WO2013030916A1 - ホットプレス用金型 - Google Patents
ホットプレス用金型 Download PDFInfo
- Publication number
- WO2013030916A1 WO2013030916A1 PCT/JP2011/069431 JP2011069431W WO2013030916A1 WO 2013030916 A1 WO2013030916 A1 WO 2013030916A1 JP 2011069431 W JP2011069431 W JP 2011069431W WO 2013030916 A1 WO2013030916 A1 WO 2013030916A1
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- WIPO (PCT)
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- mold
- workpiece
- memory alloy
- shape memory
- work
- Prior art date
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Classifications
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- 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
- B21D37/16—Heating or cooling
Definitions
- the present invention relates to a mold structure used for hot press molding in which a heated workpiece is cooled at the same time as being pressed.
- a workpiece such as a steel plate heated to a temperature above which the austenite structure appears is subjected to press processing by a press device to which a die composed of an upper die and a lower die is attached, and at the same time, contact between the die and the workpiece.
- Hot press molding that performs a quenching process using cooling by the above is widely known (see, for example, Patent Document 1).
- the present invention provides a hot press die that can suppress the occurrence of a gap between the die and the workpiece and can realize uniform contact between the die and the workpiece.
- the hot press mold of the present invention includes a fixed mold and a movable mold that are arranged so that their molding surfaces face each other.
- press working is performed.
- a mold for hot pressing that cools the workpiece by holding the molding surface of the fixed mold and the movable mold in contact with the surface of the workpiece, and among the molding surfaces of the stationary mold, A layer made of a shape memory alloy is formed at least at a site where the hit is strong during the press working.
- the product shape of the workpiece has a hat-shaped cross section in the longitudinal direction, and the shape of the fixed mold on the surface corresponding to the flange surface and the top surface of the hat-shaped cross section of the product shape of the workpiece.
- a memory alloy layer is preferably formed.
- the shape memory alloy layer formed on the molding surface of the fixed mold is preferably composed of a superelastic alloy.
- the hot press die of the present invention it is possible to suppress the occurrence of a gap between the die and the workpiece, and to realize uniform contact between the die and the workpiece.
- the mold 1 is a hot press mold for producing a product by subjecting the work 2 to hot press molding.
- the mold 1 includes a lower mold 10 and an upper mold 20, and the work 2 is sandwiched and pressed between them to form the work 2 into a predetermined product shape.
- the workpiece 2 is a steel plate and is put into the mold 1 in a state of being heated to a temperature higher than the temperature at which the austenite structure appears.
- the workpiece 2 is molded into a product shape in the mold 1 and held for a certain period of time while being sandwiched between the lower mold 10 and the upper mold 20, thereby being quenched and quenched.
- the workpiece 2 is formed into a product shape having a hat-shaped cross section in the longitudinal direction. That is, the product shape of the workpiece 2 has a flange surface and a top surface formed as surfaces orthogonal to the pressing direction in the mold 1 and has a wall surface connecting these flange surfaces and the top surface.
- the wall surface in this product shape is formed as a surface substantially parallel to the pressing direction of the mold 1.
- the flange surface and the top surface are not limited to those that are strictly perpendicular to the pressing direction, and may have a certain degree of inclination (for example, a surface having an inclination with respect to the pressing direction of 30 degrees or less).
- the product which has a top surface should just be a range generally used as what has a hat-shaped cross section.
- the lower mold 10 is configured as a fixed mold and is fixed to a floor surface or the like.
- the lower mold 10 is formed with a convex portion that protrudes with respect to the upper mold 20, and the lower mold 10 is configured as a convex mold facing upward.
- the upper mold 20 is configured as a movable mold.
- the upper mold 20 is supported by an appropriate press device and is movable with respect to the lower mold 10.
- the upper mold 20 is formed with a concave portion corresponding to the convex portion of the lower mold 10, and the upper mold 20 is configured as a concave mold.
- the mutually opposing surfaces of the lower mold 10 and the upper mold 20 are formed as molding surfaces, and the workpiece 2 is molded according to the shape of the molding surface.
- the lower mold 10 and the upper mold 20 have a molding surface corresponding to the product shape of the workpiece 2 and are arranged so that the molding surfaces face each other.
- a shape memory alloy layer 30 is formed over the entire molding surface of the lower mold 10.
- the shape memory alloy layer 30 is an alloy layer formed integrally with the lower die 10 by welding the shape memory alloy to the surface of the lower die 10 by laser welding or the like.
- the shape memory alloy layer 30 is formed with a thickness that does not affect the moldability of the mold 1.
- the shape memory alloy constituting the shape memory alloy layer 30 a commonly used alloy such as a Ni—Ti alloy or an iron-based shape memory alloy can be used.
- the shape memory alloy constituting the shape memory alloy layer 30 needs to reach the transformation point and exhibit superelastic characteristics at least when the workpiece 2 is hot pressed by the mold 1.
- it is a superelastic alloy in which the normal temperature (about 20 ° C.) or lower is set as the shape recovery temperature.
- press work of the work 2 is started by moving the upper mold 20 with respect to the lower mold 10 with the work 2 set. And the upper mold
- the shape memory alloy layer 30 formed on the molding surface of the lower mold 10 can be superelastically deformed by heat transfer from the workpiece 2 or by setting its shape recovery temperature. For this reason, in a portion where the upper die 20 is strongly hit (a portion corresponding to a surface orthogonal to the pressing direction, such as a flange surface or a top surface in the product), superelastic deformation is performed according to the pressing force received from the upper die 20 and the workpiece 2 To do.
- the shape memory alloy layer 30 is superelastically deformed and strokes at a strong hit portion, and further flows from a strong hit portion toward a weak portion, thereby increasing the thickness of the weak hit portion and applying a press load. it can.
- the gap between the workpiece 2 and the lower mold 10 can be absorbed by the superelastic deformation of the shape memory alloy layer 30. Furthermore, when the molding surface of the lower mold 10 is deformed by the shape memory alloy layer 30, the manner in which the lower mold 10 and the work 2 are brought into contact changes, and the contact between the work 2 and the upper mold 20 is also improved. Thereby, it is difficult for a gap to be generated between the workpiece 2 and the upper mold 20. That is, by providing the shape memory alloy layer 30 on the molding surface of the lower mold 10, it is possible to suppress the generation of a gap between the mold 1 and the work 2.
- the product shape of the workpiece 2 has a hat-shaped cross section as in the present embodiment, it is known that wrinkles are likely to occur at a portion where the bending amount is large (such as a corner portion), a shrinkage flange, or the like. Even when wrinkles occur in this way, the shape memory alloy layer 30 is superelastically deformed, so that a part of the molding surface of the lower mold 10 enters the wrinkles, so that the workpiece 2 and the mold 1 are evenly contacted. Can be realized. Moreover, since the contact with the wall surface part contained in the product shape of the workpiece 2 can be increased, the time required for cooling the workpiece 2 can be shortened. Therefore, when hot pressing the workpiece 2 using the mold 1, the cycle time can be shortened while ensuring the quality.
- the press load by the upper mold 20 is released.
- the shape memory alloy layer 30 returns to its original shape due to the superelastic characteristics.
- the shape memory alloy layer 30 provided on the lower mold 10 may be partially disposed instead of being disposed on the entire molding surface of the lower mold 10. Specifically, the shape memory alloy layer 30 is disposed at a portion corresponding to the flange surface and top surface of the product shape of the workpiece 2, which is a portion where the upper die 20 is strongly hit on the molding surface of the lower die 10. As a result, the shape memory alloy layer 30 is superelastically deformed at a portion where the upper die 20 is strongly hit, and the upper die 20 is stroked, and the hit against the wall portion which is a weakly hit portion becomes stronger. That is, the contact with the workpiece 2 in the mold 1 can be made uniform. As described above, by disposing the shape memory alloy layer 30 at least on the molding surface of the lower mold 10 (part orthogonal to the pressing direction), the contact between the mold 1 and the workpiece 2 can be improved.
- the shape memory alloy layer 30 may be formed on the molding surface of the upper mold 20 in addition to the molding surface of the lower mold 10. By providing the shape memory alloy layer 30 on the molding surface of the upper mold 20, the contact between the mold 1 and the workpiece 2 can be further improved.
- the present invention can be used for a mold used for hot press molding in which a heated workpiece is cooled at the same time as being pressed.
- Mold (hot press mold) 2 Workpiece 10: Lower mold 20: Upper mold 30: Shape memory alloy layer
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
そこで、本発明は、金型とワークの間に隙間が発生することを抑制し、金型とワークの均一な接触を実現できるホットプレス用金型を提供する。
ワーク2は、鋼板であり、オーステナイト組織が現れる温度以上に加熱された状態で金型1に投入される。ワーク2は、金型1内で製品形状に成形されるとともに、下型10と上型20で挟み込まれた状態で一定時間保持されることにより、急冷されて焼き入れされる。
なお、フランジ面及び頂面はプレス方向に対して厳密に直交するものに限らず、ある程度の傾きを有するもの(例えば、プレス方向に対する傾きが30度以下の面)でも良く、そのようなフランジ面及び頂面を有する製品が一般的にハット型断面を有するものとして用いられる範囲であれば良い。
上型20は、可動型として構成される。上型20は、適宜のプレス装置に支持され、下型10に対して移動可能である。上型20には、下型10の凸部に対応した凹部が形成されており、上型20は凹型として構成される。
下型10及び上型20の互いに対向する表面は、成形面として形成され、その成形面の形状に応じてワーク2が成形される。言い換えれば、下型10及び上型20は、ワーク2の製品形状に応じた成形面を有し、互いの成形面が対向するように配置される。
形状記憶合金層30は、形状記憶合金を下型10の表面にレーザ溶接等によって溶接することによって、下型10と一体的に形成される合金層である。形状記憶合金層30は、金型1の成形性に影響を及ぼさない範囲の厚みで形成される。
ここで、形状記憶合金層30を構成する形状記憶合金の性質として、金型1を型締めした状態でワーク2からの熱伝達によって容易に(例えば数秒後に)形状回復温度に到達し得る組成を有することが好ましく、さらには、常温(20℃程度)以下が形状回復温度として設定される超弾性合金であることが好ましい。
このとき、下型10の成形面に形成されている形状記憶合金層30は、ワーク2からの熱伝達により、又は、その形状回復温度の設定により、超弾性変形可能となる。このため、上型20の当たりが強い部位(製品におけるフランジ面、頂面等、プレス方向に直交する面に対応する部位)では、上型20及びワーク2から受けるプレス力に応じて超弾性変形する。当たりが強い部位では形状記憶合金層30が超弾性変形してストロークし、さらに当たりが強い部位から弱い部位に向かって流動することによって、当たりが弱い部位の厚みを増やしてプレス荷重を掛けることができる。
特に、本実施形態のようにワーク2の製品形状がハット型断面を有する場合は、曲げ量が大きい部位(コーナー部等)、縮みフランジ等にしわが発生し易いことが知られている。このようにしわが発生した場合でも形状記憶合金層30が超弾性変形することにより、下型10の成形面の一部がしわの内部に入り込むことによって、ワーク2と金型1との均一な接触を実現できる。また、ワーク2の製品形状に含まれる壁面部分への当たりを強くできるため、ワーク2の冷却に要する時間を短縮できる。従って、金型1を用いてワーク2をホットプレス加工する際に、品質を確保しつつ、サイクルタイムを短くできる。
このように、下型10の成形面において、少なくとも当たりが強い部位(プレス方向と直交する部位)に形状記憶合金層30を配置することによって、金型1とワーク2との接触を改善できる。
Claims (3)
- 互いの成形面が対向するように配置される固定型及び可動型を具備し、加熱されたワークを前記固定型及び可動型によって挟み込んでプレス加工を行うと同時に、前記ワークの表面に前記固定型及び可動型の成形面を接触させた状態で保持することで、前記ワークを冷却するホットプレス用金型であって、
前記固定型の成形面のうち、少なくとも前記プレス加工時に当たりが強くなる部位に形状記憶合金によって構成される層が形成されるホットプレス用金型。 - 前記ワークの製品形状は、長手方向にハット型断面を有するものであり、
前記固定型の成形面において、前記ワークの製品形状におけるハット型断面のフランジ面及び頂面に対応する部位に、前記形状記憶合金層が形成される請求項1に記載のホットプレス用金型。 - 前記固定型の成形面に形成される形状記憶合金層は、超弾性合金によって構成される請求項1又は2に記載のホットプレス用金型。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180073039.0A CN103764311A (zh) | 2011-08-29 | 2011-08-29 | 热压用模具 |
DE112011105567.6T DE112011105567T5 (de) | 2011-08-29 | 2011-08-29 | Metallform zum Heißpressen |
PCT/JP2011/069431 WO2013030916A1 (ja) | 2011-08-29 | 2011-08-29 | ホットプレス用金型 |
JP2013530900A JP5807681B2 (ja) | 2011-08-29 | 2011-08-29 | ホットプレス用金型 |
US14/234,867 US20140190233A1 (en) | 2011-08-29 | 2011-08-29 | Metal mold for hot pressing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2011/069431 WO2013030916A1 (ja) | 2011-08-29 | 2011-08-29 | ホットプレス用金型 |
Publications (1)
Publication Number | Publication Date |
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WO2013030916A1 true WO2013030916A1 (ja) | 2013-03-07 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2011/069431 WO2013030916A1 (ja) | 2011-08-29 | 2011-08-29 | ホットプレス用金型 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140190233A1 (ja) |
JP (1) | JP5807681B2 (ja) |
CN (1) | CN103764311A (ja) |
DE (1) | DE112011105567T5 (ja) |
WO (1) | WO2013030916A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5644942B2 (ja) * | 2011-05-16 | 2014-12-24 | トヨタ自動車株式会社 | ホットプレス用金型、及びホットプレス用金型の製造方法 |
WO2016074798A1 (fr) * | 2014-11-05 | 2016-05-19 | Bobst Mex Sa | Procede de realisation d'un outil de gaufrage femelle, outil de gaufrage femelle, et module de gaufrage ainsi equipe |
US10590615B2 (en) * | 2016-06-28 | 2020-03-17 | Vigor Industrial Llc | Orthotropic deck |
CN106825250B (zh) * | 2017-04-01 | 2018-12-11 | 京东方科技集团股份有限公司 | 一种模具 |
CN109664470A (zh) * | 2018-12-27 | 2019-04-23 | 佛山市顺德区震旭塑料机械有限公司 | 一种具有温控模槽变形功能的注塑机模具 |
CN109590449A (zh) * | 2019-01-14 | 2019-04-09 | 河南工业职业技术学院 | 一种压铸模具设计的浇注结构及其方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5831111U (ja) * | 1981-08-26 | 1983-03-01 | シャープ株式会社 | 成形金型 |
JPS59225824A (ja) * | 1983-06-06 | 1984-12-18 | Nippon Light Metal Co Ltd | 形状記憶合金を用いた曲げ加工方法 |
JPH0847732A (ja) * | 1994-08-05 | 1996-02-20 | Murakami Shokai:Kk | プレス型およびその製造方法 |
Family Cites Families (9)
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JPS56126977A (en) * | 1980-03-11 | 1981-10-05 | Nec Corp | Junction type field effect transistor |
DE19925420A1 (de) * | 1999-06-02 | 2000-12-07 | Voith Sulzer Papiertech Patent | Elastische Walze und Verfahren zum Herstellen einer solchen |
JP2005191082A (ja) * | 2003-12-24 | 2005-07-14 | Toyota Motor Corp | 電気機器の冷却装置 |
US7188498B2 (en) * | 2004-12-23 | 2007-03-13 | Gm Global Technology Operations, Inc. | Reconfigurable tools and/or dies, reconfigurable inserts for tools and/or dies, and methods of use |
CN101258774A (zh) * | 2005-01-19 | 2008-09-03 | 通用汽车公司 | 形状可调夹紧装置及其用法 |
CN1326686C (zh) * | 2005-07-20 | 2007-07-18 | 哈尔滨工业大学 | 主动变形混合复合材料的制备方法 |
US20070287010A1 (en) * | 2006-06-07 | 2007-12-13 | General Atomics | Composite structures with integral intelligent skin |
JP2008012540A (ja) * | 2006-07-03 | 2008-01-24 | Mitsubishi Materials Corp | ホットプレス |
DE102008034996B4 (de) * | 2008-07-25 | 2010-11-18 | Benteler Automobiltechnik Gmbh | Vorrichtung zum Warmformen, Presshärten und Schneiden eines Halbzeugs aus härtbarem Stahl |
-
2011
- 2011-08-29 WO PCT/JP2011/069431 patent/WO2013030916A1/ja active Application Filing
- 2011-08-29 CN CN201180073039.0A patent/CN103764311A/zh active Pending
- 2011-08-29 DE DE112011105567.6T patent/DE112011105567T5/de not_active Ceased
- 2011-08-29 US US14/234,867 patent/US20140190233A1/en not_active Abandoned
- 2011-08-29 JP JP2013530900A patent/JP5807681B2/ja not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5831111U (ja) * | 1981-08-26 | 1983-03-01 | シャープ株式会社 | 成形金型 |
JPS59225824A (ja) * | 1983-06-06 | 1984-12-18 | Nippon Light Metal Co Ltd | 形状記憶合金を用いた曲げ加工方法 |
JPH0847732A (ja) * | 1994-08-05 | 1996-02-20 | Murakami Shokai:Kk | プレス型およびその製造方法 |
Also Published As
Publication number | Publication date |
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JP5807681B2 (ja) | 2015-11-10 |
DE112011105567T5 (de) | 2014-05-08 |
US20140190233A1 (en) | 2014-07-10 |
JPWO2013030916A1 (ja) | 2015-03-23 |
CN103764311A (zh) | 2014-04-30 |
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