JPH04137322A - Iron for forming hot iron - Google Patents

Iron for forming hot iron

Info

Publication number
JPH04137322A
JPH04137322A JP25816390A JP25816390A JPH04137322A JP H04137322 A JPH04137322 A JP H04137322A JP 25816390 A JP25816390 A JP 25816390A JP 25816390 A JP25816390 A JP 25816390A JP H04137322 A JPH04137322 A JP H04137322A
Authority
JP
Japan
Prior art keywords
vanadium
iron
coating layer
carbide
trowel
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
Application number
JP25816390A
Other languages
Japanese (ja)
Inventor
Isamu Matsui
勇 松井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to JP25816390A priority Critical patent/JPH04137322A/en
Publication of JPH04137322A publication Critical patent/JPH04137322A/en
Pending legal-status Critical Current

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  • Moulds, Cores, Or Mandrels (AREA)
  • Insulating Bodies (AREA)

Abstract

PURPOSE:To elongate life the of an iron even under a hard and poor using condition by forming, an iron body of a ductile cast iron or a steel of specific content ratio of carbon and forming vanadium-carbide-coating layer on the outer surface. CONSTITUTION:An iron body 1 is made of ductile cast iron or steel, of content ratio of carbon 0.5% or more. This material includes scattered granular graphite, and possesses hardness of about HB230. A vanadium-carbide-coating layer 2 is formed on the outer surface of the iron body 1. This layer 2 is formed by dipping the iron body 1 into molten boron mixed with vanadium and then by quenching and tempering. As a result, vanadium, molten into the base material of the iron body 1, is diffused, then carbon and vanadium contained in ductile cast iron, etc., of a base material, are chemically bonded to construct vanadium carbide, so as to form the rigid vanadium-carbide-coating layer 2, on the surface of the iron body 1.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は懸垂碍子のような陶磁器類を焼鏝成形法により
成形するために使用される焼鏝成形用鏝に関するもので
ある。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a trowel forming trowel used for molding ceramics such as suspended insulators by the sintering trowel forming method.

(従来の技術) 懸垂碍子は、坏土を型に入れ高温に加熱された回転する
丸鏝によりプレス成形する焼鏝成形法によって成形され
ている。このような焼鏝成形に使用される従来の焼鏝成
形用鏝は、主としてねずみ鋳鉄のような片状黒鉛鋳鉄に
より構成されており、水分を含有する坏土との接触時に
水蒸気を発生して滑らかな成形面を得るものである。
(Prior Art) Suspended insulators are formed by a firing trowel forming method in which clay is placed in a mold and press-formed using a rotating round trowel heated to a high temperature. Conventional trowels for forming sintering irons are mainly made of flaky graphite cast iron such as gray cast iron, and when they come into contact with clay containing moisture, they generate water vapor. This provides a smooth molding surface.

ところが、近年では次工程の乾燥時間の短縮を目的とし
て坏土の水分が従来の25%から20%へと次第に低水
化されており、これにつれて成形すべき坏土が硬くなり
つつある。そのうえこのような焼鏝成形用鏝はバーナー
直火により加熱されるため、鏝の摩耗が増大する傾向に
ある。この結果、現状ではこの種の鏝の寿命は成形数で
5000個が限度であり、寿命に達した鏝は一度表面形
状を修正して再使用するが、延べ10000個の成形を
行うと廃棄処分されており、生産管理上や品質の安定上
で大きい問題が残されていた。
However, in recent years, the moisture content of clay has been gradually lowered from 25% to 20% in order to shorten the drying time in the next step, and as a result, the clay to be molded has become harder. Moreover, since such a trowel for forming a sintering trowel is heated by direct flame of a burner, wear of the trowel tends to increase. As a result, the lifespan of this type of trowel is currently limited to 5,000 moldings, and once the trowel reaches the end of its life, the surface shape is corrected and reused, but once a total of 10,000 molds have been formed, it is discarded. However, major problems remained in terms of production control and quality stability.

(発明が解決しようとする課題) 本発明は上記したような従来の問題点を解消して、坏土
の低水化やバーナー直火による加熱のような劣悪な使用
条件下でも寿命を飛躍的に同上させることができる焼鏝
成形用鏝を提供するために完成されたものである。
(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and dramatically extends the service life even under poor usage conditions such as low water content of clay and heating with direct burner. This was completed in order to provide a trowel for forming a sintering trowel, which can be used in the same manner as above.

(課題を解決するための手段) 上記の課題を解決するためになされた本発明は、焼鏝成
形用の種本体をカーボンの含有率が0.5%以上のダク
タイル鋳鉄又は鋼鉄により形成するとともに、その外表
面にバナジウム−カーバイドコーティング層を形成した
ことを特徴とするものである。
(Means for Solving the Problems) The present invention, which has been made to solve the above problems, includes forming a seed body for molding a baking iron from ductile cast iron or steel having a carbon content of 0.5% or more. , which is characterized by having a vanadium-carbide coating layer formed on its outer surface.

以下に図示の実施例を参照しつつ、本発明を更に詳細に
説明する。
The invention will be explained in more detail below with reference to the illustrated embodiments.

(実施例) 第1図において、(1)は焼鏝成形用の種本体であり、
回転させながら成形する丸鏝成形を行うために中央の垂
直軸を中心とした回転対称体となっている。この種本体
(1)は実施例ではカーボンの含有率が0.52〜0.
55%のダクタイル鋳鉄(FCD−40)を使用してい
る。この材料は黒鉛が粒状に散在しており、HB 23
0程度の硬度を持つものである。
(Example) In FIG. 1, (1) is a seed body for molding a baking iron,
It is a rotationally symmetrical body around a central vertical axis in order to perform round trowel molding, which is performed while rotating. In the examples, this type of main body (1) has a carbon content of 0.52 to 0.
55% ductile cast iron (FCD-40) is used. This material has graphite scattered in granular form and has HB 23
It has a hardness of about 0.

しかし種本体(1)の材料としてはこの外、カーボンの
含有率が0.52〜0.55%の炭素鋼、カーボンの含
有率が0.8〜0.9%の合金工具鋼、カーボンの含有
率が1.4〜1.6%の耐摩不変形合金工具鋼等の鋼鉄
を使用することもできる。いずれにしても種本体(1)
の材料は片状黒鉛がな(、バナジウムカーバイドコーテ
ィング層を強固に形成するためにカーボンの含有率が0
45%以上であることが必要である。
However, the material for the seed body (1) may also include carbon steel with a carbon content of 0.52 to 0.55%, alloy tool steel with a carbon content of 0.8 to 0.9%, and carbon steel with a carbon content of 0.8 to 0.9%. It is also possible to use steels such as wear-resistant, non-deformable alloy tool steels with a content of 1.4-1.6%. In any case, the seed itself (1)
The material is flaky graphite (carbon content is 0 to form a strong vanadium carbide coating layer).
It is necessary that it is 45% or more.

本発明においては、このような種本体(1)の外表面に
バナジウム−カーバイドコーティング層(2)を形成し
である。このコーティング層はバナジウムを混入した8
00〜1050°Cの溶融硼素中に種本体(1)を浸漬
し、1時間〜10時間浸漬保持後、焼入れ、焼もどしを
し形成されるものである。この結果、種本体(1)の母
材中に溶融したバナジウムが拡散浸透し、母材のダクタ
イル鋳鉄等に含まれているカーボンとバナジウムとが化
学的に結合してバナジウム炭化物を構成し、種本体(1
)の表面に強固なバナジウム−カーバイドコーティング
層(2)を形成するものである。
In the present invention, a vanadium-carbide coating layer (2) is formed on the outer surface of such a seed body (1). This coating layer contains vanadium-containing 8
The seed body (1) is immersed in molten boron at 00 to 1050°C, kept immersed for 1 to 10 hours, and then quenched and tempered. As a result, the molten vanadium diffuses into the base material of the seed body (1), and the carbon contained in the base material, such as ductile cast iron, and vanadium chemically combine to form vanadium carbide. Main body (1
) to form a strong vanadium-carbide coating layer (2) on the surface.

得られたバナジウム−カーバイドコーティング層(2)
は、約HB 3500程度の極めて大きい硬度を持つも
のであり、耐摩耗性に優れるうえ摩擦係数が小さいもの
である。また得られたバナジウム−カーバイドコーティ
ング層(2)は母材と化学結合しているために耐剥離性
に優れるとともに、化学的に除去して何度でもコーティ
ング処理を行うこともできる。更にこのコーティング層
(2)は種本体(1)の形状に無関係に、全表面に均一
に被覆することができる利点を持つ。
Obtained vanadium-carbide coating layer (2)
has extremely high hardness of approximately HB 3500, has excellent wear resistance, and has a small coefficient of friction. Furthermore, since the obtained vanadium-carbide coating layer (2) is chemically bonded to the base material, it has excellent peeling resistance and can be chemically removed and coated any number of times. Furthermore, this coating layer (2) has the advantage that the entire surface of the seed body (1) can be uniformly coated, regardless of the shape of the seed body (1).

なお、従来のように種本体(1)を片状黒鉛鋳鉄により
構成したときは、その表面にバナジウム−カーバイドコ
ーティング層(2)を形成する度に次第に内部の片状黒
鉛が成長し、ついにはバナジウムカーバイドコーティン
グ層(2)自体にクラックを生ずるおそれがある。これ
に比較して本発明のように種本体(1)にダクタイル鋳
鉄又は鋼鉄を使用すれば、片状黒鉛の成長がないので1
0回以上繰り返してバナジウム−カーバイドコーティン
グを行うことができる。
In addition, when the seed body (1) is made of flaky graphite cast iron as in the past, each time a vanadium-carbide coating layer (2) is formed on its surface, the flaky graphite inside gradually grows, and eventually There is a risk that cracks may occur in the vanadium carbide coating layer (2) itself. In comparison, if ductile cast iron or steel is used for the seed body (1) as in the present invention, there is no growth of flaky graphite, so 1
The vanadium-carbide coating can be applied zero or more times.

以上に述べたバナジウム−カーバイドコーティングN(
2)の膜厚は第1回目のコーティングでは7゜5μ−程
度であるが、10回程度繰り返すとその膜厚は20μl
程度となる。
Vanadium-carbide coating N (
The film thickness of 2) is about 7゜5μ- in the first coating, but after repeating it about 10 times, the film thickness becomes 20μl.
It will be about.

(作用) このように構成された本発明の焼鏝成形用鏝は、その表
面をバーナー直火によって加熱され、中心軸の回りに回
転させつつ型の内部の坏土をプレス成形するために使用
されることは従来の焼鏝成形用鏝と同様である。
(Function) The trowel for forming a sintering trowel of the present invention configured as described above has its surface heated by direct flame of a burner, and is used for press-molding the clay inside the mold while rotating around the central axis. What is done is the same as with a conventional trowel for forming a sintering iron.

しかし本発明においては、種本体(1)をカーボンの含
有率が0.5%以上のダクタイル鋳鉄又は鋼鉄により形
成するとともに、その外表面にバナジウム−カーバイド
コーティング層(2)を形成しであるので、コーティン
グ層と母材との結合力が大きく、またコーティング層自
体の硬度がその他一般のコーティング層に比較してはる
かに大きいので耐摩耗性に優れたものとなる。このため
、坏土の低水化やバーナー直火による加熱のような劣悪
な使用条件下でも鏝の表面形状が変化せず、連続して2
0000個の懸垂碍子の成形が可能である。しかも20
000個を成形した後は化学的にバナジウム−カーバイ
ドコーティング層(2)を除去し、再度コーティングを
繰り返すことにより、20万個までの成形が可能であり
、焼鏝成形用鏝の寿命を従来の1万個に比較して20倍
にも伸ばすことが可能である。
However, in the present invention, the seed body (1) is formed of ductile cast iron or steel with a carbon content of 0.5% or more, and a vanadium-carbide coating layer (2) is formed on its outer surface. Since the bonding force between the coating layer and the base material is large, and the hardness of the coating layer itself is much greater than that of other general coating layers, it has excellent wear resistance. For this reason, the surface shape of the trowel does not change even under poor usage conditions such as low water content of clay or heating with direct burner, and the surface shape of the trowel does not change continuously.
It is possible to mold up to 0,000 suspended insulators. And 20
After molding 000 pieces, by chemically removing the vanadium-carbide coating layer (2) and repeating the coating, it is possible to mold up to 200,000 pieces. Compared to 10,000 pieces, it is possible to increase the number by 20 times.

そしてこのようにコーティングを繰り返えしても、鏝本
体(1)をダクタイル鋳鉄又は鋼鉄により構成したので
、片状黒鉛の成長がなくバナジウム−カーバイドコーテ
ィング層(2)の剥離等のおそれはない。
Even if the coating is repeated in this way, since the iron body (1) is made of ductile cast iron or steel, there is no growth of flaky graphite and there is no risk of peeling of the vanadium-carbide coating layer (2). .

(発明の効果) 以上に説明したように、本発明の焼鏝成形用鏝は坏土の
低水化やバーナー直火による加熱のような劣悪な使用条
件においても摩耗が少ないうえに剥離や亀裂の発生のお
それがなく、使用寿命を従来の鏝に比較して飛躍的に向
上させることができる。
(Effects of the Invention) As explained above, the trowel for forming a sintering trowel of the present invention has less wear and peeling and cracking even under poor usage conditions such as low water content of clay and heating with direct burner. There is no risk of this occurring, and the service life can be dramatically improved compared to conventional trowels.

よって本発明は従来の問題点を一掃した焼鏝成形用鏝と
して、産業の発展に寄与するところはきわめて大きいも
のがある。
Therefore, the present invention can greatly contribute to the development of industry as a trowel for forming a sintering iron that eliminates the problems of the conventional technology.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例を示す部分断面図である。 (1): 鏝本体、 (2):バナジウム カーハイ ドコー ティング層。 FIG. 1 is a partial sectional view showing an embodiment of the present invention. (1): Trowel body, (2): Vanadium car high doco ting layer.

Claims (1)

【特許請求の範囲】[Claims] 焼鏝成形用の鏝本体(1)をカーボンの含有率が0.5
%以上のダクタイル鋳鉄又は鋼鉄により形成するととも
に、その外表面にバナジウム−カーバイドコーティング
層(2)を形成したことを特徴とする焼鏝成形用鏝。
The trowel body (1) for sintering iron molding has a carbon content of 0.5.
% or more of ductile cast iron or steel, and has a vanadium-carbide coating layer (2) formed on its outer surface.
JP25816390A 1990-09-26 1990-09-26 Iron for forming hot iron Pending JPH04137322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25816390A JPH04137322A (en) 1990-09-26 1990-09-26 Iron for forming hot iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25816390A JPH04137322A (en) 1990-09-26 1990-09-26 Iron for forming hot iron

Publications (1)

Publication Number Publication Date
JPH04137322A true JPH04137322A (en) 1992-05-12

Family

ID=17316410

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25816390A Pending JPH04137322A (en) 1990-09-26 1990-09-26 Iron for forming hot iron

Country Status (1)

Country Link
JP (1) JPH04137322A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103898446A (en) * 2012-12-26 2014-07-02 中国科学院宁波材料技术与工程研究所 Ceramic/metal nano composite VC-Ni toughened coating and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63216704A (en) * 1987-03-04 1988-09-09 日本碍子株式会社 Rotary iron for molding pottery

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63216704A (en) * 1987-03-04 1988-09-09 日本碍子株式会社 Rotary iron for molding pottery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103898446A (en) * 2012-12-26 2014-07-02 中国科学院宁波材料技术与工程研究所 Ceramic/metal nano composite VC-Ni toughened coating and preparation method thereof
CN103898446B (en) * 2012-12-26 2016-06-08 中国科学院宁波材料技术与工程研究所 Toughness reinforcing coating of the nano combined VC-Ni of ceramic/metal and preparation method thereof

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