JP2012086255A - Method of calculating load of press forming - Google Patents

Method of calculating load of press forming Download PDF

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JP2012086255A
JP2012086255A JP2010236483A JP2010236483A JP2012086255A JP 2012086255 A JP2012086255 A JP 2012086255A JP 2010236483 A JP2010236483 A JP 2010236483A JP 2010236483 A JP2010236483 A JP 2010236483A JP 2012086255 A JP2012086255 A JP 2012086255A
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press
molding load
bottom dead
load
simulation
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JP5610574B2 (en
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Masahiko Fukushima
正彦 福島
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Daihatsu Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To accurately calculate a forming load of press working by a simulation.SOLUTION: The method of calculating a load of press forming includes a first step of obtaining a forming load-calculated value at a stroke position before a press bottom dead point by the simulation with respect to a plurality of kinds of sample parts, a second step of obtaining a correlated approximate expression between the forming load-calculated value of the plurality of the kinds of the sample parts and a forming load in an actual machine, a third step of obtaining the forming load-calculated value at the stroke position of an object part by the simulation, and a forth step of calculating the forming load at the press bottom dead point of the object part by substituting the forming load-calculated value of the object part for the correlated approximate expression.

Description

本発明は、プレス加工における成形荷重をシミュレーションにより計算する方法に関する。   The present invention relates to a method for calculating a forming load in press working by simulation.

例えば自動車の生産設備において、設備費用などのコストに対して生産能力が見合うものかどうか、あるいは、生産能力に対して設備が過剰となっていないかどうかを評価することは非常に重要である。例えば特許文献1には、生産ラインの計画に対して生産能力と投資費用とが最適となる設備が自動的に選択される生産ライン計画支援装置が示されている。   For example, in an automobile production facility, it is very important to evaluate whether the production capacity is commensurate with the cost such as the facility cost or whether the facility is excessive with respect to the production capacity. For example, Patent Document 1 discloses a production line planning support apparatus that automatically selects a facility that optimizes production capacity and investment cost with respect to a production line plan.

特開2006−31360号公報JP 2006-31360 A

ところで、新たなプレス成形部品の生産を開始する際や、既存のプレス成形部品の材質を変更する際に、当該部品のプレス成形荷重を計算し、適当なプレス機に引き当てることは重要である。もし、生産を開始した後、当該部品に対してプレス機の能力(成形荷重)が不足していれば、生産を中止してプレス機を変更する必要が生じる。一方、当該部品に対してプレス機の能力が過剰であれば、必要以上に能力の高いプレス機を用いていることとなり、設備コストが高騰する。   By the way, when starting production of a new press-molded part or changing the material of an existing press-molded part, it is important to calculate the press-molding load of the part and apply it to an appropriate press machine. If the capacity of the press machine (molding load) is insufficient for the part after starting production, it is necessary to stop the production and change the press machine. On the other hand, if the capacity of the press machine is excessive with respect to the part, a press machine having a higher capacity than necessary is used, and the equipment cost increases.

部品のプレス成形荷重に見合った適当な能力のプレス機に引き当てるためには、生産の計画段階で当該部品のプレス成形荷重を正確に求めることが重要となる。従来は、例えば技術者の手計算により部品のプレス成形荷重が求められていたが、部品の形状が複雑になったり、材料が硬質化すると、プレス成形荷重を手計算により求めることは難しい。   In order to attract a press having an appropriate capacity corresponding to the press forming load of the part, it is important to accurately obtain the press forming load of the part at the production planning stage. Conventionally, for example, the press molding load of a part has been obtained by manual calculation by an engineer. However, when the shape of the part becomes complicated or the material becomes hard, it is difficult to obtain the press molding load by manual calculation.

そこで、部品のプレス加工をコンピュータを用いてシミュレーションし、このシミュレーションによりプレス成形荷重を計算する方法が検討されている。しかしながら、シミュレーションによるプレス成形荷重の計算値は実際のプレス成形荷重と大きく異なることが多く、信頼性に欠けるとして実際には適用されておらず、その原因も明らかになっていなかった。   In view of this, a method of simulating the press working of a part using a computer and calculating the press forming load by this simulation has been studied. However, the calculated value of the press forming load by simulation often differs greatly from the actual press forming load, and it has not been applied in practice because it lacks reliability, and the cause has not been clarified.

本発明は、プレス加工における成形荷重をシミュレーションにより正確に計算することを目的とする。   An object of the present invention is to accurately calculate a forming load in press working by simulation.

本発明者は、シミュレーションによるプレス成形荷重の計算値が不正確である原因が、以下のものであることを見出した。すなわち、シミュレーションは、金型表面や板金材料を微小な平面に分割した擬似形状を用いて行うため、実際の形状と完全には一致していない。このようなシミュレーションにおけるワークの形状と実際のワークの形状との差に起因して、シミュレーションでは実際には加わっていない大きな荷重が加わっていると見なされ、この仮想的な荷重によりプレス成形荷重の計算値に大きな狂いが生じていた。   The present inventor has found that the reason why the calculated value of the press forming load by simulation is inaccurate is as follows. That is, since the simulation is performed using a pseudo shape obtained by dividing the mold surface and the sheet metal material into minute planes, the simulation does not completely match the actual shape. Due to the difference between the workpiece shape and the actual workpiece shape in such a simulation, it is considered that a large load that is not actually applied is applied in the simulation. There was a big upset in the calculated values.

上記の不具合を詳しく説明する。図3(a)は、シミュレーションによるプレス成形を概念的に示す図であり、特にワークの曲面部をプレス成形する様子を示す。例えば有限要素法によるシミュレーションでは、図示のように、擬似金型(固定型1及び可動型2)の曲面状の成形面や、板金からなる擬似ワーク3が、メッシュ状に分割した複数の微小平面で表される。図3(b)に示すプレス後期では、固定型1と可動型2との間隔が狭まり、この間に配置された擬似ワーク3と擬似金型(図示では固定型1)とが干渉する領域が生じる(図3(b)に点線で示す)。このような場合、シミュレーションでは擬似ワーク3を構成する各微小平面を湾曲させることはできないため、実際には加わっていない力を擬似ワーク3に加えて、擬似金型と擬似ワーク3との干渉を回避しようとする。プレス機が下死点(ストローク0)に近づくほど、固定型1と可動型2との間隔が狭まり、擬似金型と擬似ワーク3とが干渉領域が大きくなるため、擬似ワーク3に加わる仮想的な力が大きくなる。特に、成形品の曲面部の曲率が大きい場合(曲率半径が小さい場合)、擬似ワーク3を曲面に沿わせることが難しくなるため、擬似ワーク3に加わる仮想的な力が大きくなる。   The above problems will be described in detail. FIG. 3A is a diagram conceptually illustrating press forming by simulation, and particularly shows a state in which a curved surface portion of a workpiece is press formed. For example, in the simulation by the finite element method, as shown in the figure, a curved molding surface of a pseudo mold (fixed mold 1 and movable mold 2) and a pseudo work 3 made of a sheet metal are divided into a plurality of minute planes divided into mesh shapes. It is represented by In the latter half of the press shown in FIG. 3B, the interval between the fixed mold 1 and the movable mold 2 is narrowed, and an area in which the pseudo work 3 and the pseudo mold (the fixed mold 1 in the drawing) arranged therebetween interfere with each other is generated. (Indicated by a dotted line in FIG. 3B). In such a case, since it is impossible to bend each micro-plane constituting the pseudo work 3 in the simulation, a force that is not actually applied is applied to the pseudo work 3 to cause interference between the pseudo mold and the pseudo work 3. Try to avoid. As the pressing machine approaches the bottom dead center (stroke 0), the distance between the fixed mold 1 and the movable mold 2 is reduced, and the interference area between the pseudo mold and the pseudo work 3 increases, so that the virtual work applied to the pseudo work 3 is increased. Power increases. In particular, when the curvature of the curved surface portion of the molded product is large (when the curvature radius is small), it becomes difficult to place the pseudo work 3 along the curved surface, so that a virtual force applied to the pseudo work 3 increases.

また、実際のプレス成形では、図4に示すように、プレス後期にワーク3’(実線)にシワ4’が生じることがある。微小平面に分割した擬似ワークでは、上記のようなワーク3’に生じる微妙のシワ4’を表現することができないため、図4に鎖線で示すように、擬似ワーク3が大きく屈曲して金型(図示例では可動型2’)にめり込んだ形状となることがある。この状態を矯正するために、シミュレーションでは擬似ワーク3に極めて大きな仮想の力が加わる。   In actual press forming, as shown in FIG. 4, wrinkles 4 'may occur in the workpiece 3' (solid line) in the latter half of the press. In the pseudo work divided into the minute planes, the fine wrinkles 4 'generated in the work 3' as described above cannot be expressed. Therefore, as shown by the chain line in FIG. (In the example shown, the movable mold 2 'may be indented). In order to correct this state, an extremely large virtual force is applied to the pseudo work 3 in the simulation.

例えば、擬似金型や擬似ワークの分割メッシュを極めて細かくすれば、実際の状態に近づけることができ、上記のような擬似ワークに加わる仮想的な力を低減できると考えられる。しかし、特に有限要素法によるシミュレーションの場合、擬似ワークの分割メッシュの大きさは擬似ワークの板厚よりも大きくするという制限があるため、分割メッシュはそれ程細分化できず、プレス下死点付近で擬似ワークに仮想的な力が加わることは避けられない。   For example, if the pseudo mold or the mesh of the pseudo work is made very fine, it can be brought closer to the actual state, and the virtual force applied to the pseudo work as described above can be reduced. However, especially in the case of simulation by the finite element method, there is a limitation that the size of the divided mesh of the pseudo work is larger than the thickness of the pseudo work, so the divided mesh cannot be subdivided so much, and near the press bottom dead center. It is inevitable that virtual force is applied to the pseudo work.

プレス成形荷重を計算するにあたっては、プレスが完了するプレス下死点における値を求める必要があるが、上記の考察から、シミュレーションによる成形荷重の計算値は、プレス下死点において実際の成形荷重から最も大きく離れることが明らかとなった。換言すれば、プレス下死点より手前のストローク位置における成形荷重の計算値は、少なくともプレス下死点における計算値よりも信頼性が高いと言える。本発明者はこの点に着目し、以下の発明に至った。   In calculating the press forming load, it is necessary to obtain the value at the bottom dead center of the press where the press is completed. From the above consideration, the calculated value of the forming load by simulation is calculated from the actual forming load at the bottom dead center of the press. It became clear that the biggest difference. In other words, it can be said that the calculated value of the molding load at the stroke position before the press bottom dead center is more reliable than the calculated value at least at the press bottom dead center. The inventor has focused on this point and has reached the following invention.

すなわち、本発明は、対象部品のプレス下死点における成形荷重を計算するための方法であって、複数種のサンプル部品について、プレス下死点より手前のストローク位置における成形荷重計算値をシミュレーションにより求める第1ステップと、複数種のサンプル部品の成形荷重計算値と実機における成形荷重との間の相関近似式を求める第2ステップと、シミュレーションにより上記のストローク位置における対象部品の成形荷重計算値を求める第3ステップを、対象部品の成形荷重計算値を相関近似式に代入することにより、対象部品のプレス下死点における成形荷重を計算する第4ステップとを有するものである。   That is, the present invention is a method for calculating a molding load at a press bottom dead center of a target part, and for a plurality of types of sample parts, a molding load calculation value at a stroke position before the press bottom dead center is calculated by simulation. A first step to obtain, a second step to obtain a correlation approximate expression between a molding load calculation value of a plurality of types of sample parts and a molding load in an actual machine, and a molding load calculation value of the target part at the above stroke position by simulation. The obtained third step includes a fourth step of calculating a molding load at the press bottom dead center of the target part by substituting the molding load calculation value of the target part into the correlation approximation formula.

このように、本発明のプレス成形荷重の計算方法は、プレス下死点より手前のストローク位置における成形荷重(プレス成形完了前の成形荷重)をシミュレーションにより計算し、この成形荷重計算値に基づいてプレス下死点における成形荷重(プレス成形完了時の成形荷重)を求めるものである。このように、比較的信頼性の高いプレス下死点より手前のストローク位置における成形荷重計算値に基づいて、プレス下死点における成形荷重を求めることで、信頼性の高い結果を得ることができる。   As described above, the calculation method of the press molding load of the present invention calculates the molding load at the stroke position before the press bottom dead center (molding load before completion of press molding) by simulation, and based on this molding load calculation value. The molding load at the bottom dead center of the press (molding load at the time of completion of press molding) is obtained. Thus, by obtaining the molding load at the press bottom dead center based on the molding load calculation value at the stroke position before the press bottom dead center with relatively high reliability, a highly reliable result can be obtained. .

ところで、シミュレーションにより成形荷重計算値を求めるストローク位置がプレス下死点に近すぎると、上述のように、擬似ワークに大きな仮想力が加わるため、成形荷重計算値が実機における成形荷重を大幅に上回ってしまう。一方、シミュレーションにより成形荷重計算値を求めるストローク位置がプレス下死点から遠すぎると、プレス成形による加工量が小さく成形荷重計算値も小さくなるため、当該ストローク位置における成形荷重計算値が、実機のプレス下死点における成形荷重を大幅に下回ってしまう。以上のように、シミュレーションにより成形荷重計算値を求めるストローク位置がプレス下死点に対して近すぎても遠すぎても、当該ストローク位置における成形荷重計算値と実機における成形荷重との相関関係が弱くなるため、この相関関係に基づいて求められる対象部品の成形荷重の信頼性が低くなる。   By the way, if the stroke position at which the molding load calculation value is calculated by simulation is too close to the press bottom dead center, a large virtual force is applied to the pseudo workpiece as described above, so the molding load calculation value greatly exceeds the molding load in the actual machine. End up. On the other hand, if the stroke position at which the molding load calculation value is obtained by simulation is too far from the bottom dead center of the press, the amount of processing by press molding is small and the molding load calculation value is small, so the molding load calculation value at the stroke position is The molding load at the bottom dead center of the press will be significantly below. As described above, even if the stroke position at which the molding load calculation value is obtained by simulation is too close or too far from the press bottom dead center, the correlation between the molding load calculation value at the stroke position and the molding load in the actual machine is Since it becomes weak, the reliability of the molding load of the target part calculated | required based on this correlation becomes low.

そこで、上記のプレス成形荷重の計算方法の第1ステップで、プレス下死点より手前の複数のストローク位置における成形荷重計算値を求め、第2ステップで、複数のストローク位置ごとに相関近似式を求め、こうして求めた複数の相関近似式のうち、最も相関係数の大きい相関近似式を選択すれば、成形荷重計算値と実機のプレス下死点における成形荷重との相関の高い最適なストローク位置を選定することができる。こうして選択した最適なストローク位置の相関近似式に基づいて、第4のステップを行うようにすればよい。   Therefore, in the first step of the above-described press molding load calculation method, molding load calculation values at a plurality of stroke positions before the press bottom dead center are obtained, and in the second step, a correlation approximation formula is calculated for each of the plurality of stroke positions. If the correlation approximation formula having the largest correlation coefficient is selected from the plurality of correlation approximation formulas thus obtained, the optimum stroke position with a high correlation between the molding load calculation value and the molding load at the press bottom dead center of the actual machine Can be selected. The fourth step may be performed based on the correlation approximation formula of the optimum stroke position thus selected.

以上のように、本発明のプレス成形荷重の計算方法では、プレス下死点より手前の成形荷重計算値に基づいてプレス下死点における成形荷重を計算することで、信頼性の高い結果を得ることができる。   As described above, in the press molding load calculation method of the present invention, a highly reliable result is obtained by calculating the molding load at the press bottom dead center based on the molding load calculation value before the press bottom dead center. be able to.

複数のサンプル部品のプレス成形シミュレーションにおけるストローク位置と成形荷重計算値との関係をプロットしたグラフである。It is the graph which plotted the relationship between the stroke position in the press molding simulation of several sample components, and a molding load calculation value. 各ストローク位置におけるサンプル部品の成形荷重計算値と実機における成形荷重との関係をプロットし、その相関近似式を示すグラフである。It is a graph which plots the relationship between the molding load calculation value of the sample parts in each stroke position, and the molding load in an actual machine, and shows the correlation approximate expression. (a)はシミュレーションによるプレス加工を概念的に示す断面図であり、(b)は(a)図のプレス下死点付近における断面図である。(A) is sectional drawing which shows the press work by simulation notionally, (b) is sectional drawing in the press bottom dead center vicinity of (a) figure. プレス後期にワークにシワが生じる様子を示す断面図である。It is sectional drawing which shows a mode that wrinkles arise in a workpiece | work in the latter half of press.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

本発明の一実施形態に係るプレス成形荷重の計算方法は、(1)サンプル部品の成形荷重シミュレーション、(2)相関近似式の算出(最適な相関近似式の選択)、(3)対象部品の成形荷重の計算を経て行われる。以下、各工程を順に説明する。   The method of calculating the press forming load according to one embodiment of the present invention includes (1) simulation of forming load of sample parts, (2) calculation of correlation approximation formula (selection of optimum correlation approximation formula), and (3) calculation of target part. This is done through the calculation of the molding load. Hereinafter, each process is demonstrated in order.

(1)サンプル部品の成形荷重シミュレーション(第1ステップ)
まず、材質や形状が異なる複数種のサンプル部品を用意する。本実施形態では6種のサンプル部品A〜Fを用意した。これらのサンプル部品A〜Fについて、例えば有限要素法によるプレス加工のシミュレーションを行い、プレス下死点より手前のストローク位置における成形荷重を計算する。本実施形態では、複数のストローク位置における成形荷重を計算し、具体的には0.1mmUP、0.3mmUP、0.5mmUP、1mmUP、2mmUP、3mmUPのストローク位置における成形荷重を計算した。尚、〜mmUPとは、可動型がプレス下死点より〜mm手前にあるストローク位置のことを言う。また、参考として、プレス下死点(0mmUP)における成形荷重も計算した。各サンプル部品A〜Fについて、ストローク位置と成形荷重計算値との関係をプロットしたグラフを図1に示す。
(1) Molding load simulation of sample parts (first step)
First, multiple types of sample parts with different materials and shapes are prepared. In this embodiment, six types of sample parts A to F are prepared. For these sample parts A to F, for example, a simulation of press working by a finite element method is performed, and a forming load at a stroke position before the press bottom dead center is calculated. In this embodiment, the molding load at a plurality of stroke positions was calculated, specifically, the molding load at the stroke positions of 0.1 mmUP, 0.3 mmUP, 0.5 mmUP, 1 mmUP, 2 mmUP, and 3 mmUP was calculated. In addition, ~ mmUP means a stroke position where the movable mold is ~ mm before the press bottom dead center. For reference, the molding load at the press bottom dead center (0 mm UP) was also calculated. A graph plotting the relationship between the stroke position and the molding load calculation value for each of the sample parts A to F is shown in FIG.

(2)相関近似式の算出(第2ステップ)
次に、各ストローク位置における各サンプル部品A〜Fの成形荷重計算値と実機の成形荷重との関係をプロットする。本実施形態では、上記のストローク位置のうち、0mmUP、0.5mmUP、1mmUP、3mmUPの4箇所における関係をプロットし、その結果を図2に示す。このプロットから、各ストローク位置における成形荷重計算値と実機の成形荷重との相関近似式を、例えば回帰分析により求める。本実施形態では、プロットを1次式で近似した場合を示している。
(2) Calculation of correlation approximation formula (second step)
Next, the relationship between the molding load calculation value of each sample part A to F at each stroke position and the molding load of the actual machine is plotted. In this embodiment, among the above stroke positions, the relationships at four locations of 0 mmUP, 0.5 mmUP, 1 mmUP, and 3 mmUP are plotted, and the results are shown in FIG. From this plot, a correlation approximate expression between the molding load calculation value at each stroke position and the molding load of the actual machine is obtained by, for example, regression analysis. In this embodiment, the case where the plot is approximated by a linear expression is shown.

そして、図2の各ストローク位置における相関近似式のうち、プロットとの相関が最も高いものを選択する。具体的には、各相間近似式の相関係数を求め、最も相関係数が高いものを選択する。本実施形態では、各相関近似式の回帰分析による決定係数R2(R:相関係数)を求める。その結果、図2のグラフ中に示すように、0mmUPではR2=0.29、0.5mmUPではR2=0.76、1mmUPではR2=0.83、3mmUPではR2=0.67となった。この結果から、プレス下死点より手前のストローク位置(0.5mmUP、1mmUP、3mmUP)における相関近似式の相関係数は、プレス下死点(0mmUP)における相関近似式の相関係数よりもはるかに大きいことが確認できる。中でも、1mmUPのストローク位置における相関近似式の相関係数が最も大きいため、この相関近似式を選択する。 Then, the correlation approximation formula at each stroke position in FIG. 2 is selected that has the highest correlation with the plot. Specifically, the correlation coefficient of each interphase approximate expression is obtained, and the one with the highest correlation coefficient is selected. In the present embodiment, a determination coefficient R 2 (R: correlation coefficient) is obtained by regression analysis of each correlation approximation formula. As a result, as shown in the graph of FIG. 2, R 2 = 0.29 for 0 mm UP, R 2 = 0.76 for 0.5 mm UP, R 2 = 0.83 for 1 mm UP, and R 2 = 0.67 for 3 mm UP. It became. From this result, the correlation coefficient of the correlation approximation formula at the stroke position (0.5 mmUP, 1 mmUP, 3 mmUP) before the press bottom dead center is far greater than the correlation coefficient of the correlation approximation formula at the press bottom dead center (0 mmUP). It can be confirmed that it is large. In particular, since the correlation coefficient of the correlation approximate expression at the stroke position of 1 mm UP is the largest, this correlation approximate expression is selected.

(3)対象部品の成形荷重の計算
次に、対象部品についてプレス加工のシミュレーションを行い、上記の工程で選択した相関近似式のストローク位置(1mmUP)における成形荷重を計算する(第3ステップ)。そして、この対象部品の成形荷重計算値を、上記の工程で選択した相関近似式に代入することにより、対象部品のプレス下死点における成形荷重の計算値が得られる(第4ステップ)。
(3) Calculation of forming load of target part Next, press work simulation is performed on the target part, and the forming load at the stroke position (1 mm UP) of the correlation approximation formula selected in the above-described process is calculated (third step). Then, the calculated molding load value of the target part at the press bottom dead center of the target part is obtained by substituting the calculated molding load value of the target part into the correlation approximation formula selected in the above process (fourth step).

上記の計算方法では、対象部品のプレス下死点における成形荷重をシミュレーションにより直接求めるのではなく、比較的信頼性の高いプレス下死点より手前のストローク位置における計算値に基づいて求めるため、信頼性の高い結果が得られる。これにより、対象部品のプレス成形荷重を正確に求めることができるため、例えば新たな部品の生産を開始する場合や、既存の部品の材質を変更する場合などに、当該部品の成形に適当な能力のプレス機を引き当てることができる。これにより、プレス機の能力不足による引き当て機の変更や、プレス機の能力過剰による設備コストの高騰を回避することができる。   In the above calculation method, the molding load at the press bottom dead center of the target part is not directly calculated by simulation, but is calculated based on the calculated value at the stroke position before the press bottom dead center with relatively high reliability. High results are obtained. This makes it possible to accurately determine the press molding load of the target part, so that, for example, when the production of a new part is started or when the material of an existing part is changed, the appropriate capacity for molding the part Can press the press machine. As a result, it is possible to avoid a change in the allocation machine due to insufficient capacity of the press and an increase in equipment cost due to excessive capacity of the press.

本発明は上記の実施形態に限られない。例えば、上記の実施形態では、複数のストローク位置において相関近似式を求めた後、最も相関の強い相関近似式を選択する場合を示したが、必ずしも複数のストローク位置において相関近似式を求める必要はなく、経験的に選択した一箇所のストローク位置(例えば1mmUP)における相関近似式のみを求めてもよい。この場合、最も相関の強い相関近似式を選択するステップは省略される。ただし、上記のように、複数のストローク位置の相関近似式から最適なものを選択する方が、より正確な成形荷重を求めることができるため好ましい。   The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the correlation approximation formula having the strongest correlation is selected after obtaining the correlation approximation formula at a plurality of stroke positions is shown. Instead, only a correlation approximation expression at one stroke position (for example, 1 mm UP) selected empirically may be obtained. In this case, the step of selecting the correlation approximation expression having the strongest correlation is omitted. However, as described above, it is preferable to select the optimum one from the correlation approximation formulas of a plurality of stroke positions because a more accurate molding load can be obtained.

また、サンプル部品の形状や材質は任意であるが、例えば、特定の条件の下で複数種のサンプル部品を選定すれば、当該条件に適した相関近似式を算出することができるため、当該条件を満たす対象部品の成形荷重の信頼性をより一層高めることができる。例えば、対象部品が高張力鋼(ハイテン材)である場合、ハイテン材からなる複数種のサンプル部品を選択して相関近似式を算出すれば、ハイテン材に適した相関近似式を得ることができる。この他、部品の大きさの条件を設定することもできる。   The shape and material of the sample parts are arbitrary. For example, if multiple types of sample parts are selected under a specific condition, a correlation approximation expression suitable for the condition can be calculated. The reliability of the molding load of the target part that satisfies the requirements can be further increased. For example, when the target part is high-tensile steel (high-tensile material), a correlation approximation expression suitable for the high-tensile material can be obtained by selecting a plurality of types of sample parts made of high-tensile material and calculating the correlation approximation expression. . In addition to this, it is possible to set a condition for the size of the component.

1 固定型(擬似金型)
1’ 固定型
2 可動型(擬似金型)
2’ 可動型
3 擬似ワーク
3’ ワーク
4’ シワ
1 Fixed mold (pseudo mold)
1 'fixed mold 2 movable mold (pseudo mold)
2 'Movable type 3 Pseudo work 3' Work 4 'Wrinkle

Claims (2)

対象部品のプレス下死点における成形荷重を計算するための方法であって、
複数種のサンプル部品について、プレス下死点より手前のストローク位置における成形荷重計算値をシミュレーションにより求める第1ステップと、前記サンプル部品の成形荷重計算値と前記サンプル部品の実機における成形荷重との相関近似式を求める第2ステップと、対象部品の前記ストローク位置における成形荷重計算値をシミュレーションにより求める第3ステップと、前記対象部品の成形荷重計算値を前記相関近似式に代入することにより、前記対象部品のプレス下死点における成形荷重を計算する第4ステップとを有するプレス成形荷重の計算方法。
A method for calculating a forming load at a press bottom dead center of a target part,
A first step for obtaining a molding load calculation value at a stroke position before the press bottom dead center for a plurality of types of sample parts by simulation, and a correlation between the molding load calculation value of the sample part and the molding load of the sample part in the actual machine A second step of obtaining an approximate expression; a third step of obtaining a molding load calculation value at the stroke position of the target part by simulation; and substituting the molding load calculation value of the target part into the correlation approximation formula, And a fourth step of calculating a forming load at the press bottom dead center of the part.
前記第1ステップで、プレス下死点より手前の複数のストローク位置における前記複数のサンプル部品の成形荷重計算値を求め、前記第2ステップで、前記複数のストローク位置ごとに前記相関近似式を求め、
前記複数の相関近似式のうち、相関係数が最も大きい相関近似式を用いて前記第4のステップを行う請求項1のプレス成形荷重の計算方法。
In the first step, molding load calculation values of the plurality of sample parts at a plurality of stroke positions before the bottom dead center of the press are obtained, and in the second step, the correlation approximation formula is obtained for each of the plurality of stroke positions. ,
The method of calculating a press forming load according to claim 1, wherein the fourth step is performed using a correlation approximation expression having the largest correlation coefficient among the plurality of correlation approximation expressions.
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JPH0270326A (en) * 1988-09-06 1990-03-09 Nippon Gasket Kk Manufacture and apparatus for metallic gasket
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