JP7614644B2 - Paint masking method and paint masking member - Google Patents

Description

The present invention relates to a masking method for masking non-painted portions of a metal workpiece and a masking member for masking non-painted portions of the metal workpiece.

Conventionally, various methods and materials have been proposed for masking parts (non-painted parts) that must not be painted due to performance, design, and other requirements when painting a workpiece (object to be painted). The most common masking method is, for example, a method in which masking tape is applied to the non-painted parts to mask them. However, masking methods using masking tape are very time-consuming because the masking tape must be applied to the non-painted parts every time painting is performed and then peeled off after painting. In addition, there is a problem that a large amount of waste is generated because the masking tape cannot be reused. Furthermore, when applying masking tape manually, unavoidable variations occur for each worker and workpiece, which also poses problems in terms of standardization (homogenization) of work and quality.

Under these circumstances, Patent Document 1 (Japanese Utility Model Application Laid-Open Publication No. 7-037359) discloses a masking member that is composed of a base plate and plate-shaped magnets attached to the outer periphery of the four sides of the top surface of the base plate, in order to facilitate the attachment and removal of the masking member to and from the object to be coated. In this document, it is said that by fixing the masking member to a desired location using the magnetic force of the plate-shaped magnets, it is possible to prevent the non-painted parts covered by the base plate from being painted, and that the attachment and removal of the masking member becomes significantly easier.

Japanese Utility Model Application Publication No. 7-037359

However, in the masking member disclosed in Patent Document 1, the plate-shaped magnet and the workpiece around the non-painted area (the part of the object to be painted that is not the non-painted part) are fixed by magnetic force while facing each other, and the infiltration of paint is prevented at the fixed part, but there is a risk that paint sprayed directly onto the fixed part will enter the non-painted part. In addition, the plate-shaped magnet is fixed to the substrate with an adhesive (paragraph 0010 of Patent Document 1), but the adhesive may dissolve due to components contained in the paint, reducing the quality of the paint and damaging the masking member. Furthermore, a convex magnet is provided in addition to the plate-shaped magnet to position the masking member, but this increases the number of parts and increases costs.

The present invention has been made in consideration of these points, and provides a painting masking method and a painting masking member for masking unpainted portions of a metal workpiece , which have a simple configuration and are effective in standardizing work.

That is, the first invention relates to a masking method for masking an unpainted portion of a metal workpiece, comprising the steps of: forming a masking panel portion having a masking shape portion having a shape corresponding to the unpainted portion and an extension portion extending a predetermined width from the outer edge of the masking shape portion; drilling a through hole in the masking shape portion of the masking panel portion; forming an edge wall portion that can be arranged on the extension portion ; fixing a permanent magnet to the through hole of the masking panel portion and attaching the edge wall portion to the extension portion of the masking panel portion to obtain a masking member; covering the unpainted portion with the masking shape portion and fixing the masking member to the metal workpiece by the magnetic force of the permanent magnet with the edge wall portion arranged outside the outer edge of the unpainted portion; and spraying paint onto the metal workpiece to which the masking member is fixed.

The second invention relates to a method of masking for painting according to the first invention, in which the through hole is a circular hole, the permanent magnet is cylindrical, and the inner diameter of the through hole is smaller than the outer diameter of the permanent magnet, and the permanent magnet is press-fitted into the through hole of the masking panel portion to fix the permanent magnet to the through hole.

The third invention relates to a method of masking for painting according to the first invention, in which the through hole is a circular hole, the permanent magnet is cylindrical, and the inner diameter of the through hole is equal to or smaller than the outer diameter of the permanent magnet, and the permanent magnet is inserted or pressed into the through hole, and the periphery of the through hole is plastically deformed to fix the permanent magnet to the through hole of the masking panel by crimping.

A fourth invention relates to a masking member for painting that masks non-painted portions of a metal workpiece, comprising: a masking panel portion having a masking shape portion having a shape corresponding to the non-painted portion and an extension portion extending a predetermined width from the outer edge of the masking shape portion; a permanent magnet fixed to a through hole formed in the masking shape portion of the masking panel portion; and an edge wall portion that can be arranged on the extension portion of the masking panel portion.

The fifth invention relates to a masking member for painting according to the fourth invention, in which the edge wall portion protrudes toward the metal workpiece side beyond the masking face plate portion and surrounds the outer edge of the non-painted portion, and the extension portion has an edge wall portion attachment portion to which the edge wall portion is attached, and an offset portion formed between the outer edge of the non-painted portion and the edge wall portion attachment portion.

According to a first aspect of the present invention, there is provided a method for masking non-painted portions of a metal workpiece, the method comprising the steps of: forming a masking panel portion having a masking shape portion having a shape corresponding to the non-painted portion and an extension portion extending from an outer edge of the masking shape portion by a predetermined width; drilling a through hole in the masking shape portion of the masking panel portion; forming an edge wall portion that can be disposed on the extension portion ; fixing a permanent magnet to the through hole of the masking panel portion and attaching the edge wall portion to the extension portion of the masking panel portion to obtain a masking member; covering the non-painted portion with the masking shape portion and fixing the masking member to the metal workpiece by the magnetic force of the permanent magnet in a state in which the edge wall portion is disposed outside the outer edge of the non-painted portion; and spraying paint onto the metal workpiece to which the masking member is fixed. Therefore, a masking member for painting having a simple configuration can be obtained, and the painting operation can be standardized using the masking member.

According to the second invention, the masking method for painting is the same as that of the first invention, except that the through hole is a circular hole and the permanent magnet is cylindrical, and furthermore, the inner diameter of the through hole is smaller than the outer diameter of the permanent magnet. The permanent magnet is press-fitted into the through hole of the masking panel, thereby allowing the permanent magnet to be fixed to the through hole of the masking panel without using adhesive, and preventing deterioration of the painting quality and damage to the masking member due to elution of the adhesive.

According to the third invention, in the first invention, the through hole is a circular hole, the permanent magnet is cylindrical, and the inner diameter of the through hole is equal to or smaller than the outer diameter of the permanent magnet. The permanent magnet is inserted or pressed into the through hole, and the periphery of the through hole is plastically deformed to fix the permanent magnet to the through hole of the masking panel by crimping. This allows the permanent magnet to be firmly fixed to the through hole of the masking panel without using adhesive, and further prevents deterioration of the painting quality and damage to the masking member due to elution of the adhesive.

According to a fourth aspect of the present invention, there is provided a masking member for masking a non-painted portion of a metal workpiece, the masking member comprising: a masking surface plate portion made of a plate material having a masking shape portion having a shape corresponding to the non-painted portion and an extension portion extending by a predetermined width from an outer edge of the masking shape portion;
Since the masking member is provided with a permanent magnet fixed to a through hole formed in the masking shape portion of the masking panel portion, and an edge wall portion that can be arranged on the extension portion of the masking panel portion, a masking member for painting having a simple configuration can be obtained, and the masking member can be used to standardize painting operations.

According to the fifth invention, the masking method for painting according to the fourth invention, the edge wall portion protrudes toward the metal workpiece side more than the masking panel portion and surrounds the outer edge of the non-painted portion, and the extension portion has an edge wall portion attachment portion to which the edge wall portion is attached and an offset portion formed between the outer edge of the non-painted portion and the edge wall portion attachment portion, so that the intrusion of paint into the non-painted portion can be further suppressed.

FIG. 1 is a plan view of a masking member obtained in a masking method for painting according to one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a plan view of a masking face plate portion formed in a masking method for paint according to one embodiment of the present invention. FIG. 4 is a plan view of an edge wall formed in a paint masking method according to one embodiment of the present invention. FIG. 5 is a bottom view of the masking member shown in FIG. FIG. 6 is a plan view of a metal workpiece used in a masking method for painting according to one embodiment of the present invention. FIG. 7 is a side view of the metal workpiece shown in FIG. FIG. 8 is a plan view showing a state in which a masking member is fixed to a metal workpiece in a paint masking method according to one embodiment of the present invention. FIG. 9 is a side view of FIG. FIG. 10 is a cross-sectional view taken along line BB of FIG. FIG. 11 is an enlarged view of part C in FIG.

The masking member for painting according to the present invention will be described with reference to the embodiment shown in the drawings.
The masking method for painting of the present invention shown in Figures 1 to 11 is a method for masking a non-painted portion 31 of a metal workpiece 3 (an object to be painted), and includes the steps of forming a masking surface plate portion 11 from a plate material , the masking surface plate portion 11 having a masking shape portion 14 having a shape corresponding to the non-painted portion 31 and an extension portion 15 extending by a predetermined width from the outer edge of the masking shape portion 14, drilling a through hole 16 in the masking shape portion 14 of the masking surface plate portion 11, and forming an edge wall portion 12 that can be disposed outside the outer edge of the non-painted portion 31. the step of forming a masking member 1; the step of fixing a permanent magnet 13 to the through hole 16 of the masking panel portion 11 and attaching an edge wall portion 12 to the extension portion 15 of the masking panel portion 11 to obtain a masking member 1; the step of fixing the masking member 1 to a metal workpiece 3 by the magnetic force of the permanent magnet 13 with the masking shape portion 14 covering the non-painted portion 31 and the edge wall portion 12 disposed outside the outer edge of the non-painted portion 31; and the step of spraying paint onto the metal workpiece 3 to which the masking member 1 is fixed.

In the embodiment, a non-magnetic metal plate is used as the plate material forming the masking panel portion 11. As a result, as described below, the masking panel portion 11 is less susceptible to the magnetic force of the permanent magnets 13 fixed to the through holes 16 of the masking panel portion 11, and therefore the fixation (retention) of the permanent magnets 13 by the masking panel portion 11 is less likely to be adversely affected. A stainless steel plate is preferable as the plate material forming the masking panel portion 11. Stainless steel plates have the advantage of being less prone to deformation and corrosion by paint. The thickness of the plate material forming the masking panel portion 11, i.e., the thickness of the masking panel portion 11 (t1 shown in FIG. 11), is preferably 1 to 3 mm. In this embodiment, the thickness: t1 of the masking panel portion 11 is 1 mm, and the masking panel portion 11 is formed from a stainless steel plate having a plate thickness of 1 mm.

The shape of the masking panel portion 11 is determined by the masking shape portion 14, which has a shape corresponding to the non-painted portion 31, and the extension portion 15, which extends from the outer edge of the masking shape portion 14 by a predetermined width. In this embodiment, the masking shape portion 14 is a flat plate having an outer shape substantially identical to that of the non-painted portion 31. The extension portion 15 is determined taking into consideration the width of the edge wall portion 12 (W shown in FIG. 11) described below. In other words, the width of the extension portion 15 is equal to or greater than the width W of the edge wall portion 12, and is preferably 1 to 2 mm larger than the width W of the edge wall portion 12. As a result, the outer edge side portion of the extension portion 15 becomes the edge wall portion attachment portion 17, and its inner portion (from the inner edge of the edge wall portion attachment portion 17 to the outer edge of the masking shape portion 14) becomes the offset portion 18.

The width of the offset portion 18 (d shown in FIG. 11) is preferably 1 to 2 mm. If the width: d of the offset portion 18 is too small, workability may be impaired, for example, it may become difficult to place the masking member 1 (masking shape portion 11) on the non-painted portion 31. On the other hand, if the width is too large, interference with other materials or workers may occur, yield may decrease, or too much paint may get into the offset portion 18 (space 41 described later), adversely affecting masking properties.

In this embodiment, as shown in FIG. 11, the outer edge of the extension 15 and the outer edge of the edge wall 12 are approximately aligned, and the width of the extension 15 is 3 mm, which is approximately the same as the sum of the width W of the edge wall 12 and the width d of the offset 18. That is, as described below, in this embodiment, the width W of the edge wall 12 is 2 mm, and the width d of the offset 18 is 1 mm.

The masking panel portion 11 as shown in FIG. 3 is formed by cutting the stainless steel plate by laser processing or press processing along the outer shape of the masking panel portion 11 determined as described above.

Through holes 16 are drilled in the masking shape portion 14 of the masking face plate portion 11. In this embodiment, the through holes 16 are circular holes, and the inner diameter thereof is formed to be slightly smaller than the outer diameter of the permanent magnet 13 described later. As shown in FIG. 3, the through holes 16 are preferably drilled in the approximate center portion of the masking face plate portion 11 (masking shape portion 14), in other words, in a portion spaced a certain distance from the entire outer peripheral edge portion of the masking face plate portion 11. Although the through holes 16 can be drilled in a separate process after the masking face plate portion 11 is formed, in this embodiment, the through holes 16 are drilled simultaneously with the above-mentioned masking face plate portion 11 formation process (at the time of laser processing or press processing for cutting the masking face plate portion 11 from the stainless steel plate), thereby obtaining the masking face plate portion 11 with the through holes 16 drilled therein as shown in FIG. 3.

The edge wall portion 12 is preferably made of a non-magnetic metal material. This makes it less susceptible to the magnetic force of the permanent magnet 13 fixed to the through hole 16 of the masking panel portion 11. Stainless steel is a preferable non-magnetic metal material constituting the edge wall portion 12, and in particular, the edge wall portion 12 is preferably formed from a stainless steel plate. Stainless steel plate has the advantage of being difficult to deform and difficult to corrode by paint, and is suitable for repeated use. The plate thickness of the plate material forming the edge wall portion 12, i.e., the thickness of the edge wall portion 12 (t2 shown in FIG. 11), is preferably 1 to 3 mm. In this embodiment, the edge wall portion 12 is formed from the same stainless steel plate as the masking panel portion 11 described above, and its thickness: t2 is 1 mm.

The edge wall portion 12 is shaped so that it can be disposed outside the outer edge of the non-painted portion 31. In other words, the edge wall portion 12 is shaped so that it can surround the outer edge portion 33 of the non-painted portion 31. In other words, the edge wall portion 12 is shaped so that it can engage with the outer periphery (outer edge portion 33) of the non-painted portion 31. In this embodiment, as shown in Figs. 4 and 5, the edge wall portion 12 has an outer edge that approximately coincides with the outer edge of the masking panel portion 11 and is shaped like an annular plate having a certain width: W (here, 2 mm). In this embodiment, as shown in Fig. 4, a part of the edge wall portion 12 is missing from the outer edge of the masking panel portion 11. The edge wall portion 12 can be formed separately from the masking panel portion 11, but in this embodiment, the edge wall portion 12 as shown in Fig. 4 is formed by cutting it out of the same stainless steel plate as the masking panel portion 11 by laser processing or press processing.

A permanent magnet 13 is fixed to the through hole 16 of the masking panel portion 11. In this embodiment, the permanent magnet 13 is cylindrical, and as described above, the inner diameter of the through hole 16 is formed smaller than the outer diameter of the permanent magnet 13. In other words, the outer diameter of the permanent magnet 13 is formed larger than the inner diameter of the through hole 16. The size of the permanent magnet 13 is not particularly limited, but it is preferable to use one with an outer diameter of about 5 to 6 mm and a height (dimension in the vertical direction in FIG. 2) of about 2 to 4 mm. The permanent magnet 13 is fixed to the through hole 16 of the masking panel portion 11 by pressing the permanent magnet 13 into the through hole 16. At this time, it is preferable that the lower surface of the masking panel portion 11 (the lower surface in FIG. 2, the surface facing the non-painted portion 31) and the lower surface of the permanent magnet 13 (the lower surface in FIG. 2, the surface facing the non-painted portion 31) are flush with each other. The permanent magnet 13 can be pressed into the through hole 16 stably if the thickness t1 of the masking face plate portion 11 is 2 mm or more.

Furthermore, in this embodiment, the plate thickness: t1 of the masking plate portion 11 is relatively thin at 1 mm. Therefore, it is preferable to crimp the permanent magnet 13 to the through hole 16 of the masking plate portion 11 by plastically deforming the peripheral portion of the through hole 16 while the permanent magnet 13 is pressed into the through hole 16. The crimping is performed, for example, as shown in FIG. 5, by using a punch to strike the peripheral portion of the through hole 16 (here, three striking portions 19) to plastically deform a part of the peripheral portion toward the inside of the through hole 16 (in the direction of reducing the inner diameter of the through hole 16), thereby firmly fixing (holding) the permanent magnet 13 to the through hole 16. It is preferable to perform such crimping when the thickness: t1 of the masking plate portion 11 (the plate thickness of the stainless steel plate forming the masking plate portion 11) is thin (for example, about 1 mm).

The inner diameter of the through hole may be the same as the outer diameter of the permanent magnet, but in that case, it is preferable to insert the permanent magnet into the through hole and then plastically deform the periphery of the through hole to crimp the permanent magnet into the through hole of the masking panel. As described above, it is preferable to fix the permanent magnet 13 to the through hole 16 (fixed by press fitting or crimping) without using adhesive, which can prevent deterioration of the paint quality and damage to the masking member 1 due to elution of the adhesive.

The edge wall 12 is attached to the extension 15 (edge wall attachment 17) of the masking panel 11. In this embodiment, as shown in FIG. 5, the masking panel 11 and the edge wall 12 are spot welded to each other at multiple locations (10 spot welds 20 in this example) along the portion where they face each other (outer edge portion), so that the edge wall 12 is attached to the extension 15 (edge wall attachment 17) of the masking panel 11. By attaching the edge wall 12 to the outer edge of the masking panel 11, the strength (rigidity) of the masking member 1, which will be described later, can be improved. Note that it is preferable not to use adhesive when attaching the edge wall 12 to the masking panel 11, and this can prevent deterioration of the paint quality and damage to the masking member 1 due to the elution of the adhesive.

As described above, the masking member 1 is obtained by fastening the permanent magnet 13 to the through hole 16 of the masking face plate portion 11 and attaching the edge wall portion 12 to the extension portion 15 (edge wall portion attachment portion 17) of the masking face plate portion 11. In this embodiment, since a portion of the edge wall portion 12 is missing as described above, the edge wall portion missing portion 21 is provided in the masking member 1. As a result, as shown in Figures 8 and 9, for example, when the masking member 1 is fixed to the metal workpiece 3, it is formed so as to correspond to a step shape (step portion 34) that continues to the non-painted portion 31.

Then, the masking member 1 obtained is fixed to the metal workpiece 3. Here, the metal workpiece 3 is made of a magnetic metal (e.g., iron, etc.), and an example of such a workpiece is the brake caliper of an automobile. Since the brake caliper is visible from the outside through the wheel, the exterior is generally painted to improve its design. However, since the brake caliper is a part that controls the operation of the brake pads and is an extremely important part related to the braking operation of the automobile, it is necessary to strictly manage the paint quality (painted areas) so that the paint does not affect the performance of the brake system.

Specifically, as shown in Figures 8 to 11, the masking shape portion 14 of the masking member 1 covers the non-painted portion 31 of the metal workpiece (brake caliper) 3, and the edge wall portion 12 is disposed outside the outer edge of the non-painted portion 31. The masking member 1 is then fixed to the metal workpiece 3 by the magnetic force of the permanent magnet 13.

In this embodiment, as shown in Figs. 9 to 11, with the masking member 1 fixed to the metal workpiece 3, the edge wall portion 12 is disposed outside the outer edge of the non-painted portion 31. The edge wall portion 12 protrudes toward the metal workpiece 3 from the masking panel portion 11. Specifically, it protrudes toward the metal workpiece 3 from the surface (lower surface) of the masking panel portion 11 facing the non-painted portion 31. As a result, the edge wall portion 12 surrounds the outer edge portion 33 of the non-painted portion 31, so that the opposing portion (outer edge portion 33) between the masking shape portion 14 (lower surface) and the non-painted portion 31 (upper surface) is not directly exposed when viewed from the side.

In addition, the edge wall portion 12 can be attached to the outer periphery (outer edge portion 33) of the non-painted portion 31. That is, when the masking member 1 is fixed to the metal workpiece 3, if the masking member 1 is not placed accurately on the metal workpiece 3, for example, if the edge wall portion 12 rides up on the non-painted portion 31, an abnormality can be detected by the inclination of the masking member 1. In addition, when the masking member 1 is accurately fixed and attached to the metal workpiece 3, even if the masking member 1 is moved along the non-painted portion 31, the outer periphery (outer edge portion 33) of the non-painted portion 31 and the edge wall portion 12 come into contact with each other, and the movement of the masking member 1 is suppressed. Furthermore, the masking member 1 is attracted to the metal workpiece 3 by the magnetic force of the permanent magnet 13. This allows the masking member 1 to be accurately fixed to the metal workpiece 3, and prevents the masking member 1 from shifting after it is fixed to the metal workpiece 3, which contributes to the standardization of work.

In addition, in this embodiment, the through hole 16 is drilled in the approximate center of the masking panel portion 11 (masking shape portion 14), in other words, in a portion spaced a certain distance from the entire outer peripheral edge of the masking panel portion 11, so that the magnetic force of the permanent magnet 13 (the force that attracts the masking member 1 and the metal workpiece 3) is generated only between the approximate center of the masking member 1 (masking panel portion 11) and the approximate center of the non-painted portion 31. This makes it easier to accurately fix the masking member 1 to the metal workpiece 3 and also makes it easier to remove the masking member 1 from the metal workpiece 3 after painting.

As described above, in this embodiment, the masking member 1 is provided with an edge wall missing portion 21. As shown in Figures 8 and 9, the outer edge of the edge wall missing portion 21 is abutted against a step portion 34 that is continuous with the non-painted portion 31 of the metal workpiece 3, so that the entire non-painted portion 31 can be covered.

As described above, the extension 15 has an edge wall attachment portion 17 to which the edge wall 12 is attached, and an offset portion 18 formed between the outer edge 33 of the non-painted portion 31 and the edge wall attachment portion 17 (the inner edge of the edge wall 12). As a result, a space 41 is formed between the metal workpiece 3, the offset portion 18, and the edge wall 12, as shown in FIG. 11.

Then, paint is sprayed onto the metal workpiece 3 to which the masking member 1 is fixed. Any known method can be used for spray painting, such as a method in which the paint is atomized and sprayed together with high-pressure air, or a method in which the paint is pressurized and sprayed using that pressure without using high-pressure air (so-called airless spray). In addition, known resin paints, etc. can be used as the paint.

At this time, as shown in FIG. 11, the edge wall 12 surrounds the outer edge 33 of the non-painted portion 31. This prevents paint from being sprayed directly from the side onto the opposing portion (outer edge 33) between the masking shape portion 14 (the lower surface) and the non-painted portion 31 (the upper surface), preventing paint from entering the non-painted portion 31.

As shown in FIG. 11, a space 41 is formed between the metal workpiece 3, the offset portion 18, and the edge wall portion 12. Therefore, as described above, the edge wall portion 12 prevents the paint from entering the non-painted portion 31, while the paint that has gently entered the space 41 paints the metal workpiece 3. This allows the side wall portion of the metal workpiece 3 that is not the non-painted portion to be painted, but the paint on that painted portion is thinner than the other portions of the metal workpiece 3 (the painted portion 32 that is not affected by the masking member 1).

The paint masking method having the above-mentioned steps has a simple structure and is effective in standardizing work. In particular, in recent years, there has been a call for the achievement of the SDGs, and there is a strong demand for standardization (homogenization) of work and quality even at painting sites. The paint masking method of the present invention not only eliminates the need to check masked areas by preparing dedicated masking members for each non-painted part of the metal workpiece, but also standardizes the painting work by the number and shape of each masking member, allowing a variety of workers (healthy people, disabled people, etc.) to perform the work accurately. In other words, it can also contribute to improving overall labor productivity, including the painting process.

By repeating painting, paint will adhere to and accumulate on the masking member 1, but in the masking member 1, the adhered and accumulated paint can be removed using an organic solvent or the like. In other words, in the masking member 1, no adhesive is used when fixing the permanent magnet 13 to the masking panel portion 11 or when attaching the edge wall portion 1. Therefore, deterioration of the painting quality due to elution of the adhesive and damage to the masking member 1 due to this (falling off of the permanent magnet 13 or edge wall portion 12) do not occur. Therefore, since the masking member 1 can be used repeatedly, unlike disposable masking tape, it is possible to reduce the environmental burden.

As shown in Figures 1 and 2 and Figures 10 and 11, the masking member 1 for painting of the present invention is a masking member 1 for masking a non-painted portion 31 of a metal workpiece 3 (object to be painted), and comprises a masking panel portion 11 made of a plate material (stainless steel plate) having a masking shape portion 14 having a shape corresponding to the non-painted portion 31 and an extension portion 15 extending a predetermined width from the outer edge of the masking shape portion 14, a permanent magnet 13 fixed to a through hole 16 formed in the masking shape portion 14 of the masking panel portion 11, and an edge wall portion 12 made of a metal material (stainless steel) that is attached to the extension portion 15 of the masking panel portion 11 and can be arranged outside the outer edge of the non-painted portion 31 (in other words, capable of surrounding the outer edge portion 33, in other words, capable of being engaged with the outer edge portion 33).

The extension 15 and edge wall 12 also function as gripping parts when removing the masking member 1 from the metal workpiece 3. The masking member may be provided with gripping pieces that protrude outward, either separately or integrally with the masking face plate. This makes it easier to remove the masking member from the metal workpiece.

In the above embodiment, the non-painted portion 31 is flat, but it may be an uneven surface. In this case, it is preferable to form the masking shape portion 14 into an appropriate shape by bending or the like, and to provide an edge wall missing portion 21 appropriately so that the entire non-painted portion is covered by the masking member. Since the masking shape portion of the masking member is shaped to correspond to the non-painted portion, a dedicated masking member is prepared for each non-painted portion, which makes it easier for the worker to grasp the non-painted portion and allows the masking work to be performed accurately and reliably.

More than one permanent magnet may be attached. In particular, if the unpainted area is large or has an uneven surface, it is desirable to place more than one permanent magnet in appropriate locations.

The paint masking method and paint masking member of the present invention can, in particular, standardize painting work, improve work efficiency, increase the number of workers, and contribute to reducing the environmental burden.

Reference Signs List 1 Masking member 11 Masking face plate portion 12 Edge wall portion 13 Permanent magnet 14 Masking shape portion 15 Extension portion 16 Through hole 17 Edge wall portion attachment portion 18 Offset portion 19 Hammering portion 20 Spot welded portion 21 Edge wall portion missing portion 3 Metal workpiece 31 Non-painted portion 32 Painted portion 33 Outer edge portion 34 Step portion 41 Space

Claims (5)

A painting masking method for masking an unpainted portion of a metal workpiece, comprising:
forming a masking panel having a masking shape portion having a shape corresponding to the non-painted portion and an extension portion extending from an outer edge of the masking shape portion by a predetermined width;
drilling a through hole in the masking shape portion of the masking face plate portion;
forming an edge wall portion disposable on the extension ;
a step of attaching a permanent magnet to the through hole of the masking face plate portion and attaching the edge wall portion to the extension portion of the masking face plate portion to obtain a masking member;
a step of fixing the masking member to the metal workpiece by the magnetic force of the permanent magnet while covering the non-painted portion with the masking shape portion and disposing the edge wall portion outside the outer edge of the non-painted portion;
a step of spraying paint onto the metal workpiece to which the masking member is fixed;
A method for masking for painting, comprising the steps of: The method for masking for painting according to claim 1, further comprising a step of fastening the permanent magnet to the through hole of the masking panel by press-fitting the permanent magnet into the through hole, the through hole being a circular hole and the permanent magnet being cylindrical, and the inner diameter of the through hole being smaller than the outer diameter of the permanent magnet. The method for masking for painting according to claim 1, wherein the through hole is a circular hole, the permanent magnet is cylindrical, and the inner diameter of the through hole is equal to or smaller than the outer diameter of the permanent magnet, and the permanent magnet is inserted or pressed into the through hole, and the periphery of the through hole is plastically deformed to fix the permanent magnet to the through hole of the masking panel by crimping. A masking member for painting that masks an unpainted portion of a metal workpiece,
a masking surface plate portion made of a plate material having a masking shape portion having a shape corresponding to the non-painted portion and an extension portion extending from an outer edge of the masking shape portion by a predetermined width;
a permanent magnet fixed to a through hole formed in the masking shape portion of the masking surface plate portion;
an edge wall portion disposable on the extension of the masking face plate;
A masking member for painting, comprising: The masking member for painting according to claim 4, wherein the edge wall portion protrudes toward the metal workpiece side beyond the masking face plate portion and surrounds the outer edge of the non-painted portion, and the extension portion has an edge wall portion attachment portion to which the edge wall portion is attached, and an offset portion formed between the outer edge of the non-painted portion and the edge wall portion attachment portion.

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