JPH0532033A - Seal - Google Patents

Abstract

PURPOSE:To provide a seal susceptible to precise printing processing, excellent in abrasion resistance and corrosion resistance and showing a gold or silver color by applying stamping processing to a sintered alloy based on TiN or TiC and having a mean crystal particle size of a specific value or less and a specific range of voids after baking. CONSTITUTION:A molded body based on TiN or TiC is heated and baked under vacuum by a hot press or HIP to form a golden or silver-colored sintered alloy which is, in turn, used to prepare the part containing at least a printing surface of a seal. By setting the mean crystal particle size of the sintered alloy to 3mum or less, the sintered alloy is improved in the spread of red seal-ink and made hard to damage and, by setting the voids of the sintered alloy to 0.3-5%, the stress acting on one particle is reduced and the separation of particles is suppressed. After baking, stamping processing due to a blasting method, a Honing method, a water jet method, a laser beam method or a discharge processing method is applied to the sintered alloy to prepare a seal excellent in printability.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は印鑑に関し、特に高強度
でかつ加工性に優れ、耐腐食性・耐摩耗性・装飾性を高
めた印鑑に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal stamp, and more particularly to a seal stamp having high strength, excellent workability, and improved corrosion resistance, abrasion resistance and decorativeness.

【０００２】[0002]

【従来の技術】従来、印鑑は証明用実印等への使用を目
的に、水牛・木・水晶・象牙等の高級天然材が多く用い
られてきた。しかし、これらは硬度が低く印字面及び表
面に傷・割れを生じやすい上、摩耗しやすく長期の使用
に耐えられないという問題があった。また、ワシントン
条約での象牙輸入禁止など、これらの天然材は希少資源
として入手困難に成りつつある。2. Description of the Related Art Conventionally, high-quality natural materials such as buffalo, wood, crystal, and ivory have been widely used for seals for the purpose of using them for certification official seals. However, these have a problem that they have low hardness and are easily scratched or cracked on the printed surface and surface, and they are easily worn and cannot withstand long-term use. Also, due to the ban on ivory imports under the CITES, these natural materials are becoming difficult to obtain as rare resources.

【０００３】そこで、近年セラミックスの印鑑が用いら
れるようになった。これらは耐熱性・高強度を有する
為、耐久性は優れる反面、加工工程上の制約もある。例
えば、特開昭６０−１３１８６１号、６１−９７１６４
号公報においては焼成前のセラミックス成形体に切削加
工を施して刻印した後焼結させる方法が、特開平２−２
１２２５７号公報では仮焼体に印字加工後、本焼成させ
る方法がそれぞれ開示されている。また、特開平２−５
２５５０号公報においてはガラスセラミックス素材に彫
刀する例が開示されている。Therefore, in recent years, a ceramic seal stamp has been used. Since these have heat resistance and high strength, they have excellent durability, but also have restrictions in the processing process. For example, JP-A-60-131861, 61-97164
In Japanese Unexamined Patent Publication No. 2-2, there is disclosed a method in which a ceramic molded body before firing is subjected to cutting work, stamped and then sintered.
In Japanese Patent No. 12257, there is disclosed a method in which a calcined body is printed and then main-baked. In addition, Japanese Patent Laid-Open No. 2-5
Japanese Patent No. 2550 discloses an example of engraving on a glass ceramic material.

【０００４】[0004]

【発明が解決しようとする課題】ところが、上記のセラ
ミックス製印鑑では、焼成前に刻印していたため、文字
・形状が崩れやすく、また焼結後の印字部変形、クラッ
ク発生等の問題があり、印鑑としての基本特性を満たせ
ないことがあった。However, in the above-mentioned ceramics stamp, since the marking is performed before firing, the characters and shapes are likely to collapse, and there are problems such as deformation of the printed part after sintering and cracking. In some cases, the basic characteristics as a seal were not satisfied.

【０００５】また、金色・銀色印鑑を求める市場要求に
対し、上記セラミックス製印鑑では、象牙色風合いのも
のは可能であるが、金・銀色を呈しかつ実用に供するも
のはなかった。そこで本発明の課題は上記の問題を解決
し，市場要求を満たすために精密印字加工が可能で耐摩
耗性・耐腐食性に優れ、金・銀色を呈する高強度の焼結
合金製印鑑を提供することにある。In response to the market demand for gold / silver seals, the above-mentioned ceramics seals can have an ivory color texture, but none of them exhibit gold / silver colors and are practically used. Therefore, an object of the present invention is to solve the above problems and provide a high-strength sintered alloy seal stamp that can perform precision printing processing to meet market demand, has excellent wear resistance and corrosion resistance, and exhibits gold and silver colors. To do.

【０００６】[0006]

【課題を解決するための手段】上記に鑑みて、本発明は
印鑑の少なくとも印字面を含む部分をＴｉＮまたはＴｉ
Ｃを主成分とし、平均結晶粒径が３μｍ以下、気孔率
０．３〜５％の焼結合金で構成したものである。In view of the above, according to the present invention, a portion of at least a print surface of a stamp is made of TiN or Ti.
It is composed of a sintered alloy containing C as a main component and having an average crystal grain size of 3 μm or less and a porosity of 0.3 to 5%.

【０００７】また、本発明の印鑑は、ＴｉＮ、ＴｉＣを
主成分とする成型体を焼成後、所定の面に刻印加工する
ことによって得られる。一般に、Ｔｉを含有する焼結合
金は高強度で優美な色を呈する反面、耐チッピング性に
劣るという欠点があった。そこで本発明では、シャープ
な印字面を得る為に、素材の改良を行いこれを解決し
た。The stamp of the present invention can be obtained by firing a molded body containing TiN or TiC as a main component, and then stamping it on a predetermined surface. Generally, a sintered alloy containing Ti has high strength and an excellent color, but has a drawback of being inferior in chipping resistance. Therefore, in the present invention, in order to obtain a sharp printed surface, the material is improved and solved.

【０００８】即ち、本発明の金色焼結合金は、Ｔｉが全
量中５５〜７５重量％、鉄族金属及び少なくともＣｒを
含む周期律表第６ａ族元素が全量中３〜２９重量％、残
部が非金属元素により構成されるとともに、Ｔｉを除く
金属元素中に於けるＣｒの割合を４０重量％以上として
なるものである。ここで鉄族金属にはＮｉをはじめＦ
ｅ、Ｃｏがあり、周期律表第６ａ族元素にはＣｒ、Ｍ
ｏ、Ｗがあり、非金属元素としては炭素（Ｃ）や窒素
（Ｎ）がある。That is, in the gold-colored sintered alloy of the present invention, Ti is 55 to 75% by weight, the iron group metal and Group 6a element containing at least Cr are 3 to 29% by weight, and the balance is the balance. It is composed of a non-metal element, and the proportion of Cr in the metal elements other than Ti is 40% by weight or more. Here, the iron group metals include Ni and F
e, Co, and elements 6a of the periodic table are Cr and M
There are o and W, and nonmetallic elements include carbon (C) and nitrogen (N).

【０００９】また、銀色焼結合金は、Ｔｉが全量中５５
重量％以上、Ｃｒ₃Ｃ₂ が１〜２０重量％及びＮｉ１〜
３０重量％としてなるものである。In the silver-colored sintered alloy, Ti is 55 in the total amount.
Wt% or more, Cr ₃ C ₂ is 1 to 20% by weight and Ni1~
It is to be 30% by weight.

【００１０】さらに、これらの焼結合金の焼成は、真空
加熱焼成のほかホットプレス、ＨＩＰ等により行い、気
孔率０．３〜５％の焼結体を得ることができる。この気
孔率を限定した理由として、気孔率０．３％以下である
と朱肉ののりが著しく低下して印材としての用途価値が
なくなり、一方気孔率５％を超えると本体そのものの強
度が低下し、例えば落下などにより破損の恐れが生じて
くるためである。また平均結晶粒径を３μｍ以下とする
ことにより、粒子１個当りに作用する応力を小さくし脱
粒の発生を抑えた。Further, firing of these sintered alloys is performed by hot pressing, HIP or the like in addition to vacuum heating and firing, and a sintered body having a porosity of 0.3 to 5% can be obtained. The reason for limiting the porosity is that when the porosity is 0.3% or less, the paste of the red meat is remarkably reduced to have no use value as a printing material, and when the porosity is more than 5%, the strength of the main body is deteriorated. This is because there is a risk of damage due to, for example, dropping. Further, by setting the average crystal grain size to 3 μm or less, the stress acting on each grain is reduced and the occurrence of shedding is suppressed.

【００１１】これらの創意工夫により色調はもとより、
強固でチッピングの発生のない良好な焼結合金を得るこ
とができた。With these ingenuity, not only the color tone,
It was possible to obtain a good sintered alloy that was strong and did not cause chipping.

【００１２】また、上記金色焼結合金に対する刻印の方
法は、ブラスト法、ホーニング法、ウォータージェット
法、レーザービーム法等の他、通電性を有するため放電
加工も可能である。The marking method for the gold-colored sintered alloy is not limited to blasting, honing, water jet, laser beam, etc., and electrical discharge machining is also possible because it has electrical conductivity.

【００１３】[0013]

【作用】本発明によれば耐摩耗性・耐腐食性が高く、か
つ優れた美観を有する印鑑を得ることができる。また刻
印方法も種々の方法が選択でき、低コストで加工でき
る。さらに、適度な気孔率を有しシャープエッジな加工
性と相まって印字性も向上する。According to the present invention, it is possible to obtain a stamp having high wear resistance and corrosion resistance and an excellent appearance. Also, various marking methods can be selected, and processing can be performed at low cost. Further, the printability is improved in combination with the sharp porosity and the appropriate porosity.

【００１４】[0014]

【実施例】実施例１ Ｔｉの窒化物および炭窒化物として粒径０．５〜３．０
μｍのＴｉＮおよびＴｉＣＮと、鉄族金属として粒径
０．１〜１．０μｍのＮｉやＣｏと、周期律表第６ａ族
元素として粒径１．０〜１０．０μｍのＷＣやＣｒ₃ Ｃ
₂ の各粉末を秤量混合し、これをアセトン等の有機溶媒
中で約６８時間混合粉砕した後、パラフィンを加え、
１．５ｔｏｎ／ｃｍ² の圧力で、直径１．０〜３．０ｃ
ｍ、長さ約５ｃｍの円柱状に加圧成形した。得られた成
形体を非酸化性雰囲気下において所定温度で脱バインダ
ーした後、真空加熱炉において所定温度で真空焼成を十
数時間行うことにより金色焼結合金を得た。なお、この
ときＷやＣｒは原料粉末として炭化物として添加した
が、焼成する過程において金属Ｗや金属Ｃｒとして結合
金属中に溶融したり、ＴｉＮやＴｉＣＮ中に固溶し、焼
結合金中にＷＣやＣｒ₂ Ｃ₃ の形では存在していない。
またＴｉＮやＴｉＣＮは、粒径１０μｍ以下の結晶粒子
として焼結合金中に存在することが望ましい。 Example 1 Particle size of 0.5 to 3.0 as Ti nitride and carbonitride
and TiN and TiCN of [mu] m, and Ni and Co of particle size 0.1~1.0μm as iron group metals, the particle size 1.0~10.0μm as periodic table 6a group element WC and Cr ₃ C
The respective powders of ₂ were weighed and mixed, and this was mixed and ground in an organic solvent such as acetone for about 68 hours, and then paraffin was added,
1.0 to 3.0c diameter at a pressure of 1.5 ton / cm ^2.
It was pressure-molded into a cylindrical column having a length of m and a length of about 5 cm. The obtained molded body was debindered at a predetermined temperature in a non-oxidizing atmosphere, and then vacuum fired at a predetermined temperature in a vacuum heating furnace for 10 hours to obtain a gold-colored sintered alloy. At this time, W and Cr were added as carbides as raw material powder, but they were melted in the binding metal as metal W or metal Cr in the process of firing or solid-solved in TiN or TiCN to form WC in the sintered alloy. And Cr ₂ C ₃ do not exist.
Further, TiN and TiCN are preferably present in the sintered alloy as crystal particles having a particle size of 10 μm or less.

【００１５】また、焼成条件は、真空度が１０^-1〜１０
^-4ｔｏｒｒの雰囲気や、非酸化性雰囲気中において減圧
または無加圧にて、温度１３００〜１８００℃で焼成す
る。焼成時間は製品の大きさにもよるが通常５〜１５時
間である。The firing condition is that the degree of vacuum is 10 ^-1 to 10
Baking at a temperature of 1300 to 1800 ° C under reduced pressure or no pressure in an atmosphere of ^-4 torr or a non-oxidizing atmosphere. The firing time is usually 5 to 15 hours, depending on the size of the product.

【００１６】この焼結体を外周研削後、バレル研磨仕上
げし、印字面を研削仕上げした後、この面をサンドブラ
スト法により刻印して本発明の印鑑を得た。After the outer periphery of this sintered body was ground, barrel finishing was carried out and the printed surface was finished by grinding, and this surface was stamped by the sand blast method to obtain the stamp of the present invention.

【００１７】このようにして得られた製品について、色
調・耐腐食性・落下強度を、また試験片を用いて抗折強
度・ビッカース硬度（Ｈｖ）・気孔率を測定した。抗折
強度の測定はＪＩＳＲ１６０１の３点曲げ試験法に従
い、ビッカース硬度の測定はＪＩＳＺ２２４４試験法に
従い、気孔率においてはアルキメデス法に従った。そし
て耐腐食性試験については、ＩＳＯ（国際標準化機構）
規格に則した人工汗（ｐｈ４．７）を腐食液として使用
し、温度４０℃±２℃に保持した人工汗中に鏡面研磨し
た試料の下半分を２４Ｈ浸漬し、浸した後の試料研磨面
の状況を観察することによりおこなった。また、各試料
につき、耐チッピング性および印字の際の朱肉付き性を
調べ、非常に良好（○）、良好（△）、不良（×）で評
価した。結果は表１に示す通りである。The color tone, corrosion resistance, and drop strength of the product thus obtained were measured, and the bending strength, Vickers hardness (Hv), and porosity were measured using test pieces. The bending strength was measured according to JIS R1601 three-point bending test method, the Vickers hardness was measured according to JIS Z2244 test method, and the porosity was measured according to Archimedes method. And for the corrosion resistance test, ISO (International Organization for Standardization)
The lower half of the mirror-polished sample was immersed in artificial sweat kept at a temperature of 40 ° C ± 2 ° C for 24H using artificial sweat (ph4.7) conforming to the standard as a corrosive liquid, and the sample polished surface after immersion It was done by observing the situation. Further, with respect to each sample, the chipping resistance and the redness at the time of printing were examined, and evaluated as very good (◯), good (Δ), and poor (x). The results are shown in Table 1.

【００１８】[0018]

【表１】 [Table 1]

【００１９】表１に示すように、Ｎｏ．１の試料は気孔
率が０．１％と小さいため、印字性が悪かった。一方Ｎ
ｏ．４、５の試料は気孔率が５％より大きいため抗折強
度が低く、耐チッピング性がわるかった。これに対し、
Ｎｏ．２、３のものは印字性、抗折強度ともに優れてい
た。したがって、気孔率は０．３〜５％のものが良いこ
とがわかる。As shown in Table 1, No. The sample No. 1 had a low porosity of 0.1%, and thus had poor printability. On the other hand, N
o. Samples Nos. 4 and 5 had a porosity of more than 5% and thus had a low bending strength and poor chipping resistance. In contrast,
No. A few of them had excellent printability and bending strength. Therefore, it is understood that the porosity of 0.3 to 5% is preferable.

【００２０】また、本発明による焼結合金の研磨面の色
調は、優美で鮮明な黄金色を呈し、著しく優れた装飾効
果を持つものであった。さらに、耐腐食性試験の結果は
非常に良好で変色・腐食とも認められなかった。また、
高さ１ｍからコンクリート・Ｐタイル上に落としても何
等異常はなかった。さらに、抗折強度は１２０ｋｇ／ｍ
ｍ² 以上、ビッカース硬度においては１２００ｋｇ／ｍ
ｍ² 以上で非常に高強度・高硬度を示した。The color tone of the polished surface of the sintered alloy according to the present invention was graceful and had a clear golden color, and had a remarkably excellent decorative effect. Furthermore, the result of the corrosion resistance test was very good, and neither discoloration nor corrosion was observed. Also,
When dropped from a height of 1 m onto concrete / P tile, there was no abnormality. Furthermore, the bending strength is 120 kg / m
m ² or more, 1200 kg / m in Vickers hardness
It showed extremely high strength and hardness at m ² or more.

【００２１】[0021]

【発明の効果】このように、本発明によれば、印鑑の少
なくとも印字面を含む部分をＴｉＮまたはＴｉＣを主成
分とし、平均結晶粒径が３μｍ以下、気孔率０．３〜５
％の焼結合金で構成したことによって、鮮明で優美な金
・銀色の鏡面が容易に現出するとともに、優れた強度、
耐チッピング性を有するため、シャープエッジ加工を容
易に行うことができ、さらに朱肉ののりがよく、長期に
わたり腐食やきずが発生しないなどの優れた特長をもっ
た印鑑を提供することができる。As described above, according to the present invention, at least the printing surface of the stamp has TiN or TiC as the main component, the average crystal grain size is 3 μm or less, and the porosity is 0.3 to 5.
% Composed of a sintered alloy, a clear and elegant gold / silver-colored mirror surface can be easily revealed, and excellent strength,
Since it has chipping resistance, it is possible to easily provide sharp edge processing, and it is possible to provide a seal stamp having excellent features such as good porcelain paste and no corrosion or flaws for a long period of time.

Claims (1)

【特許請求の範囲】 【請求項１】ＴｉＮまたはＴｉＣを主成分とし、平均結
晶粒径が３μｍ以下、気孔率０．３〜５％の焼結合金か
らなることを特徴とする印鑑。Claims: 1. A seal stamp comprising a sintered alloy containing TiN or TiC as a main component and having an average crystal grain size of 3 μm or less and a porosity of 0.3 to 5%.