JPH02101102A - Material for metallic mold - Google Patents
Material for metallic moldInfo
- Publication number
- JPH02101102A JPH02101102A JP25329488A JP25329488A JPH02101102A JP H02101102 A JPH02101102 A JP H02101102A JP 25329488 A JP25329488 A JP 25329488A JP 25329488 A JP25329488 A JP 25329488A JP H02101102 A JPH02101102 A JP H02101102A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- powder
- added
- metallic mold
- short fiber
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 3
- 238000000465 moulding Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 229910021382 natural graphite Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000013022 venting Methods 0.000 abstract 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 239000011148 porous material Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、全面にわたって通気用の細孔を有する金型を
製作するための型材に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold material for manufacturing a mold having pores for ventilation over its entire surface.
（従来技術と問題点）
従来、プラスチックスの真空成形、圧空成形、ブロー成
形、射出成形、あるいは金属の重力金型鋳造、低圧金型
鋳造、グイキャスト鋳造等に使用される金型は、通気の
ために細孔、スリット１あるいはベントプラグ等の加工
が施されるのが一般的である。しかしこれらの加工は局
部的であるため均一な空気抜けができないと共に加工が
製品に転写される等の問題がある。(Prior art and problems) Conventionally, molds used for vacuum forming, pressure forming, blow molding, injection molding of plastics, or gravity mold casting, low pressure mold casting, guicast casting of metal, etc. For this purpose, processing such as pores, slits 1, or vent plugs is generally performed. However, since these processes are localized, there are problems such as not allowing uniform air release and the process being transferred to the product.
上記の問題を解決するものとして最近ではセラミックス
粉と金属粉とを混合した材料を粉末冶金の手法を用いて
成形焼結した型が開発されている。In order to solve the above problems, molds have recently been developed in which a mixture of ceramic powder and metal powder is molded and sintered using a powder metallurgy technique.
このような型は、微細な空孔が全面にわたって均一に分
布しているため、空気抜けがよい上に空孔が微細である
ため・製品に転写されることもない等の利点を有する反
面、粉体が点接触により焼結されているため強さ及び靭
性に欠けるという問題がある。This type of mold has fine pores evenly distributed over the entire surface, which allows for good air release, and the pores are so small that they do not transfer onto the product. Since the powder is sintered by point contact, there is a problem in that it lacks strength and toughness.
（目 的）
本発明は、上記の問題に鑑みて成されたもので、全面に
わたって通気用の微細空孔を有しかつ強度及び靭性にす
ぐれた金型用型材を提供することな目的とするものであ
る。(Purpose) The present invention was made in view of the above-mentioned problems, and an object thereof is to provide a mold material having fine pores for ventilation over the entire surface and having excellent strength and toughness. It is something.
（問題点を解決するための手段）
本発明は、ワイヤー切削法により製造した太さ１００μ
ｍ以下の鉄系長繊維を寸断して得たアスペクト比３０〜
１００の短繊維に、炭素粉を０５〜Ｌ ２ ｗｔ％添加
すると共に必要に応じてＣ「粉及びＭｎ粉を加えて混合
した混合材料を、プレス成形用型もしくはＣＩＰ法用ラ
バー型内に均一密度に充填し、０５〜ｇ ｔｏｎ／ｃ−
の加圧力で加圧成形した後還元性雰囲気にて加熱焼結す
ると共に必要に応じて熱処理を施して成る金型用型材で
ある。(Means for Solving the Problems) The present invention provides a 100 μm thick wire manufactured by a wire cutting method.
Aspect ratio 30 ~ obtained by shredding iron-based long fibers of 30 m or less
100 short fibers, add 05 to L 2 wt% of carbon powder, and add C powder and Mn powder as necessary, and mix the mixed material uniformly in a press molding mold or a rubber mold for CIP method. Packed to a density of 05~g ton/c-
This mold material is formed by pressure molding with a pressure of 100 ml, followed by heating and sintering in a reducing atmosphere, and subjecting it to heat treatment if necessary.
（作 用）
本発明は、主材料として鉄系の短繊維を使用する。その
代表例は、化学成分がＣ： ０．１〜０．１５％、Ｓｉ
： ０．０５〜０．１％、Ｍｎ ！ ０．９〜１５％の
低Ｍｎ鋼であり、この化学成分から成る線材をワイヤー
切削法で削り出すことにより直径換算で１０〜５０μｍ
の長繊維を作り、この長繊維をカッターミル等で寸断す
るか、若しくは寸断後ふるいで選別するなどしてアスペ
クト比３０〜１００の短繊維を得る。(Function) The present invention uses iron-based short fibers as the main material. A typical example is that the chemical components are C: 0.1-0.15%, Si
: 0.05-0.1%, Mn! It is a low Mn steel with a content of 0.9 to 15%, and by cutting a wire made of this chemical composition using a wire cutting method, it has a diameter of 10 to 50 μm.
The long fibers are made into long fibers, and the long fibers are shredded with a cutter mill or the like, or after being shredded, they are sorted with a sieve to obtain short fibers with an aspect ratio of 30 to 100.
この短繊維は、ワイヤー切削法により削り出されたもの
を寸断したものであるため繊維軸線が切削方向と平行で
あり、全体としてカール気味になり、かつ繊維軸線と直
角の断面が割面状若しくは偏平矩形であり、全体として
帯状を呈している。Since these short fibers are cut into pieces by wire cutting, the fiber axis is parallel to the cutting direction, and the overall shape is slightly curled, and the cross section perpendicular to the fiber axis has a split or split surface shape. It has a flat rectangular shape and has a band-like shape as a whole.
さらに材質的には、低炭素、低シリコンの鋼であり、強
さが格段に良好であると共に熱処理に優れている。Furthermore, the material is low-carbon, low-silicon steel, which has extremely good strength and is excellent in heat treatment.
このようにして得た短繊維に炭素粉を０５〜１２ｗｔ％
添加すると共に必要に応じてＣｒ粉及びＭｎ粉を加えて
混合した混合材料をプレス成形用型若しくはＣＩＰ法用
ラバー型内に均一・に充填すると共に所要の圧力により
加圧成形して圧粉体を得る。05 to 12 wt% of carbon powder is added to the short fibers obtained in this way.
Cr powder and Mn powder are added and mixed as necessary, and the mixed material is uniformly filled into a press molding mold or a rubber mold for CIP method, and then pressure molded with the required pressure to form a green compact. get.
この圧粉体をアンモニア分解ガス、あるいは水素ガス等
の還元性雰囲気にて加熱焼結したものである。これによ
り、全面に微細な空孔を有し、かつ強度及び靭性にすぐ
れた金型用型材が得られる。This green compact is heated and sintered in a reducing atmosphere such as ammonia decomposition gas or hydrogen gas. As a result, a mold material having fine pores all over the surface and having excellent strength and toughness can be obtained.
尚この金型用型材は熱処理を施すことによりさらに強度
を向上させることができる。The strength of this mold material can be further improved by subjecting it to heat treatment.
（実施例）
化学成分がＣ：０．１３％％８ｉ：０．０８％、Ｍｎ：
１１３％の低Ｍｎ１ｌ線材３〜５闘φをワイヤー切削法
により切削して直径換算２５〜４０μｍの長繊維を作り
、これをカッターミルで寸断して長さ０．４〜Ｌ６Ｉ１
１＋＋１とした短繊維を得た。この短繊維に添加炭素と
して天然黒鉛粉Ｌ Ｏｗｔ％を添加して混合した混合材
料をＣＩＰ法用ラバー型に充填してＬ ５ ｔｏｎ／ｅ
ｒａ の加圧力により加圧成形して圧粉体を得た後、こ
の圧粉体を水素ガス雰囲気中にて１１４０℃の加熱湯度
により２時間保持して加熱焼結し、金型用型材を得た。(Example) Chemical components are C: 0.13%, 8i: 0.08%, Mn:
A 113% low Mn1L wire rod 3 to 5 mm diameter is cut using a wire cutting method to produce long fibers with a converted diameter of 25 to 40 μm, and this is cut into pieces with a cutter mill to lengths of 0.4 to L6I1.
Short fibers with a rating of 1++1 were obtained. A mixed material prepared by adding L Owt% of natural graphite powder as added carbon to the short fibers was filled into a rubber mold for the CIP method to produce L 5 ton/e.
After obtaining a compact by pressure molding with a pressure of ra, the compact was heated and sintered by holding it in a hydrogen gas atmosphere at a temperature of 1140°C for 2 hours to obtain a mold material. I got it.
さらにこの金型用型材に熱処理を施してプラスチックイ
ンジェクション用金型を製作した。Furthermore, this mold material was heat treated to produce a plastic injection mold.
このようにして製作した金型により射出成形された成形
品の出来上りは良好で、射出成形圧も従来の約２／３で
よく、特にコーナ部のガス欠陥のない成形品が得られた
。The molded product injection-molded using the mold thus manufactured had a good quality, the injection molding pressure was only about 2/3 that of the conventional method, and a molded product without gas defects, especially in the corners, was obtained.
なお、上記により得られた熱処理後の金型用型材の特性
値を表１に示すと共に組織の顕微鏡写真な第１図に示す
。尚顕微鏡写真において黒い部分が開空孔である。The characteristic values of the heat-treated mold material obtained above are shown in Table 1, and a microscopic photograph of the structure is shown in FIG. In the micrograph, the black parts are open pores.
表 １
（混合成形テスト）
化学成分がｃ ： ０．１３％、Ｓｉ：００８％、Ｍｎ
：１１３％の低Ｍｎ＠ｌ材３〜５鰭φをワイヤー切削法
により切削して直径換算２５〜４０μｍの長繊維を作り
、この長繊維をスライバーカットにて、０、９〜１．２
ｔｎｍ、１５〜２９ｍ、２．５〜３．０１１１８．３
．５〜４５闘、５０〜５．５鴎の５種類の短繊維を得て
混合成形テストを行なった。Table 1 (Mixed molding test) Chemical components are c: 0.13%, Si: 008%, Mn
: 113% low Mn@l material 3 to 5 fin diameter is cut by wire cutting method to make long fibers with a diameter equivalent to 25 to 40 μm, and this long fiber is sliver cut to 0, 9 to 1.2
tnm, 15-29m, 2.5-3.01118.3
．． Five types of short fibers, 5 to 45 mm and 50 to 5.5 mm, were obtained and mixed molding tests were conducted.
３５〜４５闘の短繊維で７１イバーボールを形成し、混
合むらが生じ５０〜５．５ｍのものはその程度が極めて
大きいものであった。71 ivar balls were formed with short fibers of 35 to 45 m long, and uneven mixing occurred, and the extent of the mixing was extremely large in the case of 50 to 5.5 m long fibers.
また０９〜Ｌ２Ｎの短繊維は、繊維が粉状となりからみ
合いが少なく圧粉体の強度が弱いものであった。In addition, the short fibers of 09 to L2N were powder-like and had little entanglement, resulting in a weak green compact.
１５ ｍｍ−１０ｍｍ （７７，ヘ９ト比的３Ｏ−７０
）及び３５〜３０朋（アスペクト比的５０〜１００）の
ものはファイバーボールも生ぜず良好な繊維のからみ合
った圧粉体が得られた。15 mm-10mm (77, 3O-70
) and 35 to 30 mm (aspect ratio: 50 to 100), no fiber balls were formed and green compacts with good fiber entanglement were obtained.
（添加元素テスト）
直径換８２５〜４０ ｐｒｎ、長さλ５〜３０１１１Ｉ
１１の前記短繊維を用いて各種添加元素の影響を調査し
た。(Additional element test) Diameter conversion 825~40 prn, length λ5~30111I
The influence of various additive elements was investigated using 11 short fibers.
ｌ）炭素について
炭素は鉄中に固溶され、強さ、硬さ、熱処理性を向上さ
せる上で欠くことのできない添加元素であり、第２図、
及び第３図に示すように炭素量が０５Ｗ１％までは強さ
、硬さ、とも上昇する。これは鉄母地がパーライト化が
進むためである。さらに炭素量が０５〜Ｌ Ｏｗｔ％ま
では、強さがほぼ一定となり、硬さは０．５〜ｌ ５
ｗｔ％までほぼ−・定となる。一方炭素量がＬ２ｗｔ％
以上になると機械的性質にはあまり影響がなくとも顕微
鏡組織上は残留黒鉛がみられるようになり成形品に黒鉛
が付着するようになる。l) About carbon Carbon is a solid solution in iron and is an essential additive element for improving strength, hardness, and heat treatability.
As shown in FIG. 3, both strength and hardness increase when the carbon content reaches 05W1%. This is because the iron matrix becomes pearlite. Furthermore, when the carbon content reaches 05~L Owt%, the strength becomes almost constant, and the hardness increases from 0.5~L5.
It becomes almost constant up to wt%. On the other hand, the carbon content is L2wt%
If the temperature exceeds this level, residual graphite will be visible on the microscopic structure, and graphite will adhere to the molded product, even if the mechanical properties are not affected much.
２）Ｃ「について
第４図に示すようにＣｒは、添加量が２〜３％をピーク
に５ ｗｔ％までは実用強度及び硬さを有する。これは
Ｃ「を添加することにより非常に硬いがもろいセメンタ
イト相の体積率が上昇するためである。2) Regarding C, as shown in Figure 4, Cr has practical strength and hardness at a peak addition amount of 2 to 3% and up to 5 wt%. This is because the volume fraction of the brittle cementite phase increases.
すなわち２〜３％のＣｒ添加により析出するセメンタイ
ト相の量が強さ及び硬さに有効である。That is, the amount of cementite phase precipitated by addition of 2 to 3% Cr is effective for improving strength and hardness.
３） Ｍｎについて
短繊維中に１％強のＭｎが含まれているため材料自体強
さ、硬さ、熱処理特性に優れているが第５図に示すよう
にＭｙ＋の添加量が２，５ｗ１％までは実用強度、硬さ
を有するが添加量が２０ｗｔ％をこすと熱処理後残留オ
ーステナイト量が増加し、型使用中に亀裂が発生する原
因となる。3) About Mn Since the short fibers contain over 1% Mn, the material itself has excellent strength, hardness, and heat treatment properties, but as shown in Figure 5, the amount of My+ added is 2.5w1%. It has practical strength and hardness up to 20 wt%, but when the amount added exceeds 20 wt%, the amount of retained austenite increases after heat treatment, which causes cracks to occur during mold use.
（加圧テスト）
上記添加元素テストに使用した短繊維をＣ１ｌ’法によ
り加圧成形して圧粉体を作り、これを焼成し、その影響
を調べた。(Pressure test) The short fibers used in the above additive element test were pressure-molded by the C1l' method to produce a green compact, which was fired, and its influence was investigated.
第６図に示す通り成形圧が上昇するに従い強さが向上す
る。これは密度が上昇するためであるがそれは逆に通気
のための残留空孔を少なくすることを意味する。ＪＣＩ
Ｐ法成形の場合、成形圧４ ｔｏｒｙｌＪ（プレス成形
圧８ ｔｏ口／Ｃ−とほぼ同様な密度が得られる）の場
合残留空孔率が１５％弱となり金型の通気性に若干問題
が生じる。As shown in FIG. 6, the strength increases as the molding pressure increases. This is because the density increases, but it also means that there are fewer remaining pores for ventilation. JCI
In the case of P method molding, when the molding pressure is 4 torylJ (a density almost the same as press molding pressure 8 to/C- can be obtained), the residual porosity is less than 15%, causing some problems with the air permeability of the mold. .
（発明の効果）
本発明の型材により製作される金型は全面に微細で均一
な閉空孔を有するため、通気用の孔加工を一切必要とせ
ず、また強度及び靭性に優れた特性を有する型にするこ
とができる等種々の効果がある。(Effects of the Invention) Since the mold manufactured using the mold material of the present invention has fine and uniform closed pores on the entire surface, it does not require any hole processing for ventilation, and has excellent strength and toughness. There are various effects such as the ability to
第１図は実施例により得られた金型用型材の熱処理後の
顕微鏡写真、第２図は炭素量と圧環強さの関係を示すグ
ラフ、第３図は炭素量と硬さの関係を示すグラフ、第４
図はｃｒ添加量と圧環強さ、及び硬さの関係を示すグラ
フ、第５図はＭｎ添加量と圧環強さ及び硬さの関係を示
すグラフ、第６＠はｃｒｐ法成形圧と圧環強さの関係を
示すグラフである。
図面の浄書（内容に変更なし）
図面の浄書（内容に変更なし）
図面の浄書（内容に変更なし）
片如Ｍｎｔ（畦％）
等
悶
手
続
ネｒｌｉ
正
書
（方
式）
平成１年２月ノ％３日Figure 1 is a micrograph of the mold material obtained in the example after heat treatment, Figure 2 is a graph showing the relationship between carbon content and radial crushing strength, and Figure 3 is a graph showing the relationship between carbon content and hardness. Graph, 4th
The figure is a graph showing the relationship between the amount of Cr added and the radial crushing strength and hardness. Figure 5 is the graph showing the relationship between the amount of Mn added and the radial crushing strength and hardness. The sixth @ is the graph showing the relationship between the amount of Mn added and the radial crushing strength and hardness. It is a graph showing the relationship between Engraving of the drawing (no change in the content) Engraving of the drawing (no change in the content) Engraving of the drawing (no change in the content) Katana Mnt (Round %) Equal procedure nerli Official copy (method) February 1999 %3 days
Claims (1)
系長繊維を寸断して得たアスペクト比３０〜１００の短
繊維に、炭素粉を０．５〜１．２ｗｔ％添加すると共に
必要に応じてＣｒ粉及びＭｎ粉を加えて混合した混合材
料を、プレス成形用型もしくはＣＩＰ法用ラバー型内に
均一密度に充填し、０．５〜８ｔｏｎ／ｃｍ＾２の加圧
力で加圧成形した後、還元性雰囲気にて加熱焼結すると
共に必要に応じて熱処理を施して成る金型用型材。0.5 to 1.2 wt% of carbon powder is added to short fibers with an aspect ratio of 30 to 100 obtained by cutting iron-based long fibers with a thickness of 100 μm or less produced by a wire cutting method, and Cr is added as necessary. The mixed material mixed with powder and Mn powder is filled into a press molding mold or a rubber mold for CIP method at a uniform density, and after pressure molding with a pressure of 0.5 to 8 ton/cm^2, A mold material made by heating and sintering in a reducing atmosphere and subjecting it to heat treatment if necessary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25329488A JPH02101102A (en) | 1988-10-07 | 1988-10-07 | Material for metallic mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25329488A JPH02101102A (en) | 1988-10-07 | 1988-10-07 | Material for metallic mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02101102A true JPH02101102A (en) | 1990-04-12 |
Family
ID=17249288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25329488A Pending JPH02101102A (en) | 1988-10-07 | 1988-10-07 | Material for metallic mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02101102A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0868955A1 (en) * | 1997-01-29 | 1998-10-07 | PIRELLI COORDINAMENTO PNEUMATICI S.p.A. | Method of producing tyres, of making vulcanization moulds for said tyres, tyres and moulds thus produced |
| US10907657B2 (en) | 2016-12-02 | 2021-02-02 | Eagle Industry Co., Ltd. | Accumulator |
-
1988
- 1988-10-07 JP JP25329488A patent/JPH02101102A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0868955A1 (en) * | 1997-01-29 | 1998-10-07 | PIRELLI COORDINAMENTO PNEUMATICI S.p.A. | Method of producing tyres, of making vulcanization moulds for said tyres, tyres and moulds thus produced |
| US10907657B2 (en) | 2016-12-02 | 2021-02-02 | Eagle Industry Co., Ltd. | Accumulator |
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