JP5519953B2 - Masking method - Google Patents

Description

The present invention relates to a masking method.

  As interior parts used in automobiles and homes, molded members with a skin having a three-layer structure of skin layer-foam layer-core material layer are frequently used. For the skin molding, an in-mold coating technique is used in which coating is performed in the mold. There are various types of in-mold coating technology. For example, paint is applied in a resin mold and a coating film is formed in advance (so-called mold coating). After the mold is clamped, a resin material is injected into the cavity. A method of molding a resin molded product integrated with a coating film in a resin mold is known.

  In general, the coating material is applied to the resin mold by placing a masking jig on the molding surface and determining an application region. The area where the masking jig is arranged is covered with the masking jig and prevents the paint from being applied. At this time, since the paint is applied to the outer surface of the masking jig, a coating film is formed (see Patent Document 1).

JP-A-5-261775

  If the masking jig coated with the coating material is used repeatedly, the coating film formed on the outer surface of the masking jig and the coating film formed on the molding surface may be continuously formed. When the coating film is continuously formed, when the masking jig is removed from the molding surface, the coating film formed on the molding surface is pulled together with the coating film formed on the outer surface of the masking jig. Peeling occurs and the appearance quality of the resin molded product is deteriorated.

The present invention has been made in order to solve the problems associated with the prior art described above, and when coating is applied to the coating area divided by the masking jig, the coating is continuous between the coating area and the masking jig. An object of the present invention is to provide a masking method capable of suppressing the formation of the resin and suppressing the deterioration of the appearance quality of the resin molded product.

The masking method according to the present invention that achieves the above object is a masking method in which a coating area where a paint is applied and a mask area where a paint is not applied are separated by a masking jig when applying the paint. It is. In the masking method, a flat part that covers the mask region is formed on a mold or a product in which a stepped portion is formed in the vicinity of the boundary between the coating region and the mask region. a rising portion that faces the vertical wall surface of projecting the stepped portion from the parts, and a projecting portion projecting above the coated surface of the coating region from the rising portion so as to cover at a distance to the coating region, the mask region from the rising portion Masking in which a reverse overhanging portion that protrudes to the side is formed , and a reverse overhanging portion that forms a discontinuous portion between the coating film formed on the overhanging portion and the coating film formed on the flat portion A jig is installed in the vicinity of the boundary region of the mold or product to apply paint.

  The masking method according to the present invention configured as described above uses a masking jig having an overhanging portion that covers the coating surface so as to cover the coating surface at an interval, and therefore, between the coating surface and the overhanging portion and between the vertical wall surface and the rising surface. It is suppressed that a coating film is continuously formed between the portions, and deterioration of the appearance quality of the resin molded product can be suppressed.

It is a flowchart which shows the process of the molding method of the resin molded product which concerns on 1st Embodiment. It is a perspective view which shows the instrument panel which is an example of a resin molded product. It is a perspective view which shows a part of shaping | molding apparatus of the resin molded product in 1st Embodiment. It is a perspective view which shows the masking jig | tool which concerns on 1st Embodiment. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which expands and shows a part of shaping | molding apparatus. It is sectional drawing for demonstrating the process of apply | coating a mold release agent. It is sectional drawing for demonstrating the process which arrange | positions a masking jig | tool. It is sectional drawing for demonstrating the process of apply | coating a dark color coating material. It is sectional drawing for demonstrating the process of removing a masking jig | tool. It is sectional drawing for demonstrating the process of apply | coating a light-colored coating material to a molding surface. It is sectional drawing for demonstrating the process of clamping a type | mold. It is sectional drawing for demonstrating the process of inject | pouring a resin material. It is sectional drawing for demonstrating the process of opening a type | mold, and the process of taking out the resin molded product. It is a perspective view which shows a part of shaping | molding apparatus in 2nd Embodiment. It is a perspective view which shows contrast with the shaping | molding apparatus in 2nd Embodiment. It is a perspective view which shows the other contrast with the shaping | molding apparatus in 2nd Embodiment. It is sectional drawing which shows a part of shaping | molding apparatus in 3rd Embodiment. It is sectional drawing which shows the modification of 1st Embodiment. It is sectional drawing which shows the coating film on the masking jig | tool of the modification of 1st Embodiment. It is sectional drawing which shows the proportionality of the masking jig | tool without an overhang | projection part and a reverse overhang | projection part. It is sectional drawing which shows the coating film on the masking jig | tool at the time of removing the masking jig | tool of proportionality.

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

<First Embodiment>
FIG. 1 is a flowchart showing steps of a method for molding a resin molded product according to the first embodiment. FIG. 2 is a perspective view showing an instrument panel which is an example of a resin molded product. FIG. 3 is a perspective view showing a part of a molding device for a resin molded product, and FIG. 4 is a perspective view showing a masking jig. 5 is a cross-sectional view taken along line AA in FIG. 3, FIG. 6 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 7 is a cross-sectional view showing an enlarged part of the molding apparatus. It is.

  3 to 7 show a reaction injection (RIM) molding apparatus 1 of the present embodiment. In this embodiment, the masking method and the masking jig 2 according to the present invention are applied to the RIM molding method and the RIM molding apparatus 1. The masking jig 2 is used to distinguish between the coating area S1 where the paint is applied and the mask area S2 where the paint is not applied when applying the paint to the resin mold 5 provided in the RIM molding apparatus 1. As the resin molded product 3 molded by the RIM molding apparatus 1, for example, a skin layer used for an instrument panel (see FIG. 2) of an automobile part having a three-layer structure of a skin layer, a foam layer, and a core material layer. Is mentioned.

  The masking jig 2 is a dark-colored coating that forms a surface layer of the resin molded product 3 on the molding surface 10 of the resin mold 5 on which the convex portions 4 that are convex to form the concave shape of the resin molded product 3 are formed. It is used when applying a dark paint 8 (corresponding to a paint) that forms a film 12 (corresponding to a coating film). The masking jig 2 has a masking jig 2 for distinguishing between an application region S1 where the dark paint 8 is applied to the molding surface 10 and a mask region S2 where the dark coating material 8 is not applied to the molding surface 10.

  The molding apparatus 1 for the resin molded product 3 includes a resin molding die 5 that forms a cavity 6 having a shape matching the resin molded product 3 by clamping, an injection unit that injects a molten resin material 34 into the cavity 6, Coating means 15 for applying the color paint 8, applying means 17 for the release agent for applying the release agent 16 to the resin mold 5, and masking jig 2 for defining the area where the dark paint 8 is applied And have.

  The resin mold 5 has a mold surface 21 for forming the cavity 6 between the mold mold 20 on which the mold surface 10 for forming the cavity 6 is formed and the mold surface 10 of the mold mold 20 by clamping. And a core mold 22 formed.

  The mold surface 10 of the mold 20 has a substantially concave cross section that is recessed with respect to the core mold 22, and has a convex portion 4 for forming a concave portion in the resin molded product 3. The mold 20 further includes a positioning recess 24 for positioning the masking jig 2 and a guide rod 25 for guiding the masking jig 2 to the positioning recess 24.

  The convex part 4 rises in a direction protruding from the molding surface 10, and forms a pair of first vertical wall surface 26 and second vertical wall surface 27, first vertical wall surface 26 (corresponding to a vertical wall surface), and second vertical wall surface 27. And an upper surface 28 having a planar shape located between the tips. The first vertical wall surface 26 is partitioned into a mask region S2, and the second vertical wall surface 27 and the upper surface 28 are partitioned into a coating region S1. Therefore, the convex portion 4 includes an upper surface 28 formed adjacent to the mask region S2 on the surface on the application region S1 side, and a first vertical wall surface 26 formed on the mask region S2 side by dropping from the upper surface 28. The step part 7 comprised from these is formed.

  The positioning concave portion 24 is provided so as to be freely fitted to a jig-side convex portion 30 provided in the masking jig 2. By positioning the masking jig 2 while fitting them together, the masking jig 2 can be positioned on the mold 20. A convex positioning convex portion is formed instead of the positioning concave portion 24 formed in the mold 20, and a concave jig side concave portion is formed in the masking jig 2 instead of the jig side convex portion 30. It may be formed and freely fitted.

  The guide rod 25 is inserted into the guide hole 31 formed in the masking jig 2 when the masking jig 2 is installed in the mold 20. Thereby, the masking jig 2 can be guided to an accurate position on the mold 20.

  The molding surface 21 of the core mold 22 has a substantially convex cross section that protrudes with respect to the mold 20, and has a recess 33 that is recessed corresponding to the convex 4 of the mold 20. The core mold 22 is provided so as to be movable toward and away from the mold mold 20. The resin mold 5 can be clamped by moving the core mold 22 closer to the mold mold 20 (indicated by the arrow a in FIGS. 5 and 6). By clamping the resin mold 5, the cavity 6 is formed between the molding surface 10 of the mold 20 and the molding surface 21 of the core mold 22. Further, the resin mold 5 can be opened by moving the core mold 22 away from the mold 20.

  The mold temperatures of the mold 20 and the core mold 22 are kept higher than the ambient temperature around the resin mold 5. This is to prevent the resin material 34 injected into the cavity 6 from being rapidly cooled and to obtain the resin molded product 3 having a shape that matches the inner surface shape of the cavity 6. The mold temperatures of the cavity mold 20 and the core mold 22 are maintained within a temperature range in which the resin material 34 can be prevented from being rapidly cooled by a heater (not shown) or the like.

  A general mixing head is used as the injection means. A molten resin material 34 is injected into the cavity 6 through a gate (not shown) by a mixing head. As the resin material 34, a urethane-based material generally used for polyurethane RIM molding is used.

  As the coating means 15 for paint, a commonly used paint spray gun is used.

  As the paint, a dark paint 8 for forming a relatively dark paint film on the outer surface of the resin molded product 3 and a light paint 9 having a lighter color than the dark paint 8 are used.

  Two types of paints with different shades are applied on the molding surface 10 of the mold 20 so as to form two parts with different shades on the surface layer of the resin molded product 3. As will be described later, in the molded resin product, a surface layer composed of the dark color coating film 12 is formed in the design appearance at a portion corresponding to the application region S1, and a light color coating is applied to a portion corresponding to the mask region S2. A surface layer made of the film 13 is formed (see FIG. 15).

  The dark color paint 8 is applied in a state where the masking jig 2 is arranged on the molding surface 10 and the application area S1 where the dark color paint 8 is applied and the mask area S2 where the dark color paint 8 is not applied are separated. .

  A release agent spray gun that is generally used is used as the release agent coating means 17. As the mold release agent 16, for example, wax used for mold release of the resin molded product 3, metal soap, other silicone mold release agents, or the like can be used.

  The masking jig 2 has a rising portion 38 provided with a jig end surface 37 facing the first vertical wall surface 26 of the stepped portion 7 provided in the mold 20 at the end of the substantially planar flat portion 36 covering the mold 20. Have. The rising portion 38 extends in a direction away from the molding surface 10 along the first vertical wall surface 26, and is stretched toward the coating region S 1 side so as to cover the upper surface 28 of the stepped portion 7 at the rising direction end portion of the rising portion 38. An overhang portion 39 is formed. When the masking jig 2 is disposed on the mold 20, the overhanging portion 39 is disposed with an interval X between the upper surface 28 (see FIG. 7).

  A reverse overhanging portion 40 extending to the side opposite to the overhanging portion 39 (mask region side) is formed at the rising direction end of the rising portion 38.

  When the jig end surface 37 of the rising portion 38 is disposed so as to face the first vertical wall surface 26, the jig end surface 37 has an upper space Y1 between the upper end 28 and the corner 42 on the upper surface 28 side. ing. Further, the jig end surface 37 has a lower space Y <b> 2 between the corner portion 43 on the lower end side of the jig end surface 37 and the first vertical wall surface 26. The upper interval Y1 is set larger than the lower interval Y2. The corner portion 43 of the jig end surface 37 is disposed so as to face the upper end portion 46 of the curved surface portion 45 formed at the skirt of the first vertical wall surface 26 or in the range where the curvature is formed, or the upper end portion 46. It is preferable to be arranged on the upper side.

  The mold surface 10 of the mold 20 has a concavo-convex shape for embossing the skin of the resin molded product 3. The masking jig 2 is in contact with the upper end side of the curved surface portion 45 of the convex portion 4. Therefore, it is preferable that the uneven shape is not formed. In addition, even if the uneven shape for embossing is not formed on the upper end side of the curved surface portion 45, this portion has the same shape as the recessed portion of the resin molded product 3, and therefore the appearance is hardly affected.

  The masking jig 2 is inserted into a jig-side convex portion 30 for positioning the masking jig 2 by fitting into the positioning concave portion 24 of the mold 20 and the guide rod 25 of the mold 20. It has a guide hole 31 and a gripping part 47 for the operator to grip and move.

  The masking jig 2 can be manufactured by molding a metal material such as iron. The material is not particularly limited and can be appropriately selected.

  In the present embodiment, the masking jig 2 has a substantially square shape, and when installed on the mold 20, three sides contact the mold 20, but the other side is the mold 20. Do not touch. The rising portion 38 is formed on one side that is not in contact with the mold 20. The guide hole 31 and the jig side convex portion 30 are formed on three sides in contact with the mold 20. That is, by supporting the masking jig 2 with the three sides that come into contact with the mold 20, the rising portion 38 can be arranged away from the stepped portion 7.

  Next, a method for molding the resin molded product 3 will be described.

  8 is a cross-sectional view for explaining the step of applying the release agent, FIG. 9 is a cross-sectional view for explaining the step of arranging the masking jig, and FIG. 10 is a step of applying the dark color paint. It is sectional drawing for demonstrating. FIG. 11 is a cross-sectional view for explaining the process of removing the masking jig, FIG. 12 is a cross-sectional view for explaining the process of applying a light-color paint to the molding surface, and FIG. 13 explains the process of fastening the mold. FIG. FIG. 14 is a cross-sectional view for explaining a step of injecting a resin material, and FIG. 15 is a cross-sectional view for explaining a step of opening a mold and a step of taking out a resin molded product.

  With reference to FIG. 1, the molding method of the resin molded product 3 can be summarized as follows: a step of applying a release agent 16 (S 1), a step of placing a masking jig 2 (S 2), and a dark color on the molding surface 10. It has a step (S3) of applying a paint and a step (S4) of removing the masking jig 2. In this molding method, after the step of removing the masking jig 2 (S4), the step of applying the light-colored paint 9 to the molding surface 10 (S5), the step of tightening the mold (S6), and the step of injecting the resin material 34 (S7), a step of opening the mold (S8), and a step of taking out the resin molded product 3 (S9). Hereinafter, the molding method of the resin molded product 3 will be described in detail.

  First, as shown in FIG. 8, a step of applying a release agent 16 is performed (S1). The mold 20 and the core mold 22 are opened, and the release agent 16 is applied to the molding surfaces 10 and 21. The release agent 16 is applied by a release agent spray gun as the application means 17.

  Next, as shown in FIG. 9, a step of arranging the masking jig 2 is performed (S2). The masking jig 2 is positioned by first holding and moving the gripping portion 47 of the masking jig 2, inserting the guide rod 25 of the mold 20 into the guide hole 31 of the masking jig 2, Along with this, the masking jig 2 is brought close to the mold 20. Thereby, the masking jig 2 can be accurately brought close to the mold 20 by the guide rod 25, and the masking jig 2 can be arranged with high accuracy without contacting the convex part 4 of the mold 20. it can. The masking jig 2 guided to the guide rod 25 has three sides in contact with the mold 20, and the jig-side convex part 30 is fitted into a positioning concave part 24 provided in the mold 20. Thereby, the masking jig 2 is positioned with high accuracy with respect to the stepped portion 7 of the mold 20.

  When the masking jig 2 is arranged, as shown in FIG. 7, the application region S <b> 1 and the mask region S <b> 2 are separated by a boundary line between the upper surface 28 and the first vertical wall surface 26 in the stepped portion 7. . The application region S1 is set in a range including the upper surface 28 and the second vertical wall surface 27 in the convex portion 4, and the mask region S2 is in a range covered by the first vertical wall surface 26 and the flat portion 36 of the masking jig 2. Is set.

  Next, as shown in FIG. 10, a step of applying the dark paint 8 to the molding surface 10 is performed (S3). The dark paint 8 is applied by a paint spray gun which is the application means 15.

  When the dark paint 8 is applied in the vicinity of the convex portion 4 that is the boundary between the application region S1 and the mask region S2, the spray gun for application is applied to the molding surface 10 from the application region S1 toward the mask region S2. Apply at an application angle θ of about 45 degrees. As a result, the dark paint 8 is applied to the application region S <b> 1 including the upper surface 28 and the second vertical wall surface 27 in the convex portion 4, and the dark paint film 12 is formed. The application angle θ is not limited to 45 degrees.

  Thereafter, as shown in FIG. 11, a step of removing the masking jig is performed (S4). After applying the dark paint 8, the masking jig 2 is removed from the mold 20.

  Here, FIG. 22 shows a comparative masking method in which the dark paint 8 is applied by dividing the coating region S1 and the mask region S2 with a masking jig having no overhanging portion and no reverse overhanging portion. Shows the coating film when removing the proportional masking jig. In addition, about the site | part which has the same function as this embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted in order to avoid duplication.

  As shown in FIG. 22, the rising portion 51 is formed in the masking jig 50 but is not formed as an overhanging portion, so that a large amount of the dark paint 8 is transferred to the masking jig 50 and the cavity. A large amount of dark paint 8 is supplied between the molds 20 and flows into the masking jig 50 and the first vertical wall surface 26, and masking may be incomplete.

  In order to prevent the paint from entering the mask region S2, it is necessary to reduce the distance between the jig end surface 52 of the rising portion 51 and the first vertical wall surface 26. However, when this distance is narrowed, the dark paint 8 applied to the upper surface 28 and the dark paint 8 attached to the jig end surface 52 are continuously formed. 23, the coating film 55 may be stretched or peeled off. Furthermore, when removing the masking jig 50, the coating film 55 peeled off from the masking jig 50 may fall onto the mold 20 and the quality of the resin molded product 3 may be deteriorated.

  Furthermore, in contrast, since the reverse overhanging portion is not formed, the coating film 55 is continuously formed on the masking jig 50. Therefore, when the masking jig 50 is washed, It is necessary to clean the whole or a wide range, and the work efficiency for cleaning is low.

  On the other hand, in this embodiment, as shown in FIG. 10, the overhanging portion 39 of the masking jig 2 is arranged with an interval X so as to cover the upper surface 28 of the stepped portion 7. Therefore, the flow of the dark color paint 8 between the first vertical wall surface 26 and the jig end surface 37 can be suppressed while allowing the dark color paint 8 to be applied on the upper surface 28 from the interval X. Furthermore, since the gap X is formed between the upper surface 28 and the overhanging portion 39, the coating film is continuous between the upper surface 28 and the overhanging portion 39 and between the first vertical wall surface 26 and the jig end surface 37. To be formed.

  Further, even if some dark color paint 8 flows between the first vertical wall surface 26 and the jig end surface 37, an upper interval Y1 and a lower interval Y2 are set between the first vertical wall surface 26 and the jig end surface 37. Therefore, it is suppressed that a coating film is continuously formed between the first vertical wall surface 26 and the jig end surface 37.

  Thus, the coating film becomes discontinuous between the upper surface 28 and the overhanging portion 39 and between the first vertical wall surface 26 and the jig end surface 37. Thus, the coating film is not peeled off from the masking jig 2 and dropped onto the mold 20. Therefore, it is possible to prevent the quality of the resin molded product 3 from being deteriorated and to prevent the appearance quality from being deteriorated due to irregularly formed light and shade portions on the surface layer formed by repeatedly applying paints having different shades.

  It should be noted that the distance X and the overhanging portion 39 of the overhanging portion 39 are set so that the amount of the dark paint 8 flowing from the upper space Y1 into the space between the first vertical wall surface 26 and the jig end surface 37 is not visually discernable. It is preferable to appropriately set the overhang length L, the upper space Y1, the lower space Y2, and the coating angle θ of the paint spray gun.

  Further, since the lower interval Y2 is set to be narrower than the upper interval Y1, even if the dark paint 8 flows from the upper interval Y1 into the space between the first vertical wall surface 26 and the jig end surface 37, it is smaller than the lower interval Y2. Furthermore, the inflow of the dark paint 8 downward can be suppressed. By arranging such a lower interval Y2 above the upper end portion 46 or the upper end portion 46 of the range where the curvature of the curved surface portion 45 of the first vertical wall surface 26 is formed, the range into which the dark paint 8 flows. In the resin molded product 3 can be suppressed within a range that is difficult to be visually recognized from the outside.

  Further, by providing the masking jig 2 with the reverse overhanging portion 40, the coating film 48 formed on the outer surface of the masking jig 2 below the reverse overhanging portion 40 when the dark paint 8 is applied. 49 are discontinuous. As a result, when the coating films 48 and 49 are formed on the masking jig 2, only the coating film 48 on the outer surface of the overhanging portion 39 and the reverse overhanging portion 40 can be easily cleaned. Work efficiency can be improved.

  In addition, this embodiment is good also as a form which does not form a reverse overhang | projection part like the modification of this embodiment shown in FIG. At this time, the coating film 61 on the masking jig 2 is continuously formed like the coating film 61 formed on the masking jig 60 in the modification shown in FIG. Although it falls, about the other than this, there can exist an effect similar to 1st Embodiment.

  After the step of removing the masking jig 2 (S4), as shown in FIG. 12, a step of applying the light color paint 9 to the molding surface 10 is performed (S5). On the application area S1 where the dark paint 8 is applied, a dark paint film 12 and a light paint film 13 are formed to overlap each other. The dark color coating film 12 prevents the light color coating film 13 from being seen through.

  Only the light color coating film 13 is formed in the mask area S2 where the dark paint 8 is not applied. A portion corresponding to the mask region S <b> 2 constitutes a surface layer made of the light-colored coating film 13.

  By covering the end portion of the dark color coating film 12 formed on the upper surface 28 of the convex part 4 with the light color coating film 13, the surface layer of the resin molded product 3 is formed in which the gap between the two is prevented from occurring. The

  Next, as shown in FIG. 13, a mold clamping step is performed (S6). The resin mold 5 is clamped by moving the core mold 22 closer to the mold 20. As a result, the cavity 6 having an inner surface shape that matches the outer shape of the resin molded product 3 is formed between the molding surface 10 of the mold 20 and the molding surface 21 of the core die 22.

  Next, as shown in FIG. 14, a step of injecting the resin material 34 is performed (S7). A molten resin material 34 is injected into the cavity 6 by a mixing head.

  Next, as shown in FIG. 15, a step of opening the mold is performed (S8). After the resin material 34 is cured and the resin molded product 3 integrated with the dark color coating film 12 and the light color coating film 13 is molded, the resin molding die 5 is opened.

  Finally, a step of taking out the resin molded product 3 is performed (S9). Thereby, the resin molded product 3 in which the surface layer composed of the dark color coating film 12 and the light color coating film 13 and the resin material 34 are integrated can be obtained.

  As described above, according to the present embodiment, since the overhanging portion 39 covers the upper surface 28 of the stepped portion 7 with an interval X, the space between the upper surface 28 and the overhanging portion 39, and the first vertical wall surface 26. In addition, it is possible to suppress the formation of the dark color coating film 12 between the rising portions 38 and the appearance quality of the resin molded product 3. Further, the masking jig 2 can be masked only by installing it in the mold 20 and, for example, it is not necessary to install the masking jig in the mold as a movable nesting structure. In other words, the degree of freedom of product on the surface of the mask region S2 is increased. Moreover, compared with the case where a masking tape is used, working time can be shortened significantly and cost can be reduced.

  In addition, since an upper interval Y1 and a lower interval Y2 are provided between the jig end surface 37 of the rising portion 38 and the first vertical wall surface 26 of the stepped portion 7, a gap between the first vertical wall surface 26 and the jig end surface 37 is provided. It is possible to suppress the continuous formation of the dark color coating film 12 and to suppress the deterioration of the appearance quality of the resin molded product 3.

  In addition, since the lower interval Y2 is set narrower than the upper interval Y1 between the rising portion 38 and the first vertical wall surface 26, the dark color is formed from the upper interval Y1 to between the first vertical wall surface 26 and the jig end surface 37. Even if the paint 8 flows in, it is possible to suppress the inflow of the dark paint 8 further below the lower interval Y2.

  Further, by providing the masking jig 2 with the reverse projecting portion 40 projecting toward the mask region S2, the outer surface of the masking jig 2 is located below the reverse projecting portion 40 when the dark paint 8 is applied. The coating films 48 and 49 formed in the above become discontinuous. Thereby, when the coating films 48 and 49 are formed on the masking jig 2, only the coating film 48 formed on the outer surfaces of the overhanging portion 39 and the reverse overhanging portion 40 can be easily cleaned. The working efficiency for can be improved.

  In addition, since the jig-side convex portion 30 that fits into the positioning concave portion 24 formed in the mold 20 is provided in the masking jig 2, the masking jig 2 is positioned with respect to the mold 20 with high accuracy. it can. Thereby, the shift | offset | difference of the masking jig | tool 2 with respect to the mold 20 is reduced, mask area | region S2 can be masked correctly, and the external appearance of a resin molded product can be improved.

  Further, since the guide hole 31 through which the guide rod 25 formed in the mold 20 is inserted is provided in the masking jig 2, the masking jig 2 is not brought into contact with a portion that should not contact the mold 20. The guide rod 25 can lead to an accurate position.

Second Embodiment
FIG. 16 is a perspective view showing a part of the molding apparatus in the second embodiment, FIG. 17 is a perspective view showing a comparison with the molding apparatus in the second embodiment, and FIG. 18 is a molding apparatus in the second embodiment. It is a perspective view which shows the other contrast with. FIGS. 16-18 shows (A) before the masking jig is installed, and (B) shows after the masking jig is installed. In addition, about the site | part which has the same function, the same code | symbol is attached | subjected and in order to avoid duplication, description is abbreviate | omitted.

  As shown in FIG. 16, in the molding apparatus 70 according to the second embodiment, a height portion 72 that is higher than the upper surface 28 of the convex portion 4 is formed in the mold 71 continuously with the convex portion 4. The height portion 72 has a third vertical wall surface 73 that is continuous with the second vertical wall surface 27 of the convex portion 4, and a connecting wall surface 74 that is connected to the convex portion 4. By forming such a high portion 72, a difference in height occurs between the convex portion 4 and the high portion 72 on the boundary line formed between the coating region S1 and the mask region S2. In the portion where the height difference occurs, a part of the third vertical wall surface 73 of the height portion 72 is cut out, and an inclined portion 75 inclined so as to gradually become higher from the convex portion 4 side toward the height portion 72 side. It is formed. Therefore, the connecting wall surface 74 and the inclined portion 75 are formed on the molding surface 76 at different angles. Corresponding to the inclined portion 75, also in the masking jig 77, an inclined mask portion 78 having a constant interval Z <b> 1 between the inclined portion 75 and the overhanging portion 39 continues to the end portion of the masking jig 77. Is formed. The interval Z1 substantially coincides with the interval X formed between the protruding portion 39 of the masking jig 77 and the upper surface 28 of the mold 71.

  Here, in the comparison shown in FIG. 17, the inclined portion is not formed at the portion where the height difference occurs in the boundary line, and the molding surface 76 of the mold 71 is interposed between the masking jig 80 and the connecting wall surface 74. A substantially vertical interval Z2 is formed. Such an interval Z2 is formed wider than the interval X formed between the overhanging portion 39 of the masking jig 80 and the upper surface 28 of the mold 71. Therefore, when applying the dark paint 8, the dark paint 8 flows from the interval Z <b> 2, and the dark paint 8 may adhere to the connection wall surface 74 of the high portion 72.

  Therefore, in another contrast shown in FIG. 18, a protruding portion 79 that protrudes toward the protruding portion 4 and is connected to the protruding portion is formed on the connecting wall surface 74 of the high portion 72. By forming such a protruding portion 79, it is possible to suppress the inflow of the dark paint 8 from between the masking jig 90 and the height portion 72 to the connecting wall surface 74, but the protruding portion 79 having a protruding shape is provided. Since the concave shape corresponding to is formed in the resin molded product, a gap is generated in the molded resin molded product.

  On the other hand, according to the second embodiment shown in FIG. 16, the inclined portion 75 is formed in the high portion 72, and the inclined mask portion 78 that covers the inclined portion 75 is formed in the masking jig 77. It is possible to suppress the inflow of the dark paint 8 into the connection wall surface 74 at the same interval Z1. Furthermore, since the connecting wall surface 74 and the inclined portion 75 are formed on the molding surface 76 at different angles, and the connecting wall surface 74 is not formed as a surface continuous with the inclined portion 75, the dark paint 8 Even if inflow, inflow to the connecting wall surface 74 is further reduced. Therefore, the dark paint 8 can be prevented from adhering to the connection wall surface 74 of the high portion 72.

  In addition, since the inclined portion 75 formed in the mold 71 is not formed by the protruding portion 79 as in another comparative example (see FIG. 18), no gap is generated in the resin molded product 3, and the appearance quality is deteriorated. It can be suppressed.

<Third Embodiment>
FIG. 19 is a cross-sectional view showing a part of the molding apparatus according to the third embodiment. In addition, about the site | part which has the same function as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted in order to avoid duplication.

  The molding apparatus 100 according to the third embodiment is different from the first embodiment in that the object to be masked is not the mold but the product 101. The form of the masking jig 2 is the same as that of the first embodiment. The material of the product to be masked is not limited to resin, and can be applied to products of various materials.

  A stepped portion 102 is formed on the outer surface of the product 101, and a height surface 103 (corresponding to the upper surface) having a high height on one side across the stepped portion 102 is the application region S1, and the stepped portion The lower surface 104 having a low height on the other side across the surface 102 and the vertical wall surface 105 which is the wall surface of the stepped portion 102 are the mask region S2. Accordingly, the stepped portion 102 falls from the high surface 103 (upper surface) formed adjacent to the mask region S2 on the surface on the coating region S1 side between the coating region S1 and the mask region S2, and the mask region side The vertical wall surface 105 is formed. By using the same masking jig 2 as in the first embodiment for such a product 101, the mask area S2 is masked and applied in the same manner as when the dark paint 8 is applied in the first embodiment. The paint 108 can be applied to the region S1.

  According to the third embodiment, the product 101 can be masked using the same masking jig 2 as in the first embodiment even if the object of masking is not the mold but the product 101. Since other effects are the same as those of the first embodiment, description thereof is omitted.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, the colors of the dark paint 8 and the light paint 9 are not particularly limited and can be selected as appropriate. In addition, the darkness and darkness of the dark paint 8 and the light paint 9 are not particularly limited as long as the color of the other paint is lighter than that of the other paint.

  In addition, the paints 8 and 9 and the resin material 34 are not limited to urethane materials, and for example, materials made of thermoplastic and thermosetting resins can be used.

  Further, the step portion formed at the boundary between the coating region S1 and the mask region S2 is provided on the convex portion 4 provided with the paired vertical wall surfaces 26 and 27 as in the first and second embodiments. However, it can be formed as the stepped portion 102 formed by one vertical wall surface 105 and the high surface 103 (upper surface) as in the third embodiment, but is not limited to such a form. That is, if the vertical wall surface that falls from the upper surface and the upper surface is provided, the masking jig according to the present invention can be arranged, so that, for example, a cut portion can be provided in the concave shape (groove shape).

1,70,100 molding equipment,
2, 50, 77, 80, 90 Masking jig,
3 resin molded products,
5 resin molds,
7,102 steps,
8 Dark paint (paint),
10 molding surface,
20,71 mold type,
21,76 molding surface,
22 core type,
24 positioning recess,
25 Guide rod,
26 first vertical wall surface,
27 Second vertical wall surface,
28 upper surface,
30 Jig side convex part,
31 guide hole,
37, 52 Jig end face,
38,51 Rise,
39 Overhang,
40 Reverse overhang,
101 products,
103 Altitude surface (upper surface),
104 Low side,
105 vertical wall,
108 paint,
S1 application area,
S2 mask area,
X interval,
Y1 upward spacing,
Y2 Downward spacing.

Claims (5)

A masking method in which a coating area where a paint is applied and a mask area where a paint is not applied are separated by a masking jig when applying the paint on a mold or a product,
For a mold or product in which a stepped portion that has dropped from the application region toward the mask region is formed near the boundary between the application region and the mask region ,
A flat portion covering the mask region, projecting the rising portion facing the vertical wall surface of projecting the stepped portion from the flat portion, from said rising portion so as to cover at a distance the coated surface of the coating region into the coating region A projecting part and a reverse projecting part projecting from the rising part to the mask region side, wherein a discontinuous part is formed between the coating film formed on the projecting part and the coating film formed on the flat part. A masking method in which a coating jig is applied by installing a masking jig on which a reverse overhanging portion is formed near the boundary region of the mold or product . Masking method according to claim 1, the rising portion is placed at a vertical wall surface and spacing of the stepped portion. The distance between the vertical wall surface of the stepped portion and the rising portion than said coated surface side of the vertical wall surface, masking method according to claim 2 which sets a narrow Oite the drop direction of the vertical wall surface. The masking jig is positioned by fitting the jig-side convex part or jig-side concave part formed on the masking jig to the positioning concave part or positioning convex part formed on the mold or product. The masking method of any one of Claims 1-3. The rod-shaped guide rod formed in the said metal mold | die or a product is inserted in the guide hole formed in the said masking jig, and a masking jig is guide | induced to the said metal mold | die or a product. A masking method described in 1.

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