Manufacturing method for metal components

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] This disclosure relates to a method for manufacturing a metal member.

Background Art

[0002] There is known a technique of performing quenching by irradiating a beam toward the outer surface of a workpiece (for example, Patent Document 1). In the technique of Patent Document 1, a beam is irradiated along a portion extending in a ridge line shape in the workpiece (hereinafter referred to as a ridge line portion), and quenching is thereby performed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when irradiating the beam, the ridge line portion of the workpiece has less heat dissipation space than the peripheral portion adjacent to the ridge line portion, so it tends to become high temperature, and it is difficult to uniformly heat the ridge line portion and the peripheral portion. In particular, when the light source of the beam is located in front of the ridge line portion, the ridge line portion is likely to be overheated. For this reason, in the ridge line portion, there is a risk of damage such as melting and falling, and there is also a risk that the peripheral portion cannot be sufficiently heated.

[0005] Further, when moving the irradiation area of the beam so as to intersect the ridge line portion, the distance between the light source of the beam and the irradiation area of the beam may vary. For this reason, there is a risk that a portion close to the light source of the beam is overheated or a portion far from the light source of the beam cannot be sufficiently heated.

[0006] In one aspect of this disclosure, it is desirable to promote more uniform heating during quenching.

Means for Solving the Problems

[0007] One aspect of the present disclosure is a method for manufacturing a metal member, comprising irradiating a beam toward a ridge on the outer surface of the metal member for quenching. The ridge is a portion extending along a ridge, and the cross section perpendicular to the ridge of the ridge has a curved shape such that the outer surface protrudes, with the ridge located at the top of the cross section. The irradiation region, which is the area irradiated by the beam, moves along an irradiation path that passes through the ridge. The irradiation path has at least one intersection section that intersects with the ridge. As the distance between the irradiation region and the beam source increases, the speed at which the irradiation region moves slows down.

[0008] The above configuration prevents excessive heating of the beam near the light source and insufficient heating of the beam further away from the light source. This promotes more uniform heating during quenching.

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

[0010] The above configuration prevents excessive heating near the ridges and insufficient heating in areas away from the ridges. This promotes more uniform heating during the hardening process.

[0011] In one aspect of this disclosure, the irradiation path may have at least one first crossing section and at least one second crossing section. The first crossing section is a crossing section. The second crossing section is a crossing section. The first and second crossing sections may be arranged alternately from the start to the end of the irradiation path. The first crossing section may have a first start end, which is the end located to the right of the ridge, and a first end end, which is the end located to the left of the ridge, and the second crossing section may have a second start end, which is the end located to the left of the ridge, and a second end end, which is the end located to the right of the ridge. The irradiation area may move from the first start end to the first end of the first crossing section and from the second start end to the second end of the second crossing section. Furthermore, when the irradiation area reaches the first end of the first crossing section, it may move to the second start end of the second crossing section adjacent to the end end of the first crossing section, and when it reaches the second end of the second crossing section, it may move to the first start end of the first crossing section adjacent to the end end of the second crossing section.

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

[0013] According to the above configuration, metal components can be heated more reliably during the quenching process. In one aspect of this disclosure, the irradiation area may move along the intersection section by changing the direction of the beam irradiation using a mirror.

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

[0015] According to the above configuration, it is possible to promote uniform heating of the portion forming the effective width in the plate-like portion. Therefore, quenching can be performed while suppressing damage. In one aspect of the present disclosure, the metal member is a press-formed member and may be used for a vehicle body.

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

Brief Description of the Drawings

[0017] [Figure 1] It is a perspective view of the metal member of the first embodiment. [Figure 2] It is an explanatory view when the irradiation of the beam from the laser head to the metal member in the first embodiment is viewed in the direction of the ridge line. [Figure 3] It is an explanatory view when the irradiation of the beam from the laser head to the metal member in the first embodiment is viewed from the first side surface side. [Figure 4] It is an explanatory view of the irradiation region and the irradiation path in the first embodiment. [Figure 5] It is an explanatory view of the irradiation region, the irradiation path, and the passing region in the first embodiment. [Figure 6] It is an explanatory view of the irradiation region and the irradiation path in the second embodiment. [Figure 7] It is an explanatory view when the irradiation of the beam from the laser head to the metal member in the second embodiment is viewed in the direction of the ridge line.

Modes for Carrying Out 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 with a beam. The metal member 1 is a plate-shaped member made of metal (for example, iron). As an example, the material constituting the metal member 1 may be high-tensile steel, and more specifically, high-tensile steel having a tensile strength of 590 MPa or more may be used. Also, as an example, the metal member 1 is used as a part of a vehicle, and more specifically, as a part of the vehicle body. Of course, it is not limited to this, and the metal member 1 may be a member not mounted on the vehicle.

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

[0020] The top portion 10 is an elongated plate-shaped portion extending in a planar manner along the stretching direction E, and a step portion 10A extending in the stretching direction E is formed at the center in the width direction of the top portion 10. The first and second side surface portions 11 and 12 are plate-shaped portions protruding from both ends in the width direction of the top portion 10, and face each other in the width direction of the top portion 10. The first and second side surface portions 11 and 12 each extend from the first end to the second end in the stretching direction E of the top portion 10.

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

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

[0023] [(2) Ridge line portion and peripheral portion] A ridge section 2 is formed at the boundary between the top portion 10 and the first side portion 11, extending straight along the ridge line 20 (see Figures 1 and 2). The ridge line 20 extends straight along the extension direction E and is included in the ridge section 2. Furthermore, the ridge section 2 and the ridge line 20 extend from the first end to the second end of the metal member 1.

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

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

[0026]

number

[0027] Note that E is the Young's modulus of the metal constituting metal member 1, k is the constraint coefficient, ν is 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 W in the ridge width direction of the ridge section 2 is not limited to the effective width be, but can be determined as appropriate.

[0028] Furthermore, the portion adjacent to the ridge line portion 2 on the top portion 10 and the portion adjacent to the ridge line portion 2 on the first side portion 11 are defined as the peripheral portion 3. In other words, the peripheral portion 3 has two parts located on both the left and right sides of the ridge line portion 2. The cross-section of the peripheral portion 3 spreads out in a planar manner. 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 manufacturing method for the metal member 1 includes a step of forming the metal member 1 by press forming and a quenching step of hardening the metal member 1 (see Figures 2-5). The metal member 1 may also be formed by methods other than press forming.

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

[0031] The position, shape, and size of the hardening region 4 can be determined as appropriate. For example, the hardening region 4 extends from the ridge line 2 to the peripheral areas 3 on both the left and right sides of the ridge line 2. However, it is not limited to this, and the hardening region 4 may be provided on the ridge line 2, or on the ridge line 2 and one of the peripheral areas 3. Furthermore, the hardening region 4 extends in a band 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. In addition, both ends of the hardening region 4 in the ridge line width direction W extend linearly along the ridge line 20. Furthermore, after the irradiation of the hardening region 4 with beam B is completed, the beam may be irradiated to areas on the outer peripheral surface 13 other than the hardening region 4.

[0032] Then, after the heating of the metal member 1 by the beam is completed, the metal member 1 is rapidly cooled to approximately 200°C in a short period of time. As a result, a martensitic transformation occurs in the quenched region 4 of the metal member 1, and the hardness of the quenched region 4 is improved.

[0033] [(4) Irradiation path] In the quenching process, beam B is irradiated along the irradiation path 5 set in the quenching region 4 (see Figure 4). The irradiation path 5 is arranged throughout the entire quenching 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 intersecting sections 51 and 52 (hereinafter also referred to simply as intersecting sections) are sections that intersect the ridge line 20 and are arranged alternately from the starting point 5S to the ending point 5E. For example, each intersecting section extends in a straight line so as to intersect the ridge line 20 at approximately 90°. In addition, each intersecting section has approximately the same length, and each end of the intersecting section is located in the peripheral areas 3 on both the left and right sides of the ridge line section 2, as well as near the ends of the hardening region 4. In other words, each intersecting section crosses the portion that forms the effective width be, and both ends of the intersecting section are located in portions different from the portion that forms the effective width be. Furthermore, each intersecting section is arranged approximately parallel to the ridge line 20 at approximately constant intervals (hereinafter referred to as pitch P) from the starting point 5S to the ending point 5E of the irradiation path 5.

[0035] However, the angle at which each intersection section intersects with the ridge line 20, the length of each intersection section, the shape of each intersection section, the position of each intersection section, or the pitch P can be appropriately determined, for example, according to the shape of the metal member 1 (more specifically, the ridge line section 2) or the shape of the hardening region 4. Furthermore, the irradiation path 5 may have one first intersection section 51 and one second intersection section 52. Also, the ends of each intersection section may be located to the right or left of the ridge line 20 in the ridge line section 2, rather than in the peripheral section 3.

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

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

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

[0039] [(5) Beam irradiation] In the hardening process, a beam B is emitted from the laser head 6 of the laser device towards the irradiation path 5 of the hardening area 4 (see Figures 2 and 3). The irradiation direction of the beam B and the relative position between the beam B light source and the metal member 1 are adjusted so that the irradiation area 50, which is the area irradiated by the beam B, moves along the irradiation path 5 from the starting point 5S to the ending point 5E (see Figure 4). For example, the irradiation area 50 is circular, and its center passes along the irradiation path 5. However, the shape of the irradiation area 50 is not limited to this and can be determined as appropriate.

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

[0041] Furthermore, when the irradiation area 50 moves along 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 along the connection section 53 from the first end 51E of the first intersection section 51 to the second start end 52S of the second intersection section 52, and also moves along the connection section 53 from the second end 52E of the second intersection section 52 to the first start end 51S of the first intersection section 51.

[0042] Of course, this is not the only option; for example, the irradiation area 50 may be moved along the intersection section by moving the laser head 6 and / or metal member 1 configured as a galvanometer head. Alternatively, the irradiation area 50 may be moved along the connection section 53 by changing the irradiation direction of beam B using a galvanometer mirror 60.

[0043] Furthermore, the pitch P and the size of the irradiation area 50 (for example, the diameter of the irradiation area 50) are set so that the passing area 54 formed when the irradiation area 50 passes through the first intersection section 51 and the passing area 54 formed when the irradiation area 50 passes through the second intersection section 52 overlap (see Figure 5). The passing area 54 refers to the area that the irradiation area 50 has passed through. For example, the pitch P may be 0.05 to 0.15 mm, and the diameter of the irradiation area 50 may be approximately 5 mm or more.

[0044] [(6) Movement speed of the irradiation area] As an example, the laser head 6 is positioned such that the light source of beam B is located directly in front of the edge 20 of the metal member 1 (see Figure 2). More specifically, as an example, the laser head 6 may be positioned such that the light source of beam B is closest to the edge 20.

[0045] Furthermore, as the ridge distance D0 (see Figure 4) increases, the speed at which the irradiation direction of beam B changes and the movement speed of the laser head 6 and / or metal member 1 are adjusted so that the movement speed of the irradiation area 50 along the irradiation path 5 decreases. Note that the ridge distance D0 refers to the distance between the ridge 20 and the irradiation area 50.

[0046] Furthermore, as the light source distance D1 (see Figures 2 and 3) increases, the speed at which the irradiation direction of beam B changes and the movement speed of the laser head 6 and / or metal member 1 are adjusted so that the movement speed of the irradiation area 50 along the irradiation path 5 decreases. Note that the light source distance D1 refers to the distance between the light source of 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. Specifically, the hardening region 4 is provided with a high-speed region 40 and two low-speed regions 41. The high-speed region 40 includes a ridge line 20, extends along the ridge line 20 from the first end to the second end of the hardening region 4, has a substantially constant width, and the ridge line 20 is located approximately in the center in the width direction. The low-speed regions 41 are located on both the left and right sides of the high-speed region 40 and extend from the first end to the second end of the hardening region 4. Furthermore, each low-speed region 41 extends to the end in the direction of the intersection section in the hardening region 4, and the width of each low-speed region 41 is substantially the same.

[0048] In other words, when the irradiation area 50 moves along 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 beam B becomes longer than when the irradiation path 5 is located in the high-speed region 40. Furthermore, the speed at which the irradiation area 50 moves when passing through the high-speed region 40 is faster than the speed at which the irradiation area 50 moves when passing through the low-speed region 41. For example, the speed at which the irradiation area 50 moves in the high-speed region 40 is 8000 mm / s, and the speed at which the irradiation area 50 moves in the low-speed region 41 is 4000 mm / s.

[0049] Of course, this is not the only option; for example, N (an integer greater than or equal to 3) steps of movement speed may be provided, and similarly, a high-speed region including the ridge line 20 may be provided, along with N-1 low-speed regions on both sides of the high-speed region. The movement speed of the irradiation region 50 as it passes through each low-speed region may be predetermined, and the further the low-speed region is from the light source of beam B or the ridge line 20 (in other words, the high-speed region), the slower the movement speed of the irradiation region 50 may be.

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

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

[0052] The irradiation area 50 of the second embodiment has an elongated shape that extends in the direction of the ridge line 20. For example, the irradiation area 50 is approximately elliptical, but is not limited to this, and may be approximately rectangular, for example. The irradiation area 50 extends from the first end to the second end in the direction of the ridge line 20 in the quenching area 4.

[0053] In the second embodiment as well, an irradiation path 5 is set in the hardening region 4, but the irradiation path 5 in the second embodiment consists of only one first intersecting section 51. The first intersecting section 51 is located approximately in the center of the direction of the ridge line 20 in the hardening region 4 and is configured in the same way as in the first embodiment. That is, for example, the first intersecting section 51 extends in a straight line so as to intersect the ridge line 20 at approximately 90°, and the first starting end 51S and first ending end 51E, which correspond to the starting point 5S and ending point 5E of the irradiation path 5, are located near the edge of the hardening region 4.

[0054] Then, in the hardening process, the beam B is irradiated over the entire hardening region 4 by moving the irradiation region 50 along the irradiation path 5 from the first starting end 51S to the first ending end 51E of the first intersecting section 51. At this time, as in the first embodiment, the movement speed of the irradiation region 50 decreases as the ridge distance D0 increases, and the movement speed of the irradiation region 50 also decreases as the light source distance D1 increases. Specifically, for example, a high-speed region and a low-speed region may be provided as in the first embodiment, and the irradiation region 50 may be moved at a movement speed corresponding to each region.

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

[0056] The irradiation path 5 may have multiple (for example, several) intersecting sections and connecting sections similar to those in the first embodiment. The beam B may be irradiated so that the irradiation area 50 moves along the irradiation path 5, similar to the first embodiment. In this case, when the irradiation area 50 passes through an intersecting section, the irradiation area 50 extends in a direction perpendicular to the intersecting section, and when the irradiation area 50 passes through a 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, as the light source distance D1 increases, the movement speed of the irradiation area 50 decreases. This prevents excessive heating of the portion of beam B near the light source and insufficient heating of the portion of beam B away from the light source. Also, as the ridge distance D1 increases, the movement speed of the irradiation area 50 decreases. This prevents excessive heating of the portion near the ridge 20 and insufficient heating of the portion away from the ridge 20. Therefore, more uniform heating can be promoted during quenching, thereby preventing damage such as melting through the metal member 1.

[0058] Furthermore, ultra-high-strength steel with a tensile strength of 1470 MPa or higher 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-strength 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. Consequently, it is possible to manufacture a member with properties similar to that of a member made of ultra-high-strength steel without using ultra-high-strength 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 promotes more uniform heating during quenching.

[0060] (3) In addition, 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 and 52 overlap. This allows the hardening area 4 to be heated more reliably.

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

[0062] (5) Furthermore, each intersecting section 51, 52 crosses the portion that forms the effective width be. This promotes uniform heating of the portion that forms the effective width be, thereby enabling hardening while suppressing damage.

[0063] [4. Other Embodiments] (1) The metal member 1 of the first and second embodiments is composed entirely of a plate-like portion. However, the invention is not limited to this, 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 and peripheral portions of the plate-like portion in the same manner as in the first and second embodiments. Furthermore, a quenching process similar to that of the first and second embodiments may be performed on the ridge and peripheral portions formed on the non-plate-like portion of the metal member.

[0064] (2) In the first and second embodiments, the ridge portion 2 and the ridge 20 extend in a straight line. However, the invention is not limited to this, and hardening may be performed by irradiating the hardening region provided on the curved ridge portion 2 and the ridge 20 with the beam B in the same manner.

[0065] Specifically, when setting up an irradiation path having multiple intersecting sections as in the first embodiment, the irradiation path may be arranged to cover the entire hardening area by arranging each intersecting section substantially parallel to the others, similar to the first embodiment. In this case, the angle at which each intersecting section intersects with the ridge line is not limited to approximately 90°, but can be appropriately determined according to the shape of the ridge line. Of course, unlike the first embodiment, the irradiation path may be arranged to cover the entire hardening area by individually determining the orientation of each intersecting section according to the shape of the ridge line. In this case, not all intersecting sections are necessarily substantially parallel, and the angle at which each intersecting section intersects with the ridge line is not limited to approximately 90°, but can be appropriately determined.

[0066] Furthermore, even when irradiating with 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 entire area of ​​the hardening region is irradiated with beam B.

[0067] (3) In the first and second embodiments, the laser head 6 is positioned such that the light source of beam B is located in front of the edge 20 of the metal member 1. However, the position of the laser head 6 is not limited to this and can be determined as appropriate. Even when the light source of beam B is located in a position other than in front of the edge 20 of the metal member 1, the moving speed of the irradiation area 50 may be slowed down as the edge distance D0 increases, or as the light source distance D1 increases.

[0068] (4) Multiple functions of one component in the above embodiment 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. Furthermore, some of the configurations of the above embodiment may be omitted. Also, at least some of the configurations of the above embodiment may be added to or replaced with the configurations of other above embodiments.

[0069] [5. The technical concept disclosed herein] [Item 1] A method for manufacturing a metal component, For hardening, the system includes irradiating a beam toward the ridge portion on the outer surface of the metal member, The aforementioned ridge portion is a part that extends along the ridge, and the cross section of the ridge portion perpendicular to the ridge has a curved shape such that the outer surface protrudes, and the ridge is located at the top of the cross section. The irradiation region, which is the area irradiated by the beam, moves along the irradiation path that passes through the ridge portion. The irradiation path has at least one intersecting section that intersects with the ridge line, As the distance between the irradiation area and the light source of the beam increases, the speed at which the irradiation area moves slows down. A method for manufacturing metal components.

[0070] [Item 2] A method for manufacturing a metal component, For hardening, the system includes irradiating a beam toward the ridge portion on the outer surface of the metal member, The aforementioned ridge portion is a part that extends along the ridge, and the cross section of the ridge portion perpendicular to the ridge has a curved shape such that the outer surface protrudes, and the ridge is located at the top of the cross section. The irradiation region, which is the area irradiated by the beam, moves along the irradiation path that passes through the ridge portion. The irradiation path has at least one intersecting section that intersects with the ridge line, As the distance between the ridge and the irradiation area increases, the speed at which the irradiation area moves slows down. A method for manufacturing metal components.

[0071] [Item 3] A method for manufacturing a metal member as described in item 1 or item 2, The irradiation path has at least one first intersection section which is the intersection section, and at least one second intersection section which is the intersection section. The first and second intersecting sections are arranged alternately from the starting point to the ending point of the irradiation path. The first intersection section has a first starting end, which is the end located to the right of the ridge, and a first ending end, which is the end located to the left of the ridge; the second intersection section has a second starting end, which is the end located to the left of the ridge, and a second ending end, which is the end located to the right of the ridge. The irradiation area moves from the first starting end to the first ending end of the first intersection section, and from the second starting end to the second ending end of the second intersection section. Upon reaching the first ending end of the first intersection section, it moves to the second starting end of the second intersection section adjacent to the ending end of the first intersection section. Upon reaching the second ending end of the second intersection section, it moves to the first starting end of the first intersection section adjacent to the ending end of the second intersection section. A method for manufacturing metal components.

[0072] [Item 4] A method for manufacturing a metal member as described in item 3, The region that the irradiated region has passed through is defined as the passing region. The distance between adjacent first and second intersections and the size of the irradiation area are adjusted so that the passing area formed by the irradiation area passing through the first intersection overlaps with the passing area formed by the irradiation area passing through the second intersection adjacent to the first intersection. A method for manufacturing metal components.

[0073] [Item 5] A method for manufacturing a metal member as described in any of items 1 to 4, By changing the direction of the beam irradiation using a mirror, the irradiation area moves along the intersection section. A method for manufacturing metal components.

[0074] [Item 6] A method for manufacturing a metal member as described in any of items 1 to 5, The aforementioned ridge portion is located on the plate-like portion of the metal member, The aforementioned crossing section is provided so as to traverse the portion that forms the effective width of the plate-like part. A method for manufacturing metal components.

[0075] [Item 7] A method for manufacturing a metal member as described in any of items 1 to 6, The aforementioned metal member is a press-formed member and is used in the body of a vehicle. A method for manufacturing metal components. [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, 13...outer surface, 2...ridge section, 20...ridge, 3...periphery, 4...hardened area, 40...high-speed area, 41...low-speed area, 5...irradiation path, 5S...start point, 5E...end point, 50...irradiation area, 51...first intersection section, 51S...first start end, 51E...first end end, 52...second intersection section, 52S...second start end, 52E...second end end, 53...connection section, 54...passage area, 6...laser head, 60...galvanometer mirror.

Claims

1. A method for manufacturing a metal component, For hardening, the system includes irradiating a beam toward the ridge portion on the outer surface of the metal member, The aforementioned ridge portion is a part that extends along the ridge, and the cross section of the ridge portion perpendicular to the ridge has a curved shape such that the outer surface protrudes, and the ridge is located at the top of the cross section. The irradiation region, which is the area irradiated by the beam, moves along the irradiation path that passes through the ridge portion. The irradiation path has at least one intersecting section that intersects with the ridge line, As the distance between the irradiation area and the light source of the beam increases, the speed at which the irradiation area moves slows down. A method for manufacturing metal components.

2. A method for manufacturing a metal component, For hardening, the system includes irradiating a beam toward the ridge portion on the outer surface of the metal member, The aforementioned ridge portion is a part that extends along the ridge, and the cross section of the ridge portion perpendicular to the ridge has a curved shape such that the outer surface protrudes, and the ridge is located at the top of the cross section. The irradiation region, which is the area irradiated by the beam, moves along the irradiation path that passes through the ridge portion. The irradiation path has at least one intersecting section that intersects with the ridge line, As the distance between the ridge and the irradiation area increases, the speed at which the irradiation area moves slows down. A method for manufacturing metal components.

3. A method for manufacturing a metal member according to claim 1 or claim 2, The irradiation path has at least one first intersection section which is the intersection section, and at least one second intersection section which is the intersection section. The first and second intersecting sections are arranged alternately from the starting point to the ending point of the irradiation path. The first intersection section has a first starting end, which is the end located to the right of the ridge, and a first ending end, which is the end located to the left of the ridge; the second intersection section has a second starting end, which is the end located to the left of the ridge, and a second ending end, which is the end located to the right of the ridge. The irradiation area moves from the first starting end to the first ending end of the first intersection section, and from the second starting end to the second ending end of the second intersection section. Upon reaching the first ending end of the first intersection section, it moves to the second starting end of the second intersection section adjacent to the ending end end of the first intersection section. Upon reaching the second ending end of the second intersection section, it moves to the first starting end of the first intersection section adjacent to the ending end end end of the second intersection section. A method for manufacturing metal components.

4. A method for manufacturing a metal member according to claim 3, The region that the irradiated region has passed through is defined as the passing region. The distance between adjacent first and second intersections and the size of the irradiation area are adjusted so that the passing area formed by the irradiation area passing through the first intersection overlaps with the passing area formed by the irradiation area passing through the second intersection adjacent to the first intersection. A method for manufacturing metal components.

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

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

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

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