JP4568077B2 - Press mold with excellent shape freezing - Google Patents

Press mold with excellent shape freezing Download PDF

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JP4568077B2
JP4568077B2 JP2004304843A JP2004304843A JP4568077B2 JP 4568077 B2 JP4568077 B2 JP 4568077B2 JP 2004304843 A JP2004304843 A JP 2004304843A JP 2004304843 A JP2004304843 A JP 2004304843A JP 4568077 B2 JP4568077 B2 JP 4568077B2
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JP2006116554A (en
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亨 吉田
栄志 磯貝
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新日本製鐵株式会社
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本発明は金属板のプレス成形装置に関するものであって、特に高強度鋼板やアルミニウム合金板などの場合に生ずるスプリングバックを防止して良好な形状凍結性を確保するためのプレス金型に関するものである。   The present invention relates to a press forming apparatus for a metal plate, and more particularly to a press die for preventing a spring back that occurs in the case of a high-strength steel plate or an aluminum alloy plate and ensuring good shape freezing. is there.
近年、自動車部品に高強度鋼板やアルミニウム合金板が多用されつつあるが、それらを自動車部品に成形する際に発生する形状凍結不良が問題になっている。すなわち、ハット型断面形状の部品をU字型の曲げ加工用金型を用いて成形する場合には、スプリングバックと呼ばれる形状凍結不良が発生し、寸法精度が得られないことが問題となっている。
また、この形状凍結不良は、最終製品の外観品質を著しく損なうばかりでなく、成形後に行われる組立作業において溶接不良の原因となるため、特にメンバーやフレームなどの構造部品では形状凍結不良の防止が重要視されている。
In recent years, high-strength steel plates and aluminum alloy plates have been frequently used for automobile parts, but shape freezing defects that occur when molding them into automobile parts have become a problem. That is, when a hat-shaped cross-sectional part is formed using a U-shaped bending mold, a shape freezing defect called a spring back occurs, and dimensional accuracy cannot be obtained. Yes.
In addition, this shape freezing defect not only significantly deteriorates the appearance quality of the final product, but also causes welding defects in assembly operations performed after molding, so it is possible to prevent shape freezing defects especially in structural parts such as members and frames. It is important.
曲げ加工で頻繁に観察される形状不良として知られているスプリングバックは、曲げ加工時に金型板に生じた残留応力が除荷時に弾性回復変形するために生ずる現象で、成形下死点での残留応力が板厚方向に不均一に分布することが原因である。一般に、プレス加工により曲げ成形した際に、型から開放すると金属板のスプリングバックにより、パンチの肩部に開きを生じる。
この問題を解決するため、特許文献1には、曲げ肩部に成形方向とは逆方向に凹む凹状段部を同時に成形するプレス成形方法及び成形品が開示されている。これはスプリングバックに対抗する逆モーメントを発生させて釣り合わせ、ポンチ肩付近の角度の開きを防止するものである。
Springback, which is known as a shape defect frequently observed in bending, is a phenomenon that occurs because the residual stress generated in the mold plate during bending is elastically restored and deformed during unloading. This is because the residual stress is unevenly distributed in the thickness direction. In general, when bent from the mold, it is opened at the shoulder of the punch due to the spring back of the metal plate.
In order to solve this problem, Patent Document 1 discloses a press molding method and a molded product for simultaneously molding a concave step portion recessed in a direction opposite to the molding direction on a bending shoulder. This is to counterbalance the spring back and balance it to prevent the angle near the punch shoulder from opening.
しかし、図1に示すように、スプリングバックは肩部1の角度変化だけではなく、材料強度が高くなると、壁部2が平面から曲率を持つ曲面に変形する「壁反り」といわれる現象も顕在化し、特許文献1に開示された発明では壁部の反りを防止することはできない。   However, as shown in FIG. 1, the springback not only changes the angle of the shoulder 1 but also manifests a phenomenon called “wall warpage” in which the wall 2 deforms from a flat surface to a curved surface with curvature as the material strength increases. Therefore, the invention disclosed in Patent Document 1 cannot prevent the wall from warping.
また、自動車部品のような実部品では、形状が非常に複雑になので、二次元的なスプリングバックである「角度変化」と「壁反り」だけでなく、図2、図3に示すような「ねじれ」、「稜線反り」が発生し、プレス成形を行う際に重要な問題となっている。
特開平7−185663号公報
In addition, since an actual part such as an automobile part has a very complicated shape, not only “angular change” and “wall warp” which are two-dimensional springbacks, but also “ “Twist” and “ridge warp” occur, which is an important problem when press forming.
JP 7-185663 A
本発明は、プレス成形部品における形状凍結不良を防止するプレス成形金型を提供することを目的とする。   An object of this invention is to provide the press molding die which prevents the shape freezing defect in a press molded component.
かかる課題を解決するため、本発明の要旨とするところは下記の通りである。
(1) ポンチ、ダイ及びしわ押さえを有する、金属板からハット型成形部品をプレス成形するプレス金型であって、
ポンチが長手方向に3つ以上に分割されており、また分割されたポンチの高さはそれぞれ異なり且つ長手方向の両端部に位置する分割されたポンチが他の分割されたポンチの高さよりも低い構成となっていて、これらの分割されたポンチは成形下死点において高さが一定となる機能を有すると共に、分割されたポンチがさらにストローク方向に分割されており、そのストローク方向の分割箇所に弾性体が配置されていることを特徴とする形状凍結性に優れたプレス金型。
(2) ポンチ、ダイ及びパッドを有する、金属板からハット型成形部品をプレス成形するプレス金型であって、ポンチが長手方向に3つ以上に分割されており、また分割されたポンチの高さはそれぞれ異なり且つ長手方向の両端部に位置する分割されたポンチが他の分割されたポンチの高さよりも低い構成となっていて、これらの分割されたポンチは成形下死点において高さが一定となる機能を有すると共に、分割されたポンチがさらにストローク方向に分割されており、そのストローク方向の分割箇所に弾性体が配置されていることを特徴とする形状凍結性に優れたプレス金型。
(3)弾性体の耐荷重がそれぞれ異なることを特徴とする前記(1)または(2)に記載の形状凍結性に優れたプレス金型。
In order to solve this problem, the gist of the present invention is as follows.
(1) A press mold for press-molding a hat-shaped molded part from a metal plate having a punch, a die and a wrinkle presser,
The punch is divided into three or more in the longitudinal direction, and the heights of the divided punches are different from each other, and the divided punches located at both ends in the longitudinal direction are lower than the heights of the other divided punches. These divided punches have the function of having a constant height at the molding bottom dead center, and the divided punches are further divided in the stroke direction. A press die excellent in shape freezing property, characterized in that an elastic body is arranged.
(2) punch, having a die and a pad, a hat-shaped parts from a metal plate a press die for press-molding, punch is divided into three or more in the longitudinal direction and the divided punch height The divided punches located at both ends in the longitudinal direction are configured to be lower than the heights of the other divided punches, and these divided punches have a height at the bottom dead center. A press die that has a constant function and has excellent shape freezing characteristics, in which the divided punch is further divided in the stroke direction, and an elastic body is arranged at the divided portion in the stroke direction. .
(3) The press mold excellent in shape freezing property as described in (1) or (2) above, wherein the load resistance of the elastic body is different.
本発明により、寸法精度に優れる良好なハット型成形部品を得ることができる。   According to the present invention, a good hat-shaped molded part having excellent dimensional accuracy can be obtained.
以下、本発明を詳細に説明する。
従来から用いられてきたプレス成形用のポンチは、例えば、図4に示す高さ方向(Z方向)に反った形状のように一体構造の金型形状であり、長手方向とストローク方向には分割されていなかった。
Hereinafter, the present invention will be described in detail.
The punches for press molding that have been used in the past are, for example, a die shape having an integral structure such as a shape warped in the height direction (Z direction) shown in FIG. 4, and divided in the longitudinal direction and the stroke direction. Was not.
本発明者らは、図5に示すように、ポンチを長手方向に分割し、必要に応じ分割されたポンチを更にストローク方向にも分割するとともに、ストローク方向の分割個所に弾性体を配置することで、図6に示すように、ポンチに段差を設けることを可能にした。
なお、図6においては、ポンチはストローク方向にも分割されているが、必ずしもストローク方向に分割する必要はなく、長手方向毎に高さの異なるポンチを設け、成形下死点において高さが一定になるようにストローク方向に移動自在な構造としても良い。
また、配置した弾性体の耐荷重をそれぞれ変えることで、スプリングバックをさらに低減できることを知見した。
As shown in FIG. 5, the inventors divide the punch in the longitudinal direction, further divide the divided punch in the stroke direction as necessary, and dispose the elastic body at the divided portions in the stroke direction. Thus, as shown in FIG. 6, it is possible to provide a step in the punch.
In FIG. 6, the punch is also divided in the stroke direction, but it is not always necessary to divide in the stroke direction. Punches having different heights are provided for each longitudinal direction, and the height is constant at the bottom dead center for molding. It is good also as a structure movable in a stroke direction so that it may become.
It was also found that the springback can be further reduced by changing the load resistance of the arranged elastic bodies.
前記(1)に係る発明は、ポンチ、ダイ及びしわ押さえを有するプレス金型であって、ポンチが長手方向に2つ以上に分割されており、また分割されたポンチの高さがそれぞれ異なり、前記分割されたポンチは成形下死点において高さが一定となる機能を有することを特徴とする。
ポンチを長手方向に分割することでポンチの高さを部分的に設定でき、製品とポンチの接触タイミングを自由に設定することを可能にした。それにより、材料の肉あまり(ポンチ底のたるみ)をコントロールし、成形下死点でそれをつぶすことで、ねじれと稜線反りを低減することができる。
The invention according to (1) is a press die having a punch, a die and a wrinkle presser, wherein the punch is divided into two or more in the longitudinal direction, and the heights of the divided punches are different from each other, The divided punch has a function of having a constant height at the bottom dead center of molding.
By dividing the punch in the longitudinal direction, the height of the punch can be set partially, and the contact timing between the product and the punch can be set freely. As a result, it is possible to control twisting and ridge warping by controlling too much of the material (sag at the bottom of the punch) and crushing it at the bottom dead center.
前記(2)に係る発明は、ポンチ、ダイ及びパッドを有するプレス金型であって、ポンチが長手方向に2つ以上に分割されており、また分割されたポンチの高さがそれぞれ異なり、前記分割されたポンチは成形下死点において高さが一定となる機能を有することを特徴とする。
しわ押さえを配置しない構造でもスプリングバックを低減できるのは、しわ押さえを用いない方が材料の肉あまり(ポンチ底のたるみ)を多く発生させることができ、成形下死点でそれをつぶすことで、ねじれと稜線反りを低減することができるからである。
The invention according to (2) is a press die having a punch, a die and a pad, wherein the punch is divided into two or more in the longitudinal direction, and the heights of the divided punches are different from each other, The divided punch has a function of having a constant height at the bottom dead center of molding.
Spring back can be reduced even with a structure that does not have a wrinkle presser. The material that does not use the wrinkle presser can generate a lot of material flesh (punch bottom sagging), and it can be crushed at the bottom dead center of molding. This is because twisting and ridge warping can be reduced.
また、前記(1)及び(2)に係る発明は、分割されたポンチが更にストローク方向に分割されており、分割箇所に弾性体が配置されていることを特徴とする。
図7に示すように分割箇所に弾性体を配置すると、成形下死点でのダイ底との決め押し効果により、ポンチの段差はなくなり(図7(b))、元のポンチ形状と同一の高さになる。ただし、しわ押さえ力と背圧が大きい場合には、成形下死点までポンチの段差を保つことができないので、弾性体の耐荷重はそれ以上にしなければならない。
弾性体として、金属バネ、ウレタン材等を使用することができる。
The inventions according to (1) and (2) are characterized in that the divided punch is further divided in the stroke direction, and an elastic body is arranged at the divided portion.
As shown in FIG. 7, when the elastic body is arranged at the divided portion, the step difference of the punch disappears due to the pressing effect with the die bottom at the bottom dead center (FIG. 7B), which is the same as the original punch shape. Become height. However, when the wrinkle holding force and the back pressure are large, the level difference of the punch cannot be maintained up to the molding bottom dead center, so the load resistance of the elastic body must be more than that.
As an elastic body, a metal spring, a urethane material, etc. can be used.
前記(3)に係る発明は、弾性体の耐荷重がそれぞれ異なることを特徴とする。
弾性体の耐荷重を部分的に変化させることでスプリングバックを低減できるのは、成形下死点でポンチの段差をつぶす耐荷重を変化させることができるので、ポンチ肩の決め押し荷重を増大させることもできるためである。
The invention according to (3) is characterized in that the load resistance of the elastic body is different.
The spring back can be reduced by partially changing the load resistance of the elastic body, because the load resistance to crush the step of the punch at the bottom dead center can be changed, so the pushing load on the punch shoulder is increased. It is because it can also.
なお、本発明の効果は成形品の縦壁角度に影響されるものではなく、縦壁が垂直な場合も、傾斜している場合にも有効である。また、成形に際し、潤滑を施しても本発明の効果を得ることができる。   The effect of the present invention is not influenced by the vertical wall angle of the molded product, and is effective when the vertical wall is vertical or inclined. In addition, the effect of the present invention can be obtained even when lubrication is performed during molding.
本発明例として、板厚1.2mmで、引張り強さ590MPa級の鋼板を用いてハット型プレス成形試験を行った。部品形状は、図8(a)〜(c)に示すように、X−Y平面上で部品の長手方向に湾曲(R330)し(図8(c))、高さ方向(Z方向)には反りのないものである(図8(b)参照)。試験片は幅200mm、長さ500mmとして、ポンチの幅60mm、パンチ肩R5mm、ダイス幅62.4mmの金型であって、図9に示すように、ポンチ2の高さを両サイドのポンチから10mmあるいは20mm高くなるように変え、成形高さ40mmのハット曲げ試験を行った。なお、成形中のしわ押さえ力は200kNあるいはなし(表1では「−」で表記)とした。なお、ポンチ2に配置した弾性体の耐荷重は300kNの金属バネ製とした。
比較例として、実施例1と同一の鋼板及びポンチを分割しない金型を用いて、ハット曲げ試験を行った。
As an example of the present invention, a hat-type press molding test was performed using a steel plate having a thickness of 1.2 mm and a tensile strength of 590 MPa. As shown in FIGS. 8A to 8C, the part shape is curved (R330) in the longitudinal direction of the part on the XY plane (FIG. 8C) and in the height direction (Z direction). Is not warped (see FIG. 8B). The test piece is a mold having a width of 200 mm and a length of 500 mm, a punch width of 60 mm, a punch shoulder R of 5 mm, and a die width of 62.4 mm. As shown in FIG. A hat bending test with a molding height of 40 mm was performed by changing the height to 10 mm or 20 mm. The wrinkle pressing force during molding was 200 kN or none (indicated by “−” in Table 1). The load capacity of the elastic body arranged on the punch 2 was made of a metal spring of 300 kN.
As a comparative example, a hat bending test was performed using the same steel plate as in Example 1 and a mold that does not divide the punch.
曲げ試験を行った試験片は三次元形状測定装置にて天井面の長手方向の形状を測定し、図10に示したように、天井面におけるねじれ角度αで評価した。評価基準は、ねじれ角度が0°以上2°以下のものに◎、2°以上4°以下のものに○、4°以上6°以下に△とした。   The test pieces subjected to the bending test were measured for the shape of the ceiling surface in the longitudinal direction using a three-dimensional shape measuring apparatus, and evaluated by the twist angle α on the ceiling surface as shown in FIG. The evaluation criteria were ◎ for those having a twist angle of 0 ° to 2 °, 以下 for those having a twist angle of 2 ° to 4 °, and △ to 4 ° to 6 °.
本発明例として、板厚1.6mmで、引張り強さ780MPa級の鋼板を用いてハット型プレス成形試験を行った。部品形状は、図11(a)〜(c)に示すように、製品の流入方向に、つまりY−Z平面で長手方向に湾曲(R1000)しており(図11(c))、X−Y平面へ投影した形状は長手方向に真っ直ぐである(図11(b)参照)。試験片は幅160mm、長さ400mmとして、ポンチの幅40mm、パンチ肩R5mm、ダイス幅43.2mmの金型であって、図12に示すように、ポンチ3の高さをポンチから2.5mm,5mm,10mm、ポンチ2の高さを2.5mm,5mm高くなるように変え、成形高さ40mmのハット曲げ試験を行った。なお、ポンチ2,3に配置した弾性体の耐荷重は100kN,200kNの金属バネ製とした。
比較例として、実施例2と同一の鋼板及びポンチを分割しない金型を用いて、ハット曲げ試験を行った。
As an example of the present invention, a hat-type press molding test was performed using a steel plate having a plate thickness of 1.6 mm and a tensile strength of 780 MPa. As shown in FIGS. 11A to 11C, the component shape is curved (R1000) in the product inflow direction, that is, in the longitudinal direction in the YZ plane (FIG. 11C), X- The shape projected onto the Y plane is straight in the longitudinal direction (see FIG. 11B). The test piece is a mold having a width of 160 mm and a length of 400 mm, a punch width of 40 mm, a punch shoulder R of 5 mm, and a die width of 43.2 mm. As shown in FIG. 12, the height of the punch 3 is 2.5 mm from the punch. , 5 mm and 10 mm, and the height of the punch 2 was changed to 2.5 mm and 5 mm higher, and a hat bending test with a molding height of 40 mm was performed. The load capacity of the elastic body arranged on the punches 2 and 3 was made of metal springs of 100 kN and 200 kN.
As a comparative example, a hat bending test was performed using the same steel plate as in Example 2 and a mold that does not divide the punch.
曲げ試験を行った試験片は三次元形状測定装置にて両端の断面形状を測定し、図13に示したように、ポンチ面からの稜線反り角度β(Y−Z平面における長手方向の反り)を評価した。評価基準は、反り角度が0°以上2°以下のものに◎、2°以上4°以下のものを○、4°以上6°以下を△とした。   The test piece subjected to the bending test was measured for the cross-sectional shape at both ends with a three-dimensional shape measuring device, and as shown in FIG. Evaluated. The evaluation criteria were as follows: ◎ when the warp angle was 0 ° or more and 2 ° or less, ○ if 2 ° or more and 4 ° or less, and △ if 4 ° or more and 6 ° or less.
上記実施例1〜2の測定結果を表1〜2に示す。本発明により、部品形状によらず良好な寸法精度に優れるハット型成形部品を得ることができた。   The measurement result of the said Examples 1-2 is shown to Tables 1-2. According to the present invention, it was possible to obtain a hat-shaped molded part having excellent dimensional accuracy regardless of the part shape.
従来のハット曲げ部品を示す断面図である。It is sectional drawing which shows the conventional hat bending component. ハット型成形部品のねじれを示す図である。It is a figure which shows the twist of a hat-shaped molded component. ハット型成形部品の稜線反りを示す図である。It is a figure which shows the ridgeline curvature of a hat-shaped molded component. 従来のポンチ形状を示す図である。It is a figure which shows the conventional punch shape. 本発明に係るポンチ形状を示す図である。It is a figure which shows the punch shape which concerns on this invention. 本発明に係るポンチ形状を示す図である。It is a figure which shows the punch shape which concerns on this invention. 本発明に係るポンチの(a)は成形初期、(b)は成形下死点における状 態を示す断面図である。(A) of the punch according to the present invention is a sectional view showing a state at the initial stage of molding, and (b) is a state at the bottom dead center of molding. 本発明に係るフランジ部及び天井部の稜線が水平に連続的または不連続に 曲がっているハット型成形部品例の(a)は概念図、(b)はX−Z平面における平 面図、(c)はX−Y平面における平面図である。(A) is a conceptual diagram, (b) is a plan view in the XZ plane, and (b) is an example of a hat-shaped molded part in which the ridgelines of the flange portion and the ceiling portion according to the present invention are bent continuously or discontinuously horizontally. c) is a plan view in the XY plane. 本発明の実施例で使用したポンチ形状を説明する図であるIt is a figure explaining the punch shape used in the Example of this invention. ねじれ角度を測定する試験片の両端の断面図である。It is sectional drawing of the both ends of the test piece which measures a twist angle. 本発明に係るフランジ部及び天井部の稜線が垂直方向に連続的または不 連続に曲がっているハット型成形部品例の(a)概念図、(b)X−Z平面における 平面図、(c)Y−Z平面における平面図である。(A) Conceptual diagram of an example of a hat-shaped molded part in which the ridge lines of the flange portion and the ceiling portion according to the present invention are bent continuously or discontinuously in the vertical direction, (b) a plan view in the XZ plane, (c) It is a top view in a YZ plane. 本発明の実施例で使用したポンチ形状を示す図である。It is a figure which shows the punch shape used in the Example of this invention. 稜線反り角度を測定する試験片の側面図である。It is a side view of the test piece which measures a ridgeline curvature angle.
符号の説明Explanation of symbols
1 肩部
2 壁部
1 shoulder
2 walls

Claims (3)

  1. ポンチ、ダイ及びしわ押さえを有する、金属板からハット型成形部品をプレス成形するプレス金型であって、ポンチが長手方向に3つ以上に分割されており、また分割されたポンチの高さはそれぞれ異なり且つ長手方向の両端部に位置する分割されたポンチが他の分割されたポンチの高さよりも低い構成となっていて、これらの分割されたポンチは成形下死点において高さが一定となる機能を有すると共に、分割されたポンチがさらにストローク方向に分割されており、そのストローク方向の分割箇所に弾性体が配置されていることを特徴とする形状凍結性に優れたプレス金型。 A press die for press-molding a hat-shaped molded part from a metal plate having a punch, a die, and a wrinkle presser, wherein the punch is divided into three or more in the longitudinal direction, and the height of the divided punch is The divided punches which are different from each other and located at both ends in the longitudinal direction are configured to be lower than the heights of the other divided punches, and these divided punches have a constant height at the bottom dead center. A press die excellent in shape freezing property, characterized in that the divided punch is further divided in the stroke direction, and an elastic body is arranged at the divided portion in the stroke direction.
  2. ポンチ、ダイ及びパッドを有する、金属板からハット型成形部品をプレス成形するプレス金型であって、ポンチが長手方向に3つ以上に分割されており、また分割されたポンチの高さはそれぞれ異なり且つ長手方向の両端部に位置する分割されたポンチが他の分割されたポンチの高さよりも低い構成となっていて、これらの分割されたポンチは成形下死点において高さが一定となる機能を有すると共に、分割されたポンチがさらにストローク方向に分割されており、そのストローク方向の分割箇所に弾性体が配置されていることを特徴とする形状凍結性に優れたプレス金型。 Punch, having a die and a pad, a hat-shaped parts from a metal plate a press die for press-molding, punch is divided into three or more in the longitudinal direction and the height of the divided punch are each The divided punches that are different and located at both ends in the longitudinal direction are configured to be lower in height than the other divided punches, and these divided punches have a constant height at the bottom dead center. A press die that has a function and has a shape freezing property, wherein the divided punch is further divided in a stroke direction, and an elastic body is arranged at a divided portion in the stroke direction.
  3. 弾性体の耐荷重がそれぞれ異なることを特徴とする請求項1または請求項2に記載の形状凍結性に優れたプレス金型。   The press die having excellent shape freezing property according to claim 1 or 2, wherein the load resistance of the elastic body is different.
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JP4621185B2 (en) * 2006-09-19 2011-01-26 新日本製鐵株式会社 Design method of two-stage press mold with excellent shape freezing
JP4879812B2 (en) * 2007-04-24 2012-02-22 新日本製鐵株式会社 Press molding method with excellent shape freezing
JP4907590B2 (en) * 2008-04-01 2012-03-28 新日本製鐵株式会社 Metal cross-section hat-shaped member having a bent portion outside the plane in the longitudinal direction of the member, and press forming method thereof
JP5281519B2 (en) * 2009-08-26 2013-09-04 トヨタ自動車株式会社 Press forming method
US9731339B2 (en) 2013-01-07 2017-08-15 Nippon Steel & Sumitomo Metal Corporation Method for producing press-molded article
JP6159108B2 (en) * 2013-03-18 2017-07-05 株式会社Subaru Bending mold
US10226807B2 (en) 2014-02-24 2019-03-12 Jfe Steel Corporation Press forming method and method of manufacturing pressed product as well as press forming apparatus
DE102014226519A1 (en) * 2014-12-19 2016-06-23 Sms Group Gmbh Press tool part and device for eliminating flatness errors on flat semi-finished products
JP6515961B2 (en) * 2017-08-02 2019-05-22 Jfeスチール株式会社 Method of manufacturing press-formed product

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