JP2857497B2 - Press mold - Google Patents
Press moldInfo
- Publication number
- JP2857497B2 JP2857497B2 JP41515490A JP41515490A JP2857497B2 JP 2857497 B2 JP2857497 B2 JP 2857497B2 JP 41515490 A JP41515490 A JP 41515490A JP 41515490 A JP41515490 A JP 41515490A JP 2857497 B2 JP2857497 B2 JP 2857497B2
- Authority
- JP
- Japan
- Prior art keywords
- product
- forming
- convex portion
- work
- press
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車の外板パネル、
内板パネル等の鋼板からなるワークをプレス成形するプ
レス型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile outer panel,
The present invention relates to a press die for press-forming a work made of a steel plate such as an inner plate panel.
【０００２】[0002]
【従来の技術】凸起部を有するプレス成形品を得るに
は、図７に示すように下型１２に設けた部分的な凸状部
１２ｃを有する第２の押え面１２ｂ上にワークｗをセッ
トし、前記凸状部１２ｃと対向して設けられた凹状部１
１ｃを有する第１の製品成形面１１ａを有する上型１１
を下降させ、上型１１に形成した第１の押え面１１ｂと
下型１２に形成した第２の押え面１２ｂによってワーク
ｗの周縁ｗａを挾持するに下型１２の第２の製品成形面
１２ａをワークｗを介して上型１１の第１の製品成形面
１１ａに嵌合させることにより行なっている。2. Description of the Related Art To obtain a press-formed product having a raised portion, a work w is placed on a second pressing surface 12b having a partially convex portion 12c provided on a lower mold 12 as shown in FIG. The concave portion 1 provided to face the convex portion 12c
Upper mold 11 having first product molding surface 11a having 1c
Is lowered, and the first pressing surface 11b formed on the upper die 11 and the second pressing surface 12b formed on the lower die 12 hold the peripheral edge wa of the work w. Is fitted to the first product forming surface 11a of the upper mold 11 via the work w.
【０００３】これら第１，第２の製品成形面１１ａ，１
２ａ、第１，第２の押え面１１ｂ，１２ｂ，部分的な凹
状部１１ｃ及び凸状部１２ｃをプレス型に加工するに
は、倣いフライス盤やＮＣフライス盤を用いたボールエ
ンドミルや先刃テーパカッタにより切削加工を行い、更
に、切削加工により製品成形面や押え面に生じたカスプ
と称する切削跡を放電加工、電解加工、超音波研摩など
の電気及び化学的方法や電動工具等により研摩して取り
除き、第１及び第２の製品成形面１１ａ，１２ａ、部分
的な凹状部１１ｃ、部分的な凸状部１２ｃを仕上げ、更
に第１及び第２の製品成形面１１ａ，１２ａ間のクリア
ランス調整を行っている。研削を施した第１及び第２の
製品成形面１１ａ，１２ａ，凹状部１１ｃ、凸状部１２
ｃ並びに第１及び第２の押え面１１ｂ，１２ｂには必要
により耐摩耗性向上を図るため硬質クロームメッキを施
している（実開昭５３−１５０８３７号公報参照）。[0003] These first and second product forming surfaces 11a, 1
2a, the first and second pressing surfaces 11b and 12b, and the partial concave portion 11c and the convex portion 12c are formed into a press die by cutting with a ball end mill using a profile milling machine or an NC milling machine or a tapered cutter. Perform machining, and further remove the cutting traces called cusps generated on the product molding surface and presser surface by cutting by electric and chemical methods such as electric discharge machining, electrolytic machining, ultrasonic polishing, electric tools, etc. Finishing the first and second product forming surfaces 11a, 12a, the partial concave portion 11c, and the partial convex portion 12c, and adjusting the clearance between the first and second product forming surfaces 11a, 12a. I have. The ground first and second product forming surfaces 11a, 12a, concave portion 11c, convex portion 12
c and the first and second holding surfaces 11b and 12b are subjected to hard chrome plating, if necessary, in order to improve wear resistance (see Japanese Utility Model Laid-Open No. 53-150837).
【０００４】[0004]
【発明が解決しようとする課題】従来のプレス型による
と、プレス型の製品成形面及び押え面を研摩するには、
多大なる工数を必要とし、長期間に亘る製作期間が必要
となる。プレス成形の過程において、下死点上約５ｍｍ
前後でワークが局部的に延伸され、ワークが破断するこ
とが多い。この対策として、破断の発生部位近傍のプレ
ス型の再研摩、上下型のクリアランスの調整を行う。し
かしながらそれらの対策をしても破断が解決できない場
合などでは、製品形状の変更を余儀なくされるなどの不
具合がある。According to the conventional press die, in order to polish the product forming surface and the pressing surface of the press die,
A large number of man-hours are required, and a long manufacturing period is required. Approximately 5 mm above the bottom dead center during the press forming process
The work is locally stretched before and after, and the work is often broken. As a countermeasure, re-polishing of the press die near the site where the fracture occurs and adjustment of the clearance of the upper and lower dies are performed. However, when the breakage cannot be solved even by taking these measures, there is a problem that the product shape must be changed.
【０００５】従って本発明の目的は、研摩加工を廃止ま
たは軽減し、製作期間の短縮、製作コストの低減を図
り、更にプレス型の製品成形面および押え面の表面形状
をかえることにより、ワークの伸びを広範囲に亘り許容
し、プレス成形性の向上を図り得るプレス型を提供する
ことである。Accordingly, an object of the present invention is to eliminate or reduce the polishing process, shorten the manufacturing period, reduce the manufacturing cost, and change the surface shapes of the product forming surface and the pressing surface of the press die to change the shape of the work. An object of the present invention is to provide a press die capable of allowing elongation over a wide range and improving press formability.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成する本発
明のプレス型は、第１の製品成形面及び第１の製品成形
面の外周に第１の製品成形面と連続して形成した第１の
押え面とを有する上型と、第１の押え面と共同してワー
クの周縁を挾持する第２の押え面及び第２の押え面と連
続して形成され、第１の製品成形面と共同してワークに
プレス成形を施す第２の製品成形面とを有する下型とを
具備するプレス型において、上記第１の製品成形面、第
１の押え面、第２の製品成形面及び第２の押え面の内少
なくとも１つが切削加工による切削跡によって粗面状に
形成されているものであり、また第１の製品成形面を有
する上型と、第１の製品成形面と共同してワークにプレ
ス成形を施す第２の製品成形面を有する下型と、第１及
び第２の内の一方の製品成形面内に形成した凸状部と、
他方の製品成形面内に形成され、前記凸状部と共同して
ワークに凸起部をプレス成形する凹状部とを有するプレ
ス型において、上記凸状部、凹状部、製品成形面の凸状
部周縁部位及び製品成形面の凹状部周縁部位の内少なく
とも１つが切削加工による切削跡によって粗面状に形成
されているものである。According to a first aspect of the present invention, there is provided a press die having a first product forming surface and a first product forming surface formed on the outer periphery of the first product forming surface so as to be continuous with the first product forming surface. An upper die having a first pressing surface; a second pressing surface and a second pressing surface which are formed cooperatively with the first pressing surface to hold a peripheral edge of the workpiece and form a first product forming surface; And a lower die having a second product forming surface for press-forming the work in cooperation with the first product forming surface, the first pressing surface, the second product forming surface, At least one of the second pressing surfaces is formed in a rough surface shape by cutting traces formed by cutting, and the upper die having the first product forming surface and the first product forming surface cooperate with each other. A lower mold having a second product forming surface for press-forming a work, and one of the first and second molds A convex portion formed on the product forming surface within
In a press die formed in the other product molding surface and having a concave portion for press-forming a convex portion on a work in cooperation with the convex portion, the convex portion, the concave portion, and the convex shape of the product molding surface. At least one of the peripheral part of the part and the peripheral part of the concave part of the product molding surface is formed in a rough surface shape by cutting traces by cutting.
【０００７】[0007]
【作用】製品成形面、製品成形面内にある凸状部、凹状
部及び押え面等を切削加工による切削跡によって形成し
た粗面状とすることにより、多大の工数を要する研摩加
工が軽減または廃止されるので大幅な製作期間の短縮、
製作コストの低減が得られ、ワークとプレス型との接触
が面接触から点乃至線接触となり、摩擦抵抗が減少し、
プレス成形時のワークの局部的な伸びが緩和され、また
押え面でのすべり込みが向上し、絞り加工性の向上が得
られる。[Function] By making the product molding surface, the convex part, the concave part and the holding surface etc. in the product molding surface into a rough surface formed by cutting traces by cutting, the grinding work which requires a lot of man-hour is reduced or Since it will be abolished, the production time will be significantly shortened,
The production cost can be reduced, and the contact between the work and the press die changes from surface contact to point or line contact, reducing frictional resistance,
The local elongation of the work at the time of press forming is reduced, the slip on the holding surface is improved, and the drawing workability is improved.
【０００８】[0008]
【実施例】本発明のプレス型の一実施例を図によって説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the press die according to the present invention will be described with reference to the drawings.
【０００９】図１は本実施例のプレス型の要部を示す断
面図である。上型１は凸なるように湾曲する第１の製品
成形面１ａと、この第１の製品成形面１ａの外周に連続
して形成された第１の押え面１ｂを有し、更に第１の製
品成形面１ａ内に上方へ凹なる凹状部１ｃが形成されて
いる。FIG. 1 is a sectional view showing a main part of a press die according to this embodiment. The upper mold 1 has a first product molding surface 1a curved so as to be convex, and a first pressing surface 1b formed continuously on the outer periphery of the first product molding surface 1a. A concave portion 1c that is concave upward is formed in the product molding surface 1a.
【００１０】一方下型２は上型１に形成した第１の製品
成形面１ａにワークｗを介在させて嵌合するように上方
へ凹なるように湾曲する第２の製品成形面２ａと、この
第２の製品成形面２ａの外周に第２の製品成形面２ａと
連続して設けられた第２の押え面２ｂ及び第２の製品成
形面２ａ内に上型１の第１の製品成形面１ａに形成した
凹状部１ｃと嵌合してワークｗに凸起部を形成する凸状
部２ｃから構成されている。On the other hand, the lower mold 2 has a second product molding surface 2a which is curved so as to be concave upward so as to fit with the first product molding surface 1a formed on the upper mold 1 with a work w interposed therebetween. The first product molding of the upper die 1 is formed in the second pressing surface 2b and the second product molding surface 2a provided on the outer periphery of the second product molding surface 2a so as to be continuous with the second product molding surface 2a. It is composed of a convex portion 2c that fits with the concave portion 1c formed on the surface 1a to form a convex portion on the work w.
【００１１】上型１に形成した第１の製品成形面１ａ、
第１の押え面１ｂ、凹状部１ｃ及び下型２の第２の製品
成形面２ａ、第２の押え面２ｂ、凸状部２ｃは、倣いフ
ライス盤、ＮＣフライス盤等を用いて例えば刃先のＲが
半径２５ｍｍのボールエンドカッタ等によりピックフィ
ードが２ｍｍの切削加工により成形され、その表面は図
２に拡大斜視図で示すようにカスプと称する切削跡３に
より表面が凹凸な粗面状に形成される。更に、これら表
面は必要に応じ耐摩性向上を図るため図３に示すように
例えば２０〜３０μの硬質クロームメッキ４が施されて
いる。The first product molding surface 1a formed on the upper die 1
The first pressing surface 1b, the concave portion 1c, and the second product forming surface 2a, the second pressing surface 2b, and the convex portion 2c of the lower mold 2 are formed, for example, by using a profile milling machine, an NC milling machine, or the like. A pick feed is formed by a cutting process of 2 mm by a ball end cutter having a radius of 25 mm or the like, and the surface thereof is formed into an uneven rough surface by cutting marks 3 called cusps as shown in an enlarged perspective view in FIG. . Further, these surfaces are coated with, for example, hard chrome plating 4 of 20 to 30 μm as shown in FIG.
【００１２】このように構成されたプレス型を用いてプ
レス成形を行うには、上型１を上死点位置へ上昇せし
め、図１において一点鎖線で示すように、ワークｗを下
型２に形成した第２の製品成形面１ａ上に載置してセッ
トし、上型１を下降せしめ、上型１に形成した第１の押
え面１ｂ及び下型２に形成した第２の押え面２ｂの共同
によってワークｗの端部を挾持しつつ、上型１の第１の
製品成形面１ａと下型２の第２の製品成形面２ａとの間
及び第１の製品成形面１ａ内に形成された凹状部１ｃと
第２の製品成形面２ａ内に形成された凸状部２ｃとの間
によりワークｗをプレス成形する。In order to perform press molding using the press die configured as described above, the upper die 1 is raised to the top dead center position, and the work w is moved to the lower die 2 as shown by a dashed line in FIG. It is placed and set on the formed second product molding surface 1a, the upper die 1 is lowered, and the first pressing surface 1b formed on the upper die 1 and the second pressing surface 2b formed on the lower die 2 Is formed between the first product forming surface 1a of the upper mold 1 and the second product forming surface 2a of the lower mold 2 and in the first product forming surface 1a while clamping the end of the work w. The work w is press-formed between the formed concave portion 1c and the convex portion 2c formed in the second product forming surface 2a.
【００１３】この際、第１及び第２の製品成形面１ａ，
２ａ、第１及び第２の押え面１ｂ，２ｂ並びに凹状部１
ｃ、凸状部２ｃは、前述のように表面が切削跡３により
凹凸な粗面状に形成されることによって、ワークｗとの
接触が点接触または線接触となるため、ワークｗと製品
成形面１ａ，２ａ、押え面１ｂ，２ｂ、凹状部１ｃ及び
凸状部２ｃとのすべり抵抗が小となり、従来のように平
滑面に研摩した下型にあっては、図６（ａ）に示すよう
に、製品成形面２ａの略全幅ａに亘ってワークｗの伸び
が認められないのに対し、本実施例では図６（ｂ）に示
すようにワークｗの伸びが認められない範囲は製品成形
面２ａ上の狭い範囲ａのみに限られ、従ってほぼ全幅に
亘ってワークｗが伸びることにより、局部に集中した伸
びが緩和され、プレス成形性が向上する。At this time, the first and second product forming surfaces 1a,
2a, first and second pressing surfaces 1b, 2b and concave portion 1
c, since the surface of the convex portion 2c is formed into a rough surface with irregularities by the cutting traces 3 as described above, the contact with the work w becomes a point contact or a line contact. The slip resistance between the surfaces 1a, 2a, the holding surfaces 1b, 2b, the concave portion 1c, and the convex portion 2c becomes small, and the lower die polished to a smooth surface as in the conventional case is shown in FIG. As described above, while the work w does not extend over substantially the entire width a of the product molding surface 2a, in the present embodiment, as shown in FIG. The work w is limited to only a narrow range a on the forming surface 2a, and therefore, the work w extends over almost the entire width, so that the elongation concentrated on a local area is relaxed, and the press formability is improved.
【００１４】押え面１ｂ，２ｂ間によるワークｗの伸び
も同様に許容されることにより更にすべり込みが向上
し、プレス成形が良好なものとなる。The extension of the work w between the pressing surfaces 1b and 2b is also allowed, so that the slip is further improved and the press forming becomes good.
【００１５】また上記実施例では、切削跡によって粗面
に形成したが、図４に示すように、例えば刃先のＲが半
径２５ｍｍのボールエンドカッタによりピッチフィード
２ｍｍで切削加工した表面の切削跡３の頂部３ａを切削
跡の底部から５〜１０μ残して研摩し、頂面を平坦に加
工することにより、ワークｗとの接触性を良好にし、ワ
ークｗと頂部３ａの接触による傷の発生を防止すること
ができる。更にこれら表面に必要に応じ、耐摩耗性向上
を図るため図５のように前記同様厚さ２０〜３０μの硬
質クロムメッキ４を施すことができる。Further, in the above embodiment, the rough surface is formed by the cutting trace. However, as shown in FIG. 4, for example, the cutting trace 3 of the surface cut by a ball end cutter having a radius of 25 mm with a pitch feed of 2 mm is used. The top 3a is polished while leaving 5 to 10 μm from the bottom of the cutting trace, and the top surface is flattened to improve the contact with the work w and prevent the generation of scratches due to the contact between the work w and the top 3a. can do. If necessary, hard chromium plating 4 having a thickness of 20 to 30 .mu.m can be applied to these surfaces as shown in FIG.
【００１６】以上説明では、上型及び下型の製品成形面
１ａ，２ａ、押え面１ｂ，２ｂ、凹状部１ｃ及び凸状部
２ｃに切削加工による粗面を施したが、製品形状、材質
等を考慮し、適宜部位、例えば上型１に形成した凹状部
１ｃ、第１の製品成形面１ａの凹状部１ｃの周縁部位１
ｄ及び下型２に形成した凸状部２ｃ、第２の製品成形面
２ａの凸状部２ｃの周縁部位２ｄのみに切削加工による
粗面を形成することも可能である。また第１の製品成形
面内に凹状部を、第２の製品成形面内に凸状部を設けた
実施例について記載したが、逆に第１の製品成形面内に
凸状部を、第２の製品成形面内に凹状部を設けることも
可能であり、更に複数個の凸状部及び凹状部を設けるこ
とも可能である。In the above description, rough surfaces are formed by cutting on the product molding surfaces 1a and 2a, the holding surfaces 1b and 2b, the concave portions 1c and the convex portions 2c of the upper and lower dies. In consideration of the above, an appropriate portion, for example, the concave portion 1c formed in the upper mold 1, the peripheral portion 1 of the concave portion 1c of the first product molding surface 1a.
It is also possible to form a rough surface by cutting only on the peripheral portion 2d of the convex portion 2c formed on the lower die 2 and the convex portion 2c of the second product molding surface 2a. In addition, although the embodiment in which the concave portion is provided in the first product molding surface and the convex portion is provided in the second product molding surface is described, the convex portion is provided in the first product molding surface. It is also possible to provide a concave portion in the product molding surface of No. 2, and it is also possible to provide a plurality of convex portions and concave portions.
【００１７】[0017]
【発明の効果】本発明によれば、プレス型の製品成形
面、押え面、製品成形面に形成した凸状部及び凹状部等
を研削により粗面状に形成することにより、従来の多大
なる工数を要していた研摩加工を廃止または大幅な軽減
が図れ、製作期間の短縮、製作コストの低減が得られ、
更に、プレス成形時におけるワークとのプレス型の接触
面を点接触乃至線接触とすることにより、成形時のワー
クのすべり込みが良好になり、プレス成形性の向上が得
られ、プレス成形品に発生する破断、プレス型の修正研
摩の軽減が期待できる。According to the present invention, a product forming surface, a pressing surface, and a convex portion and a concave portion formed on the product forming surface of a press die are formed into a rough surface by grinding, thereby increasing the conventional size. Abrasion processing that required man-hours can be eliminated or greatly reduced, shortening the manufacturing period and reducing manufacturing costs.
Furthermore, by making the contact surface of the press die with the work at the time of press forming point contact or linear contact, the slip of the work at the time of forming is improved, the press formability is improved, and the press formed product is produced. This can be expected to reduce the occurrence of breakage and correction polishing of the press die.
【図１】本発明のプレス型の一実施例を示す要部断面図
である。FIG. 1 is a sectional view showing a main part of an embodiment of a press die according to the present invention.
【図２】同じくプレス型の要部拡大斜視図である。FIG. 2 is an enlarged perspective view of a main part of the press die.
【図３】他の実施例のプレス型の要部拡大斜視図であ
る。FIG. 3 is an enlarged perspective view of a main part of a press die according to another embodiment.
【図４】更に他の実施例のプレス型の要部拡大斜視図で
ある。FIG. 4 is an enlarged perspective view of a main part of a press die according to still another embodiment.
【図５】更に他の実施例のプレス型の要部拡大斜視図で
ある。FIG. 5 is an enlarged perspective view of a main part of a press die according to still another embodiment.
【図６】本実施例と従来例との対比説明図である。FIG. 6 is a diagram illustrating a comparison between the present embodiment and a conventional example.
【図７】従来のプレス型の要部断面図である。FIG. 7 is a sectional view of a main part of a conventional press die.
１ 上型 １ａ 第１の製品成形面 １ｂ 第２の押え面 １ｃ 凹状部 １ｄ 凹状部周縁 ２ 下型 ２ａ 第２の製品成形面 ２ｂ 第２の押え面 ２ｃ 凸状部 ２ｄ 凸状部周縁 ３ 切削跡 ３ａ 頂部 ｗ ワーク Reference Signs List 1 upper die 1a first product forming surface 1b second pressing surface 1c concave portion 1d concave portion peripheral edge 2 lower die 2a second product forming surface 2b second pressing surface 2c convex portion 2d convex portion peripheral edge 3 cutting Trace 3a Top w Work
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B21D 37/20 B21D 24/00 B30B 15/02──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 6 , DB name) B21D 37/20 B21D 24/00 B30B 15/02
Claims (6)
の外周に第１の製品成形面と連続して形成した第１の押
え面とを有する上型と、第１の押え面と共同してワーク
の周縁を挾持する第２の押え面及び第２の押え面と連続
して形成され、第１の製品成形面と共同してワークにプ
レス成形を施す第２の製品成形面とを有する下型とを具
備するプレス型において、上記第１の製品成形面、第１
の押え面、第２の製品成形面及び第２の押え面の内少な
くとも１つが切削加工による切削跡によって粗面状に形
成されていることを特徴とするプレス型。An upper die having a first product forming surface and a first pressing surface formed continuously with the first product forming surface on an outer periphery of the first product forming surface; and a first pressing surface. And a second product forming surface formed continuously with the second pressing surface and the second pressing surface for clamping the peripheral edge of the work in cooperation with the first product forming surface for pressing the work in cooperation with the first product forming surface. And a lower die having: a first product forming surface;
Wherein at least one of the pressing surface, the second product forming surface, and the second pressing surface is formed into a rough surface by cutting traces formed by cutting.
た請求項１のプレス型。2. The press die according to claim 1, wherein the tops of the projections of the irregularities forming the rough surface are ground.
底部から５〜１０μ残して研削した請求項２のプレス
型。3. The press die according to claim 2, wherein the convex portion of the unevenness forming the rough surface is ground leaving 5 to 10 μm from the bottom portion of the concave portion.
の製品成形面と共同してワークにプレス成形を施す第２
の製品成形面を有する下型と、第１及び第２の内の一方
の製品成形面内に形成した凸状部と、他方の製品成形面
内に形成され、前記凸状部と共同してワークに凸起部を
プレス成形する凹状部とを有するプレス型において、上
記凸状部、凹状部、製品成形面の凸状部周縁部位及び製
品成形面の凹状部周縁部位の内少なくとも１つが切削加
工による切削跡によって粗面状に形成されていることを
特徴とするプレス型。4. An upper mold having a first product molding surface,
Of press forming work in cooperation with product forming surface
A lower mold having a product molding surface, a convex portion formed in one of the first and second product molding surfaces, and a convex portion formed in the other product molding surface and cooperating with the convex portion. In a press die having a concave portion for press-forming a convex portion on a work, at least one of the convex portion, the concave portion, the peripheral portion of the convex portion of the product molding surface, and the peripheral portion of the concave portion of the product molding surface is cut. A press die characterized by being formed in a rough surface by cutting traces of processing.
た請求項４のプレス型。5. The press die according to claim 4, wherein the tops of the projections of the irregularities forming the rough surface are ground.
底部から５〜１０μ残して研削した請求項５のプレス
型。6. The press die according to claim 5, wherein the convex portion of the unevenness forming the rough surface is ground leaving 5 to 10 μm from the bottom of the concave portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41515490A JP2857497B2 (en) | 1990-12-27 | 1990-12-27 | Press mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41515490A JP2857497B2 (en) | 1990-12-27 | 1990-12-27 | Press mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04228231A JPH04228231A (en) | 1992-08-18 |
| JP2857497B2 true JP2857497B2 (en) | 1999-02-17 |
Family
ID=18523555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP41515490A Expired - Lifetime JP2857497B2 (en) | 1990-12-27 | 1990-12-27 | Press mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2857497B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6807838B2 (en) | 2000-12-06 | 2004-10-26 | Kobe Steel, Ltd. | Press die |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3435972B2 (en) * | 1996-03-26 | 2003-08-11 | トヨタ自動車株式会社 | Mold manufacturing method |
-
1990
- 1990-12-27 JP JP41515490A patent/JP2857497B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6807838B2 (en) | 2000-12-06 | 2004-10-26 | Kobe Steel, Ltd. | Press die |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04228231A (en) | 1992-08-18 |
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