JP2021075106A - Vehicular wheel and logo part formation method of vehicular wheel - Google Patents

Abstract

To provide a vehicular wheel in which there is no high convex portion in a corner part of an engraving processed surface of a logo part and a clear coating film having a sufficient film thickness can be formed, and a logo part formation method of the vehicular wheel.SOLUTION: A vehicular wheel 1 comprises: a coating part 5 in which coating in a base color is applied to a wheel body 10; and a logo part 6 which is made of a character, a graphic, a symbol or the like formed by exposing a metal surface by cutting coating films 41, 42 and base material metal of the wheel body 10 with machine work on a portion of the coating part 5. The logo part 6 comprises: an engraving processed surface 61 being a metal surface engraving-processed by a cutting tool; and a clear coating film 43 which is formed on the engraving processed surface 61. The engraving processed surface 61 includes a convex removal processing trace structure 63 being a low portion in which a high convex portion 62 having a certain height or higher that is formed as an uncut portion on a processing trace of the cutting tool which traces a line shape of a logo design shape is removed in a specific corner part 7 of the logo design shape of the logo part 6.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle wheel on which a logo portion is formed and a method for forming a logo portion of the vehicle wheel.

It is known that the design surface of a vehicle wheel has a logo part consisting of letters, figures, symbols, etc., and this logo part symbolizes the manufacturer name, brand name, etc., and is also an accent element of the wheel design. Is an important part. The applicant has developed a technique for forming a logo portion on a vehicle wheel, and this technique is disclosed in Patent Document 1. In the technique disclosed in Patent Document 1, in a vehicle wheel, a logo portion is formed while exposing a metal surface by cutting a coating film and a base metal on a part of a painted portion of a disc or a rim by machining. , The logo part is formed with an engraved part that has a continuous surface with uneven streaks, leaving the blades of the machine tool, and the engraved part is coated with clear paint so as to even out the unevenness on the surface of the uneven streaks. As a result, a transparent layer is formed so that the engraved portion emphasizes the three-dimensional effect.

Japanese Patent No. 6153437

When the logo portion is engraved with a cutting tool, uneven streaks are formed on the metal surface by processing the logo portion with a locus in which processing lines are arranged in a plurality of rows using a cutting tool having a relatively small diameter. After that, in order to form a clear coating film on the uneven streaks, it is necessary to form a clear coating film having a film thickness that covers the apex of the convex portion of the uneven streaks. As a method for forming a clear coating film that reliably covers the apex of the convex portion, for example, the following two methods can be considered.

The first method is a method of coating a thick film by increasing the amount of the clear paint applied until a clear coating film is formed at the apex of the convex portion of the uneven streaks. However, in this first method, if the clear paint is coated with a thick film with one coat, there is a possibility that the wheel for a vehicle having a three-dimensional curved surface may cause coating sagging or boiling after drying, resulting in poor coating.

The second method is a method in which one coat is applied with a clear coating amount that does not cause coating sagging or boiling after drying, and then the clear coating is applied again after baking and drying. However, in this second method, the number of man-hours for painting, the number of man-hours for baking and drying, and the like are increased, and the work time for the painting process is also lengthened.

Therefore, in order to form a clear coating film efficiently and economically, one coat can be applied with a clear coating amount that can be formed to a recommended film thickness without causing coating sagging or boiling after drying. It is preferable to do so.

By the way, when engraving the logo design shape of the logo part, when a cutting tool (for example, a ball end mill) traces a processing trajectory that traces the alignment of the logo design shape, depending on the logo design shape, the engraved surface is shaved. Highly leftover convex parts (cusps) may be formed. For example, the case where the letter "A" is engraved will be described below.

As shown by the one-point chain line with an arrow in FIG. 7, the cutting tool starts cutting from the lower left of the letter "A", moves the line diagonally upward to the right, and then moves the line downward. The machining locus 8 is traced along the alignment of the letter "A" so as to return slightly upward and finally move linearly to the left lateral direction to reach the shaded portion on the left. To draw a thick line width of a character, the cutting tool is made to follow a machining locus in which a plurality of rows of machining lines are arranged with a predetermined pick feed amount. In this case, in the portion where a plurality of machining lines are arranged, uneven streaks are formed between the adjacent machining lines due to the convex portion of the cutting tool left uncut. The height of the convex portion formed between the processing lines of the plurality of rows can be made low by reducing the pick feed amount of the cutting tool.

On the other hand, in the specific corner portion 7 of the letter "A", a convex portion 62 having a high uncut portion of the cutting tool is formed due to the change of the machining direction of the cutting tool and the connection / intersection with the machining line. Then, as described above, when the clear paint is applied with one coat in a coating amount that does not cause coating sagging or boiling after drying and can be formed to the recommended film thickness with one coat, the high convex portion 62 of the corner portion 7 The clear coating film 43 is not formed at the apex of the above, or the clear coating film 43 at the apex of the convex portion 62 becomes less than a predetermined film thickness (see FIG. 5A). In that case, there is a possibility that the clear coating film 43 may be peeled off from the high convex portion 62 as a starting point, or thread rust may be generated along the high convex portion 62 with the passage of time.

The present invention has been made in view of the above circumstances, and is a vehicle wheel capable of forming a clear coating film having a sufficient thickness without having a high convex portion at the corner portion of the engraved surface of the logo portion. And a method for forming a logo portion of a vehicle wheel.

The vehicle wheel according to the present invention is
A light alloy vehicle wheel with a wheel body consisting of a rim in an integral or split structure and a disc with multiple spokes.
The painted part where the base color is painted on the wheel body and a part of the painted part of the disc or rim including the spokes are machined to cut the paint film and the base metal of the wheel body to expose the metal surface. It has a logo part composed of letters, figures, symbols, etc. formed by the spokes.
The logo portion has an engraved surface which is a metal surface engraved by a cutting tool, and a clear coating film formed by applying a colored or colorless clear paint on the engraved surface.
The engraved surface has a high convex portion having a certain height or more that is formed as uncut portion on the machining locus of a cutting tool that traces the alignment of the logo design shape at a specific corner portion of the logo design shape of the logo portion. It has a convex removal processing locus structure that is a low place to be removed.

The method for forming a logo portion of a vehicle wheel according to the present invention is as follows.
A method of forming a logo on a light alloy vehicle wheel having a wheel body composed of a rim and a disc having a plurality of spokes in an integral or split structure.
Characters, figures, or characters, figures, or The engraving process that forms the engraved surface of the logo part consisting of symbols, etc.
It has a coating process of applying a colored or colorless clear paint on the engraved surface to form a clear coating film.
In the engraving process, a cutting tool is moved so as to trace the alignment of the logo design shape of the logo portion to perform engraving, so that a constant height is formed on the engraved surface as uncut portion on the machining locus of the cutting tool. Identify the corner part of the logo design shape where the above high convex part is formed,
In the specific corner portion, the cutting tool performs a convex removing operation which is a machining locus that reciprocates along the corner portion or toward the corner portion while shifting by a predetermined pick feed amount, and the convex becomes a low place. This is a method of forming a removal processing locus structure.

According to the present invention, by providing the convex removal processing locus structure on the engraved surface of the logo portion, a high convex portion is not formed in the corner portion of the logo design shape. For example, in the formation of a clear coating film on the engraved surface, coating of the clear coating film is performed with an coating amount that does not cause coating sagging or boiling after drying and that can form a clear coating film of a recommended film thickness with one coating. Even when the coating is performed, a clear coating film having a sufficient film thickness is formed on the corner portion of the logo design shape. Therefore, it is possible to form a clear coating film having a sufficient film thickness on the entire engraved surface. Therefore, it is possible to prevent peeling of the clear coating film and thread rust in the logo portion for a long period of time, and it is possible to stably exhibit the high designability obtained by engraving the logo portion over a long period of time.

It is a front view which shows the wheel for a vehicle by embodiment. It is sectional drawing which shows the wheel for a vehicle by embodiment. It is an enlarged view which shows the part of the logo part formed on the spoke by enlargement. It is sectional drawing which shows the cross-sectional structure in the painted part and the logo part. It is a cross-sectional view which shows the cross-sectional structure in the corner part of the logo design shape of a logo part, FIG. It is sectional drawing which shows the carved surface which formed the convex removal processing locus structure which became the low place where the part is removed. As an example of the method of forming the logo portion, it is explanatory drawing for demonstrating the processing locus which performs the convex removal operation which removes a high convex part at the time of forming an engraving processed surface. As an example of the method of forming the logo portion, it is an explanatory diagram for explaining that a high convex portion is formed by a processing locus traced along a linear line when forming an engraved surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the vehicle wheel 1 of the embodiment constitutes the wheel body 10 by the rim 2 and the disc 3. The vehicle wheel 1 is made of a light alloy, for example, made of an aluminum alloy, a magnesium alloy, or the like. The vehicle wheel 1 may have a rim 2 and a disc 3 having an integral structure or a divided structure, and the rim 2 and the disc 3 can be manufactured by forging or casting. The rim 2 has a cylindrical shape as a whole, and rim flanges 21 extending radially outward are formed at both ends of the cylindrical shape. The disk 3 includes a hub hole 31 that fits into the vehicle hub, and a plurality of spokes 32 that are radially provided in the outer peripheral direction from the hub hole 31. The surface side of the rim flange 21 and the disc 3 constitutes a design surface of the vehicle wheel 1 formed by a three-dimensional curved surface.

As shown in FIG. 3, the vehicle wheel 1 includes a painted portion 5 painted in a predetermined base color and a logo portion 6 having a metallic brilliance formed on a part of the painted portion 5 on the top surface of the spoke 32. Has. The logo portion 6 is configured in a predetermined logo design shape such as characters, figures, symbols, and the like. The logo portion 6 can be formed on a part of the disc 3 or the rim 2 including the spoke 32, such as the side surface of the spoke 32, the disc surface other than the spoke 32, and the rim flange surface, in addition to the top surface of the spoke 32.

As shown in FIG. 4, the coating portion 5 has a layer structure formed of a primer layer 41, a base color coating film 42, and a clear coating film 43 on a metal base of the wheel body 10. In the logo portion 6, after the base color coating film 42 is formed on the wheel body 10, the coating film 42, the primer layer 41 and the base metal of the wheel body 10 are cut by machining to form the metal surface of the wheel body 10. It has an exposed engraved surface 61 and a clear coating film 43 formed on the engraved surface 61. The clear coating film 43 of the logo portion 6 is formed at the same time as the clear coating film 43 of the coating portion 5. The clear coating film 43 is a colorless clear coating film, but may be a colored color clear coating film. The engraved surface 61 of the logo portion 6 is coated with the clear coating film 43 after the primer layer 41, the base color coating film 42 and the clear coating film 43 are formed on the metal surface of the wheel body 10. The base metal of the film 42, the primer layer 41, and the wheel body 10 may be cut to expose the metal surface. Further, a color clear coating film of a predetermined color may be formed on the clear coating film 43 on a part or all of the logo portion 6.

The engraved surface 61 is a metal surface engraved by a cutting tool (for example, various cutting tools such as a ball end mill) so as to form the logo design shape of the logo portion 6. The engraved surface 61 is basically formed by the machining locus shape of the cutting tool traced along the line of the logo design shape in the component (for example, one character) of the logo portion 6. The characters and the like of the logo portion 6 can be formed by moving the cutting tool as if writing with a single stroke, for example. All or part of the lines of the logo design shape of the logo portion 6 can be formed by a machining locus shape in which one or a plurality of machining lines of a cutting tool are arranged.

By the way, when a cutting tool is traced along the alignment of the logo design shape of the logo portion 6 to form the engraved surface 61, depending on the logo design shape, the specific corner portion 7 of the logo design shape on the engraved surface 61 may be formed. Will form a high convex portion 62 having a certain height or more on the machining locus 8 of the cutting tool as uncut portion (see FIGS. 5 (a) and 7). The clear coating film 43 is not formed on the high convex portion 62, or as shown in FIG. 5A, the clear coating film 43 at the apex of the convex portion 62 becomes a thin film having a film thickness less than a predetermined film thickness. It ends up. In the present embodiment, the engraved surface 61 is formed as an uncut portion on the machining locus 8 of the cutting tool traced along the alignment of the logo design shape at a specific corner portion 7 of the logo design shape. It is provided with a convex removal processing locus structure 63 (see FIGS. 5 (b) and 6), which is a low position from which a higher convex portion 62 is removed. For example, the convex removal processing locus structure 63 is formed in the corner portion 7 having a substantially acute angle in the logo design shape (see FIG. 6). Here, the "substantially acute corner portion 7" includes a corner portion 7 in which the convex portion 62 having a high uncut portion is formed even if the angle is not only an acute angle smaller than a right angle but also an acute angle or an obtuse angle close to a right angle. Therefore, in the specific corner portion 7 of the logo design shape, as shown in FIG. 5B, the convex removal processing locus structure 63, which is a low place where the high convex portion 62 is removed, is formed, so that the clear coating is applied. The film 43 is formed to have a sufficient film thickness.

The convex removal machining locus structure 63 is a machining locus structure formed by reciprocating along the corner portion 7 or toward the corner portion 7 while shifting the cutting tool by a predetermined pick feed amount. is there. Therefore, the engraved surface 61 does not have a convex portion 62 having a height higher than a certain height. For example, as shown in FIG. 6, the letter “A” has a configuration in which the convex removal processing locus structure 63 is formed at the four substantially acute-angled corner portions 71 to 74 and the high convex portion 62 is not formed. .. The linear portions other than the four substantially acute-angled corner portions 7 of the letter "A" have a machining locus shape of the cutting tool traced along the alignment of the letter "A". It should be noted that, like the letter "C", the engraved surface 61, which is formed of a linear shape such as an arc shape or an R shape and does not have a corner portion 7 having an acute angle, does not have a high convex portion 62 formed. , The logo design consists only of the machining trajectory shape of the cutting tool traced along the linear shape.

The high convex portion 62 having a certain height or more is a vehicle wheel 1 having a three-dimensional curved surface, and the clear coating film 43 formed on the engraved surface 61 causes coating sagging and boiling after drying. Depending on the application of one coat of clear paint with a predetermined coating amount, the clear coating film 43 may not be formed at the apex of the convex portion 62, or the clear coating film 43 may be formed at the apex of the convex portion 62 only with a film thickness less than the predetermined film thickness. It is a high convex portion 62 that is not formed. Here, the predetermined coating amount is the coating amount of the clear coating film capable of forming the clear coating film 43 in a recommended film thickness of, for example, about 25 to 35 μm with one coat. The predetermined film thickness less than the predetermined film thickness is, for example, about 7 μm. That is, in the present embodiment, due to the convex removal processing locus structure 63 described above, the engraved surface 61 does not have a high convex portion 62 having a certain height or higher. Therefore, the clear coating film 43 on the engraved surface 61 has a logo. A clear coating film 43 having a film thickness of 25 μm or more (at least 7 μm or more) can be formed on the corner portion 7 of the design shape (see FIG. 5B). Therefore, the clear coating film 43 formed on the engraved surface 61 has a coating amount that does not cause coating sagging or boiling after drying and can form a clear coating film 43 having a recommended film thickness with one coating. Even when coating is performed with one coat, a clear coating film 43 having a sufficient film thickness is also formed on the corner portion 7 having the logo design shape.

Next, an example of the method of forming the logo portion 6 will be described.
First, a primer paint is applied to the entire surface of the wheel body 10 that has been pretreated before forming the coating film to form a primer layer 41, and a solvent paint of the base color of the vehicle wheel 1 is formed on the primer layer 41. To form a coating film 42. Then, the engraving process of forming the engraved surface 61 of the logo portion 6 by engraving the predetermined portion on which the coating film 42 is formed with a cutting tool, and the clear coating film by applying the clear paint on the engraved surface 61. The logo portion 6 is formed by performing the painting step of forming the 43.

In the engraving process, a machine tool such as a machining center is CNC-controlled and engraved using a cutting tool (ball end mill) to form a coating film 42, a primer layer 41, and a wheel body 10 at a predetermined portion where the coating film 42 is formed. While the metal surface of the wheel body 10 is exposed by cutting the base metal of the above, the engraved surface 61 of the logo design shape of the logo portion 6 composed of characters, figures, symbols and the like is formed.

During this engraving, if the cutting tool is moved along the machining locus 8 that traces along the alignment of the logo design shape, depending on the logo design shape of the logo portion 6, the engraving surface 61 may be on the machining locus 8 of the cutting tool. A high convex portion 62 may be formed as an uncut portion. For example, as shown in FIG. 7, in the case of the letter "A", in the corner portion 7 having a substantially acute angle of the letter "A", the cutting tool is changed in the machining direction and is connected / crossed with the machining line. A convex portion 62 having a high uncut portion of the cutting tool is formed (see FIGS. 5 (a) and 7). In the next coating step, in order to efficiently and economically form the clear coating film 43 formed on the engraved surface 61, there is no coating sagging or boiling after drying, and one coating is formed to the recommended film thickness. It is preferable to form a clear paint coating with one coat in a possible coating amount. Therefore, if the high convex portion 62 formed in the substantially acute corner portion 7 of the logo design shape is coated with the clear paint with the above-mentioned coating amount, the clear coating film 43 is not formed or the clear coating is applied. The film thickness of the film 43 is less than the predetermined film thickness (see FIG. 5A).

Therefore, in the present embodiment, the engraving process basically moves the cutting tool based on the machining locus program that traces along the alignment of the logo design shape of the logo portion 6, but in this machining locus program, the cutting tool is moved. A corner portion 7 having a logo design shape in which a high convex portion 62 having a certain height or more formed as uncut portion is formed on the machining locus 8 is specified, and the machining locus program is changed in this specific corner portion 7. And then engrave. In the specific corner portion 7, a convex removing operation is performed so as to form a machining locus 8 in which the cutting tool reciprocates along the corner portion 7 or toward the corner portion 7 while shifting by a predetermined pick feed amount. As a result, in the specific corner portion 7, the convex removal processing locus structure 63 which is a low place where the high convex portion 62 having a certain height or more is removed is formed.

For example, in the case of the character "A" of the logo design shape shown in FIG. 6, a substantially sharp corner portion 7 is specified as a specific corner portion 7, and specifically, the apex portion of the character "A" and "A". A total of four locations are specified, three at the left and right ends of the horizontal line of the letter A. In the following, for convenience of explanation, as a substantially sharp corner portion 7, the lower portion of the apex portion of the letter “A” is the first corner portion 71, and the lower portion of the right end portion of the horizontal line of the character “A” is the second corner portion 72. , The upper right end portion of the horizontal line of the letter "A" will be referred to as the third corner portion 73, and the upper portion of the left end portion of the horizontal line of the letter "A" will be referred to as the fourth corner portion 74. Then, in these substantially sharp corner portions 71 to 74, the portion of the machining locus program that performs the motion of tracing along the alignment of the letter "A" is changed to the machining locus program that performs the following convex removal operation.

As shown by the one-point chain line with an arrow as the machining locus 8 of the cutting tool in FIG. 6, first, the cutting tool is started to cut from the lower left of the letter "A" and is linearly moved diagonally upward to the right. When approaching the first corner portion 71, in the first corner portion 71, the corner shape of the first corner portion 71 is formed while shifting by a predetermined pick feed amount (for example, 1/2 of the cutting tool diameter of the cutting tool). A convex removal operation is performed by reciprocating along the arc. In the convex removal operation in the first corner portion 71, for example, the cutting tool is reciprocated twice. As a result, the convex removal machining locus structure 63, which is a low place, is formed in the first corner portion 71, so that the high convexity is formed as an uncut portion in the bent inner portion in the machining locus 8 that traces the alignment. The formation of site 62 is inhibited.

Subsequently, the cutting tool is linearly moved downward from the first corner portion 71, and is linearly moved slightly upward from the lower end portion toward the second corner portion 72. The second corner portion 72 exists at a position facing the upper third corner portion 73. Therefore, in the second and third corner portions 72 and 73, when the cutting tool approaches the second corner portion 72, for example, the cutting tool is subjected to a predetermined pick feed amount (for example, with respect to the second corner portion 72). , While shifting by 1/2) of the cutting tool diameter), a convex removing operation is performed in which the second corner portion 72 is reciprocated in a substantially arc shape along the corner shape. In the convex removal operation in the second corner portion 72, for example, the cutting tool is reciprocated twice. At the same time, the convex removing operation for the second corner portion 72 is a convex removing operation in which the cutting tool reciprocates with respect to the upper third corner portion 73 so as to move toward the corner shape of the third corner portion 73. As a result, the convex removal processing locus structure 63, which is a low place, is formed at the same time in the second and third corner portions 72 and 73, so that the processing locus 8 that traces the alignment is formed as a bent inner portion as an uncut portion. The formation of the high convex portion 62 that is to be formed is inhibited.

Subsequently, when the cutting tool is linearly moved from the second and third corner portions 72 and 73 in the left lateral direction and approaches the fourth corner portion 74, the fourth corner portion 74 has a predetermined pick feed amount. (For example, a convex removing operation of reciprocating in a substantially arc shape along the corner shape of the fourth corner portion 74 while shifting by 1/2 of the cutting tool diameter of the cutting tool) is performed. In the convex removal operation in the fourth corner portion 74, for example, the cutting tool is moved four and a half reciprocations. As a result, the convex removal machining locus structure 63, which is a low place, is formed in the fourth corner portion 74, so that the high convex portion is formed as an uncut portion in the bent inner portion in the machining locus 8 that traces the alignment. The formation of 62 is inhibited.

In this way, the engraved surface 61 of the letter "A" is formed as uncut portion on the machining locus 8 traced along the alignment of the letter "A" at the four substantially sharp corner portions 71 to 74. A convex removal processing locus structure 63 is formed, which is a low place where a high convex portion 62 having a certain height or more is removed.
It should be noted that the above-mentioned engraving operation is an example, and the cutting tool is operated by various methods such as rotating the cutting tool along the letter A so as to perform the convex removal operation at each corner portion in an appropriate order. May be good.

From the above, according to the present embodiment, since the engraving surface 61 is provided with the convex removal processing locus structure 63 which is a low place where the high convex portion 62 having a certain height or more is removed, the engraving processing of the logo portion 6 is performed. No high convex portion 62 is formed on the surface 61. Therefore, in the next coating step, for example, even when the clear paint is applied with one coat in a coating amount that does not cause coating sagging or boiling after drying and can be formed to the recommended film thickness with one coating. A clear coating film 43 having a sufficient film thickness is also formed on the corner portion 7 of the logo design shape on the engraved surface 61, and it is possible to form a clear coating film 43 having a sufficient film thickness on the entire engraved surface 61. Become. Therefore, it is possible to prevent the clear coating film 43 from peeling off and thread rust from occurring in the logo portion 6 for a long period of time, and the high designability obtained by the engraving process of the logo portion 6 can be exhibited in a long-term and stable manner. Can be done.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the claims.

1 Vehicle wheel 2 Rim 3 Disc 5 Painted part 6 Logo part 7 Corner part 8 Machining locus 10 Wheel body 21 Rim flange 31 Hub hole 32 Spoke 41 Primer layer 42 Base color coating 43 Clear coating 61 Engraved surface 62 High convex Part 63 Convex removal processing locus structure

Claims (5)

A light alloy vehicle wheel with a wheel body consisting of a rim in an integral or split structure and a disc with multiple spokes.
The painted part where the base color is painted on the wheel body and a part of the painted part of the disc or rim including the spokes are machined to cut the paint film and the base metal of the wheel body to expose the metal surface. It has a logo part composed of letters, figures, symbols, etc. formed by the spokes.
The logo portion has an engraved surface which is a metal surface engraved by a cutting tool, and a clear coating film formed by applying a colored or colorless clear paint on the engraved surface.
The engraved surface has a high convex portion having a certain height or more that is formed as uncut portion on the machining locus of a cutting tool that traces the alignment of the logo design shape at a specific corner portion of the logo design shape of the logo portion. A vehicle wheel with a convex removal processing locus structure that is a low place to be removed. In the vehicle wheel according to claim 1,
The convex removal machining locus structure is a vehicle wheel having a machining locus structure formed by reciprocating a cutting tool at a corner portion while shifting by a predetermined pick feed amount. In the vehicle wheel according to claim 1 or 2.
The high convex portion having a certain height or more is one coat with a coating amount that can be formed to a predetermined film thickness with one coat without causing coating sagging or boiling after drying in the clear coating film formed on the engraved surface. A vehicle wheel that is a high convex part where a clear coating film is not formed at the apex of the convex part or is formed only under a predetermined film thickness depending on the coating of the clear paint. A method of forming a logo on a light alloy vehicle wheel having a wheel body composed of a rim and a disc having a plurality of spokes in an integral or split structure.
By machining a part of the disc or rim including the spokes whose wheel body is painted with the base color, the coating film and the base metal of the wheel body are cut to expose the metal surface, and the characters, figures, or The engraving process that forms the engraved surface of the logo part consisting of symbols, etc.
It has a coating process of applying a colored or colorless clear paint on the engraved surface to form a clear coating film.
In the engraving process, a cutting tool is moved so as to trace the alignment of the logo design shape of the logo portion to perform engraving, so that a constant height is formed on the engraved surface as uncut portion on the machining locus of the cutting tool. Identify the corner part of the logo design shape where the above high convex part is formed,
In the specific corner portion, the cutting tool performs a convex removing operation which is a machining locus that reciprocates along the corner portion or toward the corner portion while shifting by a predetermined pick feed amount, and the convex becomes a low place. Removal processing A method for forming a logo portion of a vehicle wheel that forms a locus structure. In the method for forming a logo portion of a vehicle wheel according to claim 4.
The specific corner portion is a method for forming a logo portion of a vehicle wheel including a substantially acute-angled corner portion having a logo design shape.

Images