JPS5956598A - Masking method of substrate in electrodeposition painting - Google Patents

Abstract

PURPOSE:To separate non-electrodeposited parts such as a hollow part and a projecting part in an electrodeposition painted object thoroughly from an electrodeposition painting liquid, by masking said parts by using a screwed cover, cap-like cover and packing. CONSTITUTION:A bolt-like cap 2 having a head part 2a is inserted into a hollow part 1a of a substrate 1 having the hollow part 1a from one inlet 1b thereof in the stage of subjecting the substrate to electrodeposition painting except the hollow part 1a. The substrate is tightened to a nut-like cap 2' in the opening 1b' at the other end via a rubber-like packing 3 thereby closing thoroughly hermetically the hollow part 1a. In the case of the substrate 1 having a projecting part 1d as the non-electrodeposition painting part, a projecting cover 4 is bolted 5 to the projecting part 1d in a collar part 4e to close hermetically the projecting part 1d. Even if the substrate is dipped in a electrodeposition vessel for a water paint having an extremely low viscosity, no paints intrude into the hollow part 1a and the projecting part 1d and the electrodeposition painting of said parts is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of masking an object to be coated in electrodeposition coating, which seals the inside of the hollow part or the convex part of the object to prevent the hollow part or the convex part from being completely coated.

1"Y41 (Metals used for products are prone to rust and corrosion, and there are two types of surface treatment: Blown ((VJ paint was the main type, but 1'' industry-made Jinyuu p'6 K ('F' paint film performance and large i1 'II\
In recent years, electrodeposition coating has attracted attention, and in particular, coating using 7γ1 has come to be practiced. This is to avoid painting the hollow interiors and convex parts of objects to be coated, such as products and parts that have hollows or convex parts. In order to do this, masking is done on this part, but in the conventional θ-blown 1-piece painting, the parts are first dark blue.]
Kete-buki (= J-ketari, also masking tape or tilt)
A masking method that hides the hollow space 1-1 and the convex portion by simple masking is sufficient. However, in the case of electrodeposition coating, the object to be coated must be immersed in an electrodeposition tank with an extremely low viscosity aqueous chamber Fl, and in the conventional masking method of spray painting, the hollow inside of the object 4. A masking method suitable for electrodeposition coating has been desired since it can easily be applied to convex parts and convex parts.

From the above point of view, the present invention ensures masking of electrodeposition coating on objects having hollows and convex portions with 1ft Qi, and moreover, with a large amount of 4t? 1. ．． The electric cable that I nine
To provide a method for masking an object to be coated.

Embodiments of the masking method of the present invention will be described based on the drawings.

Fig. 1 is a first embodiment showing the method in the case where the object (1) to be coated has a penetrating hollow shape. ). (2) is a bolt-shaped bolt, and the outer periphery of the head (2a) is knurled. (B) is knurled around the outer periphery with a nut-shaped flow, and is screwed into (2). (5) is a gasket inserted between the objects to be coated (1) and ii (2), which is made of rubber or synthetic resin and has heat resistance, acid resistance, etc. 44 material, especially silicone. The middle space where rubber is optimal; -1 note i! From (1b) to the bolt-shaped lid (2) (I
A penetrating Zenut-like lid extends to the 11th part (1b') of the hollow space on the J side (if you screw A on, both hollow openings (1b),
(1b') The K lid (2), (which was crimped and placed in the middle), acts as a sealing material to completely seal the hollow part (1a), and both hollow openings (111), (1b) and The hollow part (1a) is masked.

Figure 2 shows the threaded part (
1c). In this case, a bolt-shaped lid (2) is used to remove the threaded part (Ic) vcM in the hollow part (1a) of the object to be coated (1). (2), insert the gasket (3) into the hollow opening (1b) and tighten (,
If J, the hollow part (1a) is sealed.

FIG. 6 is a sixth embodiment showing the method when the object to be coated (1) is in the shape of a vibrator and a screw is carved in the hollow part (1a).
In this case, since the object to be coated (1) does not have much wall thickness, a groove (2c) smaller in diameter than the threaded part (2b) is provided in the head (2a) of the bolt-shaped lid (2). This groove (2c)
The packing (6) is inserted into the hole, and the outer diameter of the packing (3) is suitably larger than the outer diameter of the object to be coated (1).
Even if it is not tightened, the gripper (3) remains inside the workpiece (1) and prevents it from coming off part 1 (1b). (1d) This is an example showing a method when there is a convex portion (
1d) is formed into a hat shape to cap V, and a lid (4) with 11 digits of ns K R (4a) on one end is placed between the object to be coated (1) and approximately (4a). ) to the object to be coated (1) K using the pre-prepared screw holes
5) to tighten the object to be coated (1), f4i (4a)
The convex portion (1d) is sealed with a lid (4) and masked.

11 Examples of the masking method of the present invention are shown in Figs. In many cases, the masking methods of these embodiments are not used alone, but rather are used in combination in electrodeposition coating. The lid (2), (4), which is used to reliably mask the hollow part (1a) and the convex part (1d), and the gasket (6) are lined up between the threads, and the low fl! It can be completely masked even when immersed in a water-based paint electrocoating tank, and in mass production, it can be used as a masking material for the lid (2
), (4) 76- and packing (3) hardly wear out, so once they are made, they can be used over and over again.Moreover, they can be screwed onto the object to be coated (1) K masking. Is it extremely fl? It can be masked by simply kneeling, and is extremely effective for electrodeposition coating.

[Brief Description of the Drawings] Figure 1 shows the first embodiment of the present invention, and the object to be coated is J! Theory IV1 Figure 2 showing the masking method in the case of a hollow shape with a length of 15 m
The figure is an explanatory diagram showing the masking method in the case where the object to be coated is hollow and has a threaded portion without penetrating in the second embodiment, and Fig. 3 is an explanatory diagram showing the masking method in the case where the object to be coated is hollow and has a threaded part in the third embodiment. FIG. 4 is an explanatory diagram showing a masking method when the object to be coated has a convex portion in the fourth embodiment. (1)---Object to be coated (1a) ”...Hollow part (1
b)...Medium space 1 part (1d)...Convex part (ro)@-
・Patsukin (21, (4)-・Katian 31 figure Mako 74 figure

Claims (1)

[Claims] A screw-shaped lid (2) is attached to the inner space 171 (1b) of the object to be coated (1), and a convex portion (1d) is attached to the convex portion (1d) of the object to be coated (1) No. 11. Crown V: Hat-shaped lid with a rim (4
) are respectively screwed to sandwich the packing (3) and press-bond them to the object (1) to be coated.
I', '1 part (11)) Ya front NQ convex part (1d
) Completely seal the hollow part (1) of the object to be coated (1).
a) Is it special that the inside and the convex part (1d) of 011 are not painted? Method of masking the object to be coated in electrodeposition coating