JP6788552B2 - Masking jig for painting, its removal jig, and its set - Google Patents

Description

The present invention is used when painting a work having a through hole, and a masking jig for painting that prevents paint from adhering to the inner peripheral surface of the through hole of the work, and the masking jig for painting of the work The present invention relates to a removal jig for removing from the through hole, and a set thereof.

Conventionally, when painting on the outer surface of a work having a through hole such as a pipe, masking jigs are fitted at both ends of the through hole to seal the inside of the through hole so that the paint does not enter. For example, the masking jig described in Patent Document 1 is an elastic body arranged at both ends in the axial direction of the unpainted region of the through hole of the work, and is a mesher surface (inner peripheral surface) inclined with respect to the axial direction. ), Two caps having a male taper surface that is arranged inside the two seal members and abuts on the meteper surface of the seal member, and a force is applied in a direction approaching the two caps. Therefore, it is provided with a fixing means for fixing the relative positions of the two caps in a state where the male taper surface is pressed against the meteper surface. As a result, it is possible to improve the workability of attaching and detaching while preventing the masking jig for painting from falling off, ensuring high sealing performance even after repeated use, and the shaft of the through hole regardless of the shape of the through hole of the work. It is possible to mask any range of directions.

However, the masking jig of Patent Document 1 is a non-general-purpose product in which the sealing member, which is a consumable part, has an original shape. Therefore, for example, the procurement cost of the seal member (consumable part) is significantly increased as compared with the case where the seal member is supported by a general-purpose product (for example, an O-ring seal), and the life of the seal member (replacement frequency) and painting work efficiency are significantly increased. If the above are the same, the cost related to the work coating at the time of mass production will increase.

On the other hand, when the target work is limited to a work in which a convex portion is formed on the inner peripheral surface of the through hole as in the second and third embodiments of Patent Document 1, Patent Document 2 (FIG. With reference to prior documents such as 13) and Patent Document 3 (FIG. 1), the seal member and cap in the masking jig for coating described in Patent Document 1 are fitted with a cap into which a general-purpose O-ring seal is fitted (hereinafter, It may be changed to "O-ring seal cap" (see FIG. 1). In this case, since the procurement cost for the sealing member, which is a consumable part, can be remarkably suppressed, it is possible to suppress the cost related to the work coating at the time of mass production without sacrificing the coating quality and the life of the sealing member. is there.

Therefore, in the following, a case where a masking jig for painting having an O-ring seal cap is attached to the work only for a work in which a convex portion is formed on the inner peripheral surface of the through hole is attached to the work, and the outer surface of the work is painted.

When attaching the masking jig for painting having the O-ring seal cap to the through hole of the work, the two caps are tightened by tightening the nut attached to the shaft member as in the second or third embodiment of Patent Document 1. The force is applied in the direction of approaching each other, and the two caps both directly contact the convex portion formed on the inner peripheral surface of the through hole of the work, or at least one of the two caps enters the convex portion via the spacer. By abutting, the misalignment of the seal member can be reliably suppressed, and there is no problem in workability and work load of the operator.

Further, since the seal member is a simple O-ring seal, the surface pressure applied to the seal member after being attached to the through hole of the work is substantially uniform in the circumferential direction. Therefore, even if the O-ring seal is repeatedly used with the compression rate set to a relatively low value (for example, about 10 to 15%), high sealing performance can be ensured and the compression rate is relatively low, so that the seal can be sealed at an early stage. There is almost no risk that the member will reach the end of its life.

JP-A-2016-203164 Japanese Unexamined Patent Publication No. 08-247375 Jikkenhei 4-107600

On the other hand, when removing the painting masking jig having the O-ring seal cap from the through hole of the work, unlike the case of the painting masking jig of Patent Document 1, even if the nut is loosened, the O-ring seal is capped ( Since the state of being compressed in the radial direction is maintained over the entire circumference between the bottom surface of the annular groove and the through hole (inner peripheral surface) of the work, it is forced to pull out. For this reason, the cap cannot be easily removed manually, and the workability of attaching and detaching is lowered, which puts a burden on the operator's work.

Therefore, according to the present invention, it is possible to suppress the cost related to the work coating at the time of mass production without sacrificing the coating quality and the life of the sealing member while surely suppressing the misalignment of the sealing member, and the workability for attaching and detaching to the work It is an object of the present invention to provide a masking jig for painting, a jig for removing the masking jig, and a set thereof, which are good in quality and can reduce the work load of an operator.

Means for Solving Problems and Effects of Invention

One of the present inventions is intended for a work having a through hole having a convex portion protruding inward in the radial direction on a cylindrical inner peripheral surface, and prevents paint from adhering to the inner peripheral surface of the through hole. This is a set of a masking jig for painting and a jig for removing the masking jig that seals both ends of the through hole.
The masking jig for painting is
The first annular groove formed on the outer peripheral surface and
The first annular groove is formed on the outer side of the through hole in the central axial direction, and is arranged on the outer side of the through hole in the central axial direction from both end faces of the through hole when both ends of the through hole are sealed. 2 annular grooves and
An O-ring seal fitted in the first annular groove and
With two caps, and
A force is applied to the two caps in a direction approaching each other so that the two caps both abut on the convex portion of the through hole, or at least one of the two caps is the cap and the convex portion. Each O-ring seal of the two caps is in contact with the convex portion via a spacer arranged between the portions, and is sealed between the first annular groove and the inner peripheral surface of the through hole. Fixing means for fixing the relative positions of the two caps in the closed state,
Is equipped with
The removal jig
A work holder and a slide tool for holding the work so that the central axis direction of the through hole is horizontal are provided.
The work holder is
Both end faces of the held work located in the central axis direction of the through hole are formed in a shape in which the taper angle formed by the normal direction of the central axis is in the range of 1 ° or more and less than 45 °. Includes a tapered slope,
The slide tool
A pair extending in a direction parallel to the normal direction of the central axis of the through hole and facing each other so that the opposite side portions of the second annular groove formed on the outer peripheral surface of the cap can be slidable. The ridges and
It has an inclined surface having a shape inclined with respect to the normal direction of the central axis at an angle substantially equal to the taper angle of the tapered inclined surface of the work holder.
The pair of ridges of the slide tool are slidably engaged with the opposite side portions of the second annular groove of the cap, and the inclined surface of the slide tool and the tapered inclination of the work holder. It is characterized in that the cap of the masking jig for painting is removed from the through hole by relatively moving each other in a state of being in contact with the surface.

According to the masking jig for painting having the above configuration, in the work, two caps in which O-ring seals are fitted in the first annular groove on the outer peripheral surface are attached to both ends of the through hole having the convex portion formed on the inner peripheral surface. By abutting and applying a force in the direction in which the two caps approach each other by the fixing means, the two caps both come into contact with the convex portion of the through hole (a spacer is arranged between the cap and the convex portion). (If so, at least one of the two caps abuts on the protrusion via a spacer), and each O-ring seal of the two caps seals between the first annular groove and the inner peripheral surface of the through hole. The relative positions of the two caps can be fixed in the stationary state. As a result, the two caps can be fixed to both ends of the through hole to the extent that there is no positional deviation in the central axis direction of the through hole, and the through hole can be sealed, and the inner peripheral surface of the through hole of the work can be sealed. It is possible to prevent the paint from adhering.

Further, a general-purpose O-ring seal can be used for the first annular groove on the outer peripheral surface of the cap provided in the masking jig for painting. The surface pressure applied to the O-ring seal after attaching caps to both ends of the cylindrical through hole is substantially uniform in the circumferential direction. Therefore, even if the O-ring seal is repeatedly used in a state where the compression rate is set to be relatively low (for example, about 10 to 15%), high sealing performance can be ensured and the compression rate is relatively low. It is considered that there is almost no risk that the ring seal will reach the end of its life early. Therefore, as compared with the case where the sealing member for sealing the through hole is a non-general-purpose product as in Patent Document 1, the cost of the sealing member, which is a consumable part, without sacrificing the coating quality and the life of the sealing member. Is significantly suppressed, and compared with the case of the masking jig for painting of Patent Document 1 and the case where the masking jig for painting has the same configuration as the present invention but does not use the removal jig (reference example 1 described later). However, the cost related to the work coating at the time of mass production can be suppressed.

Further, in the work of removing the masking jig (cap) for painting that seals the through hole from the through hole, a dedicated removal jig is used. Specifically, first, the work is held by the work holder so that the central axis direction of the through hole of the work is horizontal and both ends of the through hole of the work are arranged on the tapered inclined surface side of the work holder. To do. Next, while slidably engaging the pair of ridges of the slide tool with the opposing side portions of the second annular groove of the cap, the inclined surface of the slide tool and the tapered inclined surface of the work holder are brought into contact with each other. Make it in the state of being made. Then, in a state where the inclined surface of the slide tool and the tapered inclined surface of the work holder are in contact with each other, the slide tool and the work holder are moved relative to each other, so that the cap (cap () via the pair of ridges. A force outward in the central axial direction of the through hole acts on the second annular groove), and the cap can be removed from the through hole.

As a result, the work of removing the masking jig (cap) for painting that seals the through hole does not require power such as air or electricity, and the worker holds it in his hand and actually manufactures the product at the factory. The removal work can be performed with almost no work load to the extent that it can be expected to be sufficiently usable. In addition, the removal jig moves the cap outward in the central axis direction of the through hole by using the force applied by the operator in the normal direction of the central axis of the through hole as the point of action on both opposite side portions of the second annular groove. It is configured so that it can be efficiently converted into a force to make it. Therefore, compared to the case where the cap is manually pulled out from the through hole of the work without using the removal jig (when the cap is forcibly pulled out), the attachment / detachment workability is improved and the work load of the operator is reduced. Can be done.

Further, when the coating on the work is electrodeposition coating, the workpiece is dipped in the paint and then baked and dried in a baking furnace (for example, the temperature inside the furnace is about 200 ° C.). Therefore, the work and the masking jig for painting immediately after painting are used. , Both have a high surface. Therefore, if the cap is forcibly pulled out from the through hole of the work without using the removal jig, the worker may get burned. Therefore, remove the masking jig for painting after the surface temperature drops. There is a need to do. On the other hand, if the cap is removed from the through hole using this removal jig, the operator does not have to directly grasp the cap, so that the masking jig for painting can be removed immediately after being discharged from the firing furnace. it can. Therefore, as compared with the case where the removal jig is not used, the painting work efficiency can be improved, and the cost related to the work painting at the time of mass production can be suppressed.

Further, in one of the present inventions, in the set of the masking jig for painting and the removing jig thereof, two slide tools of the removing jig are provided corresponding to both end surfaces of the work holding tool. It is characterized by being.

In the above configuration, two slide tools are provided. Therefore, in the work of removing the masking jig for painting using the removal jig, the inclined surfaces of the two slide tools are brought into contact with the tapered inclined surfaces of the work holder substantially at the same time to form a through hole. The two caps sealed at both ends can be pulled out from the through holes of the work at substantially the same time. Therefore, as compared with the case where two caps are pulled out from the through holes one by one using one slide tool, the workability of attachment / detachment can be further improved and the work load of the operator can be further reduced.

Further, in one of the present inventions, in the set of the masking jig for painting and the removing jig thereof, the fixing means extends in the central axis direction of the through hole, and one of the two caps is centered. It is characterized in that it penetrates so as to be relatively movable in the axial direction and has a shaft member fixed to the other of the two caps.

According to the above configuration, since the shaft member fixed to the other cap penetrates one cap so as to be relatively movable in the central axial direction of the through hole, the central axial direction of the two caps (axial direction of the shaft member). It is possible to prevent the deviation of the inclination with respect to (the two caps can be held in parallel). This makes it possible to prevent the surface pressure applied to the O-ring seal when the caps are attached to both ends of the cylindrical through hole from becoming non-uniform in the circumferential direction. Therefore, high sealing performance can be ensured, and when painting the work, it is possible to prevent the coating disorder at the boundary between the non-painted region and the painted region.

Further, in one of the present inventions, in the set of the masking jig for painting and the removing jig thereof, the fixing means extends in the central axis direction of the through hole, and the two caps are extended in the central axis direction. It is characterized by having a shaft member that penetrates the shaft member so as to be relatively movable.

According to the above configuration, since the shaft member penetrates the two caps so as to be relatively movable in the central axial direction, it is possible to prevent the inclination of the two caps from shifting in the central axial direction (axial direction of the shaft member). (The two caps can be held in parallel). This makes it possible to prevent the surface pressure applied to the O-ring seal when the caps are attached to both ends of the cylindrical through hole from becoming non-uniform in the circumferential direction. Therefore, high sealing performance can be ensured, and when painting the work, it is possible to prevent the coating disorder at the boundary between the non-painted region and the painted region.

Further, one of the present inventions is a set of the masking jig for painting and a jig for removing the masking jig, wherein the fixing means is used.
With the shaft member
It is characterized by having a fixing member which is detachably fixed to a portion of the shaft member which penetrates and protrudes from the cap and can be restricted from moving in a direction in which the two caps are separated from each other.

According to the above configuration, the fixing member is detachably fixed to the protruding portion through one cap of the shaft member, so that the fixing member can be easily attached and detached. As a result, the workability of attaching and detaching the masking jig for painting can be improved.

Further, one of the present inventions is a set of the masking jig for painting and a jig for removing the masking jig, wherein the shaft member has a screw groove formed at least in a part in the central axial direction of the through hole.
The fixing member is characterized by being a nut screwed into the thread groove of the shaft member.

According to the above configuration, the fixing member can be easily attached and detached only by unscrewing the nut and the screw groove. As a result, the workability of attaching and detaching the masking jig for painting can be further improved.

Further, in one of the present inventions, in the set of the masking jig for painting and the removing jig thereof, the two caps are made of metal.
The O-ring seal is formed of a rubber composition containing any of silicone rubber, fluororubber, and nitrile rubber.
The fixing member is a bag nut,
It is characterized in that an energization path leading to the work is formed through one of the two caps.

According to the above configuration, direct energization can be performed between one of the two caps and the work. Therefore, a masking jig for painting can be used for painting to charge the work.
Further, since the O-ring seal is formed of a rubber composition containing any one of silicone rubber, fluororubber, and nitrile rubber, it has excellent heat resistance. Further, since the fixing member is a bag nut, even if the work on which the masking jig for painting is attached is immersed in the paint, it is possible to prevent the paint from infiltrating and adhering to the non-painted region. From these, a masking jig for coating can be used for electrodeposition coating.

Further, the present invention is intended for a work having a through hole having a convex portion protruding inward in the radial direction on a cylindrical inner peripheral surface, and prevents paint from adhering to the inner peripheral surface of the through hole. Therefore, it is a removal jig for a masking jig for painting that seals both ends of the through hole.
The masking jig for painting is
The first annular groove formed on the outer peripheral surface and
The first annular groove is formed on the outer side of the through hole in the central axial direction, and is arranged on the outer side of the through hole in the central axial direction from both end faces of the through hole when both ends of the through hole are sealed. 2 annular grooves and
An O-ring seal fitted in the first annular groove and
With two caps, and
A force is applied to the two caps in a direction approaching each other so that the two caps both abut on the convex portion of the through hole, or at least one of the two caps is the cap and the convex portion. Each O-ring seal of the two caps is in contact with the convex portion via a spacer arranged between the portions, and is sealed between the first annular groove and the inner peripheral surface of the through hole. Fixing means for fixing the relative positions of the two caps in the closed state,
Is equipped with
The removal jig
A work holder and a slide tool for holding the work so that the central axis direction of the through hole is horizontal are provided.
The work holder is
Both end faces of the held work located in the central axis direction of the through hole are formed in a shape in which the taper angle formed by the normal direction of the central axis is in the range of 1 ° or more and less than 45 °. Includes a tapered slope,
The slide tool
A pair extending in a direction parallel to the normal direction of the central axis of the through hole and facing each other so that the opposite side portions of the second annular groove formed on the outer peripheral surface of the cap can be slidable. The ridges and
It has an inclined surface having a shape inclined with respect to the normal direction of the central axis at an angle substantially equal to the taper angle of the tapered inclined surface of the work holder.
The pair of ridges of the slide tool are slidably engaged with the opposite side portions of the second annular groove of the cap, and the inclined surface of the slide tool and the tapered inclination of the work holder. It is characterized in that the cap of the masking jig for painting is removed from the through hole by relatively moving each other in a state of being in contact with the surface.

By using the coating masking jig removal jig having the above configuration, the coating masking jig (cap) having the through hole sealed can be removed from the through hole more easily. Specifically, first, the work is held by the work holder so that the central axis direction of the through hole of the work is horizontal and both ends of the through hole of the work are arranged on the tapered inclined surface side of the work holder. To do. Next, while slidably engaging the pair of ridges of the slide tool with the opposing side portions of the second annular groove of the cap, the inclined surface of the slide tool and the tapered inclined surface of the work holder are brought into contact with each other. Make it in the state of being made. Then, in a state where the inclined surface of the slide tool and the tapered inclined surface of the work holder are in contact with each other, the slide tool and the work holder are moved relative to each other, so that the cap (cap () via the pair of ridges. A force outward in the central axial direction of the through hole acts on the second annular groove), and the cap can be removed from the through hole.

As a result, the work of removing the masking jig (cap) for painting that seals the through hole does not require power such as air or electricity, and the worker holds it in his hand and actually manufactures the product at the factory. The removal work can be performed with almost no work load to the extent that it can be expected to be sufficiently usable. In addition, the removal jig moves the cap outward in the central axis direction of the through hole by using the force applied by the operator in the normal direction of the central axis of the through hole as the point of action on both opposite side portions of the second annular groove. It is configured so that it can be efficiently converted into a force to make it. Therefore, compared to the case where the cap is manually pulled out from the through hole of the work without using the removal jig (when the cap is forcibly pulled out), the attachment / detachment workability is improved and the work load of the operator is reduced. Can be done.

Further, the present invention is intended for a work having a through hole having a convex portion protruding inward in the radial direction on a cylindrical inner peripheral surface, and prevents paint from adhering to the inner peripheral surface of the through hole. Therefore, it is a masking jig for painting that seals both ends of the through hole and is removable from the sealed through hole by a removal jig.
The masking jig for painting is
The first annular groove formed on the outer peripheral surface and
The first annular groove is formed on the outer side of the through hole in the central axial direction, and is arranged on the outer side of the through hole in the central axial direction from both end faces of the through hole when both ends of the through hole are sealed. 2 annular grooves and
An O-ring seal fitted in the first annular groove and
With two caps, and
A force is applied to the two caps in a direction approaching each other so that the two caps both abut on the convex portion of the through hole, or at least one of the two caps is the cap and the convex portion. Each O-ring seal of the two caps is in contact with the convex portion via a spacer arranged between the portions, and is sealed between the first annular groove and the inner peripheral surface of the through hole. Fixing means for fixing the relative positions of the two caps in the closed state,
Is equipped with
The removal jig
A work holder and a slide tool for holding the work so that the central axis direction of the through hole is horizontal are provided.
The work holder is
Both end faces of the held work located in the central axis direction of the through hole are formed in a shape in which the taper angle formed by the normal direction of the central axis is in the range of 1 ° or more and less than 45 °. Includes a tapered slope,
The slide tool
A pair extending in a direction parallel to the normal direction of the central axis of the through hole and facing each other so that the opposite side portions of the second annular groove formed on the outer peripheral surface of the cap can be slidable. The ridges and
It has an inclined surface having a shape inclined with respect to the normal direction of the central axis at an angle substantially equal to the taper angle of the tapered inclined surface of the work holder.
The pair of ridges of the slide tool are slidably engaged with the opposite side portions of the second annular groove of the cap, and the inclined surface of the slide tool and the tapered inclination of the work holder. It is characterized in that the cap of the masking jig for painting is removed from the through hole by relatively moving each other in a state of being in contact with the surface.

By using the coating masking jig having the above configuration, the coating masking jig (cap) having the through hole sealed can be removed from the through hole more easily. Specifically, first, the work is held by the work holder so that the central axis direction of the through hole of the work is horizontal and both ends of the through hole of the work are arranged on the tapered inclined surface side of the work holder. To do. Next, while slidably engaging the pair of ridges of the slide tool with the opposing side portions of the second annular groove of the cap, the inclined surface of the slide tool and the tapered inclined surface of the work holder are brought into contact with each other. Make it in the state of being made. Then, in a state where the inclined surface of the slide tool and the tapered inclined surface of the work holder are in contact with each other, the slide tool and the work holder are moved relative to each other, so that the cap (cap () via the pair of ridges. A force outward in the central axial direction of the through hole acts on the second annular groove), and the cap can be removed from the through hole.

As a result, the work of removing the masking jig (cap) for painting that seals the through hole does not require power such as air or electricity, and the worker holds it in his hand and actually manufactures the product at the factory. The removal work can be performed with almost no work load to the extent that it can be expected to be sufficiently usable. In addition, the removal jig moves the cap outward in the central axis direction of the through hole by using the force applied by the operator in the normal direction of the central axis of the through hole as the point of action on both opposite side portions of the second annular groove. It is configured so that it can be efficiently converted into a force to make it. Therefore, compared to the case where the cap is manually pulled out from the through hole of the work without using the masking jig for painting (when the cap is forcibly pulled out), the workability of attachment / detachment is improved and the work load of the operator is reduced. can do.

It is sectional drawing which shows the state which the masking jig for painting which concerns on 1st Embodiment is attached to a work. It is sectional drawing of the work used in 1st Embodiment. It is sectional drawing which shows the state which the masking jig for painting which concerns on the modification of 1st Embodiment is attached to a work. It is a four-sided view of the work holder of the removal jig which concerns on 1st Embodiment, and is a sectional view taken along line AA. 3 is a three-view view of the first slide tool of the removal jig according to the first embodiment, and is a sectional view taken along line AA. 3 is a three-view view of the second slide tool of the removal jig according to the first embodiment, and is a sectional view taken along line AA. It is explanatory drawing of the removal form (a) of the masking jig for painting using the removal jig. It is explanatory drawing of the removal form (a) of the masking jig for painting using the removal jig (AA sectional view of FIG. 7). It is explanatory drawing of the removal form (a) of the masking jig for painting using the removal jig (the cross-sectional view of BB of FIG. 7). It is an enlarged view of the part surrounded by the one-dot chain line of FIG. 8 in a circle. It is an enlarged view of the part surrounded by the one-dot chain line of FIG. It is explanatory drawing of the removal form (b) of the masking jig for painting using the removal jig. It is explanatory drawing of the removal form (b) of the masking jig for painting using the removal jig (AA cross-sectional view of FIG. 12). It is explanatory drawing of the removal form (b) of the masking jig for painting using the removal jig (the cross-sectional view of BB of FIG. 12). It is sectional drawing which shows the state which the masking jig for painting which concerns on 2nd Embodiment is attached to a work.

(First Embodiment)
Hereinafter, the masking jig 1 for painting and the removing jig 2 thereof according to the first embodiment of the present invention will be described.

FIG. 1 shows a state in which the masking jig 1 for painting of the present embodiment is mounted in the through hole 51 of the work 50. The coating masking jig 1 is for preventing the paint from adhering to the inner peripheral surface (non-painted region 53, which will be described later) of the through hole 51 of the work 50. The masking jig 1 for painting of the present embodiment is also used when painting that does not charge the work 50 or painting that charges the work 50.

Here, examples of the coating that does not charge the work 50 include immersion coating, spray coating, hand coating, and baking coating. Further, examples of the coating for charging the work 50 include electrodeposition coating, electrostatic coating, and electrostatic powder coating. The type of electrodeposition coating is preferably cationic electrodeposition coating having excellent corrosion resistance, but anionic electrodeposition coating may also be used. Electrodeposition coating is the process of immersing an object to be coated in a water-soluble resin paint and passing a DC current between the object to be coated and an electrode to charge the object to be coated and the paint to different polarities (cathode in the case of cationic electrodeposition). Is a coating method in which a coating film is formed on the surface of the object to be coated by an electrolysis reaction, and then the object to be coated is pulled up from the paint and baked and dried. Electrostatic coating is a coating method in which an object to be coated and a mist-like paint are charged with different polarities, and the paint is attached to the object to be coated by static electricity. Electrostatic powder coating is a coating method in which an object to be coated and a powdery coating material are charged with different polarities, the coating material is adhered to the object to be coated by static electricity, and then heated to form a coating film.

(Work 50)
As shown in FIGS. 1 and 2, the work 50 on which the coating masking jig 1 of the present embodiment is mounted is a tubular member. The work 50 is, for example, a pulley component. Then, the work 50 is formed with a through hole 51 having a cylindrical inner peripheral surface. The central axis 52 of the through hole 51 extends linearly. In the following description, the direction of the central axis 52 of the through hole 51 is simply referred to as an axial direction (central axis direction). Further, the through hole 51 is formed with a convex portion 54 protruding inward in the radial direction at a central portion of the through hole 51 (a position substantially equally separated in the axial direction from both end faces of the through hole 51). The details of the convex portion 54 formed in the through hole 51 of the work 50 of the present embodiment will be described later, but when the masking jig 1 for painting is attached to the through hole 51 of the work 50, two of them will be described later. Both the caps (first cap 11, second cap 12) have a structure in which they come into direct contact with the convex portion 54.

In such a work 50, the outer peripheral surface and the both end surfaces in the axial direction of the work 50 are painting areas where painting is applied with the masking jig 1 for painting mounted on the through holes 51. On the other hand, in the work 50, the inner peripheral surface including the convex portion 54 of the through hole 51 is a non-painted region 53 in which the coating masking jig 1 is attached to the through hole 51 and is not painted. The non-painted area 53 may be painted in a state where the masking jig 1 for painting is not attached to the work 50. Further, the unpainted area 53 may be a range narrower in the axial direction than the range shown in FIG.

(Masking jig for painting 1)
The coating masking jig 1 is attached to the through hole 51 of the work 50 and is used to seal the through hole 51. The masking jig 1 for painting has two caps (first cap 11, second cap 12), a shaft member 13, and a nut 14 (fixing member).

(cap)
The first cap 11 has a cylindrical shape corresponding to the shape of the end face of the through hole 51. The outer diameter of the first cap 11 is substantially the same as or slightly smaller than the inner diameter of the through hole 51. An annular first annular groove 111 is formed on the outer peripheral surface of the first cap 11 so as to be parallel to the end surface of the through hole 51 when the first cap 11 is attached to the through hole 51. The first annular groove 111 is arranged axially inward from the end surface of the through hole 51 when the first cap 11 is attached to the through hole 51 and the bottom portion of the first cap 11 abuts on the convex portion 54. It is formed like this. An O-ring seal 113 is fitted in the first annular groove 111. Further, on the outer peripheral surface of the first cap 11, an annular second annular groove 112 is formed axially outward from the first annular groove 111. The second annular groove 112 is arranged axially outward from the end surface of the through hole 51 when the first cap 11 is attached to the through hole 51 and the bottom portion of the first cap 11 abuts on the convex portion 54. It is formed like this. Further, the first cap 11 is formed with a shaft hole 114 penetrating in the axial direction.

Like the first cap 11, the second cap 12 also has a cylindrical shape corresponding to the shape of the end face of the through hole 51. The outer diameter of the second cap 12 is substantially the same as or slightly smaller than the inner diameter of the through hole 51. Similar to the first cap 11, the first annular groove 121 and the second annular groove 122 are formed on the outer peripheral surface of the second cap 12. An O-ring seal 123 is fitted in the first annular groove 121. Further, the second annular groove 122 is arranged axially outward from the end surface of the through hole 51 when the second cap 12 is attached to the through hole 51 and the bottom portion of the second cap 12 abuts on the convex portion 54. It is formed so as to. Further, one end of the shaft member 13 is fixed to the bottom of the second cap 12.

The materials of the first cap 11 and the second cap 12 may be made of a hard resin such as nylon resin, ultra-high molecular weight polyethylene resin, polyacetal resin, or the like in the case of coating that does not charge the work 50. It may be made of. On the other hand, in the case of painting in which the work 50 is charged, the first cap 11 and the second cap 12 are formed of a conductive metal. The type of metal is preferably an aluminum alloy, which is lighter in weight than iron, less corrosive, easier to cut, and general-purpose, but other conductive metals (for example, steel) may also be used.

The O-ring seals 113 and 123 are made of elastic members and are formed so that the cross-sectional diameter thereof is slightly larger than the depth of the second annular grooves 112 and 122. Therefore, when the O-ring seals 113 and 123 are fitted into the second annular grooves 112 and 122, the O-ring seals 113 and 123 slightly protrude (bulge) from the outer peripheral surfaces of the first cap 11 and the second cap 12. ) Will be held in the state.

For the O-ring seals 113 and 123, general-purpose products conforming to the regulations of JIS B2401-1 are used. Examples of the materials for the O-ring seals 113 and 123 include chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), hydride nitrile rubber (H-NBR), styrene butadiene rubber (SBR), and ethylene-propylene diene monomer (EPDM). ), Silicone rubber (Si, Q), fluororubber (FKM), urethane rubber (U) and the like as main components can be adopted. The material of the O-ring seals 113 and 123 is not limited to the above rubber composition, and may be, for example, a highly elastic material such as a thermoplastic elastomer or a thermosetting elastomer. In the case of coating involving a baking step such as electrodeposition coating or baking coating, the material of the O-ring seals 113 and 123 is preferably silicone rubber, fluororubber, nitrile rubber or the like having excellent heat resistance. Among them, silicone rubber is particularly preferable from the viewpoint of balance of quality, cost and handleability.

Regarding the hardness of the O-ring seals 113 and 123, it is preferable that the durometer A hardness of the O-ring seals 113 and 123 is about 70 (JIS B2401-1 compliant). The hardness of Durometer A was measured by JIS K6253-3 in an air atmosphere maintained at room temperature of 23 ° C., and the test piece was manufactured under the same conditions as the O-ring seals 113 and 123 (plate material). It is a value measured using.

(Shaft member 13 and nut 14)
The shaft member 13 extends axially from the bottom of the second cap 12 and penetrates the shaft hole 114 formed in the first cap 11 so as to be relatively movable in the axial direction. A screw groove (not shown) is formed on at least the outer peripheral portion of the outer peripheral surface of the shaft member 13 on the first cap 11 side.

The nut 14 (fixing means) is detachably fixed to the shaft member 13 by being screwed into the screw groove of the portion of the shaft member 13 protruding from the shaft hole 114. By fixing the nut 14 to the shaft member 13 at a position where it abuts on the first cap 11, it is possible to regulate the movement of the first cap 11 and the second cap 12 in a direction in which they are separated from each other. Since the nut 14 is fixed to the thread groove of the shaft member 13 by screwing in this way, the nut 14 can be easily removed from the shaft member 13 simply by unscrewing the nut 14 and the screw groove of the shaft member 13. It can be attached and detached. As a result, the workability of attaching and detaching the masking jig 1 for painting can be improved. In the case of painting by immersion, a bag nut as shown in FIG. 3 may be used for the nut 14. On top of that, a resin flat washer may be arranged between the nut 14 and the first cap 11 in order to further improve the sealing property.

(Removal jig 2)
As shown in FIGS. 7 and 8, the removal jig 2 is a jig for removing the masking jig 1 for painting mounted in the through hole 51 of the work 50. In short, the first cap 11 and the second cap 12 is used to pull out the work 50 from the through hole 51. The removal jig 2 includes a work holder 21 that holds the work 50 so as to be relatively immovable, and two slide tools (first slide tool 22, second slide tool 23) corresponding to both end faces of the work holder 21. (See FIGS. 7 and 8).

(Work holder 21)
As shown in FIG. 4, the work holder 21 holds the tubular work 50 having the masking jig 1 for painting mounted on the through hole 51 so that the axial direction of the through hole 51 is horizontal. It is provided with a U-shaped groove 211. Flangees 212 and 213 for positioning the axial position of the work 50 are formed at both ends of the U-shaped groove 211. Further, the work holder 21 has a taper angle formed on both end surfaces of the through hole 51 of the held work 50 located in the axial direction, which is an angle formed by the normal direction (vertical direction) with respect to the axial direction. The shaped inclined surfaces 214 and 215 are formed. The taper angle of the tapered inclined surfaces 214 and 215 is in the range of 1 ° or more and less than 45 °.

The work holder 21 may be made of metal, but is preferably formed of, for example, a hard resin such as nylon resin, ultra-high molecular weight polyethylene resin, or polyacetal resin. This is because it is necessary to consider the protection of the outer painted surface of the work 50 that comes into contact with the work holder 21, the slidability of the first slide tool 22 and the second slide tool 23, which will be described later, and the wear prevention of both. ..

(1st slide tool 22 and 2nd slide tool 23)
The first slide tool 22 corresponds to the tapered inclined surface 214 of the work holder 21, and the second slide tool 23 corresponds to the tapered inclined surface 215 of the work holder 21.

As shown in FIG. 5, the first slide tool 22 has a pair of ridges 221, 222 extending in the vertical direction and facing each other. The ridges 221, 222 may be formed so as to extend in a direction parallel to the normal direction with respect to the axial direction of the through hole 51 when the work 50 is held by the work holder 21. The axial width of the ridges 221, 222 is slightly smaller than the groove width of the second annular groove 112 so that the first cap 11 can slide with respect to the second annular groove 112. Further, the distance between the ridges 221 and the ridges 222 facing each other is such that the ridges 221 and the ridges 222 slidably sandwich the opposite side portions of the second annular groove 112. Must be kept.

The first slide tool 22 has an inclined surface 223 inclined at an angle substantially equal to the taper angle of the tapered inclined surface 214 of the work holder 21. That is, the angle (tilt angle) formed by the inclined surface 223 with the normal direction (vertical direction) with respect to the axial direction is in a range of 1 ° or more and less than 45 ° corresponding to the taper angle of the tapered inclined surface 214. Is formed in. As a result, when the tapered inclined surface 214 of the work holder 21 and the inclined surface 223 of the first slide tool 22 are brought into contact with each other, the ridges 221, 222 of the first slide tool 22 are brought into contact with the work holder 21. It will be positioned in the direction perpendicular to the axial direction of the through hole 51 of the held work 50.

Further, the first slide tool 22 is provided with a slit 224 for securing a space in which the shaft member 13 protruding from the shaft hole 114 of the first cap 11 can move.

The second slide tool 23 has the same structure as the first slide tool 22 except that the slit 224 is not provided, and has a pair of ridge portions 231 and 232 as shown in FIG. There is. The axial width of the ridges 231 and 232 is slightly smaller than the groove width of the second annular groove 122 so as to be slidable with respect to the second annular groove 122 of the second cap 12. Further, the distance between the ridges 231 and the ridges 232 facing each other is such that the ridges 231 and the ridges 232 can slidably sandwich the opposite side portions of the second annular groove 122. Must be maintained.

The second slide tool 23 has an inclined surface 233 inclined at an angle substantially equal to the taper angle of the tapered inclined surface 215 of the work holder 21. That is, the inclined surface 233 is formed so that the angle formed by the normal direction (vertical direction) with respect to the axial direction is in a range of 1 ° or more and less than 45 ° corresponding to the taper angle of the tapered inclined surface 215. There is. As a result, when the tapered inclined surface 215 of the work holder 21 and the inclined surface 233 of the second slide tool 23 are brought into contact with each other, the ridges 231, 232 of the second slide tool 23 are brought into contact with the work holder 21. It will be positioned in the direction perpendicular to the axial direction of the through hole 51 of the held work 50.

The material of the first slide tool 22 and the second slide tool 23 may be made of metal, but is preferably formed of, for example, a hard resin such as nylon resin, ultra-high molecular weight polyethylene resin, or polyacetal resin. Slidability between the ridges 221-222 (ridges 231 and 232) of the first slide tool 22 (second slide tool 23) and the second annular groove 112 (second annular groove 122) and wear prevention of both. , And the slidability between the tapered inclined surface 214 (tapered inclined surface 215) of the work holder 21 and the inclined surface 223 (inclined surface 233) of the first slide tool 22 (second slide tool 23), and both. This is because it is necessary to consider wear prevention.

(Installation procedure of masking jig 1 for painting)
Next, a procedure for attaching the coating masking jig 1 to the through hole 51 of the work 50 will be described.

First, the bottom of the first cap 11 (the side on which the first annular groove 111 is formed) is fitted into one end of the through hole 51 of the work 50 for mounting. At this time, the O-ring seal 113 fitted in the first annular groove 111 may be arranged axially outward from one end surface of the through hole 51.

Next, while passing the shaft member 13 through the shaft hole 114 of the first cap 11, the bottom portion of the second cap 12 (the side on which the first annular groove 121 is formed) is fitted into the other end of the through hole 51 of the work 50. Installing. At this time, the O-ring seal 123 fitted in the first annular groove 121 may be arranged axially outward from the other end surface of the through hole 51. The order in which the first cap 11 and the second cap 12 are attached may be reversed from the above.

After that, by screwing the nut 14 into the thread groove of the shaft member 13 protruding from the shaft hole 114 of the first cap 11, a force is applied in the direction in which the first cap 11 and the second cap 12 approach each other in the axial direction. As a result, the distance between the first cap 11 and the second cap 12 is shortened. Then, the nut 14 is screwed into the thread groove of the shaft member 13 until the bottom portion of the first cap 11 abuts on the convex portion 54 and the bottom portion of the second cap 12 abuts on the convex portion 54. As a result, the O-ring seal 113 of the first cap 11 is fixed in a sealed state between the first annular groove 111 and the inner peripheral surface of the through hole 51, and the O-ring seal 123 of the second cap 12 is fixed. Is fixed in a sealed state between the first annular groove 121 and the inner peripheral surface of the through hole 51 (the relative positions of the first cap 11 and the second cap 12 are fixed).

It is preferable to use a torque wrench to tighten the nut 14. By setting the tightening torque of the torque wrench after determining the appropriate tightening torque, uniform tightening can always be achieved. As a result, high sealing performance can be ensured, excessive force can be prevented from being applied to the first cap 11, the second cap 12, and the convex portion 54, and premature sagging of the first cap 11 and the second cap 12 can be prevented. it can.

According to the above configuration, since the shaft member 13 fixed to the second cap 12 penetrates the shaft hole 114 of the first cap 11 so as to be relatively movable in the axial direction of the through hole 51, the first cap 11 and the second cap 11 and the second cap 11 It is possible to prevent the inclination of the cap 12 from being displaced with respect to the axial direction (the direction of the central axis 52) (the first cap 11 and the second cap 12 can be held in parallel). As a result, it is possible to prevent the surface pressure applied to the O-ring seals 113 and 123 when the first cap 11 and the second cap 12 are attached to both ends of the cylindrical through hole 51 to be non-uniform in the circumferential direction. Therefore, high sealing performance can be ensured, and when painting the work 50, it is possible to prevent the coating disorder at the boundary between the non-painted region 53 and the painted region.

(Procedure for removing the masking jig 1 for painting using the removal jig 2: Removal form (a))
(1) First, the work 50 after painting is set in the U-shaped groove 211 of the work holder 21 so that the axial direction of the through hole 51 is horizontal. At this time, the work 50 is housed between the flanges 212 and the flanges 213 formed at both ends of the U-shaped groove 211. As a result, the work 50 is fixed to the work holder 21 so as not to be relatively movable.

(2) Next, after loosening the nut 14 (unscrewing the nut 14 and the thread groove of the shaft member 13) and removing the nut 14 from the shaft member 13, as shown in FIG. 7, the first The pair of ridges 221, 222 provided on the slide tool 22 are slidably engaged with the opposite side portions of the second annular groove 112 of the first cap 11, and the inclined surface 223 of the first slide tool 22. Is slidably abutted against the tapered inclined surface 214 of the work holder 21. Similarly, the second slide tool 23 is slidably engaged with the pair of ridge portions 231, 232 provided on the second slide tool 23 with the opposite side portions of the second annular groove 122 of the second cap 12. The inclined surface 233 of the above is slidably brought into contact with the tapered inclined surface 215 of the work holder 21.

(3) Next, as shown in FIGS. 8 and 9, a force is applied downward to the first slide tool 22 in a state where the work holder 21 is fixedly fixed. That is, with the work holder 21 fixed, the inclined surface 223 of the first slide tool 22 is slid with respect to the tapered inclined surface 214 of the work holder 21. As a result, a force is applied in the direction in which the axial distance between the second annular groove 112 of the first cap 11 and one end surface of the through hole 51 of the work 50 increases, and the force is applied to the first annular groove 111 of the first cap 11. The first cap 11 is pulled out from the through hole 51 by the O-ring seal 113 sealed and arranged between the inner peripheral surface of the through hole 51 and the one end surface of the through hole 51 moving outward in the axial direction. Similarly (preferably at the same time that a downward force is applied to the first slide tool 22), a downward force is applied to the second slide tool 23 with the work holder 21 immovably fixed. That is, with the work holder 21 fixed, the inclined surface 233 of the second slide tool 23 is slid with respect to the tapered inclined surface 215 of the work holder 21. As a result, a force is applied in the direction in which the axial distance between the second annular groove 122 of the second cap 12 and the other end surface of the through hole 51 of the work 50 increases, and the force is applied to the first annular groove 121 of the second cap 12. The second cap 12 is pulled out from the through hole 51 by moving the O-ring seal 123 sealed and arranged between the inner peripheral surface of the through hole 51 and the other end surface of the through hole 51 in the axial direction.

More specifically, when the second cap 12 is pulled out from the through hole 51 by using the second slide tool 23, the work holder 21 is fixedly fixed as shown in FIGS. 10 and 11. When a downward force is applied to the second slide tool 23, the point where the downward force is applied to the second slide tool 23 is the point of effort, and the inclined surface 233 of the second slide tool 23 and the work holder 21 are tapered. A pair of fulcrum points where the inclined surface 215 abuts (a portion where the surface where the inclined surface 233 of the second slide tool 23 and the tapered inclined surface 215 of the work holder 21 abut and the central axis 52 intersect). The opposing side portions of the second annular groove 122 that engages with the ridge portions 231 and 232 of the second cap 12 act as action points, and are between the second annular groove 122 of the second cap 12 and the other end surface of the through hole 51 of the work 50. The inclined surface 233 of the second slide tool 23 moves relative to the tapered inclined surface 215 of the work holder 21 in the direction in which the axial distance (Xs) increases (in the direction in which Xs1> Xs0). At this time, since the pair of ridge portions 231 and 232 are slidably engaged with the opposite side portions of the second annular groove 122, the tapered inclined surface 215 is within the taper angle range (1 °) specified above. As long as the temperature is less than 45 °), the second cap 12 can be efficiently moved outward in the axial direction by the amount of increase in the distance (Xs) without applying an unnecessarily large force to the force point. Therefore, the opposing side portions of the second annular groove 122 that engages the pair of ridge portions 231 and 232 with the force applied by the operator to the second slide tool 23 in the normal direction (vertical direction) with respect to the axial direction. Since the force for moving the second cap 12 outward in the axial direction can be efficiently converted with the above point of action, the workability is good and the second cap 12 can be easily removed from the through hole 51 without imposing a burden on the operator's work. Can be pulled out. As for the first slide tool 22, the first cap 11 can be easily pulled out from the through hole 51 by the same action.

Here, the relative movement amount of the inclined surface 233 of the second slide tool 23 moved along the tapered inclined surface 215 of the work holder 21 is ΔL, the taper angle is θ, and the second cap 12 is outward in the axial direction. Assuming that the movement amount is ΔXc, the movement amount ΔXc can be expressed by the equation (1).
ΔXc = ΔL × sinθ ・ ・ ・ (1)
That is, the second cap 12 moves outward from the through hole 51 in the axial direction by the movement amount ΔXc derived by the equation (1) according to the taper angle θ and the magnitude of the relative movement amount ΔL, and the O-ring. When the seal 123 is decompressed, the second cap 12 may come off the through hole 51. The same applies to the first slide tool 22.

In a state where the first cap 11 (second cap 12) is attached to the through hole 51, the O-ring seal 113 (O-ring seal 123) is arranged at the axial end of the through hole 51. Therefore, when the first cap 11 (second cap 12) moves only slightly outward in the axial direction (for example, when the cross-sectional diameter of the O-ring seals 113 and 123 is about 4 mm and the compression ratio is about 10 to 15%). The required movement amount ΔXc is 1 to 1.5 mm), the compression of the O-ring seal 113 (O-ring seal 123) is released, and the first cap 11 (second cap 12) is removed from the through hole 51. Can be. Therefore, in order to further improve the attachment / detachment workability and further reduce the work load of the operator, the sizes of the taper angle θ and the relative movement amount ΔL need to be set to the minimum necessary values (both). For example, with the setting of θ = 5 ° and ΔL = 15 mm, ΔXc = 1.3 mm).

As described above, in the present embodiment, the taper angle of the tapered inclined surfaces 214 and 215 is in the range of 1 ° or more and less than 45 °. The reason is that when the taper angle is less than 1 °, the force applied by the operator to the other of the work holder 21, the first slide tool 22, and the second slide tool 23 in the normal direction in the axial direction is small. However, in order to pull out the first cap 11 and the second cap 12 from the through hole 51, the inclined surface 223 of the first slide tool 22 (the inclined surface 233 of the second slide tool 23) is inclined in a tapered shape of the work holder 21. Since ΔL must be remarkably increased in the relative movement amount moved along the surfaces 214 and 215 and the removal jig 2 also becomes larger in the height direction, it can be attached and detached as compared with the case where the taper angle is in the above range. It is mentioned that the workability is lowered and the work load of the worker is increased. On the other hand, when the taper angle is 45 ° or more, the force applied to the other of the work holder 21, the first slide tool 22, and the second slide tool 23 in the normal direction of the central axis is applied to the pair of ridges 221. The first cap 11 (second cap 12) is moved outward in the axial direction with the opposite side portions of the second annular groove 112 (second annular groove 122) engaging with 222 (protruding portions 231 and 232) as action points. The taper angle is higher than necessary because the first cap 11, the second cap 12, and the removal jig 2 increase in size in the axial direction of the work 50, as well as the force that cannot be efficiently converted into the force to cause the work 50. One of the inconvenient reasons is that the workability of attachment / detachment is lowered and the work load of the operator is increased as compared with the case where the work load is within the range.

(Procedure for removing the masking jig 1 for painting using the removal jig 2: Removal form (b))
In the above removal procedure (removal form (a)), a procedure of applying a downward force to the first slide tool 22 and the second slide tool 23 while the work holder 21 is fixedly fixed is shown. In the detached form (b), as shown in FIGS. 12 to 14, the first slide tool 22 and the second slide tool 23 are fixedly fixed in the normal direction (vertical direction) with respect to the axial direction (first slide). The tool 22 and the second slide tool 23 may be movable in the axial direction), and a downward force may be applied to the work holder 21. That is, the first slide tool 22 and the second slide tool 23 are fixed in the normal direction (vertical direction) with respect to the axial direction (the first slide tool 22 and the second slide tool 23 are movable in the axial direction). In this state), the tapered inclined surfaces 214 and 215 of the work holder 21 are slid with respect to the inclined surfaces 223 of the first slide tool 22 and the inclined surfaces 233 of the second slide tool 23. As a result, a force is applied in the direction in which the axial distance between the second annular groove 112 of the first cap 11 and one end surface of the through hole 51 of the work 50 increases, and the force is applied to the first annular groove 111 of the first cap 11. The first cap 11 is pulled out from the through hole 51 by the O-ring seal 113 sealed and arranged between the inner peripheral surface of the through hole 51 and the one end surface of the through hole 51 moving outward in the axial direction. Similarly, a force is applied in the direction in which the axial distance between the second annular groove 122 of the second cap 12 and the other end surface of the through hole 51 of the work 50 increases, and the force is applied to the first annular groove 121 of the second cap 12. The second cap 12 is pulled out from the through hole 51 by moving the O-ring seal 123 sealed and arranged between the inner peripheral surface of the through hole 51 and the other end surface of the through hole 51 in the axial direction.

In the configuration of the first embodiment, two slide tools (first slide tool 22 and second slide tool 23) are provided. Therefore, in the work of removing the masking jig 1 for painting using the removal jig 2, the inclined surfaces 223 and 233 of the first slide tool 22 and the second slide tool 23 are tapered, respectively, of the work holder 21. It is possible to bring the two caps (first cap 11 and second cap 12) sealed at both ends of the through hole 51 into contact with the inclined surfaces 214 and 215 substantially simultaneously and pull them out from the through hole 51 of the work 50 substantially simultaneously. it can. Therefore, as compared with the case where two caps (first cap 11 and second cap 12) are pulled out from the through hole 51 one side at a time by using one slide tool, the workability of attachment / detachment is further improved, and the operator's workability is improved. The work load can be further reduced.

(Example of modification of the first embodiment)
Next, the masking jig 1'for painting according to the modified example of the first embodiment will be described with reference to FIG. However, for those having the same configuration as that of the first embodiment, the same reference numerals are used and the description thereof will be omitted as appropriate. This coating masking jig 1'is attached to the through hole 51 of the work 50 and is used when coating the work 50 is charged (electrostatic coating, electrostatic coating, electrostatic powder coating, etc.).

The first cap 11 and the second cap 12'are made of metal. Further, the second cap 12'is a guide pin for installing a pin 71 (a work 50 on which a masking jig 1 for painting is mounted on the pedestal 70) projecting from the suspension pedestal 70 which is energized at the time of immersion. There is a hole 124 into which the hole 124 is inserted. Further, the nut 14 ′ screwed into the screw groove of the portion of the shaft member 13 protruding from the shaft hole 114 is a bag nut. By using the bag nut, even if the work 50 to which the masking jig 1'for painting is attached is immersed in the paint, it is possible to prevent the paint from infiltrating and adhering to the non-painted area 53. In the case of electrodeposition coating or electrostatic powder coating, the O-ring seal 113 and the O-ring seal 123'are formed of a rubber composition containing any of silicone rubber, fluororubber, and nitrile rubber having high heat resistance. It is preferable to be done.

As a result, with a simple configuration in which the first cap 11 and the second cap 12'itself are energizing members, an energizing path from the pin 71 to the work 50 via the second cap 12'can be directly formed, and masking treatment for painting can be performed. The tool 1'can be used for painting to charge the work 50. In the case of electrodeposition coating, an electric current is supplied to the second cap 12'to charge the work 50 for use. Further, in the case of electrostatic coating or electrostatic powder coating, the work 50 is connected to the ground via the work 50 or the first cap 11, and the work 50 is used by charging the positive electrode.

(Second Embodiment)
Next, as shown in FIG. 15, a case where the masking jig 1 for painting according to the first embodiment is mounted in the through hole 251 of the work 250 will be described as the second embodiment.

In the work 250 of the second embodiment, as shown in FIG. 15, the convex portion 254 is formed on the end surface side to which the first cap 11 is mounted, rather than the central portion of the inner peripheral surface of the through hole 251. Is the same as the work 50 of the first embodiment. Therefore, when the first cap 11 is attached to the through hole 251 the bottom portion of the first cap 11 abuts on the convex portion 254, but when the second cap 12 is attached to the through hole 251 the second cap 12 The bottom of the is not in direct contact with the convex portion 254.

Therefore, in the second embodiment, the spacer 15 is arranged between the bottom portion and the convex portion 254 of the second cap 12. The spacer 15 is a tubular rigid body corresponding to the inner peripheral surface of the through hole 251 of the work 250, and is inserted into the through hole 251 so as to abut the convex portion 254. The outer diameter of the spacer 15 is slightly smaller than the inner diameter of the through hole 251. As a result, when the second cap 12 is attached to the through hole 251 the bottom portion of the second cap 12 indirectly abuts on the convex portion 254 via the spacer 15.

(Example of modification of the second embodiment)
Next, a case where the coating masking jig 1 according to the first embodiment is mounted in the through hole 251'of the work 250'will be described as a modified example of the second embodiment.

In the work 250'of the modified example of the second embodiment, the convex portion 254'is formed in the central portion of the inner peripheral surface of the through hole 251', and the convex portion 254'is formed on the first cap 11 and the first cap 11. When the 2 cap 12 is attached to the through hole 251', both the bottom portion of the first cap 11 and the bottom portion of the second cap 12 have a shape (size) that does not directly contact the convex portion 254'(the size). Not shown).

Therefore, in the modified example of the second embodiment, the spacer 16'is arranged between the bottom portion of the first cap 11 and the convex portion 254', and the spacer 15 is arranged between the bottom portion and the convex portion 254'of the second cap 12. It has a configuration in which ´ is arranged. The spacer 15'and the spacer 16'are tubular rigid bodies corresponding to the inner peripheral surface of the through hole 251'of the work 250', and are inserted into the through hole 251' so as to abut the convex portion 254'. Has been done. The outer diameters of the spacer 15'and the spacer 16' are slightly smaller than the inner diameter of the through hole 251'. As a result, when the first cap 11 and the second cap 12 are attached to the through hole 251, the bottom portion of the first cap 11 indirectly abuts on the convex portion 254'via the spacer 16', and the second cap 12 The bottom of the is indirectly in contact with the convex portion 254'via the spacer 15'.

(Other embodiments)
In the work of removing the masking jig 1 for painting using the removal jig 2, the first slide tool 22 and the second slide tool 23 are used, and the respective inclined surfaces 223 and 233 are tapered to each other of the work holder 21. In the case where the first cap 11 and the second cap 12 are pulled out from the through hole 51 of the work 50 substantially at the same time by contacting the surfaces 214 and 215 substantially at the same time, the tapered inclined surface 214 and the tapered inclined surface 215 As long as the surfaces are inclined in opposite directions and the taper angle is within the range of 1 ° or more and less than 45 °, the taper angles of both the tapered inclined surface 214 and the tapered inclined surface 215 are different values ( Absolute value) may be provided.

Further, a force is applied to the work holder 21, the first slide tool 22, the second slide tool 23, and the other of the work holder 21, the first slide tool 22, and the second slide tool 23. The direction of addition is not limited to the vertical direction (vertical direction). As long as a force is applied in a direction in which the axial distance between the second annular groove 112 (second annular groove 122) and the end surface of the through hole 51 of the work 50 increases, the work holder 21 and the first slide tool 22. The direction in which one of the second slide tool 23 is immobile and the direction in which the force is applied to the other of the work holder 21, the first slide tool 22, and the second slide tool 23 are normal directions with respect to the axial direction. It can be in any direction.

Further, if the tapered inclined surfaces 214 and 215 of the work holder 21 can come into contact with the inclined surfaces 223 of the first slide tool 22 and the inclined surfaces 233 of the second slide tool 23, the entire surface of both end faces in the axial direction. The inclined surface 223 of the first slide tool 22 and the inclined surface 233 of the second slide tool 23 may be formed not only on a part of the surface but only on a part of the end surface of the first slide tool 22. You may be.

Further, one slide tool (first slide tool 22) may be used to pull out two caps (first cap 11 and second cap 12) from the through hole 51 one by one in order.

In the above embodiment and the modified example thereof, the shaft member 13 has a configuration in which the shaft member 13 penetrates the shaft hole 114 of the first cap 11 and is fixed to the second cap 12, but the shaft member 13 has the first cap 11 And the second cap 12 may be penetrated so as to be relatively movable in the axial direction. In this case, screw grooves are provided at both ends of the shaft member 13, and a shaft hole having a screw groove formed through the second cap 12 in the axial direction is also provided, and one end of the shaft member 13 protruding from the shaft hole 114. The nut 14 is screwed into the screw groove, and the screw groove at the other end of the shaft member 13 is screwed into the screw groove of the shaft hole provided in the second cap 12 (adjusting the screwing distance) to adjust the shaft. The member 13 is movable relative to both the first cap 11 and the second cap 12.

According to the above configuration, since the shaft member 13 penetrates both the first cap 11 and the second cap 12 so as to be relatively movable in the axial direction, the axial direction of the first cap 11 and the second cap 12 (central axis 52). It is possible to prevent the inclination from shifting with respect to the direction (direction) (the first cap 11 and the second cap 12 can be held in parallel). As a result, it is possible to prevent the surface pressure applied to the O-ring seals 113 and 123 when the first cap 11 and the second cap 12 are attached to both ends of the cylindrical through hole 51 to be non-uniform in the circumferential direction. Therefore, high sealing performance can be ensured, and when painting the work 50, it is possible to prevent the coating disorder at the boundary between the non-painted region 53 and the painted region.

Next, seven evaluation items, which will be described later, were evaluated with respect to the usage modes of the masking jig for painting and the removal jig according to Example 1, Example 2, Reference Example 1 and Reference Example 2.

In the first and second embodiments, the coating masking jig 1 ′ according to the modification of the first embodiment is used to perform coating to charge the work 50 (electrodeposition coating). This is a usage mode of the jig 1'and the removal jig 2. A specific configuration will be described below.

The work 50 was a pulley part obtained by cutting the steel material S45C. The axial length of the unpainted region 53 of the work 50 is about 39 mm, and the portion of the unpainted region 53 where the O-ring seal 113 of the first cap 11 and the O-ring seal 123'of the second cap 12'are arranged. The diameter was 42 mm. The weight of the work 50 is 350 g.

The first cap 11 and the second cap 12'of the masking jig 1'for painting were made by machining (cutting) a solid aluminum material made of metal (aluminum alloy: A2026). The total length (thickness) of the first cap 11 and the second cap 12'in the axial direction was about 22 mm. The O-ring seal 113 and O-ring seal 123'are general-purpose products (JIS B2401-1 compliant, manufactured by Misumi, product number: NPS-35.5) (material: silicone rubber, cross section in a state where no external force is applied). The diameter and inner diameter are 3.5 mm and about 35 mm, respectively, and the durometer A hardness: about 70). Then, the first cap 11 (second cap 12') is attached to the through hole 51 of the work 50, and the O-ring seal 113 (O-ring seal 123') becomes the first annular groove 111 (first annular groove 121'). The compression ratio of the O-ring seal 113 (O-ring seal 123') in a compressed state, which is sealed and arranged between the inner peripheral surface of the through hole 51, is about 14% (= compression ratio: 0.5 mm /). The cross-sectional diameter was 3.5 mm). The second cap 12'is provided with a hole 124 into which a pin 71 projecting from the suspension pedestal 70, which is energized during immersion, is inserted. The nut 14'screwed into the shaft member 13 is a bag nut.

Further, the total weight of the masking jig 1'for painting, that is, the first cap 11 provided with the O-ring seal 113, the second cap 12' provided with the O-ring seal 123', the shaft member 13 and the nut 14'. The total weight of the (bag nut) is 160 g.

The work holder 21 of the removal jig 2 was manufactured by machining (cutting out) a solid nylon resin (specific gravity 1.15) in consideration of heat resistance. The weight of the work holder 21 is 250 g. The taper angle of the tapered inclined surfaces 214 and 215 of the work holder 21 was set to 4 °. Like the work holder 21, the first slide tool 22 and the second slide tool 23 were also manufactured by machining (cutting out) a solid nylon resin (specific gravity 1.15). The weight of the first slide tool 22 and the second slide tool 23 is 200 g, respectively. The inclination angles of the inclined surface 223 and the inclined surface 233 of the first slide tool 22 and the second slide tool 23 were set to 4 °.

(Procedure for removing the masking jig 1'for painting using the removal jig 2)
Regarding the procedure for removing the masking jig 1'for painting using the removal jig 2, in the first embodiment, the "removal form (a)" described in the first embodiment above (before removal: FIG. 7, after removal). : The procedure shown in FIGS. 8 and 9) was performed. On the other hand, in Example 2, the procedure of "removal form (b)" (before removal: FIG. 12, after removal: FIGS. 13 and 14) described in the first embodiment was performed. In Example 2, a linear guide (guide rail & guide block) was used as an incidental jig.

(Example 1: Removal form (a))
(1) Painting with the work holder 21 installed on the workbench so that the tapered inclined surface 214 and the tapered inclined surface 215 have an inverted V shape when viewed from the worker side (front). The work 50 after painting is completed with the masking jig 1'attached to the work holder 21 is held in a U-shaped groove 211 of the work holder 21 so as to be relatively immovable so that the axial direction of the through hole 51 is horizontal. It was set (see FIG. 7). Regarding the top-bottom relationship, the work 50 is the top (on the paper) and the work holder 21 is the ground (below the paper).

(2) Loosen the bag nut 14', remove the bag nut 14'from the shaft member 13, and then attach the pair of ridges 221, 222 provided on the first slide tool 22 to the second ring of the first cap 11. The inclined surface 223 of the first slide tool 22 was slidably contacted with the tapered inclined surface 214 of the work holder 21 while being slidably engaged with the opposite side portions of the groove 112. At about the same time, the pair of ridges 231, 232 provided on the second slide tool 23 are slidably engaged with the opposite side portions of the second annular groove 122'of the second cap 12', and the second 2 The inclined surface 233 of the slide tool 23 was slidably brought into contact with the tapered inclined surface 215 of the work holder 21 (see FIG. 7).

(3) With the work holder 21 fixedly fixed, the first slide tool 22 and the second slide tool 23 were pushed down in the direction of gravity almost simultaneously (a force was applied downward on the paper surface in FIG. 8). That is, with the work holder 21 fixed, the inclined surface 223 of the first slide tool 22 and the inclined surface 233 of the second slide tool 23 are slid against the tapered inclined surfaces 214 and 215 of the work holder 21. I made it move. As a result, the first cap 11 and the second cap 12'were pulled out from the through hole 51 substantially simultaneously (see FIG. 8).

When the removal jig 2 is installed on a general workbench, this "pushing down" operation in the direction of gravity reverses the tapered inclined surfaces 214 and 215 of the work holder 21 (V-shape). It is preferable in that the workability is good and the work load on the operator can be reduced, rather than the operation of "pushing up" against gravity. In any case, the force applied by the operator to the first slide tool 22 and the second slide tool 23 in the normal direction (vertical direction) with respect to the axial direction is engaged with the pair of ridges 221, 222. The first cap 11 and the second cap 12 have the opposite side portions of the second annular groove 112 as the point of action and the opposite side portions of the second annular groove 122 ′ engaging with the pair of ridges 231, 232 as the point of action. Since ´ can be efficiently converted into a force that moves outward in the axial direction, when painting a work piece during mass production, the cap with a forcible removal structure may be forcibly pulled out from the through hole without using the removal jig 2. In comparison, the workability for putting on and taking off was improved, and the work load on the operator could be reduced.

(Actual value of pulling out operation of 1st cap 11 and 2nd cap 12'of Example 1)
・ Taper angle θ: 4 °
-Relative movement amount of the first slide tool 22 (second slide tool 23) ΔL: 20 mm
Amount of movement of the first cap 11 (second cap 12') outward in the axial direction ΔXc (required amount): 0.9 mm
-Movement amount ΔXc (target value): The above required amount + α
-Movement amount ΔXc (= ΔL × sinθ): 1.4 mm> 0.9 mm (required amount)

(Example 2: Removal form (b))
(1) First, a set of linear guides (one guide rail and two guide blocks) of ancillary jigs were laid on the workbench (see FIG. 13). The linear guide is configured such that two guide blocks are engaged with one guide rail and can move linearly along the guide rail. Then, the inclined surface 223 of the first slide tool 22 and the inclined surface 233 of the second slide tool 23 face each other in the extending direction of the linear guide rail, and the inclined surface 223 and the inclined surface 233 are orthogonal to the linear guide rail. The first slide tool 22 and the second slide tool 23 were fixed on the guide block by screwing or the like so as to form a V shape when viewed from the worker side (front) in the direction of movement. In this state, the first slide tool 22 and the second slide tool 23 are in a state of being linearly movable only in the direction along the guide rail.

Next, regarding the masking jig 1'for painting mounted on the through hole 51 of the work 50 after the painting is completed, the bag nut 14'is loosened, the bag nut 14'is removed from the shaft member 13, and then the first cap is used. The opposite side portions of the second annular groove 112 of 11 were slidably engaged with the pair of ridge portions 221, 222 provided on the first slide tool 22. Approximately at the same time, the opposite side portions of the second annular groove 122'of the second cap 12' are slidably engaged with the pair of ridges 231, 232 provided on the second slide tool 23. did.

(2) The U-shaped groove 211 portion of the work holder 21 is placed on the upper part of the work 50 so that the tapered inclined surface 214 and the tapered inclined surface 215 are V-shaped when viewed from the worker side (front). The work holder 21 so that the tapered inclined surfaces 214 and 215 of the work holder 21 slidably contact the inclined surface 223 of the first slide tool 22 and the inclined surface 233 of the second slide tool 23 while being covered. Was set on the work 50. Regarding the top-bottom relationship, the work holder 21 is the top (on the paper) and the work 50 is the ground (below the paper).

(3) The work holder 21 was pushed down in the direction of gravity (a force was applied downward on the paper surface in FIG. 13). That is, the tapered inclined surfaces 214 and 215 of the work holder 21 were slid with respect to the inclined surface 223 of the first slide tool 22 and the inclined surface 233 of the second slide tool 23. As a result, the first cap 11 and the second cap 12'were pulled out from the through hole 51 substantially simultaneously (see FIG. 13). The first slide tool 22 and the second slide tool 23 moved in directions to separate from each other on the guide rail as the first cap 11 and the second cap 12'were pulled out from the through hole 51.

In the case of the second embodiment (removal form (b)), the workability is good and the work load on the operator can be reduced in the work painting at the time of mass production to the same extent as in the first embodiment (removal form (a)). there were. The actual values of the pulling operation of the first cap 11 and the second cap 12'of the second embodiment were the same as those of the first embodiment.

(Evaluation of Example 1, Example 2, Reference Example 1, Reference Example 2)
Next, the usage mode of the painting masking jig and the removing jig (removing form (a)) of the first embodiment, and the painting masking jig and the removing jig (removing form (b)) of the second embodiment. Each usage mode was evaluated. In addition, as a reference object, with the same masking jig for painting as in the first embodiment attached to the through hole of the work, the operator manually operates the first cap and the second cap without using the removal jig. Reference Example 1 is the usage mode when the masking jig is forcibly pulled out in the above, and Reference Example 2 is the usage mode of the masking jig for painting given in the third embodiment modification example of Patent Document 1 (see FIG. 6 of Patent Document 1). Each was evaluated as.

(Evaluation method, evaluation items, evaluation criteria)
Specifically, cationic electrodeposition coating was performed using the masking jigs for coating of Example 1, Example 2, Reference Example 1 and Reference Example 2. As a pretreatment for electrodeposition coating, degreasing, washing with water, surface adjustment of the substrate, formation of a chemical conversion film (formation of a zinc phosphate film), and washing with water were performed in this order. The water-soluble resin coating material used for electrodeposition coating is an aqueous solution obtained by adding amine to an epoxy resin and neutralizing it with an acid. After electrodeposition coating, washing with water and baking drying (160 ° C. × 30 minutes) were performed.

The above-mentioned series of electrodeposition coating treatments were performed on 50 workpieces for each coating masking jig. After that, the following seven evaluation items (1) to (7) were evaluated. The work of attaching and detaching the masking jig for painting to the work was performed in an environment of 23 ° C. ± 2 ° C. The bag nut was tightened with a torque wrench. The nominal screw diameter of the shaft member was M6, and the tightening torque with a torque wrench was set to 1.2 Nm (with a feeling of response).

(1) Misalignment of the seal member Before removing the masking jig for painting from the work, the misalignment of the seal member (O-ring seals of the first cap and the second cap, etc.) was visually confirmed. Even at the 50th item (or its vicinity), if there is no misalignment, the evaluation is "○", if there is a slight (partial) misalignment, the evaluation is "△", and if there is a misalignment. Was evaluated as "x".

(2) Sealing property After removing the masking jig for painting from the work, it was visually confirmed whether or not the paint had invaded the non-painted area of the work. Even at the 50th item (or its vicinity), if there is no intrusion, the evaluation is "○", if there is slight intrusion (partial bleeding, etc.), the evaluation is "△", and if the invasion is remarkable, the evaluation is "○". The evaluation was "x".

(3) Disturbance of coating boundary After removing the masking jig for coating from the work, the presence or absence of distorted coating (bleeding, fading, etc.) at the boundary between the non-painted area and the painted area of the work was visually confirmed. Even at the 50th item (or its vicinity), if there is no disturbance, the evaluation is "○", if there is a slight (partial) disturbance, the evaluation is "△", and if there is a significant disturbance, the evaluation is "○". × ”.

(4) Defects in the masking jig for painting After removing the masking jig for painting from the work, it was visually confirmed whether or not there was a defect in the masking jig for painting. Even for the 50th item (or its vicinity), if there are no defects, the evaluation is "○", and if there are minor (reusable) defects, the evaluation is "△". For example, the first cap and the second cap If there is a non-reusable defect such as a crack, crack, or dent, the evaluation is "x". The life of the O-ring seal is included in this evaluation item.

(5) Detachment workability and work load during attachment / detachment The workability and work load when the worker attaches / detaches the masking jig for painting to / from the work were evaluated. At the stage when the 50th (or its vicinity) attachment / detachment work is completed, the attachment / detachment workability is good from beginning to end, and there is almost no work load, and it can be sufficiently used when actually manufacturing the product at the factory. Evaluation "○" if it can be expected to be possible, evaluation if it feels that the work load is slightly reduced and the work load is increased compared to the first time within the range that can be used when actually manufacturing the product at the factory. "Δ", and when it was felt that the work load was reduced and the work load was increased compared to the first time, it was evaluated as "x" to the extent that it could not be used when actually manufacturing the product.

(6) Quality of coating film (film thickness, film hardness, adhesion, etc.)
The thickness, hardness, adhesion, etc. of the coating film were measured with respect to the work to which the cationic electrodeposition coating was applied. Even in the 50th item (or its vicinity), if all items are good, the evaluation is "○", and if there are minor defects within the range that can be shipped as a product, the evaluation is "△", and there is a quality defect. In the case, the evaluation was "x". The film thickness was measured with an electromagnetic film thickness meter in accordance with JIS K5400, and a film thickness of 20 μm ± 6 μm was regarded as good (evaluation “◯”). The film hardness was evaluated by a scratch judgment based on JIS K5400, and a pencil scratch value of H or higher was regarded as good (evaluation "○"). Adhesion was evaluated by a grid method based on JIS K5400, and 10 points (100/100) was evaluated as good (evaluation "○"). The coating quality shall be comprehensive including the evaluation items (3) and (6).

(7) Painting costs (seal member costs, work efficiency, etc.)
If the seal member (O-ring seal, etc.) is a general-purpose product or if the painting work efficiency is good (if it can be removed immediately after being discharged from the firing furnace), the evaluation is "○" and the seal member (O-ring seal, etc.) is Although it is a general-purpose product, if the painting work efficiency is not very good (if it cannot be removed immediately after being discharged from the firing furnace), it is evaluated as "△", and if the seal member (O-ring seal, etc.) is a non-general-purpose product, it is evaluated. It was set as "x".

Table 1 shows the evaluation results of each evaluation item for Example 1, Example 2, Reference Example 1 and Reference Example 2.

In Example 1 and Example 2 using the removal jig, all of the above seven evaluation items were evaluated as “◯” regardless of which of the removal forms (a and b). The removal jigs used in Examples 1 and 2 have good workability and are almost workable even when the operator holds them in their hands and actually attaches and detaches 50 masking jigs for painting. It was light enough to be handled without feeling a burden.

The 50th coating masking jig of Reference Example 1 (or its vicinity) has reduced workability for attachment and detachment to the extent that it cannot be used when the operator actually manufactures the product. As a result of feeling that the work load when pulling out the first cap and the second cap from the work has increased, the evaluation of "attachment / detachment workability and work load at the time of attachment / detachment" is "x", and the seal member (O-ring seal) Although it is a general-purpose product, it could not be removed immediately after being discharged from the firing furnace, and as a result, the painting work efficiency was not so good, and as a result, the evaluation of "cost related to painting" was "Δ".

Since the seal member provided in the coating masking jig of Reference Example 2 is a non-general-purpose product, it is compared with the O-ring seal (general-purpose product) provided in the coating masking jig of Example 1 and Example 2. As a result of the procurement cost being about four times higher, the evaluation of "cost related to painting" was "x".

(Obtained effect)
(1) Suppression of Misalignment of Seal Member The masking jig for painting of Example 1 and Example 2 fixes the relative position between the first cap and the second cap into which the O-ring seal is fitted. A shaft member 13 and a nut 14'(bag nut) are provided. Therefore, when the coating masking jig is attached to the work in which the convex portion is formed on the inner peripheral surface of the through hole, both the first cap and the second cap are in direct contact with the convex portion, or the first At least one of the cap and the second cap could come into contact with the convex portion via a spacer arranged between the convex portion. As a result, the misalignment of the O-ring seal (seal member) can be reliably suppressed to the extent that there is no misalignment of the O-ring seal in the axial direction.

(2) Suppression of cost related to work coating during mass production The O-ring seal (general-purpose product) provided in the coating masking jigs of Example 1 and Example 2 is provided in the coating masking jig of Reference Example 2. Compared to the sealing member (non-general purpose product), the procurement cost was about 1/4.

Further, regarding the coating quality and the life of the sealing member when electrodeposition coating is performed on the work using the masking jig for coating, the first, second and reference examples 1 are the same as those of the reference example 2. It was a level without problems. The reason is that since the seal member is a simple O-ring seal, the surface pressure applied to the seal member after being attached to the work is substantially uniform in the circumferential direction, and therefore the compression ratio of the O-ring seal is relatively high. Even if it is repeatedly used 50 times in a low setting (14% in the example), high sealing performance can be ensured and the compression rate is relatively low, so there is almost no risk that the O-ring seal will reach the end of its life at an early stage. It can be mentioned that.

Further, since the masking jigs for painting in Examples 1 and 2 using the removal jig can be removed immediately after being discharged from the firing furnace, the painting work efficiency is higher than that in the case where the removal jig is not used. It turned out that it can be enhanced. As a result, when the coating masking jigs of Examples 1 and 2 and the removing jigs thereof are used, they are consumed without sacrificing the coating quality and the life of the sealing member (O-ring seal). It was found that the procurement cost of parts (seal member: O-ring seal) can be remarkably suppressed, and the cost related to work coating at the time of mass production can be suppressed.

(3) Improvement of attachment / detachment workability and reduction of work load on the operator In addition, the removal jig used for the work of removing the painting masking jigs of Examples 1 and 2 from the work is described as "removal form". Both "(a)" and "removal form (b)" have a relatively simple structure, do not require power such as air or electricity, and can be held by an operator in the actual factory. The workability was good to the extent that it could be expected to be sufficiently usable in the case of manufacturing, and it could be handled with almost no work load. That is, the removal jig moves the cap outward in the central axis direction of the through hole by using the force applied by the operator in the normal direction of the central axis of the through hole as the action point on both opposite side portions of the second annular groove. It is configured so that it can be efficiently converted into a force to make it. As a result, when painting the work during mass production, the cap, which has a forcibly removed structure, is forcibly pulled out from the through hole of the work without using a removal jig, and the workability for attachment and detachment is improved as compared with the case of Reference Example 1. However, it was found that the work load of the worker can be reduced.

1, 1'Masking jig for painting 11 1st cap 111 1st annular groove 112 2nd annular groove 113 O-ring seal 114 Shaft hole 12 2nd cap 121 1st annular groove 122 2nd annular groove 123 O-ring seal 13 shaft Member 14 Nut 14'Bag nut 15 Spacer 2 Removal jig 21 Work holder 211 U-shaped groove 212/213 Flange 214/215 Tapered inclined surface 22 First slide tool 221.222 Protrusion part 223 Inclined surface 23 Second slide Jig 231 ・ 232 Protrusion part 233 Inclined surface 50 Work 51 Through hole 52 Central axis 53 Unpainted area 54 Convex part

Claims (9)

The through hole is intended for a work having a through hole having a convex portion protruding inward in the radial direction on the cylindrical inner peripheral surface, in order to prevent paint from adhering to the inner peripheral surface of the through hole. A set of masking jigs for painting and their removal jigs that seal both ends of the
The masking jig for painting is
The first annular groove formed on the outer peripheral surface and
The first annular groove is formed on the outer side of the through hole in the central axial direction, and is arranged on the outer side of the through hole in the central axial direction from both end faces of the through hole when both ends of the through hole are sealed. 2 annular grooves and
An O-ring seal fitted in the first annular groove and
With two caps, and
A force is applied to the two caps in a direction approaching each other so that the two caps both abut on the convex portion of the through hole, or at least one of the two caps is the cap and the convex portion. Each O-ring seal of the two caps is in contact with the convex portion via a spacer arranged between the portions, and is sealed between the first annular groove and the inner peripheral surface of the through hole. Fixing means for fixing the relative positions of the two caps in the closed state,
Is equipped with
The removal jig
A work holder and a slide tool for holding the work so that the central axis direction of the through hole is horizontal are provided.
The work holder is
Both end faces of the held work located in the central axis direction of the through hole are formed in a shape in which the taper angle formed by the normal direction of the central axis is in the range of 1 ° or more and less than 45 °. Includes a tapered slope,
The slide tool
A pair extending in a direction parallel to the normal direction of the central axis of the through hole and facing each other so that the opposite side portions of the second annular groove formed on the outer peripheral surface of the cap can be slidable. The ridges and
It has an inclined surface having a shape inclined with respect to the normal direction of the central axis at an angle substantially equal to the taper angle of the tapered inclined surface of the work holder.
The pair of ridges of the slide jig are slidably engaged with the opposite side portions of the second annular groove of the cap, and the inclined surface of the slide jig and the tapered inclination of the work holder. A set of a masking jig for painting and a removal jig thereof, characterized in that the cap of the masking jig for painting is removed from the through hole by relatively moving each other in a state of being in contact with the surface. The masking jig for painting and the removing jig thereof according to claim 1, wherein the slide tool of the removing jig is provided with two slide tools corresponding to both end surfaces of the work holder. Set of. The fixing means extends in the central axis direction of the through hole, penetrates one of the two caps so as to be relatively movable in the central axis direction, and holds a shaft member fixed to the other of the two caps. The set of the masking jig for painting and the removing jig thereof according to claim 1 or 2, wherein the masking jig is provided. The first or second aspect of the present invention, wherein the fixing means extends in the central axis direction of the through hole and has a shaft member that penetrates the two caps so as to be relatively movable in the central axis direction. A set of masking jigs for painting and their removal jigs. The fixing means
With the shaft member
The claim comprises a fixing member that is detachably fixed to a portion of the shaft member that protrudes through the cap and that can be restricted from moving in the direction in which the two caps are separated from each other. A set of a masking jig for painting and a jig for removing the masking jig according to 3 or 4. The shaft member has a thread groove formed at least in a part of the through hole in the central axial direction.
The set of a masking jig for painting and a jig for removing the masking jig according to claim 5, wherein the fixing member is a nut screwed into the screw groove of the shaft member. The two caps are made of metal
The O-ring seal is formed of a rubber composition containing any of silicone rubber, fluororubber, and nitrile rubber.
The fixing member is a bag nut,
The set of the masking jig for painting and the removing jig thereof according to claim 5 or 6, wherein an energizing path leading to the work is formed through one of the two caps. The through hole is intended for a workpiece having a through hole having a convex portion protruding inward in the radial direction on the cylindrical inner peripheral surface, in order to prevent paint from adhering to the inner peripheral surface of the through hole. It is a removal jig for the masking jig for painting that seals both ends of the
The masking jig for painting is
The first annular groove formed on the outer peripheral surface and
The first annular groove is formed on the outer side of the through hole in the central axial direction, and is arranged on the outer side of the through hole in the central axial direction from both end faces of the through hole when both ends of the through hole are sealed. 2 annular grooves and
An O-ring seal fitted in the first annular groove and
With two caps, and
A force is applied to the two caps in a direction approaching each other so that the two caps both abut on the convex portion of the through hole, or at least one of the two caps is the cap and the convex portion. Each O-ring seal of the two caps is in contact with the convex portion via a spacer arranged between the portions, and is sealed between the first annular groove and the inner peripheral surface of the through hole. Fixing means for fixing the relative positions of the two caps in the closed state,
Is equipped with
The removal jig
A work holder and a slide tool for holding the work so that the central axis direction of the through hole is horizontal are provided.
The work holder is
Both end faces of the held work located in the central axis direction of the through hole are formed in a shape in which the taper angle formed by the normal direction of the central axis is in the range of 1 ° or more and less than 45 °. Includes a tapered slope,
The slide tool
A pair extending in a direction parallel to the normal direction of the central axis of the through hole and facing each other so that the opposite side portions of the second annular groove formed on the outer peripheral surface of the cap can be slidable. The ridges and
It has an inclined surface having a shape inclined with respect to the normal direction of the central axis at an angle substantially equal to the taper angle of the tapered inclined surface of the work holder.
The pair of ridges of the slide jig are slidably engaged with the opposite side portions of the second annular groove of the cap, and the inclined surface of the slide jig and the tapered inclination of the work holder. A jig for removing a masking jig for painting, which comprises moving the cap of the masking jig for painting relative to each other in a state of being in contact with the surface, and removing the cap of the masking jig for painting from the through hole. The through hole is intended for a work having a through hole having a convex portion protruding inward in the radial direction on the cylindrical inner peripheral surface, in order to prevent paint from adhering to the inner peripheral surface of the through hole. A masking jig for painting that seals both ends of the coating and can be removed from the sealed through hole by a removal jig.
The masking jig for painting is
The first annular groove formed on the outer peripheral surface and
The first annular groove is formed on the outer side of the through hole in the central axial direction, and is arranged on the outer side of the through hole in the central axial direction from both end faces of the through hole when both ends of the through hole are sealed. 2 annular grooves and
An O-ring seal fitted in the first annular groove and
With two caps, and
A force is applied to the two caps in a direction approaching each other so that the two caps both abut on the convex portion of the through hole, or at least one of the two caps is the cap and the convex portion. Each O-ring seal of the two caps is in contact with the convex portion via a spacer arranged between the portions, and is sealed between the first annular groove and the inner peripheral surface of the through hole. Fixing means for fixing the relative positions of the two caps in the closed state,
Is equipped with
The removal jig
A work holder and a slide tool for holding the work so that the central axis direction of the through hole is horizontal are provided.
The work holder is
Both end faces of the held work located in the central axis direction of the through hole are formed in a shape in which the taper angle formed by the normal direction of the central axis is in the range of 1 ° or more and less than 45 °. Includes a tapered slope,
The slide tool
A pair extending in a direction parallel to the normal direction of the central axis of the through hole and facing each other so that the opposite side portions of the second annular groove formed on the outer peripheral surface of the cap can be slidable. The ridges and
It has an inclined surface having a shape inclined with respect to the normal direction of the central axis at an angle substantially equal to the taper angle of the tapered inclined surface of the work holder.
The pair of ridges of the slide jig are slidably engaged with the opposite side portions of the second annular groove of the cap, and the inclined surface of the slide jig and the tapered inclination of the work holder. A masking jig for painting, characterized in that the cap of the masking jig for painting is removed from the through hole by relatively moving each other in a state where the surfaces are in contact with each other.