JP3537593B2 - Hanging jig for electrodeposition coating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for suspending an object to be used for cationic electrodeposition coating for coating an object as a cathode and anion electrodeposition coating for coating an object as an anode.

[0002]

2. Description of the Related Art In electrodeposition coating, a conductive coating material is placed in a coating layer as a cathode or an anode, and a current is applied between the electrode and the other electrode to form a coating film on the coating material. A hanging jig for suspending a large number of objects to be coated is used for immersing the objects to be coated in the paint tank, and pulling and transferring the objects from the inside of the paint tank. The suspending jig has a large number of blades that protrude by suspending the object to be coated,
An object to be coated is hung on these blades through an electrodeposition coating process.

By the way, an electric current must be applied to an object to be coated and a suspending jig supporting the same during the electrodeposition coating process. However, the paint film adheres to the suspending jig due to the electrodeposition. And the electrical conductivity deteriorates. For this reason, when a new object is hung on the blade of the hanging jig, the object is rotated so as to pry the blade, the coating film on the blade surface is peeled off by the object, and the object and the blade surface are separated. You must make direct contact. However, when the blade surface is smooth, the coating film of the blade is not easily peeled off even if the blade is strongly squeezed with an object to be coated, resulting in poor current supply.

[0004] The solution to this problem is disclosed in Japanese Utility Model Application Laid-Open No. Hei 5-7726.
The problem is solved by the suspending jig described in Japanese Patent Publication No. 2 (Kokai) No. This suspension jig solves the problem by forming a small saw-toothed protrusion on the edge of the blade. In other words, the sharp ends of these projections penetrate the coating film and make point contact with the object to be coated, which helps to ensure electrical conductivity.

[0005] The suspension jig described in Japanese Utility Model Laid-Open No. 5-77262 will be briefly described.
Reference numeral 2 denotes an example of a hanging jig for electrodeposition coating.
Is a frame provided with a horizontal rail 2b on a rectangular outer frame 2a,
It comprises a number of suspension blades 3 fixed on the horizontal rail 2b and suspension hooks 4.

As shown in FIG. 18, the blade 3 is fixed by welding or the like to both ends of a support rod 4 fixed to the horizontal rail 2b by welding or the like, and protrudes obliquely upward on both sides. These blades 3 have, for example, a triangular shape, and are provided with ribs 5 having continuous chevron projections at edges forming both oblique sides. As shown in FIG.
Is hung on the blade 3 using the hole or the like.

As shown in FIG. 20, the rib 5 having a continuous chevron-shaped projection protrudes upward outside the range of the thickness t of the blade 3. Further, a rib 5 having a continuous chevron
Are formed with a large number of fine parallel ridges 5a. As shown in FIG. 21, the inner surface of the rib 5 having the continuous chevron is a slope 5b. Thereby, the rib 5 is strengthened.

[0008] FIG.
8, when it is hung as shown in FIG. 19, even if a coating film is present, it penetrates the coating film, and the upward pointed protrusion of the rib 5 bites into the hole of the object to be coated to secure conductivity. At this time, since the projection tips are upward and thin, the weight of the object to be coated directly acts on the upward tips, and digging is performed well. In addition, the upwardly-directed continuous chevron effectively prevents the object to be hung from falling.
Furthermore, the parallel ridges 5a on the outer surface of the rib 5 also serve to secure the electrical conductivity by penetrating into the inner wall of the hole of the object to be coated.

[0009]

In the known jig for electrodeposition coating described above, the weight of the object to be coated acts on the upward tip of the rib 5 having the continuous chevron-shaped projection, so that good penetration is achieved. . In addition, the upward continuous chevron projection prevents the hanging object from falling. However, when the object to be coated is small and extremely light (for example, about 2.2 grams),
Since the object to be coated hardly penetrates into the continuous chevron of the rib 5 due to its weight, it is often difficult to ensure sufficient conductivity. Further, since a light object is hard to bite into the continuous chevron of the rib 5, it is likely to be detached and fall. Conventionally, in such a case, there is a reality that about 50% of the electrodeposited product is defective, and in practice, electrodeposition coating was considered to be inappropriate.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to obtain a force for biting even when an object to be coated is light, and therefore, it is possible to secure good electric conductivity. Another object of the present invention is to provide a hanging jig for electrodeposition coating that can prevent the object to be coated from coming off.

[0011]

According to the present invention, there is provided a suspending jig for electrodeposition coating, comprising: a member to be coated which is formed of a conductive material; An elastic member protruding along the object-to-be-painted hanging member, the elastic member having a shape such that the elastic member gradually moves away from the object-to-be-painted-object suspending member toward the base end of the object-to-be-painted hanging member. The hole of the object to be coated is hung around the member to be coated and the elastic member, and the member to be coated is a blade having a thinned tip.
On the side edge of this blade, opposite to the elastic member.
To the side of the object,
Small projections are formed .

[0012]

Further, the elastic member may be constituted by a wire protruding from a distal end of the workpiece suspending member and bent toward a base end of the workpiece suspending member.

Furthermore, at the base of the member to be coated,
A displacement preventing portion for preventing the free end of the elastic member from being displaced toward the workpiece suspending member can be provided.

At the time of electrodeposition coating, a hole is formed in the object to surround both the elastic member and the object-hanging member and to bend the elastic member toward the object-hanging member. As a result, the elasticity of the elastic member acts to press the workpiece against the workpiece suspending member, and the holes of the workpiece and the workpiece suspending member are pressed against each other, so that the workpiece becomes lighter. Even if the gravitational force acting on it is small, the elasticity of the elastic member ensures that the workpiece suspension member bites into the hole of the workpiece, and that the workpiece suspension member and the surface of the workpiece Even if the coating film adheres to the surface, it is possible to secure the electricity supply.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

Also in the case of the present invention, the base end of the suspending blade 3 constituting the object-to-be-coated suspended member is formed on the rectangular outer frame 2a of the electrodeposition coating suspending jig 2 in the same manner as shown in FIG. Side beam 2b
It is fixed to the upper support rod 4 by welding or the like. In addition,
The manner of fixing the suspension blade 3 and the shape of the frame 2 are various and optional. The suspension blade 3 preferably projects obliquely upward from both sides of the support rod 4 as shown in FIGS. 1 and 2, but may also project substantially horizontally. These suspension blades 3 have, for example, a triangular shape, and a rib 5 having a continuous chevron projection is integrally provided on the edges forming both oblique sides. These ribs 5 protrude upward with respect to the surface of the blade 3 in the conventional example shown in FIGS. 18 to 21, but in the case of the present invention, the rib 5 having the continuous chevron is formed on the surface of the blade 3. On the other hand, it is different in that it protrudes downward.

As shown in an enlarged manner in FIG. 3, the rib 5 having the continuous chevron-shaped projection projects downward outside the range of the thickness t of the blade 3. Also, on the outer surface of these ribs 5,
As shown in FIG. 4 and FIG.
a is formed corresponding to each projection of the continuous chevron.
The inner surface of the rib 5 having the continuous chevron can be a slope 5b. Thereby, the rib 5 is reinforced.

One end of an elastic member 10 is fixed to the tip (the top of a triangular blade) of the suspending blade 3 constituting the workpiece suspending member by brazing or the like. The elastic member 10 is made of metal such as stainless steel (SU).
S440C) and is formed of a wire having a diameter of about 1 mm. In the illustrated embodiment, one end of the wire 10 is fixed to the lower surface of the distal end of the suspension blade 3 and is 1 mm from the end.
Oa extends a small distance forward, and is then bent back in the opposite direction, and extends linearly along the surface of the suspension blade 3 and near the base end, as indicated at 10b. I have. The straight portion 10b of the elastic member 10 is shaped so as to gradually move away from the surface of the suspension blade 3 toward the base end of the suspension blade 3, and has a free end 1b.
0c is slightly bent toward the suspension blade 3 as necessary. Note that the straight portion 10b does not necessarily need to be a straight line. As shown in FIGS. 4 and 5, the base end 10 d of the elastic member 10 may be bent and press-fit into the distal end of the suspension blade 3 from below. The elastic member 10 may be formed by a piano wire.

The substrate A has, for example, a form as shown in FIG. 6 and has a hanging hole 7 for hanging the suspension blade 3. The substrate A may have any shape, but only the hole 7 for hanging the suspension blade 3 is required.

In the present invention, the object to be coated A has holes 7
Inside, the suspension blade 3 of the suspension jig and the elastic member 10
Are applied as shown in FIG. 7 and 8 both show a state in which the objects to be coated A and A 'are applied. In the case of FIG. 7, the size of the object to be coated A (the size of the hole) is small, and in the case of FIG. The dimension (the dimension of the hole) of the object to be coated 'A is large. In any case, the article to be coated is inserted into the combination of the suspension blade 3 and the elastic member 10 from the distal end side thereof. As the object is inserted, the inner edge of the hole 7 of the object hits the inclined linear portion 10b of the elastic member 10. When the object is further inserted, the linear portion 10b is pushed down to the inner edge of the hole 7. Then, it is elastically deformed so as to approach the suspension blade 3 toward a position indicated by a virtual line in FIGS. 7 and 8. When the object advances to the limit position where the inner edge of the hole 7 of the object contacts the side edge of the triangular suspension blade 3 (the limit position is
As shown in FIG. 9, the diameter of the hole 7 is at a position equal to the width B and the width B ′ of the triangular suspension blade 3). Is obtained. In the case of FIG.
Is small, the object A reaches the limit position at a position relatively close to the tip (distance L from the tip), but in the case of FIG. 8, the size of the hole 7 of the object A 'is Because the object to be coated A ′ is relatively large (a distance L from the tip)
′) Is the limit position.

As described above, when the objects to be coated A and A 'reach the limit position, the elastic member 10 is elastically deformed so as to approach the suspension blade 3 as shown in FIG. The elasticity of the member 10 is shown in FIG.
And it presses upwards in FIG. This state is shown in FIG.
, And the acting force of the elastic member 10 is indicated by reference numeral F. Due to the pressing force F, the inner edges of the holes 7 of the substrates A and A ′ are pressed against the ribs 5 having continuous chevron projections on both side edges of the suspension blade 3 and bite into the ribs. In order to cause such biting, it is necessary that the ribs 5 face down as described above. In this case, the parallel protrusions 5a on the outer surface of the rib 5 also enter the inner wall of the hole of the workpiece A. Thus, the elastic member 1
Since the object to be coated is pressed against the ribs 5 or the like by the force of the elastic deformation of 0, even when the object to be coated is light and the necessary pressing force for the biting cannot be obtained only by gravity, it is possible to mount the object to be coated. As a result, a pressing force is automatically generated, and forced penetration of the coating film is caused, thereby ensuring electrical conductivity. The bite is made more effective by the rib 5 having a continuous chevron. In this embodiment, the form of the rib 5 having the continuous chevron projection is not necessarily the one shown in FIG. 3, and may be any downward-facing irregularity.

FIG. 11 shows another embodiment of the present invention. In this embodiment, an object-to-be-coated suspended member 3A having an angled cross section is used in place of the triangular plate-shaped suspension blade 3.
The object-to-be-coated suspended member 3A has a top edge 12 in the longitudinal direction, and a rib 5 having continuous chevron projections on both side edges as in the case of the above embodiment. It is apparent that the same operation and effect as in the above-described embodiment can be obtained in this embodiment. Note that, in this embodiment, the limit position to which the object to be moved can be determined not only by the width of the object-to-be-coated suspended member 3A but also by the cross-sectional area thereof. Also in this embodiment, the form of the ribs 5 having the continuous chevron projections is not necessarily the one shown in FIG.

FIG. 12 shows another embodiment of the present invention. In this embodiment, a simple round bar 3B is used in place of the triangular plate-shaped suspension blade 3. In this embodiment, a round bar is used as the member to be coated. However, if the surface of the bar, particularly the lower surface thereof, is provided with a sufficient friction surface or a rib 5 similar to that described above, the substrate can be suspended. The corner of the inner edge of the hole of the article pressed upward by the elastic member 10 against the member 3B can be cut into the surface of the article suspending member 3B.

FIGS. 13 and 14 show still another embodiment of the present invention. The same reference numerals are given to the same portions as those of the embodiment already described, and the description thereof will be omitted. Only the different portions will be described. In this embodiment, in the embodiment shown in FIGS. A displacement preventing portion 14 is integrally formed so as to rise from the base end of the blade 3 to the side where the elastic member 10 is located. Then, the displacement prevention unit 14
Is provided with a hole 15. On the other hand, the distal end of the linear portion 10 b of the elastic member 10, one end of which is fixed to the distal end of the workpiece suspending blade 3, is inserted into the hole 15. The elastic member 10 may be formed so as to be folded back from the distal end portion 10a as shown in FIGS. 3 and 4, but in this embodiment, the linear portion 10b of the elastic member 10 is directly fixed to the distal end portion of the suspension blade 3. Have been. The elastic member 10 can pass through the hole 15 in, for example, a natural state (a state where no external force is applied). However, it is also possible that the elastic member 10 has an elastic distortion in the state of FIG. .

The position of the hole 15 is determined as shown in FIG. An object A to be coated is fitted into the suspension blade 3 as shown by an arrow D, and the position where the inner edge of the hole 7 cannot be further pushed in due to the width or cross-sectional dimension of the blade 3 is shown in FIG. In the case of the position of the coating material A, the hole 7
Edge 7a farthest from blade 3 and blade tip 3
Suppose a straight line 18 connecting a. And this straight line 18
Is assumed to be at a point 17 intersecting with the displacement prevention part 14, the center of the hole 15 of the displacement prevention part 14 is shifted from the point 17 in the arrow H direction.

In this embodiment, since the elastic member 10 is inserted into the hole 15 of the displacement preventing portion 14, the hole of the workpiece A is inserted into the blade 3 and the elastic member 10 in FIG. When the elastic member 10 is pushed in the direction E, the elastic member 10 tends to elastically deform toward the blade 3 due to the inner edge of the hole of the object to be coated. However, since the free end side of the elastic member 10 is in the hole 15 of the displacement preventing portion 14 and is prevented from being displaced, the linear portion 10b of the elastic member 10 pushes the workpiece A in as shown in FIG. As it goes, it curves so as to approach the blade 3 at an intermediate portion. The elastic member 10 that bends and deforms in this manner is compared with the case where the displacement preventing portion 14 is not provided.
A larger pressing force F is applied to the workpiece A. That is, due to the return of the elastic member 10 that has been bent and deformed, the edge of the hole of the work A is pressed more strongly against the rib 5 and bites into it, thereby improving the electrical conductivity. In addition, the linear portion 10b of the elastic member also exerts a large pressing force F on the workpiece A,
It acts strongly on the inner edge of the hole of the article to be coated to drop the paint, thereby improving the current flow. The increase in the pressing force F is as follows.
This means that the object to be coated is more reliably held on the hanging jig. Usually, the object to be coated A is held by a hanging jig and immersed in the paint being stirred to prevent precipitation of the pigment. Is held securely, does not fall off, and the conductivity is ensured.

In this embodiment, in addition to the increase in the pressing force by the elastic member 10 as described above, the following effects can be obtained. That is, since the displacement of the free end of the elastic member 10 is limited, the elastic member 10 is largely deformed as a whole by the external force with respect to the suspension blade 3, and a root portion of the elastic member 10 with respect to the blade 3 is formed. Is not greatly deformed and damaged.
Further, in order to increase the pressing force F, it is not necessary to use a wire material having a strong elasticity (thick), and for example, a wire diameter of 0.6 to 0.1 mm is used.
8mm wire (stainless steel spring wire or piano wire)
Can be used.

Incidentally, as shown in FIG.
By determining the position of the hole 15, it is possible to obtain a hanging jig that can easily insert the article A to be coated and can secure a necessary pressing force F.

[0030]

As described above, according to the present invention, the elastic member protrudes from the tip of the suspension member of the object to be suspended of the suspension jig for electrodeposition coating along the suspension member. Has a shape that is gradually separated from the workpiece suspension member toward the base end of the workpiece suspension member, so that the hanging hole of the workpiece is formed by the workpiece suspension member and the elastic member. After hanging on both sides of the member, the object to be suspended is pushed forward, so that the elastic member is elastically deformed at the inner edge of the hanging hole of the object so as to approach the object to be suspended. Since the inner edge of the hanging hole of the workpiece is pressed against the workpiece suspending member by the repulsive force, the workpiece is too light and only the gravity causes the hanging hole to the coating film on the surface of the workpiece hanging member. Even if it is not possible to cut into the inner edge of the The Power narrowing There can be generated,
In this way, it is possible to break down the coating film on the surface of the object to be coated or the member to be coated and suspend electricity.

In the present invention, the elastic member for generating a biting force acts to press the object to be coated against the object to be suspended, so that the object to be coated comes off the object to be suspended and falls. Is prevented. Furthermore, in the conventional case, when hanging the workpiece on the workpiece suspending member, the workpiece is twisted with respect to the workpiece suspending member in order to break the coating film and secure the current supply. Although hanging is performed while rubbing, in the case of the present invention, the object to be coated is simply inserted without twisting the object to be twisted, and the object-to-be-suspended member and the object to be coated mutually automatically. The problem of deformation of the object to be coated and the like is eliminated by the operation of inserting the object to be coated while rubbing the object to be twisted.

The object-to-be-suspended member is constituted by a blade having a thinned tip, and a number of small projections which can bite into the object to be coated are formed on the side of the blade opposite to the elastic member. In addition, mutual engagement between the object to be coated and the object-to-be-coated suspension member based on the biting force by the elastic member is more reliably achieved.

Further, by forming the elastic member from a wire protruding from the distal end of the workpiece suspension member and bent toward the base end of the workpiece suspension member, the elastic member is inexpensive and surely elastic. A force can be applied to the object to be coated.

Further, by restricting the free end of the elastic member by the displacement preventing portion, the pressing force of the object to be coated obtained by the deformation of the elastic member is increased, and the coating film is more reliably destroyed and the electric current is secured. In addition, the elastic member itself can be protected from breakage.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a hanging jig for electrodeposition coating of the present invention.

FIG. 2 is a side view of a part of FIG. 1;

FIG. 3 is an enlarged perspective view of a workpiece suspending member and an elastic member of the electrodeposition coating suspending jig shown in FIG. 1;

FIG. 4 is a side view of the workpiece suspending member and the elastic member of FIG. 3;

FIG. 5 is a plan view of a workpiece suspending member and an elastic member of FIG. 3;

FIG. 6 is a perspective view showing an example of an object to be coated.

FIG. 7 is an explanatory view showing a state in which an object to be coated is mounted on a member to be coated suspended and an elastic member in FIG. 3;

FIG. 8 is an explanatory view showing a state in which another object to be coated is mounted on the object to be suspended and the elastic member of FIG. 3;

FIG. 9 is a common plan view of FIG. 7 or FIG.

FIG. 10 is an explanatory view showing a relationship between the object to be coated suspended member and the elastic member and the suspended coated object.

FIG. 11 is a perspective view showing another embodiment of the hanging jig for electrodeposition coating of the present invention.

FIG. 12 is a perspective view showing still another embodiment of the hanging jig for electrodeposition coating of the present invention.

FIG. 13 is a perspective view showing another embodiment of the hanging jig for electrodeposition coating of the present invention.

FIG. 14 is a partial cross-sectional side view of FIG.

FIG. 15 is a diagram showing a state in which an object to be coated is hung on the hanging jig for electrodeposition coating of FIG. 13;

FIG. 16 is a view for explaining positions of holes of a displacement preventing portion of the hanging jig for electrodeposition coating of FIG. 13;

FIG. 17 is a perspective view showing an example of a frame of a known suspending jig for electrodeposition coating.

FIG. 18 is a perspective view showing an object-to-be-coated suspended member in a known electrodeposition coating suspending jig.

FIG. 19 is a side sectional view of a part of FIG. 14;

20 is an enlarged perspective view of the object-to-be-coated suspended member shown in FIG. 14;

FIG. 21 is a cross-sectional view of the workpiece suspending member of FIG.

[Explanation of symbols]

2 Hanging jig 3 Coating object hanging member (blade) 5 Rib 5a having continuous chevron projection 5a Parallel ridge 5b Slope 7 Hanging hole 10 Elastic member (wire) 10b Diagonal of an elastic member gradually moving away from the object hanging member Straight part A Workpiece A 'Workpiece F Elastic force t Workpiece suspension member thickness 14 Displacement prevention part 15 Hole

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-8-20896 (JP, A) JP-A 5-77262 (JP, U) JP-A 1-106571 (JP, U) JP-A 59- 141575 (JP, U) “Plating Technology Handbook” (July 20, 1983), published by Nikkan Kogyo Shimbun, pp. 632-640 (58) Fields investigated (Int. Cl. ⁷ , DB name) C25D 13 / 00 C25D 17/08

Claims (3)

(57) [Claims] 1. An object suspension member formed of a conductive material, and an elastic member protruding from a tip of the object suspension member along the object suspension member. The elastic member has a shape such that the elastic member gradually moves away from the workpiece suspension member toward the base end of the workpiece suspension member. The object to be coated is suspended by a blade having a thin tip.
On the side edge of this blade, opposite to the elastic member.
To the side of the object,
A hanging jig for electrodeposition coating, wherein a small projection is formed . 2. The apparatus according to claim 1, wherein the elastic member is formed of a wire protruding from a tip end of the workpiece suspending member and bent toward a base end of the workpiece suspending member. Item 4. The hanging jig for electrodeposition coating according to item 1. 3. The apparatus according to claim 3, wherein a displacement preventing portion for preventing a free end of the elastic member from being displaced toward the workpiece suspending member is protruded from a base of the workpiece suspending member. Feature
The hanging jig for electrodeposition coating according to claim 1 .