JPH0649948B2 - Method for producing grain-oriented electrical steel sheet having metallic luster excellent in punching property - Google Patents
Method for producing grain-oriented electrical steel sheet having metallic luster excellent in punching propertyInfo
- Publication number
- JPH0649948B2 JPH0649948B2 JP63260570A JP26057088A JPH0649948B2 JP H0649948 B2 JPH0649948 B2 JP H0649948B2 JP 63260570 A JP63260570 A JP 63260570A JP 26057088 A JP26057088 A JP 26057088A JP H0649948 B2 JPH0649948 B2 JP H0649948B2
- Authority
- JP
- Japan
- Prior art keywords
- annealing
- steel sheet
- oriented electrical
- electrical steel
- grain
- 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 - Fee Related
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は打抜き性の優れた金属光沢を有する方向性電磁
鋼板の製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for producing a grain-oriented electrical steel sheet having a metallic luster excellent in punchability.
（従来の技術） 方向性電磁鋼板は一般に次のようにして製造される。Si
を0.4％以下含有する電磁鋼スラブを熱間圧延し、熱延
板まま或いは熱延板焼鈍後、１回または中間焼鈍を挟ん
で２回以上の冷間圧延を施して最終板厚とし、脱炭焼鈍
を行って鋼板表面にSiO2を含む酸化膜を生成させ、次い
でMgOを主成分とする焼鈍分離剤を塗布して乾燥し、コ
イルに巻取り、その後、仕上焼鈍を行いゴス方位を有す
る２次再結晶粒を発達させるとともに、絶縁性および磁
気特性の向上のため前記SiO2とMgOの反応によりグラス
被膜を形成させている。次いで必要に応じて絶縁コーテ
ィング液を塗布し、焼付熱処理を行って絶縁コーティン
グ被膜を形成させる。(Prior Art) A grain-oriented electrical steel sheet is generally manufactured as follows. Si
Magnetic steel slab containing 0.4% or less of aluminum is hot-rolled, and as-rolled or after hot-rolled sheet annealing, cold rolling is performed once or twice with intervening intermediate annealing to obtain the final sheet thickness and Charcoal annealing is performed to form an oxide film containing SiO 2 on the surface of the steel sheet, then an annealing separator containing MgO as a main component is applied and dried, and then wound on a coil, and then finish annealing is performed to have a Goss orientation. In addition to developing secondary recrystallized grains, a glass film is formed by the reaction between the SiO 2 and MgO in order to improve the insulating property and magnetic properties. Then, if necessary, an insulating coating solution is applied, and a baking heat treatment is performed to form an insulating coating film.
方向性電磁鋼板は発電機、変圧器などの電気機器の鉄心
材として用いられる。鉄心は通常金型にて打抜かれ、或
いは剪断により、所定形状とされた鉄心単板を多数枚積
層して製作される。例えばタービン発電機の鉄心を製作
するにはその容量にもよるが１０万〜２０万枚の鉄心単
板を要する。これら鉄心単板は打抜き返りが小さいこと
例えば３０μｍ以下であることが、当該鉄心単板を積層
した場合、鉄心の端面短絡による鉄損の異常増加を防止
するのに重要である。また鉄心製作加工を容易とするた
めにも打抜き返りが小さいことが望まれる。The grain-oriented electrical steel sheet is used as a core material for electric devices such as generators and transformers. The iron core is usually punched with a mold or sheared to produce a large number of laminated single iron core plates. For example, manufacturing an iron core of a turbine generator requires 100,000 to 200,000 single iron core plates, depending on its capacity. It is important that these core single plates have a small punch-back, for example, 30 μm or less, in order to prevent an abnormal increase in iron loss due to an end face short circuit of the core when the core single plates are laminated. Further, it is desired that the punching back be small in order to facilitate the iron core manufacturing process.
方向性電磁鋼板にはグラス被膜或いは該被膜と絶縁コー
ティング被膜の２重の絶縁被膜が形成されている。これ
ら絶縁被膜は鋼板に張力を与えて鉄損を低下させる作用
があるが、反面、グラス被膜は硬質であるために打抜き
を行う際、金型を摩耗せしめる。このため例えば数1000
回打抜くと、打抜き返りが所定値以上発生し、金型の再
研磨或いは新品との取替えを行わなければならない。こ
れは作業性を著しく低下させ、またコスト上昇などを招
くことになる。On the grain-oriented electrical steel sheet, a glass coating or a double insulating coating of the coating and an insulating coating is formed. These insulating coatings have the effect of applying tension to the steel sheet to reduce iron loss, but, on the other hand, the glass coating is hard and therefore wears the die during punching. So, for example, a few thousand
If punching is performed twice, the punching back will be over a predetermined value, and the mold must be re-polished or replaced with a new one. This significantly lowers the workability and raises the cost.
打抜き性を高めるために、グラス被膜の生成を抑制した
方向性電磁鋼板の製造方法が提案されている。例えば特
開昭53-22113号公報では脱炭焼鈍で形成する電磁鋼板表
面の酸化膜厚みを３μｍ以下とし、焼鈍分離剤として含
水珪酸塩鉱物粉末を配合した微粒子のアルミナを用いて
鋼板に塗布し、仕上焼鈍している。かくして酸化膜の薄
目付きとアルミナを主成分とした前記焼鈍分離剤によっ
て剥離しやすいグラス被膜を鋼板に形成して、打抜き性
の向上が図られている。In order to improve the punching property, a method for producing a grain-oriented electrical steel sheet in which the formation of a glass coating is suppressed has been proposed. For example, in Japanese Unexamined Patent Publication No. 53-22113, the thickness of the oxide film on the surface of an electromagnetic steel sheet formed by decarburization annealing is set to 3 μm or less, and fine particles of alumina containing hydrous silicate mineral powder as an annealing separator are applied to a steel sheet. , Finish annealing. Thus, the glass film having a thin oxide film and the above-mentioned annealing separator containing alumina as a main component is formed on the steel sheet so as to be easily peeled off to improve the punchability.
また特開昭59-96278号公報では焼鈍分離剤として、粒の
大きさが１０μｍ以下の微粒子アルミナと1300℃以上の
高温焼成した不活性MgOを用いることにより、鋼板表面
の酸化膜との反応を抑制して、グラス被膜の形成を防ぎ
或いは剥離しやすいものとし、打抜き性の向上を図って
いる。Further, in JP-A-59-96278, the reaction with the oxide film on the surface of the steel sheet is made possible by using, as the annealing separator, fine particle alumina having a grain size of 10 μm or less and inert MgO which has been fired at a high temperature of 1300 ° C. or more. It suppresses the formation of a glass coating or makes it easy to peel off to improve the punchability.
（発明が解決しようとする課題） これらによるとそれなりの効果があり、方向性電磁鋼板
の表面のグラス被膜形成が抑制され、打抜き性が改善さ
れている。しかし、実操業ライン例えば脱炭焼鈍では雰
囲気ガスの制御を行っているが、焼鈍炉内で雰囲気ガス
の露点や組成に差異が生じることがあり、また温度偏差
などの影響もあって鋼板表面に生成される酸化膜は鋼板
位置内で厚みや組成に差異が生じる。(Problems to be Solved by the Invention) According to these, there is a certain effect, the formation of the glass film on the surface of the grain-oriented electrical steel sheet is suppressed, and the punchability is improved. However, in the actual operation line such as decarburization annealing, the atmosphere gas is controlled, but there may be differences in the dew point and composition of the atmosphere gas in the annealing furnace. The generated oxide film has a difference in thickness and composition within the position of the steel sheet.
また、従来のグラス被膜形成防止は、焼鈍分離剤の主成
分のアルミナが酸化膜中のSiO2との反応性が弱いことを
活用して、被膜形成を抑制しようとするのであるが、前
記酸化膜の組成や厚みの差異が影響し、グラス被膜の剥
離性に部分的な差を生じて、打抜き性が必ずしも良好と
ならないことがある。Further, conventional glass film formation prevention attempts to suppress the film formation by utilizing the fact that the main component of the annealing separator, alumina, has a weak reactivity with SiO 2 in the oxide film. The difference in the composition and thickness of the film may affect the peelability of the glass coating partially, and the punchability may not always be good.
本発明は脱炭焼鈍工程までの酸化膜形成条件の影響や、
焼鈍分離剤MgOの物性の如何にかかわらず、鋼板全面に
わたって金属光沢が得られ、打抜き性が極めて優れた方
向性電磁鋼板を得ることを目的とする。The present invention, the influence of the oxide film forming conditions up to the decarburization annealing step,
An object of the present invention is to obtain a grain-oriented electrical steel sheet which can obtain a metallic luster over the entire surface of the steel sheet and has an excellent punching property regardless of the physical properties of the annealing separator MgO.
（課題を解決するための手段） 本発明の要旨とするところは、最終板厚に冷間圧延され
た方向性電磁鋼板を脱炭焼鈍し、焼鈍分離剤を塗布し仕
上焼鈍する方向性電磁鋼板の製造方法において、マグネ
シア１００重量部に対して、アルカリ金属またはアルカ
リ土類金属の硫化物、多硫化物、水酸化物、硝酸塩、リ
ン酸塩、炭酸塩の１種または２種以上を１〜４０重量部
配合した焼鈍分離剤を塗布し仕上焼鈍する、さらに必要
に応じて、無機系コーティング剤を塗布しまたは塗布せ
ず平坦化焼鈍し、有機系或いは半有機系コーティング剤
を施すことを特徴とする打抜き性の優れた金属光沢を有
する方向性電磁鋼板の製造方法にある。(Means for Solving the Problem) The gist of the present invention is that a grain-oriented electrical steel sheet cold-rolled to a final sheet thickness is decarburized and annealed, and an annealing separator is applied to finish-anneal the grain-oriented electrical steel sheet. In the method for producing, 1 to 2 parts by weight of one or more of alkali metal or alkaline earth metal sulfides, polysulfides, hydroxides, nitrates, phosphates, carbonates are added to 100 parts by weight of magnesia. Characterized by applying 40 parts by weight of an annealing separating agent and finish annealing, and if necessary, applying an inorganic coating agent or flattening annealing without coating, and applying an organic or semi-organic coating agent. And a method for producing a grain-oriented electrical steel sheet having a metallic luster excellent in punching property.
以下に本発明ついて詳細に説明する。The present invention will be described in detail below.
本発明においては、鋼成分の特定および脱炭焼鈍し焼鈍
分離剤を塗布するまでの工程条件の特定は必要ではなく
任意である。脱炭焼鈍後は焼鈍分離剤を塗布し仕上焼鈍
するが、焼鈍分離剤には、脱炭焼鈍に際して鋼板表面に
生成した酸化膜中のSiO2と焼鈍分離剤中のMgOの反応を
阻止するような物質が配合される。In the present invention, the specification of the steel components and the specification of the process conditions until the decarburization annealing and the application of the annealing separator are not necessary and optional. After the decarburization annealing is annealed finish and coated with an annealing separating agent, but annealing the separating agent, to prevent the reaction of MgO in the SiO 2 and annealing separator of oxide film generated on the surface of the steel sheet during decarburization annealing Various substances are mixed.
焼鈍分離剤は仕上焼鈍で鋼板の焼付防止とともに、鋼板
中不純物を除き磁気特性を高めるためにMgOを用いる
が、該MgOは酸化膜中のSiO2と反応し、グラス被膜を形
成しようとする。これを防ぐように、Li,Na,Kなどのア
ルカリ金属またはCa,Ba,Mg,Srなどのアルカリ土類金属
の硫化物、多硫化物、水酸化物、硝酸塩、リン酸塩、炭
酸塩の１種または２種以上を焼鈍分離剤に配合する。As the annealing separator, MgO is used for finishing annealing to prevent seizure of the steel sheet and to remove impurities in the steel sheet to enhance the magnetic properties. The MgO reacts with SiO 2 in the oxide film to form a glass film. To prevent this, the sulfides, polysulfides, hydroxides, nitrates, phosphates, carbonates of alkali metals such as Li, Na, K or alkaline earth metals such as Ca, Ba, Mg, Sr One kind or two or more kinds are mixed with the annealing separator.
これら配合剤は仕上焼鈍の昇温過程において鋼板表面に
生成された酸化膜内に入り込みSiO2とMgOとの反応を抑
制しグラス被膜形成を阻止する。この作用効果を奏せし
めるには焼鈍分離剤中のMgO１００重量部に対して１重
量部以上必要である。一方、配合量が多くなると、鋼板
表面から荒らされたり、結晶粒界への侵入などにより、
磁気特性や加工性を劣化させるので、４０重量部以下と
する。These compounding agents enter into the oxide film formed on the surface of the steel sheet during the temperature rising process of finish annealing and suppress the reaction between SiO 2 and MgO and prevent the formation of glass film. In order to exert this effect, 1 part by weight or more is necessary for 100 parts by weight of MgO in the annealing separator. On the other hand, when the compounding amount is large, the surface of the steel sheet is roughened, or it enters the crystal grain boundary.
Since the magnetic properties and workability are deteriorated, the amount is 40 parts by weight or less.
前記配合剤を添加された焼鈍分離剤は脱炭焼鈍された鋼
板に塗布されるが、この塗布にあたってはスラリー状或
いは、静電塗装にて行われる。The annealing separator added with the compounding agent is applied to the decarburized and annealed steel sheet, and the application is performed in the form of slurry or electrostatic coating.
焼鈍分離剤を鋼板に塗布後、仕上焼鈍される。この際、
鋼板表面の酸化膜に部分的な差異例えば板両側部が他よ
り厚く、鋼板コイルの先端部や後端部が厚くなっていて
も、酸化膜自体がグラス被膜形成機能をなくされている
ので、鋼板全面にわたってグラス被膜が生ぜず金属光沢
面となる。このため、打抜き性が極めて優れたものとな
る。After the annealing separator is applied to the steel sheet, finish annealing is performed. On this occasion,
Partial difference in the oxide film on the surface of the steel plate, for example, both sides of the plate are thicker than the other, even if the front end and the rear end of the steel plate coil are thick, the oxide film itself has no glass film forming function, A glass coating does not occur on the entire surface of the steel sheet, and the surface becomes a metallic luster. Therefore, the punching property becomes extremely excellent.
仕上焼鈍後に平坦化焼鈍する際に、金属光沢鋼板表面に
無機系コーティング剤、例えばリン酸、リン酸アルミニ
ウム、リン酸マグネシウム等のリン酸塩、クロム酸、ク
ロム酸アルミニウム、クロム酸マグネシウム等のクロム
酸塩、重クロム酸塩、コロイダルシリカの１種または２
種以上を塗布して平坦化焼鈍するか、或いは、無機系コ
ーティング剤を塗布せずに行う。無機系コーティング剤
を塗布した場合には雰囲気ガスの如何にかかわらず全く
酸化しない利点がある。また、平坦化焼鈍後、有機系コ
ーティング剤、例えばアクリル系、スチレン、ポリビニ
ール、メラミン、フェノール、酢酸ビニール、エポキシ
系コーティング剤等を塗布し焼付ける。半有機系コーテ
ィング剤を用いることもでき、何れの場合でも打抜き性
が一段と優れたものとなる。When performing flattening annealing after finish annealing, an inorganic coating agent on the surface of the metallic luster steel sheet, for example, phosphoric acid, aluminum phosphate, phosphates such as magnesium phosphate, chromic acid, aluminum chromate, magnesium chromate and other chromium. 1 type of acid salt, dichromate, colloidal silica or 2
It is performed by applying at least one kind of seeds and flattening annealing, or without applying an inorganic coating agent. When the inorganic coating agent is applied, there is an advantage that it is not oxidized at all regardless of atmospheric gas. After the flattening annealing, an organic coating agent such as acrylic, styrene, polyvinyl, melamine, phenol, vinyl acetate or epoxy coating agent is applied and baked. It is also possible to use a semi-organic coating agent, and in any case, the punchability is further improved.
以下、実施例について述べる。Examples will be described below.
〈実施例１〉 Ｃ；0.050％、Si；3.13％、Mu；0.062％、Ｓ；0.024
％、残部が鉄および不可避不純物からなる方向性電磁鋼
板スラブを公知の方法によって熱延し、９８０℃×３分
間の中間焼鈍をはさんで２回の冷間圧延を行って最終板
厚0.35mmの冷間板とした。<Example 1> C: 0.050%, Si: 3.13%, Mu: 0.062%, S: 0.024
%, The balance of the grain-oriented electrical steel sheet slab consisting of iron and unavoidable impurities is hot-rolled by a known method, and cold-rolled twice by intermediate annealing at 980 ° C. for 3 minutes to obtain a final sheet thickness of 0.35 mm. Cold plate.
この鋼板をN2+H2,PH2O/PH2＝0.48の雰囲気ガス中で脱炭
焼鈍した後、焼鈍分離剤として表１に示す組成の分離剤
を塗布し、1200℃，２０hrの最終仕上焼鈍を行った。こ
の後、リン酸Al＋コロイド状シリカ系のコーティング液
を塗布し、平坦化焼鈍をかねて焼付を行った。This steel sheet was decarburized and annealed in an atmosphere gas of N 2 + H 2 , PH 2 O / PH 2 = 0.48, and then a separating agent having the composition shown in Table 1 was applied as an annealing separating agent, and the final temperature was 1200 ° C for 20 hours. Finish annealing was performed. After that, a coating solution of Al phosphate + colloidal silica was applied, and baking was performed while also performing flattening annealing.
得られた各試験材の外観、打抜性、磁気特性について調
査した結果を表２に示す。Table 2 shows the results of an examination of the appearance, punchability and magnetic properties of each of the obtained test materials.
〈実施例２〉 実施例１と同様にして調整した最終板厚0.35mmの冷延板
をN2+H2,PH2O/PH2＝0.42の雰囲気条件で脱炭焼鈍し、焼
鈍分離剤として表３に示す組成の分離剤を塗布後、1200
℃×２０hrの最終仕上焼鈍を行った。この後平坦化焼鈍
するに際し、１次被膜として実施例１と同様のコーティ
ング液を塗布後、２次被膜としてアクリルエマルジョン
樹脂を主成分とする半有機コーティング剤を塗布し、焼
付処理を行った。得られた成品板の特性を表４に示す。 Example 2 A cold-rolled sheet having a final sheet thickness of 0.35 mm prepared in the same manner as in Example 1 was decarburized and annealed under an atmosphere condition of N 2 + H 2 , PH 2 O / PH 2 = 0.42, and an annealing separator was used. After applying the separating agent having the composition shown in Table 3 above,
Final finishing annealing was performed at ℃ × 20hr. After this, in the flattening annealing, the same coating solution as in Example 1 was applied as a primary coating, and then a semi-organic coating agent containing an acrylic emulsion resin as a main component was applied as a secondary coating, followed by baking treatment. Table 4 shows the properties of the obtained product plate.
（発明の効果） 以上のように本発明によれば、グラス被膜形成が防止さ
れ、全面にわたって金属光沢を呈し、打抜き性が格段に
優れた方向性電磁鋼板が、脱炭焼鈍条件の微妙な変動に
よる影響をうけることなしに製造され得る。 (Effect of the Invention) As described above, according to the present invention, a grain-oriented electrical steel sheet in which formation of a glass coating film is prevented, a metallic luster is exhibited over the entire surface, and punching property is remarkably excellent, is a slight variation in decarburization annealing conditions. Can be manufactured without being affected by.
Claims (2)
を脱炭焼鈍し、焼鈍分離剤を塗布し仕上焼鈍する方向性
電磁鋼板の製造方法において、マグネシア１００重量部
に対して、アルカリ金属またはアルカリ土類金属の硫化
物、多硫化物、水酸化物、硝酸塩、リン酸塩、炭酸塩の
１種または２種以上を１〜４０重量部配合した焼鈍分離
剤を塗布し仕上焼鈍することを特徴とする打抜き性の優
れた金属光沢を有する方向性電磁鋼板の製造方法。1. A method for producing a grain-oriented electrical steel sheet, comprising: decarburizing-annealing a grain-oriented electrical steel sheet cold-rolled to a final thickness, applying an annealing separating agent, and finish annealing; Finish annealing by applying an annealing separator containing 1 to 40 parts by weight of one or more of sulfides, polysulfides, hydroxides, nitrates, phosphates and carbonates of alkali metals or alkaline earth metals. A method for producing a grain-oriented electrical steel sheet having a metallic luster with excellent punching properties.
を脱炭焼鈍し、焼鈍分離剤を塗布し仕上焼鈍する方向性
電磁鋼板の製造方法において、マグネシア１００重量部
に対して、アルカリ金属またはアルカリ土類金属の硫化
物、多硫化物、水酸化物、硝酸塩、リン酸塩、炭酸塩の
１種または２種以上を１〜４０重量部配合した焼鈍分離
剤を塗布し仕上焼鈍し、次いで、無機系コーティング剤
を塗布しまたは塗布せず平坦化焼鈍し、有機系或いは半
有機系コーティング剤を施すことを特徴とする打抜き性
の優れた金属光沢を有する方向性電磁鋼板の製造方法。2. A method for producing a grain-oriented electrical steel sheet, comprising: decarburizing-annealing a grain-oriented electrical steel sheet cold-rolled to a final thickness, applying an annealing separating agent, and finish annealing; Finish annealing by applying an annealing separator containing 1 to 40 parts by weight of one or more of sulfides, polysulfides, hydroxides, nitrates, phosphates and carbonates of alkali metals or alkaline earth metals. Then, the production of a grain-oriented electrical steel sheet having a metallic luster with excellent punching properties, characterized by applying an inorganic coating agent or flattening annealing without coating, and applying an organic or semi-organic coating agent. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63260570A JPH0649948B2 (en) | 1988-10-18 | 1988-10-18 | Method for producing grain-oriented electrical steel sheet having metallic luster excellent in punching property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63260570A JPH0649948B2 (en) | 1988-10-18 | 1988-10-18 | Method for producing grain-oriented electrical steel sheet having metallic luster excellent in punching property |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02107782A JPH02107782A (en) | 1990-04-19 |
| JPH0649948B2 true JPH0649948B2 (en) | 1994-06-29 |
Family
ID=17349785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63260570A Expired - Fee Related JPH0649948B2 (en) | 1988-10-18 | 1988-10-18 | Method for producing grain-oriented electrical steel sheet having metallic luster excellent in punching property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649948B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843466B2 (en) * | 1979-06-07 | 1983-09-27 | 新日本製鐵株式会社 | Annealing separator for unidirectional silicon steel sheets |
| JPS5844152A (en) * | 1981-09-10 | 1983-03-15 | 日本設備コア株式会社 | plastic tiles |
-
1988
- 1988-10-18 JP JP63260570A patent/JPH0649948B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02107782A (en) | 1990-04-19 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |