JPS60125275A - Uniform treatment of article to be treated in dip tank - Google Patents

Abstract

PURPOSE:To uniformly treat an article to be treated, in immersing the article to be treating in a dip tank while grasping the same by the hanger of an overhead conveyor, by swinging said article to be treated to left and right. CONSTITUTION:An overhead conveyor 12 is run above a dip tank 10 and an article 15 to be treated such as a car body is allowed to advance through a treating solution in a state grasped by a hanger 14. In this case, a plurality of guides 16a are provided to the conveyor 12 so as to be alternately arranged left and right to swing the article 15 to be treated to left and right. By this method, treatment is uniformized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for uniformly treating objects to be treated in a dip tank.

In the manufacture of automobiles, etc., workpieces such as white bodies are immersed in various treatment tanks such as chemical conversion treatment baths and electrocoating baths while being held by hangers guided by over-heteradron bearings, and are subjected to chemical conversion treatment and electrocoating. Various treatments such as

However, many objects to be processed with complex shapes, such as automobile bodies, have bag structures, and when they are immersed in a processing tank, air pockets are likely to occur, resulting in uneven chemical conversion coatings and electrocoated coatings. There is a problem.Especially in the case of chemical conversion treatment, gas is generated during the treatment, so even if the material to be treated is placed in the treatment tank without creating air pockets, the gas generated can cause the air to become It is formed.

In view of the above points, the present invention provides a method for uniformly performing chemical conversion treatment, electrodeposition coating, etc., while eliminating processing defects caused by air pockets.

That is, the present invention provides a dipping method in which a workpiece is held by a hanger guided by an overhead conveyor and is immersed in a dip tank, in which the workpiece is shaken from side to side. This invention relates to a method for uniformly treating objects to be treated in a tank.

In the above, treatment mainly refers to chemical conversion treatment using phosphorous salts, etc. and electrodeposition coating, but it is also a concept that also includes degreasing treatment, washing with water, etc. In the present invention, Remove air pockets trapped in the bag structure by shaking or
Alternatively, it can be moved and processed uniformly. 1st to 2nd
The figure shows this schematically. In FIGS. 1 and 2, (1) is the object to be treated, and (2) is the treatment liquid.

In Figure '1, a large air pocket (3a) is taken into the lower part of the workpiece (1), but the workpiece (
By shaking 1) from side to side, air pockets) (3a) are removed.As a result, air pockets) (3a) are removed from the workpiece (1).
The area where a) was present is brought into contact with the treatment liquid (2) and subjected to treatment. In Figure 2, a small air pocket (
3b) is taken into the lower part of the object to be processed (1), but by shaking the object to be processed (1) from side to side, air pockets) (
3b) is moved, and as a result, the part of the object to be treated (1) where the air pocket (3b) was present is brought into contact with the treatment liquid (2) and subjected to treatment.

In actual processing, the removal and movement of air pockets is
Although their contributions vary in magnitude, they occur together and uniform processing is performed.

The method of the present invention can be carried out using existing hangers. 6 to 5 are schematic explanatory diagrams showing one embodiment of a mode in which an existing hanger is used.

In FIGS. 3 to 5, .alpha. is a dip tank, and the dip tank (g) stores a treatment liquid (b) such as a phosphate chemical treatment liquid or an electrodeposition coating liquid.

Above the dip tank α0) is an overhead conveyor (b).
It is suspended from the conveyor (ro) so that it can run smoothly. Toro! J Q8) is attached to a hanger so that it can rotate freely in the left and right direction.

An object to be treated (such as an automobile body) moves through the treatment liquid (11) while being held by a hanger (11), and is treated.

A plurality of guides 0a) and αsb) for pressing down the upper part of the hanger (B) are provided on the conveyor (B) alternately on the left and right. When the hanger (2) advances to one guide α6, one side of the upper girder of the hanger (2) is pressed by the guide α6, causing the hanger (2) to tilt in one direction.

When the bunker 0 → passes through the guide α (6) and advances to the guide σ (e) provided on the opposite side from the guide O →, the other side of the upper girder of the hanger 0 → becomes the guide σ 6
b), the hanger 0→ is tilted in the opposite direction to that in the above case. In this way, as the hanger progresses, the to-be-treated i) is swung left and right along with the hanger), so the air pocket is removed or moved, and the air pocket is removed or moved.
As a result, uniform processing is performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing how air pockets are removed by the method of the present invention, FIG. 2 is a schematic explanatory diagram showing how air pockets are moved by the method of the present invention, and FIG.
Figure 4 is a cross-sectional view showing an embodiment of the method of the present invention using an existing hanger, and Figure 5 is a cross-sectional view of a guide for swinging the hanger from side to side in the method shown in Figures 6 to 4. It is a perspective view showing an arrangement state. (Main symbols in the drawings) α0): Dip part Cap processing liquid Q21: Overhead conveyor ('):)l:l Cap hanger): Processed object α6 Sail α0): Guide 21 Fig. 22 Fig. 3 Fig. 4 figure

Claims (1)

[Claims] 1. Uniform processing of the object to be processed in a dip tank, in which the object to be processed is immersed in a dip tank while being gripped by a hanger guided by an overhead conveyor, and is characterized by shaking the object from side to side. Law.