JPS62133080A - Surface hardening treatment of soft magnetic precision parts - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a material to be treated without losing the magnetic characteristics by subjecting the material to annealing in vacuum, specified pretreatment for plating and electroless chemical Ni-B plating. CONSTITUTION:Precision parts made of soft magnetic silicon steel are annealed in vacuum so as to obtain desired magnetic characteristics and to prevent the formation of oxide films on the surfaces. The parts are pretreated by degreasing with an org. solvent, degreasing with alkali, pickling and treatment for removing silicon oxide with a mixed acid-inhibitor soln. The parts are then subjected to electroless chemical Ni-B plating.

Description

Translated fromJapanese

【発明の詳細な説明】［産業上の利用分野］この発明は、プリンターの印字駆動部に使用されるアー
マチアやヨークのように、磁気回路を構成するとともに
耐摩耗性が要求される精密部品の表面硬化処理方法に関
するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to precision parts that constitute a magnetic circuit and require wear resistance, such as armatures and yokes used in the printing drive section of printers. The present invention relates to a surface hardening treatment method.

［従来の技術］従来において、軟磁特性が要求される精密部品、たとえ
ばプリンターの印字駆動部のアーマチア、ヨーク等には
、電磁軟鉄、ケイ素鋼等の表面に防錆および耐摩性を付
与する目的でＮＬメッキ、Ｚｎメッキ、Ｃｒメッキ、Ｎ
　ｉ　−Ｐ無電界メッキなどがほどこされている。[Prior Art] Conventionally, precision parts that require soft magnetic properties, such as the armature and yoke of the printing drive part of printers, have been made of electromagnetic soft iron, silicon steel, etc. for the purpose of imparting rust prevention and wear resistance to their surfaces. NL plating, Zn plating, Cr plating, N
i-P electroless plating is applied.

［発明が解決しようとする問題点］上記従来例において、Ｎｔメッキ、Ｚｎメッキは表面硬
度がＨＶ４００程度であり耐摩耗性で問題がある。Ｃｒ
メッキはＨＶ８００程度であり耐久性は有利であるが電
気メッキのため部品へのメッキの付き回りにムラがあり
、量産上不適当である。Ｎ１−Ｐメッキでも耐摩耗性が
ＨＶ４００以下と低いので問題である。なおＮ　ｉ　−
Ｐメッキ後４００℃前後で熱処理を行なうとＨＶ８００
程度に向上するが、その場合材料本来の磁気特性に劣化
が生じるため使用することができない。[Problems to be Solved by the Invention] In the conventional example described above, the surface hardness of Nt plating and Zn plating is about HV400, and there is a problem in wear resistance. Cr
The plating has an HV of about 800, which is advantageous in terms of durability, but because it is electroplated, the plating coverage on parts is uneven, making it unsuitable for mass production. Even with N1-P plating, the wear resistance is low at HV400 or less, which is a problem. Note that N i −
If heat treated at around 400℃ after P plating, HV800
However, in this case, the inherent magnetic properties of the material deteriorate, making it unusable.

［問題点を解決するための手段］この発明はこうした従来例における問題点を解決するた
めのものであり、ケイ素鋼部材に対し、まず、磁気特性
を得る目的、および表面の酸化膜の形成防止をかねて真
空中において焼鈍し、ついでメッキのための前処理とし
て、有機溶剤による脱脂処理、アルカリによる脱脂処理
、酸洗い処理、さらに酸とインヒビターの混合液による
シリコン酸化物除去処理を施した後、ニッケル・ボロン
系無電解化学メッキを施すことにより、被処理材の磁性
特性を損なうことなく、高硬度の表面硬化処理をするも
のである。[Means for Solving the Problems] The present invention is intended to solve the problems in the conventional examples, and first, it is aimed at obtaining magnetic properties and preventing the formation of an oxide film on the surface of silicon steel members. was annealed in vacuum, and then pre-treated for plating by degreasing with an organic solvent, degreasing with an alkali, pickling, and removing silicon oxide with a mixture of acid and inhibitor. By applying nickel-boron electroless chemical plating, the surface of the treated material is hardened to a high degree of hardness without impairing its magnetic properties.

［実施例コまず素材として３％ケイ素鋼を用い、所定の部品形状に
加工しておく。このケイ素鋼は磁気特性はすぐれている
が、表面が活性のため酸化膜（Ｓｉ０２）を形成しやす
い材料である。[Example 1] First, 3% silicon steel is used as a material and processed into a predetermined part shape. Although this silicon steel has excellent magnetic properties, it is a material that tends to form an oxide film (Si02) due to its active surface.

本発明による処理法は、第一ステップとして、ケイ素鋼
本来の磁気特性を得る目的とともにケイ素鋼表面に酸化
膜の形成防止を兼ねて、真空中において８５０℃、１時
間の焼鈍をおこなう。この場合、真空雰囲気以外のＮ　
２　、Ａ　ｒ等の無酸化雰囲気では表面見かけ上光輝に
仕上がるが、最終的なメッキ仕上り後の密着性が不十分
であり、真空雰囲気による熱処理が必要とされる。In the treatment method according to the present invention, as a first step, annealing is performed at 850° C. for 1 hour in a vacuum for the purpose of obtaining the original magnetic properties of silicon steel and also to prevent the formation of an oxide film on the surface of silicon steel. In this case, N
2. In a non-oxidizing atmosphere such as Ar, the surface appears to be bright, but the adhesion after the final plating finish is insufficient, and heat treatment in a vacuum atmosphere is required.

第二のステップとして、無電解Ｎｉメッキの前処理とし
て次の工程の処理をする。As a second step, the next step is performed as a pretreatment for electroless Ni plating.

（１）脱脂処理として、主に鉱物油の除去を目的として
有機溶剤による処理をする。有機溶剤として、例えば１
−１−１　トリクロルエタンの液中に超音波をかけて約
３分間浸漬する。(1) As degreasing treatment, treatment with an organic solvent is performed mainly for the purpose of removing mineral oil. As an organic solvent, for example, 1
-1-1 Apply ultrasonic waves to the trichloroethane solution and immerse for about 3 minutes.

（２）ついで第二の脱脂処理として、主に動、植物油の
除去を目的として、アルカリと表面活性剤の混合液、た
とえばオルソケイ酸ソーダのような市販のアルカリ脱脂
剤で、被処理材を揺動しなから約３分間液中に浸漬する
。(2) Next, as a second degreasing treatment, the material to be treated is shaken with a mixture of alkali and a surfactant, such as a commercially available alkaline degreaser such as sodium orthosilicate, mainly for the purpose of removing animal and vegetable oils. Immerse it in the liquid for about 3 minutes without moving.

（３）つぎに主に鉄の酸化物の除去を目的として、７％
の塩酸水溶液中で約１０〜３０秒披処理材を揺動しなが
ら浸漬する。(3) Next, mainly for the purpose of removing iron oxides, 7%
The treated material is immersed in an aqueous hydrochloric acid solution for about 10 to 30 seconds while rocking.

（４）さらに主にシリコンの酸化物の除去を目的として
、フッ素化合物を主成分とした、酸とインヒビターの混
合液の希釈液中に被処理物を揺動しながら１０〜３０秒
間浸漬する。(4) Furthermore, for the purpose of mainly removing silicon oxides, the object to be treated is immersed for 10 to 30 seconds while being rocked in a diluted mixture of an acid and an inhibitor containing a fluorine compound as a main component.

上記（１）〜（４）の前処理を施した後、最後に被処理
物の耐久性を上げる目的で、ジメチルアミンボランを還
元剤としたニッケル無電解メッキ液中に浸漬して、ニッ
ケルに１％程度のボロンを添加した無電解化学Ｎｉメッ
キ層を８〜１２μｍ程度付着させる。８μｍ未満では十
分な耐久性を得ることはできず、１２μｍを超えると密
着性に難が生じてくる。After performing the pre-treatments in (1) to (4) above, finally, in order to increase the durability of the object to be treated, it is immersed in a nickel electroless plating solution using dimethylamine borane as a reducing agent. An electroless chemical Ni plating layer containing about 1% boron is deposited to a thickness of about 8 to 12 μm. If it is less than 8 μm, sufficient durability cannot be obtained, and if it exceeds 12 μm, adhesion becomes difficult.

以上の工程を経て得られた被処理材はＮ１−Ｂ系のメッ
キによる表面硬度はＨＶ７００以上得られ、耐久性が向
上する。The treated material obtained through the above steps has a surface hardness of HV700 or more due to N1-B plating, and its durability is improved.

インパクト型ドツトプリンタの印字機構のヨークに本発
明の処理を施したものを用いて、従来のＮｉメッキのも
のを使ったプリンタと印字回数を比較すると、従来のも
のでは３０００万字程度の耐久性であったのに対し、本
発明のものでは約１億字と耐久性が飛躍的に向上した。Comparing the number of prints using a yoke of the printing mechanism of an impact dot printer treated with the present invention and a printer using a conventional Ni-plated one, the durability of the conventional one is about 30 million characters. On the other hand, the durability of the paper of the present invention was dramatically improved to about 100 million characters.

［発明の効果］この発明によれば、軟磁性精密部品に対し、磁性特性を
保ちながら、密着性よくメッキによる硬化層を形成する
ことができる。[Effects of the Invention] According to the present invention, a hardened layer can be formed by plating on a soft magnetic precision component with good adhesion while maintaining magnetic properties.

以　　上that's all

Claims (1)

Translated fromJapanese

【特許請求の範囲】軟磁性ケイ素鋼よりなる精密部品に対し、真空中で焼鈍する工程と、メッキの前処理として、有機溶剤による脱脂処理、アル
カリによる脱脂処理、酸洗い処理、さらに酸とインヒビ
ターの混合液によるシリコン酸化物除去処理を順次ほど
こす工程と、ニッケル・ボロン系無電解化学メッキを施す工程、とを含む軟磁性精密部品の表面硬化処理方法。[Claims] Precision parts made of soft magnetic silicon steel are annealed in vacuum, and pre-treatment for plating includes degreasing with an organic solvent, degreasing with an alkali, pickling, and further treatment with acid and an inhibitor. A surface hardening treatment method for soft magnetic precision parts, comprising the steps of sequentially applying silicon oxide removal treatment using a mixed solution of the above, and applying nickel-boron electroless chemical plating.