JP2012167311A - Electrodeposition coating bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrodeposition coating bath capable of surely controlling film thickness regardless of change in size or shape of a coating object workpiece.SOLUTION: The electrodeposition coating bath 10 includes a groove-shaped current-carrying regulation cover 20 provided inside a tub body 11. The cover 20 is composed of an electric insulating material, and regulates the current-carrying between the coating object workpiece W and an electrode 12. A thick film portion is formed on the upper end side of the workpiece W which is not housed in the cover 20, and a thin film portion limited in film thickness is formed on the lower end side of the workpiece W which is housed in the cover 20. Since the opening width of the cover 20 is changeable, the workpiece W can be arranged adjacently to the opening edge in the opening width direction (tips of collar walls 25, 25) of the cover 20 regardless of the size of the workpiece W.

Description

  The present invention is an electrodeposition coating for storing an electrodeposition coating liquid and performing an electrodeposition coating on the surface of the object to be coated by energizing between the electrode in the electrodeposition coating liquid and the object to be coated. It relates to a bathtub.

  As this type of conventional electrodeposition coating bathtub, an energization restriction cover is arranged between a predetermined part of the workpiece to be painted and the electrode to regulate energization between them, and the coating film is applied according to the part of the workpiece to be painted. There is known one in which the thickness is controlled (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-152599 (paragraph [0037], FIG. 2)

  However, in the conventional electrodeposition coating bathtub described above, the energization restriction cover cannot cope with the change in the size and shape of the work to be painted when the type of the work to be painted is switched. There was a problem that the coating became thicker or thinner than necessary.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrodeposition coating bathtub capable of reliably controlling the film thickness regardless of changes in the size and shape of a workpiece to be painted. To do.

  An electrodeposition coating bathtub according to the invention of claim 1 made to achieve the above object has an electrode disposed in the electrodeposition coating liquid while storing the electrodeposition coating liquid, Grooves that extend in the direction of movement of the workpiece to be coated in an electrodeposition coating bath for performing electrodeposition coating on the surface of the workpiece to be painted by energizing between the workpiece to be painted and the electrode moving in the liquid A groove-shaped energization restriction cover that is shaped and is submerged in the electrodeposition paint liquid, accepts a part of the workpiece to be painted and regulates the current between the electrode and the groove shape according to the workpiece to be painted It has a feature in that it includes an opening width variable mechanism that can change the opening width of the energization regulating cover.

  According to a second aspect of the present invention, in the electrodeposition coating bathtub according to the first aspect, at least one of the pair of cover side walls facing each other in the groove width direction is separated from the cover bottom wall in the groove-shaped energization regulating cover. It is characterized in that a mechanism for supporting one of the side walls of the cover so as to be movable in the groove width direction with respect to the cover bottom wall is provided as a variable opening width mechanism.

  According to a third aspect of the present invention, in the electrodeposition coating bathtub according to the first or second aspect, the entire groove-shaped energizing restriction cover can be moved in the depth direction of the groove, or the groove-shaped energizing restriction cover The present invention is characterized in that a cover moving mechanism is provided that allows the pair of cover side walls opposed in the groove width direction to be expanded and contracted in the groove depth direction.

  A bath for electrodeposition coating according to the invention of claim 4 stores an electrodeposition paint liquid, has an electrode disposed in the electrodeposition paint liquid, and moves in the electrodeposition paint liquid. In the electrodeposition coating bath for electrodeposition coating on the surface of the object to be coated by energizing with the electrode, it has a grooved structure extending in the moving direction of the object to be painted and the electrodeposition paint liquid A groove-shaped energization restriction cover that is submerged inside and receives a part of the workpiece to be painted and restricts the energization between the electrodes and the entire groove-shaped energization restriction cover can be moved in the depth direction of the groove Alternatively, the present invention is characterized in that a cover moving mechanism is provided in which a pair of cover side walls opposed in the groove width direction of the groove-shaped energization regulating cover can be expanded and contracted in the depth direction of the groove.

  According to a fifth aspect of the present invention, in the electrodeposition coating bathtub according to any one of the second to fourth aspects, at least one of the pair of cover side walls communicates with the inside and outside of the groove-shaped energization regulating cover. In addition, the present invention is characterized in that a through hole for film thickness adjustment capable of changing the opening area is formed.

  According to a sixth aspect of the present invention, in the electrodeposition coating bathtub according to the fifth aspect, the cover side wall includes a base plate and a slide plate that is slidably held with respect to the base plate. A plurality of first through holes configured and formed through the base plate, and a plurality of second through holes formed through the slide plate at positions corresponding to the plurality of first through holes. Characterized by where the mouth is constructed.

  According to a seventh aspect of the present invention, in the electrodeposition coating bathtub according to the fifth or sixth aspect, the eaves wall projecting inward in the opening width direction from the tip of the cover side wall provided with the through hole for adjusting the film thickness. It is characterized by the provision.

  The invention of claim 8 is the electrodeposition coating bathtub according to any one of claims 1 to 7, wherein the electrodeposition coating bathtub extends in the horizontal direction, and the object to be coated is the electrodeposition coating bathtub. The electrodeposition coating bathtub can be linearly transported from one end position to the other end position in the longitudinal direction while suspended from above, and the groove-shaped energization restriction cover extends in parallel with the electrodeposition coating bathtub and is the object to be coated. It is characterized by being configured to receive the lower end of the workpiece.

[Inventions of Claims 1 and 2]
According to the invention of claim 1, when energization is performed between the electrode and the coating target workpiece in a state where a part of the coating target workpiece is received inside the groove-shaped energization regulation cover having a groove-shaped structure. A relatively thick coating film is formed on the portion of the groove-shaped energization regulating cover that protrudes outside, and a relatively thin coating film is formed on the portion received by the groove-shaped energization regulating cover. According to the present invention, since the opening width of the groove-shaped energization restriction cover can be changed according to the size and shape of the workpiece to be painted, the object to be painted is irrespective of the change in the size and shape of the workpiece to be painted. The film thickness can be reliably controlled according to the part of the workpiece. Here, as an opening width variable mechanism for changing the opening width of the groove-shaped energization restriction cover, for example, at least one cover side wall of a pair of cover side walls opposed in the groove width direction of the groove-shaped energization restriction cover is covered. A mechanism (invention of claim 2) that supports the bottom wall so as to be movable in the groove width direction may be employed. For example, the opening width direction of the groove-type energization regulating cover may be provided at the tip of at least one of the cover side walls. You may employ | adopt the mechanism provided with the eaves wall supported so that movement was possible.

[Invention of claim 3]
According to the invention of claim 3, the acceptance range of the workpiece to be painted can be changed in the depth direction of the groove of the groove-shaped energization restriction cover. And the boundary position of the comparatively thickly painted part and the comparatively thinly coated part of the workpiece to be painted can be adjusted.

[Invention of claim 4]
According to the invention of claim 4, when energization is performed between the electrode and the coating target workpiece in a state where a part of the coating target workpiece is received inside the groove-shaped energization regulating cover having a groove-shaped structure. A relatively thick coating film is formed on the portion of the groove-shaped energization regulating cover that protrudes outside, and a relatively thin coating film is formed on the portion received by the groove-shaped energization regulating cover. And according to this invention, according to the size and shape of a workpiece to be coated, the entire groove-shaped energization restriction cover is moved in the depth direction of the groove, or a pair of cover side walls in the groove-shaped energization restriction cover is provided. Since it can be expanded and contracted in the depth direction of the groove, the film thickness can be reliably controlled according to the site of the workpiece to be painted, regardless of changes in the size or shape of the workpiece to be painted.

[Invention of claim 5]
According to the invention of claim 5, by adjusting the opening area of the through hole for adjusting the film thickness, the film thickness of the portion received by the groove-shaped energization regulating cover can be adjusted. That is, the coating film can be thickened by increasing the opening area, and the coating film can be thinned by reducing the opening area.

[Inventions of Claims 6 and 7]
According to the invention of claim 6, by sliding the slide plate with respect to the base plate, the area of the overlapping portion of the first through hole and the second through hole, that is, the opening area of the film thickness adjusting through hole is obtained. Can be adjusted. Here, the arrangement of the plurality of first through holes in the base plate and the arrangement of the plurality of second through holes in the slide plate are not particularly limited and may be arranged side by side on the same straight line. You may arrange in a staggered pattern.

  By the way, if the through hole for adjusting the film thickness is too close to the workpiece to be coated, the coating film at the portion facing the through hole for adjusting the film thickness may be locally thickened. On the other hand, according to the invention of claim 7, the coating object workpiece and the coating object workpiece can be obtained by including the eaves wall projecting inward in the opening width direction from the front end portion of the cover side wall provided with the through hole for film thickness adjustment. Even when the opening edge of the groove-shaped energization regulating cover is arranged close to the film-thickness energizing restriction cover, the film thickness adjusting through-hole and the object to be coated can be arranged separately. Thereby, the film thickness abnormality that the coating film of the part facing the through-hole for film thickness adjustment among the workpieces to be coated becomes thick locally can be prevented.

[Invention of Claim 8]
According to invention of Claim 8, it immerses in the electrodeposition coating liquid in the state which suspended the object to be coated from the upper part of the electrodeposition coating bathtub extended in the horizontal direction, and from one end of the longitudinal direction of the electrodeposition coating bathtub. A coating film is formed on the object to be coated by energizing between the object to be coated and the electrode while linearly transporting to the other end. At this time, since the lower end portion of the workpiece to be coated is received by the groove-shaped energization restriction cover, a relatively thin coating film is formed on the lower end portion, and a relatively thick coating film is formed on the upper end side that protrudes from the groove-shaped energization restriction cover. Is formed.

The perspective sectional view of the bathtub for electrodeposition painting concerning a 1st embodiment of the present invention. Front sectional view of electrodeposition painting bathtub (A) Conceptual diagram showing the movement trajectory in the depth direction of the groove-shaped energization restriction cover, (B) Conceptual diagram showing the movement trajectory in the groove width direction Partial enlarged cross-sectional view of the groove-shaped energization restriction cover Perspective view of cover side wall Front cross-sectional view of channel-type energizing restriction cover with through hole for film thickness adjustment closed Front sectional view of the groove-shaped energizing restriction cover with the through hole for film thickness adjustment opened Front sectional view of electrodeposition painting bathtub according to the second embodiment The perspective view of the cover side wall which concerns on a modification Front sectional view of a bath for electrodeposition painting according to a modification The perspective view of the groove-shaped electricity supply regulation cover which concerns on a modification Front sectional view of a bath for electrodeposition painting according to a modification

[First Embodiment]
Hereinafter, the bathtub 10 for electrodeposition coating which concerns on 1st Embodiment of this invention is demonstrated, referring FIGS. 1-7. The electrodeposition coating bathtub 10 includes a bathtub body 11 extending in the horizontal direction, and an electrodeposition coating liquid is stored in the bathtub body 11. As shown in FIG. 2, the painting target work W is suspended from above the bathtub body 11 by a conveying device (not shown). For example, the entire coating target workpiece W excluding the upper end held by the conveying device. In a state where it is submerged below the surface of the electrodeposition coating liquid, the bathtub body 11 is conveyed linearly from one end to the other end in the longitudinal direction. In the meantime, energization is performed between the electrode 12 disposed in the electrodeposition coating liquid and the workpiece W to be coated, and a coating film of the electrodeposition coating is formed on the surface of the workpiece W to be coated.

  As shown in FIG. 1, a groove-type energization restriction cover 20 made of an electrically insulating material is accommodated inside the bathtub body 11. The groove-shaped energization restriction cover 20 has a rectangular groove-shaped structure extending along the longitudinal direction of the bathtub body 11 and having both ends in the longitudinal direction and the upper surface opened. The groove-shaped energizing restriction cover 20 is provided so as to be completely immersed in the electrodeposition treatment liquid in a state separated from the bathtub main body 11, and the electrode 12 is disposed outside the groove-shaped energizing restriction cover 20 in the bathtub main body 11. ing. In this embodiment, although the electrodes 12 and 12 are arrange | positioned between the bottom wall 11B of the bathtub main body 11, and the groove-shaped electricity supply control cover 20, both side wall 11A, 11A of the bathtub main body 11 and the groove-type electricity supply control cover 20 are provided. An electrode may be disposed between the two. Moreover, although the electrode 12 of this embodiment has comprised the rod shape extended along the longitudinal direction of the bathtub main body 11 (groove-shaped electricity supply control cover 20), the shape of the electrode 12 is not specifically limited, For example, It may be plate-shaped.

  The workpiece W to be painted is linearly conveyed from one end of the groove-shaped energization restriction cover 20 to the other end with the lower end thereof being received inside the groove-shaped energization restriction cover 20, and during that time, the groove-shaped energization restriction cover 20 regulates energization between the lower end of the workpiece W to be coated and the electrode 12.

  A plurality of stands 50 and 50 for suspending and holding the groove-shaped energization restriction cover 20 in the bathtub body 11 are provided on the outside of the bathtub body 11. A plurality of stands 50, 50 are arranged in the longitudinal direction of the bathtub main body 11 and are opposed to each other in the width direction of the bathtub main body 11. Each stand 50 includes a vertical post 51 standing vertically and a movable bar 52 attached to the vertical post 51 so as to be movable up and down. The movable bar 52 extends in the horizontal direction and is integrally provided with a post fitting cylinder 53 at the base end, and the post fitting cylinder 53 is slidably fitted to the vertical post 51. Further, the post fitting cylinder 53 can be fixed by a set screw 53A at an arbitrary position of the vertical post 51 (see FIG. 2).

  The groove-shaped energization restriction cover 20 and the movable bars 52, 52 are connected by connecting members 26, 26, respectively. A bar fitting cylinder 27 is integrally provided at the upper end of each connecting member 26, and the bar fitting cylinder 27 is slidably fitted to the movable bar 52. Further, the bar fitting cylinder 27 can be fixed by a set screw 27A at an arbitrary position of the movable bar 52.

  The groove-shaped energization restriction cover 20 connects the pair of side cover members 22 and 22 opposed in the groove width direction, and the pair of side cover members 22 and 22 and constitutes the bottom wall of the groove-shaped energization restriction cover 20. The under cover member 21 (corresponding to the “cover bottom wall” of the present invention) is configured (see FIG. 2).

  The under cover member 21 has a strip shape extending along the longitudinal direction of the bathtub body 11 and parallel to the bottom surface of the bathtub body 11. On the other hand, the pair of side cover members 22, 22 has a bracket shape in cross section, extends in the longitudinal direction of the bathtub body 11, and is connected to the under cover member 21.

  Of the side cover members 22, 22, the cover side walls 23, 23 facing each other in the groove width direction of the groove-shaped energization regulating cover 20 extend in parallel with the both side walls 11 </ b> A, 11 </ b> A of the bathtub body 11. Further, cover member connecting walls 24, 24 project from the lower end portions of the cover side walls 23, 23 toward the inside in the groove width direction of the groove-shaped energization restriction cover 20.

  The cover member connecting wall 24 has a strip shape that intersects the cover side wall 23 at a right angle and extends in parallel with the under cover member 21. Of the cover member connecting wall 24, a portion closer to the tip away from the cover side wall 23 is overlaid on the upper surface of the under cover member 21. In addition, the under cover member 21 and the side cover member 22 are connected by a plurality of bolts 28 </ b> B and 28 </ b> B penetrating the under cover member 21 and the cover member connecting wall 24. More specifically, the under cover member 21 is formed with a plurality of bolt free insertion holes 21A, 21A. As shown in FIG. 4, the bolt loosely fitting holes 21 </ b> A have a long hole shape extending in the width direction of the groove-shaped energization regulating cover 20, and a plurality of bolts are provided in the longitudinal direction of the undercover member 21. Bolts 28B penetrating the cover member connecting wall 24 are inserted into the bolt loose fitting holes 21A, and are usually fastened with nuts 25N from the lower surface side of the undercover member 21. Further, in a state where the nut 28N and the set screw 27A of the bar fitting cylinder 27 described above are loosened, the bolt 28B can move within the bolt loose fitting hole 21A, and the bar fitting cylinder 27 can move with respect to the movable bar 52. Thus, the side cover member 22 can be moved in the groove width direction of the groove-shaped energization regulating cover 20 with respect to the under cover member 21 (see FIG. 3B). Thus, the mechanism that supports the side cover member 22 so as to be movable in the groove width direction with respect to the under cover member 21 corresponds to the “opening width variable mechanism” of the present invention.

  As shown in FIG. 2, a flange wall 25 projects from the upper end portion of the cover side wall 23 of the side cover members 22, 22 toward the inside in the opening width direction of the groove-shaped energization restriction cover 20. The eaves wall 25 has a strip shape that intersects the cover side wall 23 at a right angle and is narrower than the cover member connecting wall 24. Further, the plurality of connecting members 26, 26 are raised from the upper surface of the wall 25.

  The cover side wall 23 in the side cover member 22 is composed of a base plate 30 and a slide plate 32 attached to be overlapped on the outer surface of the base plate 30, and the aforementioned collar wall 25 and the cover member connecting wall 24 are composed of the base plate. 30 is integrally provided. A pair of guide rails 31, 31 are provided on the upper side and the lower side of the outer surface of the base plate 30, and the upper side and the lower side of the slide plate 32, which has a strip plate shape, can slide on the guide rails 31, 31. It is locked to. That is, the slide plate 32 is slidable in the longitudinal direction of the groove-type energization restriction cover 20 with respect to the base plate 30.

  A plurality of first through holes 30 </ b> A and 30 </ b> A are formed through the base plate 30. The plurality of first through holes 30A, 30A are provided, for example, in the longitudinal direction of the groove-shaped energization restriction cover 20, and have, for example, a rectangular shape (see FIG. 1).

  A plurality of second through holes 32A and 32A are formed through the slide plate 32 at positions corresponding to the first through holes 30A and 30A. That is, the second through holes 32A and 32A are also provided side by side in the longitudinal direction of the groove-shaped energization restriction cover 20, and have the same shape (for example, a rectangular shape) as the first through holes 30A and 30A, respectively. Note that the sizes of the first through hole 30A and the second through hole 32A are substantially the same.

  The first through holes 30A and 30A and the second through holes 32A and 32A constitute a film thickness adjusting through hole 23A according to the present invention (see FIG. 5), and the slide plate 32 is slid with respect to the base plate 30. Thus, the opening area of the film thickness adjusting through hole 23A (that is, the area of the overlapping portion between the first through holes 30A and 30A and the second through holes 32A and 32A) can be adjusted. Specifically, from the fully closed state (see FIG. 6) in which the first through holes 30A, 30A are completely closed by the wall portion of the slide plate 32, the first through holes 30A, 30A coated second through holes 32A, 32A and Can be adjusted to a fully opened state (see FIG. 7).

  The configuration of the present embodiment is as described above, and the operation will be described next. When performing electrodeposition coating on the workpiece W to be coated, the workpiece W suspended from a transfer device (not shown) is submerged in the electrodeposition coating liquid at one end position in the longitudinal direction of the bathtub body 11, and the state is maintained. As it is, while moving linearly toward the other end position of the bathtub body 11 in the longitudinal direction, energization is performed between the electrode 12 and the workpiece W to be coated. Then, the paint particles in the electrodeposition paint liquid adhere to the surface of the workpiece W to be coated to form a coating film. And the coating object workpiece | work W moved linearly from the one end position of the bathtub main body 11 over the predetermined time to the other end position is pulled up from the electrodeposition coating liquid at the other end position of the bathtub main body 11.

  By the way, when the inside of the bathtub main body 11 is linearly moved, the lower end side of the coating target workpiece W is received inside the groove-shaped energization restriction cover 20. Since the groove-shaped energization restriction cover 20 is made of an electrically insulating material, the portion of the groove-type energization restriction cover 20 that is received inside has a coating particle that is larger than the portion that protrudes from the groove-shaped energization restriction cover 20. As a result, a relatively thick coating film (hereinafter referred to as “thick film portion”) is formed on the upper end side of the coating target workpiece W, and the film thickness is reduced on the lower end side of the coating target workpiece W. A limited relatively thin coating film (hereinafter referred to as “thin film portion”) is formed.

  When the size of the workpiece to be coated W becomes smaller than before due to the change of the type of the workpiece to be painted W or the like, the opening edge in the groove width direction of the groove-shaped energization restriction cover 20 (in this embodiment, the wall 25, 25) and the portion to be painted W are widened to facilitate energization of the portion received by the groove-shaped energization regulating cover 20, and the thin film portion may become thicker than necessary. In order to prevent this, the side cover members 22 and 22 may be moved in the groove width direction in accordance with the reduction in the work size to narrow the opening width (the distance between the tips of the flange walls 25 and 25).

  Specifically, a plurality of bolts 28B and nuts 28N connecting the under cover member 21 and the side cover members 22 and 22 are loosened, and a set screw 27A of the bar fitting cylinder 27 is loosened, and both side cover members 22 and 22 are loosened. Are moved closer to each other in the groove width direction of the groove-shaped energization restriction cover 20 (see FIG. 3B). When the opening width is narrowed according to the size of the workpiece W to be painted, the bolt 28B and the nut 28N are tightened to fix the under cover member 21 and the side cover members 22 and 22, and the set screw 27A is tightened to form the groove-shaped energization regulation. The cover 20 is fixed.

  Thereby, the space | interval between the opening edge (in this embodiment, the front-end | tip of the eaves walls 25 and 25) and the coating object workpiece | work W can be narrowed, and it was received by the groove-shaped electricity supply control cover 20 by this. Energization to the part can be regulated with certainty. That is, regardless of the size reduction of the workpiece W to be coated, the thickness of the coating film (thin film portion) received by the groove-type energization restriction cover 20 can be surely limited so as not to be more than necessary.

  Here, when it corresponds to the change of the size and shape in the vertical direction of the workpiece W to be coated, or when the boundary position (parting-off) between the thin film portion and the thick film portion in the workpiece W to be coated is changed, post-fitting The position of the movable bar 52 may be adjusted by loosening the set screw 53A of the cylinder 53 (see FIG. 3A). Thereby, the position of the groove-shaped energization restriction cover 20 can be adjusted in the depth direction of the groove (in this embodiment, the vertical direction). Here, the vertical post 51 and the post fitting cylinder 53 correspond to the “cover moving mechanism” of the present invention.

  Thus, according to this embodiment, since the opening width of the groove-shaped energization restriction cover 20 can be changed according to the size and shape of the painting target workpiece W, the size and shape of the painting target workpiece W are changed. Regardless of this, it is possible to reliably control the film thickness in accordance with the portion of the workpiece W to be coated.

  In addition, according to the present embodiment, the opening area of the film thickness adjusting through hole 23 </ b> A is adjusted by sliding the slide plate 32 relative to the base plate 30 on the cover side walls 23, 23 of the groove-shaped energization restriction cover 20. It is possible to adjust the thickness of the coating film (thin film portion) received by the groove-shaped energization restriction cover 20 in the workpiece W to be coated (see FIGS. 6 and 7). Specifically, the thin film portion can be made thicker by increasing the opening area of the film thickness adjusting through hole 23A. Further, the thin film portion can be made thinner by reducing the opening area of the film thickness adjusting through hole 23A.

  Furthermore, according to the present embodiment, when the opening width of the groove-shaped energization restriction cover 20 is narrowed by providing the flange walls 25, 25 projecting inward in the opening width direction from the upper end edges of the cover side walls 23, 23. In addition, the film thickness adjusting through holes 23A and 23A and the coating object workpiece W can be arranged relatively apart from each other. Thereby, the film thickness adjusting through-holes 23A, 23A are too close to the coating target workpiece W, and the film thickness abnormality in which the coating film in the portion facing the film thickness adjusting through-hole 23A is locally thickened is prevented. be able to.

[Second Embodiment]
A second embodiment is shown in FIG. As shown in the figure, a bottom slide plate 41 is assigned to the lower surface of the under cover member 21. The bottom slide plate 41 is slidable in the longitudinal direction of the groove-shaped energization regulating cover 20 (direction perpendicular to the paper surface in FIG. 8) by a pair of guide rails 42, 42 provided on both sides of the lower surface of the under cover member 21. Is retained.

  A plurality of fixed through holes 21 </ b> B and 21 </ b> B are formed through the under cover member 21. The plurality of fixed through holes 21 </ b> B and 21 </ b> B are provided side by side in the longitudinal direction of the groove-shaped energization restriction cover 20, for example.

  A plurality of moving through holes 41A and 41A are formed through the bottom slide plate 41 at positions corresponding to the fixed through holes 21B and 21B of the under cover member 21. In other words, the movable through holes 41A and 41A are also provided side by side in the longitudinal direction of the groove-shaped energization restriction cover 20, and have the same shape as the fixed through holes 21B and 21B, for example.

  These fixed through holes 21B and 21B and the movable through holes 41A and 41A constitute a bottom film thickness adjusting through hole. By sliding the bottom slide plate 41 with respect to the under cover member 21, the bottom film thickness adjusting through hole is formed. The opening area of the mouth (that is, the area of the overlapping portion between the fixed through holes 21B and 21B and the moving through holes 41A and 41A) can be adjusted.

  Other configurations are the same as those in the first embodiment, and thus a duplicate description is omitted. The configuration of this embodiment also provides the same effect as that of the first embodiment. In addition, according to the present embodiment, the thickness of the coating film in the part of the coating target work W that faces the bottom wall (under cover member 21) of the groove-shaped energization restriction cover 20 is determined as the bottom film thickness adjusting through-hole. The opening area can be adjusted.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first and second embodiments described above, the pair of eaves walls 25, 25 are provided in the groove-type energization restriction cover 20, but these eaves walls 25, 25 may not be provided. Alternatively, the eaves wall 25 may be provided only on one cover side wall 23.

  (2) In the first and second embodiments, the pair of cover side walls 23, 23 are provided with the film thickness adjusting through holes 23A. However, the film thickness adjusting through holes 23A may not be provided. . Alternatively, only one cover side wall 23 may be provided with a film thickness adjusting through hole 23A. In addition, it is preferable to provide a wall 25 on the cover side wall 23 provided with the film thickness adjusting through hole 23A.

  (3) In the first and second embodiments, the groove-type energization regulating cover 20 is configured to reciprocate in the depth direction of the groove (see FIG. 3A), but the position of the groove in the depth direction is It may be fixed.

  (4) In the first and second embodiments, the slide plate 32 constituting the cover side wall 23 slides in the longitudinal direction of the groove-shaped energization restriction cover 20 with respect to the base plate 30. As shown, the slide plate 32 may be configured to slide in the depth direction (vertical direction) of the groove-shaped energization restriction cover 20.

  (5) In the first and second embodiments, the first through hole 30 </ b> A of the base plate 30 and the second through hole 32 </ b> A of the slide plate 32 are arranged in a line in the longitudinal direction of the groove-shaped energization restriction cover 20. However, the first through holes 30A and the second through holes 32A may be arranged in a matrix (see FIG. 9) or a zigzag. Further, the shapes of the first through hole 30A and the second through hole 32A are not limited to a rectangle, and may be, for example, a circle (see FIG. 9).

  (6) In the first and second embodiments, the movable bar 52 is manually moved up and down with respect to the vertical post 51 of the stand 50 so that the groove-shaped energization restriction cover 20 in the bathtub body 11 is positioned in the vertical direction. However, as shown in FIG. 10, the groove-shaped energization restriction cover 20 is suspended by a plurality of wires 60, 60, and the wires 60, 60 are connected to the output rotation shafts of the motors 61, 61. As a configuration that can be wound around the wire reels 62, 62, the groove-shaped energization restriction cover 20 may be moved in the vertical direction. This configuration corresponds to the “cover moving mechanism” of the present invention.

  (7) The “variable opening width mechanism” according to the present invention may be configured as follows. That is, as shown in FIG. 11, guide recesses 20B and 20B having a U-shaped cross section extending in the groove width direction are formed at both ends in the longitudinal direction of the bottom wall of the groove-shaped energization regulating cover 20. . On the other hand, a pair of guide convex portions 23B and 23B projecting in opposite directions are integrally formed at the lower end portions of both cover side walls 23 and 23 in the groove-shaped energization regulating cover 20, and these guide convex portions 23B and 23B are integrally formed. Is slidably engaged with the guide recesses 20B and 20B. As a result, the pair of cover side walls 23, 23 can move in the groove width direction of the groove-shaped energization restriction cover 20. Although not shown in FIG. 11, the cover side wall 23 may be provided with the film thickness adjusting through hole 23 </ b> A and the wall 25 described in the first embodiment.

  (8) The groove-shaped energization restriction cover 20 of the above embodiment may be continuous from one end to the other end in the longitudinal direction of the bathtub main body 11, or a plurality of groove-shaped energization restriction covers 20 in the longitudinal direction of the bathtub main body 11. , 20 may be arranged in a line.

  (9) In the first and second embodiments, the pair of side cover members 22, 22 are connected to the under cover member 21 so as to be movable in the groove width direction, thereby opening the groove-shaped energization regulating cover 20. Although the width can be changed, as shown in FIG. 12, the opening width of the groove-shaped energization regulating cover 20 can be changed by providing the collar wall 25 so as to be movable in the opening width direction with respect to the cover side wall 23. Good.

  (10) In the first and second embodiments, the bathtub main body 11 and the groove-shaped energization restriction cover 20 have a groove-shaped structure extending in the horizontal direction, but the following structure may be employed. That is, the bathtub body 11 has a vertically long cylindrical shape with a bottom end and an open top, and a groove-shaped energization regulating cover 20 that extends vertically within the bathtub body 11 (in other words, In the state that the depth direction of the groove is parallel to the horizontal direction), the workpiece W to be painted is inserted from the upper end opening of the bathtub body 11, and a part of the workpiece W is received by the groove-shaped energization restriction cover 20 (necessary) Accordingly, the electrodeposition coating may be performed by further moving the painting target workpiece W up and down.

  (11) In the first and second embodiments, the opening width variable mechanism that can change the opening width of the groove-shaped energizing restriction cover 20 and the entire groove-shaped energizing restriction cover 20 can be moved in the depth direction of the groove. The cover moving mechanism is provided, but only the cover moving mechanism may be provided. Further, the cover moving mechanism may not be capable of moving the entirety of the groove-shaped energization regulating cover 20 in the depth direction of the groove. For example, the bottom wall of the groove-shaped energization regulating cover 20 is fixed, and 1 The configuration may be such that only the pair of cover side walls 23, 23 can be expanded and contracted in the depth direction of the groove of the groove-shaped energization regulating cover 20. Even in such a configuration, since the groove-shaped energization restriction cover 20 can be adapted to changes in the size and shape of the workpiece W to be painted, the size of the workpiece W to be painted is changed regardless of changes in the size and shape of the workpiece W to be painted. The film thickness can be reliably controlled according to the site.

  (12) Further, in the configuration including only the cover moving mechanism described above, the bathtub body 11 extends in the vertical direction and has a vertically long cylindrical shape with a bottom end and a bottom open, and the groove-shaped energization restriction cover 20 is the bathtub body. 11 is a groove-shaped structure extending in the vertical direction (in other words, a structure in which the depth direction of the groove is parallel to the horizontal direction), the workpiece W to be coated is inserted from the upper end opening of the bathtub body 11, and a part thereof is Electrodeposition coating may be performed in a state of being received in the groove-shaped energization restriction cover 20 (if necessary, the workpiece W to be coated is further moved up and down).

DESCRIPTION OF SYMBOLS 10 Bathtub for electrodeposition coating 11 Bathtub main body 12 Electrode 20 Groove-shaped energization regulation cover 20B Guide recessed part 21 Under cover member (cover bottom wall)
21A Bolt free fitting hole 23 Cover side wall 23A Thickness adjusting through hole 25 Wall wall 27 Bar fitting cylinder 28B Bolt 28N Nut 30 Base plate 30A First through port 32 Slide plate 32A Second through port 50 Stand 51 Vertical post 52 Movable Bar 53 Post fitting cylinder

Claims (8)

The electrodeposition coating liquid is stored and has an electrode arranged in the electrodeposition coating liquid, and energization is performed between the electrode to be coated and the electrode moving in the electrodeposition coating liquid, In the electrodeposition coating bathtub for performing electrodeposition coating on the surface of the workpiece to be painted,
A groove for forming a groove-like structure extending in the moving direction of the object to be coated and being submerged in the electrodeposition coating liquid, for receiving a part of the object to be coated and for restricting energization with the electrode An energization regulation cover,
An electrodeposition coating bathtub, comprising: an opening width variable mechanism capable of changing an opening width of the groove-shaped energization restriction cover according to the workpiece to be painted.   At least one of the pair of cover side walls facing each other in the groove width direction of the groove-shaped energizing restriction cover is separated from the cover bottom wall, and the one cover side wall is the groove width with respect to the cover bottom wall. The electrodeposition coating bathtub according to claim 1, wherein a mechanism for supporting movement in a direction is provided as the opening width variable mechanism.   The entire groove-shaped energization restriction cover can be moved in the depth direction of the groove, or a pair of cover side walls opposed in the groove width direction of the groove-shaped energization restriction cover can be expanded and contracted in the depth direction of the groove. The bathtub for electrodeposition coating according to claim 1 or 2, further comprising a cover moving mechanism. The electrodeposition coating liquid is stored and has an electrode arranged in the electrodeposition coating liquid, and energization is performed between the electrode to be coated and the electrode moving in the electrodeposition coating liquid, In the electrodeposition coating bathtub for performing electrodeposition coating on the surface of the workpiece to be painted,
A groove for forming a groove-like structure extending in the moving direction of the object to be coated and being submerged in the electrodeposition coating liquid, for receiving a part of the object to be coated and for restricting energization with the electrode An energization regulation cover,
The entire groove-shaped energization restriction cover can be moved in the depth direction of the groove, or a pair of cover side walls opposed in the groove width direction of the groove-shaped energization restriction cover can be expanded and contracted in the depth direction of the groove. An electrodeposition coating bathtub characterized by comprising a cover moving mechanism.   5. The film thickness adjusting through-hole is formed in at least one of the pair of cover side walls so as to communicate with the inside and outside of the groove-shaped energizing restriction cover and change an opening area. The bathtub for electrodeposition coating according to any one of claims. The cover side wall is composed of a base plate and a slide plate that is slidably held on the base plate so as to be slidable with respect to the base plate.
For adjusting the film thickness from a plurality of first through holes formed through the base plate and a plurality of second through holes formed through the slide plate at positions corresponding to the first through holes. 6. The electrodeposition coating bathtub according to claim 5, wherein the through-hole is configured.   The electrodeposition according to claim 5 or 6, further comprising a collar wall projecting inward in the opening width direction from a front end portion of the cover side wall provided with the film thickness adjusting through hole. Painting tub. The electrodeposition coating bathtub extends in the horizontal direction,
The coating object work can be linearly conveyed from one end position to the other end position in the longitudinal direction of the electrodeposition coating bath in a state of being suspended from above the electrodeposition coating bathtub,
The groove-shaped energization restriction cover is configured to extend in parallel with the electrodeposition coating bathtub and to receive a lower end portion of the workpiece to be painted. The electrodeposition coating bathtub described in the item.