JPS58109159A - Treating method for material to be treated - Google Patents

Abstract

PURPOSE:To use bath liquid efficiently while reducing the initial amount of bath liquid by adding to the bath liquid a prescribed amount of a packing material which is inactive and fluidized in the bath liquid and thus increasing the apparent volume of the bath liquid, and then treating a material to be treated in the liquid. CONSTITUTION:When the material to be treated is treated in processes for degreasing, chemical conversion treatment, electrodeposition coating, etc., a packing material which serves as a bulk filler and consists of a material inactive in a treating solution and has such specific gravity that it is fluidized in the treating solution is added to the treating solution to increase its apparent volume. The constitution of the packing material depends upon the kind of bath liquid, the shape is not limited; it may be either solid or hollow and has about 10-300mm.phi size and an about 30-80% mixing rate. For example, hollow iron beads coated with insulating materials such as nylon are used for electrodeposition paint bath liquid; hollow nylon beads, etc., having superior solvent resistance are used for degreasing bath liquid and expanded polyurethane beads, etc., are used for bath liquid for chemical conversion treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating a workpiece in a bath liquid having an increased apparent volume.

Recently, a continuous conveyor system, which is more productive than a batch system, has been adopted as a method for treating objects to be treated in 111, such as degreasing, chemical conversion treatment, and electrodeposition coating. However, in the case of a continuous conveyor type, in order to obtain sufficient processing time, the length of the salt treatment bath must be increased, resulting in a larger treatment tank and the treatment liquid (bath # There is a problem that the amount of reef bath L) required is several times that of the batch method, which is uneconomical. (9) Since the amount of bath liquid is larger than in the batch method, the replacement efficiency of the replenishing treatment liquid with new bath liquid is low, resulting in deterioration of the bath liquid components, volatilization of the solvent in the bath liquid, etc. There is also the problem that the replenishment bath solution cannot be used effectively, such as having to replace the entire bath solution with a new one.

Possible countermeasures to the above problems include: ■ shortening the length of the treatment tank and lowering the conveyor speed; and ■ lowering the amount of active ingredients in the bath liquid. Processed material? : Another drawback is that productivity is reduced due to the inability to escape, and method (2) uses a bath liquid with low active ingredients, which has a poor treatment effect and does not produce stable quality processed products. Both methods are unsatisfactory as methods for obtaining high-quality processed products with high productivity.

The present invention solves the above-mentioned problems of the prior art, and reduces the amount of bath solution created by inserting a filler into the bath solution that can increase the volume of the bath solution. In addition, the present invention provides a processing method that can improve the replacement efficiency of the replenishment bath liquid and obtain high-quality processed gold with good productivity.

That is, the method for treating a workpiece of the present invention provides a bath solution with a filler for increasing the bath solution, which is made of a substance that is inactive in the bath solution and has a specific gravity that allows it to flow freely in the bath solution. This system is characterized by the fact that the apparent volume increases by adding a predetermined amount of .

The filler for increasing the bath liquid used in the invention can have different configurations depending on the type of bath liquid.

That is, at least the outer layer needs to be formed of a material that is inert in the bath liquid, but the shape is not particularly limited.
It can be spherical, square, or irregular, full,
The lateral movement may be formed of the same material, or may be formed of two or more layers of different types of materials. The inside of the packing may be hollow or solid, and is appropriately selected depending on the specific gravity of the bath liquid.

Specifically, for example, hollow iron balls covered with an insulating material such as nylon are used for electrocoating paint baths, and hollow nylon balls, polyethylene balls, and polypropylene balls with excellent solvent resistance are used for degreasing bath solutions. In addition to the above-mentioned materials, closed-cell foamed polyurethane balls and the like can be used in the chemical bath solution. In addition, polyvinyl chloride-coated hollow iron balls, gelatin balls, sponge balls, etc., or irregularly shaped objects thereof may be used.

The specific gravity (or apparent specific gravity) of the filler is selected from a range that allows the filler to easily flow in the bath liquid by stirring. Regarding the specific gravity, if you want to sink it to the bottom of the tank, it should be a little high, and if you want it to float near the surface of the bath liquid, it should be a little low. The specific gravity can be adjusted as appropriate (by inserting a core inside the filler or by changing the porosity).

The size of the filling material is appropriately selected depending on the shape, size, etc. of the object to be processed. From the point of view of stirring efficiency, a smaller diameter is preferable, but if it is too small, depending on the shape of the object to be treated, the filler may be scooped up together with the object when the object is pulled up, so it is better to have it somewhat larger. Specifically, 10 to 500Wφ
It is.

The bath liquid temperature ratio of these fillers should be approximately 30 to 80 degrees without impairing the agitation of the bath liquid in the tank and not interfering with the progress of the objects to be treated in the tank. Contamination is possible.

Hereinafter, the present invention will be explained in more detail using an electrodeposition coating method as an example.

FIG. 1 is an explanatory diagram showing an example of a nine-electrodeposition coating apparatus for carrying out the present invention. Electrodeposition bath 1 contains an electrodeposition paint bath solution (specific gravity t05
) 2 is filled, and a conveyor belt 5 is disposed above the tank 1 along the longitudinal direction of the tank 1. The object to be coated 4 is
It is suspended by a 71 ringer 5 projecting downward from the conveyor belt 3, and is electrocoated with bath liquid 2. 6,6°・
. . is mixed into the bath liquid 2 and has nine full horizontal motion. As shown in FIG. 2 0), the filling 6 is a hollow iron ball 6m whose outer circumference t is covered with insulating nylon 6b), with a straight 1
It has an apparent specific gravity of about 110 cmg and about 4.

In the electrodeposition coating apparatus having the configuration shown in FIG.
It is immersed in the bath liquid 2 of the electrodeposition tank 1, and while moving within the bath liquid 2, the electrodeposition liquid Nl! ! equipped. Since the filler 6 in the bath liquid 2 has almost the same specific gravity as the bath liquid 2, it is suspended in the bath liquid 2 in a state where it can easily flow. Therefore, as the object 4 moves through the bath 2, the fillings 6, 6. ... flows, so it does not interfere with the movement of the object 4 to be coated. (9) Since the outer layer of the filling 6 is coated with nylon, the filling 6 is not eroded by the bath liquid 2 and has good durability.

Other fillers used in the electrodeposition coating device include, for example, solid spheres made of foamed polyurethane 6C as shown in Figure 1s2 (←), and nylon 6C around the outer periphery of iron particles 6d as shown in Figure 1s2. It may also be an irregularly shaped object covered with a metal. In addition, the materials include silicone rubber, butyl rubber, and other chemical-resistant materials.
It has excellent solvent resistance and can also be used as a non-conductive material.
In this case as well, the apparent specific gravity of the filling can be adjusted by making it hollow and spherical, or by inserting a heavy core or the like.

The method of the invention is also applicable to degreasing and chemical conversion processes. In the case of a degreasing process, it is preferable to use a filler made of polyurethane balls, polypropylene balls, or nylon balls, and in the case of a chemical conversion process, it is preferable to use a filler made of, for example, foamed polyurethane balls. I can do it. In the case of a degreasing process, if the outer periphery of the filler is made of a somewhat rigid material, dirt adhering to the object to be treated can be physically removed during degreasing. (9) If you do not want to damage the outer surface of the object to be treated, it is better to use a filler made of a soft material.

As is clear from the above description, in the method of the present invention, the apparent volume of the bath liquid is increased by adding a filler for increasing the bath liquid, which is made of a substance that is inactive in the bath liquid, into the bath liquid. , the initial amount of bath liquid to be prepared can be reduced compared to the conventional method.

(9) Since the actual volume of the bath liquid is reduced, the replacement efficiency of the replenishing bath liquid is improved, and the amount of replenishment can be reduced. Therefore, the bath liquid can be used efficiently as a whole, and the amount of toilet bath liquid can be reduced, which is economical.

Furthermore, in the method of the present invention, the apparent volume of the bath liquid increases, so when the same amount of bath liquid tve as in the conventional method is used, the length t of the processing tank can be increased.

Accordingly, the conveyor line becomes longer and the conveyor speed can be increased, so a large amount of good quality treated salt can be delivered, resulting in the effect of simultaneously improving productivity and processing performance. play.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the method of the present invention, and Figures 2 (a) to (c) are sectional views showing examples of the filling material used in the method of the present invention. In the figure, 1...electrodeposition bath, 2...electrodeposition paint bath liquid, 3...conveyor belt, 4...object to be coated, 6...filler Patent applicant Toyota Motor Corporation −2

Claims (1)

[Claims] (1) The processing liquid in the processing tank is made of a substance that is inactive in the processing liquid and is capable of flowing in the processing liquid.
A predetermined amount of the processing liquid increasing filler is added, and the processing operation is performed in the processing liquid whose apparent volume has been increased.
-Characteristic method for processing objects to be processed.