JP7207276B2 - press mold - Google Patents

press mold Download PDF

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JP7207276B2
JP7207276B2 JP2019209314A JP2019209314A JP7207276B2 JP 7207276 B2 JP7207276 B2 JP 7207276B2 JP 2019209314 A JP2019209314 A JP 2019209314A JP 2019209314 A JP2019209314 A JP 2019209314A JP 7207276 B2 JP7207276 B2 JP 7207276B2
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forming
punch
press
die
molding
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JP2021079407A (en
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靖廣 岸上
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JFE Steel Corp
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JFE Steel Corp
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Priority to JP2019209314A priority Critical patent/JP7207276B2/en
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to KR1020227016497A priority patent/KR20220082896A/en
Priority to MX2022005542A priority patent/MX2022005542A/en
Priority to CN202080078576.3A priority patent/CN114728323B/en
Priority to EP20888886.7A priority patent/EP4063037A4/en
Priority to PCT/JP2020/032025 priority patent/WO2021100276A1/en
Priority to US17/765,669 priority patent/US20220274151A1/en
Publication of JP2021079407A publication Critical patent/JP2021079407A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/01—Selection of materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/08—Dies with different parts for several steps in a process

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Description

本発明は、プレス成形金型に関し、特に、ブランクをポンチ底部と該ポンチ底部に深さの浅い凹形状部又は高さの低い凸形状部を有するプレス成形品にプレス成形するプレス成形金型に関する。
本願において、ブランクとは、熱延鋼板、冷延鋼板、あるいは鋼板に表面処理（電気亜鉛めっき，溶融亜鉛めっき，有機皮膜処理等）を施した表面処理鋼板をはじめ、ステンレス、アルミニウム、マグネシウム等、各種金属類から構成される金属板のことをいう。
また、本願において、ポンチ底部とは、ポンチとダイとで成形されるプレス成形品においてポンチがダイ側に押し込まれて底になった部位のこと指す。
さらに、本願において、「直下」、「下方」及び「上方」等の方向を表す語句は、プレス成形方向におけるポンチとダイの相対的な上下方向を表すものであり、例えば、ダイがポンチの上側にある場合、ポンチに対して「直下」及び「下方」とは、プレス成形方向においてダイと反対側の方向を意味し、ポンチに対して「上方」とは、プレス成形方向においてダイ側の方向を意味する。 The present invention relates to a press-molding die, and more particularly to a press-molding die for press-molding a blank into a press-molded product having a punch bottom and a shallow concave portion or a low convex portion on the bottom of the punch. .
In the present application, blanks refer to hot-rolled steel sheets, cold-rolled steel sheets, surface-treated steel sheets obtained by subjecting steel sheets to surface treatment (electrogalvanizing, hot-dip galvanizing, organic film treatment, etc.), stainless steel, aluminum, magnesium, etc. A metal plate made of various metals.
In addition, in the present application, the punch bottom portion refers to a portion of the press-molded product formed by the punch and the die where the punch is pushed into the die side and becomes the bottom.
Furthermore, in the present application, terms such as "directly below", "below", and "upper" indicate the relative vertical direction of the punch and the die in the press forming direction. , "directly below" and "below" with respect to the punch means the direction opposite to the die in the press-forming direction, and "above" with respect to the punch means the direction toward the die in the press-forming direction. means

自動車の軽量化による燃費向上、衝突安全性向上のニーズの高まりから、自動車車体における高張力鋼板の適用が拡大している。しかしながら、高張力鋼板を用いて自動車車体の部品をプレス成形により製造する場合、高張力鋼板の延性の低さによる成形性の低下や、高い材料強度に起因する寸法精度の悪化が課題とされている。これに加えて、部品の成形に要する成形荷重の増加も大きな問題となっており、プレスラインの変更や部品の分割が必要となるなど、高張力鋼板を適用する上での阻害要因となっている。 The application of high-strength steel sheets to automobile bodies is expanding due to the growing needs for improved fuel efficiency and improved collision safety due to the weight reduction of automobiles. However, when automobile body parts are manufactured by press forming using high-tensile steel sheets, there are problems such as deterioration of formability due to low ductility of high-tensile steel sheets and deterioration of dimensional accuracy due to high material strength. there is In addition to this, the increase in the forming load required to form the parts has become a major problem, requiring changes in the press line and division of the parts, which is a hindrance to the application of high-strength steel sheets. there is

そこで、高張力鋼板を用いたプレス成形において成形荷重を低減するための技術がこれまでにいくつか提案されている。
例えば、特許文献１には、ダイとパンチで金属板を成形するに際し、パンチが金属板に接触して該パンチのストローク終端に達するまでの間に、パンチを停止させ、所定時間経過後に金属板の成形を再開する動作を行うことで、金属板の応力を緩和し、成形荷重を低減する方法が開示されている。
また特許文献２には、ダイとポンチによるブランク材のプレス加工において、該ポンチを分割可動させることでブランク材を所定領域毎に逐次成形することにより、プレス加工時の成形荷重を低減する方法が開示されている。 Therefore, several techniques have been proposed so far for reducing the forming load in press forming using high-strength steel sheets.
For example, in Patent Document 1, when forming a metal plate with a die and a punch, the punch is stopped until the punch reaches the end of the stroke after contacting the metal plate, and after a predetermined time has passed, the metal plate A method is disclosed for relieving the stress in the metal plate and reducing the forming load by performing the operation of restarting the forming.
Further, Patent Document 2 discloses a method of reducing the forming load during press working by sequentially forming each predetermined region of the blank material by moving the punch separately in the press working of a blank material using a die and a punch. disclosed.

特開２０１１－２４５５２５号公報JP 2011-245525 A 特開２０１０－２０７９０７号公報JP 2010-207907 A

しかしながら、特許文献１に開示されている方法においては、成形中にパンチを停止するためにサーボプレスが必要となり、設備の制約を受ける。
また、特許文献２に開示されている方法では、金型構造が複雑になり高価になる上、成形性の低い高張力鋼板では成形時に割れやしわといった不具合を生じる場合があった。 However, the method disclosed in Patent Document 1 requires a servo press to stop the punch during molding, and is subject to equipment limitations.
Further, in the method disclosed in Patent Document 2, the mold structure is complicated and expensive, and high-strength steel sheets with low formability may cause defects such as cracks and wrinkles during forming.

さらに、例えば、図２に示すように、ポンチ底部１３にプレス成形方向に凹形状である凹形状部１５を有するプレス成形品１１をプレス成形する場合にあっては、板厚に近い深さの凹形状であるため、板厚をプレスで薄くする成形に類似して、その成形下死点付近において成形荷重の増大が顕著に見られ、成形荷重を低減することが重要な課題であった。しかしながら、特許文献１及び特許文献２に記載させている方法は、このようなプレス成形品１１を成形対象とするものではなく、板厚に近い深さの凹形状や凸形状にプレス成形する際の成形荷重を十分に低減させることが困難であった。そのため、ポンチ底部１３に深さの浅い凹形状部１５（又はプレス成形方向に高さの低い凸状の凸形状部）を有するプレス成形品１１のプレス成形過程における成形荷重を低減する技術が望まれていた。 Furthermore, for example, as shown in FIG. 2, in the case of press-molding a press-formed product 11 having a concave portion 15 that is concave in the press-forming direction at the punch bottom portion 13, a depth close to the thickness of the plate is required. Because of the concave shape, the forming load increases remarkably near the bottom dead center of the forming process, similar to forming that reduces the plate thickness by pressing, and reducing the forming load has been an important issue. However, the methods described in Patent Literature 1 and Patent Literature 2 are not intended for molding such a press-formed product 11, and when press-molding into a concave shape or a convex shape with a depth close to the thickness of the plate, It was difficult to sufficiently reduce the forming load of. Therefore, a technique for reducing the forming load in the press forming process of the press formed product 11 having the shallow concave portion 15 (or the convex convex portion having a low height in the press forming direction) in the punch bottom portion 13 is desired. was rare.

本発明は上記のような課題を解決するためになされたものであり、複雑な機構や構造を要せずに、プレス成形方向に凹状の凹形状部又は凸状の凸形状部がポンチ底部に形成されたプレス成形品のプレス成形過程における成形荷重を低減することができるプレス成形金型を提供することを目的とする。 SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. An object of the present invention is to provide a press-molding die capable of reducing the molding load in the press-molding process of the formed press-molded product.

（１）本発明に係るプレス成形金型は、ポンチとダイとを備えてなり、ポンチ底部と該ポンチ底部に深さの浅い凹形状部又は高さの低い凸形状部とを有するプレス成形品をプレス成形するものであって、
前記ポンチは、前記ポンチ底部を成形するポンチ底成形面部と、該ポンチ底成形面部に設けられて前記凹形状部を形成する凹形状形成部又は前記凸形状部を形成する凸形状形成部と、前記ポンチ底成形面部の下方に該ポンチ底成形面部よりもヤング率の低い低ヤング率部材が設置された低ヤング率部材設置領域部と、を有し、
該低ヤング率部材設置領域部は、前記ポンチにおける前記凹形状形成部又は凸形状形成部の直下の範囲を含み、かつプレス成形方向の投影面積が前記凹形状形成部又は凸形状形成部の投影面積の110%以上であることを特徴とするものである。 (1) A press-molding die according to the present invention comprises a punch and a die, and is a press-molded product having a bottom portion of the punch and a concave portion with a shallow depth or a convex portion with a low height at the bottom portion of the punch. is press-molded,
The punch includes a punch bottom molding surface portion that molds the punch bottom portion, a concave shape forming portion that forms the concave shape portion or a convex shape forming portion that forms the convex shape portion provided on the punch bottom forming surface portion, a low Young's modulus member installation area portion in which a low Young's modulus member having a Young's modulus lower than that of the punch bottom forming surface is installed below the punch bottom forming surface;
The low Young's modulus member installation area portion includes a range immediately below the concave shape forming portion or the convex shape forming portion in the punch, and the projected area in the press forming direction is the projection of the concave shape forming portion or the convex shape forming portion. It is characterized by being 110% or more of the area.

本発明によれば、ポンチ底部と該ポンチ底部に深さの浅い凹形状部又は高さの低い凸形状部とを有するプレス成形品をプレス成形するに際し、ポンチのポンチ底成形面部の下方にヤング率の低い低ヤング率部材設置領域部が設けられ、プレス成形過程において前記ポンチ底成形面部が前記低ヤング率部材設置領域部側にたわむようにすることで、前記ポンチ底成形面部における凹形状形成部又は凸形状形成部とブランクとのなじみを容易にすることで、成形下死点付近における成形荷重の増加を抑制することができる。 According to the present invention, when press-molding a press-formed product having a punch bottom and a shallow concave portion or a low convex portion at the bottom of the punch, a young mold is placed below the punch bottom forming surface portion of the punch. A low Young's modulus member installation area having a low modulus is provided, and the punch bottom molding surface is bent toward the low Young's modulus member installation area during the press molding process, thereby forming a concave shape in the punch bottom molding surface. By facilitating conformability between the portion or the convex-shaped forming portion and the blank, it is possible to suppress an increase in the forming load near the forming bottom dead center.

本発明の実施の形態に係るプレス成形金型の構成を説明する図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the structure of the press molding die which concerns on embodiment of this invention. 本発明において成形対象とする、ポンチ底部にプレス成形方向に凹状に形成された凹形状部を有するプレス成形品の一例を示す図である。FIG. 2 is a diagram showing an example of a press-formed product having a concave portion formed concavely in the press-forming direction on the bottom of a punch, which is a forming target in the present invention. 従来のプレス成形金型の構造を示す図である。It is a figure which shows the structure of the conventional press molding die. 従来のプレス成形金型を用いた場合の成形下死点付近でのプレス成形金型の変形を示す模式図である。FIG. 5 is a schematic diagram showing deformation of a press-molding die near the bottom dead center of molding when a conventional press-molding die is used. 本発明の実施の形態に係るプレス成形金型を用いた場合の成形下死点付近でのプレス成形金型の変形とたわみを示す模式図である。FIG. 5 is a schematic diagram showing deformation and deflection of the press-molding die near the bottom dead center of molding when the press-molding die according to the embodiment of the present invention is used. 本発明の実施の形態に係るプレス成形金型の他の態様の構成を説明する図である。It is a figure explaining the structure of the other aspect of the press molding die which concerns on embodiment of this invention. 実施例において、従来例に係るプレス成形金型の成形下死点付近における変形量のプレス成形解析結果を示す図である。In the example, it is a diagram showing a press-forming analysis result of the deformation amount near the bottom dead center of the press-forming die according to the conventional example. 実施例において、発明例に係るプレス成形金型の成形下死点付近における変形量のプレス成形解析結果を示す図である。In the example, it is a diagram showing the press forming analysis result of the deformation amount near the bottom dead center of the press forming die according to the example of the invention. 実施例において、プレス成形解析により求めたプレス成形過程における成形ストロークと成形荷重の関係を示すグラフである（（ａ）成形開始～成形下死点、（ｂ）成形下死点付近の拡大図）。2 is a graph showing the relationship between the forming stroke and the forming load in the press forming process obtained by press forming analysis in Examples ((a) from the start of forming to the bottom dead point of forming, (b) an enlarged view near the bottom dead point of forming). . 実施例において、成形下死点における成形荷重の従来例と発明例の結果を示すグラフである。10 is a graph showing the results of the conventional example and the invention example of the forming load at the forming bottom dead center in the examples. 実施例において、低ヤング率部材設置領域部のプレス成形方向の投影面積A1と凹形状形成部の投影面積A2との比と、成形荷重との関係を示すグラフである。 4 is a graph showing the relationship between the ratio of the projected area A1 in the press forming direction of the low Young's modulus member installation region portion to the projected area A2 of the recessed shape forming portion and the forming load in Examples.

本発明の実施の形態に係るプレス成形金型１は、図１に一例として示すように、ポンチ３とダイ５とブランクホルダ７を備えてなり、図２に例示するように、ポンチ底部１３と、ポンチ底部１３に凹状に形成された凹形状部１５とを有して凹形状部１５の深さが浅いプレス成形品１１をプレス成形するものである。
ここで、凹形状部１５の深さが浅いとは、少なくともプレス成形品１１の成形高さよりも小さいことをいい、例えば、凹形状部１５のプレス成形方向における深さが10mm以下で板厚に近い深さのものであるとする。
以下、本実施の形態に係るプレス成形金型１の各構成について説明する。なお、以下の説明においては、同一の機能を有する要素については同一の符号を付して、説明を割愛した。 A press-molding die 1 according to an embodiment of the present invention comprises a punch 3, a die 5 and a blank holder 7 as shown in FIG. , and a recessed portion 15 formed in a recessed shape in the punch bottom portion 13, and a press-formed product 11 having a shallow depth of the recessed portion 15 is press-molded.
Here, the shallow depth of the recessed portion 15 means that it is at least smaller than the molding height of the press-formed product 11. For example, the depth of the recessed portion 15 in the press-forming direction is 10 mm or less, and the plate thickness does not exceed 10 mm. It is assumed that the depths are close to each other.
Hereinafter, each configuration of the press molding die 1 according to this embodiment will be described. In the following description, elements having the same functions are denoted by the same reference numerals, and descriptions thereof are omitted.

ポンチ３は、プレス成形品１１のポンチ底部１３を形成するポンチ底成形面部３ａと、ポンチ底部１３に凹形状部１５を形成する凹形状形成部３ｂと、ポンチ３の内部におけるポンチ底成形面部３ａの下方（プレス成形方向においてダイ５と反対側）に設けられ、ポンチ底成形面部３ａよりもヤング率の低い低ヤング率部材３ｃが設置された低ヤング率部材設置領域部３ｄと、を有してなる。 The punch 3 includes a punch bottom forming surface portion 3a forming the punch bottom portion 13 of the press-formed product 11, a concave shape forming portion 3b forming a concave portion 15 in the punch bottom portion 13, and a punch bottom forming surface portion 3a inside the punch 3. and a low Young's modulus member installation region 3d provided below (on the side opposite to the die 5 in the press forming direction) and installed with a low Young's modulus member 3c having a lower Young's modulus than the punch bottom forming surface 3a. It becomes

低ヤング率部材３ｃは、一般的にポンチ３やダイ５を構成する部材として使用される鋳物や鋼材よりもヤング率の低い材質のものであり、例えば、ゴム材やウレタン材などの樹脂類や、アルミニウムやマグネシウムなどの金属類が例示できる。 The low Young's modulus member 3c is made of a material having a Young's modulus lower than that of castings or steel generally used as members constituting the punch 3 and the die 5. Examples thereof include resins such as rubber and urethane. , metals such as aluminum and magnesium.

低ヤング率部材設置領域部３ｄは、凹形状形成部３ｂの直下の範囲を含み、かつプレス成形方向の投影面積A1が凹形状形成部３ｂの投影面積A2の110%以上である。 The low Young's modulus member installation region portion 3d includes a range immediately below the concave shape forming portion 3b, and the projected area A1 in the press forming direction is 110% or more of the projected area A2 of the concave shape forming portion 3b.

なお、図１に示すプレス成形金型１においては、低ヤング率部材設置領域部３ｄの全体に低ヤング率部材３ｃが設置されている。そして、低ヤング率部材設置領域部３ｄに低ヤング率部材３ｃを設置する方法としては、ポンチ３の内部を低ヤング率部材３ｃと同形状に加工してはめ込むものや、ボルトによる締結、接着材での固定などが挙げられる。 In addition, in the press molding die 1 shown in FIG. 1, the low Young's modulus member 3c is installed in the entire low Young's modulus member installation area portion 3d. As a method for installing the low Young's modulus member 3c in the low Young's modulus member installation area portion 3d, the inside of the punch 3 may be processed into the same shape as the low Young's modulus member 3c and then fitted, or fastening with a bolt or adhesive may be used. Fixation in the .

ダイ５は、ブランク９を挟んでポンチ３に対向して配置され、ポンチ３側に相対移動してポンチ３と協働してプレス成形品１１を成形するものであり、プレス成形品１１のポンチ底部１３を成形するポンチ底成形面部５ａと、ポンチ底部１３に凹形状部１５を形成する凹形状形成部５ｂと、を有する。 The die 5 is arranged to face the punch 3 with the blank 9 interposed therebetween. It has a punch bottom forming surface portion 5 a for forming the bottom portion 13 and a concave shape forming portion 5 b for forming the concave portion 15 in the punch bottom portion 13 .

ブランクホルダ７は、ブランク９を挟んでダイ５に対向してポンチ３側に配設され、ダイ５と協働してブランク９の端部を挟持してポンチ３側に相対移動するものである。 The blank holder 7 is arranged on the side of the punch 3 so as to face the die 5 with the blank 9 therebetween. .

次に、上記のように構成された本実施の形態に係るプレス成形金型１を用いてプレス成形品１１をプレス成形する場合におけるプレス成形金型１の動作とその作用効果について、図３に示す従来のプレス成形金型２１を用いた場合と対比して説明する。 Next, FIG. 3 shows the operation of the press-molding die 1 and its effects when press-molding the press-molded product 11 using the press-molding die 1 according to the present embodiment configured as described above. The description will be made in comparison with the case of using the conventional press molding die 21 shown in FIG.

図３に示すような、ポンチ２３とダイ５とブランクホルダ７とを備えた従来のプレス成形金型２１を用いてプレス成形品１１をプレス成形する場合、まず、ポンチ２３とダイ５との間にブランク９を配置し、ブランク９の両端部をダイ５とブランクホルダ７とで挟持する。続いて、ダイ５とブランクホルダ７とでブランク９を挟持した状態のまま、ダイ５とブランクホルダ７をポンチ２３側に相対移動させることにより、ポンチ底部１３が成形される。そして、成形下死点付近においてプレス成形品１１が決め押しされる際に、ダイ５の凹形状形成部５ｂがブランク９をポンチ２３の凹形状形成部２３ｂ側に押し込むことにより、ポンチ底部１３に凹形状部１５が形成される。 When press-molding a press-molded product 11 using a conventional press-molding die 21 having a punch 23, a die 5, and a blank holder 7 as shown in FIG. The blank 9 is placed on the rim, and both ends of the blank 9 are sandwiched between the die 5 and the blank holder 7 . Subsequently, the punch bottom 13 is formed by relatively moving the die 5 and the blank holder 7 toward the punch 23 while the blank 9 is held between the die 5 and the blank holder 7 . Then, when the press-formed product 11 is pressed in the vicinity of the bottom dead center of the molding, the recessed shape forming portion 5b of the die 5 pushes the blank 9 toward the recessed shape forming portion 23b of the punch 23. A concave portion 15 is formed.

このとき、成形下死点付近においては、図４に示すように、ポンチ２３及びダイ５それぞれは表面が弾性変形して図４中の矢印の方向に押し潰される。なお、図４中の破線は、ポンチ２３及びダイ５の変形前の表面形状を示し、斜線でハッチングされた領域は、成形下死点付近においてポンチ２３及びダイ５が押し潰された領域を示したものである。 At this time, in the vicinity of the bottom dead center of molding, as shown in FIG. 4, the surfaces of the punch 23 and the die 5 are elastically deformed and crushed in the directions of the arrows in FIG. The dashed lines in FIG. 4 indicate the surface shapes of the punch 23 and the die 5 before deformation, and the hatched area indicates the area where the punch 23 and the die 5 are crushed near the bottom dead center of molding. It is a thing.

しかしながら、ポンチ２３及びダイ５は弾性変形しづらいためにその変形量は小さく、ブランク９をポンチ２３の凹形状形成部２３ｂになじませて凹形状部１５を形成するためには、成形下死点付近においてダイ５に板厚をプレス成形して薄くするような大きな成形荷重を作用させてブランク９をポンチ２３側に押し込むことを要する。 However, since the punch 23 and the die 5 are difficult to elastically deform, the amount of deformation is small. It is necessary to press the blank 9 toward the punch 23 side by applying a large forming load to the die 5 in the vicinity of the die 5 so as to reduce the plate thickness by press forming.

これに対して、本実施の形態に係るポンチ３とダイ５とを備えたプレス成形金型１を用いてプレス成形品１１をプレス成形する場合において、図５に示すように、成形下死点付近においては、ポンチ３及びダイ５の表面が押し潰される。ここで、図５中の破線は、ポンチ３及びダイ５の変形前の表面形状を示す。 On the other hand, when press-molding a press-molded product 11 using the press-molding die 1 having the punch 3 and the die 5 according to the present embodiment, as shown in FIG. Nearby, the surfaces of the punch 3 and the die 5 are crushed. Here, broken lines in FIG. 5 indicate the surface shapes of the punch 3 and the die 5 before deformation.

このとき、ダイ５においては、従来のプレス成形金型２１と同様、成形下死点付近においてダイ５の表面が弾性変形により押し潰される（図５中のダイ５における斜線でハッチングされた領域）。
一方、ポンチ底成形面部３ａの下方は凹形状形成部３ｂの直下を含む範囲に低ヤング率部材設置領域部３ｄが設けられているため、成形下死点付近におけるポンチ底成形面部３ａが低ヤング率部材設置領域部３ｄ側にたわみ、ポンチ３の表面の変形を誘発する（図５中のポンチ３におけるハッチングされた領域）。 At this time, in the die 5, the surface of the die 5 is crushed by elastic deformation in the vicinity of the bottom dead center of the molding, similarly to the conventional press molding die 21 (the area hatched with oblique lines in the die 5 in FIG. 5). .
On the other hand, since the low Young's modulus member installation region 3d is provided below the punch bottom forming surface 3a in a range including directly below the concave shape forming portion 3b, the punch bottom forming surface 3a near the bottom dead center of the forming has a low Young's modulus. It bends toward the rate member installation area portion 3d, and induces deformation of the surface of the punch 3 (the hatched area of the punch 3 in FIG. 5).

そして、ポンチ底成形面部３ａのたわみによるポンチ３の変形量は、従来のプレス成形金型２１におけるポンチ２３の弾性変形による変形量に比べて大きいため、ポンチ３の凹形状形成部３ｂとブランク９とが容易になじむ。
その結果、本実施の形態に係るプレス成形金型１によれば、成形下死点付近における成形荷重の増加を抑制し、凹形状部１５が形成されたプレス成形品１１をプレス成形することができる。 Since the amount of deformation of the punch 3 due to the deflection of the punch bottom molding surface portion 3a is larger than the amount of deformation due to elastic deformation of the punch 23 in the conventional press molding die 21, the concave shape forming portion 3b of the punch 3 and the blank 9 easy to get used to.
As a result, according to the press-forming die 1 according to the present embodiment, it is possible to suppress an increase in the forming load near the bottom dead center of the forming process, and press-form the press-formed product 11 in which the recessed portion 15 is formed. can.

特に、本発明は、590MPa級以上の高張力鋼板をブランク９として用いてプレス成形する場合に、成形下死点付近における成形荷重の増加を効果的に抑制する。 In particular, the present invention effectively suppresses an increase in forming load near the bottom dead center of forming when a high-strength steel sheet of 590 MPa class or higher is used as the blank 9 and press-formed.

さらに、本発明に係るプレス成形金型は、ポンチの内部に低ヤング率部材が設置されたことにより、構造的に内部を空洞にすることが困難な場合であっても（例えば、プレス成形金型が小さくてポンチの内部を空洞にするとポンチの十分な強度が確保できない、等）、ポンチの内部に低ヤング率部材を設置することで強度を確保しつつ、成形過程においてポンチにたわみを生じさせて成形荷重を低減することができる。 Furthermore, the press molding die according to the present invention has a low Young's modulus member installed inside the punch, even if it is difficult to make the interior hollow structurally (for example, the press molding die If the die is small and the inside of the punch is hollow, sufficient strength cannot be secured for the punch, etc.). and the molding load can be reduced.

また、本発明は上記のとおり、ポンチの低ヤング率部材設置領域部のプレス成形方向の投影面積を、凹形状形成部の投影面積の110%以上とすることで、プレス成形過程においてポンチ底成形面部をたわませることを可能とするものであるが、ポンチ底成形面部のプレス成形方向における厚みに関しては、ポンチ底成形面部をたわませることを可能となるように適宜設定すればよい。なお、凹形状形成部の投影面積とは、ポンチ底成形面部３ａの凹形状形成部３ｂの底の部分から投影した面積である。 In addition, as described above, in the present invention, the projected area of the low Young's modulus member installation region of the punch in the press forming direction is 110% or more of the projected area of the concave shape forming portion, so that the punch bottom is formed in the press forming process. The thickness of the punch bottom forming surface in the press forming direction may be appropriately set so that the punch bottom forming surface can be bent. The projected area of the concave shape forming portion is the area projected from the bottom portion of the concave shape forming portion 3b of the punch bottom forming surface portion 3a.

上記の説明において、ポンチ３は、低ヤング率部材設置領域部３ｄの全体に低ヤング率部材３ｃが設置されたものであった。もっとも、本発明は、図６に示すように、ポンチ３３に設けられた低ヤング率部材設置領域部３３ｄの一部に低ヤング率部材３３ｃが設置されたプレス成形金型３１であってもよい。 In the above description, the punch 3 has the low Young's modulus member 3c installed over the entire low Young's modulus member installation region 3d. However, as shown in FIG. 6, the present invention may be a press molding die 31 in which a low Young's modulus member 33c is installed in a part of a low Young's modulus member installation area portion 33d provided in a punch 33. .

そして、低ヤング率部材３３ｃが、ポンチ３３のポンチ底成形面部３３ａよりもヤング率が低く、低ヤング率部材設置領域部３３ｄが、凹形状形成部３３ｂの直下の範囲を含み、かつプレス成形方向の投影面積A1が凹形状形成部３３ｂの投影面積A2の110%以上であれば、低ヤング率部材３３ｃが設置される位置や範囲については、特に限定はない。 The low Young's modulus member 33c has a Young's modulus lower than that of the punch bottom forming surface 33a of the punch 33, and the low Young's modulus member installation region 33d includes a range immediately below the concave shape forming portion 33b, and in the press forming direction. As long as the projected area A 1 of is 110% or more of the projected area A 2 of the concave shape forming portion 33b, there is no particular limitation on the position or range where the low Young's modulus member 33c is installed.

なお、上記の説明は、プレス成形方向に凹状となる凹形状部１５がポンチ底部１３に形成されたプレス成形品１１を成形する場合についてのものであったが、本発明に係るプレス成形金型は、プレス成形方向に凸状となる凸形状部がポンチ底部に形成され、凸形状部の高さが低いプレス成形品（図示なし）をプレス成形するものであってもよい。 The above description is for the case of molding the press-formed product 11 in which the concave portion 15 that is concave in the press-forming direction is formed in the punch bottom portion 13. However, the press-forming mold according to the present invention may press-form a press-formed product (not shown) in which a convex portion that is convex in the press-forming direction is formed on the bottom of the punch and the height of the convex portion is low.

ここで、凸形状部の高さが低いとは、少なくともプレス成形品の成形高さよりも低いことを意味するものであり、例えば、凸形状部の高さが10mm以下であって、板厚に近い高さのプレス成形品について、本発明を好適に適用することができる。 Here, the height of the convex portion is low means that it is at least lower than the molding height of the press-formed product. The present invention can be suitably applied to press-molded products having similar heights.

そして、凸形状部がポンチ底部に形成されたプレス成形品を本発明に係るプレス成形金型を用いてプレス成形する場合であっても、成形下死点付近において凸形状部を形成する際に、ダイがポンチ側に押し込まれることにより、ポンチのポンチ底成形面部が下方の低ヤング率部材設置領域部側にたわみ、ブランクがポンチの凸形状形成部になじみやすくなり、成形下死点付近におけるプレス成形荷重の増加を抑制して凸形状部を形成することができる。 Further, even in the case of press-molding a press-molded product in which the convex portion is formed at the bottom of the punch using the press molding die according to the present invention, when forming the convex portion near the bottom dead center of the molding, , By pushing the die toward the punch side, the punch bottom forming surface portion of the punch bends downward toward the low Young's modulus member installation region side, making it easier for the blank to conform to the convex shape forming portion of the punch, and near the bottom dead point of forming The convex portion can be formed while suppressing an increase in the press forming load.

また、本実施の形態に係るプレス成形金型１は、図１に示すように、ポンチ３の上方にダイ５が配置され、ダイ５をポンチ３側に下降させる方向をプレス成形方向とするものであったが、本発明は、ポンチ３をダイ５側に上昇させる方向をプレス成形方向とするものであってもよい。
さらに、本発明に係るプレス成形金型は、ポンチの下方にダイが配置され（図示なし）、ポンチをダイ側に下降させるものや、ダイをポンチ側に上昇させるもの等であってもよく、ポンチとダイの位置関係やプレス成形方向を特に限定するものではない。 In the press-forming die 1 according to the present embodiment, as shown in FIG. 1, the die 5 is arranged above the punch 3, and the direction in which the die 5 is lowered toward the punch 3 is the press-forming direction. However, in the present invention, the direction in which the punch 3 is lifted toward the die 5 may be the press forming direction.
Furthermore, the press molding die according to the present invention may have a die arranged below the punch (not shown), and the punch may be lowered to the die side or the die may be raised to the punch side. The positional relationship between the punch and the die and the press molding direction are not particularly limited.

また、上記の説明において、図１に示すプレス成形金型１は、ブランクホルダ７を備え、ダイ５とブランクホルダ７とによりブランク９の両端部を挟持してドロー成形によりプレス成形品１１をプレス成形するものであったが、本発明は、ブランクホルダを備えず、ポンチ３とダイ５を備えてなり、フォーム成形によりプレス成形品１１をプレス成形するプレス成形金型であってもよい。 In the above description, the press-molding die 1 shown in FIG. The present invention may be a press-molding die for press-molding the press-molded product 11 by form-molding, provided with the punch 3 and the die 5 without the blank holder.

本発明に係るプレス成形金型の作用効果を検証する実験を行ったので、以下、これについて説明する。 An experiment was conducted to verify the effects of the press molding die according to the present invention, and the experiment will be described below.

実験では、図１に示す本発明に係るプレス成形金型１を用いて、図２に示すプレス成形品１１をプレス成形する過程のプレス成形解析を行い、該プレス成形する過程におけるポンチ３の変形と成形荷重を評価した。 In the experiment, the press-molding die 1 according to the present invention shown in FIG. 1 was used to perform press-molding analysis of the process of press-molding the press-molded product 11 shown in FIG. and the forming load were evaluated.

プレス成形解析では、ブランク９として引張強度1180MPa級、板厚1.2mmの高張力鋼板を用いた。成形対象とするプレス成形品１１は、図２に示すように、ポンチ底部１３と、ポンチ底部１３にプレス成形方向に凹状の凹形状部１５とを有する断面ハット形状であり、各部位の寸法は図２に示すとおりである。
なお、ポンチ底部１３に形成する凹形状部１５の深さは3mmとし、プレス成形品１１の成形高さ（＝20mm）に比べて小さくて板厚に近いものとした。 In the press forming analysis, a high-strength steel sheet with a tensile strength of 1180 MPa and a thickness of 1.2 mm was used as the blank 9 . As shown in FIG. 2, the press-formed product 11 to be formed has a hat-shaped cross section having a punch bottom 13 and a recessed portion 15 that is recessed in the press-forming direction at the punch bottom 13. The dimensions of each part are It is as shown in FIG.
The depth of the concave portion 15 formed in the punch bottom portion 13 was set to 3 mm, which was smaller than the forming height (=20 mm) of the press-formed product 11 and close to the plate thickness.

実験では、図１に示すポンチ３とダイ５とブランクホルダ７とを備えてなるプレス成形金型１を用いてプレス成形品１１をプレス成形する過程のプレス成形解析を行ったものを発明例とした。
発明例において、プレス成形金型１のポンチ３は、ポンチ底成形面部３ａと、凹形状形成部３ｂと、ポンチ底成形面部の下方にポンチ底成形面部３ａよりもヤング率の低い低ヤング率部材３ｃが設置された低ヤング率部材設置領域部３ｄと、を有する。 In the experiment, the process of press-molding a press-molded product 11 using the press-molding die 1 comprising the punch 3, the die 5, and the blank holder 7 shown in FIG. bottom.
In the invention example, the punch 3 of the press molding die 1 includes a punch bottom forming surface portion 3a, a concave shape forming portion 3b, and a low Young's modulus member whose Young's modulus is lower than that of the punch bottom forming surface portion 3a below the punch bottom forming surface portion. and a low Young's modulus member installation region portion 3d where 3c is installed.

プレス成形解析において、ポンチ３の材質はFC250（ねずみ鋳鉄）とし、そのヤング率は115GPaとした。
一方、低ヤング率部材３ｃのヤング率は0.1GPaとし、ポンチ３のポンチ底成形面部３ａのヤング率よりも低い値とした。
さらに、低ヤング率部材設置領域部３ｄは、凹形状形成部３ｂの直下の範囲を含み、かつプレス成形方向の投影面積A1が凹形状形成部３ｂの投影面積A2の110%とした。 In the press forming analysis, the material of the punch 3 was FC250 (gray cast iron) and its Young's modulus was 115 GPa .
On the other hand, the Young's modulus of the low Young's modulus member 3c is 0.1 GPa, which is lower than the Young's modulus of the punch bottom forming surface 3a of the punch 3.
Further, the low Young's modulus member installation region portion 3d includes a range immediately below the concave shape forming portion 3b, and the projected area A1 in the press forming direction is 110% of the projected area A2 of the concave shape forming portion 3b.

さらに、比較対象として、図３に示すポンチ２３とダイ５とブランクホルダ７とを備えてなる従来のプレス成形金型２１を用いてプレス成形品１１をプレス成形する過程のプレス成形解析を行ったものを従来例とした。 Furthermore, for comparison, a press-molding analysis of the process of press-molding the press-molded product 11 using a conventional press-molding die 21 comprising a punch 23, a die 5, and a blank holder 7 shown in FIG. 3 was performed. was used as a conventional example.

図７及び図８に、成形下死点付近におけるポンチ及びダイのプレス成形方向の変形量の従来例及び発明例の結果を示す。
図７に示す従来例においては、ポンチ２３の凹形状形成部２３ｂ及びダイ５の凹形状形成部５ｂの端縁近傍にプレス成形方向の変形が見られ、変形量の最大値は約0.02mmであった。
一方、図８に示す発明例においては、ポンチ３の凹形状形成部３ｂの下方と、ダイ５の凹形状形成部５ｂの上方それぞれの広い範囲にプレス成形方向の変形が見られ、変形量の最大値は約0.05mmであり、従来例に比べて大きく増加した。 7 and 8 show the results of the conventional example and the invention example of the amount of deformation of the punch and die in the press forming direction near the bottom dead center of forming.
In the conventional example shown in FIG. 7, deformation in the press-forming direction is observed in the vicinity of the edges of the recessed shape forming portion 23b of the punch 23 and the recessed shape forming portion 5b of the die 5, and the maximum amount of deformation is about 0.02 mm. there were.
On the other hand, in the example of the invention shown in FIG. The maximum value is about 0.05 mm, which is a large increase compared to the conventional example.

図９に、プレス成形過程における成形ストロークと成形荷重の関係を示す。
図９より、従来例及び発明例における成形荷重はいずれも、成形開始（成形ストローク0mm）とともに徐々に増加し、成形下死点付近（成形ストローク約21～23mm）において急激に増加した。
そして、図９（ａ）、（ｂ）に示すように、成形開始から成形下死点付近（成形ストローク22.7mm）までの従来例と発明例の成形荷重はほぼ等しい結果であった。
しかしながら、図９（ｂ）に示すように、成形下死点付近においては、従来例に比べて発明例は成形荷重が低下していることが分かる。 FIG. 9 shows the relationship between the forming stroke and the forming load in the press forming process.
As shown in FIG. 9, the forming load in both the conventional example and the invention example gradually increased at the start of forming (forming stroke 0 mm), and increased sharply near the bottom dead center of forming (forming stroke about 21 to 23 mm).
As shown in FIGS. 9(a) and 9(b), the forming loads of the conventional example and the inventive example from the start of forming to the vicinity of the forming bottom dead center (forming stroke of 22.7 mm) were almost the same.
However, as shown in FIG. 9(b), it can be seen that the forming load of the inventive example is lower than that of the conventional example near the forming bottom dead center.

図１０に、成形下死点（成形ストローク23mm）における従来例と発明例の成形荷重を比較したグラフを示す。
図１０より、発明例においては、従来例に比べて成形荷重が約2.0tonf低下する結果となった。 FIG. 10 shows a graph comparing the forming loads of the conventional example and the inventive example at the bottom dead center of forming (forming stroke of 23 mm).
From FIG. 10, in the invention example, the forming load was reduced by about 2.0 tonf compared to the conventional example.

次に、ポンチ３における凹形状形成部３ｂの大きさを変えて、凹形状形成部３ｂの直下の範囲を含む低ヤング率部材設置領域部３ｄの投影面積A1と凹形状形成部３ｂの投影面積A2との比を変えて、成形下死点における成形荷重を比較し、結果を図１１に示した。 Next, by changing the size of the concave shape forming portion 3b in the punch 3 , the projection area A1 of the low Young's modulus member installation region portion 3d including the range immediately below the concave shape forming portion 3b and the projection of the concave shape forming portion 3b are calculated. The forming load at the forming bottom dead center was compared by changing the ratio to the area A 2 , and the results are shown in FIG. 11 .

図１１より、本発明の範囲である低ヤング率部材設置領域部３ｄの投影面積A1と凹形状形成部３ｂの投影面積A2との比が110%以上で、成形荷重が著しく低下することがわかる。
なお、低ヤング率部材設置領域部３ｄが凹形状形成部３ｂの直下から外れた場合は、図１１に示す投影面積A1とA2の比が100%未満の結果と同等になり、成形荷重を十分に低減することができなかった。 From FIG. 11, it can be seen that when the ratio of the projected area A1 of the low Young's modulus member installation region portion 3d and the projected area A2 of the recessed shape forming portion 3b, which is within the scope of the present invention, is 110% or more, the forming load is significantly reduced. I understand.
In addition, when the low Young's modulus member installation region portion 3d is out of directly below the concave shape forming portion 3b, the result is equivalent to the result that the ratio of the projected areas A 1 and A 2 shown in FIG. 11 is less than 100%, and the forming load could not be sufficiently reduced.

なお、本実施例は、プレス成形方向に凹状の凹形状部がポンチ底部に形成されたプレス成形品を成形対象とするものであったが、プレス成形方向に凸状の凸形状部がポンチ底部に形成されたプレス成形品を成形対象とする場合も同様に、成形下死点付近において成形荷重が低減する効果が得られることも確認した。 In this example, a press-formed product in which a concave portion having a concave shape in the press forming direction was formed in the bottom portion of the punch was to be molded. It was also confirmed that the effect of reducing the forming load in the vicinity of the forming bottom dead center can be similarly obtained when a press-formed product formed at 1.5 mm is formed as a forming target.

以上より、本発明に係るプレス成形金型によれば、ポンチ底部にプレス成形方向に凹状の凹形状部又は凸状の凸形状部が形成されたプレス成形品をプレス成形する場合において、ポンチのポンチ底成形面部を該ポンチ底成形面部の下方の低ヤング率部材設置領域部側にたわませることにより、成形下死点付近における成形荷重を低減できることが実証された。 As described above, according to the press-molding die of the present invention, when press-molding a press-molded product having a concave concave portion or a convex convex portion formed in the press-forming direction on the bottom of the punch, It was demonstrated that the forming load near the bottom dead center of forming can be reduced by bending the punch bottom forming surface toward the low Young's modulus member installation region below the punch bottom forming surface.

１ プレス成形金型
３ ポンチ
３ａ ポンチ底成形面部
３ｂ 凹形状形成部
３ｃ 低ヤング率部材
３ｄ 低ヤング率部材設置領域部
５ ダイ
５ａ ポンチ底成形面部
５ｂ 凹形状形成部
７ ブランクホルダ
９ ブランク
１１ プレス成形品
１３ ポンチ底部
１５ 凹形状部
２１ プレス成形金型（従来構造）
２３ ポンチ
２３ａ ポンチ底成形面部
２３ｂ 凹形状形成部
３１ プレス成形金型
３３ ポンチ
３３ａ ポンチ底成形面部
３３ｂ 凹形状形成部
３３ｃ 低ヤング率部材
３３ｄ 低ヤング率部材設置領域部 1 Press Mold 3 Punch 3a Punch Bottom Molding Surface 3b Concave Forming Part 3c Low Young's Modulus Member 3d Low Young's Modulus Member Installation Region 5 Die 5a Punch Bottom Molding Surface 5b Concave Forming Part 7 Blank Holder 9 Blank 11 Press Molding Item 13 Punch bottom 15 Concave portion 21 Press mold (conventional structure)
23 Punch 23a Punch bottom molding surface 23b Concave shape forming portion 31 Press molding die 33 Punch 33a Punch bottom molding surface 33b Concave shape forming portion 33c Low Young's modulus member 33d Low Young's modulus member installation region

Claims (1)

ポンチとダイとを備えてなり、ポンチ底部と該ポンチ底部に深さの浅い凹形状部又は高さの低い凸形状部とを有するプレス成形品をプレス成形するプレス成形金型であって、
前記ポンチは、前記ポンチ底部を成形するポンチ底成形面部と、該ポンチ底成形面部に設けられて前記凹形状部を形成する凹形状形成部又は前記凸形状部を形成する凸形状形成部と、前記凹形状形成部又は前記凸形状形成部及び前記ポンチ底成形面部の下方に該ポンチ底成形面部よりもヤング率の低い低ヤング率部材が設置された低ヤング率部材設置領域部と、を有し、
該低ヤング率部材設置領域部は、前記ポンチにおける前記凹形状形成部又は凸形状形成部の直下の範囲と前記ポンチ底成形面部の下方の範囲を含み、かつプレス成形方向の投影面積が前記凹形状形成部又は凸形状形成部の投影面積の110%以上であることを特徴とするプレス成形金型。 A press-molding mold comprising a punch and a die for press-molding a press-molded product having a bottom of the punch and a concave portion with a shallow depth or a convex portion with a low height at the bottom of the punch,
The punch includes a punch bottom molding surface portion that molds the punch bottom portion, a concave shape forming portion that forms the concave shape portion or a convex shape forming portion that forms the convex shape portion provided on the punch bottom forming surface portion, a low Young's modulus member installation area section in which a low Young's modulus member having a lower Young's modulus than the punch bottom forming surface section is installed below the concave forming section or the convex forming section and the punch bottom forming surface section. death,
The low Young's modulus member installation region portion includes a range immediately below the concave shape forming portion or the convex shape forming portion of the punch and a range below the punch bottom forming surface portion , and the projected area in the press forming direction is the concave. A press molding die characterized in that the projected area of the shape forming portion or the convex shape forming portion is 110% or more.
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EP20888886.7A EP4063037A4 (en) 2019-11-20 2020-08-25 Press-forming mold
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