JPH0351338Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a masking jig attached to a workpiece to be electrodeposited, and is particularly useful for masking required parts that are difficult to mask, such as tubular parts and curved parts of the workpiece. This invention relates to a masking jig that can be used to attach and detach masking.

BACKGROUND TECHNOLOGY Electrodeposition coating is often used on mass production lines because it is possible to uniformly coat even complex shapes, and it is also possible to coat a large number of workpieces suspended on a conveyor line in succession. ing.

During this electrodeposition coating, there are parts of workpieces of various shapes that do not require painting due to product properties and assembly convenience, so removable masking is usually applied to the parts that do not require painting.

Generally, such masking has been carried out by attaching so-called masking tape or masking film to areas of the workpiece that do not require painting.

The efficiency of masking by adhesion varies depending on the shape of the workpiece, and for example, it is difficult and difficult to apply such masking to parts with complex shapes such as tubular or curved parts of the workpiece. There were cases where it took a lot of effort or masking was impossible.

For this reason, it has been necessary to apply electrodeposition coating to the entire workpiece, including the parts that do not need to be painted, and then remove the paint from the parts that do not need to be painted, which is a method that requires a lot of time and effort.

Purpose of the invention In view of the above-mentioned current situation, this invention is a method that can be easily attached and detached and reused to the required parts of the workpiece where masking by pasting is difficult or impossible.
The purpose of the present invention is to provide a masking jig that can greatly improve masking work and electrodeposition coating efficiency.

Structure of the device This device consists of a pair of plate-shaped or cup-shaped masking members that are arranged opposite to each other so as to cover a desired part of a workpiece to be electrodeposited, and each member has an engaging part for suspension. A sealing material or packing material is provided on the outer periphery of the workpiece, and a permanent magnet is installed on the opposing inner surface of each member so as to be able to mutually attract the permanent magnet of the mating member, and a pair of masking members sandwich the workpiece. This masking jig for electrodeposition coating is characterized in that a sealed space is formed between the member and a sealing material or a packing material when magnetically attracted.

Effects of the invention The masking jig according to this invention covers and seals the parts of the workpiece that do not need to be painted using a pair of plate-shaped or cup-shaped masking members. For example, a ring-shaped permanent magnet attached to each masking member Since the masking member is fixed to the work by magnetically attracting the pair of members, it is extremely easy to fix and remove the masking.

Therefore, masking according to this invention is conventionally
It is easy to mask the inside of tubular and cylindrical parts and curved surfaces, which were difficult to mask, and it is now possible to mask the curved parts and perform electrodeposition coating with the same number of man-hours as when masking flat parts by adhesion. .

In addition, with this invention, the shape of the masking member can be made into a specific shape according to the workpiece, the jig can be attached and detached freely, the jig can be used repeatedly, and furthermore, electrodes can be attached to each member and it can be suspended. Since it has a supporting engagement part, it is most suitable for electro-deposition coating on a mass production conveyor line, and has the advantage of extremely high efficiency improvement effect by reducing the masking process.

When masking, it can be applied regardless of whether the work is magnetic or non-magnetic.Since a permanent magnet is inserted, leakage magnetic flux is also small.Furthermore, the work can be masked with a packing material placed around the masking member in advance or a sealing material interposed when it is installed and fixed. Since they are in contact with each other, they have the advantage of having a strong sealing effect combined with strong magnetic attraction.

Disclosure Based on Drawings of the Invention An embodiment of the invention will be described based on the drawings. FIG. 1 is a longitudinal sectional view of the masking jig according to this invention, showing an example of masking the inside of a cylindrical portion of a workpiece. FIG. 2 is a longitudinal sectional view of the masking jig according to this invention, showing an example of masking the opening curved surface of a plate-shaped workpiece.

The masking jig shown in FIG. 1 is composed of two disc-shaped masking members 1 and 2 having different diameters.

Each of the masking members 1 and 2 has a through bolt 3 screwed and fixed in the center thereof, and a ring-shaped engagement part 4 for suspending a jig is provided at the tip of the through bolt 3 which is on the outside when the members face each other. A magnet retaining plate 5 is fitted and arranged on the head side of the through bolt 3, that is, on the inside when the members face each other, and a ring-shaped permanent magnet 6 is attached.

Ring-shaped permanent magnet 6 of each masking member 1, 2
are arranged with different magnetic poles so that they are magnetically attracted when facing each other.

The workpiece 20 shown in Fig. 1 has a cylindrical shape with an opening in the axial direction, a small diameter opening at one end and a large diameter opening at the other end, and the entire part except the inside of the cylindrical part on the small diameter side is electrocoated. It is something that is given.

To mask the inside of the small-diameter cylindrical portion of the workpiece 20 that does not require painting, as shown in the figure,
A sealing material 7 is arranged around the outer periphery of the masking members 1 and 2 so as to close the opening of the cylindrical portion while the ring-shaped permanent magnets 6 and 6 are facing each other and magnetically attracted. Abut and fix through.

In this way, the entire inside of the cylindrical portion, which has been difficult to mask in the past, can be easily masked.

In addition, an electrode 9 for energization is arranged through one of the masking members 1 and brought into contact with the workpiece 20, and while being suspended and conveyed on a conveyor line,
Electricity can be applied from the same part, making electrodeposition coating easier.

The masking jig shown in FIG. 2 is composed of a pair of shallow and wide cup-shaped masking members 10 and 11.

As in FIG. 1, each masking member 10, 11 has a through bolt 3 screwed and fixed in the center thereof, and a ring-shaped engaging portion 4 is provided at the tip of the through bolt 3.
A magnetic retaining plate 5 is fitted into the head of the through bolt 3, and a ring-shaped permanent magnet 6 is attached thereto.

Furthermore, an electrode 9 for energization is arranged through one of the masking members 10 .

The workpiece 21 shown in FIG. 2 is plate-shaped and has an opening at a predetermined portion to form an opening curved surface portion. Electrodeposition coating is applied to the entire opening except for the curved surface portion of the opening.

To mask the opening curved surface portion of the workpiece 21 that does not require painting, as shown in the figure, the aforementioned masking members 10 and 11 are placed in the opening while the ring-shaped permanent magnets 6 and 6 are facing each other and magnetically attracted. A packing material 8 wrapped around the outer periphery of the member is brought into contact and fixed so as to close the area.

Similarly to FIG. 1, masking can be easily applied to the entire curved surface of the opening, which was difficult to mask in the past. By pulling the part 4 and releasing it from the magnetic attraction, it can be easily removed from the workpiece 21.

In addition, each member including the masking member is magnetic,
Various materials can be selected as appropriate, regardless of whether they are non-magnetic or not.
The magnet retaining plate is preferably made of a ferromagnetic material.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the masking jig according to this invention, showing an example of masking the inside of a cylindrical portion of a workpiece. FIG. 2 is a longitudinal sectional view of the masking jig according to this invention, showing an example of masking the opening curved surface of a plate-shaped workpiece. 1, 2, 10, 11... masking member, 3...
... Fitting bolt, 4 ... Ring-shaped engagement part, 5 ... Magnet holding plate, 6 ... Ring-shaped permanent magnet, 7 ... Seal material, 8 ... Packing material, 9 ... Electrode, 20, 2
1...Work.

Claims (1)

[Scope of utility model registration request] It consists of a pair of plate-shaped or cup-shaped masking members arranged facing each other so as to cover the desired part of the workpiece to be electrodeposited, and each member has an engaging part for suspension and a sealing material or a sealing material on the outer periphery. A packing material is provided, and a permanent magnet is attached to the opposing inner surface of each member so as to be able to mutually magnetically attract the permanent magnet of the mating member. A masking jig for electrodeposition coating, characterized in that a sealed space is formed by a member and a sealing material or a packing material.