WO2019189598A1 - Vehicle body component - Google Patents

Vehicle body component Download PDF

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Publication number
WO2019189598A1
WO2019189598A1 PCT/JP2019/013645 JP2019013645W WO2019189598A1 WO 2019189598 A1 WO2019189598 A1 WO 2019189598A1 JP 2019013645 W JP2019013645 W JP 2019013645W WO 2019189598 A1 WO2019189598 A1 WO 2019189598A1
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WIPO (PCT)
Prior art keywords
impact beam
cutting
matching
door impact
vehicle body
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Application number
PCT/JP2019/013645
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French (fr)
Japanese (ja)
Inventor
鈴木　貴之
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アイシン高丘株式会社
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Application filed by アイシン高丘株式会社 filed Critical アイシン高丘株式会社
Publication of WO2019189598A1 publication Critical patent/WO2019189598A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/04—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for

Definitions

  • This disclosure relates to body parts of vehicles such as automobiles.
  • framework parts and reinforcing parts are known as body parts used for the vehicle body.
  • Reinforcing parts reinforce the strength of the skeleton for vehicle handling stability, vibration suppression, noise suppression, deformation suppression at the time of collision, and the like.
  • a trimming process may be performed after molding.
  • a processing mark having a concave shape is formed at a connecting portion where the cutting line in the former stage processing and the cutting line in the latter stage machining intersect.
  • the machining trace is formed in order to prevent a step from being generated in the outer edge portion of the component due to a machining error between the former stage machining and the latter stage machining.
  • a processing mark is formed on a long side portion of an outer edge portion (see, for example, Patent Document 1).
  • the main object of the present disclosure is to obtain a vehicle body part that can stably maintain the collision energy absorption performance even if the processing mark formed by the multi-step cutting process is formed on the outer edge portion. .
  • the vehicle body part of the first aspect is a vehicle body part formed in a long shape, and includes a hat part extending in the longitudinal direction and an outer edge part at the time of manufacturing by multi-stage punching. And matching formed on the short side.
  • the vehicle body part according to the second aspect is a vehicle body part formed in an elongated shape, and has a hat part extending in the longitudinal direction, and a short side of the outer edge part at the time of manufacturing by multi-stage cutting including laser cutting Laser processing marks formed on the portion.
  • the vehicle body component according to the third aspect is formed of a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa.
  • the vehicle body component of the first aspect since matching is provided not on the long side portion but on the short side portion, even if an external force due to a collision or the like acts on the vehicle body component, stress is not concentrated on the matching. Is done. As a result, even if an external force such as a collision is applied to the vehicle body part, the performance of the vehicle body part can be stably maintained without a sudden decrease in the collision energy absorption performance.
  • the laser processing trace is provided on the short side instead of the long side.
  • the laser processing trace is a trace accompanying laser cutting processing such as a piercing mark, a laser cutting start mark, and a laser cutting end mark due to laser irradiation, and is formed in a concave shape at the outer edge of the vehicle body part. Since the concave laser processing trace is provided on the short side portion, even if an external force due to a collision or the like acts on the vehicle body part, it is avoided that stress is concentrated on the concave portion. As a result, even if an external force such as a collision acts on the vehicle body part, the collision energy absorption performance can be stably maintained without sharply decreasing.
  • the sudden drop in the collision energy absorption performance of the vehicle body part caused by the concentration of stress on the matching is a tensile strength of 1600 MPa or more. This occurs when a 2100 MPa high-tensile steel plate is used. For this reason, in the third aspect, since a high-tensile steel sheet having a tensile strength in this range is used, the effect of stably maintaining the collision energy absorption performance of the vehicle body part becomes remarkable.
  • FIG. 1A The top view which shows a door impact beam.
  • II-II sectional drawing in FIG. Explanatory drawing explaining the outline of the manufacturing method of a door impact beam.
  • FIG. The graph which compares and shows the performance characteristic of Example 1 and Comparative Example 1.
  • FIG. The graph which compares and shows the performance characteristic of Example 2 and Comparative Example 2.
  • FIG. Explanatory drawing explaining the outline of the manufacturing method of another form which manufactures a door impact beam.
  • the vehicle body part of the present embodiment is embodied as a door impact beam which is a skeleton part in a vehicle such as an automobile.
  • Other body parts such as frame parts and reinforcement parts may be used.
  • Other application examples include bumper reinforcement, under-run protector, cross member, floor reinforcement, beltline reinforcement, roof reinforcement. And side sills.
  • FIG. 1A shows a door impact beam 10.
  • the door impact beam 10 is made of a high-tensile steel plate having a tensile strength TS of 1600 MPa or more, preferably 1800 MPa, and is formed by pressing.
  • the door impact beam 10 has a long shape extending in the left-right direction as a whole, and includes a main body 11 extending in the longitudinal direction. Note that the top, bottom, left, and right are based on the plan view shown in FIG. 1A, and the same applies to the following description.
  • the main body 11 is formed in a hat shape along the longitudinal direction, and has a pair of bulging portions 22.
  • the main body portion 11 corresponds to a hat portion.
  • the portion where the bulging portion 22 is provided has a corrugated cross-sectional shape.
  • Flange portions 21 are provided on both upper and lower sides of the bulging portion 22. The strength of the main body 11 is enhanced by the shape in which the bulging portion 22 and the flange portion 21 are provided.
  • Bracket portions 12 are provided at both left and right ends of the main body portion 11.
  • the bracket portion 12 is provided with an attachment portion (not shown) for assembling the door impact beam 10 to the vehicle body.
  • a pair of matching 25 is provided in each of the right end edge portion 23 and the left end edge portion 24 of the bracket portion 12.
  • the outer edge portion of the door impact beam 10 includes an upper edge portion 11a and a lower edge portion 11b of the main body portion 11, an upper edge portion 12a and a lower edge portion 12b of the bracket portion 12, and a right end edge portion 23 of the bracket portion 12. It consists of a left edge 24. Among them, the right end edge portion 23 and the left end edge portion 24 of the bracket portion 12 correspond to short side portions, respectively.
  • a matching 25 is formed.
  • the matching 25 is formed in a concave shape having a quadrangular shape as shown in an enlarged view in FIG. 1B.
  • a process of obtaining a blank material by cutting a metal plate material, and forming the blank material into a predetermined shape The process of carrying out.
  • the door impact beam 10 of the present embodiment has a process of performing trimming after molding in addition to these two processes. In this trimming process, a plurality of stages of press cutting are performed, and matching 25 is formed at that time.
  • the trimming process in which the matching 25 is formed will be described.
  • the trimmed part 30 before the door impact beam 10 is obtained by trimming is formed.
  • the to-be-trimmed part 30 is formed by hot-pressing a blank material, and has a product portion 31 and a cut-out portion 32 to be the door impact beam 10.
  • the die quench method is employ
  • the die quench method is a method in which a steel sheet is heated to, for example, 800 ° C. to 1100 ° C. and press-molded at a high temperature to perform quenching by quenching at the same time as molding with a relatively low temperature mold.
  • the tensile strength of the steel plate used as a raw material can be improved.
  • the door impact beam 10 is formed of a high-tensile steel plate having a tensile strength of 1600 MPa, preferably 1800 MPa or more.
  • the cut portion 32 is cut from the product portion 31 by press cutting.
  • a general press processing apparatus (not shown) for performing a shearing process is used. The outline will be described.
  • the press working apparatus has a lower support tool for supporting the trimmed part 30 and an upper work tool having a cutting blade. With the upper processing tool spaced apart from the lower support tool, the trimmed part 30 is set on the lower support tool, and then the upper processing tool is approached toward the lower support tool so that the cut portion 32 is removed from the product portion 31. Resect.
  • the trimming process has two stages of a pre-stage press cutting process (pre-stage process) and a post-stage press cutting process (post-stage process). By this two-stage process, the excision portion 32 is excised in two stages.
  • the first excision portion 33 extending in the longitudinal direction on both sides of the product portion 31 in the short direction is excised from the excision portion 32.
  • a cutting line for excising the first excision portion 33 is defined as a first cutting line L1 as shown in FIG. 3A.
  • a cutting line for cutting the second cut portion 34 is a second cutting line L2 as shown in FIGS. 3A and 3B.
  • the first cutting line L1 and the second cutting line L2 are set to partially intersect each other. Is done. If the part where both the lines L1 and L2 intersect is a connecting part 26, a matching 25 is formed in the connecting part 26 in order to prevent a processing error between the preceding process and the subsequent process. As shown in FIG. 3C in an enlarged manner with respect to a part of the connecting portion 26a (upper right portion of FIG. 3B), the matching 25 is formed to be concave by the first cutting line L1.
  • the second cutting line L ⁇ b> 2 is extended to reach the opening portion of the matching 25.
  • the door impact beam 10 in which a pair of matching 25 is provided on the left and right edge portions 23 and 24 is obtained. And the door impact beam 10 is suitably manufactured by said manufacturing method.
  • performance evaluation was performed on examples of the door impact beam 10 of the present embodiment.
  • this indication is not limited to this Example.
  • the performance of the comparative examples was evaluated in the same manner.
  • the performance evaluation was performed by a method of evaluating the magnitude of the reaction force of the door impact beam with respect to the vertical load using the three-point bending test apparatus 40.
  • the three-point bending test apparatus 40 has a pair of struts 41 spaced apart by 800 mm, and a pressing tool 42 provided at the upper center of both struts 41.
  • the front end portions of the support column 41 and the pressing tool 42 are formed in an arc shape, the radius of the front end portion R1 of the support column 41 is 25 mm, and the radius of the front end portion R2 of the pressing tool 42 is 150 mm.
  • the door impact beam to be evaluated T is bridged between the both columns 41 so that the central portion of the main body 11 is disposed at the center of both columns 41. Then, a vertical load is applied from the top to the bottom of the central portion (pressing point) of the measurement object using the pressing tool 42.
  • Example 1 the door impact beam 10 formed of a high-tensile steel plate having a tensile strength TS of 1800 MPa and provided with matching 25 on the left and right edge portions 23 and 24 (short side portions) was used.
  • the door impact beam 10 formed of a high-tensile steel plate having a tensile strength TS of 2000 MPa and provided with matching 25 on the left and right edge portions 23 and 24 (short side portions) was used.
  • the tensile strength TS is formed from a high-tensile steel plate having a tensile strength TS of 1800 MPa as in Example 1.
  • the upper edge portion 11a and the lower edge portion 11b ( What was formed in the long side part) was used.
  • the tensile strength TS is formed of a high-tensile steel plate having a tensile strength TS of 2000 MPa as in Example 2.
  • the upper edge portion 11a and the lower edge portion 11b ( What was formed in the long side part) was used.
  • Comparative Example 3 and Comparative Example 4 were formed of a high-tensile steel plate having a tensile strength TS of 1500 MPa, and provided with matching 25 on the long side portion and the short side portion, respectively.
  • the matching 25 is provided in the long side portion as Comparative Example 3
  • the matching 25 is provided in the short side portion as Comparative Example 4.
  • FIGS. 5 to 7 show graphs showing the results of performance evaluation performed for each of Examples 1 and 2 and Comparative Examples 1 to 4, respectively. These drawings show the relationship between the magnitude (load) of the reaction force of the door impact beam with respect to the vertical load and the pushing amount (stroke) with respect to the door impact beam at the pressing point.
  • the graph shown in FIG. 5 shows the performance characteristics of Comparative Example 3 and Comparative Example 4, the graph of Comparative Example 3 is indicated by C3, and the graph of Comparative Example 4 is indicated by C4.
  • the graph shown in FIG. 6 shows the performance characteristics of Example 1 and Comparative Example 1. In the figure, the graph of Example 1 is indicated by E1, and the graph of Comparative Example 1 is indicated by C1.
  • the graph shown in FIG. 7 shows the performance characteristics of Example 2 and Comparative Example 2. In the figure, the graph of Example 2 is indicated by E2, and the graph of Comparative Example 2 is indicated by C2.
  • Example 1 using a high-tensile steel plate having a tensile strength TS of 1800 MPa, the collision energy absorption performance can be stably maintained even if the deformation amount of the main body 11 increases during a side collision.
  • Example 2 compared with Example 1, the maximum value of the load increased to 21.7 KN due to the increase in tensile strength, and the relationship between the load and the stroke showed the same tendency as in Example 1. Therefore, even in Example 2 using a steel plate having a tensile strength TS of 2000 MPa, the collision energy absorption performance can be stably maintained.
  • the door impact beam 10 of the present embodiment is provided with the matching 25 on the short sides of the left and right end edges 23 and 24 instead of the upper and lower edges 11a and 11b of the main body 11. Therefore, even if the deformation amount of the main body 11 increases at the time of a side collision, the performance of absorbing the collision energy can be stably maintained without sharply decreasing. This effect becomes prominent when a high-tensile steel plate having a tensile strength in the range of 1800 MPa to 2000 MPa is used as a material for forming the door impact beam 10.
  • the door impact beam 10 and the manufacturing method thereof are not limited to the configuration described in the above embodiment, and may be implemented as follows, for example.
  • FIG. 1A In the door impact beam 10, the shape shown in FIG. 1A is merely an example of a general shape. Other shapes such as a shape in which the bulging portion 22 has one hat shape and a shape in which the pair of bulging portions 22 are partially expanded in the lateral direction may be used.
  • the matching 25 provided on the left and right edge portions 23, 24 may be one or may be three or more.
  • the matching 25 can be changed depending on how to set the cutting location at each stage when performing a plurality of stages of cutting.
  • the shape of the matching 25 is not a quadrangular shape as in the above embodiment, but may be a triangular shape or other angular shape, or a shape other than a square shape such as an arc shape. Good.
  • the door impact beam 10 may be one in which a concave portion such as a matching 25 formed to undergo a plurality of stages of cutting is not provided in the entire outer edge portion. Even in this configuration, as in the case of the door impact beam 10 in which concave portions such as matching 25 are provided in the left and right edge portions 23 and 24, a concave portion where local stress is concentrated is not provided in the long side portion. Energy absorption performance can be stably maintained.
  • laser cutting processing may be adopted instead of press cutting processing for at least one of the front stage processing and the rear stage processing.
  • a laser processing mark 29 is formed.
  • the laser processing mark 29 has a concave shape like the matching 25. Note that such a laser processing mark 29 is formed in place of the matching 25 not only in the enlarged portion shown in FIG. 1B but also in all portions where the matching 25 is provided.
  • a pierce mark recess may be formed as a laser processing mark 29 on the outer edge due to piercing at the beginning of cutting.
  • the laser cutting start mark or laser that is recessed inward from the cutting line by laser irradiation at the cutting start point or cutting end point.
  • a laser processing mark 29 is formed as a cutting end mark. Therefore, by providing the connecting portions 26 at the left and right edge portions 23 and 24, the door impact beam 10 in which the concave laser processing marks 29 are provided at the left and right edge portions 23 and 24 can be obtained.
  • the trimming process described in the above embodiment is not essential, and a method without the trimming process may be adopted.
  • the pre-processing and post-processing by press cutting as described above are applied. May be.
  • laser cutting may be employed instead of press cutting in at least one of the pre-stage processing and the post-stage processing.
  • the cut portion 32 is cut out through three or more steps instead of cutting in two steps as in the above embodiment. You may do it. However, even in this case, the cutting line is set so that the matching 25 is formed on the left and right edge portions 23 and 24 as in the above embodiment.
  • this manufacturing method of another embodiment also has a pre-stage press cutting process (pre-stage process) and a post-stage press cutting process (post-stage process).
  • pre-stage process a pre-stage press cutting process
  • post-stage process a post-stage press cutting process
  • the cut portion 32 of the trimmed component 30 shown in FIG. 8A is cut in two stages.
  • FIG. 8B the first excision portion 33 is excised by excision by the pre-stage processing, and the second excision portion 34 is excised by the post-stage processing, as in the above embodiment.
  • the shape of the second excision portion 34 remaining after the excavation is different from that of the above embodiment.
  • the door impact beam 10 has upper and lower edges 12 a and 12 b in the bracket portion 12 and corners 27 formed by left and right end edges 23 and 24.
  • Each of the corner portions 27 has an arc shape having a predetermined radius.
  • the connection part 28 where the 1st cutting line L1 and the 2nd cutting line L2 cross is set in the location in which this each corner
  • the first cutting line L1 is set along the upper and lower edges 11a and 11b in the main body 11 and the upper and lower edges 12a and 12b in the bracket section 12.
  • the first cutting line L1 in the joint portion 28 is an enlargement of the corner portion 27 formed by the front stage and the rear stage processing, as shown in FIG. 8C in an enlarged manner with respect to a part of the joint portion 28a (upper right portion in FIGS. 8A and 8B). It is set to extend along a radius along a straight line. As shown in FIGS. 8B and 8C, a part of the corner portion 27 is cut off from the upper and lower edges 11 a and 11 b of the main body 11 to the upper and lower edges 12 a and 12 b of the bracket 12.
  • a second cutting line L2 is set that extends along the left and right edge portions 23 and 24 formed by the post-process and extends in a straight line along the radius of the corner 27.
  • Means 1 A method of manufacturing a body part having a long shape, A first step of cutting a steel sheet through a plurality of stages including a plurality of stages of punching or laser cutting; A second step of forming the steel plate obtained in the first step into a hat shape; With In the first step, a connecting portion where the first cutting line in the pre-stage machining and the second line in the post-stage machining intersect is set in a portion that becomes the short side portion of the vehicle body part in the outer edge formed by the step. Manufacturing method for car body parts.
  • the manufacturing method of the means 1 there is obtained a vehicle body part in which matching formed with a plurality of stages of cutting and laser processing marks formed with laser irradiation are provided on the short side of the outer edge. . Because the matching and laser processing traces are provided on the short side, unlike the configuration where the matching and laser processing traces are provided on the long side, stress is concentrated on the matching and laser processing traces at the time of side collision. The collision energy absorption performance can be stably maintained.
  • Mean 2 A method of manufacturing a body part having a long shape, A first step of cutting a steel sheet through a plurality of stages including a plurality of stages of punching or laser cutting; A second step of forming the steel plate obtained in the first step into a hat shape; With In the first step, the first cutting line in the pre-stage machining and the second cut in the post-stage machining are formed at the corners where the long side portion and the short side portion of the body part intersect in the outer edge portion formed by the step. A method of manufacturing a vehicle body part in which a connecting portion where the line intersects is set.
  • the manufacturing method of the means 2 there can be obtained a vehicle body part which is not provided with matching formed in a plurality of stages of cutting and laser processing traces formed by cutting by laser irradiation.
  • matching and laser processing traces are provided on the long sides of the body parts, it avoids stress concentration on the matching and laser processing traces at the time of a side collision and stabilizes the collision energy absorption performance. Can be maintained.
  • Means 3 The method for manufacturing a vehicle body part according to means 1 or 2, wherein the vehicle body part is formed of a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa, and the high-tensile steel plate is cut in the step.
  • the sudden decrease in the collision energy absorption performance caused by the matching and laser processing marks being provided on the long side portion occurs when a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa is used. Therefore, according to the manufacturing method of the means 3, when a vehicle body part is manufactured by the manufacturing method of the means 1 or 2 using the high-tensile steel plate in this range, the effect that the collision energy absorption performance can be stably maintained is become prominent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

A door impact beam, which is a vehicle body component, is formed in such a way as to have an elongated shape, and includes a hat-shaped main body portion. A pair of matchings are provided in each of a right end edge portion and a left end edge portion of an outer edge portion of the door impact beam. The matchings are formed in a linking portion where a first cutting line in an upstream process and a second cutting line in a downstream process intersect, in a manufacturing stage for manufacturing the door impact beam through a plurality of stages of punching.

Description

車体部品Body parts 関連出願の相互参照Cross-reference of related applications
　本出願は、２０１８年３月２９日に出願された日本出願番号２０１８－６６０１９号に基づくもので、ここにその記載内容を援用する。 This application is based on Japanese Patent Application No. 2018-66019 filed on March 29, 2018, the contents of which are incorporated herein by reference.
　本開示は、自動車等の車両の車体部品に関するものである。 This disclosure relates to body parts of vehicles such as automobiles.
　自動車等の車両において、その車体に用いられる車体部品として、例えば骨格部品や補強部品が知られている。補強部品は車両の操縦安定性、振動抑制、騒音抑制、衝突時の変形抑制等のため、骨格の強度を補強するものである。 In vehicles such as automobiles, for example, framework parts and reinforcing parts are known as body parts used for the vehicle body. Reinforcing parts reinforce the strength of the skeleton for vehicle handling stability, vibration suppression, noise suppression, deformation suppression at the time of collision, and the like.
　車体部品を製造する場合、金属製板材に対する切断加工によってブランク材を得る工程と、当該ブランク材を所定の形状に成形する工程とを経る。また、成形後に、トリミングを行う工程を経ることもある。ブランク材を得る工程やトリミングを行う工程では、複数段階のプレス切断加工がされたり、プレス切断加工とレーザ切断加工とが組み合わされたりすることが一般的である。その場合、前段加工における切断ラインと後段加工における切断ラインとが交わるつなぎ部には、凹状をなす加工痕が形成される。複数段階のプレス切断加工が行われる場合、この加工痕は一般にマッチングと呼ばれる。加工痕は、前段加工と後段加工との加工誤差によって部品の外縁部に段差が生じることを防ぐために形成される。従前、長尺状をなす車体部品では、加工痕は外縁部のうちの長辺部分に形成されていた（例えば、特許文献１参照）。 When manufacturing a vehicle body part, it passes through the process of obtaining a blank material by the cutting process with respect to a metal plate material, and the process of shape | molding the said blank material in a defined shape. Further, a trimming process may be performed after molding. In the process of obtaining a blank material and the process of trimming, it is common to perform a plurality of stages of press cutting or to combine press cutting and laser cutting. In that case, a processing mark having a concave shape is formed at a connecting portion where the cutting line in the former stage processing and the cutting line in the latter stage machining intersect. When multiple stages of press cutting are performed, this processing trace is generally called matching. The machining trace is formed in order to prevent a step from being generated in the outer edge portion of the component due to a machining error between the former stage machining and the latter stage machining. Conventionally, in a vehicle body part having a long shape, a processing mark is formed on a long side portion of an outer edge portion (see, for example, Patent Document 1).
特開２０１６－１０１６０４号公報JP 2016-101604 A
　凹状をなす加工痕が長辺部に形成されている構成において、衝突等によって車体部品に外力が作用すると、加工痕に応力が集中する。そのため、部品材料として引張り強度が比較的高い高張力鋼板を使用したり、熱間プレス加工による成形方法を採用したりして車体部品の強度を向上させても、加工痕が設けられているために、十分な衝突エネルギー吸収性能を安定的に維持することができない。 In the configuration in which the concave machining trace is formed on the long side, when an external force acts on the vehicle body part due to a collision or the like, stress concentrates on the machining trace. Therefore, even if the strength of the car body parts is improved by using a high-tensile steel plate with a relatively high tensile strength as a component material or by adopting a forming method by hot pressing, the processing marks are provided. In addition, sufficient impact energy absorption performance cannot be stably maintained.
　そこで、本開示は、複数段階の切断加工によって形成される加工痕が外縁部に形成されていても、衝突エネルギー吸収性能を安定的に維持することができる車体部品を得ることを主たる目的とする。 Therefore, the main object of the present disclosure is to obtain a vehicle body part that can stably maintain the collision energy absorption performance even if the processing mark formed by the multi-step cutting process is formed on the outer edge portion. .
　上記課題を解決すべく、第１の態様の車体部品は、長尺状に形成された車体部品であって、長手方向に延びるハット部と、複数段階の打ち抜き加工による製造時において外縁部のうち短辺部に形成されたマッチングと、を有する。 In order to solve the above-mentioned problem, the vehicle body part of the first aspect is a vehicle body part formed in a long shape, and includes a hat part extending in the longitudinal direction and an outer edge part at the time of manufacturing by multi-stage punching. And matching formed on the short side.
　第２の態様の車体部品は、長尺状に形成された車体部品であって、長手方向に延びるハット部と、レーザ切断加工を含む複数段階の切断加工による製造時において外縁部のうち短辺部に形成されたレーザ加工痕と、を有する。 The vehicle body part according to the second aspect is a vehicle body part formed in an elongated shape, and has a hat part extending in the longitudinal direction, and a short side of the outer edge part at the time of manufacturing by multi-stage cutting including laser cutting Laser processing marks formed on the portion.
　第３の態様の車体部品は、引張強度が１６００ＭＰａ～２１００ＭＰａの高張力鋼板により形成されている。 The vehicle body component according to the third aspect is formed of a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa.
　第１の態様の車体部品によれば、長辺部ではなく短辺部にマッチングが設けられているため、衝突等による外力が車体部品に作用しても、マッチングに応力が集中することが回避される。これにより、衝突等の外力が車体部品に作用しても、車体部品の衝突エネルギー吸収性能が急激に低下することなく当該性能を安定的に維持することができる。 According to the vehicle body component of the first aspect, since matching is provided not on the long side portion but on the short side portion, even if an external force due to a collision or the like acts on the vehicle body component, stress is not concentrated on the matching. Is done. As a result, even if an external force such as a collision is applied to the vehicle body part, the performance of the vehicle body part can be stably maintained without a sudden decrease in the collision energy absorption performance.
　第２の態様の車体部品によれば、長辺部ではなく短辺部にレーザ加工痕が設けられている。レーザ加工痕とは、例えば、レーザ照射によるピアス痕、レーザ切断開始痕、レーザ切断終了痕等のレーザ切断加工に伴う痕跡であり、車体部品の外縁部において凹状をなすように形成されている。凹状をなすレーザ加工痕が短辺部に設けられているため、衝突等による外力が車体部品に作用しても、この凹状部分に応力が集中することが回避される。これにより、衝突等の外力が車体部品に作用しても、衝突エネルギー吸収性能が急激に低下することなく安定的に維持することができる。 According to the vehicle body part of the second aspect, the laser processing trace is provided on the short side instead of the long side. The laser processing trace is a trace accompanying laser cutting processing such as a piercing mark, a laser cutting start mark, and a laser cutting end mark due to laser irradiation, and is formed in a concave shape at the outer edge of the vehicle body part. Since the concave laser processing trace is provided on the short side portion, even if an external force due to a collision or the like acts on the vehicle body part, it is avoided that stress is concentrated on the concave portion. As a result, even if an external force such as a collision acts on the vehicle body part, the collision energy absorption performance can be stably maintained without sharply decreasing.
　マッチングやレーザ加工による痕跡が車体部品の長辺部に設けられた場合に、当該マッチングに対して応力が集中することによって生じる車体部品の衝突エネルギー吸収性能の急激な低下は、引張強度が１６００ＭＰａ～２１００ＭＰａの高張力鋼板を用いた場合に生じる。そのため、第３の態様では、この範囲の引張強度を有する高張力鋼板が用いられているため、車体部品の衝突エネルギー吸収性能を安定的に維持できるという効果は顕著となる。 When traces due to matching or laser processing are provided on the long side of the vehicle body part, the sudden drop in the collision energy absorption performance of the vehicle body part caused by the concentration of stress on the matching is a tensile strength of 1600 MPa or more. This occurs when a 2100 MPa high-tensile steel plate is used. For this reason, in the third aspect, since a high-tensile steel sheet having a tensile strength in this range is used, the effect of stably maintaining the collision energy absorption performance of the vehicle body part becomes remarkable.
　本開示についての上記目的およびその他の目的、特徴や利点は、添付の図面を参照しながら下記の詳細な記述により、より明確となる。
ドアインパクトビームを示す平面図。 図１Ａの右上側に位置するつなぎ部の拡大図。 図１におけるＩＩ－ＩＩ断面図。 ドアインパクトビームの製造方法の概略を説明する説明図。 性能評価試験装置の概要を示す図。 比較例３及び比較例４の性能特性を示すグラフ。 実施例１及び比較例１の性能特性を対比して示すグラフ。 実施例２及び比較例２の性能特性を対比して示すグラフ。 ドアインパクトビームを製造する別形態の製造方法の概略を説明する説明図。 The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.
The top view which shows a door impact beam. The enlarged view of the connection part located in the upper right side of FIG. 1A. II-II sectional drawing in FIG. Explanatory drawing explaining the outline of the manufacturing method of a door impact beam. The figure which shows the outline | summary of a performance evaluation test apparatus. The graph which shows the performance characteristic of the comparative example 3 and the comparative example 4. FIG. The graph which compares and shows the performance characteristic of Example 1 and Comparative Example 1. FIG. The graph which compares and shows the performance characteristic of Example 2 and Comparative Example 2. FIG. Explanatory drawing explaining the outline of the manufacturing method of another form which manufactures a door impact beam.
　以下、本開示を具体化した一実施の形態について、図面を参照しながら説明する。 Hereinafter, an embodiment embodying the present disclosure will be described with reference to the drawings.
　本実施形態の車体部品は、自動車等の車両における骨格部品であるドアインパクトビームとして具体化されている。なお、これ以外の骨格部品や補強部品等の車体部品であってもよく、他の適用例としては、バンパーリンフォース、アンダーランプロテクタ、クロスメンバ、フロアーリンフォース、ベルトラインリンフォース、ルーフリンフォース、サイドシル等がある。 The vehicle body part of the present embodiment is embodied as a door impact beam which is a skeleton part in a vehicle such as an automobile. Other body parts such as frame parts and reinforcement parts may be used. Other application examples include bumper reinforcement, under-run protector, cross member, floor reinforcement, beltline reinforcement, roof reinforcement. And side sills.
　（ドアインパクトビームの構成）
　はじめに、ドアインパクトビームの構成について説明する。図１Ａは、ドアインパクトビーム１０を示している。ドアインパクトビーム１０は、引張強度ＴＳが１６００ＭＰａ以上、好ましくは１８００ＭＰａとなる高張力鋼板が用いられ、プレス加工によって成形されている。図１Ａに示すように、ドアインパクトビーム１０は、全体として左右方向に延びる長尺状をなし、その長手方向に延びる本体部１１を備えている。なお、上下左右は図１Ａに示す平面図を基準とし、これ以降の説明でも同様とする。 (Structure of door impact beam)
First, the configuration of the door impact beam will be described. FIG. 1A shows a door impact beam 10. The door impact beam 10 is made of a high-tensile steel plate having a tensile strength TS of 1600 MPa or more, preferably 1800 MPa, and is formed by pressing. As shown in FIG. 1A, the door impact beam 10 has a long shape extending in the left-right direction as a whole, and includes a main body 11 extending in the longitudinal direction. Note that the top, bottom, left, and right are based on the plan view shown in FIG. 1A, and the same applies to the following description.
　本体部１１は、図１Ａ及び図２に示すように、長手方向に沿ってハット形状をなすように形成され、一対の膨出部２２を有している。本体部１１はハット部に相当する。膨出部２２が設けられた部分では、波形の断面形状を有している。膨出部２２の上下両側には、それぞれフランジ部２１が設けられている。膨出部２２及びフランジ部２１が設けられた形状によって、本体部１１の強度が高められている。 As shown in FIGS. 1A and 2, the main body 11 is formed in a hat shape along the longitudinal direction, and has a pair of bulging portions 22. The main body portion 11 corresponds to a hat portion. The portion where the bulging portion 22 is provided has a corrugated cross-sectional shape. Flange portions 21 are provided on both upper and lower sides of the bulging portion 22. The strength of the main body 11 is enhanced by the shape in which the bulging portion 22 and the flange portion 21 are provided.
　本体部１１の左右両端部には、ブラケット部１２が設けられている。ブラケット部１２には、ドアインパクトビーム１０を車体に組み付けるための取付け部（図示略）が設けられている。ブラケット部１２の右端縁部２３及び左端縁部２４には、それぞれに一対のマッチング２５が設けられている。 Bracket portions 12 are provided at both left and right ends of the main body portion 11. The bracket portion 12 is provided with an attachment portion (not shown) for assembling the door impact beam 10 to the vehicle body. A pair of matching 25 is provided in each of the right end edge portion 23 and the left end edge portion 24 of the bracket portion 12.
　なお、ドアインパクトビーム１０の外縁部は、本体部１１の上縁部１１ａ及び下縁部１１ｂと、ブラケット部１２の上縁部１２ａ及び下縁部１２ｂと、ブラケット部１２の右端縁部２３及び左端縁部２４とよりなる。そのうち、ブラケット部１２の右端縁部２３及び左端縁部２４がそれぞれ短辺部に相当する。 The outer edge portion of the door impact beam 10 includes an upper edge portion 11a and a lower edge portion 11b of the main body portion 11, an upper edge portion 12a and a lower edge portion 12b of the bracket portion 12, and a right end edge portion 23 of the bracket portion 12. It consists of a left edge 24. Among them, the right end edge portion 23 and the left end edge portion 24 of the bracket portion 12 correspond to short side portions, respectively.
　複数段階のプレス切断加工される工程を経てドアインパクトビーム１０が製造されることから、前段加工と後段加工との加工誤差によって右端縁部２３及び左端縁部２４に段差が生じることを防ぐため、マッチング２５が形成されている。マッチング２５は、図１Ｂに拡大して示すように、四角形状をなす凹状に形成されている。 Since the door impact beam 10 is manufactured through a multi-stage press cutting process, in order to prevent the right end edge portion 23 and the left end edge portion 24 from being stepped due to a processing error between the front stage processing and the rear stage processing, A matching 25 is formed. The matching 25 is formed in a concave shape having a quadrangular shape as shown in an enlarged view in FIG. 1B.
　（ドアインパクトビームの製造方法）
　次に、本実施形態のドアインパクトビーム１０の製造方法について、図３を参照しながら説明する。 (Door impact beam manufacturing method)
Next, the manufacturing method of the door impact beam 10 of this embodiment is demonstrated, referring FIG.
　なお、ドアインパクトビーム１０のような車体部品を製造する製造方法としては、背景技術において説明したように、金属製板材に対する切断加工によってブランク材を得る工程と、当該ブランク材を所定の形状に成形する工程とを有する。本実施形態のドアインパクトビーム１０は、この２つの工程の他に、成形後のトリミングを行う工程を有している。そして、このトリミング工程において複数段階のプレス切断加工がされ、その際に、マッチング２５が形成される。以下では、マッチング２５が形成されるトリミング工程について説明する。 In addition, as described in the background art, as a manufacturing method for manufacturing a vehicle body part such as the door impact beam 10, a process of obtaining a blank material by cutting a metal plate material, and forming the blank material into a predetermined shape The process of carrying out. The door impact beam 10 of the present embodiment has a process of performing trimming after molding in addition to these two processes. In this trimming process, a plurality of stages of press cutting are performed, and matching 25 is formed at that time. Hereinafter, the trimming process in which the matching 25 is formed will be described.
　トリミング工程に至る前の製造工程において、図３Ａに示すように、トリミングよってドアインパクトビーム１０を得る前の被トリム部品３０が形成されている。被トリム部品３０は、ブランク材が熱間プレス加工されることにより形成され、ドアインパクトビーム１０となる製品部分３１と切除部分３２とを有している。なお、本実施形態の製造方法における熱間プレス加工には、ダイクエンチ工法が採用されている。ダイクエンチ工法とは、鋼板を例えば８００℃～１１００℃まで加熱し、その高温状態でプレス成形することにより、相対的に低温の金型によって成形と同時に急冷による焼入れを行う工法である。この工法により、素材となる鋼板の引張強度を向上させることができる。この工法が採用されていることにより、ドアインパクトビーム１０は、引張強度が１６００ＭＰａ、好ましくは１８００ＭＰａ以上となる高張力鋼板によって形成される。 In the manufacturing process before the trimming process, as shown in FIG. 3A, the trimmed part 30 before the door impact beam 10 is obtained by trimming is formed. The to-be-trimmed part 30 is formed by hot-pressing a blank material, and has a product portion 31 and a cut-out portion 32 to be the door impact beam 10. In addition, the die quench method is employ | adopted for the hot press work in the manufacturing method of this embodiment. The die quench method is a method in which a steel sheet is heated to, for example, 800 ° C. to 1100 ° C. and press-molded at a high temperature to perform quenching by quenching at the same time as molding with a relatively low temperature mold. By this construction method, the tensile strength of the steel plate used as a raw material can be improved. By adopting this construction method, the door impact beam 10 is formed of a high-tensile steel plate having a tensile strength of 1600 MPa, preferably 1800 MPa or more.
　トリミング工程では、プレス切断加工によって製品部分３１から切除部分３２を切断する。プレス切断加工を行う装置は、せん断加工を行う一般的なプレス加工装置（図示略）が用いられる。概要を説明すると、当該プレス加工装置は、被トリム部品３０を支持する下側支持具と、切断刃を有する上側加工具とを有している。上側加工具が下側支持具から離間した状態で被トリム部品３０を下側支持具にセットし、その後、上側加工具を下側支持具に向けて接近させて切除部分３２を製品部分３１から切除する。 In the trimming process, the cut portion 32 is cut from the product portion 31 by press cutting. As an apparatus for performing the press cutting process, a general press processing apparatus (not shown) for performing a shearing process is used. The outline will be described. The press working apparatus has a lower support tool for supporting the trimmed part 30 and an upper work tool having a cutting blade. With the upper processing tool spaced apart from the lower support tool, the trimmed part 30 is set on the lower support tool, and then the upper processing tool is approached toward the lower support tool so that the cut portion 32 is removed from the product portion 31. Resect.
　トリミング工程は、前段階のプレス切断加工工程（前段加工）と、後段階のプレス切断加工工程（後段加工）との２段階の工程を有している。この２段階の工程により、切除部分３２を２段階に分けて切除する。 The trimming process has two stages of a pre-stage press cutting process (pre-stage process) and a post-stage press cutting process (post-stage process). By this two-stage process, the excision portion 32 is excised in two stages.
　図３Ａ及び図３Ｂに示すように、前段加工による切除では、切除部分３２のうち、製品部分３１の短手方向の両側で長手方向に延びる第１切除部分３３を切除する。第１切除部分３３の切除を行う切断ラインを、図３Ａに示すように第１切断ラインＬ１とする。この切除により、ドアインパクトビーム１０の上側では、本体部１１の上縁部１１ａからブラケット部１２の上縁部１２ａを経て左右の端縁部２３，２４の上側端部２３ａ，２４ａに至るまでが切除される。同様に、下側では、本体部１１の下縁部１１ｂからブラケット部１２の下縁部１２ｂを経て左右の端縁部２３，２４の下側端部２３ｂ，２４ｂに至るまでが切除される。前段加工を終えた段階では、図３Ｂに示すように、左右の端縁部２３，２４には、第２切除部分３４が残されている。 As shown in FIGS. 3A and 3B, in the excision by the pre-stage processing, the first excision portion 33 extending in the longitudinal direction on both sides of the product portion 31 in the short direction is excised from the excision portion 32. A cutting line for excising the first excision portion 33 is defined as a first cutting line L1 as shown in FIG. 3A. By this excision, from the upper edge portion 11a of the main body portion 11 to the upper end portions 23a and 24a of the left and right end edge portions 23 and 24 through the upper edge portion 12a of the bracket portion 12 on the upper side of the door impact beam 10. Excised. Similarly, on the lower side, from the lower edge part 11b of the main body part 11 to the lower side edge parts 23b and 24b of the left and right end edge parts 23 and 24 through the lower edge part 12b of the bracket part 12 is cut off. At the stage where the pre-stage processing is completed, as shown in FIG. 3B, the second cut portions 34 are left on the left and right edge portions 23 and 24.
　次いで、後工程による切除では、切除部分３２のうち第２切除部分３４を切除する。この第２切除部分３４の切除を行う切断ラインを、図３Ａ及び図３Ｂに示すように第２切断ラインＬ２とする。この切除により、ドアインパクトビーム１０の左右の端縁部２３，２４では、前段加工によって切断されずに残っていた部分が切除される。その結果、切除部分３２がすべて切除されて製品部分３１が残り、ドアインパクトビーム１０が得られる。 Next, in the excision in the subsequent process, the second excision portion 34 of the excision portion 32 is excised. A cutting line for cutting the second cut portion 34 is a second cutting line L2 as shown in FIGS. 3A and 3B. By this excision, the left and right end edge portions 23 and 24 of the door impact beam 10 are excised without remaining cut by the former processing. As a result, the cut portion 32 is completely cut away, and the product portion 31 remains, and the door impact beam 10 is obtained.
　ここで、前段加工と後段加工とで未切断の箇所が生じることを防ぐため、図３Ａに示すように、第１切断ラインＬ１と第２切断ラインＬ２とは、一部において互いに交わるように設定される。この両ラインＬ１，Ｌ２が交わった部分をつなぎ部２６とすると、つなぎ部２６には、前段加工と後段加工との加工誤差を防ぐため、マッチング２５が形成される。図３Ｃに一部のつなぎ部２６ａ（図３Ｂの右上部分）について拡大して示すように、マッチング２５は、第１切断ラインＬ１によって凹状をなすように形成される。第２切断ラインＬ２は、マッチング２５の開口部分に至るまで延長されている。 Here, in order to prevent an uncut portion from being generated in the former stage process and the latter stage process, as shown in FIG. 3A, the first cutting line L1 and the second cutting line L2 are set to partially intersect each other. Is done. If the part where both the lines L1 and L2 intersect is a connecting part 26, a matching 25 is formed in the connecting part 26 in order to prevent a processing error between the preceding process and the subsequent process. As shown in FIG. 3C in an enlarged manner with respect to a part of the connecting portion 26a (upper right portion of FIG. 3B), the matching 25 is formed to be concave by the first cutting line L1. The second cutting line L <b> 2 is extended to reach the opening portion of the matching 25.
　このような前段加工及び後段加工を経て切除部分３２が切除されるため、左右の端縁部２３，２４にそれぞれ一対のマッチング２５が設けられたドアインパクトビーム１０が得られる。そして、ドアインパクトビーム１０は、上記の製造方法によって好適に製造される。 Since the excision portion 32 is excised through such pre-processing and post-processing, the door impact beam 10 in which a pair of matching 25 is provided on the left and right edge portions 23 and 24 is obtained. And the door impact beam 10 is suitably manufactured by said manufacturing method.
　次に、本実施形態のドアインパクトビーム１０の実施例について、性能評価を行った。なお、本開示はこの実施例に限定されない。実施例との比較のため、比較例についても同様に性能評価を行った。性能評価は、三点曲げ試験装置４０を用いて、垂直荷重に対するドアインパクトビームの反力の大きさを評価する方法によって行った。 Next, performance evaluation was performed on examples of the door impact beam 10 of the present embodiment. In addition, this indication is not limited to this Example. For comparison with the examples, the performance of the comparative examples was evaluated in the same manner. The performance evaluation was performed by a method of evaluating the magnitude of the reaction force of the door impact beam with respect to the vertical load using the three-point bending test apparatus 40.
　図４に示すように、三点曲げ試験装置４０は、８００ｍｍの間隔を隔てた一対の支柱４１と、両支柱４１の中央上方に設けられた押圧具４２とを有している。支柱４１及び押圧具４２のそれぞれの先端部は弧状をなすように形成されており、支柱４１の先端部Ｒ１の半径は２５ｍｍ、押圧具４２の先端部Ｒ２の半径は１５０ｍｍとなっている。試験時には、両支柱４１の間に、評価対象Ｔとなるドアインパクトビームを、両支柱４１の中央部に本体部１１の中心部が配置されるように架け渡す。その上で、押圧具４２を用いて測定対象の中心部（押圧点）に上から下へ垂直荷重をかける。 As shown in FIG. 4, the three-point bending test apparatus 40 has a pair of struts 41 spaced apart by 800 mm, and a pressing tool 42 provided at the upper center of both struts 41. The front end portions of the support column 41 and the pressing tool 42 are formed in an arc shape, the radius of the front end portion R1 of the support column 41 is 25 mm, and the radius of the front end portion R2 of the pressing tool 42 is 150 mm. At the time of the test, the door impact beam to be evaluated T is bridged between the both columns 41 so that the central portion of the main body 11 is disposed at the center of both columns 41. Then, a vertical load is applied from the top to the bottom of the central portion (pressing point) of the measurement object using the pressing tool 42.
　実施例１として、引張強度ＴＳが１８００ＭＰａの高張力鋼板によって形成されるとともに、左右の端縁部２３，２４（短辺部）にマッチング２５が設けられたドアインパクトビーム１０を用いた。 As Example 1, the door impact beam 10 formed of a high-tensile steel plate having a tensile strength TS of 1800 MPa and provided with matching 25 on the left and right edge portions 23 and 24 (short side portions) was used.
　実施例２として、引張強度ＴＳが２０００ＭＰａの高張力鋼板によって形成されるとともに、左右の端縁部２３，２４（短辺部）にマッチング２５が設けられたドアインパクトビーム１０を用いた。 As Example 2, the door impact beam 10 formed of a high-tensile steel plate having a tensile strength TS of 2000 MPa and provided with matching 25 on the left and right edge portions 23 and 24 (short side portions) was used.
　比較例１として、実施例１と同じく引張強度ＴＳが１８００ＭＰａの高張力鋼板によって形成されている一方で、マッチング２５については、従来技術と同じく本体部１１の上縁部１１ａ及び下縁部１１ｂ（長辺部）に形成されたものを用いた。 As Comparative Example 1, the tensile strength TS is formed from a high-tensile steel plate having a tensile strength TS of 1800 MPa as in Example 1. On the other hand, for matching 25, the upper edge portion 11a and the lower edge portion 11b ( What was formed in the long side part) was used.
　比較例２として、実施例２と同じく引張強度ＴＳが２０００ＭＰａの高張力鋼板によって形成されている一方で、マッチング２５については、従来技術と同じく本体部１１の上縁部１１ａ及び下縁部１１ｂ（長辺部）に形成されたものを用いた。 As Comparative Example 2, the tensile strength TS is formed of a high-tensile steel plate having a tensile strength TS of 2000 MPa as in Example 2. On the other hand, for matching 25, the upper edge portion 11a and the lower edge portion 11b ( What was formed in the long side part) was used.
　比較例３及び比較例４は、引張強度ＴＳが１５００ＭＰａの高張力鋼板によって形成されるとともに、長辺部及び短辺部にそれぞれマッチング２５が設けられたものを用いた。このうち、マッチング２５が長辺部に設けられたものを比較例３とし、短辺部に設けられたものを比較例４とした。 Comparative Example 3 and Comparative Example 4 were formed of a high-tensile steel plate having a tensile strength TS of 1500 MPa, and provided with matching 25 on the long side portion and the short side portion, respectively. Among these, the matching 25 is provided in the long side portion as Comparative Example 3, and the matching 25 is provided in the short side portion as Comparative Example 4.
　上記実施例１，２及び比較例１～４のそれぞれについて行った性能評価の結果を示すグラフを図５～図７に示す。これらの図は、垂直荷重に対するドアインパクトビームの反力の大きさ（荷重）と、押圧点におけるドアインパクトビームに対する押し込み量（ストローク）との関係を示している。図５に示すグラフは比較例３及び比較例４の性能特性を示しており、比較例３のグラフはＣ３で示し、比較例４のグラフについてはＣ４で示す。図６に示すグラフは実施例１及び比較例１の性能特性を示しており、図中、実施例１のグラフはＥ１で示し、比較例１のグラフについてはＣ１で示す。図７に示すグラフは実施例２及び比較例２の性能特性を示しており、図中、実施例２のグラフはＥ２で示し、比較例２のグラフについてはＣ２で示す。 FIGS. 5 to 7 show graphs showing the results of performance evaluation performed for each of Examples 1 and 2 and Comparative Examples 1 to 4, respectively. These drawings show the relationship between the magnitude (load) of the reaction force of the door impact beam with respect to the vertical load and the pushing amount (stroke) with respect to the door impact beam at the pressing point. The graph shown in FIG. 5 shows the performance characteristics of Comparative Example 3 and Comparative Example 4, the graph of Comparative Example 3 is indicated by C3, and the graph of Comparative Example 4 is indicated by C4. The graph shown in FIG. 6 shows the performance characteristics of Example 1 and Comparative Example 1. In the figure, the graph of Example 1 is indicated by E1, and the graph of Comparative Example 1 is indicated by C1. The graph shown in FIG. 7 shows the performance characteristics of Example 2 and Comparative Example 2. In the figure, the graph of Example 2 is indicated by E2, and the graph of Comparative Example 2 is indicated by C2.
　図５のグラフに示されているように、引張強度ＴＳが１５００ＭＰａの高張力鋼板が用いられた場合、マッチング２５が長辺部及び短辺部のいずれに形成されていても、ほぼ同じ測定結果が得られた。すなわち、押し込み当初からストローク量の増大に伴って略直線的に荷重が増加し、その後、荷重増加の程度は緩やかとなって８０ｍｍのあたりのストローク量で荷重は最大値（１５．３～１５．４ＫＮ程度）に達する。さらにストローク量が増大すると、荷重は緩やかに低下する。この関係から、引張強度ＴＳが１５００ＭＰａの高張力鋼板を用いたドアインパクトビームでは、マッチング２５が設けられる位置にかかわらず、衝突エネルギーの吸収性能が急激に低下する現象は見られない。 As shown in the graph of FIG. 5, when a high-tensile steel plate having a tensile strength TS of 1500 MPa is used, the same measurement result is obtained regardless of whether the matching 25 is formed on the long side portion or the short side portion. was gotten. That is, the load increases substantially linearly with the increase in stroke amount from the beginning of pushing, and then the degree of increase in load becomes moderate, and the load is the maximum value (15.3 to 15. 4KN). When the stroke amount further increases, the load gradually decreases. From this relationship, in a door impact beam using a high-tensile steel plate having a tensile strength TS of 1500 MPa, a phenomenon in which the impact energy absorption performance is rapidly deteriorated is not seen regardless of the position where the matching 25 is provided.
　これに対し、図６のグラフに示されているように、引張強度ＴＳが１８００ＭＰａの高張力鋼板が用いられた場合、マッチング２５が短辺部に設けられた実施例１と長辺部に設けられた比較例１とでは大きく異なる結果が得られた。すなわち、比較例１の場合、当初はストローク量の増大に伴って荷重が増加するものの、ストローク量が６０ｍｍに達するとドアインパクトビームの破断によって荷重が急激に低下し、零となる。一方、実施例１では、比較例３及び４と比較して、引張強度が高まったことにより荷重の最大値が１９．５ＫＮまで高まり、荷重とストロークとの関係は同じ傾向を示した。このような相違は、長辺部にマッチング２５が形成された比較例１では、マッチング２５が設けられた部分に局所的に応力が集中する一方、実施例１ではそのような応力集中が生じていないことが原因となっている。このように、引張強度ＴＳが１８００ＭＰａの高張力鋼板を用いた実施例１では、側面衝突時に本体部１１の変形量が増大しても、衝突エネルギー吸収性能を安定的に維持することができる。 On the other hand, as shown in the graph of FIG. 6, when a high-tensile steel plate having a tensile strength TS of 1800 MPa is used, matching 25 is provided on the short side and Example 1 provided on the short side. The results were significantly different from those of Comparative Example 1 obtained. That is, in the case of Comparative Example 1, although the load increases with an increase in the stroke amount at the beginning, when the stroke amount reaches 60 mm, the load rapidly decreases due to the breakage of the door impact beam and becomes zero. On the other hand, in Example 1, as compared with Comparative Examples 3 and 4, the maximum value of the load increased to 19.5 KN due to the increase in tensile strength, and the relationship between the load and the stroke showed the same tendency. Such a difference is that in Comparative Example 1 in which the matching 25 is formed on the long side portion, stress is concentrated locally on the portion where the matching 25 is provided, whereas in Example 1, such stress concentration occurs. The cause is not. Thus, in Example 1 using a high-tensile steel plate having a tensile strength TS of 1800 MPa, the collision energy absorption performance can be stably maintained even if the deformation amount of the main body 11 increases during a side collision.
　このような傾向は、引張強度ＴＳが２０００ＭＰａの高張力鋼板が用いられた場合でも、図７のグラフに示されているように、同様に得られた。すなわち、比較例２では、当初はストローク量の増大に伴って荷重が増加するものの、ストローク量が５６ｍｍに達するとドアインパクトビームの破断によって荷重が急激に低下して零となる。一方、実施例２では、実施例１と比較して、引張強度が高まったことにより荷重の最大値が２１．７ＫＮまで高まり、荷重とストロークとの関係は実施例１と同じ傾向を示した。したがって、引張強度ＴＳが２０００ＭＰａの鋼板を用いた実施例２でも、衝突エネルギー吸収性能を安定的に維持することができる。 Such a tendency was obtained similarly as shown in the graph of FIG. 7 even when a high-tensile steel plate having a tensile strength TS of 2000 MPa was used. That is, in Comparative Example 2, although the load initially increases as the stroke amount increases, when the stroke amount reaches 56 mm, the load rapidly decreases due to the breakage of the door impact beam and becomes zero. On the other hand, in Example 2, compared with Example 1, the maximum value of the load increased to 21.7 KN due to the increase in tensile strength, and the relationship between the load and the stroke showed the same tendency as in Example 1. Therefore, even in Example 2 using a steel plate having a tensile strength TS of 2000 MPa, the collision energy absorption performance can be stably maintained.
　以上の通り、本実施形態のドアインパクトビーム１０は、本体部１１の上下縁部１１ａ，１１ｂではなく左右端縁部２３，２４の短辺部にマッチング２５が設けられている。そのため、側面衝突時に本体部１１の変形量が増大しても、衝突エネルギーの吸収性能が急激に低下することなく当該性能を安定的に維持することができる。この効果は、ドアインパクトビーム１０を形成する素材として、引張強度が１８００ＭＰａ～２０００ＭＰａの範囲の高張力鋼板を用いることにより顕著となる。 As described above, the door impact beam 10 of the present embodiment is provided with the matching 25 on the short sides of the left and right end edges 23 and 24 instead of the upper and lower edges 11a and 11b of the main body 11. Therefore, even if the deformation amount of the main body 11 increases at the time of a side collision, the performance of absorbing the collision energy can be stably maintained without sharply decreasing. This effect becomes prominent when a high-tensile steel plate having a tensile strength in the range of 1800 MPa to 2000 MPa is used as a material for forming the door impact beam 10.
　次に、ドアインパクトビーム１０及びその製造方法は、上記実施の形態で説明した構成に限定されるものではなく、例えば以下のように実施してもよい。 Next, the door impact beam 10 and the manufacturing method thereof are not limited to the configuration described in the above embodiment, and may be implemented as follows, for example.
　（ａ）ドアインパクトビーム１０において、図１Ａに示した形状は、あくまで一般的な形状を一例として示したものである。膨出部２２が一つのハット形状を有する形状、一対の膨出部２２が短手方向に一部拡げられた形状など、他の形状であってもよい。 (A) In the door impact beam 10, the shape shown in FIG. 1A is merely an example of a general shape. Other shapes such as a shape in which the bulging portion 22 has one hat shape and a shape in which the pair of bulging portions 22 are partially expanded in the lateral direction may be used.
　（ｂ）ドアインパクトビーム１０において、左右の端縁部２３，２４に設けられたマッチング２５は、一つであっても、３つ以上の複数であってもよい。マッチング２５は、複数段階の切断加工を行う際に、各段階での切断箇所をどう設定するかによって変更され得る。 (B) In the door impact beam 10, the matching 25 provided on the left and right edge portions 23, 24 may be one or may be three or more. The matching 25 can be changed depending on how to set the cutting location at each stage when performing a plurality of stages of cutting.
　（ｃ）ドアインパクトビーム１０において、マッチング２５の形状は上記実施形態のように四角形状ではなく、三角形状その他の角形状であってもよいし、円弧状など角形状以外の形状であってもよい。 (C) In the door impact beam 10, the shape of the matching 25 is not a quadrangular shape as in the above embodiment, but may be a triangular shape or other angular shape, or a shape other than a square shape such as an arc shape. Good.
　（ｄ）ドアインパクトビーム１０において、その外縁部全域において、複数段階の切断加工を経るために形成されるマッチング２５等の凹部がそもそも設けられていないものを採用してもよい。この構成によっても、左右の端縁部２３，２４にマッチング２５等の凹部が設けられたドアインパクトビーム１０と同じく、局所的な応力が集中する凹部が長辺部に設けられないことから、衝突エネルギー吸収性能を安定的に維持することができる。 (D) The door impact beam 10 may be one in which a concave portion such as a matching 25 formed to undergo a plurality of stages of cutting is not provided in the entire outer edge portion. Even in this configuration, as in the case of the door impact beam 10 in which concave portions such as matching 25 are provided in the left and right edge portions 23 and 24, a concave portion where local stress is concentrated is not provided in the long side portion. Energy absorption performance can be stably maintained.
　（ｅ）ドアインパクトビーム１０の製造方法として、前段加工及び後段加工のうち少なくともいずれか一方について、プレス切断加工ではなくレーザ切断加工を採用してもよい。レーザ切断加工を用いた場合でも、前段加工における第１切断ラインＬ１と後段加工における第２切断ラインＬ２とが交わるつなぎ部２６には、図１Ｂに示す拡大部分において二点鎖線で示すように、レーザ加工痕２９が形成される。レーザ加工痕２９は、マッチング２５と同様に凹状をなしている。なお、このようなレーザ加工痕２９は、図１Ｂに示す拡大部分だけでなく、マッチング２５が設けられた全ての部分において、マッチング２５に代わって形成される。 (E) As a method of manufacturing the door impact beam 10, laser cutting processing may be adopted instead of press cutting processing for at least one of the front stage processing and the rear stage processing. Even in the case of using laser cutting processing, the connecting portion 26 where the first cutting line L1 in the former stage processing and the second cutting line L2 in the latter stage processing intersect, as shown by the two-dot chain line in the enlarged portion shown in FIG. A laser processing mark 29 is formed. The laser processing mark 29 has a concave shape like the matching 25. Note that such a laser processing mark 29 is formed in place of the matching 25 not only in the enlarged portion shown in FIG. 1B but also in all portions where the matching 25 is provided.
　例えば、前段加工としてレーザ切断加工が行われる場合には、切断当初のピアッシングにより外縁部にはピアス痕の窪みがレーザ加工痕２９として形成されることがある。また、後段加工としてレーザ切断加工が行われる場合には、ピアッシングが不要であっても、切断開始点や切断終了点には、レーザ照射によって切断ラインよりも内側へ窪んだレーザ切断開始痕やレーザ切断終了痕としてレーザ加工痕２９が形成される。そこで、左右の端縁部２３，２４につなぎ部２６を設けることにより、凹状をなすレーザ加工痕２９が左右の端縁部２３，２４に設けられたドアインパクトビーム１０を得ることができる。 For example, when laser cutting is performed as the pre-stage processing, a pierce mark recess may be formed as a laser processing mark 29 on the outer edge due to piercing at the beginning of cutting. Also, when laser cutting is performed as a subsequent process, even if piercing is not required, the laser cutting start mark or laser that is recessed inward from the cutting line by laser irradiation at the cutting start point or cutting end point. A laser processing mark 29 is formed as a cutting end mark. Therefore, by providing the connecting portions 26 at the left and right edge portions 23 and 24, the door impact beam 10 in which the concave laser processing marks 29 are provided at the left and right edge portions 23 and 24 can be obtained.
　（ｆ）ドアインパクトビーム１０の製造方法として、上記実施形態で説明したトリミング工程は必須ではなく、トリミング工程を経ない方法を採用してもよい。 (F) As a manufacturing method of the door impact beam 10, the trimming process described in the above embodiment is not essential, and a method without the trimming process may be adopted.
　上記実施形態のようにトリミング工程を有する場合も、それとは異なってトリミング工程を有しない場合でも、鋼板からブランク材を得る工程において、上記のようにプレス切断加工による前段加工と後段加工とを適用してもよい。この場合も、前段加工及び後段加工の少なくともいずれか一方において、プレス切断加工ではなくレーザ切断加工を採用してもよい。 Even in the case of having a trimming step as in the above embodiment, and in the case of not having a trimming step, in the step of obtaining a blank material from a steel sheet, the pre-processing and post-processing by press cutting as described above are applied. May be. In this case as well, laser cutting may be employed instead of press cutting in at least one of the pre-stage processing and the post-stage processing.
　（ｇ）ドアインパクトビーム１０の製造方法として、ブランク材を得る工程又はトリミング工程では、上記実施形態のように２段階で切断するのではなく、３段階以上の工程を経て切除部分３２を切除するようにしてもよい。もっとも、この場合であっても、上記実施形態のように、左右の端縁部２３，２４にマッチング２５が形成されるように切断ラインが設定される。 (G) As a manufacturing method of the door impact beam 10, in the step of obtaining a blank material or the trimming step, the cut portion 32 is cut out through three or more steps instead of cutting in two steps as in the above embodiment. You may do it. However, even in this case, the cutting line is set so that the matching 25 is formed on the left and right edge portions 23 and 24 as in the above embodiment.
　（ｈ）ドアインパクトビームの製造方法として、ブランク材を得る工程やトリミング工程でマッチング２５等の凹部が形成されない方法を採用してもよい。この方法を採用したトリミング工程の一例について、図８を参照しながら説明する。図８に示すように、この別形態の製造方法も、前段階のプレス切断加工工程（前段加工）と、後段階のプレス切断加工工程（後段加工）とを有する。この２つの工程により、図８Ａに示す被トリム部品３０のうち切除部分３２を２段階に分けて切除する。図８Ｂに示すように、前段加工による切除で第１切除部分３３を切除し、後段加工によって第２切除部分３４を切除する点は上記実施形態と同じである。ただ、上記実施形態とは、前段加工によって切除されて残った第２切除部分３４の形状が異なる。 (H) As a method for manufacturing the door impact beam, a method in which a concave portion such as the matching 25 is not formed in a blank material obtaining process or a trimming process may be employed. An example of a trimming process employing this method will be described with reference to FIG. As shown in FIG. 8, this manufacturing method of another embodiment also has a pre-stage press cutting process (pre-stage process) and a post-stage press cutting process (post-stage process). By these two steps, the cut portion 32 of the trimmed component 30 shown in FIG. 8A is cut in two stages. As shown in FIG. 8B, the first excision portion 33 is excised by excision by the pre-stage processing, and the second excision portion 34 is excised by the post-stage processing, as in the above embodiment. However, the shape of the second excision portion 34 remaining after the excavation is different from that of the above embodiment.
　図１Ａに示すように、ドアインパクトビーム１０は、ブラケット部１２における上下の縁部１２ａ，１２ｂと、左右の端縁部２３，２４とで形成された角部２７とを有している。これら各角部２７は、それぞれ所定の半径を有する円弧状をなしている。別形態の製造方法では、図８Ａに示すように、この各角部２７が形成される箇所に、第１切断ラインＬ１と第２切断ラインＬ２とが交わるつなぎ部２８が設定される。 As shown in FIG. 1A, the door impact beam 10 has upper and lower edges 12 a and 12 b in the bracket portion 12 and corners 27 formed by left and right end edges 23 and 24. Each of the corner portions 27 has an arc shape having a predetermined radius. In the manufacturing method of another form, as shown to FIG. 8A, the connection part 28 where the 1st cutting line L1 and the 2nd cutting line L2 cross is set in the location in which this each corner | angular part 27 is formed.
　前段加工では、本体部１１における上下の縁部１１ａ，１１ｂと、ブラケット部１２における上下の縁部１２ａ，１２ｂに沿うように第１切断ラインＬ１が設定される。つなぎ部２８における第１切断ラインＬ１は、図８Ｃに一部のつなぎ部２８ａ（図８Ａ及び図８Ｂの右上部分）について拡大して示すように、前段及び後段加工によって形成される角部２７の半径に沿いながら途中で直線状をなして延びるように設定される。この切除により、図８Ｂ及び図８Ｃに示すように、本体部１１の上下の縁部１１ａ，１１ｂからブラケット部１２の上下の縁部１２ａ，１２ｂまでと、角部２７を形成する一部が切除される。続く後段加工では、後段加工によって形成される左右の端縁部２３，２４に沿うとともに、角部２７の半径に沿いながら途中で直線状をなして延びる第２切断ラインＬ２が設定される。この切除により、左右の端縁部２３，２４と、角部２７を形成する残りの部分が切除される。このような２つの切断ラインＬ１，Ｌ２が設定されることにより、マッチング２５を設けることなくドアインパクトビーム１０を得ることができる。 In the first stage processing, the first cutting line L1 is set along the upper and lower edges 11a and 11b in the main body 11 and the upper and lower edges 12a and 12b in the bracket section 12. The first cutting line L1 in the joint portion 28 is an enlargement of the corner portion 27 formed by the front stage and the rear stage processing, as shown in FIG. 8C in an enlarged manner with respect to a part of the joint portion 28a (upper right portion in FIGS. 8A and 8B). It is set to extend along a radius along a straight line. As shown in FIGS. 8B and 8C, a part of the corner portion 27 is cut off from the upper and lower edges 11 a and 11 b of the main body 11 to the upper and lower edges 12 a and 12 b of the bracket 12. Is done. In the subsequent post-process, a second cutting line L2 is set that extends along the left and right edge portions 23 and 24 formed by the post-process and extends in a straight line along the radius of the corner 27. By this excision, the left and right edge portions 23 and 24 and the remaining portions forming the corner portions 27 are excised. By setting such two cutting lines L1 and L2, the door impact beam 10 can be obtained without providing the matching 25.
　本開示は、実施形態に準拠して記述されたが、本開示は上記実施形態や構造に限定されるものではないと理解される。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。 Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the above-described embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.
　なお、課題を解決するための手段として記載した第１～第３の態様の他に、本実施の形態から抽出され得る態様についてその効果を示しつつ説明する。 In addition to the first to third aspects described as means for solving the problem, aspects that can be extracted from the present embodiment will be described while showing their effects.
　手段１．長尺状をなす車体部品の製造方法であって、
　複数段階の打ち抜き加工又はレーザ切断加工を含む複数段階を経て鋼板を切断する第１工程と、
　前記第１工程により得られた鋼板をハット形状に成形する第２工程と、
を備え、
　前記第１工程では、当該工程によって形成される外縁部のうち車体部品の短辺部となる部位に、前段加工における第１切断ラインと後段加工における第２ラインとが交わるつなぎ部を設定するようにした車体部品の製造方法。 Means 1. A method of manufacturing a body part having a long shape,
A first step of cutting a steel sheet through a plurality of stages including a plurality of stages of punching or laser cutting;
A second step of forming the steel plate obtained in the first step into a hat shape;
With
In the first step, a connecting portion where the first cutting line in the pre-stage machining and the second line in the post-stage machining intersect is set in a portion that becomes the short side portion of the vehicle body part in the outer edge formed by the step. Manufacturing method for car body parts.
　手段１の製造方法によれば、複数段階の切断加工に伴って形成されるマッチングやレーザ照射に伴って形成されるレーザ加工痕が外縁部のうち短辺部に設けられた車体部品が得られる。マッチングやレーザ加工痕が短辺部に設けられていることにより、長辺部にマッチングやレーザ加工痕が設けられている構成と異なり、側面衝突時にマッチングやレーザ加工痕へ応力が集中することを回避し、衝突エネルギー吸収性能を安定的に維持することができる。 According to the manufacturing method of the means 1, there is obtained a vehicle body part in which matching formed with a plurality of stages of cutting and laser processing marks formed with laser irradiation are provided on the short side of the outer edge. . Because the matching and laser processing traces are provided on the short side, unlike the configuration where the matching and laser processing traces are provided on the long side, stress is concentrated on the matching and laser processing traces at the time of side collision. The collision energy absorption performance can be stably maintained.
　手段２．長尺状をなす車体部品の製造方法であって、
　複数段階の打ち抜き加工又はレーザ切断加工を含む複数段階を経て鋼板を切断する第１工程と、
　前記第１工程により得られた鋼板をハット形状に成形する第２工程と、
を備え、
　前記第１工程では、当該工程によって形成される外縁部のうち車体部品の長辺部と短辺部とが交わる角部となる部位に、前段加工における第１切断ラインと後段加工における第２切断ラインとが交わるつなぎ部を設定するようにした車体部品の製造方法。 Mean 2. A method of manufacturing a body part having a long shape,
A first step of cutting a steel sheet through a plurality of stages including a plurality of stages of punching or laser cutting;
A second step of forming the steel plate obtained in the first step into a hat shape;
With
In the first step, the first cutting line in the pre-stage machining and the second cut in the post-stage machining are formed at the corners where the long side portion and the short side portion of the body part intersect in the outer edge portion formed by the step. A method of manufacturing a vehicle body part in which a connecting portion where the line intersects is set.
　手段２の製造方法によれば、複数段階の切断加工に伴って形成されるマッチング、レーザ照射による切断によって形成されるレーザ加工痕が設けられていない車体部品が得られる。これにより、車体部品の長辺部にマッチングやレーザ加工痕が設けられている構成と異なり、側面衝突時にマッチングやレーザ加工痕へ応力が集中することを回避し、衝突エネルギー吸収性能を安定的に維持することができる。 According to the manufacturing method of the means 2, there can be obtained a vehicle body part which is not provided with matching formed in a plurality of stages of cutting and laser processing traces formed by cutting by laser irradiation. As a result, unlike the configuration in which matching and laser processing traces are provided on the long sides of the body parts, it avoids stress concentration on the matching and laser processing traces at the time of a side collision and stabilizes the collision energy absorption performance. Can be maintained.
　手段３．前記車体部品は、引張強度が１６００ＭＰａ～２１００ＭＰａの高張力鋼板により形成されており、前記工程では前記高張力鋼板が切断される手段１又は２に記載の車体部品の製造方法。 Means 3. The method for manufacturing a vehicle body part according to means 1 or 2, wherein the vehicle body part is formed of a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa, and the high-tensile steel plate is cut in the step.
　マッチングやレーザ加工痕が長辺部に設けられていることが原因で生じる衝突エネルギー吸収性能の急激な低下は、引張強度が１６００ＭＰａ～２１００ＭＰａの高張力鋼板を用いた場合に生じる。そのため、手段３の製造方法によれば、この範囲の高張力鋼板を用いて手段１又は手段２の製造方法により車体部品を製造する場合に、衝突エネルギー吸収性能を安定的に維持できるという効果は顕著となる。 The sudden decrease in the collision energy absorption performance caused by the matching and laser processing marks being provided on the long side portion occurs when a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa is used. Therefore, according to the manufacturing method of the means 3, when a vehicle body part is manufactured by the manufacturing method of the means 1 or 2 using the high-tensile steel plate in this range, the effect that the collision energy absorption performance can be stably maintained is Become prominent.
　１０…ドアインパクトビーム、１１…本体部、２３…右端縁部、２４…左端縁部、２５…マッチング、２９…レーザ加工痕。 10 ... Door impact beam, 11 ... Main body, 23 ... Right edge, 24 ... Left edge, 25 ... Matching, 29 ... Laser processing mark.

Claims (3)

  1. 　長尺状に形成された車体部品であって、
    　長手方向に延びるハット部と、
    　複数段階の打ち抜き加工による製造時において外縁部のうち短辺部に形成されたマッチングと、
    を有する車体部品。     It is a body part formed in a long shape,
    A hat portion extending in the longitudinal direction;
    Matching formed on the short side of the outer edge during manufacturing by multi-stage punching,
    Body parts with
  2. 　長尺状に形成された車体部品であって、
    　長手方向に延びるハット部と、
    　レーザ切断加工を含む複数段階の切断加工による製造時において外縁部のうち短辺部に形成されたレーザ加工痕と、
    を有する車体部品。     It is a body part formed in a long shape,
    A hat portion extending in the longitudinal direction;
    Laser processing marks formed on the short side of the outer edge during manufacturing by multiple stages of cutting including laser cutting, and
    Body parts with
  3. 　引張強度が１６００ＭＰａ～２１００ＭＰａの高張力鋼板により形成されている請求項１又は２に記載の車体部品。 3. The vehicle body part according to claim 1, wherein the vehicle body part is formed of a high-tensile steel plate having a tensile strength of 1600 MPa to 2100 MPa.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04260815A (en) * 1991-02-14 1992-09-16 Toyota Motor Corp Impact beam for door of automobile
KR101517867B1 (en) * 2014-12-19 2015-05-06 (주)아산 Car door impact beam manufacturing method
WO2016084684A1 (en) * 2014-11-28 2016-06-02 豊田鉄工株式会社 Hot-stamped trim component
JP2016540678A (en) * 2013-11-15 2016-12-28 オートテック エンジニアリング エー．アイ．イー． Beam with U-shaped cross section

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04260815A (en) * 1991-02-14 1992-09-16 Toyota Motor Corp Impact beam for door of automobile
JP2016540678A (en) * 2013-11-15 2016-12-28 オートテック エンジニアリング エー．アイ．イー． Beam with U-shaped cross section
WO2016084684A1 (en) * 2014-11-28 2016-06-02 豊田鉄工株式会社 Hot-stamped trim component
KR101517867B1 (en) * 2014-12-19 2015-05-06 (주)아산 Car door impact beam manufacturing method

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