JP2011201475A - Method of manufacturing high-strength and lightweight headrest stay - Google Patents
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本発明はヘッドレストステーの製造方法に係るもので、より詳しくは従来の硬質クロムメッキ工程を代替した窒化−酸化（Oxynitrocarburizing）工程を適用して高強度及び軽量化が可能で耐食性に優れたヘッドレストステーの製造方法に関するものである。 The present invention relates to a method for manufacturing a headrest stay, and more specifically, a headrest stay that can be reduced in strength and weight by applying a nitriding-oxidizing (Oxynitrocarburizing) process that replaces a conventional hard chrome plating process and has excellent corrosion resistance. It is related with the manufacturing method.
自動車用ヘッドレストステーは運転者及び乗客の頭を衝撃から保護するためのヘッドレストを支持して自動車のシート上側でヘッドレストを一定の高さで調節することができるようにする。 The headrest stay for an automobile supports a headrest for protecting the heads of a driver and a passenger from an impact, and allows the headrest to be adjusted at a certain height above the seat of the automobile.
図１は一般的なヘッドレストステーの斜視図を示したものであり、図２は従来のヘッドレストステーの製造工程を示した手順図である。 FIG. 1 is a perspective view of a general headrest stay, and FIG. 2 is a procedure diagram showing a manufacturing process of a conventional headrest stay.
これに関して具体的に説明すると、ヘッドレストステーは直径７ｍｍ〜１５ｍｍのスチール棒材又は直径７ｍｍ〜１５ｍｍ、厚さ１ｍｍ〜３ｍｍのスチールパイプを切断して（Ｓ１０）、係止溝（１）及び両先端（２）のテーパ加工をした後（Ｓ２０）、折り曲げ過程を経て折り曲げ部（３）を形成した後（Ｓ３０）、メッキ層の厚さが１０μｍ程度になるように硬質クロムメッキを実施して（Ｓ４０）製品を製造する。 More specifically, the headrest stay is obtained by cutting a steel bar having a diameter of 7 mm to 15 mm or a steel pipe having a diameter of 7 mm to 15 mm and a thickness of 1 mm to 3 mm (S10), and the locking groove (1) and both ends. After the taper processing of (2) (S20), after forming the bent portion (3) through the bending process (S30), hard chrome plating is performed so that the thickness of the plating layer is about 10 μm ( S40) A product is manufactured.
このような従来のヘッドレストステーは容易な加工を目的としてＳＭ２０Ｃ相当の低い強度を有する素材を使用するために、車両の衝突の際、撓み又は破損で搭乗者の安全を脅かすことができる。直径が大きい素材を使用するとこのような安全問題はどの程度解決することができるが素材の費用及び重量増加の問題が台頭される。 Since such a conventional headrest stay uses a material having a low strength equivalent to SM20C for the purpose of easy processing, it is possible to threaten the safety of the occupant due to bending or breakage at the time of a vehicle collision. The use of a material with a large diameter can solve how much such a safety problem can be solved, but the cost and weight increase of the material are raised.
耐摩耗性及び耐食性の向上を目的で実施する硬質クロムメッキは、メッキの後にクロム金属になるので、規制対象ではないが工程の中又は廃水処理過程で６価クロムが発生して大気又は水質汚染を起こす。また工程の中数回の水洗過程を経るなど工程が複雑で、水洗の後にも６価クロムが製品の表面に残存する。特に、パイプの内部は水洗が容易でなくて残存する６価クロムが人体に悪い影響を与えるので全世界的に規制の対象になっている。またその色相が銀白色の単一色相のみ提供することができるので製品の見かけが単調である。 Hard chromium plating, which is performed for the purpose of improving wear resistance and corrosion resistance, becomes chromium metal after plating, so although it is not subject to regulation, hexavalent chromium is generated in the process or wastewater treatment process, resulting in air or water pollution. Wake up. Also, the process is complicated, such as through several washing steps in the process, and hexavalent chromium remains on the surface of the product after washing. In particular, the inside of the pipe is not easy to be washed with water, and the remaining hexavalent chromium has a bad influence on the human body. In addition, the appearance of the product is monotonous because it can provide only a single hue of silver white.
このように有害な６価クロムを代替するために３価クロムを使用する硬質クロムメッキ工程が開発されているが、３価クロムメッキはメッキ液に不純物の蓄積によりメッキ液の不安定性によって製品別の品質の偏差があり耐食性が低い。且つ色相が暗い灰色で６価クロムでのような光沢がなく、生産費用が６価クロムに比べて２〜３倍である点等で、商用化が進行されているが生産の側面では様々な問題点がある。 Hard chromium plating processes using trivalent chromium have been developed to replace harmful hexavalent chromium in this way, but trivalent chromium plating is classified by product due to instability of plating solution due to accumulation of impurities in the plating solution. There is a deviation in quality and the corrosion resistance is low. In addition, commercialization is progressing in that the hue is dark gray and there is no luster like hexavalent chromium, and the production cost is 2-3 times that of hexavalent chromium. There is a problem.
また６価クロム及び３価クロム全てメッキ中に発生した水素が製品の内部に拡散されて車両の衝突の際に水素脆性による破損で搭乗者を保護することができない問題も共に有している。 In addition, both the hexavalent chromium and the trivalent chromium have a problem that hydrogen generated during plating is diffused into the product and the passenger cannot be protected due to damage due to hydrogen embrittlement in the event of a vehicle collision.
前記のように、従来のヘッドレストステーの製造工程では、硬質クロムメッキ工程中に発生する６価クロムで環境汚染の問題があって、強度が低くて、衝突の際に水素脆性による破損又は撓みの発生の恐れがあり製品品質の不安定性などの問題がある。 As described above, in the conventional headrest stay manufacturing process, there is a problem of environmental pollution due to hexavalent chrome generated during the hard chrome plating process, the strength is low, and damage or bending due to hydrogen embrittlement in the event of a collision. There are problems such as instability of product quality.
したがって、本発明はこのような従来技術の問題点を鑑みて案出されたものであり、本発明の目的は高強度で衝突の際に搭乗者の安全を図って工程中に排出される公害物質がなくて製造工程が環境にやさしいだけでなく、耐食性が高く、軽くて多様なカラーの具現が可能で美的特性を高揚させることができるヘッドレストステーの製造方法を提供することにある。 Therefore, the present invention has been devised in view of such problems of the prior art, and the object of the present invention is a high-intensity pollution that is discharged during the process for the sake of passenger safety in the event of a collision. It is an object of the present invention to provide a method for manufacturing a headrest stay that is not only environmentally friendly, but also has a high corrosion resistance, is light and can implement various colors, and can enhance aesthetic characteristics.
本発明の他の目的及び長所等は下記に説明されるはずであり、本発明の実施例によって分かるようになるだろう。 Other objects and advantages of the present invention will be described below, and will be understood by embodiments of the present invention.
このような目的を達成するために、本発明によると、（ａ）棒材又はパイプ状のヘッドレストステー用素材を切断した後、係止溝と両先端を加工する段階、（ｂ）前記（ａ）段階を経た素材に対して窒化−酸化熱処理工程を実施する段階、（ｃ）前記（ｂ）段階を経た素材に対して表面機械加工を実施する段階、及び（ｄ）前記（ｃ）段階を経た素材を折り曲げる段階を含むことを特徴とする高強度及び軽量のヘッドレストステーの製造方法が提供される。 In order to achieve such an object, according to the present invention, (a) after cutting a bar or pipe-shaped headrest stay material, processing a locking groove and both ends, (b) said (a ) A step of performing a nitriding-oxidizing heat treatment process on the material that has undergone step (c), a step of performing surface machining on the material that has undergone step (b), and (d) the step of (c). There is provided a method for manufacturing a high-strength and lightweight headrest stay, including a step of bending a passed material.
本発明によると、望ましくは、前記（ｄ）段階を経た後、カラー酸化層を形成するための酸化熱処理を実施する段階をさらに含む。 Preferably, the method further includes a step of performing an oxidation heat treatment for forming a color oxide layer after the step (d).
また、本発明によると、望ましくは、前記（ｄ）段階を経た後、樹脂コーティング処理を実施する段階をさらに含む。 In addition, according to the present invention, preferably, the method further includes a step of performing a resin coating process after the step (d).
さらに、本発明によると、望ましくは、前記カラー酸化層を形成するための酸化熱処理を実施する段階を経た後、前記素材に対して樹脂コーティング処理を実施する段階をさらに含む。 The method may further include performing a resin coating process on the material after performing an oxidation heat treatment for forming the color oxide layer.
前記のようになされた本発明のヘッドレストステーの製造方法は次のような効果を提供する。 The manufacturing method of the headrest stay of the present invention made as described above provides the following effects.
第１、従来に比べて水素脆性のない高強度および軽量ヘッドレストステーを提供することができる。 First, it is possible to provide a high-strength and lightweight headrest stay that does not have hydrogen embrittlement compared to the prior art.
第２、従来の硬質クロムメッキ法とは異なる無公害方法として環境汚染を防止することができる。 Second, environmental pollution can be prevented as a pollution-free method different from the conventional hard chrome plating method.
第３、従来の方法では発現することができない各種色相のカラーを具現することができ、車両のインテリアを多様化することができる。 Third, colors of various hues that cannot be expressed by the conventional method can be realized, and the interior of the vehicle can be diversified.
第４、窒化−酸化工程の後カラー酸化処理及び樹脂コーティングを実施する場合、優れた耐食性を確保することが可能である。 Fourth, when color oxidation treatment and resin coating are performed after the nitridation-oxidation step, it is possible to ensure excellent corrosion resistance.
以下、本発明を詳細に説明することにする。 Hereinafter, the present invention will be described in detail.
本発明は直径７ｍｍ〜１５ｍｍのスチール棒材又は直径７ｍｍ〜１５ｍｍ、厚さ１ｍｍ〜３ｍｍのスチールパイプを所定の長さで切断して、係止溝および両先端を加工して窒化−酸化熱処理工程を実施する。 In the present invention, a steel bar having a diameter of 7 mm to 15 mm or a steel pipe having a diameter of 7 mm to 15 mm and a thickness of 1 mm to 3 mm is cut to a predetermined length, and the locking groove and both ends are processed to perform a nitriding-oxidizing heat treatment step. To implement.
この後、バフ（Buff）、ポリッシング（Polishing）、ラッピング（Lapping）などのような表面機械加工を実施し、折り曲げた後、必要によって樹脂コーティングをしたり又は折り曲げた後必要によって酸化処理のみを実施したり又は酸化処理の後樹脂コーティングを実施する段階から構成される。 After this, surface machining such as buffing, polishing, lapping, etc. is performed, and after bending, resin coating is performed if necessary, or only oxidation treatment is performed if necessary. Or after the oxidation treatment, a resin coating is performed.
以下、添付の図面を参照して本発明をより詳細に説明することにする。 Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
図３は本発明によるヘッドレストステーの製造方法を示した手順図である。 FIG. 3 is a flow chart showing a method for manufacturing a headrest stay according to the present invention.
図３を参照すると、まず本発明は直径７ｍｍ〜１５ｍｍのスチール棒材又は直径７ｍｍ〜１５ｍｍ、厚さ１ｍｍ〜３ｍｍのスチールパイプを所定の長さで切断する（Ｓ１０）。 Referring to FIG. 3, the present invention first cuts a steel rod having a diameter of 7 mm to 15 mm or a steel pipe having a diameter of 7 mm to 15 mm and a thickness of 1 mm to 3 mm to a predetermined length (S10).
この際、素材の表面粗度は特に制限しないが最終製品の耐食性、光沢度、外観などを考慮して２μｍＲａ以下が好ましい。 At this time, the surface roughness of the material is not particularly limited, but is preferably 2 μmRa or less in consideration of the corrosion resistance, glossiness, appearance, etc. of the final product.
このように切断した素材にヘッドレストステーの高低を調節する係止溝（１）とヘッドレストステーがシート上部に容易に組み付けられるように両先端部（２）のテーパ加工を実施する（Ｓ２０）。 The front end portion (2) is tapered so that the locking groove (1) for adjusting the height of the headrest stay and the headrest stay can be easily assembled to the upper portion of the seat in the cut material (S20).
以後、窒化−酸化（Oxynitrocarburizing）熱処理工程を実施する（Ｓ４０）。この窒化−酸化工程は強度、耐食性および耐摩耗性の向上などを目的で実施することで、前記工程は窒化性雰囲気に酸化性ガスを混合して形成された窒化−酸化ガス雰囲気中で鋼を酸窒化浸炭する際、窒素、炭素および酸素が同時に拡散、浸透される熱化学的処理法である。 Thereafter, a nitriding-oxidizing (Oxynitrocarburizing) heat treatment process is performed (S40). This nitriding-oxidizing step is carried out for the purpose of improving strength, corrosion resistance and wear resistance, etc., and in the nitriding-oxidizing gas atmosphere formed by mixing the oxidizing gas in the nitriding atmosphere, the step is performed. This is a thermochemical treatment method in which nitrogen, carbon and oxygen are simultaneously diffused and permeated during oxynitriding carburization.
このような窒化−酸化工程によってヘッドレストステーの最表面には少量のＦｅ3Ｏ4とＦｅ２Ｏ３の酸化物層が形成されて、その真下にε−相の窒化物層または窒炭化物層が、そして前記窒化物層または窒炭化物層の下に窒素が拡散、固溶された窒素拡散層が形成されて、この後表面機械加工によって前記酸化物層を除去することによって銀白色の耐食性に優れた素材を確保することができる。 A small amount of an Fe 3 O 4 and Fe 2 O 3 oxide layer is formed on the outermost surface of the headrest stay by such a nitriding-oxidizing process, and an ε-phase nitride layer or nitrocarbide layer is formed immediately below the oxide layer. Further, a nitrogen diffusion layer in which nitrogen is diffused and solid-dissolved is formed under the nitride layer or the nitrogen carbide layer, and thereafter, the oxide layer is removed by surface machining, thereby being excellent in silver white corrosion resistance. Material can be secured.
前記窒化−酸化工程は耐食性が高いε−相の窒化物層または窒炭化物層を形成することによって硬質クロムメッキ工程を代替することができ、且つ窒素拡散層によって強度が向上されるので車両の衝突の際にヘッドレストステーの変形または破損を防止して搭乗者の安全を確保することができて、このような強度の向上によって１０〜２０％程度の軽量化が可能な利点もある。 The nitridation-oxidation process can replace the hard chrome plating process by forming an ε-phase nitride layer or nitrocarbide layer having high corrosion resistance, and the strength is improved by the nitrogen diffusion layer. In this case, deformation or breakage of the headrest stay can be prevented to ensure the safety of the occupant, and there is an advantage that the weight can be reduced by about 10 to 20% by such an improvement in strength.
さらに、硬質クロムメッキではメッキ工程中に発生した水素原子が鋼の表面に拡散して水素脆性を起こして小さい衝撃にも破損される可能性があるが、このような窒化−酸化工程では水素脆性が発生せず、むしろ強度を高めることができる。 Furthermore, in hard chrome plating, hydrogen atoms generated during the plating process may diffuse to the surface of the steel and cause hydrogen embrittlement, which can be damaged by small impacts. Does not occur, but rather the strength can be increased.
本発明で前記窒化−酸化熱処理工程は同一の炉内で窒化と酸化が同時に起こることを意味して、ここで窒化熱処理工程は広義の意味で窒化と窒化浸炭を含む熱処理工程である。 In the present invention, the nitriding-oxidizing heat treatment step means that nitriding and oxidation occur simultaneously in the same furnace, and the nitriding heat treatment step is a heat treatment step including nitriding and nitrocarburizing in a broad sense.
前記窒化−酸化熱処理はガス法、プラズマ法、塩浴法、真空法などを含む全ての熱処理過程で実施することができる。 The nitridation-oxidation heat treatment can be performed in all heat treatment processes including a gas method, a plasma method, a salt bath method, and a vacuum method.
高耐食性と高耐摩耗性を考慮して単一のε−相の窒化物層の厚さは１０〜３０μｍが好ましく、このために窒化−酸化処理温度は５００℃〜６００℃とする。これより温度が低い場合、化合物層の成長速度が低くて短時間に十分な厚さの窒化物層を得ることが難しく、これより温度が高いと、単一のε−相を得ることができるほど窒化物層内の窒素の濃度を高めることが難しいからである。 In consideration of high corrosion resistance and high wear resistance, the thickness of the single ε-phase nitride layer is preferably 10 to 30 μm, and for this purpose, the nitriding-oxidizing temperature is set to 500 ° C. to 600 ° C. When the temperature is lower than this, it is difficult to obtain a nitride layer having a sufficient thickness in a short time because the growth rate of the compound layer is low. When the temperature is higher than this, a single ε-phase can be obtained. This is because it is difficult to increase the concentration of nitrogen in the nitride layer.
窒化−酸化の処理時間は２時間〜８時間とすることが好ましく、これより短いと窒化物層の厚さが薄く、これより長いと窒化物層が厚くなりすぎて剥離が起こるからである。 The treatment time of nitriding-oxidation is preferably 2 to 8 hours, and if it is shorter than this, the thickness of the nitride layer is thin, and if it is longer than this, the nitride layer becomes too thick and peeling occurs.
前記窒化−酸化工程を実施したヘッドレストステーはその後表面の酸化物を除去して、均一な粗度を得るために研磨、バッフィング（buffing）、ラッピング（Lapping）もしくはポリッシング（polishing）のような表面機械加工を実施して銀白色のヘッドレストステーを得る（Ｓ５０）。 The headrest stay that has been subjected to the nitridation-oxidation process is then subjected to a surface machine such as polishing, buffing, lapping or polishing in order to remove surface oxide and obtain uniform roughness. Processing is performed to obtain a silver-white headrest stay (S50).
その次に、前記表面機械加工を通じて得られたヘッドレストステーを折り曲げて（Ｓ３０）製品を完成する。 Next, the headrest stay obtained through the surface machining is bent (S30) to complete the product.
ところで、図２に示した従来の製造工程では折り曲げた後（Ｓ３０）、硬質クロムメッキ（Ｓ４０）を実施する。その理由は、係止溝及び両先端加工（Ｓ２０）後折り曲げの前には、一直線の形態なのに比べて折り曲げた状態（Ｓ３０）は“コ”の字を１８０°回転した字の形態で、このような形態が硬質クロムメッキ工程の際（Ｓ４０）、製品を治具に装着して陰極の電気を流すことが容易になるからである。 By the way, in the conventional manufacturing process shown in FIG. 2, after bending (S30), hard chrome plating (S40) is implemented. The reason for this is that the latched groove and both ends are processed (S20), and after folding, the folded state (S30) is in the form of a character rotated by 180 ° compared to the straight shape. This is because, in the case of the hard chrome plating step (S40), it is easy to attach the product to a jig and to flow electricity from the cathode.
反面、本発明で窒化−酸化工程のための製品の治具装着の際、折り曲げた状態は多くの空間を占めるので炉内に装入することができる製品の数量に制限があり、表面機械加工が容易ではない問題がある。 On the other hand, when mounting the product jig for the nitriding-oxidizing process in the present invention, the folded state occupies a lot of space, so the number of products that can be charged in the furnace is limited, and surface machining There is a problem that is not easy.
従って、係止溝および両先端の加工を実施して窒化−酸化工程と表面機械加工を経た後折り曲げを実施すると、多量の製品を熱処理することができ、表面機械加工が容易になるという利点がある。 Therefore, when the folding is performed after the nitriding-oxidizing step and the surface machining are performed after the locking groove and both ends are machined, a large quantity of products can be heat-treated, and the surface machining is facilitated. is there.
このような工程で製造された製品の色相は銀白色で、銀白色のほかに多様なカラー色相を必要とする場合には後続工程でカラー酸化層被膜形成のための酸化処理をさらに実施することができる（Ｓ６０）。 The color of the product manufactured in such a process is silver white, and when various color hues are required in addition to silver white, an oxidation process for forming a color oxide layer film is further performed in the subsequent process. (S60).
この酸化処理は表面機械加工を経た銀白色のヘッドレストステーを高温の酸化性雰囲気で加熱してε−相の窒化物または窒炭化物層の上に厚さ数ｎｍ以下の鉄酸化物層を形成して、この鉄酸化物層の表面から反射された光と鉄酸化物層を透過して窒化物または窒炭化物層の表面から反射された光が互いに干渉して独特の色相を発現させるためのもので、その色相は酸化処理温度、時間、酸化雰囲気によって金色、紫色、青色及び黒色等で発現されることができる。この鉄酸化物層はその色相が多様で美麗であるだけでなく、同時に優れた耐食性も付与するので、車両設計者にとって設計選択の幅を広めることができる。またこの鉄酸化物層は折り曲げ部位に発生した微細な亀裂を埋めて、耐食性を補完することもできる。 In this oxidation treatment, a silver-white headrest stay that has undergone surface machining is heated in a high-temperature oxidizing atmosphere to form an iron oxide layer having a thickness of several nanometers or less on the ε-phase nitride or nitride carbide layer. The light reflected from the surface of the iron oxide layer and the light reflected from the surface of the nitride or nitrogen carbide layer through the iron oxide layer interfere with each other to develop a unique hue. The hue can be expressed in gold, purple, blue, black and the like depending on the oxidation temperature, time, and oxidizing atmosphere. This iron oxide layer not only has a variety of colors and is beautiful, but also provides excellent corrosion resistance, so that the vehicle designer can widen the range of design choices. Moreover, this iron oxide layer can also fill the minute crack which generate | occur | produced in the bending site | part, and can also supplement corrosion resistance.
前記酸化処理条件は発現しようとする色相によって、温度は２００℃〜４００℃の範疇として、酸化処理時間は３０分〜４時間とする。このような理由は酸化処理温度を２００℃未満とすると酸化処理が行われず所望の鉄酸化物層を得ることができなくなり、酸化処理温度が４００℃を超えると光沢度が低い黒色が発現するからである。 The oxidation treatment conditions are set in the range of 200 ° C. to 400 ° C. and the oxidation treatment time is 30 minutes to 4 hours depending on the hue to be developed. The reason is that if the oxidation treatment temperature is less than 200 ° C., the oxidation treatment is not performed and a desired iron oxide layer cannot be obtained, and if the oxidation treatment temperature exceeds 400 ° C., black having a low glossiness appears. It is.
さらに、酸化処理時間が３０分未満の場合、酸化物層が形成される温度に到達できなくて所望のカラー酸化物層を得ることが難しく、酸化処理時間が４時間を越える際黒色でだけ維持されるので経済的な観点から不要な時間をもたらす。 Furthermore, if the oxidation treatment time is less than 30 minutes, the temperature at which the oxide layer is formed cannot be reached and it is difficult to obtain a desired color oxide layer, and only black is maintained when the oxidation treatment time exceeds 4 hours. This will bring unnecessary time from an economic point of view.
以後に樹脂コーティングをさらに実施することもできる（Ｓ７０）。 Thereafter, resin coating can be further performed (S70).
この樹脂コーティングはヘッドレストステーに高光沢性、耐指紋性及び耐汚染性を付与して耐食性を向上させるためのもので、その方法はポリ−エチレン系、ポリ−ウレタン系、ポリ−アクリル系又はポリ−アルキド系などの液状塗料をスプレー、浸積または前記樹脂の粉体塗装又は電着などの方法でヘッドレストステーの表面に３μｍ〜５０μｍの厚さで塗布して３０℃〜３００℃の温度範囲で乾燥する過程で構成され、このような工程によって前記ヘッドレストステーの表面には透明な樹脂コーティング層が形成される。 This resin coating is for improving the corrosion resistance by imparting high gloss, fingerprint resistance and stain resistance to the headrest stay, and the method can be poly-ethylene, poly-urethane, poly-acrylic or poly-acrylic. -Liquid paint such as alkyd type is applied to the surface of the headrest stay by a method such as spraying, dipping or powder coating or electrodeposition of the resin in a temperature range of 30 to 300 ° C. A transparent resin coating layer is formed on the surface of the headrest stay by such a process.
前記のように、本発明によると、従来の硬質クロムメッキ法に比べて強度を高めて車両の搭乗者の安全を確保して軽量化が可能である。また耐食性に優れて硬質クロムメッキ法では具現することができない多様な色相を発現することができ装飾性に優れた高強度の軽量ヘッドレストステーを製造することができる。 As described above, according to the present invention, it is possible to increase the strength as compared with the conventional hard chrome plating method to ensure the safety of the vehicle occupant and to reduce the weight. In addition, it is possible to produce a high-strength lightweight headrest stay that has excellent corrosion resistance and can exhibit various hues that cannot be realized by the hard chrome plating method, and has excellent decorativeness.
以下、本発明の実施例を説明する。 Examples of the present invention will be described below.
＜実施例１＞
ＳＭ２０Ｃ相当の素材を直径１０ｍｍ、長さ６５ｃｍで切断して、係止溝と両先端を加工した。この素材を直径１,２００ｍｍ、高さ３,０００ｍｍのピット型炉で流量３５ｍ3／hrとし、ガス組成が６０ｖｏｌ％アンモニア−４ｖｏｌ％プロパンガス−１６ｖｏｌ％空気−２０ｖｏｌ％窒素の雰囲気で３.５時間の間、ガス窒化−酸化熱処理を実施し、この後バッフィングを実施して銀白色の製品を得た。
<Example 1>
A material equivalent to SM20C was cut into a diameter of 10 mm and a length of 65 cm to process the locking groove and both ends. This material was 3.5 mm in a pit type furnace having a diameter of 1,200 mm and a height of 3,000 mm and a flow rate of 35 m 3 / hr and a gas composition of 60 vol% ammonia-4 vol% propane gas-16 vol% air-20 vol% nitrogen. A gas nitridation-oxidation heat treatment was performed for a period of time, followed by buffing to obtain a silver white product.
本実施例による製品と、これと同一の規格の素材に従来のようにメッキ層の厚さが１０μｍになるように硬質クロムメッキを実施した製品の引張強度を同一の条件でそれぞれ測定して比較した結果、硬質クロムメッキ品は３９ｋｇｆ／ｍｍ2なのに比べて、本実施例の製品は４８ｋｇｆ／ｍｍ2として本実施例の製品の引張強度が２３％向上された。 Tensile strength of the product according to this example and the product of which the hard chromium plating is applied to the same standard material so that the plating layer thickness is 10 μm as before is compared under the same conditions. As a result, the product of this example was 48 kgf / mm 2 and the tensile strength of the product of this example was improved by 23%, compared with 39 kgf / mm 2 for the hard chrome plated product.
＜実施例２＞
ＳＭ２０Ｃ相当の素材を直径１０ｍｍ、長さ６５ｃｍで切断して、実施例１のような順で処理して製品を製作した。但しこの際、窒化−酸化工程は実施例１と同一のピット型炉で総流量４０ｍ3／hrとし、ガス組成が６０ｖｏｌ％アンモニア−２ｖｏｌ％プロパンガス−１８ｖｏｌ％空気−２０ｖｏｌ％窒素の雰囲気で４時間の間、ガス窒化−酸化処理を実施して、この後バッフィングを実施して銀白色の製品を得た。
<Example 2>
A material equivalent to SM20C was cut into a diameter of 10 mm and a length of 65 cm, and processed in the order as in Example 1 to produce a product. However, in this case, the nitriding-oxidizing step was performed in the same pit type furnace as in Example 1 with a total flow rate of 40 m 3 / hr and a gas composition of 60 vol% ammonia-2 vol% propane gas-18 vol% air-20 vol% nitrogen. Gas nitriding-oxidation treatment was performed for a time, and then buffing was performed to obtain a silver white product.
この後、この製品を折り曲げた後、２２０℃の空気雰囲気で２時間の間酸化熱処理をして黄金色の色相を有する製品を得た。本実施例の製品と、これと同一の規格の素材に従来のようにメッキ層の厚さが１０μｍになるように硬質クロムメッキを実施した製品の耐食性を同一の条件でそれぞれ測定して比較した結果、硬質クロムメッキ品は９６時間後発錆があったが、本実施例の製品は２５０時間以後にも発錆がなかった。 Thereafter, the product was bent and then subjected to an oxidation heat treatment in an air atmosphere at 220 ° C. for 2 hours to obtain a product having a golden hue. Corrosion resistance of the product of this example and the product of which the hard chromium plating was applied to the same standard material so that the thickness of the plating layer was 10 μm as in the past was measured and compared under the same conditions. As a result, the hard chrome plated product was rusted after 96 hours, but the product of this example was not rusted after 250 hours.
以上のように、本発明はたとえ限定された実施例と図面によって説明されたが、本発明はこれによって限定されず、本発明が属する技術分野における通常の知識を持つ者により本発明の技術思想と下記に記載される特許請求範囲の均等範囲内で多様な修正及び変形が可能なのはもちろんである。 As described above, the present invention has been described with reference to the limited embodiments and drawings. However, the present invention is not limited thereto, and technical ideas of the present invention can be obtained by persons having ordinary knowledge in the technical field to which the present invention belongs. It goes without saying that various modifications and variations are possible within the scope of the claims described below.
Claims (5)
（ｂ）前記（ａ）段階を経た素材に対して窒化−酸化熱処理工程を実施する段階、
（ｃ）前記（ｂ）段階を経た素材に対して表面機械加工を実施する段階、及び
（ｄ）前記（ｃ）段階を経た素材を折り曲げる段階、
を含むことを特徴とする高強度及び軽量のヘッドレストステーの製造方法。 (A) After cutting the bar or pipe-shaped headrest stay material, processing the locking groove and both ends;
(B) performing a nitriding-oxidizing heat treatment step on the material that has undergone the step (a)
(C) performing surface machining on the material that has undergone the step (b), and (d) folding the material that has undergone the step (c).
A method for manufacturing a high-strength and lightweight headrest stay, comprising:
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07166322A (en) * | 1993-06-15 | 1995-06-27 | Yong-Hui Kim | Preparation of steel part for substituting for plating treatment |
| JPH11318630A (en) * | 1998-05-21 | 1999-11-24 | Tachi S Co Ltd | Head restraint |
| JP2006304869A (en) * | 2005-04-26 | 2006-11-09 | Arai Seisakusho:Kk | Method of manufacturing headrest stay |
| JP2007297702A (en) * | 2006-05-01 | 2007-11-15 | He Kim Yun | Method for producing highly corrosion-resistant color steel |
-
2010
- 2010-03-26 JP JP2010072549A patent/JP2011201475A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07166322A (en) * | 1993-06-15 | 1995-06-27 | Yong-Hui Kim | Preparation of steel part for substituting for plating treatment |
| JPH11318630A (en) * | 1998-05-21 | 1999-11-24 | Tachi S Co Ltd | Head restraint |
| JP2006304869A (en) * | 2005-04-26 | 2006-11-09 | Arai Seisakusho:Kk | Method of manufacturing headrest stay |
| JP2007297702A (en) * | 2006-05-01 | 2007-11-15 | He Kim Yun | Method for producing highly corrosion-resistant color steel |
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