Method for manufacturing metal member

Abstract

The present disclosure relates to a method for manufacturing a metal member in which a light beam is irradiated toward a ridge portion of an outer peripheral surface of the metal member for quenching. The ridge line portion is a portion extending along a ridge line, a cross-section orthogonal to the ridge line of the ridge line portion has a curved shape so that the outer peripheral surface protrudes, and the ridge line is located at the top of the cross-section. An irradiation region, which is a region irradiated by the light beam, moves on an irradiation path passing through the ridge portion. The irradiation path has at least one intersection section, and the at least one intersection section intersects the ridge line. As the distance between the irradiation area and the light source of the light beam increases, the speed at which the irradiation area moves slows down.

Description

[0001] This application claims priority from a Japanese patent with an application date of January 24, 2024 and an application number of JP2024008674A, and this application incorporates the entire text of the above Japanese patent application by reference. Technical Field

[0002] The present disclosure relates to a method for manufacturing a metal component. Background Art

[0003] There is known a technique in which quenching is performed by irradiating a light beam onto the outer surface of a workpiece (for example, Japanese Patent Laid-Open No. 10-176216). In the technique of Patent Document 1, a light beam is irradiated along a portion extending in a ridge line shape (hereinafter referred to as a ridge line portion) in the workpiece, thereby performing quenching. Summary of the Invention

[0004] However, when irradiating a light beam, compared with the peripheral portion adjacent to the ridge line portion, since there is less space for heat dissipation, the ridge line portion of the workpiece tends to reach a higher temperature state more easily, making it difficult to uniformly heat the ridge line portion and the peripheral portion. In particular, when the light source of the light beam is located in front of the ridge line portion, the ridge line portion is more likely to be overheated. As a result, damage such as melting and dripping may occur in the ridge line portion, and the peripheral portion may not be sufficiently heated.

[0005] In addition, when moving the irradiation area of the light beam in a manner that intersects the ridge line portion, the distance between the light source of the light beam and the irradiation area of the light beam may vary. As a result, the portion close to the light source of the light beam may be overheated, or the portion far from the light source of the light beam may not be sufficiently heated.

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

[0007] One aspect of the present disclosure is a method for manufacturing a metal component, which includes irradiating a light beam onto a ridge line portion of the outer peripheral surface of the metal component for quenching. The ridge line portion is a portion extending along the ridge line, and a cross section orthogonal to the ridge line of the ridge line portion has a curved shape that protrudes the outer peripheral surface, and the ridge line is located at the top in the cross section. The irradiation area, that is, the area irradiated with the light beam, moves on an irradiation path passing through the ridge line portion. The irradiation path has at least one intersection interval that intersects the ridge line. As the distance between the irradiation area and the light source of the light beam increases, the speed of movement of the irradiation area slows down.

[0008] According to the above configuration, it is possible to suppress overheating of the portion close to the light source of the light beam or insufficient heating of the portion far from the light source of the light beam. Therefore, it is possible to promote more uniform heating during quenching.

[0009] One aspect of the present disclosure is a method for manufacturing a metal component, which includes irradiating a light beam toward a ridge line portion on the outer peripheral surface of the metal component for quenching. The ridge line portion is a portion extending along the ridge line, and a cross section orthogonal to the ridge line of the ridge line portion has a curved shape that protrudes the outer peripheral surface, and the ridge line is located at the top in the cross section. The irradiated area of the light beam, i.e., the irradiation area, moves on the irradiation path passing through the ridge line portion. The irradiation path has at least one intersection interval, and at least one intersection interval intersects the ridge line. As the distance between the ridge line and the irradiation area increases, the speed of the irradiation area slows down when it moves.

[0010] According to the above configuration, it is possible to suppress overheating of the portion near the ridge line or insufficient heating of the portion far from the ridge line. Therefore, more uniform heating can be promoted during quenching.

[0011] In one aspect of the present disclosure, the irradiation path may have at least one first intersection interval as at least one intersection interval and at least one second intersection interval as at least one intersection interval. At least one first intersection interval and at least one second intersection interval may be alternately arranged from the start point to the end point of the irradiation path. Each of the at least one first intersection intervals may have a first starting end, which is the end on the right side of the ridge line, and a first terminal end, which is the end on the left side of the ridge line. Each of the at least one second intersection intervals may have a second starting end, which is the end on the left side of the ridge line, and a second terminal end, which is the end on the right side of the ridge line. The irradiation area may move from the first starting end of each of the at least one first intersection intervals to the first terminal end, and may move from the second starting end of each of the at least one second intersection intervals to the second terminal end. In addition, when the irradiation area reaches the first terminal end of one of the at least one first intersection intervals, the irradiation area may move to the second starting end of one of the at least one second intervals adjacent to the end point side of the first intersection interval, and when the irradiation area reaches the second terminal end of the second intersection interval, the irradiation area may move to the first starting end of another first intersection interval of the at least one first intersection intervals adjacent to the end point side of the second intersection interval.

[0012] According to the above configuration, more uniform heating can be promoted during quenching.

[0013] In one aspect of the present disclosure, the area passed by the irradiation area may be used as the passing area. The passing area may have: a first passing area formed by the irradiation area passing through the first intersection interval and a second passing area formed by the irradiation area passing through the second intersection interval adjacent to the first intersection interval. The distance between the adjacent first intersection interval and the second intersection interval and the size of the irradiation area may be adjusted so that the first passing area and the second passing area coincide.

[0014] According to the above configuration, it is possible to more effectively heat the metal component during quenching.

[0015] In one aspect of the present disclosure, as at least one first intersection interval, the irradiation path has a plurality of first intersection intervals, and as at least one second intersection interval, the irradiation path has a plurality of second intersection intervals.

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

[0017] In one aspect of the present disclosure, at least one first intersection interval and at least one second intersection interval may be arranged substantially parallel to each other with a substantially fixed interval therebetween.

[0018] According to the above configuration, it is possible to promote more uniform heating during quenching.

[0019] In one aspect of the present disclosure, at least one intersection interval may be substantially orthogonal to the ridge line.

[0020] According to the above configuration, it is possible to promote more uniform heating during quenching.

[0021] In one aspect of the present disclosure, the irradiation area may be moved on at least one intersection interval by changing the irradiation direction of the light beam using a mirror surface.

[0022] According to the above configuration, the light beam can be more suitably irradiated along at least one intersection interval.

[0023] In one aspect of the present disclosure, the ridge line portion may be located in the plate-like portion of the metal component. At least one intersection interval may be provided to straddle a portion that forms an effective width in the plate-like portion.

[0024] According to the above configuration, it is possible to uniformly heat the portion that forms the effective width in the plate-like portion. Thus, quenching can be performed while suppressing damage.

[0025] In one aspect of the present disclosure, the metal component may be a component formed by press molding and may be used for a vehicle body.

[0026] According to the above configuration, it is possible to promote more uniform heating during quenching. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view of the metal component of the first embodiment.

[0028] Figure 2 is an explanatory view of the light beam irradiated from the laser head to the metal component when viewed from the ridge line direction in the first embodiment.

[0029] Figure 3It is an explanatory diagram of the light beam irradiated from the laser head to the metal component when visually confirmed from one side of the first side surface in the first embodiment.

[0030] Figure 4 It is an explanatory diagram of the irradiation area and irradiation path in the first embodiment.

[0031] Figure 5 It is an explanatory diagram of the irradiation area, irradiation path, and passing area in the first embodiment.

[0032] Figure 6 It is an explanatory diagram of the irradiation area and irradiation path in the second embodiment.

[0033] Figure 7 It is an explanatory diagram of the light beam irradiated from the laser head to the metal component when visually confirmed from the ridge line direction in the second embodiment. Detailed Embodiments

[0034] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0035] [1. First Embodiment]

[0036] [(1) Outline]

[0037] The manufacturing method of the metal component 1 in the first embodiment (refer to Figure 1 ) includes a process of quenching the metal component 1 with a light beam. The metal component 1 is a plate-shaped component made of metal (taking iron as an example). As an example, the material constituting the metal component 1 can be high-tensile strength steel, more specifically, high-tensile strength steel with a tensile strength of 590 Mpa or more. In addition, as an example, the metal component 1 can be used as a part of a vehicle, more specifically, as a part of a vehicle body. Of course, it is not limited thereto, and the metal component 1 can also be a component not installed in a vehicle.

[0038] The metal component 1 is a groove-shaped component extending along the extension direction E, and it 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 (refer to Figure 1 and Figure 2 ).

[0039] The top portion 10 is an elongated plate-shaped portion extending in a planar shape along the extension direction E, and a stepped portion 10A extending along the extension direction E is formed at the center in the width direction of the top portion 10.

[0040] The first side face portion 11 and the second side face portion 12 are plate-like portions extending from both ends in the width direction of the top portion 10, and the first side face portion 11 and the second side face portion 12 are opposed to each other in the width direction of the top portion 10. The first side face portion 11 and the second side face portion 12 both extend from the first end to the second end of the top portion 10 in the extending direction E.

[0041] The first flange portion 11A and the second flange portion 12A are flange-like portions respectively provided at the ends on the side opposite to the top portion 10 in the first side face portion 11 and the second side face portion 12. The first flange portion 11A and the second flange portion 12A respectively extend from the first end to the second end of the first side face portion 11 and the second side face portion 12 in the extending direction E.

[0042] That is to say, the first side face portion 11 and the second side face portion 12 form the opening of the metal component 1 as a groove-shaped component, and the first flange portion 11A and the second flange portion 12A are disposed on both sides of the opening. Moreover, the surfaces of the top portion 10, the first side face portion 11, and the second side face portion 12 on the side opposite to the opening form the outer peripheral surface 13 of the metal component 1.

[0043] [(2) Ridge line portion and peripheral portion]

[0044] A ridge line portion 2 is formed at the junction of the top portion 10 and the first side face portion 11, and the ridge line portion 2 extends linearly along the ridge line 20 (refer to Figure 1 and Figure 2 ). The ridge line 20 extends linearly along the extending direction E and is included in the ridge line portion 2. In addition, the ridge line portion 2 and the ridge line 20 extend from the first end to the second end of the metal component 1.

[0045] The cross-section orthogonal to the ridge line 20 of the ridge line portion 2 (hereinafter simply referred to as the cross-section) has a curved shape so that the outer peripheral surface 13 of the metal component 1 protrudes. In the first embodiment, as an example, the entire cross-section of the ridge line portion 2 has a curved shape (refer to Figure 2 ). However, it is not limited thereto, and the cross-section of the ridge line portion 2 may also have a curved portion and a portion extending in a planar shape, or may have a folded shape. Moreover, the ridge line 20 is located at the top of the cross-section.

[0046] In addition, the length of the ridge line portion 2 in the ridge line width direction W is substantially the same as the Karman effective width be in the metal component 1, where the ridge line width direction W is the direction along the outer peripheral surface 13 and is the direction orthogonal to the extending direction E. As an example, the effective width be is calculated by the following formula.

[0047]

[0048] Here, E is the Young's modulus of the metal constituting the metal component 1, k is the constraint coefficient, γ is the Poisson's ratio, σy is the yield point (Mpa), and t is the thickness (mm) of the metal component 1. Of course, the length W in the ridge width direction at the ridge portion 2 is not limited to the effective width be and can be set as needed.

[0049] In addition, the portion adjacent to the ridge portion 2 in the top portion 10 and the portion adjacent to the ridge portion 2 in the first side surface portion 11 are defined as the peripheral portion 3. That is, there are two portions of the peripheral portion 3, which are respectively located on the left and right sides of the ridge portion 2. In addition, the cross-section of the peripheral portion 3 extends in a planar shape. In addition, the peripheral portion 3 also extends from the first end to the second end of the metal component 1.

[0050] [(3) Method for manufacturing a metal component]

[0051] The method for manufacturing the metal component 1 includes a process of forming the metal component 1 by stamping and a quenching process of quenching the metal component 1 (refer to Figures 2 to 5 ). In addition, the metal component 1 can also be formed by a method other than stamping.

[0052] In the quenching process, a light beam B is irradiated toward the quenching region 4, and the quenching region 4 is provided in the portion of the outer peripheral surface 13 of the metal component 1 where the ridge portion 2 and the peripheral portion 3 are located. As an example, the quenching region 4 is heated to about 900 °C.

[0053] In addition, the position, shape, and size of the quenching region 4 can be appropriately set as needed. As an example, the quenching region 4 extends to the ridge portion 2 and the peripheral portions 3 on the left and right sides of the ridge portion 2. However, it is not limited thereto, and the quenching region 4 can also be provided on the ridge portion 2 or on one side of the ridge portion 2 and the peripheral portion 3. In addition, the quenching region 4 extends in a strip shape along the direction of the ridge line 20 and has a substantially fixed width, and the ridge line 20 is located approximately at the center in the width direction. In addition, both ends of the quenching region 4 in the ridge width direction W extend linearly along the ridge line 20. In addition, after the irradiation of the light beam to the quenching region 4 is completed, the light beam can be further irradiated to the region other than the quenching region 4 on the outer peripheral surface 13.

[0054] Then, after the heating of the metal component 1 by the light beam is completed, as an example, the metal component 1 is rapidly cooled to about 200 °C in a short time. Thus, a martensitic transformation occurs in the quenching region 4 of the metal component 1, and the hardness of the quenching region 4 can be improved.

[0055] [(4) Irradiation path]

[0056] In the quenching process, the light beam B is irradiated along the irradiation path 5 provided in the quenching region 4 (refer to Figure 4)。The irradiation path 5 is arranged in the entire area of the quenching area 4 and has a plurality of first intersection intervals 51, a plurality of second intersection intervals 52, and a plurality of connection intervals 53.

[0057] The first intersection interval 51 and the second intersection interval 52 (also simply referred to as the intersection interval hereinafter) are intervals that respectively intersect with the ridge line 20, and the first intersection interval 51 and the second intersection interval 52 are alternately arranged from the starting point 5S to the ending point 5E. As an example, each intersection interval extends linearly in a manner that intersects with the ridge line 20 at 90°. In addition, each intersection interval has substantially the same length, and each end of each intersection interval is located on the peripheral part 3 on the left and right sides of the ridge line part 2 and near the end of the quenching area 4. That is to say, each intersection interval straddles the part forming the effective width be, and both ends of each intersection interval are located in a part different from the part forming the effective width be. In addition, from the starting point 5S of the irradiation path 5 towards the ending point 5E, each intersection interval is arranged substantially parallel to the ridge line 20 at a substantially fixed interval (referred to as the pitch P hereinafter).

[0058] However, not limited thereto, the angle at which each intersection interval intersects with the ridge line 20, the length of each intersection interval, the shape of each intersection interval, the position of each intersection interval, or the pitch P can be appropriately set according to, for example, the shape of the metal component 1 (more specifically, the ridge line part 2) and / or the shape of the quenching area 4, etc. In addition, the irradiation path 5 can have one first intersection interval 51 and one second intersection interval 52. In addition, the ends of each intersection interval can be located on the right or left side of the ridge line 20 in the ridge line part 2, rather than in the peripheral part 3.

[0059] Moreover, each first intersection interval 51 has an end on the right side of the ridge line 20, namely the first starting end 51S, and an end on the left side of the ridge line 20, namely the first terminal end 51E. In addition, each second intersection interval 52 has an end on the left side of the ridge line 20, namely the second starting end 52S, and an end on the right side of the ridge line 20, namely the second terminal end 52E.

[0060] In addition, on the left side of the ridge line 20, the first terminal end 51E of the first intersection interval 51 and the second starting end 52S of the second intersection interval 52 adjacent to the ending point 5E side of the first intersection interval 51 are connected to each other by the connection interval 53. In addition, on the right side of the ridge line 20, the second terminal end 52E of the second intersection interval 52 and the first starting end 51S of the first intersection interval 51 adjacent to the ending point 5E side of the second intersection interval 52 are connected to each other by the connection interval 53.

[0061] In addition, as an example, the first starting end 51S of the first intersection interval 51 is located at the starting point 5S of the irradiation path 5. However, without being limited thereto, the second starting end 52S of the second intersection interval 52 may also be located at the starting point 5S. In addition, as an example, the second terminal 52E of the second intersection interval 52 is located at the ending point 5E of the irradiation path 5. However, without being limited thereto, the first terminal 51E of the first intersection interval 51 may also be located at the ending point 5E.

[0062] [(5) Irradiation of the light beam]

[0063] In the quenching process, a light beam B is irradiated from the laser head 6 of the laser device onto the irradiation path 5 leading to the quenching region 4 (refer to Figure 2 and Figure 3 ). Then, the irradiation direction of the light beam B and the relative position between the light source of the light beam B and the metal component 1 are adjusted so that the region irradiated by the light beam B, i.e., the irradiation region 50, moves on the irradiation path 5 from the starting point 5S of the irradiation path 5 to the ending point 5E (refer to Figure 4 ). Additionally, as an example, the irradiation region 50 is circular, and the center of the irradiation region 50 passes through the irradiation path 5. However, it is not limited thereto, and the shape of the irradiation region 50 can be appropriately set as needed.

[0064] Specifically, when the irradiation region 50 moves on the intersection interval, the irradiation direction of the light beam B is changed by adjusting the direction of the galvanometer mirror 60 provided in the laser head 6. As a result, the irradiation region 50 moves from the first starting end 51S to the first terminal 51E on the first intersection interval 51, and moves from the second starting end 52S to the second terminal 52E on the second intersection interval 52.

[0065] In addition, when the irradiation region 50 moves on the connection interval 53, the laser head 6 and / or the metal component 1 are moved along the direction of the ridge line 20. As a result, the irradiation region 50 moves from the first terminal 51E of the first intersection interval 51 to the second starting end 52S of the second intersection interval 52 on the connection interval 53, and moves from the second terminal 52E of the second intersection interval 52 to the first starting end 51S of the first intersection interval 51 on the connection interval 53.

[0066] Of course, it is not limited thereto. For example, the irradiation region 50 can also be moved on the intersection interval by moving the laser head 6 and / or the metal component 1 that constitute the galvanometer head. Additionally, for example, the irradiation region 50 can be moved on the connection interval 53 by changing the irradiation direction of the light beam B using the galvanometer mirror 60.

[0067] In addition, the pitch P and the size of the irradiation region 50 (for example, the diameter of the irradiation region 50) are set such that the passage region 54 formed by the irradiation region 50 passing through the first intersection interval 51 and the passage region 54 formed by the irradiation region 50 passing through the second intersection interval 52 adjacent to the first intersection interval 51 coincide (refer to Figure 5 ). In addition, the passage region 54 refers to the region through which the irradiation region 50 passes. As an 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 about 5 mm or more.

[0068] [(6) Moving speed of the irradiation region]

[0069] As an example, the laser head 6 is configured such that the light source of the light beam B is located in front of the ridge line 20 of the metal component 1 (refer to Figure 2 ). More specifically, as an example, the laser head 6 may be configured such that the light source of the light beam B is closest to the ridge line 20.

[0070] In addition, the changing speed of the irradiation direction of the light beam B and the moving speed of the laser head 6 and / or the metal component 1 are adjusted such that as the ridge line distance D0 (refer to Figure 4 ) increases, the moving speed of the irradiation region 50 when moving on the irradiation path 5 slows down. In addition, the ridge line distance D0 refers to the distance between the ridge line 20 and the irradiation region 50.

[0071] In addition, the changing speed of the irradiation direction of the light beam B and the moving speed of the laser head 6 and / or the metal component 1 are adjusted such that as the light source distance D1 (refer to Figure 2 and Figure 3 ) increases, the moving speed of the irradiation region 50 when moving on the irradiation path 5 slows down. In addition, the light source distance D1 refers to the distance between the light source of the light beam B in the laser head 6 and the irradiation region 50.

[0072] In the first embodiment, as an example, two moving speeds are set. That is, the quenching region 4 has a high-speed region 40 and two low-speed regions 41. The high-speed region 40 includes the ridge line 20, extends from the first end of the quenching region 4 along the ridge line 20 to the second end, and has a substantially fixed width, and the ridge line 20 is located approximately in the center in the width direction. In addition, each low-speed region 41 is located on the left and right sides of the high-speed region 40 and extends from the first end of the quenching region 4 to the second end. In addition, each low-speed region 41 extends to the end in the direction of the intersection interval of the quenching region 4, and the widths of each low-speed region 41 are substantially the same.

[0073] That is to say, when the irradiation area 50 moves along the irradiation path 5 located in the low-speed area 41, the distances between the irradiation area 50 and the ridge line 20, and between the irradiation area 50 and the light source of the light beam B will both increase compared with when the irradiation area 50 moves along the irradiation path 5 located in the high-speed area 40. Moreover, the moving speed of the irradiation area 50 when passing through the high-speed area 40 is faster than that when the irradiation area 50 passes through the low-speed area 41. As an example, the moving speed of the irradiation area 50 in the high-speed area 40 is 8000 mm / s, while the moving speed of the irradiation area 50 in the low-speed area 41 is 4000 mm / s.

[0074] Of course, it is not limited to this. For example, the moving speed can be set in N (an integer of 3 or more) segments. In the same way, a high-speed area including the ridge line 20 can be set, and N - 1 low-speed areas can be set on both sides of the high-speed area. Moreover, the moving speed of the irradiation area 50 when passing through each low-speed area can be preset, and the farther the low-speed area is from the light source of the light beam B or the ridge line 20 (in other words, the high-speed area), the slower the moving speed of the irradiation area 50 in it.

[0075] In addition, for example, instead of setting a high-speed area and a low-speed area, the moving speed of the irradiation area 50 can be gradually slowed down as the light source distance D1 increases, or the moving speed of the irradiation area 50 can be gradually slowed down as the ridge line distance D0 increases.

[0076] [2. Second Embodiment]

[0077] The difference in the manufacturing method of the metal component 1 in the second embodiment from that in the first embodiment lies in the shape of the irradiation area 50 (refer to Figure 6 ). Hereinafter, the differences between the manufacturing method of the metal component 1 in the second embodiment and that in the first embodiment will be described.

[0078] The irradiation area 50 in the second embodiment has an elongated shape extending along the direction of the ridge line 20. As an example, the irradiation area 50 is substantially elliptical, but it is not limited thereto. For example, it can also be substantially rectangular. In addition, the irradiation area 50 extends from the first end to the second end along the direction of the ridge line 20 in the quenching area 4.

[0079] In addition, in the second embodiment, the irradiation path 5 is provided in the quenching region 4. However, the irradiation path 5 of the second embodiment is only composed of a single first intersection section 51. This first intersection section 51 is provided approximately at the center in the direction of the ridge line 20 in the quenching region 4, and its configuration is the same as that of the first embodiment. That is, as an example, the first intersection section 51 extends linearly in a manner that intersects the ridge line 20 at approximately 90°, and the first starting end 51S and the first terminal end 51E corresponding to the starting point 5S and the ending point 5E of the irradiation path 5 are respectively located near the ends of the quenching region 4.

[0080] Moreover, in the quenching process, by moving the irradiation region 50 on the irradiation path 5 from the first starting end 51S to the first terminal end 51E of the first intersection section 51, the entire region of the quenching region 4 is irradiated with the light beam B. At this time, similar to the first embodiment, as the ridge line distance D0 increases, the moving speed of the irradiation region 50 slows down, and as the light source distance D1 increases, the moving speed of the irradiation region 50 also slows down. Specifically, for example, the high-speed region and the low-speed region can be set in the same manner as in the first embodiment, and the irradiation region 50 can be moved at the moving speeds corresponding to the respective regions.

[0081] In addition, when the irradiation region 50 moves on the irradiation path 5, the irradiation region 50 is in a state of extending along a direction orthogonal to the first intersection section 51. In addition, as an example, the irradiation region 50 can be moved by moving the laser head 6 and / or the metal component 1 (refer to Figure 7 ). Of course, it is not limited to this. For example, the irradiation region 50 can also be moved by changing the irradiation direction of the light beam B by using a galvanometer scanner 60.

[0082] In addition, the irradiation path 5 can have multiple (as an example, several) intersection sections and connection sections similar to those in the first embodiment. Moreover, similar to the first embodiment, the light beam B can be irradiated in such a way that the irradiation region 50 moves on the irradiation path 5. In this case, when the irradiation region 50 passes through the intersection section, the irradiation region 50 is in a state of extending along a direction orthogonal to the intersection section, and when the irradiation region 50 passes through the connection section, the irradiation region 50 is in a state of extending along the direction of the connection section.

[0083] [3. Effects]

[0084] According to the embodiments described in detail above, the following effects can be obtained.

[0085] (1)According to the first embodiment and the second embodiment, as the light source distance D1 increases, the moving speed of the irradiation region 50 slows down. Thereby, it is possible to suppress the part of the metal member 1 near the light source of the light beam B from being overheated and the part of the metal member 1 far from the light source of the light beam B from being insufficiently heated. In addition, as the ridge line distance D0 increases, the moving speed of the irradiation region 50 slows down. Therefore, it is possible to suppress the part near the ridge line 20 of the metal member 1 from being overheated and the part of the metal member 1 far from the ridge line 20 from being insufficiently heated. Thus, it is possible to promote more uniform heating during quenching, and thereby suppress damage such as melting and dripping of the metal member 1.

[0086] In addition, it is difficult to perform stamping on ultra-high tensile strength steel with a tensile strength of 1470 MPa or more. In this regard, according to the first embodiment and the second embodiment, local quenching can be appropriately performed. Therefore, by forming a part by stamping a high-strength steel with a low tensile strength and then performing the quenching of the first embodiment and the second embodiment, the hardness of the part can be appropriately increased. Therefore, it is possible to manufacture a part having similar characteristics to a part made of ultra-high tensile strength steel without using ultra-high tensile strength steel, and the cost can be reduced.

[0087] (2)In addition, according to the first embodiment, the irradiation path 5 has a plurality of intersection intervals 51, 52 that intersect the ridge line 20. Thereby, it is possible to promote more uniform heating during quenching.

[0088] (3)In addition, according to the first embodiment, the pitch P and the size of the irradiation region 50 are adjusted so that the passage regions 54 formed in the adjacent first intersection interval 51 and second intersection interval 52 overlap each other. Thereby, it is possible to more reliably heat the quenching region 4.

[0089] (4)In addition, by changing the irradiation direction of the light beam B using the galvanometer 60, the irradiation region 50 is moved on the intersection intervals 51, 52. Thereby, it is possible to more suitably irradiate the light beam B along the intersection intervals 51, 52.

[0090] (5)In addition, each of the intersection intervals 51, 52 straddles the part of the metal member 1 that forms the effective width be. Thereby, it is possible to promote the part that forms the effective width be to be uniformly heated, and thus it is possible to perform quenching while suppressing damage.

[0091] [4. Other Embodiments]

[0092] The embodiments of the present disclosure have been described above, but the content of the present disclosure is not limited to the above embodiments and can take various forms.

[0093] (1) The entire metal component 1 in the first embodiment and the second embodiment is composed of a plate-shaped portion. However, it is not limited thereto. In the manufacturing method of a metal component with a plate-shaped portion provided locally, the quenching process can also be performed on the ridge line portion and the peripheral portion in the plate-shaped portion in the same manner as in the first embodiment and the second embodiment. In addition, the quenching process can also be performed on the ridge line portion and the peripheral portion formed on the non-plate-shaped portion of the metal component in the same manner as in the first embodiment and the second embodiment.

[0094] (2) In the first embodiment and the second embodiment, the ridge line portion 2 and the ridge line 20 extend linearly. However, it is not limited thereto. The quenching of the quenching region provided on the ridge line portion 2 and the ridge line 20 having a curved shape can also be performed by irradiating the light beam B in the same manner as in the first embodiment and the second embodiment.

[0095] Specifically, when setting the irradiation path having a plurality of intersection intervals as described in the first embodiment, in the same manner as in the first embodiment, the irradiation path can be arranged in the entire region of the quenching region by arranging the respective intersection intervals in a substantially parallel manner. In this case, the angle at which each intersection interval intersects the ridge line is not limited to approximately 90°, but can be appropriately set according to the shape of the ridge line. Of course, the difference from the first embodiment is that the irradiation path can be arranged in the entire region of the quenching region by separately setting the directions of the respective intersection intervals according to the shape of the ridge line. In this case, it is not limited to all the intersection intervals being arranged substantially parallel, and in addition, the angle at which each intersection interval intersects the ridge line can be appropriately set as needed, and is not limited to approximately 90°.

[0096] In addition, even when irradiating the light beam B having an elongated irradiation region as described in the second embodiment, the light beam B can be irradiated to the entire region of the quenching region by setting the shapes of the irradiation region and the intersection intervals according to the shape of the ridge line 20.

[0097] (3) In the first embodiment and the second embodiment, the laser head 6 is arranged such that the light source of the light beam B is located in front of the ridge line 20 of the metal component 1. However, it is not limited thereto, and the position of the laser head 6 can be appropriately set as needed. Moreover, even when the light source of the light beam B is located at a position other than in front of the ridge line 20 of the metal component 1, the moving speed of the irradiation region 50 can be slowed down as the ridge line distance D0 increases, or the moving speed of the irradiation region 50 can be slowed down as the light source distance D1 increases.

[0098] (4) Multiple constituent elements may implement multiple functions of one constituent element in the above-described embodiments, or multiple constituent elements may implement one function of one constituent element. In addition, one constituent element may implement multiple functions of multiple constituent elements, or one constituent element may implement one function of multiple constituent elements. In addition, a part of the configuration of the above-described embodiments may be omitted. In addition, at least a part of the configuration of the above-described embodiments may be added to the configuration of the above-described other embodiments, or at least a part of the configuration of the above-described embodiments may be replaced with the configuration of the above-described other embodiments, etc.

[0099] [Technical idea disclosed in this specification]

[0100] [Item 1]

[0101] A method for manufacturing a metal component, comprising irradiating a light beam toward a ridge line portion of an outer peripheral surface of the metal component for quenching, wherein the method for manufacturing the metal component is characterized in that

[0102] The ridge line portion is a portion extending along the ridge line, and a cross section orthogonal to the ridge line of the ridge line portion has a curved shape so as to protrude the outer peripheral surface, and the ridge line is located at the top in the cross section.

[0103] The area irradiated by the light beam, i.e., the irradiation area, moves on an irradiation path passing through the ridge line portion.

[0104] The irradiation path has at least one intersection interval that intersects the ridge line.

[0105] As the distance between the irradiation area and the light source of the light beam increases, the speed of the irradiation area during movement slows down.

[0106] [Item 2]

[0107] According to the method for manufacturing a metal component described in Item 1, comprising irradiating a light beam toward a ridge line portion of an outer peripheral surface of the metal component for quenching,

[0108] The method for manufacturing the metal component is characterized in that

[0109] The ridge line portion is a portion extending along the ridge line, and a cross section orthogonal to the ridge line of the ridge line portion has a curved shape so as to protrude the outer peripheral surface, and the ridge line is located at the top in the cross section.

[0110] The area irradiated by the light beam, i.e., the irradiation area, moves on an irradiation path passing through the ridge line portion.

[0111] The irradiation path has at least one intersection interval that intersects the ridge line.

[0112] As the distance between the ridge line and the irradiation area increases, the speed of the irradiation area when moving slows down.

[0113] [Item 3]

[0114] The manufacturing method of the metal component according to Item 1 or 2, characterized in that

[0115] The irradiation path has at least one first intersection interval as the at least one intersection interval and at least one second intersection interval as the at least one intersection interval,

[0116] The at least one first intersection interval and the at least one second intersection interval are alternately arranged from the starting point to the ending point of the irradiation path,

[0117] Each of the at least one first intersection intervals has an end on the right side of the ridge line, i.e., a first starting end, and an end on the left side of the ridge line, i.e., a first terminal end. Each of the at least one second intersection intervals has an end on the left side of the ridge line, i.e., a second starting end, and an end on the right side of the ridge line, i.e., a second terminal end.

[0118] The irradiation area moves from the first starting end of each of the at least one first intersection intervals to the first terminal end, and moves from the second starting end of each of the at least one second intersection intervals to the second terminal end,

[0119] Wherein, when the irradiation area reaches the first terminal end of one of the at least one first intersection intervals, the irradiation area moves to the second starting end of one of the at least one second intervals adjacent to the side of the end point of the first intersection interval,

[0120] And when the irradiation area reaches the second terminal end of the second intersection interval, the irradiation area moves to the first starting end of another first intersection interval of the at least one first intersection intervals adjacent to the side of the end point of the second intersection interval.

[0121] [Item 4]

[0122] The manufacturing method of the metal component according to Item 3, characterized in that

[0123] The area passed by the irradiation area is used as a passing area,

[0124] The passing area has: a first passing area formed by the irradiation area passing through the first intersection interval and a second passing area formed by the irradiation area passing through the second intersection interval adjacent to the first intersection interval,

[0125] In addition, the distance between the first intersection interval and the second intersection interval adjacent to each other, and the size of the irradiation region are adjusted so that the first passage region and the second passage region coincide with each other.

[0126] [Item 5]

[0127] The method for manufacturing a metal component according to any one of Items 1 to 4, characterized in that

[0128] The irradiation direction of the light beam is changed by using a mirror surface, so that the irradiation region moves on the at least one intersection interval.

[0129] [Item 6]

[0130] The method for manufacturing a metal component according to any one of Items 1 to 5, characterized in that

[0131] The ridge line portion is located in the plate-shaped portion of the metal component,

[0132] The at least one intersection interval is provided so as to straddle a portion of the plate-shaped portion that forms an effective width.

[0133] [Item 7]

[0134] The quenching device according to any one of Items 1 to 6, characterized in that

[0135] The metal component is a component formed by stamping and is used for a vehicle body.

Claims

1. A manufacturing method of a metal component, comprising irradiating a light beam toward a ridge line portion on an outer peripheral surface of the metal component for quenching, wherein the manufacturing method of the metal component is characterized in that, the ridge line portion is a portion extending along a ridge line, and a cross section orthogonal to the ridge line of the ridge line portion has a curved shape in a manner that the outer peripheral surface protrudes, and the ridge line is located at the top in the cross section, a region irradiated with the light beam, i.e., an irradiation region, moves on an irradiation path passing through the ridge line portion, the irradiation path has at least one intersecting interval that intersects with the ridge line, as the distance between the irradiation region and a light source of the light beam increases, the speed of the irradiation region during movement slows down.

2. A manufacturing method of a metal component, comprising irradiating a light beam toward a ridge line portion on an outer peripheral surface of the metal component for quenching, wherein the manufacturing method of the metal component is characterized in that, the ridge line portion is a portion extending along a ridge line, and a cross section orthogonal to the ridge line of the ridge line portion has a curved shape in a manner that the outer peripheral surface protrudes, and the ridge line is located at the top in the cross section, a region irradiated with the light beam, i.e., an irradiation region, moves on an irradiation path passing through the ridge line portion, the irradiation path has at least one intersecting interval that intersects with the ridge line, as the distance between the ridge line and the irradiation region increases, the speed of the irradiation region during movement slows down.

3. The manufacturing method of the metal component according to claim 1 or 2, wherein, the irradiation path has at least one first intersecting interval as the at least one intersecting interval and at least one second intersecting interval as the at least one intersecting interval, the at least one first intersecting interval and the at least one second intersecting interval are alternately arranged from a starting point to an ending point of the irradiation path, each of the at least one first intersecting intervals has an end portion on the right side of the ridge line, i.e., a first starting end, and an end portion on the left side of the ridge line, i.e., a first terminal end, and each of the at least one second intersecting intervals has an end portion on the left side of the ridge line, i.e., a second starting end, and an end portion on the right side of the ridge line, i.e., a second terminal end, the irradiation region moves from the first starting end of each of the at least one first intersecting intervals to the first terminal end, and moves from the second starting end of each of the at least one second intersecting intervals to the second terminal end, wherein, when the irradiation region reaches the first terminal end of one of the at least one first intersecting intervals, the irradiation region moves to the second starting end of one of the at least one second intersecting intervals adjacent to one side of the ending point of the first intersecting interval, and when the irradiation region reaches the second terminal end of the second intersecting interval, the irradiation region moves to the first starting end of another one of the at least one first intersecting intervals adjacent to one side of the ending point of the second intersecting interval.

4. The manufacturing method of the metal component according to claim 3, wherein, Take the area through which the irradiation area passes as the passing area. The passing area has: a first passing area formed by the irradiation area passing through the first intersection interval and a second passing area formed by the irradiation area passing through the second intersection interval adjacent to the first intersection interval. In addition, adjust the distance between the adjacent first intersection interval and the second intersection interval, and the size of the irradiation area, so that the first passing area and the second passing area coincide.

5. The method for manufacturing a metal component according to claim 3 or 4, wherein As the at least one first intersection interval, the irradiation path has a plurality of first intersection intervals, and as the at least one second intersection interval, the irradiation path has a plurality of second intersection intervals.

6. The method for manufacturing a metal component according to any one of claims 3 to 5, wherein The at least one first intersection interval and the at least one second intersection interval are arranged substantially parallel to each other with a substantially fixed interval therebetween.

7. The method for manufacturing a metal component according to any one of claims 1 to 6, wherein The at least one intersection interval is substantially orthogonal to the ridge line.

8. The method for manufacturing a metal component according to any one of claims 1 to 7, wherein By using a mirror to change the irradiation direction of the light beam, the irradiation area is moved on the at least one intersection interval.

9. The method for manufacturing a metal component according to any one of claims 1 to 8, wherein The ridge line portion is located in the plate-like portion of the metal component. The at least one intersection interval is arranged to straddle a portion of the plate-like portion that forms an effective width.

10. The method for manufacturing a metal component according to any one of claims 1 to 9, wherein The metal component is a component formed by stamping and is used for the vehicle body.

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