JP6813889B2 - Manufacturing method of masking material, vacuum forming mold, masking material - Google Patents

Description

The present invention manufactures a masking material, a vacuum forming mold, and a masking material for protecting a masked portion to which the surface treatment should not be applied when surface treatment such as painting or plating is performed during the manufacture of an automobile or the like. It's about the method.

Conventionally, when applying a surface treatment such as painting to an article such as an automobile bumper, a door, or an instrument panel, masking that protects a masked portion such as an air intake port, a window frame, or a dashboard on the article from the surface treatment. As the material, there is provided a masking material in which a sheet material made of a thermoplastic resin is formed into a predetermined shape according to the masked portion by vacuum forming or the like (see, for example, Patent Documents 1 to 7). Then, the masking material is mounted on the article by being fitted, adhered to, or hooked on the masked portion, and is configured to cover and protect the surface of the masked portion. ing.
However, since the masking material is configured to protect only the front surface of the masked portion, if it is necessary to protect the masked portion not only from the front surface side but also from the back surface side, other cases may occur. It is necessary to use a masking material with the composition of. Then, as a masking material capable of protecting the masked portion not only from the front surface side but also from the back surface side, a material configured to accommodate the masked portion inside thereof is provided.
For example, the masking material of Patent Document 8 is composed of a plurality of plastic molded products, and by joining the plurality of plastic molded products to each other, a masked portion is inserted between the plurality of plastic molded products to protect the coating. It is configured.
The masking material of Patent Document 9 is made of a molded product of a plastic sheet, is divided into two parts, one end edge of each divided portion is hinged to each other, and the other end edge of each divided portion is interlocked with each other. A combination means is provided, and it is configured to surround the masked portion and protect its peripheral surface.

Japanese Unexamined Patent Publication No. 2002-187961 Japanese Unexamined Patent Publication No. 2004-155023 Japanese Unexamined Patent Publication No. 2004-188283 Japanese Unexamined Patent Publication No. 2004-261627 Japanese Unexamined Patent Publication No. 2007-0229929 JP-A-2007-069103 Japanese Unexamined Patent Publication No. 11-276950 Japanese Unexamined Patent Publication No. 2000-79363 Japanese Unexamined Patent Publication No. 11-300246

However, in the above-mentioned prior art, the masking material of Patent Document 8 has a problem that joining of a plurality of plastic molded products is complicated and it takes a long time to attach the masking material to the masked portion. The masking material of Patent Document 9 has a problem that it is difficult to form the engaging means into a predetermined shape by vacuum forming, and mass production is difficult.
The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is a masking material that is easy to attach to a masked portion and is easy to manufacture, a molding mold for vacuum forming, and a masking material. Is to provide a manufacturing method for.

As a means for solving the above-mentioned conventional problems, the invention of the masking material according to claim 1 includes a first member and a second member that sandwich and protect the masked portion, and the first member or the second member. Is provided with a concave portion, and the second member or the first member is provided with a convex portion capable of engaging with the concave portion, and the concave portion and the convex portion have a locking convex portion, respectively. The gist is that it is formed.
The invention according to claim 2 is the invention of the masking material according to claim 1, wherein the locking convex portion is on the inner peripheral surface of the opening of the concave portion and on the outer peripheral surface of the crown portion of the convex portion. The gist is that each is formed.
The invention according to claim 3 is the invention of the masking material according to claim 1 or 2, wherein the convex portion and the concave portion have a smaller cross-sectional area of the convex portion than the concave portion and are engaged with the same. It is a gist that a part of the outer peripheral surface of the convex portion is set to be in contact with the inner peripheral surface of the concave portion in the fitted state.
The invention according to claim 4 is the invention of the masking material according to any one of claims 1 to 3, wherein the first member and the second member have a hinge portion on one side of each other. It is a gist that it is connected via the above and is configured to be foldable in half around the hinge portion.
The invention of the vacuum forming mold according to claim 5 is a vacuum forming molding mold for producing the masking material according to any one of claims 1 to 4, and has a mold surface. It has a concave-convex shape corresponding to the shape of the masking material, and a plurality of vacuum holes for vacuum-adsorbing the molding material are provided on the mold surface, and the concave holes and the vacuum holes corresponding to the convex portions are provided. It is a gist that the locking convex portion is provided near the portion avoiding the portion where the locking convex portion is formed.
The invention of the masking material manufacturing method according to claim 6 is a method for manufacturing a masking material using the vacuum forming molding die according to claim 5, wherein the molding material is vacuum-adsorbed to the mold surface to vacuum-adhere the masking material. The gist is that the locking convex portion is formed by stretching and flexing the closely related portion of the vacuum hole of the molding material at a portion corresponding to the concave portion and the convex portion. ..

[Action]
The masking material of the present invention is configured to protect the masked portion not only from the front surface side but also from the back surface side by sandwiching and protecting the masked portion between the first member and the second member. is there. In the masking material, the first member or the second member is provided with a concave portion, and the second member or the first member is provided with a convex portion capable of engaging with the concave portion. The masking material is attached to the masked portion by engaging the concave portion and the convex portion while sandwiching the masked portion between the first member and the second member to engage the first member and the second member. The easy task of combining is sufficient. Therefore, it is possible to easily attach the masking material to the masked portion. Further, a locking convex portion is formed in each of the concave portion and the convex portion, and when the respective locking convex portions are locked to each other, the engagement between the concave portion and the convex portion is unexpectedly released. It can be suppressed (claim 1).

Further, the locking convex portion is formed on the inner peripheral surface of the opening of the concave portion and on the outer peripheral surface of the crown portion of the convex portion, whereby the engagement between the concave portion and the convex portion is released. Since the locking convex portions are preferably locked to each other in a state where they are likely to be formed, it is possible to suitably suppress the disengagement between the concave portion and the convex portion (claim 2).
Further, when the convex portion and the concave portion have a smaller cross-sectional area of the convex portion than the concave portion and are engaged with each other, a part of the outer peripheral surface of the convex portion comes into contact with the inner peripheral surface of the concave portion. When the shape is set, the concave portion and the convex portion can be easily engaged (claim 3).
Further, when one side edge of the first member and the second member are connected by a hinge portion and the first member and the second member can be folded in two around the hinge portion, the first member is described. Since it is not necessary to perform complicated work such as supporting one of the first member and the second member with one hand and aligning the other with the other hand, it is easier to attach the masking material to the masked portion. (Claim 4).

In the vacuum forming molding die for manufacturing the masking material, a vacuum hole for vacuum-adsorbing the molding material is provided at a close edge of the place where the locking convex portion is formed. No unevenness is formed on the surface for forming the locking convex portion. Therefore, fine adjustment of the molding die for forming the locking convex portion is not required, and the manufacturing of the vacuum forming molding die can be simplified (claim 5).
At the time of manufacturing the masking material using the vacuum forming molding die, the stretching and bending is performed by stretching and flexing the closely related portion of the vacuum hole of the molding material at a portion corresponding to the concave portion and the convex portion. The portion is formed as the locking convex portion. Therefore, since the locking convex portion can be formed without being particularly conscious of it, the production of the masking material can be simplified (claim 6).

〔effect〕
According to the present invention, it is possible to provide a masking material, a molding mold for vacuum forming, and a method for manufacturing a masking material, which are easy to attach to a masked portion and are easy to manufacture.

(A) is a front view, (b) is a bottom view, and (c) is a reference perspective view at the time of mounting, showing the masking material of the embodiment. (A) shows a concave portion is a normal sectional view, and (b) is a plan sectional view. (A) showing a convex portion is a normal sectional view, and (b) is a plan sectional view. (A) to (c) are side sectional views showing a state in which a convex portion is engaged with a concave portion, and (d) is a normal sectional view showing a state in which a convex portion is engaged with a concave portion. (A) shows a molding die for vacuum forming of an embodiment, and (b) and (c) are an enlarged plan view of a part of (a). (A) and (b) are explanatory views in cross section showing a state in which a locking convex portion is formed.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings.
As shown in FIGS. 1A to 1C, the masking material 10 includes a first member 11 and a second member 12. The first member 11 and the second member 12 are each formed in a horizontally long square shape when viewed from the front. One side edge (inner edge) of the first member 11 and the second member 12 is connected to each other via a hinge portion 13. The masking material 10 is configured to be foldable in half around the hinge portion 13.
The first member 11 is formed with a first uneven portion 11A having a shape corresponding to the back surface of the masked portion 14 (omitted in FIG. 1C). A second uneven portion 12A having a shape corresponding to the surface of the masked portion 14 is formed on the second member (omitted in FIG. 1C). The masking material 10 can sandwich the masked portion 14 between the first member 11 and the second member 12 in a state of being folded in half around the hinge portion 13. The back surface of the masked portion 14 sandwiched between the first member 11 and the second member 12 is covered with the first uneven portion 11A of the first member 11, and the front surface of the second member 12 is covered. By covering with the second uneven portion 12A, both the front surface side and the back surface side are protected.
A recess 15 is formed in the other side edge portion (outer edge portion) of the first member 11 by denting the first member 11 toward the back surface side. A convex portion 16 is formed on the other side edge portion (outer edge portion) of the second member 12 by projecting the second member 12 toward the front surface. The concave portion 15 and the convex portion 16 are provided at symmetrical positions when the masking material 10 is viewed from the front. Then, the concave portion 15 and the convex portion 16 are configured to be engaged with each other in a state where the masking material 10 is folded in half around the hinge portion 13.
The masking material of the present invention is not limited to providing the concave portion 15 in the first member 11 and the convex portion 16 in the second member 12 as described above, but also provides the convex portion 16 in the first member 11. The recess 15 may be provided in the two members 12. Further, the hinge portion 13 is omitted, the first member 11 and the second member 12 are formed as separate bodies, and the first member 11 and one side edge (inner edge) of the second member 12 are also described above. The concave portion 15 and the convex portion 16 of the above may be provided so as to be engaged with each other, and the first member 11 and the second member 12 may be connected to each other.

As shown in FIGS. 2A and 2B, the recess 15 is formed in the shape of a regular quadrangular bottomed hole when viewed from the front. The convex portion 16 is inserted into the concave portion 15 in the depth direction of the concave portion 15 and is configured to be engaged with the concave portion 15. Further, a plurality of contact portions 15A are formed on the inner surface of the recess 15 so as to form a convex shape extending in the depth direction of the recess 15.
A first locking convex portion 17 is provided on the inner peripheral surface of the opening of the concave portion 15. The first locking convex portion 17 is formed so as to project inward of the concave portion 15, and the opening of the concave portion 15 is slightly narrowed.
As shown in FIGS. 3A and 3B, the convex portion 16 is formed in a circular covered cylinder shape when viewed from the front. The convex portion 16 is configured to be inserted inside the concave portion 15 in the height direction thereof and to be engaged with the concave portion 15.
A second locking convex portion 18 is provided on the outer peripheral surface of the crown portion of the convex portion 16. The second locking convex portion 18 is formed so as to project outward from the convex portion 16, and the crown portion of the convex portion 16 is slightly widened.

When engaging the concave portion 15 with the convex portion 16, as shown in FIG. 4A, the crown portion of the convex portion 16 is pressed against the opening of the concave portion 15 to lock the second portion. The convex portion 18 is brought into contact with the first locking convex portion 17. When the crown portion of the convex portion 16 is pressed against the opening of the concave portion 15 with further force from this state, the second locking convex portion 18 becomes the first locking convex portion as shown in FIG. 4 (b). Overcome 17. Then, as shown in FIG. 4C, the convex portion 16 is inserted inside the concave portion 15 due to the momentum when the second locking convex portion 18 gets over the first locking convex portion 17, and the said. The concave portion 15 and the convex portion 16 are engaged with each other.
As shown in FIG. 4D, the convex portion 16 formed in a circular shape in a front view has an area of a cross section in the insertion direction into the recess 15 as compared with the concave portion 15 formed in a regular quadrangle in a front view. Is getting smaller. In this way, by making the area of the cross section of the convex portion 16 in the insertion direction into the concave portion 15 smaller than the area of the cross section of the concave portion 15, the convex portion 16 can be easily inserted into the concave portion 15. Further, when the convex portion 16 is inserted into the concave portion 15, the sliding resistance of the convex portion 16 with respect to the concave portion 15 can be reduced.

The outer diameter R (see FIG. 3A) of the convex portion 16 in front view is set to substantially the same length as the inner width W (see FIG. 2A) of the concave portion 15 in front view. ing. Therefore, in a state where the convex portion 16 is engaged with the concave portion 15, a part of the outer peripheral surface of the convex portion 16 is in contact with the inner surface surface of the concave portion 15. Since friction is generated between a part of the outer peripheral surface of the convex portion 16 and the inner surface of the concave portion 15 that are in contact with each other in this way, the engaged state between the concave portion 15 and the convex portion 16 is preferably maintained. To.
Further, the contact portion 15A is provided on the inner surface of the recess 15. The contact portion 15A abuts on the outer peripheral surface of the convex portion 16 in a state where the concave portion 15 and the convex portion 16 are engaged with each other, and causes friction between the concave portion 15 and the convex portion 16. The engagement state between the concave portion 15 and the convex portion 16 is well maintained.

The first locking convex portion 17 and the second locking convex portion 18 prevent the concave portion 15 and the convex portion 16 from being unexpectedly disengaged from each other. That is, when the convex portion 16 tries to come out of the concave portion 15 due to an impact applied to the masking material 10, the second locking convex portion 18 is locked to the first locking convex portion 17. In this state (see FIG. 4B), the protrusion 16 is restricted from coming out of the recess 15.
Further, in the first locking convex portion 17 and the second locking convex portion 18, the concave portion 15 and the convex portion 16 are engaged with each other when the concave portion 15 and the convex portion 16 are engaged with each other. It also functions as a confirmation means to confirm that. That is, when the concave portion 15 and the convex portion 16 are engaged with each other, before and after the second locking convex portion 18 gets over the first locking convex portion 17, a response transmitted to the operator when a force is applied. Changes greatly. Further, when the second locking convex portion 18 gets over the first locking convex portion 17, a sliding noise is generated. Therefore, due to the change in response or the generation of sliding noise, the operator does not have to visually check the concave portion 15 and the convex portion 16, but the concave portion 15 and the convex portion 16 are in an engaged state. Can be confirmed.

The masking material 10 is formed by vacuum forming using a vacuum forming molding die.
As shown in FIG. 5A, in the vacuum forming molding die 20, the mold surface 21 has an uneven shape corresponding to the shape of the masking material 10. Further, on the mold surface 21, a plurality of vacuum holes 22 for vacuum-adsorbing the molding material on the mold surface 21 are provided.
As shown in FIG. 5B, a hole 23 is formed in a concave shape on the mold surface 21 at a position corresponding to the concave portion 15 of the masking material 10. The hole 23 is not provided with irregularities for forming the first locking convex portion 17, and the vacuum hole 22 avoids a portion where the first locking convex portion 17 is formed. , It is provided at the four corners and the center of the bottom surface of the hole 23, which is a close edge position of the portion, and at the center of each side.
As shown in FIG. 5C, a pillar portion 24 is formed in a convex shape at a portion corresponding to the convex portion 16 of the masking material 10 on the mold surface 21. The pillar portion 24 is not provided with irregularities for forming the second locking convex portion 18, and the vacuum hole 22 avoids a portion where the second locking convex portion 18 is formed. , It is provided at the center of the base and the top surface of the pillar portion 24, which is a position closely related to the location.

At the time of vacuum forming, a sheet-shaped molding material that has been heated and softened is placed on the vacuum forming molding die 20, air is sucked from the vacuum hole 22, and the molding material is vacuum-adsorbed on the mold surface 21. As a result, the molding material has a shape corresponding to the mold surface 21, and the masking material 10 is formed.
The molding material is not particularly limited as long as it is softened by heating and can be used for vacuum forming. As the molding material, a sheet of thermoplastic plastic such as polystyrene, polyethylene, polypropylene, ethylene-propylene copolymer, polyvinyl chloride, vinylidene chloride copolymer, ethylene-vinyl acetate copolymer, thermoplastic polyester, or polyamide, Polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyphenylene oxide, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyether ether ketone, crystalline polyester, polyamideimide, polyimide, polyetherimide, polyaminobismaleimide , Methylpentene copolymer, a sheet of engineering plastic such as cellulose acetate, a sheet of a mixture of two or more of the above plastics, or a laminate of two or more of the above plastic sheets is exemplified.

At the time of the vacuum forming, the first locking convex portion 17 and the second locking convex portion 18 are formed by stretching and bending of the molding material 25. This will be described below.
As shown in the upper part of FIG. 6A, in the hole portion 23, the heated / softened molding material 25 is stretched so as to be drawn into the hole portion 23 by suction of air from the vacuum hole 22. Next, as shown in the middle stage of FIG. 6A, since the vacuum suction force is the strongest in the hole 23 in the immediate vicinity of the vacuum hole 22, the molding material 25 drawn into the hole 23 is , It is strongly sucked to the bottom surface of the hole 23, and expands and bends in the hole 23. As shown in the lower part of FIG. 6A, the molding material 25 is vacuum-adsorbed to the bottom surface and the side surface of the hole 23, and these shapes are accurately transferred. Then, since the suction force in the hole 23 becomes weaker as the distance from the vacuum hole 22 increases, the molding material 25 is not sufficiently vacuum-adsorbed at the opening edge of the hole 23, and the bending remains. Therefore, the deflection is formed as the first locking convex portion 17.
As shown in the upper part of FIG. 6B, in the pillar portion 24, the heated / softened molding material 25 extends along the outer surface of the pillar portion 24 by suction of air from the vacuum hole 22. Next, as shown in the middle stage of FIG. 6B, the molding material 25 extending along the outer surface of the pillar portion 24 is centered on the top surface of the pillar portion 24 provided with the vacuum hole 22. , The force of vacuum suction acts most strongly at the root of the pillar 24, and stretches and bends between the center of the top surface of the pillar 24 and the root of the pillar 24. As shown in the lower part of FIG. 6B, the molding material 25 is vacuum-adsorbed to the center of the top surface of the pillar portion 24 and the root of the pillar portion 24, and these shapes are accurately transferred. Then, the suction force by the vacuum hole 22 is weak at the center of the top surface of the pillar portion 24 and the upper edge of the pillar portion 24 which is substantially the center position of the base of the pillar portion 24, and the molding material 25 is sufficiently vacuum-sucked. Therefore, the molding material 25 remains in a state where the bending remains at the upper end peripheral edge of the column portion 24, and the bending is formed as the second locking convex portion 18.

According to the method for producing a masking material, a molding mold for vacuum forming, and a masking material of the present invention, it is easy to install and easy to manufacture, so that it can be industrially used.

10 Masking material 11 1st member 12 2nd member 13 Hinge part 14 Masked part 15 Concave part 16 Convex part 17 1st locking convex part 18 2nd locking convex part 20 Vacuum forming molding mold 21 Mold surface 22 Vacuum hole 23 Hole 24 Pillar 25 Molding material

Claims (6)

A first member and a second member that sandwich and protect the masked portion are provided, and the first member or the second member is provided with a recess, and the second member or the first member has the recess. A convex portion that can be engaged with is provided, and a locking convex portion is formed in the concave portion and the convex portion, respectively .
The masking material is characterized in that the locking convex portion is formed on the inner peripheral surface of the opening of the concave portion and on the outer peripheral surface of the crown portion of the convex portion, respectively . The convex portion and the concave portion have a shape in which the cross-sectional area of the convex portion is smaller than that of the concave portion and a part of the outer peripheral surface of the convex portion contacts the inner peripheral surface of the concave portion in an engaged state. The masking material according to claim 1, which is set. The masking material according to claim 2, wherein the concave portion is formed in a regular quadrangle in a front view, and the convex portion is formed in a circular shape having a smaller area than the regular quadrangle of the concave portion in a front view. Of claims 1 to 3, the first member and the second member have one side edge connected to each other via a hinge portion, and are configured to be foldable in half around the hinge portion. The masking material according to any one item. A molding die for vacuum forming for producing the masking material according to any one of claims 1 to 4.
The mold surface has an uneven shape corresponding to the shape of the masking material, and a plurality of vacuum holes for vacuum-adsorbing the molding material are provided on the mold surface, and the concave portion and the portion corresponding to the convex portion are described. A molding die for vacuum forming, wherein the vacuum hole is provided at a close edge of the place where the locking convex portion is formed. A method for producing a masking material using the vacuum forming molding die according to claim 5.
When the molding material is vacuum-adsorbed to the mold surface to form the shape of the masking material, the closely related portion of the vacuum hole of the molding material is stretched and flexed at a portion corresponding to the concave portion and the convex portion. A method for producing a masking material, which comprises forming the locking convex portion.

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