JP4415668B2 - Surface shape distortion amount calculation method and apparatus in molding process simulation - Google Patents
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- 238000000034 method Methods 0.000 title claims description 61
- 238000004364 calculation method Methods 0.000 title claims description 42
- 238000000465 moulding Methods 0.000 title claims description 40
- 238000004088 simulation Methods 0.000 title claims description 36
- 238000009826 distribution Methods 0.000 claims description 46
- 238000012545 processing Methods 0.000 claims description 42
- 230000007547 defect Effects 0.000 claims description 29
- 238000003860 storage Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 description 27
- 206010040954 Skin wrinkling Diseases 0.000 description 4
- 230000008602 contraction Effects 0.000 description 4
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- 230000037303 wrinkles Effects 0.000 description 4
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- 238000003825 pressing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
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Description
本発明は、成形加工シミュレーションにより板材を塑性変形させたとき、その板材にどの程度の面形状歪みが生じるかを正確に演算するための成形加工シミュレーションにおける面形状歪み量演算方法及びその装置に関する。 The present invention relates to a method and apparatus for calculating a surface shape strain in a forming processing simulation for accurately calculating how much surface shape distortion occurs in the plate material when the plate material is plastically deformed by forming processing simulation.
従来、鍛造、圧延、プレス成形など、材料の塑性変形を伴う成形加工では、的確な素材形状、金型形状、加工条件の選定が要求される。この要求に短期間で効率的かつ安価に応えるために、有限要素法(ＦＥＭ)による数値シミュレーションが用いられる。数値シミュレーションの結果に基づいて、素材形状、金型形状、加工条件を設定すれば、実際の加工を行ったときに、所望の品質を備えた製品が得られる。 Conventionally, in a forming process that involves plastic deformation of a material such as forging, rolling, or press forming, selection of an accurate material shape, mold shape, and processing conditions is required. In order to meet this requirement efficiently and inexpensively in a short period of time, numerical simulation by the finite element method (FEM) is used. If the material shape, mold shape, and processing conditions are set based on the result of the numerical simulation, a product having a desired quality can be obtained when actual processing is performed.
例えば、下記特許文献１では、金属板の成形過程を有限要素法で解析してひずみ分布及び応力分布を求め、これらの分布から加工不良の発生の有無や加工不良の発生場所を視覚的に判定し、この判定結果から最適な加工条件が設定できるようにしている。
しかしながら、このような従来の手法では、加工不良として、破断が生じる危険性、しわが生じる危険性を視覚的に把握することはできるが、ひずみの小さな面形状不良(しわ、面ひずみ)は判断することはできないし、ましてやどの程度の面形状歪みが生じるのかを予測することもできない。 However, with such conventional methods, it is possible to visually grasp the risk of breakage and the risk of wrinkles as processing defects, but it is possible to judge surface shape defects with small distortion (wrinkles, surface distortion). It is impossible to predict, and even more, how much surface shape distortion will occur.
本発明は、このような従来の手法の問題点を解消するために成されたものであり、成形加工シミュレーションを用いて板材を塑性変形させたとき、その板材にどの程度の面形状歪みが生じるのかを正確に演算することができる成形加工シミュレーションにおける面形状歪み量演算方法及びその装置の提供を目的とする。 The present invention has been made to solve the problems of the conventional method, and when a plate material is plastically deformed using a molding process simulation, how much surface shape distortion occurs in the plate material. It is an object of the present invention to provide a surface shape distortion amount calculation method and apparatus in a molding process simulation that can accurately calculate whether or not.
上記目的を達成するための本発明に係る成形加工シミュレーションにおける面形状歪み量演算方法は、設定された成形加工条件で被成形品を擬似的に加工し任意の加工時点における前記被成形品の応力分布を演算する段階と、演算された応力分布に基づいて前記被成形品の幅縮み量を演算する段階と、演算された幅縮み量に基づいて前記被成形品各部の面形状歪み量を演算する段階と、を含むことを特徴とする。 In order to achieve the above object, a method for calculating a surface shape distortion amount in a molding process simulation according to the present invention is a method of artificially processing a molded article under set molding process conditions, and stressing the molded article at an arbitrary processing point. Calculating the distribution, calculating the width shrinkage of the molded product based on the calculated stress distribution, and calculating the surface shape distortion amount of each part of the molded product based on the calculated width shrinkage And a step of performing.
また、上記目的を達成するための本発明に係る成形加工シミュレーションにおける面形状歪み量演算装置は、成形加工条件を設定する設定手段と、設定された成形加工条件で被成形品を擬似的に加工する加工手段と、任意の加工時点における前記被成形品の応力分布を演算する応力分布演算手段と、演算された応力分布を記憶する応力分布記憶手段と、記憶されている応力分布に基づいて前記被成形品の幅縮み量を演算する幅縮み量演算手段と、演算された幅歪み量から前記被成形品各部の面形状歪み量を演算する面形状歪み量演算手段と、を有することを特徴とする。 In addition, the surface shape distortion amount calculation device in the forming process simulation according to the present invention for achieving the above object includes a setting means for setting forming process conditions, and a pseudo-processed product under the set forming process conditions. Processing means, stress distribution calculating means for calculating the stress distribution of the molded article at an arbitrary processing time, stress distribution storing means for storing the calculated stress distribution, and the above based on the stored stress distribution A width reduction amount calculating means for calculating a width shrinkage amount of the molded product, and a surface shape distortion amount calculating means for calculating a surface shape distortion amount of each part of the molded product from the calculated width distortion amount. And
本発明に係る成形加工シミュレーションにおける面形状歪み量演算方法およびその装置によれば、被成形品を擬似的に加工したときの任意の加工時点における応力分布から直接被成形品各部の面形状歪み量が演算できるようにしたので、成形加工シミュレーションを用いて板材を塑性変形させたとき、その板材に面形状不良が生じるか否かを正確に判定することができ、さらにその板材にどの程度の面形状歪みが生じるのかを正確に予測することができる。 According to the method and apparatus for calculating the surface shape distortion in the molding processing simulation according to the present invention, the surface shape distortion amount of each part of the molded product directly from the stress distribution at an arbitrary processing time when the molded product is simulated. Therefore, when a plate material is plastically deformed using a molding process simulation, it is possible to accurately determine whether or not a surface shape defect occurs in the plate material, and to what extent the plate material has Whether or not the shape distortion occurs can be accurately predicted.
以下に添付図面を参照して、本発明にかかる面形状歪み量演算方法及びその装置の好適な実施の形態を詳細に説明する。図１は、本発明にかかる面形状歪み量演算装置のブロック図、図２は、図１の面形状歪み量演算装置によって実行される面形状歪み量演算方法の手順を示すフローチャートである。 Exemplary embodiments of a surface shape distortion amount calculation method and apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of a surface shape distortion amount calculation apparatus according to the present invention, and FIG. 2 is a flowchart showing a procedure of a surface shape distortion amount calculation method executed by the surface shape distortion amount calculation apparatus of FIG.
本発明にかかる面形状歪み量演算装置は、成形加工条件を入力して設定する設定手段としての加工条件入力部１０、設定された成形加工条件に従って被成形品を擬似的に加工する、すなわち、成形加工シミュレーションを実行する加工手段としての成形加工シミュレーション実行部１５、成形加工シミュレーションを実行したときに得られた成形品各部の応力分布を記憶する応力分布記憶手段としての応力分布記憶部２０、任意の加工時点における被成形品の応力分布を演算し、その応力分布を応力分布記憶部２０に出力するとともに、応力分布に基づいて被成形品の幅縮み量を演算し、演算された幅歪み量から被成形品各部の面形状歪み量を演算する、幅縮み量演算手段および面形状歪み量演算手段としての面形状歪み量演算部２５、面形状歪み量の演算対象領域を指定する領域指定部３０、面形状歪み量演算部２５による面形状不良の有無の判定結果を表示する表示手段としての判定結果表示部３５を備えている。 The surface shape distortion amount calculation device according to the present invention is a processing condition input unit 10 as a setting means for inputting and setting molding processing conditions, and pseudo-processes a product to be molded according to the set molding processing conditions. A molding process simulation execution unit 15 as a processing unit for executing a molding process simulation, a stress distribution storage unit 20 as a stress distribution storage unit for storing the stress distribution of each part of the molded product obtained when the molding process simulation is executed, and any The stress distribution of the molded product at the time of machining is calculated, the stress distribution is output to the stress distribution storage unit 20, the width shrinkage amount of the molded product is calculated based on the stress distribution, and the calculated width distortion amount A surface shape distortion amount calculating unit 25 as a width reduction amount calculating means and a surface shape distortion amount calculating means, Area specifying unit 30 for specifying a calculation target region of the distortion amount, and a determination result display unit 35 as a display means for displaying a determination result of the presence or absence of surface shape defects caused by the surface shape distortion amount calculating unit 25.
なお、面形状歪み量演算部２５は、幅縮み量と面形状歪み量との対応関係を示すテーブルを有し、このテーブルを参照することによって、演算された幅縮み量から被成形品各部の面形状歪み量を演算している。 The surface shape distortion amount calculation unit 25 has a table showing a correspondence relationship between the width shrinkage amount and the surface shape distortion amount, and by referring to this table, the surface shape distortion amount calculation unit 25 calculates each part of the molded product from the calculated width shrinkage amount. The surface shape distortion amount is calculated.
面形状歪み量演算装置は、図２のフローチャートに示す手順で面形状歪み量の演算および面形状不良有無判定を行う。まず、操作者は加工条件入力部１０に成形加工条件を設定する。成形加工シミュレーション実行部１５は、シミュレーションプログラムを実行し設定された成形加工条件で被成形品を擬似的に加工する。面形状歪み量演算部２５は、成形加工シミュレーション実行部１５によって加工される被成形品の任意の加工時点における応力分布を演算する。例えば、成形加工がプレス加工であれば、プレスの加工終了時（金型の下死点）における被成形品各部の応力分布を演算する。演算された応力分布は応力分布記憶部２０に記憶する(Ｓ１)。 The surface shape distortion amount calculation device performs surface shape distortion amount calculation and surface shape defect presence / absence determination according to the procedure shown in the flowchart of FIG. First, the operator sets molding processing conditions in the processing condition input unit 10. The molding process simulation execution unit 15 executes a simulation program and pseudo-processes the molded product under the set molding process conditions. The surface shape distortion amount calculating unit 25 calculates a stress distribution at an arbitrary processing time of the molded product processed by the forming process simulation executing unit 15. For example, if the molding process is a press process, the stress distribution of each part of the molded product at the end of the press process (the bottom dead center of the mold) is calculated. The calculated stress distribution is stored in the stress distribution storage unit 20 (S1).
面形状歪み量演算部２５は、応力分布記憶部２０に記憶されている応力分布を取り出し、その応力分布に基づいて被成形品の幅縮み量を演算する。なお、領域指定部３０で幅縮み量の演算対象領域が指定されているときには、面形状歪み量演算部２５は、指定されている演算対象領域に対して幅縮み量を演算する（Ｓ２）。 The surface shape distortion amount calculation unit 25 takes out the stress distribution stored in the stress distribution storage unit 20, and calculates the width shrinkage amount of the molded product based on the stress distribution. Note that when the calculation target region for the width reduction amount is specified by the region specifying unit 30, the surface shape distortion amount calculation unit 25 calculates the width reduction amount for the specified calculation target region (S2).
面形状歪み量演算部２５は、演算された幅縮み量が正であるのか負であるのかを判断し、幅縮み量が負であると判断された場合には被成形品に面形状不良があると判定する一方、幅縮み量が正であると判断された場合には被成形品には面形状不良がないと判定する（Ｓ３）。 The surface shape distortion amount calculation unit 25 determines whether the calculated width shrinkage amount is positive or negative, and if it is determined that the width shrinkage amount is negative, there is a surface shape defect in the product. On the other hand, if it is determined that the width shrinkage amount is positive, it is determined that the molded product has no surface shape defect (S3).
面形状歪み量演算部２５は、幅縮み量が負であると判断された場合に幅縮み量に基づいて被成形品各部の面形状歪み量を演算する。面形状歪み量は、幅縮み量と面形状歪み量との対応関係を示すテーブルを参照することによって演算する（Ｓ４）。 The surface shape distortion amount calculation unit 25 calculates the surface shape distortion amount of each part of the molded product based on the width shrinkage amount when it is determined that the width shrinkage amount is negative. The surface shape distortion amount is calculated by referring to a table showing the correspondence between the width shrinkage amount and the surface shape distortion amount (S4).
面形状歪み量演算部２５は、面形状不良有と判定したときにはその旨を判定結果表示部３５に表示させ、一方、面形状不良無と判定したときにはその旨を判定結果表示部３５に表示させる(Ｓ５)。 When it is determined that the surface shape is defective, the surface shape distortion amount calculation unit 25 displays that fact on the determination result display unit 35, while when it is determined that there is no surface shape defect, the surface result is displayed on the determination result display unit 35. (S5).
本発明にかかる成形加工シミュレーションにおける面形状歪み量演算方法及びその装置の概略の装置構成及び動作は以上のとおりである。次に、板材をプレス加工する場合の面形状歪み量演算装置の動作を、図３に示すフローチャートに基づいて詳細に説明する。 The apparatus configuration and operation of the surface shape distortion amount calculation method and apparatus in the molding process simulation according to the present invention are as described above. Next, the operation of the surface shape distortion amount calculation apparatus when pressing a plate material will be described in detail based on the flowchart shown in FIG.
まず、操作者は加工条件入力部１０に成形加工条件を設定する。加工条件入力部１０はキーボードなどの入力端末装置でも良いし、成形加工条件を記憶しているデータベースでも良い。プレス加工の場合、設定される成形加工条件は、板材の材質、厚さ、大きさ、強度、応力−ひずみ特性、プレス速度、加圧力などである。加工条件入力部１０にキーボードなどの入力端末装置を用いる場合には、これらの成形加工条件を操作者が手入力する。また、加工条件入力部１０にデータベースを用いる場合には、これらの成形加工条件をそのデータベースに記憶させておく(Ｓ１１)。成形加工シミュレーション実行部１５は、これから擬似的な加工をしようとする板材の成形加工条件を加工条件入力部１０から入力する(Ｓ１２)。成形加工シミュレーション実行部１５は、プレスのシミュレーションプログラムを実行し入力した成形加工条件で板材を擬似的にプレスする。例えば、図４(Ａ)に示してあるような正方形の板材を、同図(Ｂ)に示すような形状にプレス加工する(Ｓ１３)。 First, the operator sets molding processing conditions in the processing condition input unit 10. The processing condition input unit 10 may be an input terminal device such as a keyboard or a database storing molding processing conditions. In the case of press working, the molding process conditions to be set are the material, thickness, size, strength, stress-strain characteristics, press speed, pressure, and the like of the plate material. When an input terminal device such as a keyboard is used for the processing condition input unit 10, the operator manually inputs these molding processing conditions. Further, when a database is used for the processing condition input unit 10, these molding processing conditions are stored in the database (S11). The forming process simulation execution unit 15 inputs the forming process conditions of the plate material to be simulated from the processing condition input unit 10 (S12). The forming process simulation execution unit 15 executes a press simulation program and presses the plate material in a pseudo manner under the input forming process conditions. For example, a square plate material as shown in FIG. 4A is pressed into a shape as shown in FIG. 4B (S13).
面形状歪み量演算部２５は、成形加工シミュレーション実行部１５によってプレスされる板材において、金型が下死点に達したときの応力分布を演算する。応力分布は平面状の直交する２方向について求める。板材各部の１方向の応力はσ１として、また他方向の応力はσ２として求める。金型が下死点にあるときは板材に最大の応力がかかっており、プレスされた板材の形状は金型の形状に沿う形状であるので、下死点の応力分布は金型形状の修正をする場合のデータとしてはきわめて有用なものとなる。演算した応力分布は応力分布記憶部２０に記憶する。領域指定部３０で応力分布の演算対象領域が指定されているときには、面形状歪み量演算部２５は、指定されている演算対象領域に対して演算する。なお、成形加工シミュレーションにおいて演算する応力分布は従来から一般的に用いられている方法を用いているので、その方法の詳しい説明は省略する（Ｓ１４）。 The surface shape distortion amount calculation unit 25 calculates the stress distribution when the mold reaches the bottom dead center in the plate material pressed by the molding process simulation execution unit 15. The stress distribution is determined in two planar directions that are perpendicular to each other. The stress in one direction of each part of the plate material is obtained as σ1, and the stress in the other direction is obtained as σ2. When the mold is at the bottom dead center, the maximum stress is applied to the plate, and the shape of the pressed plate conforms to the shape of the mold, so the stress distribution at the bottom dead center is a correction of the mold shape. It is extremely useful as data when performing The calculated stress distribution is stored in the stress distribution storage unit 20. When the calculation target region of the stress distribution is specified by the region specifying unit 30, the surface shape distortion amount calculating unit 25 calculates the specified calculation target region. In addition, since the stress distribution calculated in the molding process simulation uses a method generally used conventionally, detailed description of the method is omitted (S14).
面形状歪み量演算部２５は、応力分布記憶部２０に記憶されている応力分布σ１、σ２を取り出し、この応力分布から下死点の伸び分布変化率、すなわち幅縮み量Δε２を求める。応力分布σ１、σ２から幅縮み量Δε２を求めるためには、理論的な関係式、実験などから得られた経験式などを用いることができる。本実施の形態では、下記のような理論的な関係式を用いて幅縮み量Δε２を算出した。 Surface shape distortion amount calculating unit 25, the stress distribution σ1 stored in the stress distribution storage unit 20, retrieves the .sigma. @ 2, elongation distribution rate of change of the bottom dead center from the stress distribution, i.e. determining the width contraction amount [Delta] [epsilon] 2. In order to obtain the width shrinkage amount Δε 2 from the stress distributions σ 1 and σ 2 , theoretical relational expressions, empirical expressions obtained from experiments, and the like can be used. In the present embodiment, the width shrinkage amount Δε 2 is calculated using the following theoretical relational expression.
上記の各関係式から最終的に幅縮み量Δε２を算出するためには、次のような手順で求める。 In order to finally calculate the width reduction amount Δε 2 from each of the above relational expressions, the following procedure is used.
まず、σ１、σ２からαの値を求め、あらかじめ与えられているｒ値からＲの値を求める。次に、求められたαの値とＲの値とに基づいてβの値を演算する。さらに、Ｒの値、βの値、あらかじめ与えられているｎ値、ｕｅｌ値、ＴＳ値に基づいてＫ（β）の値を求め。そして、求められたＫ（β）の値、σ１、ｎ値に基づいてΔε１の値を求め、求められたΔε１の値とβの値とからΔε２の値を求める（Ｓ１５）。 First, the value of α is obtained from σ1 and σ2, and the value of R is obtained from an r value given in advance. Next, the value of β is calculated based on the obtained α value and R value. Further, the value of K (β) is obtained based on the value of R, the value of β, the n value given in advance, the uel value, and the TS value. Then, the value of Δε 1 is obtained based on the obtained K (β) value, σ1, and n value, and the value of Δε 2 is obtained from the obtained Δε 1 value and β value (S15).
面形状歪み量演算部２５は、板材の各部（微小部分）について、求めた幅縮み量Δε２が正であるか負であるかを判断する（Ｓ１６）。幅縮み量Δε２が正であると判断されたときには（Ｓ１６：ＹＥＳ）、板材のその微小部分では歪みが時間の進行とともにその板材を引き伸ばす方向に生じてきたと考えられるので、正常なプレスが行われたことになり、面形状不良はないと判定する（Ｓ１７）。一方、幅縮み量Δε２が負であると判断されたときには（Ｓ１６：ＮＯ）、板材のその微小部分では歪みが時間の進行とともにその板材を縮める方向に生じてきたと考えられるので、異常なプレスが行われたことになり、面形状不良があると判定する（Ｓ１８）。 The surface shape distortion amount calculation unit 25 determines whether the obtained width shrinkage amount Δε 2 is positive or negative for each portion (small portion) of the plate (S16). When it is determined that the width shrinkage amount Δε 2 is positive (S16: YES), it is considered that distortion occurs in the minute portion of the plate material in the direction in which the plate material is stretched over time. It is determined that there is no surface shape defect (S17). On the other hand, when the width contraction amount [Delta] [epsilon] 2 is determined to be negative (S16: NO), it is considered that distortion has occurred in the direction to shorten the sheet material with the progress of time at that minute portion of the plate, abnormal press Therefore, it is determined that there is a surface shape defect (S18).
面形状歪み量演算部２５は、面形状不良（しわや面ひずみなど）があると判定したときには、その面形状歪み量がどの程度あるかを演算する。この演算は次のようにして行う。面形状歪み量演算部２５は、自己が有している図５に示すような幅縮み量Δε２と面形状歪み量Ｈとの対応関係を示すテーブルを参照し、求められた幅縮み量Δε２に対応する面形状歪み量Ｈを求める。たとえば、図５に示すように、幅縮み量Δε２の値がＡであったとした場合、このＡの値に対応するＨＡがその面形状歪み量の値となる。したがって、幅縮み量Δε２の値から面形状歪み量Ｈの値を定量的に求めることができる（Ｓ１９）。 When it is determined that there is a surface shape defect (such as wrinkles or surface strain), the surface shape distortion amount calculation unit 25 calculates how much the surface shape distortion amount is. This calculation is performed as follows. The surface shape distortion amount calculation unit 25 refers to a table showing the correspondence between the width shrinkage amount Δε 2 and the surface shape distortion amount H as shown in FIG. A surface shape distortion amount H corresponding to 2 is obtained. For example, as shown in FIG. 5, when the value of the width contraction amount [Delta] [epsilon] 2 is that a A, H A corresponding to the value of the A is the value of the surface shape strain. Therefore, the value of the surface shape distortion amount H can be obtained quantitatively from the value of the width shrinkage amount Δε 2 (S19).
面形状歪み量演算部２５は、面形状不良なしと判定したときにはその旨を判定結果表示部３５に表示させ、面形状不良（しわや面ひずみなど）があると判定したときには、その旨と面形状歪み量を判定結果表示部３５に表示させる（Ｓ２１）。この表示は、板材の微小部分ごとに分けて行われる。例えば、自動車の車体パネルをプレスするシミュレーションに対して本発明の方法を適用すると、判定結果表示部３５には、図６に示すように面形状不良発生の有無が面形状不良なしと判定された部分と面形状不良ありと判定された部分が色分けされた画像として表示され、そして面形状不良が発生している部分については図７のように面形状歪み量の程度に応じて色が異なる画像として表示される（Ｓ２０）。 When it is determined that there is no surface shape defect, the surface shape distortion amount calculation unit 25 displays that fact on the determination result display unit 35, and when it is determined that there is a surface shape defect (such as wrinkles or surface distortion), that fact and surface. The shape distortion amount is displayed on the determination result display unit 35 (S21). This display is performed separately for each minute portion of the plate material. For example, when the method of the present invention is applied to a simulation of pressing a car body panel of an automobile, the determination result display unit 35 determines that there is no surface shape defect as shown in FIG. An image in which a portion and a portion determined to have a surface shape defect are displayed as color-coded images, and for a portion in which a surface shape failure has occurred, an image having a different color depending on the degree of surface shape distortion as shown in FIG. Is displayed (S20).
以上、本発明にかかる成形加工シミュレーションにおける面形状歪み量演算方法およびその装置によれば、成形加工シミュレーションを用いて板材を塑性変形させたとき、その板材に面形状不良が生じるか否かを正確に判定することができるのみならず、どの程度の面形状不良が発生しているのかを定量的に求めることができる。 As described above, according to the method and apparatus for calculating the surface shape distortion in the forming process simulation according to the present invention, when the plate material is plastically deformed using the forming process simulation, it is accurately determined whether or not a surface shape defect occurs in the plate material. It is possible to quantitatively determine how many surface shape defects have occurred.
また、応力分布の演算対象領域を指定した場合には、演算の対象領域が制限されるので、面形状不良有無および面形状不良の程度の判定の処理を高速化することができる。 In addition, when the calculation target area of the stress distribution is designated, the calculation target area is limited, so that the process of determining the presence / absence of the surface shape defect and the degree of the surface shape defect can be speeded up.
さらに、判定結果を表示するようにした場合には、面形状不良が生じる恐れのある領域と面形状不良が生じることのない領域を一目瞭然に表示することができるので、金型製作に入る前に金型形状の変更が必要な部分および変更の程度を詳細に判断することができる。 In addition, when the determination result is displayed, the area where the surface shape defect may occur and the area where the surface shape defect does not occur can be clearly displayed. It is possible to determine in detail the portion that needs to be changed and the degree of change.
板材を塑性変形させたときにその板材にどの程度の面形状歪みが生じるのかを正確に演算することができるので、成形加工シミュレーションにおいてプレス金型の形状を微調整する場合に有用である。 Since it is possible to accurately calculate how much surface shape distortion occurs in the plate material when the plate material is plastically deformed, it is useful when finely adjusting the shape of the press die in the molding process simulation.
１０ 加工条件入力部、
１５ 成形加工シミュレーション実行部、
２０ 応力分布記憶部、
２５ 面形状歪み量演算部、
３０ 領域指定部、
３５ 判定結果表示部。
10 Processing condition input part,
15 molding processing simulation execution unit,
20 stress distribution storage unit,
25 Surface shape distortion amount calculation unit,
30 area designation part,
35 judgment result display part.
Claims (10)
演算された応力分布に基づいて前記被成形品の幅縮み量を演算する段階と、
演算された幅縮み量に基づいて前記被成形品各部の面形状歪み量を演算する段階と、
を含むことを特徴とする成形加工シミュレーションにおける面形状歪み量演算方法。 Calculating a stress distribution of the molded article at an arbitrary processing time by pseudo-processing the molded article under the set molding processing conditions;
Calculating a width shrinkage amount of the molding based on the calculated stress distribution;
Calculating the surface shape distortion amount of each part of the molded product based on the calculated width shrinkage amount;
A method for calculating a surface shape distortion amount in a molding process simulation.
演算された幅縮み量が正であるのか負であるのかを判断する段階と、
幅縮み量が負であると判断された場合に前記面形状歪み量を演算する段階と、
を含むことを特徴とする請求項１に記載の成形加工シミュレーションにおける面形状歪み量演算方法。 The step of calculating the surface shape distortion amount includes:
Determining whether the computed width shrinkage is positive or negative;
Calculating the surface shape distortion amount when it is determined that the width shrinkage amount is negative;
The surface shape distortion amount calculation method in the forming process simulation according to claim 1, wherein
前記面形状不良の有無の判定結果を表示する段階と、
をさらに含むことを特徴とする請求項４に記載の成形加工シミュレーションにおける面形状歪み量演算方法。 When it is determined that the width shrinkage amount is negative, it is determined that the molded product has a surface shape defect. On the other hand, when it is determined that the width shrinkage amount is positive, the molded product is Determining that there is no surface shape defect;
Displaying a determination result of presence or absence of the surface shape defect;
The method for calculating the surface shape distortion amount in the molding process simulation according to claim 4, further comprising:
設定された成形加工条件で被成形品を擬似的に加工する加工手段と、
任意の加工時点における前記被成形品の応力分布を演算する応力分布演算手段と、
演算された応力分布を記憶する応力分布記憶手段と、
記憶されている応力分布に基づいて前記被成形品の幅縮み量を演算する幅縮み量演算手段と、
演算された幅歪み量から前記被成形品各部の面形状歪み量を演算する面形状歪み量演算手段と、
を有することを特徴とする成形加工シミュレーションにおける面形状歪み量演算装置。 Setting means for setting molding processing conditions;
A processing means for processing a workpiece in a simulated manner under set molding processing conditions;
Stress distribution calculating means for calculating the stress distribution of the molded article at an arbitrary processing time;
Stress distribution storage means for storing the calculated stress distribution;
A width reduction amount calculating means for calculating the width reduction amount of the molded article based on the stored stress distribution;
Surface shape distortion amount calculating means for calculating the surface shape distortion amount of each part of the molded product from the calculated width distortion amount;
A surface shape distortion amount calculation apparatus in a molding process simulation.
前記幅縮み量と前記面形状歪み量との対応関係を示すテーブルを有し、
当該テーブルを参照することによって前記演算された幅縮み量から前記被成形品各部の面形状歪み量を演算することを特徴とする請求項６に記載の成形加工シミュレーションにおける面形状歪み量演算装置。 Surface shape distortion amount calculation means,
A table showing a correspondence relationship between the width shrinkage amount and the surface shape distortion amount;
The surface shape distortion amount calculation device in the molding process simulation according to claim 6, wherein the surface shape distortion amount of each part of the molded product is calculated from the calculated width shrinkage amount by referring to the table.
演算された幅縮み量が負である場合に前記面形状歪み量を演算することを特徴とする請求項６に記載の成形加工シミュレーションにおける面形状歪み量演算装置。 The surface shape distortion amount calculating means includes:
The surface shape distortion amount calculation device in the molding process simulation according to claim 6, wherein the surface shape distortion amount is calculated when the calculated width shrinkage amount is negative.
演算された幅縮み量が負である場合に前記被成形品に面形状不良があると判定する一方、前記幅縮み量が正で場合に前記被成形品には面形状不良がないと判定する機能をさらに有することを特徴とする請求項６に記載の成形加工シミュレーションにおける面形状歪み量演算装置。 The surface shape distortion amount calculating means includes:
When the calculated width shrinkage amount is negative, it is determined that the molded product has a surface shape defect. On the other hand, when the width shrinkage amount is positive, it is determined that the molded product has no surface shape failure. The apparatus for calculating a surface shape distortion amount in the molding process simulation according to claim 6, further comprising a function.
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