment liquid for the chemical conversion treatment tends to be diluted with water as the metal parts are taken in and out.

[0014] In a chemical conversion treatment apparatus which is particularly suitable for high-mix low-volume production and can be installed in a small space, the treatment tank is small, and the rate of dilution of the treatment liquid with water is large. Deterioration is faster.
To prevent this, immediately after washing with water,
Drain water to reduce the amount of water brought into the next chemical conversion treatment. Thus, the treatment liquid can be prevented from being diluted with water, and deterioration of the treatment liquid can be suppressed.

[0015] In the water washing after the chemical conversion treatment,
The treatment liquid adhering to the metal component is drained during the chemical conversion treatment. This can prevent the water used for washing from being deteriorated by the treatment liquid.

The liquid can be easily drained by blowing a gas such as air onto the metal parts to blow off water or the processing liquid, or by vibrating or rotating a toy holding the metal parts to shake off the water or the processing liquid. Can be done.

Further, in the present invention, such drainage is performed immediately after the treatment with water or the treatment liquid. This is because, after a lapse of time from washing with water or treatment with the treatment liquid, it causes troubles such as white spots, and the metal parts are prevented from drying as much as possible.

According to a second aspect of the present invention, there is provided a surface treatment apparatus for metal parts, comprising a plurality of tanks including a washing tank for washing, a treatment tank filled with a treatment liquid, and a drying tank for drying. At least one surface of the jaws holding the metal parts and the chuck holding the jaws for transporting the metal parts has water repellency.

In a surface treatment such as a chemical conversion treatment or a plating treatment, a water repellency is imparted to a surface of a net-shaped basket or a cup for holding metal parts and / or a chuck for holding metal toys for transporting metal parts. With the provision, the water and the processing liquid adhered in the previous process slide down from the surface of the jaws and the chuck immediately after the processing. For this reason, the water or the processing liquid can be smoothly drained immediately after the processing, and deterioration of the water or the processing liquid in the next step can be prevented. Further, since the amount of water and processing liquid taken out of the processing tank is reduced, the frequency of replacement and replenishment of the processing liquid is reduced even in a small processing tank.

The material which imparts water repellency to the surface as described above includes silicone resins such as silicone rubber, olefin resins such as polyethylene, and Teflon (trade name).
And the like can be used. The jaws or the chuck may be formed of these materials, or only the surface may be coated with these materials.
Also, water repellency may be imparted to either or both surfaces of the jaws and the chuck.

According to a third aspect of the present invention, there is provided a metal part surface treatment apparatus comprising a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying. And a chuck for holding the metal component or a toy for holding the metal component is provided with a gas ejection nozzle for blowing off the liquid adhering to the surface of the metal component.

According to the present invention, the gas is blown from the ejection nozzle provided on the chuck to the metal parts and the toy, so that the water and the processing liquid adhering to the parts are quickly blown off. Can be. Therefore, carry-on to the processing tank in the next step is eliminated, and deterioration of the processing liquid in the processing tank can be suppressed.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The surface treatment of the present invention is described below.
The chemical conversion treatment is specifically described as an embodiment. In addition,
The present invention can be applied not only to the chemical conversion treatment but also to the plating treatment.

(Embodiment 1) FIG. 1 shows a chemical conversion treatment apparatus 11 for performing a chemical conversion treatment on the surface of a metal component. In the chemical conversion treatment apparatus 11, a plurality of tanks 12 each including a washing tank, a treatment tank, and a drying tank arranged two-dimensionally are arranged on the upper surface side, and a transfer device 13 is provided at an upper part.

The tank 12 is inserted from a receiving port 19 provided two-dimensionally on the upper surface of the chemical conversion treatment apparatus 11. FIG. 2 shows the tank 12, which is entirely formed into a bottomed cylindrical shape.
In addition, a flange portion 12a is formed on the upper side, and the flange portion 12a is locked to the upper surface of the chemical conversion treatment device 11 to prevent falling (in FIG. 1, the flange portion 12a is formed). The size and shape of the tank 12 are common to water washing, chemical conversion treatment, and drying, and its use is determined by the liquid stored in the tank 12. In the tank 12 containing each liquid,
The address (position) of the upper surface of the chemical conversion treatment device 11 is determined, and each step for the chemical conversion treatment is performed based on the address by control by a control device (not shown).

Although not shown in FIG.
In the bottomed portion, a discharge port for discharging liquid such as water or a chemical conversion treatment liquid contained in the tank 12 and a supply port for supplying a new replacement liquid are provided. It is also possible to connect a pipe connected to the section, a storage device for each liquid, and a replacement pump. Further, it is also possible to arrange an ultrasonic vibrator on the outer peripheral portion of the tank 12.

The transport device 13 includes an X-axis guide 14, a Y-axis guide 15 that moves along the X-axis guide 14, and a vertical movement unit 16 that moves along the Y-axis guide 15. A chuck 17 is attached to the vertical movement unit 16 so as to be vertically movable. The chuck 17 holds the metal component 25 (see FIG. 2) to be processed by chucking.

A conveyor 18 is connected to the chemical conversion treatment apparatus 11, and the metal parts to be treated are carried to the chemical conversion treatment apparatus 11 by the conveyor 18. Then, the above-described transport device 13 is driven under the control of the control device, so that the tank 12 filled with water or the processing liquid is formed.
Then, the metal parts 25 are sequentially conveyed and subjected to water washing and chemical conversion treatment.

FIG. 3 shows the chuck 17. Chuck 17
Are a pair of arms 17a and 17b for holding the metal component 25.
It has. A jet device 21 is attached to a surface of one arm 17a facing the other arm 17b. The ejection device 21 has a plurality of ejection nozzles 22 for blowing gas such as air to the metal component 25 held by the chuck 17. Note that a pipe 20 connected to the gas supply device is connected to each of the ejection nozzles 22 so that gas can be ejected.

In this embodiment, as the metal part 25, a pipe made of brass having a diameter of 50 mm is subjected to a blackening treatment with copper. Table 1 shows the conditions of this processing.

[0031]

[Table 1]

The chemical conversion treatment in this embodiment is shown in Table 1.
As shown in the figure, in the pre-processing, the product name “Gospel Dash 5
000 (manufactured by Gospel Kako Co., Ltd.) "is subjected to alkaline degreasing with a treatment solution of 5%, and then washed with city water. In the first chemical conversion treatment, the product is treated with a treatment solution of 20% of trade name “Ebonol BA (manufactured by Meltex Co., Ltd.)”, and then washed with city water. In the second chemical conversion treatment, the treatment is carried out with a treatment solution of 20% / 28% of trade name "Ebonol C Special A solution / B solution (manufactured by Meltex Co., Ltd.)", followed by washing with pure water and hot air Dry and finish the process.

The pretreatment liquid, city water, first chemical conversion liquid, city water, second chemical conversion liquid, and pure water in each of the above steps are shown in FIG.
The tanks 12 shown in FIG. 3 are separately charged and the other tanks 12 are filled with a processing solution for plating or other types of chemical conversion treatment.

When shifting from the previous step to the next step, the metal part 25 is held by the chuck 17 and transported to the tank 12 of the next step, and the metal part 25 12 is immersed. During this immersion, the chuck 17 is withdrawn from the liquid by being pulled out of the tank 12.

In this embodiment, immediately after the three washing operations, air was blown from the ejection nozzle 22 of the ejection device 21 to the metal part 25 to blow off the water for washing. The water for washing was blown off when the metal part 25 was lifted from the washing tank, and the spouted water was allowed to fall into the washing tank.

Next, as Comparative Example 1, immediately after the three water-washing treatments, air was not blown to blow off the water for the water-washing, and the other treatments were similarly performed.

In the first embodiment and the comparative example 1, the quality of the chemical conversion treatment is deteriorated because the color of black dyeing becomes close to red and becomes thin or uneven, thereby reducing the quality of the first chemical conversion treatment and the second chemical conversion treatment. Table 2 shows the number of metal parts 25 that could be treated before the treatment liquid used in the chemical conversion treatment reached the end of its life. In Comparative Example 1, 2500 treatments were the limit, but in this embodiment, treatments up to 4000 treatments are possible, and draining has a longer life and suppresses deterioration of chemical conversion treatment. You can see that.

(Embodiment 2) In this embodiment, the same chemical conversion treatment apparatus, the same chemical conversion treatment conditions, and the same metal parts 25 as those in Embodiment 1 are used. In this embodiment, although not shown, a bottomed cylindrical toy made of a stainless steel wire braided in a net shape is used, and a metal part 25 is provided in this toy.
And transported by chucking the toy with the chuck 17.

Immediately after all the water washing treatments, the toy containing the metal parts 25 is lifted from the water surface of the washing tank by the up-down movement unit 16 and the up-down movement is performed while the outer periphery of the toy is being gripped by the chuck 17. Unit 16
Was vibrated up and down five times at high speed. As a result, the washing water attached to the metal parts 25 and the toy was shaken off.

Table 2 shows the number of metal parts 25 that can be treated before the treatment liquid used in the first chemical conversion treatment and the second chemical conversion treatment reaches the end of its life, similarly to the first embodiment. . Also in this embodiment, the number of processes is large. In addition to this, it is possible to suppress the deterioration of the chemical conversion treatment without requiring new equipment such as the ejection device 21 as in the first embodiment.

(Embodiment 3) In this embodiment, too, the same chemical conversion apparatus, the same chemical conversion conditions, and the same metal parts 25 as those of Embodiment 1 are used. Immediately after the rinsing process, air was blown from the jetting device 21 to blow off the rinsing water.

In this embodiment, the processing is carried out by using the toy 23 shown in FIG. 4 and storing the metal parts 25 in the toy 23. The yatoy 23 is formed in a cup shape made entirely of Teflon (trade name), and a Teflon net 24 is stretched over upper and lower openings. The surface of such a toy 23 has water repellency, and when air is blown against the toy 23, water for washing falls smoothly.

As Comparative Example 2, the metal part 25 was held by a cup-shaped toy having the same shape as that of FIG.

Table 2 shows the number of metal parts 25 that could be processed before the treatment liquid used in the first chemical conversion treatment and the second chemical conversion treatment reached the end of its life. In Comparative Example 2, since processing is performed even on the toy that does not need to be processed, and the necessary components of the processing liquid are consumed, the deterioration of the processing liquid is accelerated. On the other hand, in this embodiment, since the yatoy 23 is a water-repellent Teflon, the drainage of water and the processing liquid is improved,
The amount of water brought in and the amount of processing liquid taken out of the pre-washing process is reduced, and the necessary components are not consumed.
For this reason, it turns out that the service life of the chemical conversion treatment liquid is longer than that of the second embodiment.

(Embodiment 4) In this embodiment, the same chemical conversion apparatus, the same chemical conversion conditions, and the same metal parts 25 as those in Embodiment 1 are used.
Immediately after the water washing treatment, air was blown from the jetting device 21 to blow off the water for water washing. The metal component 25 was held by a Teflon cup-shaped toy 23 shown in FIG. Further, a chuck 26 shown in FIG. The chuck 26 is formed so as to correspond to the shape of the outer peripheral surface of the toy 23, and has a tip portion 26a coated with a silicone resin. This imparts water repellency to the tip portion 26a.

Table 2 shows the number of metal parts 25 that could be processed until the processing liquid used in the first chemical conversion treatment and the second chemical conversion treatment of this embodiment reached the end of its life. In this embodiment, not only the jaws 23 but also the chuck 26 are made of a water-repellent silicone resin, so that the water and the treatment liquid are drained more easily. The amount is reduced and the necessary components are not consumed. Therefore, it can be seen that the drainage effect is higher than in the third embodiment, and the life of the treatment liquid is extended.

[0047]

[Table 2]

From the above description, the present invention includes the following inventions.

(1) In a chemical conversion treatment method in which a chemical conversion treatment apparatus is used, in which a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment solution, and a drying tank for drying are arranged, are used. A chemical conversion treatment method, wherein the water or the treatment liquid is drained immediately after the treatment with water or the treatment liquid.

In the present invention, since the water or the processing liquid is drained immediately after the processing, the processing liquid in the subsequent processing does not deteriorate. For this reason, the tank for storing water and the processing liquid can be made smaller, and the installation space can be made smaller.

(2) Chemical conversion treatment of metal parts is performed by using a chemical conversion treatment apparatus in which a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying are two-dimensionally arranged. In the chemical conversion treatment method, immediately after the treatment with water or a treatment liquid, the water or the treatment liquid is drained, and the chemical conversion treatment method for a metal component is performed.

In the present invention, since a plurality of tanks are two-dimensionally arranged, the installation space can be further reduced.

(3) In a chemical conversion apparatus for metal parts, which is provided with a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying, a toy for holding at least the metal parts is provided. And a chemical conversion treatment apparatus, wherein one surface of a chuck for holding the toy for transporting the metal component has water repellency.

According to the present invention, since the water and the processing liquid adhering to the metal parts slide down from the surfaces of the jaws and the chuck immediately after the processing, the deterioration of the water and the processing liquid in the next step can be prevented. In addition, since the amount of water and processing liquid taken out of the processing tank is reduced, the frequency of replacement and replenishment of the processing liquid is reduced even in a small processing tank.

(4) In a chemical conversion apparatus for metal parts, in which a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying are two-dimensionally arranged, at least the metal parts are treated. A chemical treatment apparatus, wherein one of surfaces of a holding jaw and a chuck for holding the jaw for transporting the metal component has water repellency.

In the present invention, since a plurality of tanks are arranged two-dimensionally, the installation space can be reduced.

(5) In a chemical conversion apparatus for metal parts, in which a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying are arranged, the metal parts or A chemical treatment apparatus characterized in that a chuck for holding a metal member for holding a metal component is provided with a gas ejection nozzle for blowing off liquid attached to the surface of the metal component.

According to the present invention, water or treatment liquid adhering to metal parts or toys is quickly blown off by blowing gas from an injection nozzle provided on the chuck.
The liquid can be surely drained, the carry-in to the processing tank in the next step is eliminated, and the deterioration of the processing liquid in the processing tank can be suppressed.

(6) In a chemical conversion treatment apparatus for metal parts, a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying are two-dimensionally arranged. And a chuck for holding the metal part or a toy for holding the metal part is provided with a gas ejection nozzle for blowing off the liquid attached to the surface of the metal part.

In the present invention, since a plurality of tanks are arranged two-dimensionally, the installation space can be reduced.

[0061]

As described above, according to the first aspect of the present invention, the water or the processing liquid is drained immediately after the processing with the water or the processing liquid. Deterioration due to carry-in from the previous process can be suppressed, the size of the tank can be reduced, the installation space can be reduced, and processing suitable for high-mix low-volume production can be performed.

According to the second aspect of the present invention, since the water and the treatment liquid smoothly slide down from the metal parts and the toy and are not brought into the next step, it is possible to prevent the deterioration of the water and the treatment liquid in the next step. In addition, since the amount of water and processing liquid taken out of the processing tank is reduced, the frequency of replacement and replenishment of the processing liquid is reduced even in a small processing tank.

According to the third aspect of the present invention, water or a processing liquid is quickly blown off by blowing a gas from a jet nozzle to a metal part or a toy, so that the liquid can be reliably drained. Can be prevented from being brought into the processing tank, and the deterioration of the processing liquid in the processing tank can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chemical conversion treatment apparatus.

FIG. 2 is a sectional view of a tank for performing a treatment.

FIG. 3 is a side view of the chuck.

FIG. 4 is a perspective view of a yatoy.

FIG. 5 is a partial perspective view of another chuck.

FIG. 6 is a perspective view of a conventional chemical conversion treatment apparatus.

[Explanation of symbols]

 11 Chemical conversion treatment device 12 Tank 17 Chuck 22 Spout nozzle

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Ikuo Kawakami F-term in Olympus Optical Co., Ltd. 2-43-2 Hatagaya, Shibuya-ku, Tokyo 4K026 AA06 AA25 BB01 DA07 DA10 DA11 DA12 EA08 EB00

Claims (3)

[Claims] 1. A method for performing a surface treatment of a metal component using a surface treatment apparatus having a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying. A method for treating a surface of a metal component, comprising draining the water or the treatment liquid immediately after the treatment with the treatment liquid. 2. A surface treating apparatus for a metal part, comprising a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying, wherein a toy holding the metal part and the metal A surface treating apparatus for a metal part, wherein at least one surface of a chuck for holding the part for transporting the part has water repellency. 3. A surface treating apparatus for metal parts having a plurality of tanks including a washing tank for washing with water, a treatment tank filled with a treatment liquid, and a drying tank for drying, wherein the metal parts or the metal is disposed between the tanks. A surface treating apparatus for metal parts, characterized in that a chuck for holding the parts for holding the parts is provided with a gas ejection nozzle for blowing off the liquid adhering to the surface of the metal parts.