JP4002464B2 - Thin plate pressing method and apparatus using tension control - Google Patents
Thin plate pressing method and apparatus using tension control Download PDFInfo
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- JP4002464B2 JP4002464B2 JP2002118975A JP2002118975A JP4002464B2 JP 4002464 B2 JP4002464 B2 JP 4002464B2 JP 2002118975 A JP2002118975 A JP 2002118975A JP 2002118975 A JP2002118975 A JP 2002118975A JP 4002464 B2 JP4002464 B2 JP 4002464B2
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Description
【０００１】
【発明の属する技術分野】
本発明は自動車用部品、家電製品用部品、容器等を、鋼板、アルミ板等の薄板材を用いてプレス加工することにより製造する方法及び装置に関し、加工中にシワ押さえ圧力を制御するプレス加工方法及びプレス装置に係るものである。
【０００２】
【従来の技術】
薄板のプレス加工においてシワ押さえ圧力（ＢＨＦ）が高すぎる場合は、材料に過大な張力がかかり「割れ」が発生し、低すぎる場合には材料の張力が不足し「シワ」が発生する。しかし材料の特性のバラツキにより、プレス加工に対するシワ押さえ圧力の適正範囲は変動する問題があり、シワ押さえ圧力を適正範囲に収める必要がある。最近、安全対策、環境対策として自動車への高強度鋼板適用が拡大しているが、一般に高強度鋼板の場合、シワ押さえ圧力の適正範囲は狭くなる傾向があり、プレス加工を難しくしている。
【０００３】
シワ押さえ圧力（荷重）の制御に関し、特開平７−２６６１００号公報には、予め素材の物理量と適正シワ押さえ荷重との関係を求めておき、実際の物理量に応じて適正シワ押さえ荷重を求め、プレス加工時にシワ押さえ荷重を制御する方法が開示されている。
【０００４】
【発明が解決しようとする課題】
しかし、特開平７−２６６１００号公報に開示された発明は、シワ抑え荷重が目標値である一定値となるように制御する方法であり、加工中にシワ押さえ荷重を制御する技術は開示されていない。
本発明は薄板のプレス加工において「割れ」「シワ」の発生がシワ押さえにおける材料の張力と密接な関係があることから、加工中に発生する「割れ」、「シワ」を防止する方法及び装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
係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）プレス加工中において材料にかかる垂直方向の荷重Ｗ［ＭＰａ］を測定し、（１）式に基づいて材料にかかる張力を算出し、張力が所定範囲内となるようにシワ押さえ圧力を制御することを特徴とするプレス加工方法。
Ｗ＝Ｔ×（ｓｉｎθ１＋ｓｉｎθ２） （１）
但し、材料が水平となす角度をそれぞれθ１［度］、θ２［度］とする。
（２）予め材料にかかる張力の目標値を定め、前記目標値の±９％以内となるようにシワ押さえ圧力を制御することを特徴とする前記（１）記載のプレス加工方法。
（３）ポンチ、ダイス及びシワ押さえと、更にプレス加工中の材料にかかる垂直方向の荷重Ｗ［ＭＰａ］を測定し、（１）式に基づいて材料にかかる張力を算出する張力測定手段と、前記張力測定手段で測定した張力に基づいて前記シワ押さえのシワ押さえ圧力を調整する制御手段を有することを特徴とするプレス加工装置。
Ｗ＝Ｔ×（ｓｉｎθ１＋ｓｉｎθ２） （１）
但し、材料が水平となす角度をそれぞれθ１［度］、θ２［度］とする。
（４）張力測定手段がダイス中に設置されていることを特徴とする前記（３）記載のプレス装置。
【０００６】
【発明の実施の形態】
以下、本発明について詳細に説明する。
図１はプレス加工前、図２はプレス加工後の例を示している。まず、ダイス２上の材料４に対して、シワ押さえ３が上から圧力をかける。次に、プレス加工においてポンチ１が上から移動して材料４をプレスする。この際、ポンチ１とダイス２の間の材料４には、シワ押さえの圧力により張力が発生している。
【０００７】
図３は前記（３）、（４）に係る本発明の装置構成の例を示している。ダイス２に張力測定装置５が設置されており、プレス加工に際して材料にかかる張力を直接測定する。図４は本発明の装置構成例の詳細を示している。ダイス２内に設置された張力測定装置５は、材料４に接触して材料４にかかる張力を測定している。
【０００８】
図５は材料にかかる張力を測定する仕組みの概念を２次元で示している。材料にかかる張力をＴ［ＭＰａ］とし、張力測定装置５のダイス２側およびポンチ１側で材料が水平となす角度をそれぞれθ１［度］、θ２［度］とすれば、張力測定装置５が垂直方向に受ける荷重Ｗ［ＭＰａ］は以下の（１）式で表すことができる。
Ｗ＝Ｔ×（ｓｉｎθ１＋ｓｉｎθ２） （１）
θ１、θ２はポンチ１、ダイス２、シワ押さえ３の幾何形状と位置、および材料の板厚で決まるので、張力測定装置５が垂直方向に受ける荷重Ｗを測定することにより、材料にかかる張力Ｔを算出することができる。前記（１）に係る発明では、上記に説明したようにプレス加工中において材料にかかる張力を測定し、張力が所定範囲内となるようにシワ押さえ圧力を制御する。
【０００９】
図６は材料にかかる張力とシワ押さえ圧力の関係の例であり、シワ押さえ圧力を操作することにより、材料にかかる張力を適正範囲に制御できることを示している。プレス加工中に材料に係る張力が所定値以下になると、シワが発生し、所定値を超えると、われが発生しやすくなる。
【００１０】
前記（２）に係る発明では、予め材料にかかる張力の目標値を定め、前記目標値の±９％以内となるようにシワ押さえ圧力を制御する。
張力の目標値は事前に実施するテストプレスにより定める。すなわち、シワ押さえ圧を変化させてテストプレスを繰り返し、割れもシワも発生しない最適なプレスが行えた際の張力測定装置５による測定値を目標値とする。プレス加工中に測定した張力が。目標値−９％より小さいとシワが発生し、目標値＋９％より大きいとわれが発生するので、目標値±９％以内となるようにシワ押さえ圧力を制御することが好ましい。
【００１１】
【実施例】
以下、実施例について説明する。
材料として、直径２００ｍｍ、厚さ１．０ｍｍの３５０ＭＰａ級冷延鋼板を用いた。金型は円筒深絞り用でパンチは径１００ｍｍ、肩Ｒ８ｍｍ、ダイスは径１０２．６ｍｍ、肩Ｒ８ｍｍを用いた。本発明例として、図３に示すようにダイス２内に荷重測定装置５としてロードセルを設置してプレス加工中の張力を測定した。プレス加工に先立ちテストプレスを実施した結果、シワと割れが発生しない場合の張力測定値から、張力の目標値は２７５［ＭＰａ／ｍｍ］とした。
【００１２】
本発明例ではプレス加工中に張力を測定し、張力の測定値が目標値の±９％以内となるようにシワ押さえ圧力を制御した。その結果、３０回のプレス加工においてシワ、割れの発生は皆無であった。一方、比較例ではプレス加工中の張力測定を行わずに、シワ押さえ圧力を９［Ｔｏｎ］一定として加工したところ、３０回のプレス加工において、シワ１件、割れ６件が発生した。
【００１３】
【発明の効果】
本発明により、プレス加工において加工中に発生する「割れ」、「シワ」を防止することができる。
【図面の簡単な説明】
【図１】プレス加工前の装置構成例を示す。
【図２】プレス加工後の装置構成例を示す。
【図３】本発明の装置構成例の概要を示す。
【図４】本発明の装置構成例の詳細を示す。
【図５】材料にかかる張力の測定の仕組みを示す。
【図６】材料にかかる張力とシワ押さえ圧力の関係の例を示す図である。
【符号の説明】
１ ポンチ
２ ダイス
３ シワ押さえ
４ 材料
５ 荷重測定装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing automotive parts, parts for home appliances, containers, and the like by using a thin plate material such as a steel plate and an aluminum plate, and press processing for controlling the wrinkle pressing pressure during the processing. The present invention relates to a method and a press apparatus.
[0002]
[Prior art]
When the pressing pressure (BHF) is too high in the press working of a thin plate, excessive tension is applied to the material to cause “cracking”, and when it is too low, the tension of the material is insufficient and “wrinkle” is generated. However, there is a problem that the appropriate range of the wrinkle pressing pressure with respect to press working varies due to variations in material characteristics, and it is necessary to keep the wrinkle pressing pressure within the appropriate range. Recently, the application of high-strength steel sheets to automobiles has expanded as a safety measure and environmental measure. However, in the case of high-strength steel sheets, the proper range of wrinkle pressure tends to be narrow, making pressing difficult.
[0003]
Regarding the control of wrinkle holding pressure (load), Japanese Patent Laid-Open No. 7-266100 discloses a relationship between a physical quantity of a material and an appropriate wrinkle holding load in advance, and obtains an appropriate wrinkle holding load according to an actual physical quantity, A method for controlling the wrinkle holding load during press working is disclosed.
[0004]
[Problems to be solved by the invention]
However, the invention disclosed in Japanese Patent Application Laid-Open No. 7-266100 is a method for controlling the wrinkle restraining load to be a constant value that is a target value, and a technique for controlling the wrinkle restraining load during processing is disclosed. Absent.
The present invention relates to a method and an apparatus for preventing “cracking” and “wrinkle” that occur during processing because the occurrence of “cracking” and “wrinkle” is closely related to the tension of the material in the wrinkle presser in the press working of a thin plate. The purpose is to provide.
[0005]
[Means for Solving the Problems]
In order to solve the problem, the gist of the present invention is as follows.
(1) The vertical load W [MPa] applied to the material during press working is measured , the tension applied to the material is calculated based on the equation (1) , and the wrinkle holding pressure is set so that the tension is within a predetermined range. A press working method characterized by controlling.
W = T × (sin θ1 + sin θ2) (1)
However, the angles between the material and the horizontal are θ1 [degree] and θ2 [degree], respectively.
(2) The press working method according to (1), wherein a target value of tension applied to the material is determined in advance, and the wrinkle pressing pressure is controlled to be within ± 9% of the target value.
(3) a punch, die and wrinkle presser, and further, a tension measuring means for measuring a vertical load W [MPa] applied to the material being pressed, and calculating a tension applied to the material based on the equation (1) ; A press working apparatus comprising a control means for adjusting a wrinkle pressing pressure of the wrinkle press based on a tension measured by the tension measuring means.
W = T × (sin θ1 + sin θ2) (1)
However, the angles between the material and the horizontal are θ1 [degree] and θ2 [degree], respectively.
(4) The press device according to (3), wherein the tension measuring means is installed in the die.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
FIG. 1 shows an example before pressing, and FIG. 2 shows an example after pressing. First, the
[0007]
FIG. 3 shows an example of the apparatus configuration of the present invention according to the above (3) and (4). A
[0008]
FIG. 5 shows the concept of the mechanism for measuring the tension applied to the material in two dimensions. If the tension applied to the material is T [MPa] and the angles of the material to be horizontal on the
W = T × (sin θ1 + sin θ2) (1)
Since θ1 and θ2 are determined by the geometric shape and position of the punch 1, the
[0009]
FIG. 6 shows an example of the relationship between the tension applied to the material and the wrinkle pressing pressure, and shows that the tension applied to the material can be controlled within an appropriate range by operating the wrinkle pressing pressure. When the tension applied to the material is lower than a predetermined value during the press working, wrinkles are generated. When the tension exceeds the predetermined value, cracks are likely to occur.
[0010]
In the invention according to (2), the target value of the tension applied to the material is determined in advance, and the wrinkle holding pressure is controlled to be within ± 9% of the target value.
The target value of tension is determined by a test press that is performed in advance. That is, the test press is repeated while changing the wrinkle pressing pressure, and the measured value by the
[0011]
【Example】
Examples will be described below.
As a material, a 350 MPa class cold-rolled steel sheet having a diameter of 200 mm and a thickness of 1.0 mm was used. The mold was for deep cylindrical drawing, the punch was 100 mm in diameter and shoulder R8 mm, and the die was 102.6 mm in diameter and shoulder R8 mm. As the present invention example was measured tension during press working by installing the load cell as a
[0012]
In the example of the present invention, the tension was measured during press working, and the wrinkle pressure was controlled so that the measured value of the tension was within ± 9% of the target value. As a result, wrinkles and cracks were not generated in 30 times of press working. On the other hand, in the comparative example, without measuring the tension during the press working, the wrinkle pressing pressure was fixed at 9 [Ton]. As a result, 1 wrinkle and 6 cracks occurred in 30 press workings.
[0013]
【The invention's effect】
According to the present invention, it is possible to prevent “cracking” and “wrinkle” that occur during press working.
[Brief description of the drawings]
FIG. 1 shows an example of a device configuration before press working.
FIG. 2 shows an example of an apparatus configuration after press working.
FIG. 3 shows an outline of an apparatus configuration example of the present invention.
FIG. 4 shows details of an apparatus configuration example of the present invention.
FIG. 5 shows a mechanism for measuring tension applied to a material.
FIG. 6 is a diagram illustrating an example of a relationship between a tension applied to a material and a wrinkle pressing pressure.
[Explanation of symbols]
1
Claims (4)
Ｗ＝Ｔ×（ｓｉｎθ１＋ｓｉｎθ２） （１）
但し、材料が水平となす角度をそれぞれθ１［度］、θ２［度］とする。 Measure the vertical load W [MPa] applied to the material during press processing, calculate the tension applied to the material based on the formula (1) , and control the wrinkle holding pressure so that the tension is within a predetermined range. A press working method characterized by the above.
W = T × (sin θ1 + sin θ2) (1)
However, the angles between the material and the horizontal are θ1 [degree] and θ2 [degree], respectively.
Ｗ＝Ｔ×（ｓｉｎθ１＋ｓｉｎθ２） （１）
但し、材料が水平となす角度をそれぞれθ１［度］、θ２［度］とする。 Tension measurement means for measuring the vertical load W [MPa] applied to the material being pressed, punching, dice and wrinkle pressing, and calculating the tension applied to the material based on the formula (1), and the tension measurement A press working apparatus comprising a control means for adjusting a wrinkle pressing pressure of the wrinkle press based on a tension measured by the means.
W = T × (sin θ1 + sin θ2) (1)
However, the angles between the material and the horizontal are θ1 [degree] and θ2 [degree], respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002118975A JP4002464B2 (en) | 2002-04-22 | 2002-04-22 | Thin plate pressing method and apparatus using tension control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002118975A JP4002464B2 (en) | 2002-04-22 | 2002-04-22 | Thin plate pressing method and apparatus using tension control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003311340A JP2003311340A (en) | 2003-11-05 |
| JP4002464B2 true JP4002464B2 (en) | 2007-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002118975A Expired - Fee Related JP4002464B2 (en) | 2002-04-22 | 2002-04-22 | Thin plate pressing method and apparatus using tension control |
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| Country | Link |
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| JP (1) | JP4002464B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5210069B2 (en) * | 2008-07-23 | 2013-06-12 | 本田技研工業株式会社 | Molding condition determination method |
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| JP2003311340A (en) | 2003-11-05 |
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