JP2008100168A - Masking jig for coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a masking jig for coating of which the jig itself for coating is removable at a touch from each bolt aperture of a cover member and which retains the sealing properties properly to make the uncoated part by inhibiting the shift of position of the jig itself to the bolt apertures. <P>SOLUTION: In the masking jig for coating having a plurality of the bolt apertures and making the uncoated part at the surroundings of each bolt aperture in the covering member for the purpose of making conductible of the covering member made of a metal on which the surface is applied with the electrical insulation coating and the individual bolt to be fastened by inserting the same into each bolt aperture, it is characterized by being provided with the jig itself 10 using a magnet 14, a projection part 24 which is installed projectively from the absorption surface 11 of the jig itself and which positions the jig itself 10 by inserting it into the bolt apertures and a sealing member 30 installed on the absorption surface 11 of the jig itself. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a cover member in which an insulating coating is coated on the surface thereof and a non-coating portion for energization (body earth) is formed around each bolt hole, like a metal lid in an inverter case for a vehicle. The present invention relates to a masking jig for painting.

  A technique for creating a non-coating portion on this type of cover member is disclosed in Patent Document 1, for example. As is apparent from this technique, the metal cover member has a plurality of bolt holes, and an electrically insulating coating is applied to the surface of the cover member by cationic coating. And by making the non-coating part which does not have an insulating film around each bolt hole, it is possible to energize the cover member and individual bolts inserted into the bolt holes and tightened to the case side. Thereby, the cover member is body-grounded through each bolt. The reason why this body earth is required is as follows.

  A component that houses an electrical component, such as an inverter case or a converter case, and that has a voltage boosting function or a current rectifying function inside is filled with a current that is constantly generated, and static electricity is likely to occur around the case. In order to prevent this, it is necessary to release the full current, which is dealt with by the body earth of the cover member.

Conventionally, a masking part made of heat-resistant silicone rubber has been used as one means for creating a non-painted portion around the bolt hole. This masking component has an anchor portion inserted into the bolt hole and a seal portion that contacts the periphery of the bolt hole. Therefore, prior to coating the cover member, set the cover member on a rotary work table, and rotate the work table while inserting the anchor parts of the masking parts into the individual bolt holes one after the other. Pull with a pliers. Thereby, a seal | sticker part is stuck to the circumference | surroundings of a bolt hole. And after the coating process with respect to a cover member is completed, each masking member is sequentially removed from each bolt hole, rotating a work table.
JP 2005-327991 A

  In order to ground a cover member such as an inverter case, it is required to create a non-painted portion around almost all bolt holes, and one cover member has a dozen or more bolt holes. For all these bolt holes, a large number of work steps are required to attach and remove the masking parts one by one using a tool such as a pliers. Further, the masking part made of silicon rubber or the like is likely to be displaced with respect to the bolt hole due to its flexibility, and the non-painted part may be displaced from the periphery of the bolt hole.

  An object of the present invention is to solve such problems. The purpose of the present invention is to make it possible to detach the masking jig main body with respect to each bolt hole of the cover member with one touch, and to position the jig main body with respect to the bolt hole. It is to keep the sealing property for preventing the deviation and creating the non-painted portion.

The present invention is for achieving the above object, and is configured as follows.
The first invention is capable of energizing a metal cover member having a plurality of bolt holes and having an electrically insulating coating coated on the surface, and individual bolts that are inserted into the bolt holes and tightened. For this purpose, a masking jig for coating for creating a non-coating portion around each bolt hole in the cover member, which is provided to protrude from the jig main body using the magnet and the adsorption surface of the jig main body, A protrusion for positioning the jig main body on the cover member by being inserted into the bolt hole, and a seal member provided on the suction surface of the jig main body are provided.

  In this configuration, the jig main body can be attached to the location of each bolt hole in the cover member by its magnetic force, so that the jig main body can be attached to and detached from the plurality of locations with one touch without using a tool or the like. Accordingly, since the non-painted portion is formed around each bolt hole, the number of man-hours can be greatly reduced. In addition, the protrusion provided on the suction surface of the jig main body is inserted into the bolt hole of the cover member, so that the bolt hole and the jig main body are positioned, and the seal for creating the non-coating portion by the seal member Good properties are maintained.

According to a second aspect, in the first aspect, a fluororubber foam is used for the seal member.
By using a sealing member made of a fluoro rubber foam material in this way, the conformability to the surface of the cover member is good, and even when the cover member has processing distortion, etc., it maintains a good sealing property, The penetration of the paint can be prevented.

  According to a third invention, in the first invention, the jig body has a structure in which a magnet is incorporated in a bottomed cylindrical holder, and the edge of the holder on the suction surface side of the jig body is attached to the magnet body. The seal member is set so as to protrude from the end face and sandwiched between the edge of the holder and the cover member.

  In this configuration, the attracting force based on the magnetic force of the jig body is concentrated on the edge of the holder, and the seal member can be pressed against the cover member with a high surface pressure. For this reason, when the magnetic force of the jig body is constant, the sealing function is remarkably enhanced as compared with the case where the sealing member is pressed against the cover member over the entire suction surface. As a result, good sealing performance can be ensured even when a silicon resin sealing member that is advantageous from the viewpoint of heat resistance and durability is used.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
Embodiment 1
First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an external perspective view showing one type of coating masking jig. FIG. 2 is a longitudinal sectional view of the masking jig for painting. The jig main body 10 shown in these drawings uses an existing permanent magnet, and its structure is roughly divided into a holder 12 and a magnet 14 incorporated in the holder 12. The holder 12 is formed into a cylindrical shape having a bottom using a material such as stainless steel. The magnet 14 is a super heat resistant and strong magnetic permanent magnet, and a cylindrical body 16 made of a nonmagnetic material such as brass is interposed between the outer peripheral surface of the magnet 14 and the inner peripheral surface of the holder 12. It is fixed. This configuration is a well-known configuration for effectively exerting an attracting force based on the magnetic force of the magnet 14 on the attracting surface 11 of the jig body 10.

  In the jig body 10, a through hole 18 that communicates from the suction surface 11 to the bottom surface of the holder 12 is processed at the center. The pilot pin 20 is inserted into the through hole 18 from the suction surface 11 side. The pilot pin 20 is made of a material such as stainless steel or brass. The pilot pin 20 includes an insertion portion 22 that is inserted into the through hole 18 and a projection 24 that has a larger diameter than the insertion portion 22 and protrudes from the suction surface 11. A screw hole 26 is machined from the end surface of the insertion portion 22. The pilot pin 20 is fixed to the jig body 10 by tightening the screw 28 together with the washer 29 from the bottom side of the holder 12 into the screw hole 26.

  In the jig body 10, a plurality of types of magnets having different magnetic forces of the magnets 14, that is, different attractive forces of the attracting surfaces 11 are prepared. Due to the difference in type, the diameter or height of the jig body 10 is different. 1 and 2 show one type of jig body 10. In addition, since the length of the through-hole 18 changes according to the height of the jig body 10, various types of pilot pins 20 having different lengths of the insertion portion 22 are prepared accordingly.

  A circular seal member 30 is disposed concentrically with the through hole 18 on the suction surface 11 of the jig body 10. That is, the seal member 30 has a center hole 32, and the insertion portion 22 of the pilot pin 20 is passed through the center hole 32. When the pilot pin 20 is fixed to the jig body 10 in this state, the periphery of the center hole 32 in the seal member 30 is sandwiched between the suction surface 11 of the jig body 10 and the protrusion 24 of the pilot pin 20. As a result, the seal member 30 is held so as not to drop off from the suction surface 11 of the jig body 10. As the material of the seal member 30, a heat-resistant silicone resin or a heat-resistant foamed epoxy sealer (fluorine rubber foam material) is used. In some cases, two or more seal members 30 are used in an overlapping manner in order to improve the sealing performance.

  FIG. 3 is a plan view showing a part of a cover member 40 such as an inverter case or a converter case. The cover member 40 is a metal member used as a lid for closing an opening of a metal case (not shown) such as an inverter case, and the contour shape thereof corresponds to the shape of the opening of the metal case. A plurality of (generally a dozen) bolt holes 42 are formed in the periphery of the cover member 40, and the cover member 40 is fixed to the metal case by bolts (not shown) tightened through these bolt holes 42. Is done.

  The surface of the cover member 40 is electrically insulated by cation coating or anion coating. However, for the reasons already described, it is necessary to create a non-painted portion without an insulating coating around each bolt hole 42 and perform body earthing of the cover member 40 through each bolt tightened through these bolt holes 42.

Next, the procedure of insulation treatment for the cover member 40 will be described.
First, the jig body 10 is prepared in a number that excludes all of the bolt holes 42 in the cover member 40 or one or two holes that do not require body earth. At this time, the jig main body 10 having a suction force according to the surface accuracy of the cover member 40 is selected from a plurality of types, and the seal member 30 is used as a single sheet or two or more according to the surface accuracy of the cover member 40. Select whether to use multiple layers. In addition, it is natural that the masking range (the range of the non-coating portion) can be adjusted by changing the outer diameter of the seal member 30.

  When the type of the jig main body 10 to be used is determined, the jig main body 10 of the already selected type is attached to the periphery of each bolt hole 42 that requires masking in the cover member 40 as shown in FIG. At this time, as shown in FIG. 5, the jig body 10 is positioned in a centered state with respect to the bolt hole 42 by inserting the protrusion 24 of the pilot pin 20 into the bolt hole 42. At the same time, the attracting surface 11 of the jig body 10 is attracted to the cover member 40 side by the magnetic force of the magnet 14. As a result, the seal member 30 is strongly pressed around the bolt hole 42 (FIG. 5), and the portion is kept masked.

  After cleaning the cover member 40 with the jig body 10 attached to each bolt hole 42 that requires masking, an insulating coating 44 (FIG. 6) is applied to the surface of the cover member 40 by, for example, electrodeposition cation coating. Next, the cover member 40 is heated to perform the baking treatment of the insulating coating 44, and after cooling, each jig body 10 is removed from the cover member 40. As a result, as shown in FIG. 6, the non-painted portion 46 without the insulating coating 44 is formed around the bolt hole 42 in the cover member 40 in the range of the size almost the same as that of the seal member 30. Therefore, when the bolt is fastened to the metal case through the bolt hole 42 in which the non-coating portion 46 is formed, the cover member 40 is body-grounded using the bolt as a current-carrying path.

  By attaching the jig body 10 to each bolt hole 42 with respect to the cover member 40 and attaching the jig body 10 by the magnetic force of the magnet 14 as described above, the attachment and detachment of the plurality of jig bodies 10 can be performed with one touch without using a tool or the like. Can be done. Therefore, the man-hour for masking is significantly reduced. In addition, the sealing member 30 using a foamed eptosealer (a foamed material of fluororubber) has good conformability to the surface of the cover member 40, maintains a good sealing property by cooperating with the adsorption force of the jig body 10, and Infiltration of the paint into the coating part 46 is prevented. However, when the surface accuracy of the cover member 40 is high and there is no processing distortion, a seal member 30 made of silicon resin may be used.

Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 7 is an external perspective view showing the masking jig for painting in the second embodiment. FIG. 8 is a longitudinal sectional view showing the coating masking jig of FIG. As is apparent from these drawings, in the jig body 10 of the second embodiment, a super heat resistant and strong magnetic permanent magnet is formed inside a holder 12 formed into a bottomed cylindrical shape by a material such as stainless steel. The magnet 14 using is incorporated. On the suction surface 11 side of the jig body 10, that is, on the open surface side of the holder 12, the edge 13 of the holder 12 is slightly protruded from the end surface 14 a of the magnet 14.

  On the other hand, the outer diameter of the seal member 30 of the second embodiment is set to be approximately the same as the outer diameter of the jig body 10, and the pilot hole 20 is inserted into the center hole 32 as in the first embodiment. 22 is passed (FIG. 8). The seal member 30 may be made of a silicone resin, not a foamed eptosealer having excellent conformability to the surface of the cover member 40. Since the sealing member 30 made of silicon resin is harder to break than the foamed epoxy sealer and has a high heat resistant temperature, it is suitable for masking of baking coating. Further, the greater the thickness of the silicone resin, the higher the heat resistance and the less likely it is torn. Therefore, the thickness of the sealing member 30 is preferably set to about 1.0 to 1.5 mm.

  Assuming that the jig main body 10 in the second embodiment is attached to the cover member 40 (FIGS. 3 and 4) with the seal member 30 removed, the jig main body 10 is attached to the cover member 40 on the suction surface 11 side of the jig main body 10. Only the end face of the edge 13 in the holder 12 comes into contact. Accordingly, the attracting force of the jig body 10 based on the magnetic force of the magnet 14 is concentrated on the edge 13 of the holder 12, and the seal member 30 is actually interposed between the edge 13 and the cover member 40. The seal member 30 is strongly pressed against the cover member 40 with a high surface pressure. As a result, even if only one silicon resin sealing member 30 is used, the periphery of the bolt hole 42 in the cover member 40 can be effectively sealed, and the portion can be kept in the masking state.

External perspective view showing masking jig for painting Longitudinal section of masking jig for painting Plan view showing part of cover member The perspective view showing a part of the state which attached the masking jig to the cover member Sectional view with masking jig attached to cover member Sectional view with masking removed after painting External perspective view showing masking jig for coating in embodiment 2 Longitudinal section showing the masking jig for painting shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Jig body 11 Adsorption surface 14 Magnet 24 Projection part 30 Seal member 40 Cover member 42 Bolt hole 44 Insulating film 46 Non-coating part

Claims (3)

A cover member for the purpose of enabling energization of a metal cover member having a plurality of bolt holes and having an electrically insulating coating coated on the surface, and individual bolts inserted and tightened into the respective bolt holes. A masking jig for painting to create a non-painted part around each bolt hole in
A jig body using a magnet, a protrusion protruding from the adsorption surface of the jig main body, a protrusion for positioning the jig main body on the cover member by being inserted into a bolt hole of the cover member, and an adsorption surface of the jig main body A masking jig for painting provided with a seal member. The masking jig for painting according to claim 1,
A masking jig for painting, in which a foam material of fluoro rubber is used for the seal member. The masking jig for painting according to claim 1,
The jig body has a structure in which a magnet is incorporated into a cylindrical holder with a bottom, the edge of the holder on the adsorption surface side of the jig body protrudes beyond the end surface of the magnet, and the seal member is the edge of the holder. A masking jig for painting set in a shape to be sandwiched between a part and a cover member.

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