Production method of metallic member

Abstract

To urge heating to be executed more evenly in hardening.SOLUTION: A production method of a metallic member includes radiating beams toward a ridge line part at an outer peripheral surface of a metallic member for hardening. The ridge line part is a portion extending along a ridge line, a cross section of the ridge line part orthogonal to the ridge line has a shape curved so that the outer peripheral surface protrudes, and the ridge line is located at an apex on the cross section. A radiated range where the beam is radiated moves on a radiating path passing through the ridge line part. The radiating path has at least one crossover section crossing over the ridge line. The speed when moving the radiated range becomes slower as a distance between the radiated range and a light source of the beam becomes longer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing a metal component. [Background technology]

[0002] A technique for hardening a workpiece by irradiating the outer surface with a beam is known (for example, Patent Document 1). In the technique of Patent Document 1, a beam is irradiated along a portion of the workpiece that extends like a ridge (hereinafter, referred to as a ridge portion), thereby hardening the workpiece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-176216 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the beam is irradiated, the ridgeline of the workpiece has fewer places for heat to escape than the surrounding area adjacent to the ridgeline, so it is prone to high temperatures, making it difficult to heat the ridgeline and surrounding area uniformly. In particular, when the beam light source is located directly in front of the ridgeline, the ridgeline is prone to excessive heating. This can cause damage such as melting through the ridgeline, and can also make it difficult to heat the surrounding area sufficiently.

[0005] Furthermore, when the beam irradiation area is moved so as to intersect with the ridgeline, the distance between the beam light source and the beam irradiation area may fluctuate, which may result in excessive heating of areas close to the beam light source and insufficient heating of areas far from the beam light source.

[0006] In one aspect of the present disclosure, it is desirable to promote more uniform heating during quenching. [Means for solving the problem]

[0007] One aspect of the present disclosure is a method for manufacturing a metal component, comprising irradiating a beam toward a ridge portion on the outer peripheral surface of the metal component for hardening. The ridge portion is a portion extending along the ridge line, and a cross section of the ridge portion perpendicular to the ridge line has a curved shape such that the outer peripheral surface protrudes, and the ridge line is located at the apex of the cross section. An irradiation region, which is an area irradiated with the beam, moves on an irradiation path that passes through the ridge portion. The irradiation path has at least one intersection section that intersects with the ridge line. The speed at which the irradiation region moves decreases as the distance between the irradiation region and a light source of the beam increases.

[0008] This configuration can prevent excessive heating of the area near the beam light source and insufficient heating of the area far from the beam light source, thereby promoting more uniform heating during hardening.

[0009] One aspect of the present disclosure is a method for manufacturing a metal component, comprising irradiating a beam toward a ridge portion on the outer peripheral surface of the metal component for hardening. The ridge portion is a portion extending along the ridge line, and a cross section of the ridge portion perpendicular to the ridge line has a curved shape such that the outer peripheral surface protrudes, and the ridge line is located at the apex of the cross section. An irradiation region, which is an area irradiated with the beam, moves on an irradiation path that passes through the ridge line. The irradiation path has at least one intersection section that intersects with the ridge line. The speed at which the irradiation region moves decreases as the distance between the ridge line and the irradiation region increases.

[0010] According to the above configuration, it is possible to prevent the portion near the ridge line from being overheated and the portion away from the ridge line from being insufficiently heated, thereby promoting more uniform heating during hardening.

[0011] In one embodiment of the present disclosure, the illumination path may have at least one first intersecting section and at least one second intersecting section. The first intersecting section is an intersecting section. The second intersecting section is an intersecting section. The first and second intersecting sections may be arranged alternately from the start point of the illumination path toward the end point. The first intersecting section may have a first starting end located on the right side of the ridgeline and a first ending end located on the left side of the ridgeline, and the second intersecting section may have a second starting end located on the left side of the ridgeline and a second ending end located on the right side of the ridgeline. The illumination area may move from the first starting end to the first ending end of the first intersecting section and from the second starting end to the second ending end of the second intersecting section. Furthermore, when the illumination area reaches the first ending end of the first intersecting section, it may move to the second starting end of the second intersecting section adjacent to the ending end of the first intersecting section, and when it reaches the second ending end of the second intersecting section, it may move to the first starting end of the first intersecting section adjacent to the ending end of the second intersecting section.

[0012] According to the above configuration, it is possible to promote more uniform heating during quenching. In one aspect of the present disclosure, the area through which the illumination area passes may be defined as the passing area. The distance between the adjacent first and second intersection sections and the size of the illumination area may be adjusted so that the passing area formed by the illumination area passing through the first intersection section overlaps with the passing area formed by the illumination area passing through the second intersection section adjacent to the first intersection section.

[0013] According to the above configuration, the metal member can be heated more reliably during quenching. In one aspect of the present disclosure, the irradiation area may move over the crossing section by changing the irradiation direction of the beam using a mirror.

[0014] According to the above configuration, the beam can be irradiated more suitably along the crossing section. In one aspect of the present disclosure, the ridge portion may be located on a plate-like portion of the metal member. The crossing section may be provided so as to cross a portion of the plate-like portion that forms the effective width.

[0015] According to the above configuration, the portion of the plate-shaped portion that defines the effective width can be uniformly heated, thereby enabling quenching to be performed while suppressing damage. In one aspect of the present disclosure, the metal member is a press-formed member and may be used in a vehicle body.

[0016] According to the above configuration, it is possible to promote more uniform heating during quenching. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a perspective view of a metal member according to the first embodiment. [Figure 2] 3 is an explanatory diagram of the irradiation of a beam from a laser head to a metal member in the first embodiment, as viewed in the direction of a ridge line. FIG. [Figure 3] 4 is an explanatory diagram of irradiation of a beam from a laser head to a metal member in the first embodiment, as viewed from the first side surface portion side. FIG. [Figure 4] FIG. 2 is an explanatory diagram of an irradiation area and an irradiation path in the first embodiment. [Figure 5] 3A and 3B are explanatory diagrams of an irradiation area, an irradiation path, and a passing area in the first embodiment. [Figure 6] FIG. 10 is an explanatory diagram of an irradiation area and an irradiation path in the second embodiment. [Figure 7] 10 is an explanatory diagram of the irradiation of a beam from a laser head to a metal member in the second embodiment, as viewed in the direction of a ridge line. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First embodiment] [(1) Overview] The manufacturing method of the metal member 1 (see FIG. 1) in the first embodiment includes a step of quenching the metal member 1 using a beam. The metal member 1 is a plate-shaped member made of metal (iron, for example). As an example, the material making up the metal member 1 may be high-tensile steel, more specifically, high-tensile steel having a tensile strength of 590 MPa or more. Furthermore, as an example, the metal member 1 is used as part of a vehicle, more specifically, as part of the body of the vehicle. Of course, the present invention is not limited to this, and the metal member 1 may also be a member that is not mounted on a vehicle.

[0019] The metal member 1 is a groove-shaped member extending along the extension direction E, and includes a top portion 10, a first side portion 11, a first flange portion 11A, a second side portion 12, and a second flange portion 12A (see Figures 1 and 2).

[0020] The top portion 10 is a long, narrow plate-like portion extending in a plane in the stretching direction E, and a step portion 10A extending in the stretching direction E is formed in the center of the top portion 10 in the width direction. The first and second side portions 11, 12 are plate-shaped portions that protrude from both ends of the top portion 10 in the width direction and face each other in the width direction of the top portion 10. The first and second side portions 11, 12 each extend from a first end to a second end of the top portion 10 in the extension direction E.

[0021] The first and second flange portions 11A, 12A are flange-shaped portions provided at the ends of the first and second side surface portions 11, 12 opposite the top portion 10. The first and second flange portions 11A, 12A extend from a first end to a second end in the extension direction E of the first and second side surface portions 11, 12, respectively.

[0022] That is, the first and second side portions 11, 12 form an opening in the metal member 1, which is a groove-shaped member, and the first and second flange portions 11A, 12A are arranged on both sides of the opening. The top portion 10 and the first and second side portions 11, 12 on the opposite sides of the opening form the outer peripheral surface 13 of the metal member 1.

[0023] [(2) Ridge and surrounding areas] At the boundary between the top portion 10 and the first side surface portion 11, a ridge portion 2 is formed, which extends straight along the ridge line 20 (see FIGS. 1 and 2). The ridge line 20 extends straight along the extension direction E and is included in the ridge portion 2. The ridge portion 2 and the ridge line 20 extend from the first end to the second end of the metal member 1.

[0024] A cross section of the ridge portion 2 perpendicular to the ridge line 20 (hereinafter simply referred to as a cross section) has a curved shape so that the outer peripheral surface 13 of the metal member 1 protrudes. In the first embodiment, as an example, the entire cross section of the ridge portion 2 has a curved shape (see FIG. 2). However, this is not limiting, and the cross section of the ridge portion 2 may have a curved portion and a portion that extends in a plane, or may have a bent shape. The ridge line 20 is located at the apex of the cross section.

[0025] Furthermore, the length of the ridgeline portion 2 in the ridgeline width direction W, which is a direction along the outer peripheral surface 13 and perpendicular to the extension direction E, is approximately equal to the effective Karman width be of the metal member 1. The effective width be is calculated, for example, by the following formula.

[0026]

number

[0027] Here, E is the Young's modulus of the metal constituting the metal member 1, k is the constraint coefficient, ν is the Poisson's ratio, and σ y is the yield point (MPa), and t is the thickness (mm) of the metal member 1. Of course, the length of the ridge line width direction W of the ridge line portion 2 is not limited to the effective width be, and can be determined appropriately.

[0028] The portion of the top portion 10 adjacent to the ridge line portion 2 and the portion of the first side surface portion 11 adjacent to the ridge line portion 2 are referred to as the peripheral portion 3. In other words, the peripheral portion 3 has two portions located on both the left and right sides of the ridge line portion 2. The cross section of the peripheral portion 3 extends in a plane. The peripheral portion 3 also extends from the first end to the second end of the metal member 1.

[0029] [(3) Method for manufacturing metal components] The method for manufacturing the metal member 1 includes a step of forming the metal member 1 by press molding, and a quenching step (see FIGS. 2 to 5) of quenching the metal member 1. Note that the metal member 1 may be formed by a method other than press molding.

[0030] In the hardening process, a beam B is irradiated toward a hardening region 4 located at the portion of the outer surface 13 of the metal member 1 where the ridge portion 2 and the peripheral portion 3 are located, and the hardening region 4 is heated, for example, to approximately 900°C.

[0031] The position, shape, and size of the hardening region 4 may be determined as appropriate. As an example, the hardening region 4 extends to the ridge line portion 2 and the peripheral portions 3 on both the left and right sides of the ridge line portion 2. However, this is not limiting, and the hardening region 4 may be provided on the ridge line portion 2, or on the ridge line portion 2 and the peripheral portion 3 on one side. The hardening region 4 extends in a strip shape in the direction of the ridge line 20, has a substantially constant width, and the ridge line 20 is located approximately in the center in the width direction. Both ends of the hardening region 4 in the ridge line width direction W extend linearly along the ridge line 20. After irradiation of the hardening region 4 with the beam B is completed, the beam may be further irradiated onto regions of the outer circumferential surface 13 other than the hardening region 4.

[0032] After the heating of the metal member 1 by the beam is completed, the metal member 1 is rapidly cooled, for example, to about 200°C within a short period of time. As a result, martensitic transformation occurs in the hardened region 4 of the metal member 1, and the hardness of the hardened region 4 is improved.

[0033] [(4) Irradiation route] In the hardening process, a beam B is irradiated along an irradiation path 5 set in the hardening region 4 (see FIG. 4). The irradiation path 5 is arranged throughout the hardening region 4 and has a plurality of first intersecting sections 51, a plurality of second intersecting sections 52, and a plurality of connecting sections 53.

[0034] The first and second intersection sections 51, 52 (hereinafter simply referred to as intersection sections) are sections that intersect with the ridge line 20 and are arranged alternately from the start point 5S to the end point 5E. As an example, each intersection section extends linearly so as to intersect with the ridge line 20 at approximately 90°. Each intersection section has approximately the same length, and each end of the intersection section is located in the peripheral portion 3 on both the left and right sides of the ridge line portion 2 and near the end of the hardening region 4. In other words, each intersection section crosses the portion that forms the effective width be, and both ends of the intersection section are located in portions different from the portion that forms the effective width be. Each intersection section is arranged approximately parallel to the ridge line 20 at approximately regular intervals (hereinafter referred to as the pitch P) from the start point 5S to the end point 5E of the irradiation path 5.

[0035] However, the present invention is not limited to this, and the angle at which each intersecting section intersects with the ridge line 20, the length of each intersecting section, the shape of each intersecting section, the position of each intersecting section, or the pitch P can be determined appropriately depending on, for example, the shape of the metal member 1 (more specifically, the ridge line portion 2) or the shape of the hardening region 4. Furthermore, the irradiation path 5 may have one first intersecting section 51 and one second intersecting section 52. Furthermore, the end of each intersecting section may be located on the right or left side of the ridge line 20 in the ridge line portion 2, rather than in the peripheral portion 3.

[0036] The first intersecting section 51 has a first starting point 51S, which is an end located on the right side of the ridge line 20, and a first ending point 51E, which is an end located on the left side of the ridge line 20. The second intersecting section 52 has a second starting point 52S, which is an end located on the left side of the ridge line 20, and a second ending point 52E, which is an end located on the right side of the ridge line 20.

[0037] Furthermore, on the left side of the ridge line 20, a first terminal end 51E of the first intersecting section 51 and a second starting end 52S of the second intersecting section 52 adjacent to the end point 5E of the first intersecting section 51 are connected by a connecting section 53. Furthermore, on the right side of the ridge line 20, a second terminal end 52E of the second intersecting section 52 and a first starting end 51S of the first intersecting section 51 adjacent to the end point 5E of the second intersecting section 52 are connected by a connecting section 53.

[0038] Also, as an example, a first starting end 51S of the first intersecting section 51 is located at the starting point 5S of the irradiation path 5. However, this is not a limitation, and a second starting end 52S of the second intersecting section 52 may be located at the starting point 5S. Also, as an example, a second ending end 52E of the second intersecting section 52 is located at the ending point 5E of the irradiation path 5. However, this is not a limitation, and a first ending end 51E of the first intersecting section 51 may be located at the ending point 5E.

[0039] [(5) Beam irradiation] In the hardening process, a beam B is irradiated from a laser head 6 of a laser device toward an irradiation path 5 of the hardening region 4 (see FIGS. 2 and 3). Then, the irradiation direction of the beam B and the relative position between the light source of the beam B and the metal member 1 are adjusted so that an irradiation region 50, which is the region irradiated with the beam B, moves on the irradiation path 5 from a start point 5S of the irradiation path 5 to an end point 5E of the irradiation path 5 (see FIG. 4). As an example, the irradiation region 50 is circular, and the center of the irradiation region 50 passes through the irradiation path 5. However, the shape of the irradiation region 50 is not limited to this and can be determined as appropriate.

[0040] Specifically, when the irradiation area 50 moves on the intersection section, the irradiation direction of the beam B is changed by adjusting the orientation of the galvanometer mirror 60 provided in the laser head 6. As a result, the irradiation area 50 moves on the first intersection section 51 from a first starting point 51S to a first ending point 51E, and also moves on the second intersection section 52 from a second starting point 52S to a second ending point 52E.

[0041] Furthermore, when the irradiation area 50 moves on the connection section 53, the laser head 6 and / or the metal member 1 are moved in the direction of the ridge line 20. As a result, the irradiation area 50 moves on the connection section 53 from the first terminal end 51E of the first intersecting section 51 to the second starting end 52S of the second intersecting section 52, and also moves on the connection section 53 from the second terminal end 52E of the second intersecting section 52 to the first starting end 51S of the first intersecting section 51.

[0042] Of course, the present invention is not limited to this, and the irradiation area 50 may be moved on the intersection section by moving the laser head 6 configured as a galvanometer head and / or the metal member 1. Furthermore, the irradiation area 50 may be moved on the connection section 53 by changing the irradiation direction of the beam B using the galvanometer mirror 60.

[0043] Furthermore, the pitch P and the size of the irradiation region 50 (for example, the diameter of the irradiation region 50) are set so that a passing region 54 formed when the irradiation region 50 passes through the first intersection section 51 overlaps with a passing region 54 formed when the irradiation region 50 passes through the second intersection section 52 (see FIG. 5). Note that the passing region 54 refers to the region through which the irradiation region 50 passes. For example, the pitch P may be 0.05 mm or more and 0.15 mm or less, and the diameter of the irradiation region 50 may be approximately 5 mm or more.

[0044] [(6) Speed of movement of the irradiation area] For example, the laser head 6 is disposed so that the light source of the beam B is located in front of the ridge line 20 of the metal member 1 (see FIG. 2). More specifically, for example, the laser head 6 may be disposed so that the light source of the beam B is closest to the ridge line 20.

[0045] Furthermore, the speed at which the irradiation direction of the beam B changes and the moving speed of the laser head 6 and / or the metal member 1 are adjusted so that the moving speed of the irradiation area 50 when it moves on the irradiation path 5 becomes slower as the ridge line distance D0 (see FIG. 4) becomes longer. Note that the ridge line distance D0 means the distance between the ridge line 20 and the irradiation area 50.

[0046] Furthermore, the speed at which the irradiation direction of the beam B changes and the moving speed of the laser head 6 and / or the metal member 1 are adjusted so that the moving speed of the irradiation area 50 when moving on the irradiation path 5 becomes slower as the light source distance D1 (see FIGS. 2 and 3) becomes longer. Note that the light source distance D1 means the distance between the light source of the beam B in the laser head 6 and the irradiation area 50.

[0047] In the first embodiment, as an example, two stages of movement speed are provided. That is, the hardening region 4 is provided with a high-speed region 40 and two low-speed regions 41. The high-speed region 40 includes the ridge line 20, extends along the ridge line 20 from a first end to a second end of the hardening region 4, has a substantially constant width, and the ridge line 20 is located at substantially the center in the width direction. Furthermore, each low-speed region 41 is located on both the left and right sides of the high-speed region 40, and extends from the first end to the second end of the hardening region 4. Furthermore, each low-speed region 41 extends to the end of the hardening region 4 in the direction of the intersection section, and the width of each low-speed region 41 is substantially the same.

[0048] That is, when the irradiation area 50 moves through the irradiation path 5 located in the low speed region 41, the distance between the irradiation area 50 and the ridge line 20 and the light source of the beam B is longer than when the irradiation area 50 moves through the irradiation path 5 located in the high speed region 40. The movement speed of the irradiation area 50 when passing through the high speed region 40 is faster than the movement speed of the irradiation area 50 when passing through the low speed region 41. As an example, the movement speed of the irradiation area 50 in the high speed region 40 is 8000 mm / s, and the movement speed of the irradiation area 50 in the low speed region 41 is 4000 mm / s.

[0049] Of course, the present invention is not limited to this, and for example, N (an integer of 3 or more) stages of movement speed may be provided, and similarly, a high-speed region including the ridge line 20 may be provided, and N-1 low-speed regions may be provided on both sides of the high-speed region. The movement speed of the irradiation region 50 when passing through each low-speed region may be determined in advance, so that the further the low-speed region is from the light source of the beam B or the ridge line 20 (in other words, the high-speed region), the slower the movement speed of the irradiation region 50.

[0050] Also, for example, without providing high speed and low speed regions, the movement speed of the illumination area 50 may be gradually slowed as the light source distance D1 increases, or the movement speed of the illumination area 50 may be gradually slowed as the ridge distance D0 increases.

[0051] [2. Second Embodiment] The method for manufacturing the metal member 1 in the second embodiment differs from that in the first embodiment in the shape of the irradiation region 50 (see FIG. 6). Below, the differences between the method for manufacturing the metal member 1 in the second embodiment and that in the first embodiment will be described.

[0052] The irradiation area 50 in the second embodiment has an elongated shape extending in the direction of the ridge line 20. As an example, the irradiation area 50 is substantially elliptical, but is not limited thereto and may be, for example, substantially rectangular. Furthermore, the irradiation area 50 extends from a first end to a second end in the direction of the ridge line 20 of the hardening area 4.

[0053] Furthermore, in the second embodiment, an irradiation path 5 is also set in the hardening region 4, but the irradiation path 5 in the second embodiment is composed of only one first intersecting section 51. The first intersecting section 51 is provided approximately in the center of the hardening region 4 in the direction of the ridge line 20, and is configured in the same manner as in the first embodiment. That is, as an example, the first intersecting section 51 extends linearly so as to intersect with the ridge line 20 at approximately 90°, and a first starting point 51S and a first ending point 51E, which correspond to a starting point 5S and an ending point 5E of the irradiation path 5, are located near the ends of the hardening region 4.

[0054] Then, in the hardening process, the irradiation region 50 moves on the irradiation path 5 from the first starting point 51S to the first ending point 51E of the first intersection section 51, so that the beam B is irradiated onto the entire hardening region 4. At this time, as in the first embodiment, the moving speed of the irradiation region 50 slows as the ridge line distance D0 increases, and the moving speed of the irradiation region 50 slows as the light source distance D1 increases. Specifically, for example, as in the first embodiment, a high-speed region and a low-speed region may be provided, and the irradiation region 50 may be moved at a moving speed corresponding to each region.

[0055] Furthermore, when the irradiation area 50 moves on the irradiation path 5, the irradiation area 50 extends in a direction perpendicular to the first intersection section 51. As an example, the irradiation area 50 may be moved by moving the laser head 6 and / or the metal member 1 (see FIG. 7). Of course, this is not limiting, and the irradiation area 50 may be moved by, for example, changing the irradiation direction of the beam B using the galvanometer mirror 60.

[0056] The irradiation path 5 may have a plurality of (for example, several) intersecting sections and a connecting section similar to that in the first embodiment. Then, similar to the first embodiment, the beam B may be irradiated so that the irradiation area 50 moves on the irradiation path 5. In this case, when the irradiation area 50 passes through the intersecting section, the irradiation area 50 extends in a direction perpendicular to the intersecting section, and when the irradiation area 50 passes through the connecting section, the irradiation area 50 extends in the direction of the connecting section.

[0057] [3.Effects] (1) According to the first and second embodiments, the longer the light source distance D1, the slower the moving speed of the irradiation region 50. This makes it possible to prevent excessive heating of a portion near the light source of the beam B and insufficient heating of a portion distant from the light source of the beam B. Furthermore, the longer the ridge line distance D1, the slower the moving speed of the irradiation region 50. This makes it possible to prevent excessive heating of a portion near the ridge line 20 and insufficient heating of a portion distant from the ridge line 20. This makes it possible to promote more uniform heating during hardening, thereby making it possible to prevent damage to the metal member 1, such as burn-through.

[0058] Furthermore, ultra-high tensile steel with a tensile strength of 1470 MPa or more is difficult to press-form. In contrast, according to the first and second embodiments, partial quenching can be suitably performed. Therefore, by forming a member by press-forming high tensile steel with low tensile strength and then performing the quenching according to the first and second embodiments, the hardness of the member can be appropriately improved. Therefore, it is possible to manufacture a member having properties similar to those of a member made of ultra-high tensile steel without using ultra-high tensile steel, thereby reducing costs.

[0059] (2) Furthermore, according to the first embodiment, the irradiation path 5 has a plurality of intersecting sections 51, 52 that intersect with the ridge line 20. This can encourage more uniform heating during hardening.

[0060] (3) Furthermore, according to the first embodiment, the pitch P and the size of the irradiation area 50 are adjusted so that the passing areas 54 formed in the first and second intersection sections 51, 52 overlap each other. This allows the hardening area 4 to be heated more reliably.

[0061] (4) Furthermore, by changing the irradiation direction of the beam B using the galvanometer mirror 60, the irradiation area 50 moves over the intersecting sections 51 and 52. This allows the beam B to be irradiated along the intersecting sections 51 and 52 more suitably.

[0062] (5) Furthermore, each of the intersecting sections 51, 52 crosses the portion that forms the effective width be. This allows the portion that forms the effective width be to be heated uniformly, thereby enabling hardening to be performed while suppressing damage.

[0063] 4. Other Embodiments (1) The metal member 1 of the first and second embodiments is entirely composed of a plate-like portion. However, this is not limiting, and in a method for manufacturing a metal member in which a plate-like portion is partially provided, a quenching process may be performed on the ridge line portion and peripheral portion of the plate-like portion, as in the first and second embodiments. Furthermore, a quenching process similar to the first and second embodiments may be performed on the ridge line portion and peripheral portion formed in a non-plate-like portion of the metal member.

[0064] (2) In the first and second embodiments, the ridge portion 2 and the ridge line 20 extend linearly. However, this is not limiting, and hardening may be performed by irradiating the beam B in a similar manner to a hardening region provided on the ridge portion 2 and the ridge line 20 that have a curved shape.

[0065] Specifically, when setting an irradiation path having multiple intersecting sections as in the first embodiment, the irradiation path may be arranged over the entire hardening region by arranging the intersecting sections approximately parallel to each other, as in the first embodiment. In this case, the angle at which each intersecting section intersects with the ridge line is not limited to approximately 90° and can be determined appropriately depending on the shape of the ridge line. Of course, unlike the first embodiment, the orientation of each intersecting section may be individually determined depending on the shape of the ridge line, so that the irradiation path may be arranged over the entire hardening region. In this case, not all intersecting sections are necessarily approximately parallel, and the angle at which each intersecting section intersects with the ridge line is not limited to approximately 90° and can be determined appropriately.

[0066] Furthermore, even when irradiating a beam B having an elongated irradiation area as in the second embodiment, the shape of the irradiation area and the intersection section may be determined according to the shape of the ridge line 20 so that the beam B is irradiated over the entire hardening area.

[0067] (3) In the first and second embodiments, the laser head 6 is disposed so that the light source of the beam B is located directly in front of the ridge line 20 of the metal member 1. However, this is not limiting, and the position of the laser head 6 can be determined as appropriate. Even if the light source of the beam B is located other than directly in front of the ridge line 20 of the metal member 1, the moving speed of the irradiation area 50 may be slowed as the ridge line distance D0 increases, or the moving speed of the irradiation area 50 may be slowed as the light source distance D1 increases.

[0068] (4) Multiple functions of one component in the above embodiments may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0069] [5. Technical Ideas Disclosed in the Present Specification] [Item 1] A method for manufacturing a metal member, comprising: irradiating a beam toward a ridge portion on an outer peripheral surface of the metal member for hardening; the ridge portion is a portion extending along a ridge line, a cross section of the ridge portion perpendicular to the ridge line has a curved shape such that the outer circumferential surface protrudes, and the ridge line is located at a peak in the cross section, an irradiation area, which is an area irradiated with the beam, moves on an irradiation path that passes through the ridgeline portion; the illumination path has at least one crossing section that crosses the ridge line; The longer the distance between the illuminated area and the light source of the beam, the slower the speed at which the illuminated area moves. A method for manufacturing a metal component.

[0070] [Item 2] A method for manufacturing a metal member, comprising: irradiating a beam toward a ridge portion on an outer peripheral surface of the metal member for hardening; the ridge portion is a portion extending along a ridge line, a cross section of the ridge portion perpendicular to the ridge line has a curved shape such that the outer circumferential surface protrudes, and the ridge line is located at a peak in the cross section, an irradiation area, which is an area irradiated with the beam, moves on an irradiation path that passes through the ridgeline portion; the illumination path has at least one crossing section that crosses the ridge line; As the distance between the ridgeline and the illumination area increases, the speed at which the illumination area moves decreases. A method for manufacturing a metal component.

[0071] [Item 3] Item 1 or Item 2, a method for producing a metal member, the illumination path has at least one first intersecting section that is the intersecting section and at least one second intersecting section that is the intersecting section; the first and second intersection sections are alternately arranged from the start point to the end point of the irradiation path, the first intersecting section has a first starting point which is an end located on the right side of the ridge line and a first ending point which is an end located on the left side of the ridge line, the second intersecting section has a second starting point which is an end located on the left side of the ridge line and a second ending point which is an end located on the right side of the ridge line, The illumination area moves from the first starting end to the first ending end of the first intersecting section, and also moves from the second starting end to the second ending end of the second intersecting section. When the illumination area reaches the first ending end of the first intersecting section, it moves to the second starting end of the second intersecting section adjacent to the ending point side of the first intersecting section. When the illumination area reaches the second ending end of the second intersecting section, it moves to the first starting end of the first intersecting section adjacent to the ending point side of the second intersecting section. A method for manufacturing a metal component.

[0072] [Item 4] Item 3. A method for producing a metal member according to item 3, The area through which the irradiation area passes is defined as a passing area, The distance between the adjacent first and second intersection sections and the size of the illumination area are adjusted so that the passing area formed by the illumination area passing through the first intersection section overlaps with the passing area formed by the illumination area passing through the second intersection section adjacent to the first intersection section. A method for manufacturing a metal component.

[0073] [Item 5] Item 4: A method for producing a metal member according to any one of items 1 to 4, By changing the irradiation direction of the beam using a mirror, the irradiation area moves on the crossing section. A method for manufacturing a metal component.

[0074] [Item 6] Item 6. A method for producing a metal member according to any one of items 1 to 5, the ridge portion is located on a plate-like portion of the metal member, The crossing section is provided so as to cross a portion of the plate-like portion that forms an effective width. A method for manufacturing a metal component.

[0075] [Item 7] Item 6. A method for producing a metal member according to any one of items 1 to 6, The metal member is a press-formed member used in the body of a vehicle. A method for manufacturing a metal component. [Explanation of symbols]

[0076] B...beam, W...ridge width direction, E...extension direction, P...pitch, D0...ridge distance, D1...light source distance, 1...metal member, 10...top, 11...first side portion, 13...outer surface, 2...ridge portion, 20...ridge, 3...periphery, 4...hardening region, 40...high-speed region, 41...low-speed region, 5...irradiation path, 5S...starting point, 5E...end point, 50...irradiation region, 51...first intersection section, 51S...first starting end, 51E...first terminal end, 52...second intersection section, 52S...second starting end, 52E...second terminal end, 53...connection section, 54...passing region, 6...laser head, 60...galvanometer mirror.

Claims

1. A method for manufacturing a metal member, comprising: irradiating a beam toward a ridge portion on an outer peripheral surface of the metal member for hardening; the ridge portion is a portion extending along a ridge line, a cross section of the ridge portion perpendicular to the ridge line has a curved shape such that the outer circumferential surface protrudes, and the ridge line is located at a peak in the cross section, an irradiation area, which is an area irradiated with the beam, moves on an irradiation path that passes through the ridgeline portion; the illumination path has at least one crossing section that crosses the ridge line; The longer the distance between the illuminated area and the light source of the beam, the slower the speed at which the illuminated area moves. A method for manufacturing a metal component.

2. A method for manufacturing a metal member, comprising: irradiating a beam toward a ridge portion on an outer peripheral surface of the metal member for hardening; the ridge portion is a portion extending along a ridge line, a cross section of the ridge portion perpendicular to the ridge line has a curved shape such that the outer circumferential surface protrudes, and the ridge line is located at a peak in the cross section, an irradiation area, which is an area irradiated with the beam, moves on an irradiation path that passes through the ridgeline portion; the illumination path has at least one crossing section that crosses the ridge line; As the distance between the ridgeline and the illumination area increases, the speed at which the illumination area moves decreases. A method for manufacturing a metal component.

3. The method for manufacturing a metal member according to claim 1 or 2, The illumination path has at least one first intersecting section that is the intersecting section and at least one second intersecting section that is the intersecting section; the first and second intersection sections are alternately arranged from the start point to the end point of the irradiation path, the first intersecting section has a first starting point which is an end located on the right side of the ridge line and a first ending point which is an end located on the left side of the ridge line, the second intersecting section has a second starting point which is an end located on the left side of the ridge line and a second ending point which is an end located on the right side of the ridge line, The illumination area moves from the first starting end to the first ending end of the first intersecting section, and also moves from the second starting end to the second ending end of the second intersecting section. When the illumination area reaches the first ending end of the first intersecting section, it moves to the second starting end of the second intersecting section adjacent to the ending point side of the first intersecting section. When the illumination area reaches the second ending end of the second intersecting section, it moves to the first starting end of the first intersecting section adjacent to the ending point side of the second intersecting section. A method for manufacturing a metal component.

4. The method for manufacturing a metal member according to claim 3, The area through which the irradiation area passes is defined as a passing area, The distance between the adjacent first and second intersection sections and the size of the illumination area are adjusted so that the passing area formed by the illumination area passing through the first intersection section overlaps with the passing area formed by the illumination area passing through the second intersection section adjacent to the first intersection section. A method for manufacturing a metal component.

5. The method for manufacturing a metal member according to claim 1 or 2, By changing the irradiation direction of the beam using a mirror, the irradiation area moves on the crossing section. A method for manufacturing a metal component.

6. The method for manufacturing a metal member according to claim 1 or 2, the ridge portion is located on a plate-like portion of the metal member, The crossing section is provided so as to cross a portion of the plate-like portion that forms an effective width. A method for manufacturing a metal component.

7. The method for manufacturing a metal member according to claim 1 or 2, The metal member is a press-formed member used in the body of a vehicle. A method for manufacturing a metal component.

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