JPH06330397A - Surface covering treatment device - Google Patents

Abstract

PURPOSE:To form a covering film with uniform thickness on the whole surface of the treated part by discharging and removing gas collected on a recess part of an object to be treated. CONSTITUTION:A treating tank 3 storing a surface covering treatment liquid 2, a counter electrode 5 provided at the position in the lower side of the object to be treated 21 in the tank 3, an injection pipe 6 injecting the prescribed liquid 2 toward a treating part of the object to be treated 21, and an agitating means 9 stirring the treating liquid by rotating a rotary blade 8 with the injected treating liquid 2 are provided integrally, and many through-holes 18 for treating liquid are provided on the blade part 8A of the prescribed rotary blade 8, and a sucking opening 19 for treating liquid is provided on the circumferential of a supporting cylinder 7 housing and also supporting the rotary blade 8, and a stirred stream of the treating liquid is brought into the optimized state to discharge and remove the gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment apparatus for electrically treating a treatment object.

[0002]

2. Description of the Related Art As an object to be processed having a relatively deep recess, there is, for example, a scroll type rotor 21 of an air conditioner as shown in FIG. The rotor 21 has a surface-coated portion, that is, a treated portion and a non-treated portion. The treated portion has a peripheral surface 24 of a scroll portion 23 that forms a rotor sliding portion, that is, a recess 22.
And the inner bottom surface 25, and the non-treated portion is the bearing housing portion 26 provided in the central portion of the upper surface of the closing portion 27.

Conventionally, in the case of subjecting an object to be treated having a treated portion and a non-treated portion to a surface coating treatment, with the untreated portion masked, the opening 22A of the concave portion 22 faces upward, and the entire object to be treated is placed in the treatment liquid. It is common to immerse between the electrodes and to energize. However, the conventional method has a problem that time-consuming masking work is indispensable. As a surface coating method that omits this masking operation, a method of immersing only the treated portion of the object to be treated in the treatment liquid can be considered.

[0004]

By the way, in the method of immersing only the treated portion of the object to be treated in the treatment liquid, the masking work is unnecessary, but in the case of the rotor 21 shown in FIG. 3, the gas generated between the electrodes is generated. Adheres to the treated portion of the rotor 21 and interferes with the surface coating treatment, so that a uniform coating cannot be formed on individual products.

That is, the gas generated during the surface coating process
(For example, oxygen gas in the case of alumite treatment)
Since it is confined in 2, the gas adheres to the peripheral surface 24 and the inner bottom surface 25 of the scroll portion 23 and bubbles grow, which causes a problem that the surface coating cannot be partially performed. (For example, hydrogen gas in the case of alumite treatment) is also retained in the recess 22 and adheres to the scroll peripheral surface 24 and the inner bottom surface 25. Further, when the treated material is dipped in the treatment liquid, a gas enters the concave portion 22, and this gas causes a problem that the surface coating treatment of the concave inner bottom surface 25 is hindered.

The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to discharge and remove the gas collected in the concave portion of the object to be processed to obtain a coating having a uniform film thickness. It is an object of the present invention to provide a surface coating treatment apparatus capable of forming a film on the entire treated portion.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is directed to a treatment tank for storing a surface coating treatment liquid, a counter electrode provided below the treatment object in the tank for electrically treating the treatment object, and a treatment object. Of the surface coating treatment apparatus, which is equipped with a spraying means for spraying the liquid onto a portion to be treated and a stirring means for stirring the liquid, the stirring means being driven by the spraying means. It is characterized in that it is composed of rotating blades and that the blades of the blades are provided with a large number of holes.

Further, the present invention is characterized in that a treatment liquid suction opening is provided in a peripheral wall of a support cylinder for accommodating and axially supporting the rotary blade, the processing liquid suction opening penetrating in a direction orthogonal to the axis of the rotary blade. Further, according to the present invention, an injection pipe manifold for supplying and circulating a processing liquid is arranged in the processing tank, and a plurality of counter electrodes are arranged in a row and each tip of the injection pipe connected to the manifold is inserted. However, it is characterized in that a flow rate adjusting valve is provided in the middle of each injection pipe.

[0009]

According to the first aspect of the present invention, first, the object to be treated having the concave portion is set facing the counter electrode with the opening of the concave portion facing downward and only the treated portion is immersed in the treatment liquid. Therefore, when electricity is applied between the object to be processed and the counter electrode, and the operation of the processing liquid injection means is started, the gas that has entered the concave portion of the object to be processed when the object is immersed in the processing liquid, and the surface coating treatment The gas generated in the processing portion and the like is removed by the jet flow generated by the injection unit and the stirring action of the processing liquid generated by the stirring unit before it grows into large bubbles,
Further, the gas generated on the counter electrode side is discharged without moving to the concave portion of the object to be processed due to the jet flow and stirring of the processing liquid.

In particular, since a part of the processing liquid jetted by the jetting means passes through a large number of holes provided in the rotary blade, the rotation of the rotary blade is moderated, and the gas which tends to collect in the recess of the object to be processed is absorbed. It can be discharged smoothly to prevent bubbles from adhering and growing, and a uniform film can be formed without disturbing the formation of the treatment film. Needless to say, masking is not necessary for those that do not need to immerse the non-treated part of the object to be treated in the treatment liquid.

Further, according to the second aspect of the present invention, the rotation of the rotary blade sucks the processing liquid on the outer periphery of the supporting cylinder from the processing liquid suction opening to increase the processing liquid stirring flow rate. It is possible to smoothly and surely discharge the gas that tends to collect in the. Further, according to the invention of claim 3, the flow rate of the processing liquid ejected from each tip of the injection pipe which enters the inside of the plurality of counter electrodes can be adjusted by the flow rate adjusting valve to be equalized. It is possible to make the treatment liquid agitated flow that hits the object to be treated the same, and to treat each object under the same conditions.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, in which a scroll type rotor 21 of an air conditioner shown in FIG. 3 is used as an object to be processed, and a scroll which is a processing portion of the plurality of rotors 21 is used.
A surface coating apparatus 1 for alumite-treating a peripheral surface 24 of 23 and an inner bottom surface 25 of a recess 22.

The apparatus 1 comprises a treatment tank 3 for storing the surface coating treatment liquid 2, a treatment liquid injection pipe manifold 4 provided on the inner bottom of the treatment tank 3, and a cylindrical shape attached above the manifold 4. A plurality of counter electrodes (electrodes) 5 and a processing liquid ejecting means (injection pipe) 6 eccentrically and upwardly inserted in the lower part of the counter electrodes 5.
And a treatment liquid stirring means 9 consisting of a support cylinder 7 concentrically and upwardly attached to the outer periphery of the counter electrode 5 and a rotary blade 8 provided inside the upper end of the support cylinder 7, liquid
Circulation pump for supplying 2 to the manifold 4 and circulating it
10 and a flow rate adjusting valve 11 provided in the middle of each of the injection pipes 6.

The manifold 4 is formed below the counter electrode support plates 12A and 12B made of an insulating material, and the processing liquid 2 in the processing tank 3 is supplied by the pump 10 as shown in FIG. As shown in, the base ends of the plurality of treatment liquid injection pipes 6 are connected to the manifold 4 so as to communicate with each other. The flow rate adjusting valve 11 is provided to adjust the flow rate of the treatment liquid ejected from the tip of each injection pipe 6 to be uniform, and treats each object to be treated under the same condition and under the same condition. I can do it.

Common counter electrode supporting members 13A, 13 made of a conductive material are provided on inner surfaces of the counter electrode supporting plates 12A, 12B facing the upper ends.
B is fixed, the cathode is connected to the member 13B,
A collar portion 5A provided on the outer circumference of each counter electrode 5 is placed on the member 13A, 13B, and the collar plate 5A can be replaced with the support plates 12A, 12B by a mounting plate 14 made of an insulating material having a counter electrode insertion hole 14A. It is designed to be fixed to.

The counter electrode 5 is made of a lead pipe, and a processing liquid jetting pipe entry cutout portion 15 is provided on the peripheral surface of the lower half thereof, and the tip portion 6A of the jetting pipe 6 is directed upward in the counter electrode 5. And it is eccentrically entered. The tip end portion 6A of the injection pipe is connected to the injection pipe 6 fixedly inserted in the through hole of one counter electrode supporting plate 12A in the through hole, and is connected by the flange 16 to the counter electrode supporting plate 12A.
It is attached to the inner surface of.

Each counter electrode insertion hole 14 is formed on the upper surface of the mounting plate 14.
Concentric with A and mounting tubes 17 of stirring means 9 made of an insulating material capable of penetrating the counter electrode 5 are respectively provided upright, and the supporting cylinders 7 are externally fitted and fixed to the respective mounting tubes 17. The rotary vane 8 has a vane portion 8A having a substantially semi-circular shape and a large number of treatment liquid passage holes 18, and a boss portion 8B of the rotary vane 8 is formed by a horizontal shaft 8C parallel to the longitudinal direction of the manifold 4 so that the upper end of the support cylinder 7 is closed. It is rotatably attached to the section. On the peripheral surface of the upper end portion of the support cylinder 7, a horizontally long processing liquid suction opening 19 is provided on the injection pipe 6 side so as to penetrate in a direction orthogonal to the horizontal axis 8C.

Reference numeral 20 is a chuck for suspending the object to be processed, which is the rotor 21.
The non-treated bearing housing 26 is chucked and the recess 22 is hung so that it faces downward.
Directly above 5 and facing each other, the scroll part which is the processing part
A peripheral surface 24 of 23 and an inner bottom surface 25 thereof are immersed in the treatment liquid 2, and an anode is connected to the rotor 21. Next, a case where the treated portion of the rotor 21 is subjected to the alumite treatment according to the above embodiment will be described.

First, in the rotor 21, which is the object to be processed, the opening of the concave portion 22 is directed downward by the chuck 20 and the counter electrode 5 is used.
Located directly above the inner bottom surface 25 of the recess 22 and the treatment liquid 2
The interfaces are suspended at the same height, and only the treated part is immersed in the treatment liquid 2. In this state, the rotor 21 and
At the same time as energizing 5, the processing liquid circulation pump 10 is started.

The amount of the processing liquid ejected from the tip portion 6A of each processing liquid injection pipe 6 is adjusted in advance by using a flow meter and operating the flow rate adjusting valve 11.
Therefore, the processing liquid flow ejected from each injection pipe 6 hits the blade portion 8A of the rotary blade 8 of the stirring means 9 to rotate the rotary blade 8 in the direction shown by the arrow (a) in FIG. Since a part of the flow flows through the processing liquid passage hole 18 of the blade portion 8A, the rotation of the rotary vane 8 is moderated, and further, the processing liquid on the outer periphery of the support cylinder 7 is sucked from the processing liquid suction opening 19 to be processed liquid. Since the agitation flow rate increases, the agitation action of the processing liquid is in the optimum state for discharging the gas in the recess 22 of the rotor 21.

On the other hand, by energization, the rotor 21 (anode)
Is oxidized and an oxide film is formed on the treated portion of the rotor 21. At this time, the oxygen gas generated in the rotor 21 adheres to the peripheral surface 24 and the inner bottom surface 25 of the scroll portion 23.
By the stirring flow of the treatment liquid by 6 and the stirring means 9, the gas adhering to or staying in the recess 22 is discharged to the outside of the recess 22 to prevent the growth of bubbles in the recess 22, and
The gas generated on the counter electrode 5 (cathode) side is prevented from entering the recess 22.

In this way, by preventing bubbles such as hydrogen gas from adhering to the surface, the treated portion of the rotor 21 is uniformly surface-coated, and a uniform oxide film is obtained. Further, since the rotor 21, which is the object to be treated, is individually hung with respect to the counter electrode 5 and the treatment liquid agitating flow is generated in the same state, the oxide film for each product depending on the hooking position of the object to be treated as in the past. It is possible to improve the quality without any variation.

Further, according to the above-mentioned embodiment, since the processing liquid does not accumulate inside the object to be processed, it is easy to automate a series of operations such as dipping, supporting and taking out the object to be processed, and the object to be processed can be easily processed. The amount of processing liquid taken out at the time of taking out becomes small. Further, the masking work of the object to be processed can be eliminated, and even when the masking work is required, the masking accuracy is relaxed and the workability is improved. Further, a large number of objects to be processed can be processed at one time, and the productivity can be greatly improved.

In the above-mentioned embodiment of the present invention, the anodic oxidation for performing the alumite treatment is described, but the present invention is not limited to this and can be applied to plating. Also,
In the above embodiment, the counter electrode, the jetting means and the stirring means are integrally formed, but they can be separately provided in the processing tank. In this case, the counter electrode and the jetting means are provided with the surface coating treatment and the bubble discharge. So that
It is preferably provided at a position facing the opening of the recess of the object to be processed. Further, it is needless to say that the counter electrode, the injection means and the stirring means may be provided as one set in the processing tank so as to process one processing object, and in this case, the manifold 4 and the flow rate adjusting valve 11 can be omitted.

[0025]

As described above, according to the present invention, the processing tank for storing the surface coating processing solution and the object to be processed provided below the object to be processed in the tank are electrically processed. And a counter electrode for spraying the liquid to a portion to be treated of the object to be treated, and a stirring means for stirring the liquid, and the stirring means is driven by the jetting means. The agitation means is characterized by comprising rotary blades and having a large number of holes in the blades of the blades. Even if the processed object has a concave portion, the adhered gas can be discharged and removed to form a coating film having a uniform film thickness on the entire surface of the processed part, so that the quality of the processed object can be improved.

Further, the present invention is characterized in that a treatment liquid suction opening penetrating in a direction orthogonal to the axis of the rotary blade is provided on a peripheral wall of a support cylinder which houses and axially supports the rotary blade. Therefore, the agitation flow rate of the treatment liquid increases, the agitation flow reaches the entire surface of the treatment portion, and it is possible to effectively remove the adhering gas and prevent the growth of bubbles. further,
In the present invention, an injection pipe manifold for processing liquid supply circulation is arranged in the processing tank, a plurality of counter electrodes are arranged in a row, and the respective tip portions of the injection pipes connected to the manifold are respectively inserted.
Since it is characterized in that a flow rate adjusting valve is provided in the middle of each injection pipe, the flow rate of the processing liquid ejected from each of the plurality of injection means is made uniform, and the coating film thickness of each object to be processed is made uniform. In addition, it is possible to eliminate variations in quality among the objects to be processed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a partially omitted front view taken along the line AA of FIG.

3A and 3B show a scroll type rotor of an air conditioner which is an object to be processed, FIG. 3A is a plan view, and FIG. 3B is a sectional view taken along line BB of FIG. 3A.

[Explanation of symbols]

 1 Surface Coating Treatment Device 2 Treatment Liquid 3 Treatment Tank 4 Manifold 5 Counter Electrode 6 Injection Pipe (Injection Means) 7 Supporting Cylinder 8 Rotating Blade 8A Wing 9 Agitating Means 11 Flow Control Valve 18 Treatment Liquid Through-hole 19 Treatment Liquid Suction Port

Claims (3)

[Claims] 1. A treatment tank for storing a surface coating treatment liquid, a counter electrode disposed below the treatment object in the tank for electrically treating the treatment object, and a treatment object. The surface coating treatment device is provided with a spraying unit for spraying the liquid onto a portion to be treated and a stirring unit for stirring the liquid, and the stirring unit is a surface coating treatment device driven by the spraying unit, and the stirring unit is a rotating unit. A surface coating treatment device comprising a blade and having a large number of holes in the blade portion of the blade. 2. The surface of claim 1, wherein the peripheral wall of a support cylinder that accommodates and axially supports the rotary blade is provided with a processing liquid suction opening that penetrates in a direction orthogonal to the axis of the rotary blade. Coating processing equipment. 3. An injection pipe manifold for supplying and circulating a processing liquid is arranged in the processing tank, a plurality of counter electrodes are arranged in a row, and the respective tip portions of the injection pipes connected to the manifold are respectively inserted therein. The surface coating apparatus according to claim 1 or 2, wherein a flow rate adjusting valve is provided in the middle of each injection pipe.