JP2021134368A - Masking device - Google Patents

Abstract

To provide a masking device with a simple structure in a relatively inexpensive cost, which can, without covering an outside surface of a peripheral part of an apertural area of a to-be-coated cylindrical object, prevent itself from coming off and can surely close the apertural area with electrical conduction secured.SOLUTION: A masking device comprises: a plug member 2 for plugging an apertural area w1 of a to-be-coated cylindrical object W in order to seal the apertural area w1; and a conductive member 3 contacting the to-be-coated member W. The plug member 2 including a tapered outer peripheral surface 21 seals an inner peripheral edge of the apertural area w1 in such a state that an outer peripheral edge w2 of the apertural area w1 remains exposed by having a tip side of the outer peripheral surface 21 inserted into the apertural area w1. The conductive member 3 includes abutting parts 32 and 33 for resiliently abutting against an inner face of the to-be-coated object while being supported by the plug member 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a masking device that is attached to a tubular object to be coated when electrodeposition coating is applied to prevent the paint from adhering to the inner surface of the object to be coated.

In the conventional electrodeposition coating, the entire object to be coated is put into a coating tank and electrically conducted to the object to be coated, so that the surface portion exposed by the electric action is generally coated. ing.

In recent years, there is a specification requirement that a part of the outer surface of the article and the inner surface of the article are unpainted for the tubular article found in automobile parts and the like. There is a fact that technical means for ensuring electrical continuity, including methods, cannot be easily obtained.

When electrodeposition coating is applied to such a tubular article as an object to be coated, there is a technique of closing the opening with a cap-shaped closing member so that the paint does not adhere to the inner surface of the object to be coated, which is a non-painted area. It is open to the public (see, for example, Patent Document 1 below).

Jikken Sho 58-52288 Gazette

However, the conventional closing member has a fatal problem that the closing member comes off from the object to be coated due to an increase in internal pressure due to a temperature change in a coating process of immersion in a coating tank in electrodeposition coating. Further, the cap-shaped closing member that closes the opening has a disadvantage that the outer surface of the peripheral edge of the opening of the object to be painted is partially covered and a non-painted portion is generated. Further, in the cap-shaped closing member that closes the opening, not only the shape is relatively complicated, but also a plurality of closing members having different dimensions according to the change in the outer diameter of the opening of the tubular object to be coated are formed. It becomes necessary to prepare, management becomes complicated, and there are problems in terms of cost and quality such as coating unevenness.

In view of the above points, the present invention reliably prevents the closing member from coming off due to internal pressure without covering the outer surface of the peripheral edge of the opening of the tubular object to be coated, closing the opening and at the same time electrically conducting electricity. Furthermore, it is an object of the present invention to provide a masking device having a simple structure and a relatively low cost.

In order to achieve such an object, the present invention is a masking device attached to an object to be coated when electrodeposition coating is applied, and is inserted into an opening of a tubular object to be coated to seal the opening. The attachment member is provided with an energizing member in contact with the member to be coated, and the attachment member is provided with a tapered outer peripheral surface that continuously and gradually expands in diameter from the front end to the rear end, and is provided on the tip end side of the outer peripheral surface. The inner peripheral edge of the opening is sealed with the outer peripheral edge of the opening exposed by inserting at least a part of the current-carrying member into the opening, and the energizing member is supported by the insertion member. The insertion member is provided with a contact portion that elastically contacts the inner surface of the object to be coated so as to maintain the state in which the opening is sealed.

According to the present invention, an energizing member is provided on the insertion member, and further, the energizing member is provided with a contact portion that elastically press-contacts the inner surface of the object to be coated, so that the energizing member is provided from the opening of the object to be coated. By ensuring that the effect of preventing the insertion member from coming off is obtained and at the same time, the posture of the insertion member can be stabilized, the posture of the object to be coated in the paint tank can be maintained stably, and the coating quality can be made uniform. Can be done. Moreover, since it has a simple structure, it can be manufactured at low cost.

Further, in the present invention, when one opening formed at one end of the object to be coated is sealed by the insertion member, it is attached to the other opening formed at the other end of the object to be coated. The exterior member may be provided with an exterior member for sealing the other opening, in which case the exterior member is provided with a covering portion covering a predetermined area on the outer peripheral surface on the other end side of the object to be coated. Is preferable.

According to this, the unpainted portion can be formed in a predetermined region by the covering portion of the exterior member.

Explanatory cross-sectional view showing the usage state of the masking apparatus. Explanatory cross-sectional view which shows the insertion member and the current-carrying member.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the masking device 1 of the present embodiment is attached to a metal pipe component W which is a tubular object to be coated, and has an insertion member 2 made of an insulating material (for example, made of synthetic resin). It includes a current-carrying member 3 made of a conductive material (for example, made of metal). Further, the masking device 1 may include an exterior member 4 made of an insulating material (for example, made of synthetic resin).

As shown in FIG. 2, the insertion member 2 includes a tapered outer peripheral surface 21 whose diameter is continuously and gradually increased from the front end to the rear end.

In the energizing member 3, the base end portion 31 is inserted and supported by the insertion member 2, and a pair of contact portions 32 and 33 extending from the tip of the insertion member 2 are formed. The abutting portions 32 and 33 are provided so as to face opposite directions, and a spring portion 34 is formed between the abutting portions 32 and 33. The shape of the spring portion 34 is not limited to this shape as long as it has an elastic function. A conductive grip portion 5 extending outward from the rear end of the insertion member 2 is connected to the base end portion 31 of the energizing member 3.

As shown in FIG. 1, in the insertion member 2, the tapered outer peripheral surface 21 is brought into close contact with the entire inner peripheral edge of the opening w1 by inserting the tip side into one opening w1 of the pipe component W. Seal. At this time, the tapered outer peripheral surface 21 of the insertion member 2 is exposed without covering the outer peripheral edge w2 of the opening w1 of the pipe component W. As a result, a non-painted portion is not generated on the outer surface of the peripheral edge portion of the opening w1 of the pipe component W.

Further, when the contact portions 32 and 33 of the energizing member 3 are located inside the pipe component W, they are in a state of being pressed against the facing positions on the inner surface of the pipe component W by the urging of the spring portion 34. As a result, the insertion member 2 does not inadvertently come off from the pipe component W, the inner peripheral edge of the opening w1 can be firmly maintained, and the influence of the increase in the internal pressure of the pipe component W can be prevented. can do.

Further, since the insertion member 2 includes the tapered outer peripheral surface 21, the diameter is larger than the diameter (minimum diameter) of the tip of the outer peripheral surface 21 and smaller than the rear end (maximum diameter) of the outer peripheral surface 21. Any opening w1 having an opening in can be sealed. Moreover, since the insertion member 2 can seal the opening w1 of the pipe component W by the tapered outer peripheral surface 21, it is not necessary to provide a configuration for sealing on the opening w1 side of the pipe component W.

As described above, in the masking device 1 of the present embodiment, not only the energizing member 3 is provided on the insertion member 2, but also the energizing member 3 is elastically pressed against the inner surface of the pipe component W by the spring portion 34. By providing the portions 32 and 33, it is possible to construct the pipe component W with a simple structure at low cost, and it is possible to surely obtain the effect of preventing the insertion member 2 from coming off from the opening w1 of the pipe component W.

Further, as shown in FIG. 1, the exterior member 4 is fitted and sealed in the other opening w3 of the pipe component W. The exterior member 4 includes a tubular covering portion 41 that covers the outer peripheral surface 21 in the vicinity of the opening w3 when the opening w3 is sealed. The covering portion 41 can form a desired unpainted portion on the outer surface of the pipe component W by covering the region requiring masking. Further, ribs on one or more uneven surfaces may be provided near the opening of the exterior member 4 and inside.

Although not shown, the attachment member 2 shown in FIG. 2 is attached to the openings w1 and w3 at both ends of the pipe component W without providing the exterior member 4 in the other opening w3 of the pipe component W. Then electrodeposition coating can be performed. According to this, it is possible to apply coating to the entire outer peripheral surface of the pipe component W over the entire length without leaving any coating residue.

W ... Pipe parts (object to be painted), w1, w3 ... Opening, w2 ... Outer peripheral edge, 1 ... Masking device, 2 ... Insertion member, 3 ... Energizing member, 21 ... Outer peripheral surface, 32, 33 ... Contact part 4, ... Exterior member, 41 ... Covering part.

In order to achieve such an object, the present invention is a masking device attached to an object to be coated when electrodeposition coating is applied, and is inserted into one of the openings formed at both ends of the tubular object to be coated. An insertion member that is worn to seal one opening , an energizing member that is in contact with the member to be coated, and an exterior member that is attached to the other opening of the object to be coated and seals the other opening. The insertion member is provided with a tapered outer peripheral surface that continuously and gradually expands in diameter from the front end to the rear end, and by inserting at least a part of the front end side of the outer peripheral surface into the opening. The inner peripheral edge of the opening is sealed with the outer peripheral edge of the opening exposed, the energizing member is supported by the insertion member, and the insertion member maintains the state of sealing the opening. wherein comprising a contact portion to resiliently abuts against the inner surface of the object to be coated in order to, the outer member, characterized Rukoto includes a covering portion for covering a predetermined region of the outer circumferential surface of the other end of the object to be coated And.

According to the present invention, an energizing member is provided on the insertion member, and further, the energizing member is provided with a contact portion that elastically press-contacts the inner surface of the object to be coated, so that the energizing member is provided from the opening of the object to be coated. By ensuring that the effect of preventing the insertion member from coming off is obtained and at the same time, the posture of the insertion member can be stabilized, the posture of the object to be coated in the paint tank can be maintained stably, and the coating quality can be made uniform. Can be done. Moreover, since it has a simple structure, it can be manufactured at low cost. Moreover, since the exterior member is provided and the exterior member includes a covering portion that covers a predetermined region of the outer peripheral surface on the other end side of the object to be coated, the covering portion of the exterior member can form a non-painted portion in the predetermined region. can.

Further, the present invention is a masking device that is attached to an object to be coated when electrodeposition coating is applied, and is an insertion member that is inserted into an opening of a tubular object to be coated and seals the opening. The insertion member is provided with an energizing member in contact with the member to be coated, and the insertion member is provided with a tapered outer peripheral surface that continuously and gradually expands in diameter from the front end to the rear end, and at least a part of the outer peripheral surface on the tip end side is said. By inserting it into the opening, the inner peripheral edge of the opening is sealed with the outer peripheral edge of the opening exposed, the energizing member is supported by the insertion member, and the insertion member is the opening. A pair of abutting portions that abut on the inner surface of the object to be coated in order to maintain the sealed portion, and both abutting portions located between the abutting portions are pressure-welded to the inner surface of the object to be coated. It is characterized by having a spring portion for applying a force.

W ... Pipe parts (object to be painted), w1, w3 ... Opening, w2 ... Outer peripheral edge, 1 ... Masking device, 2 ... Insertion member, 3 ... Energizing member, 21 ... Outer peripheral surface, 32, 33 ... Contact part , 34 ... Spring part, 4 ... Exterior member, 41 ... Cover part.

Claims (2)

A masking device that is attached to the object to be coated when electrodeposition coating is applied.
An insertion member that is inserted into an opening of a tubular object to be coated and seals the opening, and an energizing member that is in contact with the member to be coated are provided.
The insertion member includes a tapered outer peripheral surface that continuously and gradually expands in diameter from the front end to the rear end, and by inserting at least a part of the front end side of the outer peripheral surface into the opening, the outside of the opening. The inner peripheral edge of the opening is sealed with the peripheral edge exposed.
The energizing member is supported by the insertion member and includes a contact portion that elastically contacts the inner surface of the object to be coated in order to maintain the state in which the insertion member seals the opening. A featured masking device. When one opening formed at one end of the object to be coated is sealed by the insertion member, the other opening is attached to the other opening formed at the other end of the object to be coated. Equipped with an exterior member to seal
The masking apparatus according to claim 1, wherein the exterior member includes a covering portion that covers a predetermined area on the outer peripheral surface on the other end side of the object to be coated.

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