Workpiece and method for manufacturing workpiece

Abstract

The present invention relates to a workpiece and a method for manufacturing the workpiece, wherein the workpiece is capable of preventing the coating material on the coating surface from peeling off when the machining surface located adjacent to the coating surface is machined after the coating surface is coated. The workpiece comprises a main body and a coating material applied to the main body, wherein the main body comprises: a machining surface formed by machining; a coating surface disposed adjacent to the machining surface across an interface with the machining surface and coated with the coating material; and a recessed portion formed in the main body in a manner recessed from the machining surface and the coating surface toward the inside of the main body at the interface, and extending along the interface in a manner that separates the machining surface and the coating surface from each other.

Description

Technical Field

[0001] The invention relates to a workpiece having a processed surface and a painted surface and a method for manufacturing the workpiece. Background Art

[0002] A stator of a rotary electric motor is known (for example, Japanese Patent Application Publication No. 2013-236430). Such a stator has a workpiece (a stator housing, a flange member, etc.) as a component thereof, and the workpiece has a processed surface and a coating surface (for example, an outer peripheral surface), the processed surface is machined by a lathe, etc., and the coating surface is coated with a coating material. Summary of the invention

[0003] Problem that the invention aims to solve

[0004] Conventionally, when a processed surface adjacent to a painted surface is machined after the painted surface is painted, the coating material on the painted surface may peel off.

[0005] Solutions for solving problems

[0006] In a technical solution disclosed in the present invention, a workpiece has a main body and a coating material applied to the main body, wherein the main body has: a machined surface, which is formed by mechanical processing; a coating surface, which is arranged at an adjacent position of the machined surface across an interface with the machined surface and is coated with the coating material; and a recessed portion, which is formed in the main body in a manner that is recessed from the machined surface and the coating surface toward the inner side of the main body at the interface, and extends along the interface in a manner that separates the machined surface and the coating surface from each other.

[0007] In one technical solution of the present disclosure, the recess has: a first recess that is recessed from the processed surface toward the inside of the main body; and a second recess that is arranged between the first recess and the painted surface and is recessed from the painted surface toward the inside of the main body.

[0008] In one aspect of the present disclosure, the recess is defined by two surfaces, and the two surfaces intersect each other to form a predetermined angle.

[0009] In a technical solution of the present disclosure, the predetermined angle is less than 90°.

[0010] In one aspect of the present disclosure, the main body further includes an additional recessed portion, and the additional recessed portion is formed so as to be recessed toward the inside of the main body from one of two surfaces defining the recessed portion.

[0011] In one aspect of the present disclosure, the imaginary extended surface of the processed surface and the imaginary extended surface of the painted surface intersect each other so as to form an angle of 90° or more.

[0012] A technical solution disclosed in the present invention is a method for manufacturing the above-mentioned workpiece. In the method for manufacturing the above-mentioned workpiece, a substrate of a main body is prepared, and the substrate has: an unprocessed surface; a painted surface, which is arranged at an adjacent position of the unprocessed surface across an interface with the unprocessed surface; and a recessed portion formed at the interface. After applying a coating material to the painted surface of the substrate, the unprocessed surface is mechanically processed to form a processed surface.

[0013] Effects of the Invention

[0014] According to the present disclosure, since the painted surface and the processed surface are separated from each other by the recess, even after the painted surface is painted, if the processed surface adjacent to the painted surface is machined, only the coating material on the recess surface will be peeled off, and the coating material on the painted surface can be prevented from peeling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front perspective view of a workpiece according to one embodiment.

[0016] Figure 2 yes Figure 1 Rear perspective view of the workpiece shown.

[0017] Figure 3 yes Figure 1 A side view of the workpiece is shown.

[0018] Figure 4 yes Figure 3 An enlarged cross-sectional view of region IV in FIG.

[0019] Figure 5 Yes means Figure 1 A flow chart of an example of a method for manufacturing a workpiece is shown.

[0020] Figure 6 yes Figure 1 A rear perspective view of the substrate of the main body portion is shown.

[0021] Figure 7 It is used to illustrate Figure 5 The diagram of step S2 in , and is Figure 4 Corresponding enlarged cross-sectional view.

[0022] Figure 8 express Figure 5 The state at the end of step S2 in .

[0023] Fig. 9 is to use Figure 5 An enlarged cross-sectional view of the assembly produced in step S4 of FIG.

[0024] Fig.10 This is an enlarged cross-sectional view of a main body portion of another embodiment.

[0025] Fig.11 This is an enlarged cross-sectional view of a main body portion of still another embodiment.

[0026] Fig.12 This is an enlarged cross-sectional view of a main body portion of still another embodiment.

[0027] Fig.13 This is an enlarged cross-sectional view of a main body portion of still another embodiment.

[0028] Fig.14 This is an enlarged cross-sectional view of a main body portion of still another embodiment.

[0029] Fig.15 This is an enlarged cross-sectional view of a main body portion of still another embodiment.

[0030] Fig.16 This is an enlarged cross-sectional view of an assembly of workpieces according to another embodiment.

[0031] Fig.17 This is an enlarged cross-sectional view of an assembly of workpieces according to still another embodiment.

[0032] Fig.18 It is an enlarged cross-sectional view of a workpiece according to another embodiment. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present disclosure will be described in detail based on the accompanying drawings. In addition, in the various embodiments described below, the same elements are marked with the same reference numerals, and repeated descriptions are omitted. In addition, in the following description, the so-called axial direction refers to the direction along the central axis O of the workpiece 10 and the workpiece 50, the so-called radial direction refers to the radial direction of a circle centered on the axis O, and the so-called circumferential direction refers to the circumferential direction of the circle. In addition, for convenience, the direction in the axial direction toward the left side of the paper in the figure is described as the axial front.

[0034] First, refer to Figure 1 to Figure 4 The workpiece 10 of one embodiment will be described. The workpiece 10 is, for example, a stator housing of a motor stator and is connected to the workpiece 50. The workpiece 10 includes a body 12 and a coating material 14. The body 12 is a cylindrical member having a central axis O and is formed of, for example, metal (iron, aluminum, etc.).

[0035] The main body 12 has: an inner peripheral surface 16; a painted surface 18 located on the side opposite to the inner peripheral surface 16; an end surface 20 on the axial front side; a processed surface 22 located on the side opposite to the end surface 20; and a recessed portion 26 formed at the boundary between the processed surface 22 and the painted surface 18. The inner peripheral surface 16 is an annular surface surrounding the axis O and defines a through hole that passes through the center of the main body 12 in the axial direction.

[0036] The coating surface 18 is a cylindrical surface that is arranged around the axis O and is substantially octagonal when viewed from the axial direction. It is arranged adjacent to the processed surface 22 across the boundary and defines the outer peripheral surface of the main body 12 on the opposite side to the inner peripheral surface 16. The end surface 20 and the processed surface 22 extend between the inner peripheral surface 16 and the coating surface 18 in a mutually parallel manner.

[0037] In the present embodiment, both the end face 20 and the processed face 22 are substantially orthogonal to the coating face 18 (or the axis O). In other words, the imaginary extended face formed by extending the processed face 22 radially outward and the imaginary extended face formed by extending the coating face 18 axially rearward intersect at an angle of 90°. The processed face 22 defines the end face of the main body 12 on the axial rear side of the side opposite to the end face 20. The processed face 22 is a face machined using a lathe, a milling machine, or a machining center or other machine tool.

[0038] The concave portion 26 is formed in the main body 12 at the boundary between the processed surface 22 and the painted surface 18 in a manner that is recessed from the processed surface 22 and the painted surface 18 toward the inner side of the main body 12. Figure 4 As shown, the recess 26 is defined by a first surface 28 and a second surface 30 , wherein the first surface 28 extends radially inward from the axial rear end of the coating surface 18 , and the second surface 30 extends axially forward from the radial outer end of the processing surface 22 and is connected to the first surface 28 .

[0039] The first surface 28 is a circular annular plane around the axis O and orthogonal to the axis O, while the second surface 30 is a cylindrical surface around the axis O. The first surface 28 and the second surface 30 intersect each other (i.e., orthogonal) in a manner of forming an angle of 90°. The recess 26 extends circumferentially along the boundary between the coating surface 18 and the processing surface 22, so that the coating surface 18 and the processing surface 22 are separated from each other. The technical significance of the recess 26 will be described later.

[0040] The coating material 14 is applied to the coating surface 18 of the main body 12. The coating material 14 is provided to improve the aesthetic appearance of the workpiece 10 and to prevent rust on the coating surface 18. In addition, when the coating material 14 is black, the coating material 14 can also be used to improve the heat dissipation performance of the workpiece 10. In addition, in the present embodiment, the coating material 14 is also attached to the first surface 28 of the recessed portion 26.

[0041] The workpiece 50 is, for example, a flange member fixed to the axial end of the stator housing of the motor, and is formed of metal, etc. Specifically, the workpiece 50 is a cylindrical member centered on the central axis O, and has: a base plate 52; a first protrusion 54 protruding axially forward from an end surface 64 on the axial front side of the base plate 52; and an annular second protrusion 62 protruding axially forward from an end surface 56 on the axial front side of the first protrusion 54.

[0042] The substrate 52 has an end face 64, an end face 66 on the axially rear side opposite to the end face 64, and an outer peripheral surface 68 extending between the end face 64 and the end face 66. The end face 64 and the end face 66 are arranged parallel to each other and are both approximately orthogonal to the outer peripheral surface 68 (or the axis O). The outer peripheral surface 68 is a cylindrical surface that is approximately octagonal when viewed from the axial direction, similarly to the above-mentioned coating surface 18.

[0043] A through hole 70 is formed in the center of the second protrusion 62, and a hole 72 ( Figure 2 In the present embodiment, the end surface 64 of the substrate 52, the outer peripheral surface 74 of the first protrusion 54, the end surface 56 on the axial front side, and the outer peripheral surface 78 of the second protrusion 62 are all machined surfaces similar to the machined surface 22 described above.

[0044] The workpiece 50 is connected to the workpiece 10 in a concentric manner. When the workpieces 10 and 50 are connected to each other, the first protrusion 54 and the second protrusion 62 are inserted into the through hole defined by the inner peripheral surface 16 of the workpiece 10. At this time, the machined surface 22 of the workpiece 10 and the end surface 64 of the workpiece 50 are in surface contact with each other, and the inner peripheral surface 16 of the workpiece 10 and the outer peripheral surface 74 of the first protrusion 54 of the workpiece 50 face each other (or contact).

[0045] Next, refer to Figures 5 to 9 A method for manufacturing the workpiece 10 will be described. Figure 5 In step S1, the manufacturer prepares the base material 12' ( Figure 6 ). For example, the substrate 12' is made by die casting. Figure 6 As shown, the substrate 12' has substantially the same outer shape as the main body 12, and has an inner peripheral surface 16, a painted surface 18, an end surface 20, an unprocessed surface 22', and a recessed portion 26 formed at the boundary between the unprocessed surface 22' and the painted surface 18. The unprocessed surface 22' is a surface corresponding to the processed surface 22, that is, a rough surface that has not been machined. The painted surface 18 is arranged adjacent to the unprocessed surface 22' across the boundary.

[0046] Alternatively, in step S1, the manufacturer first prepares a substrate having an inner peripheral surface 16, a coating surface 18, an end surface 20, and an unprocessed surface 22', but having no recess 26, and then performs mechanical processing on the substrate to form the recess 26, thereby producing Figure 6 The substrate 12' is shown.

[0047] In step S2, the manufacturer applies a coating material to the coating surface 18 of the substrate 12'. Figure 7 As shown, the manufacturer first sets the mask member 100 at the radially outer end of the unprocessed surface 22'. The mask member 100 is a member for protecting the unprocessed surface 22' from the coating material. In addition, the mask member 100 can also be configured to cover the entire area of ​​the unprocessed surface 22'.

[0048] Next, the manufacturer arranges the coating material applicator (sprayer) 102 relative to the coating surface 18 in such a manner that the spray axis A of the coating material sprayed from the coating material applicator 102 intersects (e.g., is orthogonal to) the coating surface 18. Next, the manufacturer operates the coating material applicator 102 to spray the liquid coating material toward the coating surface 18, thereby coating the coating surface 18.

[0049] As an example, the manufacturer uses the coating material applicator 102 to apply the coating material from the axial front end toward the axial rear end of the coating surface 18. Figure 8 As shown, by this coating, the coating material 14 can be applied not only to the coating surface 18 but also to the first surface 28 and the second surface 30 of the recessed portion 26. Figure 8 The state in which the mask member 100 is removed after the coating material 14 is applied is shown.

[0050] Refer again Figure 5 In step S3, the manufacturer performs mechanical processing on the unprocessed surface 22' of the substrate 12'. For example, the manufacturer uses a machine tool to perform cutting processing on the unprocessed surface 22' from the radial inner end edge to the radial outer end edge. The result is the formation of the above-mentioned processed surface 22. During this processing, when the tool of the machine tool reaches the radial outer end edge of the unprocessed surface 22', the tool can contact the axial rear end 14a of the coating material 14 applied on the second surface 30 and apply force to it radially outward. As a result, the coating material 14 on the second surface 30 can be peeled off from the second surface 30 toward the radial outer side with the rear end 14a as the starting point.

[0051] Here, in this embodiment, since the coating surface 18 and the processing surface 22 are separated by the recessed portion 26, it is possible to prevent the coating material 14 from being peeled off by the tool and from being carried out to the coating material 14 on the coating surface 18. Figure 8When a force is applied radially outward to the rear end 14a of the coating material 14 by the tool, stress concentration occurs at the bent portion P of the coating material 14 formed at the connection portion 24 between the first surface 28 and the second surface 30, and the coating material 14 becomes more easily damaged at the bent portion P.

[0052] The results, such as Figure 4 As shown, even if force is applied radially outward to the rear end 14a of the coating material 14 by contact with the tool, only the coating material 14 on the second surface 30 is peeled off, and the coating material 14 on the coating surface 18 can be prevented from being peeled off. Therefore, the coating material 14 applied on the coating surface 18 can be protected over the entire area. In this way, the above-mentioned workpiece 10 is manufactured.

[0053] After manufacturing the workpiece 10, the manufacturer manufactures an assembly 140 of the workpiece 10 and the workpiece 50. Specifically, Fig. 9 As shown, the manufacturer connects the workpiece 10 and the workpiece 50 to each other so that the machined surface 22 of the workpiece 10 is in surface contact with the end surface 64 of the substrate 52 of the workpiece 50. Here, the machined surface 22 and the end surface 64 are machined and thus are in close contact with each other.

[0054] As described above, in the present embodiment, the coating material 14 on the coating surface 18 is not peeled off in step S3. In other words, the area where the coating material 14 may be peeled off due to the execution of step S3 is limited to the area of ​​the axial width W of the recess 26. Therefore, the aesthetics of the coating applied to the coating surface 18 can be improved. In addition, from the perspective of the aesthetics of the coating of the coating surface 18, the width W of the recess 26 corresponding to the area where the coating material 14 may be peeled off due to the execution of step S3 is set to a value as small as possible (for example, less than 1 mm) in consideration of the thickness of the coating material 14 and the like.

[0055] In the present embodiment, since the first surface 28 of the recessed portion 26 is orthogonal to the second surface 30, stress concentration can be effectively generated at the bent portion P, and when the coating material 14 on the second surface 30 is about to peel off toward the radially outer side, the coating material 14 can be reliably broken at the bent portion P. Therefore, it is possible to effectively prevent the coating material 14 from peeling off to the coating surface 18.

[0056] There are various modifications of the concave portion 26 for preventing paint peeling. Figure 10 to Figure 14 A modification example of the recessed portion 26 will be described. Fig.10In the main body 12B shown, the recess 110 is defined by a first surface 112 and a second surface 114, wherein the first surface 112 extends radially inward from the coating surface 18, and the second surface 114 extends axially forward from the processing surface 22 and is connected to the first surface 112. The second surface 114 is inclined relative to the processing surface 22 in such a manner that an angle θ1 (<90°) is formed between the second surface 114 and the processing surface 22, thereby the first surface 112 and the second surface 114 are connected to each other in such a manner that an acute angle θ1 is formed.

[0057] according to Fig.10 In the example shown, in step S3, stress can be more effectively concentrated on the curved portion of the coating material 14 formed at the connection portion 115 between the first surface 112 and the second surface 114. Therefore, the coating material 14 can be more effectively prevented from peeling off on the coating surface 18 in step S3.

[0058] for Fig.11 In the main body 12C shown, the recess 116 is defined by a first surface 118 and a second surface 120, wherein the first surface 118 extends radially inward from the coating surface 18, and the second surface 120 extends axially forward from the processing surface 22 and is connected to the first surface 118. The first surface 118 is inclined relative to the coating surface 18 in such a manner that an angle θ2 (<90°) is formed between the first surface 118 and the coating surface 18, and thus, the first surface 118 and the second surface 120 are connected to each other in such a manner that an acute angle θ2 is formed.

[0059] according to Fig.11 The example shown, with Fig.10 Similarly to the example shown, in step S3, stress can be more effectively concentrated on the curved portion of the coating material 14 formed at the connection portion 121 between the first surface 118 and the second surface 120. Therefore, peeling of the coating material 14 on the coating surface 18 can be more effectively prevented.

[0060] In addition, according to Fig.11 In the example shown, the first surface 118 is inclined toward the axial front as it extends radially inward from the coating surface 18, and thus the recess 116 is formed in a manner recessed toward the axial front from the axial rear end 18a of the coating surface 18. With this structure, when the coating material is applied radially inward relative to the coating surface 18 in step S2, the amount of the coating material attached to the first surface 118 can be suppressed, so that the coating material 14 on the coating surface 18 can be made difficult to be peeled off.

[0061] for Fig.12In the main body 12D shown, the recess 122 is defined by a curved surface (e.g., an arc surface). Since the recess 122 can also be used to separate the coating surface 18 and the processing surface 22 from each other in this example, it is possible to make it difficult to peel off the coating material 14 on the coating surface 18 in the above step S3.

[0062] for Fig.13 The main body 12E shown in the figure has a recess 124 formed at the boundary between the coating surface 18 and the processing surface 22, and the recess 124 has a first recess 130 and a second recess 136, and the second recess 136 is arranged between the first recess 130 and the coating surface 18. The first recess 130 is defined by a first surface 126 and a second surface 128. The first surface 126 extends axially forward from the processing surface 22 and is orthogonal to the second surface 128 at its axial front end.

[0063] The second recessed portion 136 is defined by the third surface 132 and the fourth surface 134. The third surface 132 extends radially inward from the coating surface 18 and is perpendicular to the fourth surface 134 at its radial inner end. In addition, the second surface 128 is perpendicular to the fourth surface 134. Fig.13 In the example shown, the painted surface 18 is separated from the processed surface 22 by the recess 124 formed of two recesses 130 and 136 .

[0064] According to this structure, in the above step S3, stress concentration occurs at the first curved portion, the second curved portion, and the third curved portion, and the coating material 14 becomes more easily damaged at the curved portions of the three locations. The first curved portion is a curved portion of the coating material 14 formed at the connection portion 138 between the surface 126 and the surface 128, the second curved portion is a curved portion of the coating material 14 formed at the connection portion 139 between the surface 128 and the surface 134, and the third curved portion is a curved portion of the coating material 14 formed at the connection portion 142 between the surface 132 and the surface 134. Therefore, it is possible to further effectively prevent the coating material 14 from being peeled off on the coating surface 18.

[0065] for Fig.14 The main body 12F shown in the figure has a recess 144 formed at the boundary between the coating surface 18 and the processing surface 22. The recess 144 has a first recess 146 and a second recess 148. The second recess 148 is arranged between the first recess 146 and the coating surface 18. The first recess 146 and the second recess 148 are respectively defined by a curved surface (e.g., an arc surface). Fig.14 In the example shown, in the above-mentioned step S3 , it is possible to make it difficult for the coating material 14 on the coating surface 18 to be peeled off.

[0066] Fig.15The main body 12G shown has an additional recess 150 formed in the main body 12G in a manner recessed radially inward from the second surface 30, in addition to the recess 26 defined by the first surface 28 and the second surface 30. The recess 150 is defined by the first surface 28, the third surface 152, and the fourth surface 154.

[0067] The third surface 152 extends from the radial inner end of the first surface 28 toward the axial rear and is orthogonal to the first surface 28. The fourth surface 154 extends from the axial front end of the second surface 30 toward the radial inner side in a manner facing (specifically, parallel to) the first surface 28 and is orthogonal to the third surface 152 at its radial inner end. The recess 150 can also be formed in a manner extending over the entire area of ​​the boundary between the coating surface 18 and the processing surface 22 (i.e., the entire circumference of the main body 12G) in the same manner as the recess 26. In addition, a plurality of recesses 150 can also be arranged along the recess 26 at a predetermined interval.

[0068] according to Fig.15 In the example shown, when the coating material is applied in the above step S2, the coating material enters the recess 150. Moreover, when a force is applied radially outward by the tool to the coating material 14 on the second surface 30 in the above step S3, the coating material 14 on the second surface 30, and the coating material 14 that has entered the recess 150 and is fixed to the surface 152 and the surface 154 of the recess 150, become more likely to generate stress concentration between the above two coating materials 14 (i.e., the position of the connecting portion 156 connected to the surface 30 and 154). As a result, it is possible to more effectively prevent the coating material 14 from being peeled off and progressing to the coating surface 18. In addition, the recess 150 can also be defined by a curved surface.

[0069] In addition, for Fig. 9 The assembly 140 shown in the figure may also include a sealing material in the recess 26. Fig.16 .for Fig.16 The assembly 140B shown in the figure has an annular sealing material 158 disposed in the recess 26. The sealing material 158 surrounds the axis O ( Figure 1 ) extends in the circumferential direction and seals the gap between the machined surface 22 of the workpiece 10 and the end surface 64 of the workpiece 50. Thus, foreign matter such as cutting fluid can be prevented from entering between the machined surface 22 and the end surface 64.

[0070] The sealing material 158 may also be an annular member that is detachable from the recess 26 and is independent of the workpiece 10 and the workpiece 50. In this case, the sealing material 158 is formed of a flexible material such as rubber, and the manufacturer embeds the sealing material 158 in the recess 26 after connecting the workpiece 10 and the workpiece 50. In addition, the sealing material 158 may also be formed of a filling material filled in the recess 26. In this case, the sealing material 158 is formed of an adhesive, rubber, or a curable resin, and the manufacturer fills the sealing material 158 in the recess 26 after connecting the workpiece 10 and the workpiece 50.

[0071] In addition, the recessed portions 26, 110, 116, 122, 124, 144 and 150 for preventing paint peeling can be formed at the boundary between any processing surface and the painted surface. For example, the outer peripheral surface 68 of the substrate 52 of the workpiece 50 can be used as the painted surface, and the recessed portion can be formed at the boundary between the outer peripheral surface 68 and the end surface 64 of the substrate 52. Such a form is shown in Fig.17 .

[0072] for Fig.17 In the assembly 140C shown, the workpiece 50B has a main body 170 and a coating material 160, the main body 170 having the same shape as the workpiece 50, and the coating material 160 is applied to the coating surface (peripheral surface) 68 of the substrate 52B of the main body 170. In addition, a concave portion 162 is formed at the boundary between the coating surface 68 of the main body 170 and the processing surface (end surface) 64, which is recessed from the coating surface 68 and the processing surface 64 toward the inside of the main body 170. The concave portion 162 is defined by a first surface 164 and a second surface 166, the first surface 164 extending from the axial front end of the coating surface 68 toward the radial inside, and the second surface 166 extending from the radial outer end of the processing surface 64 toward the axial rear and being orthogonal to the first surface 164.

[0073] The workpiece 50B can be Figure 5 Specifically, in step S1, a base material (not shown) of the main body 170 is prepared, and in step S2, the coating material 160 is applied to the coating surface 68 of the main body 170. Next, in step S3, the unprocessed surface of the base material of the main body 170 corresponding to the processed surface 64 is machined to form the processed surface 64.

[0074] In step S3 of manufacturing workpiece 50B, recessed portion 162 can prevent coating material 160 on coating surface 68 from peeling off even if a machine tool applies a force radially outward to the coating material on second surface 166 .

[0075] In addition, the structure of the above-mentioned recessed portion 110, 116, 122, 124, 144, or 150 may also be applied to the recessed portion 162. In addition, for the assembly 140C, a sealing material may be arranged inside the recessed portion 26 and the recessed portion 162, and the gap between the processed surface 22 and the processed surface 64 may be sealed by the sealing material.

[0076] Alternatively, the axially forward end surface 20 of the main body 12 of the workpiece 10 may be machined to form a processed surface 20, and a recess 26, 110, 116, 122, 124, 144, or 150 may be formed at the boundary between the processed surface 20 and the coating surface 18. Alternatively, the processed surface and the coating surface may be parallel to each other.

[0077] In addition, the processed surface and the painted surface may not be perpendicular to each other, but may intersect in an acute angle or an obtuse angle. Fig.18 .for Fig.18 In the workpiece 10B shown, the main body 12H has a coating surface 168, which is arranged adjacent to the processing surface 22 across the boundary. The coating surface 168 has a first surface 168A and a second surface 168B, wherein the first surface 168A is parallel to the axial direction and the second surface 168B is inclined relative to the first surface 168A.

[0078] The concave portion 26 is formed at the boundary between the second surface 168B and the processed surface 22. Fig.18 As can be known, the imaginary extended surface formed by extending the processing surface 22 toward the radial outside and the imaginary extended surface formed by extending the second surface 168B toward the axial rear side intersect in a manner of forming an obtuse angle (i.e., an angle greater than 90°). Similarly, the processing surface 22 can also have a first surface and a second surface, wherein the first surface is parallel to the radial direction and the second surface is inclined relative to the first surface.

[0079] In addition, the features of the various embodiments described above can also be combined. Fig.15 The additional recess 150 shown is formed on at least one of the surfaces defining the recess 110, 116, 122, 124, 144, or 162. In addition, the surface 126, 128, 132, or 134 defining the recess 124 may be inclined in the same manner as the surface 114 of the recess 110 or the surface 118 of the recess 116. In addition, the recess 124 or 144 may be formed so as to have the first to nth (n is an integer greater than or equal to 3) recesses.

[0080] As mentioned above, although this disclosure was demonstrated using embodiment, the said embodiment does not limit the invention concerning a claim.

Claims

1. A workpiece, characterized in that: This artifact has: the main body; and a coating material applied to the main body, The main body has: The machined surface is formed by machining; a coating surface, which is disposed adjacent to the processing surface across a boundary with the processing surface and is coated with the coating material; and a recessed portion formed in the main body portion in a manner recessed from the processed surface and the painted surface toward the inner side of the main body portion at the boundary, and extending along the boundary in a manner separating the processed surface and the painted surface from each other, The recess has: a first recessed portion that is recessed from the processed surface toward the inner side of the main body portion; and The second recessed portion is disposed between the first recessed portion and the painted surface and is recessed from the painted surface toward the inner side of the main body portion.

2. The workpiece according to claim 1, characterized in that The recessed portion is defined by two surfaces, and the two surfaces intersect each other to form a predetermined angle.

3. The workpiece according to claim 2, characterized in that The predetermined angle is less than 90°.

4. The workpiece according to claim 2 or 3, characterized in that The main body portion further includes an additional recessed portion formed so as to be recessed from one of the two surfaces defining the recessed portion toward the inside of the main body portion.

5. The workpiece according to any one of claims 1 to 3, characterized in that The virtual extended surface of the processed surface and the virtual extended surface of the coated surface intersect each other so as to form an angle of 90° or more.

6. A workpiece, characterized in that: This artifact has: the main body; and a coating material applied to the main body, The main body has: The machined surface is formed by machining; a coating surface, which is disposed adjacent to the processing surface across a boundary with the processing surface and is coated with the coating material; and a recessed portion formed in the main body portion in a manner recessed from the processed surface and the painted surface toward the inner side of the main body portion at the boundary, and extending along the boundary in a manner separating the processed surface and the painted surface from each other, The recess is defined by two surfaces, and the two surfaces intersect each other in a manner forming a predetermined angle. The main body portion further includes an additional recessed portion formed so as to be recessed from one of the two surfaces defining the recessed portion toward the inside of the main body portion.

7. A method for manufacturing a workpiece, characterized in that: In the method for manufacturing a workpiece, A substrate is prepared, the substrate having: an unprocessed surface; a coated surface disposed adjacent to the unprocessed surface across a boundary with the unprocessed surface; and a recess formed at the boundary, applying a coating material to the coating surface of the substrate and the surface defining the recessed portion, After the coating material is applied, the unprocessed surface is cut by the tool while the tool is moved toward the surface defining the recessed portion to form a processed surface. When the unprocessed surface is cut, the tool applies force to the end of the coating material applied to the surface defining the recessed portion, thereby causing a portion of the coating material applied to the surface defining the recessed portion to peel off starting from the end.

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