JPH01233019A - Pressing method for metallic plate - Google Patents
Pressing method for metallic plateInfo
- Publication number
- JPH01233019A JPH01233019A JP63058930A JP5893088A JPH01233019A JP H01233019 A JPH01233019 A JP H01233019A JP 63058930 A JP63058930 A JP 63058930A JP 5893088 A JP5893088 A JP 5893088A JP H01233019 A JPH01233019 A JP H01233019A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- metal plate
- residual stress
- metallic plate
- laser beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003825 pressing Methods 0.000 title abstract 3
- 229910052751 metal Inorganic materials 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 27
- 238000011084 recovery Methods 0.000 claims description 26
- 230000001678 irradiating effect Effects 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 24
- 229910000831 Steel Inorganic materials 0.000 description 21
- 239000010959 steel Substances 0.000 description 21
- 238000000465 moulding Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000012999 compression bending Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
ば産業上の利用分野〕
本発明は、金属板を金型を用いて所定の形状・寸法にプ
レス成形する、金属板のプレス成形方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for press forming a metal plate into a predetermined shape and size using a mold.
〔従来の技術］
金属板を素材とし、これらをプレス成形して各種形状・
寸法の製品を得るに際して、成形後に金型から成形品を
取り出すと、成形品が金型の形状・寸法と異なる形状に
変形する、いわゆる弾性回復現象による変形が生じて、
成形品に形状不良が発生することは良く知られている。[Conventional technology] Metal plates are used as materials, and these are press-formed into various shapes and shapes.
When a product with the same dimensions is obtained, when the molded product is removed from the mold after molding, deformation occurs due to the so-called elastic recovery phenomenon, in which the molded product deforms into a shape different from the shape and dimensions of the mold.
It is well known that shape defects occur in molded products.
これら形状不良は、通常、成形品が金型から取り出され
ると、金型から受けている拘束力が取り除かれ、残留応
力による弾性回復が生じるためである。そして、この弾
性回復により成形品に、■曲げの稜線を挟む二つの面の
なす角度が金型の角度と異なる、いわゆるスプリングバ
ックと呼ばれる角度変化、■側壁部の平面が曲率をもっ
た面になる壁反り現象、■長手方向軸に直角に交わる二
つの断面が回転するねじれ現象、■成形品の曲げ軸の稜
線が金型の稜線と曲率が異なる稜線反り等の形状不良現
象が発生ずる。These shape defects are usually caused by the fact that when the molded product is taken out of the mold, the restraining force from the mold is removed and elastic recovery occurs due to residual stress. As a result of this elastic recovery, the molded product undergoes an angular change called springback, in which the angle between the two surfaces sandwiching the bending ridge line is different from the angle of the mold, and ■ the flat surface of the side wall changes to a curved surface. (1) twisting phenomenon in which two cross sections perpendicular to the longitudinal axis rotate; and (2) shape defect phenomena such as ridgeline warping in which the curvature of the ridgeline of the bending axis of the molded product differs from that of the mold ridgeline.
従来、これら弾性回復現象に起因する形状不良を防止す
るために、金属板の材料特性面からの対策として、極力
、低降伏点材や高弾性率材のものを選定し、弾性回復量
を抑制する方法がある。Conventionally, in order to prevent shape defects caused by these elastic recovery phenomena, as a countermeasure in terms of the material properties of metal plates, materials with low yield points and high elastic modulus were selected as much as possible to suppress the amount of elastic recovery. There is a way to do it.
また、成形方法面からの対策としては、（ａ）曲げ加工
において、離型後の弾性回復による角度変化量をあらか
じめ見込んで過剰に曲げる：過剰曲げ法、（ｂ）曲げ部
にコイニング圧を加え、曲げ部分の板厚を減少させる、
またはパッド圧によりウェブのふくらみを抑える：ビー
ド底突き法、およびパッドによる底突き法、（Ｃ）成形
品のフランジにビードを付けることにより、剛性を増し
たり、圧縮変形を緩和させる：ビーディング法、（ｄ）
曲げ部にリブを付けることにより、曲げ部の剛性をたか
める：リブ何曲げ法、（ｅ）曲げ部に引張り力を加える
ことにより、板厚内の応力分布を均一化して弾性曲げモ
ーメントを低下させる；引張り曲げ法、（ｆ）曲げ加工
時に曲げ軸方向に圧縮力を加えることで、曲げ部の応力
状態を制御する：圧縮曲げ法、等々の方法がある。In addition, as countermeasures in terms of forming methods, (a) during bending, the amount of angle change due to elastic recovery after mold release is anticipated in advance: excessive bending method; (b) applying coining pressure to the bent part , reduce the plate thickness at the bending part,
Or suppress the bulge of the web by pad pressure: bead bottoming method and pad bottoming method; (C) adding a bead to the flange of a molded product to increase rigidity or alleviate compressive deformation: beading method ,(d)
Adding ribs to the bending part increases the rigidity of the bending part: Rib bending method (e) By applying tensile force to the bending part, the stress distribution within the plate thickness is made uniform and the elastic bending moment is reduced. ; tension bending method; (f) controlling the stress state of the bent part by applying compressive force in the direction of the bending axis during bending; compression bending method; and the like.
近年、部品の軽量化ないしは強度向」二を目的として、
プレス成形される金属板の強度が高くなる傾向にある。In recent years, with the aim of reducing the weight or increasing the strength of parts,
There is a tendency for the strength of press-formed metal plates to increase.
例えば、自動車用部品等は、車体の軽量化によって燃費
の向−１−を図るため、また車体強度を高めて乗員の安
全を図るために、プレス成形される金属板として３５〜
６０ｈｆ／ｍｍ２級の高強度鋼板が多く使用されるよう
になり、さらに最近では、８０〜１２０Ｋｇｆ／ｍｍ２
級の高強度鋼板の使用も検討されるようになってきてい
る。For example, automobile parts, etc., are made of press-formed metal plates of 35 to
60hf/mm2 grade high-strength steel plates are increasingly being used, and more recently, 80-120Kgf/mm2
The use of high-strength steel sheets is also being considered.
このように、使用される金属板の強度が高くなると、成
形品の弾性回復量が大きくなり、前述の弾性回復現象に
起因する形状・寸法不良の程度が増大される。このため
、金属板の強度が高くなるに従い、所定の形状・寸法お
よび精度を有する成形品を得ることがより困難となる。As described above, when the strength of the metal plate used increases, the amount of elastic recovery of the molded product increases, and the degree of shape and dimensional defects caused by the above-mentioned elastic recovery phenomenon increases. Therefore, as the strength of the metal plate increases, it becomes more difficult to obtain a molded product having a predetermined shape, size, and precision.
そして、プレス成形に際しての成形品の弾性回復量を抑
制するには、前述の従来技術のように、使用される金属
板として、できるだけ低降伏点材や同等の降伏点では高
弾性率材のものを選定することが望ましいが、上記の自
動車部品等のように、高強度部材を得るためには、使用
される金属板の材料特性がおのずと限定される。また、
高強度になるに従いアルミ合金板、鋼板などその金属の
種類も限定されるため、降伏点や弾性率面での選定自由
度は極度に狭められ、これをもって成形品の弾性回復量
を抑制する対策とし得なくなる。In order to suppress the amount of elastic recovery of the molded product during press forming, as in the prior art described above, the metal plate used should be made of a material with as low a yield point as possible or a material with a high elastic modulus at the same yield point. However, in order to obtain a high-strength member such as the above-mentioned automobile parts, the material properties of the metal plate used are naturally limited. Also,
As the strength increases, the types of metals such as aluminum alloy plates and steel plates are also limited, so the degree of freedom in selection in terms of yield point and elastic modulus is extremely limited, and this is a measure to suppress the amount of elastic recovery of molded products. It becomes impossible to do so.
一方、従来の技術の成形方法は、（ａ）過剰曲げ法おい
ては、あらかじめ弾性回復量を予測する必要があるため
、金型の設計に熟練を要する問題点がある。また、加工
品の曲げ部に剛性を与える（ｂ）ビード底突き法、およ
びパッドによる底突き法、（Ｃ）ビーディング法、（ｄ
）リブ何曲げ法や、加工品の曲げ部に引張り力や圧縮力
を加えて板厚方向の応力差をなくす（ｅ）引張り曲げ法
、（ｆ）圧縮曲げ法等においては、これらはプレス方向
とは別の異なった方向から力を加える必要があるため、
金型の構造が複雑なものとなる。加えて、プレス成形下
死点における応力状態を変化させるために、被加工材を
塑性変形させ得るだけの力を付加する必要があり、比較
的に大きな能力のプレスを要す等の金型構成および設備
上の問題が派生する。On the other hand, in the conventional molding method (a) in the excessive bending method, it is necessary to predict the amount of elastic recovery in advance, so there is a problem in that it requires skill in designing the mold. In addition, (b) bead bottoming method and pad bottoming method, (C) beading method, (d
) In the rib bending method, applying tensile force or compressive force to the bent part of the processed product to eliminate stress differences in the plate thickness direction, (e) tension bending method, (f) compression bending method, etc., these are applied in the press direction. Because it is necessary to apply force from a different direction,
The structure of the mold becomes complicated. In addition, in order to change the stress state at the bottom dead center of press forming, it is necessary to apply enough force to plastically deform the workpiece, and the mold configuration requires a press with relatively large capacity. and equipment problems.
さらにまた、同一の金型において、用いる金属板の降伏
強度が製造ロフト間で変化すると、得られる成形品の精
度が一定とならず、特に、多量生産の工場においては安
定した品質の加工品を得ることが困難となる。しかも、
この傾向は高降伏強度材料の場合にはより顕著となる。Furthermore, if the yield strength of the metal plate used in the same mold changes between manufacturing lofts, the precision of the molded product obtained will not be constant, especially in a mass production factory. difficult to obtain. Moreover,
This tendency becomes more pronounced in the case of high yield strength materials.
本発明は上記の従来の技術がもつ問題点を解消し、高強
度金属材料からなる金属板についても、所定の形状・寸
法に、精度良く、かつ安定して成形することを可能とす
る金属板のプレス成形方法の提供を目的とするものであ
る。The present invention solves the problems of the above-mentioned conventional techniques, and provides a metal plate that can be formed into a predetermined shape and size with high precision and stability, even for metal plates made of high-strength metal materials. The purpose of this invention is to provide a press molding method.
〔課題を解決するだめの手段〕
上記目的を達成するために本発明は以下の構成としてい
る。すなわち、本発明に係る金属板のプレス成形方法は
、金属板を金型を用いて所定形状の成形品とするプレス
成形方法において、成形された金属板の離型後に弾性回
復して当該成形品を変形させる残留応力の発生箇所を予
め把握し、該残留応力の発注箇所に対応する金型面部に
向かう照射孔を金型に予め穿設し、該金型を用いる被成
形金属板のプレス成形に際して、被成形金属板をプレス
成形下死点まで加圧した時に、該被成形金属板の残留応
力の発生箇所に、前記金型に設けた照射孔を通して高エ
ネルギービームを照射するものである。[Means for solving the problem] In order to achieve the above object, the present invention has the following configuration. That is, the press-forming method of a metal plate according to the present invention is a press-forming method in which a metal plate is formed into a molded product of a predetermined shape using a mold, and the molded metal plate recovers elastically after being released from the mold to form the molded product. The location where the residual stress that causes deformation is generated is determined in advance, and an irradiation hole is drilled in the mold in advance toward the mold surface corresponding to the location where the residual stress is ordered, and the metal plate to be formed is press-formed using the mold. At this time, when the metal plate to be formed is pressurized to the bottom dead center of press forming, a high-energy beam is irradiated through the irradiation hole provided in the mold to the location where residual stress occurs in the metal plate to be formed.
本発明の作用について以下に説明する。 The operation of the present invention will be explained below.
プレス成形に際して加圧成形される金属板は、プレス成
形下死点において金型形状に沿わされ、金型の曲げ角度
と同じ所定の形状・寸法のものとされているものの、そ
の内部に、特に大きな変形を受ける箇所に、その後の離
型時において、弾性回復して当該成形品を変形させる残
留応力が発生ずる。The metal plate that is pressure-formed during press forming is made to follow the shape of the mold at the bottom dead center of the press molding, and has a predetermined shape and size that is the same as the bending angle of the mold. Residual stress is generated at a location that undergoes large deformation, which elastically recovers and deforms the molded product during subsequent mold release.
本発明においては、このような残留応力の発生箇所を予
め把握しておき、かつ、該残留応力の発生箇所に対応す
る金型面部に向かう照射孔を金型に予め穿設し、該金型
を用いる被成形金属板のプレス成形に際して、被成形金
属板をプレス成形下死点まで加圧した時に、該被成形金
属板の残留応力の発生箇所に、前記金型に設けた照射孔
を通して高エネルギービームを照射するので、被成形金
属板は、該残留応力の発生箇所に照射される高エネルギ
ービームのエネルギーを受けて加熱され、該箇所の加工
組織の歪みを解放させられ歪みの無い安定した組織とな
る。これに伴い該箇所の残留応力を消滅させられる。In the present invention, the location where such residual stress occurs is known in advance, and an irradiation hole is previously drilled in the mold toward the mold surface corresponding to the location where the residual stress occurs. During press forming of a metal plate to be formed using a metal plate, when the metal plate to be formed is pressurized to the bottom dead center of the press forming, a high-temperature beam is applied to the location where residual stress occurs in the metal plate to be formed through an irradiation hole provided in the mold. Since the energy beam is irradiated, the metal plate to be formed is heated by receiving the energy of the high-energy beam irradiated to the location where the residual stress occurs, and the strain in the processed structure at the location is released, resulting in a stable and distortion-free state. Become an organization. Accordingly, the residual stress at the location can be eliminated.
そして、高エネルギービームの照射は、プレス成形下死
点まで加圧した時に行われるので、弾性回復を生じる残
留応力を消滅させられた被加工金属材料は、金型に充分
になじんだ後に離型させられることになり、その形状・
寸法は金型の形状・寸法に対応する精度のものとなる。Since the high-energy beam irradiation is carried out when the pressure is applied to the bottom dead center of the press molding, the metal material to be processed, which has eliminated the residual stress that causes elastic recovery, can be released from the mold after fully adapting to the mold. The shape and shape of the
The dimensions must be accurate enough to correspond to the shape and dimensions of the mold.
なお、本発明において、成形された金属板の離型後に弾
性回復して当該成形品を変形させる残留応力の発生箇所
を予め把握するについては、金型設計段階におけるシュ
ミレーションによる解析や、経験則にもとすき把握する
方法、ないしは照射孔を穿設する前の金型にて数次の予
備成形を行い、該予備成形結果を解析して把握する方法
等が適用される。In addition, in the present invention, in order to grasp in advance the location where residual stress occurs that causes elastic recovery of the molded metal plate after release from the mold and deforms the molded product, it is possible to use simulation analysis at the mold design stage or based on empirical rules. A method of determining the initial gap, or a method of performing several preforms in a mold before drilling the irradiation holes, and analyzing and understanding the results of the preforms, etc., are applied.
また、本発明において、金属板とは、冷間および熱間圧
延板、めっきを施した表面処理鋼板のみならず、チタン
、アルミ、銅等の金属の板状のものであり、高エネルギ
ービームとは、レーザビーム、電子ビーム、プラズマビ
ーム等の被照射体に熱を付与するエネルギービームをい
う。In addition, in the present invention, metal plates include not only cold- and hot-rolled plates and plated surface-treated steel plates, but also plate-shaped plates of metals such as titanium, aluminum, and copper. refers to an energy beam that imparts heat to an irradiated object, such as a laser beam, electron beam, or plasma beam.
そして、これら高エネルギービームの照射は、点、線あ
るいは格子状に走査し、かつ、それらの点の大きさや線
の幅、エネルギー密度、処理深さ等を任意に変え得るも
のである。Irradiation with these high-energy beams can be performed by scanning points, lines, or grids, and the size of the points, the width of the lines, the energy density, the processing depth, etc. can be arbitrarily changed.
［実施例］
以下に、本発明の実施例を図面を参照して以下に説明す
る。[Examples] Examples of the present invention will be described below with reference to the drawings.
第上災旌班
第１図ａおよび第１図すは本実施例の９０度■曲げ成形
方法の概念を説明する正断面図である。1A and 1S are front sectional views illustrating the concept of the 90-degree bending method of this embodiment.
第１図ａおよび第１図すにおいて、（１）は鋼板、（２
）はポンチ、（３）はダイス、（４）はビーム照射孔、
（５）はレーザービームをそれぞれ示す。In Figure 1a and Figure 1S, (1) is a steel plate, (2
) is a punch, (3) is a die, (4) is a beam irradiation hole,
(5) each shows a laser beam.
まず、供試材として、厚さ１ 、２ｍｍで、引張強度を
３０に級、６０に級、１００に級（ｋはＫｇｆ／開２の
略）とする冷延鋼板を、それぞれ準備した。First, cold-rolled steel plates with thicknesses of 1 mm and 2 mm and tensile strengths of 30, 60, and 100 (k stands for Kgf/2) were prepared as test materials.
これら鋼板の材料特性を第１表に示す。Table 1 shows the material properties of these steel plates.
上表に示す各鋼板（１）を、第１図ａに示すように９０
度■型面を設けたダイス（３）上にセットし、次いで、
第１図すに示すようにポンチ（２）を成形下死点まで加
圧降下させ、この時点において、被成形鋼板（１）に対
して最も変形応力が集中して残留応力が発生ずる箇所に
対応するＶ字状型面の底部に設けたダイス（３）のビー
ム照射孔（４）内を通して、図外の放射手段からのレー
ザービーム（５）を照射し、しかる後に成形後の鋼板（
１）を離型させた。Each steel plate (1) shown in the above table was heated to 90 mm as shown in Figure 1 a.
Place it on a die (3) with a shaped surface, and then
As shown in Figure 1, the punch (2) is pressurized and lowered to the bottom dead center of forming, and at this point, the point where deformation stress is most concentrated and residual stress is generated on the steel plate (1) to be formed is pressed. A laser beam (5) from a radiation means (not shown) is irradiated through the beam irradiation hole (4) of the die (3) provided at the bottom of the corresponding V-shaped mold surface, and then the formed steel plate (
1) was released from the mold.
なお、レーザービーム（５）の照射は、各成形毎にその
照射エネルギー密度を種々変え、また、比較例として、
従来と同様にレーザービーム（５）を照射しない成形も
行った。In addition, the irradiation energy density of the laser beam (5) was varied for each molding, and as a comparative example,
Molding was also performed without irradiation with the laser beam (5) as in the conventional method.
第２図は上記成形で得られた■曲げ成形品００）を示す
斜視図であって、図中の斜線で示す部位は前記のレーザ
ービーム（５）を照射した箇所である。FIG. 2 is a perspective view showing the bending molded product 00) obtained by the above molding, and the shaded area in the figure is the area irradiated with the laser beam (5).
得られた■曲げ成形品００）それぞれについて、図中の
Δθで表す所定の曲げ角度９０度に対する弾性回復量Δ
θ（スプリングバック量）を調べた。For each of the obtained bend-formed products 00), the elastic recovery amount Δ for a predetermined bending angle of 90 degrees, represented by Δθ in the figure.
θ (springback amount) was investigated.
これら調査結果の代表例を、比較例との対比において第
２表に示す。Representative examples of these survey results are shown in Table 2 in comparison with comparative examples.
第２表に示すように、本発明および比較例ともに、供試
材の強度が高くなる程、弾性回復量Δθも大きくなって
いるが、プレス成形下死点で被成形鋼板（１）の残留応
力が発生ずる箇所にレーザービーム（５）を照射した本
実施例のものは、その弾性回復量Δθが抑制され、また
、その効果は強度が高まる程、顕著となることが確認さ
れた。As shown in Table 2, in both the present invention and the comparative example, the higher the strength of the sample material, the greater the elastic recovery amount Δθ, but the amount of elastic recovery Δθ becomes larger at the bottom dead center of press forming. It was confirmed that in this example, where the laser beam (5) was irradiated to the location where stress was generated, the amount of elastic recovery Δθ was suppressed, and this effect became more pronounced as the intensity increased.
第３図は、本実施例の各成形品の調査結果に基ずく、照
射したレーザービームのエネルギー密度と弾性回復量Δ
θとの関係を示すグラフであって、該グラフ中の○印の
プロットは３０に級の鋼板を、Δ印のプロットは６０に
級の鋼板を、☆印のプロットは１００に級の鋼板を成形
した結果を示し、また、・印、ム印、★印のプロットは
、それぞれ比較例の結果を示す。Figure 3 shows the energy density of the irradiated laser beam and the amount of elastic recovery Δ, based on the investigation results of each molded product in this example.
This is a graph showing the relationship with θ, in which the plot marked with ○ indicates the steel plate of grade 30, the plot marked Δ indicates the steel plate of grade 60, and the plot marked with ☆ indicates the steel plate of grade 100. The results of molding are shown, and the plots marked with *, mu, and * show the results of comparative examples, respectively.
第３図で示すように、照射したレーザービームのエネル
ギー密度により弾性回復量Δθは多少変わるが、前記第
２図の斜視図中の斜線で示す箇所にごくわずかのレーザ
ービームを照射しただけで、弾性回復量Δθを減少させ
ることができる。As shown in Fig. 3, the amount of elastic recovery Δθ varies somewhat depending on the energy density of the irradiated laser beam, but if only a small amount of the laser beam is irradiated to the shaded area in the perspective view of Fig. 2, The amount of elastic recovery Δθ can be reduced.
第４図は、１００Ｋ級の鋼板を成形して得た成形品の曲
げ部の弾性回復量Δθとレーザービーム照射後の残留応
力の関係を示すグラフである。FIG. 4 is a graph showing the relationship between the amount of elastic recovery Δθ of the bent portion of a molded product obtained by molding a 100K class steel plate and the residual stress after laser beam irradiation.
第４図のグラフに示すように、レーザービームを照射し
たことにより、これら成形品の曲げ部の残留応力は減少
し、弾性弾性回復量Δθ（スプリングバック量）も減少
している。As shown in the graph of FIG. 4, by irradiating the laser beam, the residual stress in the bent portions of these molded products decreased, and the elastic recovery amount Δθ (springback amount) also decreased.
第１夫差韮−
本実施例はプレス成形に際してねじれ現象の起こり易い
長方形容器に適用した例である。First Difference Difference This example is an example in which the present invention is applied to a rectangular container that tends to be twisted during press molding.
第５図は成形された長方形容器を示す斜視図であって、
第５図に示す長方形容器（ＩＩ）は、第１実施例と同様
に、プレス成形下死点において図中の斜線で示す箇所に
レーザービームを照射したものである。また、比較例と
して、従来と同様にレーザービームを照射しない成形も
行った。FIG. 5 is a perspective view showing a molded rectangular container,
The rectangular container (II) shown in FIG. 5 is obtained by irradiating a laser beam onto the shaded area in the figure at the bottom dead center of the press molding, as in the first embodiment. In addition, as a comparative example, molding without laser beam irradiation was also performed as in the conventional method.
これら成形で得られた長方形容器（１１）それぞれにつ
いて、第５図中のθで表す所定平面度に対するねじれ角
θを８周べた。For each of the rectangular containers (11) obtained by these moldings, the twist angle θ with respect to the predetermined flatness represented by θ in FIG. 5 was plotted eight times.
第６図は、上記の調査結果に基ずく、照射したレーザー
ビームのエネルギー密度とねじれ角θとの関係を示すグ
ラフであって、該グラフ中のプロットは、前述の第１実
施例と同じく、○印は３０に級の鋼板、Δ印は６０に級
の鋼板、☆印は１００に級の鋼板を成形した結果をそれ
ぞれ示し、また、・印、ム印、★印は、それぞれ比較例
の結果を示す。FIG. 6 is a graph showing the relationship between the energy density of the irradiated laser beam and the twist angle θ based on the above investigation results, and the plots in the graph are similar to those in the first embodiment described above. The ○ mark indicates the result of forming a 30-grade steel plate, the Δ mark indicates the result of forming a 60-grade steel plate, the ☆ mark indicates the result of forming a 100-grade steel plate, and ･, mu, and ★ indicate the results of comparative examples, respectively. Show the results.
第６図に示すように、照射したレーザービームのエネル
ギー密度により多少変わるが、前記第５図中の斜線で示
す箇所にごくわずかのレーザービームを照射しただけで
、ねじれ角θを減少させることができる。As shown in Fig. 6, it is possible to reduce the torsion angle θ by irradiating only a small amount of the laser beam to the shaded area in Fig. 5, although it varies somewhat depending on the energy density of the irradiated laser beam. can.
第１ｔｎＬ例−
本実施例はプレス成形に際して壁反り現象の起こり易い
形状、すなわち絞り曲げ成形を要す形状の製品に適用し
た例である。1st tnL Example - This example is an example in which the present invention is applied to a product having a shape that is likely to cause wall warping during press molding, that is, a shape that requires drawing and bending.
第７図は成形品を示す斜視図であって、第７図に示す成
形品０２）は、第１実施例と同様に、プレス成形下死点
において図中の斜線で示す箇所にレーザービームを照射
したものである。また、比較例として、従来と同様にレ
ーザービームを照射しない成形も行った。FIG. 7 is a perspective view showing a molded product. Similar to the first embodiment, the molded product 02) shown in FIG. It was irradiated. In addition, as a comparative example, molding without laser beam irradiation was also performed as in the conventional method.
これら成形で得られた成形品０２）それぞれについて、
第７図中のδで表す所定壁面に対する壁反り量δを調べ
た。For each molded product 02) obtained by these moldings,
The amount of wall warpage δ with respect to a predetermined wall surface represented by δ in FIG. 7 was investigated.
第８図は、上記の調査結果に法ずく、照射したレーザ−
ビームのエネルギー密度と壁反り量δとの関係を示すグ
ラフであって、該グラフ中のプロットは、前述の第１実
施例と同じく、○印は３０に級の鋼板、Δ印は６０に級
の鋼板、☆印は１００に級の鋼板を成形した結果をそれ
ぞれ示し、また、・印、ム印、★印は、比較例の結果を
示す。Figure 8 shows the laser beam irradiated based on the above investigation results.
This is a graph showing the relationship between the energy density of the beam and the amount of wall warpage δ, and the plots in this graph are similar to the first embodiment described above, where the ○ mark indicates a 30 grade steel plate, and the Δ mark indicates a 60 grade steel plate. The steel plate and ☆ mark indicate the results of forming a steel plate of grade 100, and the marks ., .mu. and ★ indicate the results of comparative examples.
第８図に示すように、照射したレーザービームのエネル
ギー密度により多少変わるが、前記第７図中の斜線で示
す箇所にごくわずかのレーザービームを照射しただけで
、壁反り量δを減少させることができる。As shown in Fig. 8, although it varies somewhat depending on the energy density of the irradiated laser beam, the amount of wall warpage δ can be reduced by irradiating only a small amount of the laser beam to the shaded area in Fig. 7. Can be done.
〔発明の効果］
以上のように本発明によれば、金属板のプレス成形にお
いて加工品の離型後に生じる弾性回復に起因するスプリ
ングバック、ねじれ、反り、などを著しく低減させるこ
とが可能であり、所定の形状・寸法の加工品を精度の良
く、かつ安定して得ることができ、しかも、素材である
金属板の種類や強度など材料特性面に制約されることな
〈実施可能であるという本発明特有の効果を奏する。[Effects of the Invention] As described above, according to the present invention, it is possible to significantly reduce springback, twisting, warping, etc. caused by elastic recovery that occurs after releasing a processed product during press forming of a metal plate. , it is possible to obtain a processed product of a predetermined shape and size with high precision and stability, and it is not limited by the material properties such as the type and strength of the metal plate used as the material. This produces effects unique to the present invention.
第１図ａおよび第１図すは本発明の第１実施例のＶ曲げ
成形方法の概念を説明する正断面図、第２図は本発明の
第１実施例のＶ曲げ成形品を示す斜視図
第３図は本発明の第１実施例のレーザービームのエネル
ギー密度と弾性回復量Δθとの関係を示すグラフ、
第４図は本発明の第１実施例の曲げ部の弾性回復量へ〇
とレーザービーム照射後の残留応力の関係を示すグラフ
、
第５図は本発明の第２実施例の長方形容器を示す斜視図
第６図は本発明の第２実施例のレーザービームのエネル
ギー密度とねじれ角θとの関係を示すグラフ、
第７図は本発明の第３実施例の成形品を示す斜視図、
第８図は本発明の第３実施例のレーザービームのエネル
ギー密度と壁反り量δとの関係を示すグラフである。
（１）−鋼板、
（２）−ポンチ、
（３）−ダイス、
（４）−ビーム照射孔、
（５）−レーザービーム。
特許出願人 株式会社 神戸製鋼所
代 理 人 弁理士 金丸 章−
第３図
０ ７ ２．３４ ！；６
エネルギー密度（Ｊ／ｃｍ２）
曲げ部の残留応力（ｈｆ’／ｍｍ”）
ｃｏ（′ψ へ ０
（””）９門Ｑ酉血
〜 Ｃ）００ ℃ １ 〜 Ｏ（
誼）θｍ耳９叫
１、事件の表示
昭和６３年特許願第０５８９３０Ｍ
２、発明の名称
金属板のプレス成形方法
３、補正をする者
事件との関係 特許出願人
住 所 神戸市中央区脇浜町１丁目３番１８号名称
株式会社神戸製鋼所
代表者 亀高素吉
４、代理人 郵便番号 ６５７住 所
神戸市灘区岩屋北町５丁目１番３号日清青写真ビル４Ｆ
６、補正の対象
図面
７、補正の内容
「第１図」を別紙の通り補止する。
８、添イ」書類の目録
補正後の図面 １ 通
以 −トFigures 1a and 1 are front sectional views illustrating the concept of the V-bending method of the first embodiment of the present invention, and Figure 2 is a perspective view showing the V-bending product of the first embodiment of the present invention. Figure 3 is a graph showing the relationship between the energy density of the laser beam and the amount of elastic recovery Δθ in the first embodiment of the present invention. Figure 4 is a graph showing the relationship between the energy density of the laser beam and the amount of elastic recovery Δθ in the first embodiment of the invention 5 is a perspective view showing a rectangular container according to the second embodiment of the present invention. FIG. 6 is a graph showing the relationship between the energy density of the laser beam and the residual stress after laser beam irradiation. A graph showing the relationship with the twist angle θ, Fig. 7 is a perspective view showing a molded product according to the third embodiment of the present invention, and Fig. 8 is a graph showing the energy density of the laser beam and the amount of wall warpage according to the third embodiment of the present invention. It is a graph showing the relationship with δ. (1) - steel plate, (2) - punch, (3) - die, (4) - beam irradiation hole, (5) - laser beam. Patent Applicant Kobe Steel Co., Ltd. Agent Patent Attorney Akira Kanemaru - Figure 3 0 7 2.34! ;6 Energy density (J/cm2) Residual stress in bending part (hf'/mm") co('ψ to 0 ("")9 gate Q rooster blood ~ C) 00 ℃ 1 ~ O (
(1) Indication of the case 1986 Patent Application No. 058930M 2, Name of the invention Press forming method for metal plates 3, Person making the amendment Relationship to the case Patent applicant address Wakihama-cho, Chuo-ku, Kobe City 1-3-18 Name
Kobe Steel, Ltd. Representative: Sokichi Kametaka 4, Agent: Postal code: 657 Address:
Nissin Blueprint Building 4F 6, 5-1-3 Iwaya Kitamachi, Nada-ku, Kobe City, drawing 7 subject to amendment, contents of amendment "Figure 1" are supplemented as shown in the attached sheet. 8. Attachment 1 or more drawings after amendment of catalog of documents
Claims (1)
形方法において、成形された金属板の離型後に弾性回復
して当該成形品を変形させる残留応力の発生箇所を予め
把握し、該残留応力の発生箇所に対応する金型面部に向
かう照射孔を金型に予め穿設し、該金型を用いる被成形
金属板のプレス成形に際して、被成形金属板をプレス成
形下死点まで加圧した時に、該被成形金属板の残留応力
の発生箇所に、前記金型に設けた照射孔を通して高エネ
ルギービームを照射することを特徴とする金属板のプレ
ス成形方法。In a press forming method in which a metal plate is molded into a predetermined shape using a mold, the locations where residual stress occurs that causes elastic recovery and deformation of the molded product after the molded metal plate is released from the mold are grasped in advance, and the An irradiation hole directed toward the mold surface corresponding to the location where residual stress occurs is pre-drilled in the mold, and when press forming the metal plate to be formed using the mold, the metal plate to be formed is heated to the bottom dead center of the press forming. A method for press-forming a metal plate, characterized in that a high-energy beam is irradiated through an irradiation hole provided in the mold to a location where residual stress occurs in the metal plate to be formed when the metal plate is pressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63058930A JPH01233019A (en) | 1988-03-11 | 1988-03-11 | Pressing method for metallic plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63058930A JPH01233019A (en) | 1988-03-11 | 1988-03-11 | Pressing method for metallic plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01233019A true JPH01233019A (en) | 1989-09-18 |
Family
ID=13098552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63058930A Pending JPH01233019A (en) | 1988-03-11 | 1988-03-11 | Pressing method for metallic plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01233019A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6503639B1 (en) | 1999-07-22 | 2003-01-07 | Kobe Steel, Ltd. | Press-formed product and press-forming method |
| JP2005526617A (en) * | 2001-08-08 | 2005-09-08 | ユニヴァーシティ オブ ザ ウエスト オブ イングランド ブリストル | Molding method of workpiece |
| JP2007229724A (en) * | 2006-02-27 | 2007-09-13 | Jfe Steel Kk | Method of analyzing press forming |
| JP2009255106A (en) * | 2008-04-14 | 2009-11-05 | Nippon Steel Corp | Press forming method |
| US20100086803A1 (en) * | 2008-09-15 | 2010-04-08 | Thyssenkrupp Steel Ag | Hot-formed profile |
| US7886564B2 (en) | 2004-09-10 | 2011-02-15 | Nippon Steel Corporation | System, method, software arrangement and computer-accessible medium for press-forming of materials |
| WO2012118223A1 (en) * | 2011-03-03 | 2012-09-07 | 新日本製鐵株式会社 | Method for bending sheet metal and product of sheet metal |
| US9003847B2 (en) | 2009-06-29 | 2015-04-14 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Device and method for bending a workpiece |
| US9003848B2 (en) | 2009-06-29 | 2015-04-14 | Trumpf Maschinen Austria Gmbh & Co., Kg. | Device and method for bending a workpiece |
| US9527122B2 (en) | 2009-06-29 | 2016-12-27 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Device and method for the laser-supported bending of workpieces |
-
1988
- 1988-03-11 JP JP63058930A patent/JPH01233019A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004103601A1 (en) * | 1999-07-22 | 2004-12-02 | Jiro Iwaya | Press-formed body and press-forming method |
| US6503639B1 (en) | 1999-07-22 | 2003-01-07 | Kobe Steel, Ltd. | Press-formed product and press-forming method |
| JP2005526617A (en) * | 2001-08-08 | 2005-09-08 | ユニヴァーシティ オブ ザ ウエスト オブ イングランド ブリストル | Molding method of workpiece |
| US7886564B2 (en) | 2004-09-10 | 2011-02-15 | Nippon Steel Corporation | System, method, software arrangement and computer-accessible medium for press-forming of materials |
| US8091395B2 (en) | 2004-09-10 | 2012-01-10 | Nippon Steel Corporation | System, method, software arrangement and computer-accessible medium for press-forming of materials |
| JP2007229724A (en) * | 2006-02-27 | 2007-09-13 | Jfe Steel Kk | Method of analyzing press forming |
| JP2009255106A (en) * | 2008-04-14 | 2009-11-05 | Nippon Steel Corp | Press forming method |
| US20100086803A1 (en) * | 2008-09-15 | 2010-04-08 | Thyssenkrupp Steel Ag | Hot-formed profile |
| US9003847B2 (en) | 2009-06-29 | 2015-04-14 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Device and method for bending a workpiece |
| US9527122B2 (en) | 2009-06-29 | 2016-12-27 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Device and method for the laser-supported bending of workpieces |
| US9003848B2 (en) | 2009-06-29 | 2015-04-14 | Trumpf Maschinen Austria Gmbh & Co., Kg. | Device and method for bending a workpiece |
| WO2012118223A1 (en) * | 2011-03-03 | 2012-09-07 | 新日本製鐵株式会社 | Method for bending sheet metal and product of sheet metal |
| JP5682701B2 (en) * | 2011-03-03 | 2015-03-11 | 新日鐵住金株式会社 | Sheet metal bending method and product |
| EP2682199A4 (en) * | 2011-03-03 | 2014-11-19 | Nippon Steel & Sumitomo Metal Corp | Method for bending sheet metal and product of sheet metal |
| EP2682199A1 (en) * | 2011-03-03 | 2014-01-08 | Nippon Steel & Sumitomo Metal Corporation | Method for bending sheet metal and product of sheet metal |
| CN103402665A (en) * | 2011-03-03 | 2013-11-20 | 新日铁住金株式会社 | Method for bending sheet metal and product of sheet metal |
| US9539630B2 (en) | 2011-03-03 | 2017-01-10 | Nippon Steel & Sumitomo Metal Corporation | Method for bending sheet metal and product of sheet metal |
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