KR20160109189A - Brass plated steel wire for gold plated spring and process for the same - Google Patents

Brass plated steel wire for gold plated spring and process for the same Download PDF

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Publication number
KR20160109189A
KR20160109189A KR1020150033183A KR20150033183A KR20160109189A KR 20160109189 A KR20160109189 A KR 20160109189A KR 1020150033183 A KR1020150033183 A KR 1020150033183A KR 20150033183 A KR20150033183 A KR 20150033183A KR 20160109189 A KR20160109189 A KR 20160109189A
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South Korea
Prior art keywords
steel wire
brass
spring
plated
gold
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KR1020150033183A
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Korean (ko)
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김종성
정민종
임한준
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홍덕산업(주)
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Priority to KR1020150033183A priority Critical patent/KR20160109189A/en
Priority to PCT/KR2015/004958 priority patent/WO2016143946A1/en
Publication of KR20160109189A publication Critical patent/KR20160109189A/en

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0607—Wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/58—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of copper
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils

Abstract

The present invention relates to a steel wire used as a material for a gold-plated spring. A brass-plated layer, containing 30-45% of zinc and 55-70% of copper, is formed on the surface of the steel wire with 0.5-2.0m of thickness. A concentration of Fe among components of the brass-plated layer is not more than 4%. According to the present invention, a method to manufacture a steel wire includes: a step of primarily drawing a material wire rod in a dry state with a diameter of 2.0-4.0mm; a step of thermally treating the primarily drawn steel wire and then secondarily drawing the same with a diameter of 0.5-1.5mm; a step of sequentially forming copper and zinc-plated layers, containing 55-70% of copper and 30-45% of zinc, on the surface of the secondarily drawn steel wire and then a brass-plated layer with 2.0-4.0m through thermal diffusion; and a step of tertiarily drawing the wire so that the thickness of the brass-plated layer becomes 0.5-2.0m and the final diameter of the wire becomes 0.01-1.0mm.

Description

금도금 스프링용 황동도금 강선 및 그 제조방법{BRASS PLATED STEEL WIRE FOR GOLD PLATED SPRING AND PROCESS FOR THE SAME}[0001] BRASS PLATED STEEL WIRE FOR GOLD PLATED SPRING AND PROCESS FOR THE SAME [0002]

본 발명은 금도금된 스프링용으로 사용되는 황동도금된 강선에 관한 것으로, 보다 자세하게는 소재 와이어 로드에 대한 신선 공정의 중간에 황동 도금층을 형성하고, 황동도금된 강선을 최종 선경으로 신선하여 얻어지는 금도금 스프링용으로써 신선성과 스프링 성형성을 향상함과 아울러 제조공정의 단순화를 도모할 수 있도록 한 금도금 스프링용 황동도금 강선 및 그 제조방법에 관한 것이다. The present invention relates to a brass-plated steel wire used for a gold-plated spring, more specifically, a brass plating layer is formed in the middle of a drawing process for a workpiece wire rod, and a brass- To a brass plated steel wire for a gold-plated spring and a method for manufacturing the same, which can improve the freshness and the spring formability and simplify the manufacturing process.

일반적으로 기계장치 등의 산업용으로 사용되는 스프링의 경우에는 주로 내식성 향상을 위한 차원의 표면 피막처리가 행해지고 있다. 한편, 요즘에는 침대 매트용 스프링이나 제품의 외부로 스프링 자체가 드러나는 경우에는 상기 내식성에 더하여 광택 특성 및 장식성을 부여하기 위하여 스프링 표면에 금도금이 행해지게 된다.Generally, in the case of a spring used for industrial purposes such as a mechanical device, a surface coating treatment is generally carried out in order to improve corrosion resistance. On the other hand, when the spring itself is exposed to the outside of the spring for the bed mat or the product itself, gold plating is performed on the surface of the spring in order to impart glossiness and decorative property in addition to the corrosion resistance.

종래의 금도금 스프링의 제조공정에서는, 먼저 소재 와이어 로드에 대한 산세 및 피막 처리 단계에 이은 신선 및 패턴팅(patenting) 열처리를 한 후에 윤활특성 부여를 위한 피막처리를 하고, 피막처리된 강선을 신선하여 스프링용 강선을 얻고, 이렇게 해서 얻어진 스프링용 강선으로 스프링 성형 후, 상기 신선 단계에서 강선의 표면에 행해진 피막을 제거한 연후에 하지도금을 행하고 그 위에 금도금을 함으로써 최종적으로 금도금된 스프링이 얻어지게 된다.In the manufacturing process of the conventional gold-plated spring, first, after subjecting the raw wire rod to a pickling and coating treatment step, a freshness and a patenting heat treatment are performed, then a coating treatment is performed for imparting lubrication characteristics, After the steel wire for spring is obtained and after the spring formed by the thus obtained spring steel wire is subjected to the base plating after the coating film formed on the surface of the steel wire is removed in the drawing step and gold plating is performed thereon, finally a gold- plated spring is obtained.

상기 강선의 표면에 형성된 피막층은 후속 신선 공정 및 스프링 성형작업시 윤활제 역할을 하게 되는바, 스프링 성형 후 금도금을 위해서는 원활한 금도금층 형성을 위해서 반드시 피막의 제거와 함께 하지도금층을 형성하게 된다.The coating layer formed on the surface of the steel wire serves as a lubricant in the subsequent drawing process and spring forming operation. In order to form a gold-plated layer after the spring-forming process, the coating layer is formed together with the removal of the coating layer.

이와 같이 종래의 금도금 스프링의 제조를 위해서는 금도금용 스프링 강선의 제작단계에서 피막처리 공정을 필요로 하게 되고, 또한 피막처리된 강선을 이용해서 스프링으로의 성형이 완료된 이후에 기 형성된 피막의 제거 공정 및 하지도금층 형성이라는 번거로운 공정을 거쳐야하는 제조 공정상의 문제점이 있다.Thus, in order to manufacture the conventional gold-plated spring, a coating process is required at the manufacturing step of the gold-plated spring steel wire, and after the formation of the spring is completed using the coated steel wire, There is a problem in the manufacturing process that a complicated process of forming a base plating layer is required.

이에 더하여, 종래 금도금 스프링의 제조방법에서는 스프링용 강선의 신선단계에서 행해지는 피막이 불균일할 경우에는 후속되는 스프링 성형시 윤활성 부족에 따른 품질불량이 발생할 수 있으며, 스프링 성형 후 피막제거 과정에서 피막이 완전하게 제거되지 않았을 때에는 금도금이 제대로 이루어지지 않게 되는 문제점이 있다.In addition, in the conventional method of manufacturing the gold-plated spring, if the coating is uneven in the drawing step of the steel wire for the spring, quality deficiency may occur due to lack of lubricity during the subsequent spring forming. There is a problem in that the gold plating is not properly performed.

종래 스프링 강선의 제조방법의 하나로 공개특허 제10-2008-0077313호에는 소재 와이어 로드에 피막양 3.0∼5.5g/㎡의 인산염을 전해처리에 의해 피복하고 윤활제와 함께 신선하여 스프링용 강선을 얻음으로써, 상기 스프링용 강선을 이용한 스프링 성형시 가공성의 향상이 이루어지도록 한 기술이 개시되고 있다. Conventionally, as a method of manufacturing a spring steel wire, Patent Document 10-2008-0077313 discloses a method in which a phosphate wire having a coating amount of 3.0 to 5.5 g / m < 2 > is coated on a workpiece wire rod by electrolytic treatment, , And a workability is improved in spring forming using the spring steel wire.

그러나, 상기의 인산염 피막이 피복된 스프링용 강선을 가지고 금도금된 스프링으로 제작하기 위해서는 상술한 바와 같이 스프링 성형가공 후 피복된 인산염 피막을 제거하고 별도의 하지도금을 한 후에 템퍼링을 거쳐 금도금을 행하는 번거로운 제조공정을 거쳐야만 하는 공정상의 불편과 그에 따른 제조비용의 상승을 피할 수가 없는 문제점이 있다. However, in order to fabricate the spring-coated steel wire coated with the phosphate coating as described above, it is necessary to remove the phosphate coating after the spring forming process and to perform gold plating by tempering after another base plating, There is a problem in that the inconvenience of the process that must be subjected to the process and the increase of the manufacturing cost resulting therefrom can not be avoided.

본 발명은 종래의 금도금 스프링용 강선에서 지적되고 있는 상기의 문제점을 해결하기 위한 것으로서, 소재 와이어 로드에 대한 다단계 신선의 중간에 황동 도금층이 형성되도록 한 후에 최종 신선을 행하여 스프링용 강선을 얻고, 이후의 스프링 성형 후 별도의 피막제거 및 하지도금 공정을 수행함이 없이 템퍼링에 이어 곧바로 금도금을 행하는 단순화된 제조공정으로 금도금된 스프링용 황동도금 강선 및 그 제조방법을 제공하는데 발명의 목적이 있다.The present invention has been made to solve the above-mentioned problem, which is pointed out in a conventional steel wire for a gold-plated spring, in which a brass plating layer is formed in the middle of a multi-step wire drawing to a workpiece wire rod, The present invention provides a gold-plated brass-plated steel wire for a spring and a method of manufacturing the same by a simple manufacturing process of performing gold plating immediately after tempering without performing separate coating removal and undercoating process.

본 발명의 또 다른 목적은 소재 와이어 로드의 신선 단계에서 황동 도금층을 형성함에 있어서 황동 도금층 내의 Fe 농도를 일정 범위 내로 유지함으로써 이후의 스프링용 강선에 대한 스프링 성형에 이은 템퍼링 열처리 후에 황동 도금층과 금도금층 계면에서 산화철 피막이 발생하여 금도금층의 밀착력 저하 또는 박리가 일어나는 것이 방지되도록 한 금도금된 스프링용 황동도금 강선 및 그 제조방법을 제공하는데 있다. It is still another object of the present invention to provide a method of forming a brass plated layer in a drawing step of a workpiece wire rod by maintaining the Fe concentration in the brass plating layer within a certain range, Plated steel wire for a spring to prevent the adhesion of the gold-plated layer from being deteriorated due to the occurrence of an iron oxide coating at the interface, or peeling thereof, and a method for manufacturing the same.

본 발명의 상기 목적은, 강선의 표면에 아연 함유량이 30∼45%이고 구리 함유량이 55∼70%인 황동 도금층이 0.5∼2.0㎛ 두께로 형성되고, 상기 황동 도금층 성분 중 Fe 농도가 4% 미만인 금도금 스프링용 황동도금 강선에 의해서 달성된다.The above object of the present invention is achieved by a method for manufacturing a copper-plated steel sheet, in which a brass plating layer having a zinc content of 30 to 45% and a copper content of 55 to 70% is formed to a thickness of 0.5 to 2.0 m on the surface of a steel wire, This is achieved by a brass plated steel wire for a gold-plated spring.

상기 본 발명의 강선의 표면에 형성된 황동 하지 도금층은 아연 함유량이 30∼45%이고 구리 함유량이 55∼70%으로 제한되는바, 만일 구리 함유량이 55% 미만이거나 아연 함유량이 45%를 초과하게 되면 아연 함유량이 높아 색상이 미려하지 못하며 윤활특성이 상대적으로 양호한 구리성분의 함량이 상대적으로 줄어들어 신선성 및 스프링 성형성이 떨어지게 된다. 반대로 구리 함유량이 70%를 초과하거나 아연 함유량이 30% 미만으로 되면, 구리 함유량이 높아 변색의 우려가 있고 도금 작업시 작업성이 불리하게 된다.The brass bottom plating layer formed on the surface of the steel wire according to the present invention has a zinc content of 30 to 45% and a copper content of 55 to 70%. If the copper content is less than 55% or the zinc content exceeds 45% The zinc content is high and the color is not good and the content of the copper component having a relatively good lubrication property is relatively reduced, resulting in deterioration of freshness and spring formability. Conversely, if the copper content exceeds 70% or the zinc content is less than 30%, there is a risk of discoloration due to a high content of copper, and the workability in plating operation becomes disadvantageous.

본 발명의 금도금용 스프링에 제조에 사용되는 소재 강선의 화학조성은, 질량%로, C 0.50∼1.0%, Si 0.05∼0.50%, Mn 0.1∼1.5%, P 0.05% 이하, S 0.05% 이하이며, 잔부가 Fe 및 불가피한 불순물로 이루어지고, 인장강도가 1500∼4000MPa 범위 내인 것이 바람직하다.The chemical composition of the material steel wire used for manufacturing the gold-plated spring of the present invention is 0.50 to 1.0% of C, 0.05 to 0.50% of Si, 0.1 to 1.5% of Mn, 0.05% or less of S and 0.05% or less of S , The remainder being Fe and inevitable impurities, and a tensile strength within the range of 1500 to 4000 MPa.

본 발명의 금도금 스프링 황동도금 강선에서의 황동 도금층은 0.5∼2.0㎛ 두께가 바람직한바, 도금층의 두께가 0.5㎛ 미만으로 되면 스프링으로의 성형 후 템퍼링 열처리 공정을 거치면서 강선의 소지철과 산소의 반응으로 인해 표면에 산화철 피막이 형성되어 금도금이 불균일하게 형성될 가능성이 있고, 반대로 2.0㎛를 초과하게 되면 도금층이 불균일하게 형성되어 스프링 성형 시 툴 마크 발생 등 성형성에 불리하게 작용하게 된다.The brass plating layer of the gold-plated spring brass plated steel wire of the present invention preferably has a thickness of 0.5 to 2.0 탆. When the thickness of the plating layer is less than 0.5 탆, the steel is subjected to a tempering heat treatment process after being formed into a spring, There is a possibility that an iron oxide coating is formed on the surface to form a gold coating unevenly. On the contrary, if the thickness exceeds 2.0 μm, the plating layer is unevenly formed, which is disadvantageous for moldability such as generation of tool marks.

본 발명의 금도금 스프링용 황동도금 강선에서는 황동 도금층 내의 Fe 농도가 4% 이내로 유지되어야 만이, 이후의 스프링용 강선에 대한 스프링 성형에 이은 템퍼링 열처리 후에 황동 도금층과 금도금층 계면에서 산화철 피막이 발생하여 금도금층의 밀착력 저하 또는 박리가 발생하는 것이 방지되어 금도금 스프링에서 요구되는 품질특성에 부합하게 된다.In the brass plated steel wire for the gold-plated spring of the present invention, the Fe concentration in the brass plating layer should be maintained within 4%. After the spring forming for the steel wire for the subsequent spring, the iron oxide coating is formed at the interface between the brass plating layer and the gold- It is possible to prevent deterioration or peeling of adhesion of the gold plating spring to meet the quality characteristics required in the gold plating spring.

본 발명의 금도금 스프링용 황동도금 강선의 제조 공정은, 소재 와이어 로드를 2.0∼4.0mm 직경으로 1차 건식 신선하는 단계와, 1차 신선된 강선의 열처리에 이어 1.5∼3.5mm 직경으로 2차 건식 신선하는 단계와, 2차 신선된 강선의 표면에 구리 함유량이 55∼70%이고 아연 함유량이 30∼45%이 되도록 구리와 아연 도금층을 순차적으로 형성하여 2.0∼4.0㎛ 황동 도금층을 형성하는 단계와, 최종 선경이 0.01∼1.0㎜이고 황동 도금층의 두께가 0.5∼2.0㎛가 되도록 3차 신선하는 단계로 이루어진다.The manufacturing process of the brass plated steel wire for a gold-plated spring according to the present invention comprises a step of first dry-drawing a workpiece wire rod with a diameter of 2.0 to 4.0 mm, a step of heat- A step of forming a copper plating layer and a zinc plating layer successively on the surface of the secondary drawn steel wire so that the copper content is 55 to 70% and the zinc content is 30 to 45%, thereby forming a brass plating layer of 2.0 to 4.0 μm , And a third step of final drawing so that the final wire diameter is 0.01 to 1.0 mm and the thickness of the brass plating layer is 0.5 to 2.0 占 퐉.

상기 본 발명의 제조방법에서 신선선에 대한 황동도금 공정은, 연속적으로 공급되는 신선선이 염산조, 전해산세조 및 수세조를 순차적으로 통과하도록 하여 전처리가 이루어지도록 하고, 30 ∼ 70℃의 온도로 유지되고 황산구리 농도가 40∼60g/l인 전기구리도금 욕조 및 수세조를 통과시키고, 이어서 10 ∼ 40℃의 온도로 유지되고 아연 농도가 20∼100g/l인 전기아연도금 욕조를 통과시켜 구리도금층과 아연도금층이 순차적으로 형성되도록 한다. 다음으로 상기 구리와 아연도금층이 순차 형성된 강선을 500 ∼ 600℃ 온도의 확산조를 침지시간이 3∼5초가 되도록 통과시켜 구리와 아연의 확산을 통한 황동 도금층의 생성이 유도되도록 한 후 수세조 및 건조로를 거쳐 권취기에 권취시킴으로써 2.0∼4.0㎛ 두께의 황동 도금층이 피복된 강선이 얻어지게 된다.In the manufacturing method of the present invention, the brass plating process for the fresh wire is performed such that the fresh wire continuously supplied is passed through the hydrochloric acid bath, the electrolytic acid bath and the water bath in sequence, and the pre- And passed through an electroplating bath and a water bath having a copper sulfate concentration of 40 to 60 g / l, followed by passing through an electro-galvanizing bath maintained at a temperature of 10 to 40 ° C and a zinc concentration of 20 to 100 g / l, So that a plating layer and a zinc plating layer are sequentially formed. Next, the steel wire in which the copper and zinc plating layers are sequentially formed is passed through a diffusion bath at a temperature of 500 to 600 ° C for 3 to 5 seconds so as to induce generation of a brass plating layer through diffusion of copper and zinc, And then wound on a winder through a drying furnace to obtain a steel wire coated with a brass plating layer having a thickness of 2.0 to 4.0 탆.

한편, 상기 금도금 스프링용 황동도금 강선의 제조방법에서, 3차 신선 공급선의 황동 도금층 두께는 2.0∼4.0㎛ 범위가 바람직한바, 4.0㎛를 초과하게 되면불균일한 도금층으로 형성될 가능성이 높고, 반대로 2.0㎛ 미만의 두께로 되면 신선성과 스프링 성형성에 불리하다.   On the other hand, in the above-described method for manufacturing a brass plated steel wire for a gold-plated spring, the thickness of the brass plating layer of the third fresh wire is preferably in the range of 2.0 to 4.0 mu m. When the thickness is more than 4.0 mu m, If the thickness is less than 탆, the freshness and the spring formability are disadvantageous.

본 발명의 금도금 스프링용 황동도금 강선은 그 표면에 형성된 황동 도금층이 신선 및 스프링 성형시 윤활특성을 발휘하여 신선성과 성형성이 향상되고, 황동 도금층 내에 낮게 유지된 Fe 농도에 기인하여 황동 도금층과 금도금층 사이에 밀착력이 강화되어 스프링 사용중에 도금층이 박리되는 것이 방지되는 효과가 있다.The brass plated steel wire for a gold-plated spring according to the present invention exhibits lubrication characteristics during drawing and spring forming of the brass-plated steel wire for its surface to improve the freshness and formability, and the brass plating layer and the gold plating The adhesion between the layers is strengthened and the plating layer is prevented from being peeled off during the use of the spring.

그리고, 본 발명의 금도금 스프링용 황동도금 강선의 제조방법에서는, 소재 강선의 신선 중에 형성된 황동 도금층이 이후의 신선 및 스프링 성형 후 금도금 공정에서 윤활피막 및 하지도금층으로서의 역할을 함에 따라 종래 금도금 스프링 제조 공정에서 필요로 하는 피막 형성 및 제거 공정과 하지도금 공정이 배제됨으로써 금도금을 행하여 제조공정의 단순화에 따른 생산성 향상 및 제조비용의 절감을 꾀할 수 있는 장점이 있다.Further, in the method of manufacturing a brass plated steel wire for a gold-plated spring according to the present invention, since a brass plating layer formed in the drawing of a material steel wire serves as a lubricant film and a base plating layer in a subsequent gold plating process after drawing and spring forming, The plating film forming and removing step and the base plating step which are required in the plating step and the plating step are excluded so that the gold plating is performed to improve the productivity and the manufacturing cost according to the simplification of the manufacturing process.

본 발명에 따른 금도금 스프링용 황동도금 강선의 특징적인 기술적 구성과 구체적인 제조 공정은 다음의 실시예를 통해서 보다 명확하게 이해될 것이다.The characteristic technical structure and specific manufacturing process of the brass plated steel wire for the gold plating spring according to the present invention will be more clearly understood through the following examples.

먼저, 소재 와이어 로드로서, 5.5mm 선경을 갖는 질량%로, C 0.50∼1,0%, Si 0.05∼0.50%, Mn 0.1∼1,5%, P 0.05% 이하, S 0.05% 이하이며, 잔부가 Fe 및 불가피한 불순물로 이루어진 화학조성 범위 내의 로드를 마련하였다.First, as the material wire rod, 0.50 to 1.0% of C, 0.05 to 0.50% of Si, 0.1 to 1.5% of Mn, 0.05% or less of P and 0.05% or less of S are contained in mass% Additional Fe and unavoidable impurities were provided in the chemical composition range.

상기 소재 와이어 로드를 건식 연속 신선기로 통과시켜 1차 냉간 신선이 이루어지도록 하였다. 1차 냉간 신선된 선경이 2.0∼4.0mm 로 감소된 강선을 권취기에 권취시켰다. 상기 1차 신선된 강선을 가열로와 납 냉각조에 통과시켜 열처리(패턴팅)가 이루어지도록 하고, 후속적으로 산세, 피막형성 및 건조 공정을 거치도록 하는 일련의 열처리 과정 후에 권취기에 권취시켰다.The material wire rod was passed through a dry continuous drawing machine to perform primary cold drawing. The steel wire whose primary cold drawn wire diameter was reduced to 2.0 to 4.0 mm was wound on a winder. The first drawn wire was passed through a heating furnace and a lead cooling bath to perform a heat treatment (patterning), and was wound on a winder after a series of heat treatment processes in which a pickling, film forming and drying process were subsequently carried out.

후속 공정으로서, 상기 열처리된 강선을 다수 대의 신선 다이스가 배열된 건식 신선기로 공급하여 선경이 0.5∼1.5mm로 감소되도록 하여 권취기에 권취시켰다.As a subsequent step, the heat-treated steel wire was supplied to a dry type drawing machine in which a plurality of fresh dies were arranged, and the wire diameter was reduced to 0.5 to 1.5 mm, and the wire was wound on a winder.

다음은 도금 공정으로서, 상기 권취된 와이어가 염산조, 전해산세조, 수세조를 차례로 거치면서 전처리되도록 한 후, 전기구리도금 욕조, 수세조, 전기아연도금 욕조를 거치도록 하여 구리도금층과 아연도금층이 순차적으로 형성되도록 한 후에 확산조를 통과시켜서 두께 4㎛이하 두께의 황동 도금층이 형성되도록 하였다.Next, in the plating process, the wound wire is pretreated by passing through a hydrochloric acid bath, a electrolytic bath, and a water bath in order, and then the electrolytic copper plating bath, the water bath, and the galvanizing bath are passed through to form a copper plating layer and a zinc plating layer Were sequentially formed, and then passed through a diffusion bath to form a brass plated layer having a thickness of 4 탆 or less.

이어서, 상기 황동도금된 강선을 다수 대의 신선 다이스가 배열된 신선기를 통과시켜 최종 선경이 0.01∼1.0mm 이고, 도금층의 두께가 0.5∼2.0㎛ 이며, 인장강도가 1500∼4000MPa인 금도금 스프링용 황동도금 강선을 제조하였다.Then, the brass plated steel wire was passed through a drawing machine having a plurality of fresh dies arranged to form a brass plating for a gold plating spring having a final wire diameter of 0.01 to 1.0 mm, a thickness of the plating layer of 0.5 to 2.0 탆, and a tensile strength of 1500 to 4000 MPa A steel wire was manufactured.

상기의 제조 공정을 통해서 얻어진 금도금 스프링용 황동도금 강선을 이용하여 스프링 성형을 한 후 템퍼링 열처리를 하고 전해탈지 및 염산산세의 전처리를 거쳐 0.05∼0.15㎛ 두께로 금도금을 하여 최종적으로 금도금된 스프링을 제작하였다. The spring-formed brass plated steel wire for the gold plating spring obtained through the above manufacturing process is subjected to tempering heat treatment, pre-treated with electrolytic degreasing and hydrochloric acid pickling, and then subjected to gold plating to a thickness of 0.05 to 0.15 μm to finally produce a gold- Respectively.

상기와 같은 제조공정을 통해서 금도금된 스프링 시편을 제작함에 있어서, 황동 도금층 중의 구리 함유량이 65%이고 아연 함유량이 35%인 경우에서 도금층의 Fe 농도에 따른 황동하지 도금층과 금도금층 사이의 밀착력과 금도금 후의 외관에 대한 관찰을 행하였던 바, 그 결과는 아래의 표1과 같다. 이때 황동 도금층의 Fe 농도는 오제(Auger) 분석기를 이용하여 도금층 0.013㎛ 깊이에서 성분 분석한 결과이다.In the case of producing the gold-plated spring specimen through the above-described manufacturing process, in the case where the copper content in the brass plating layer is 65% and the zinc content is 35%, the adhesion between the brass bottom plating layer and the gold plating layer according to the Fe concentration of the plating layer, The results are shown in Table 1 below. At this time, the Fe concentration of the brass plated layer is the result of component analysis at a depth of 0.013 μm of the plating layer using an Auger analyzer.

황동 도금층 중의 Fe 농도에 따른 도금 밀착성과 외관        Plating adhesion and appearance according to Fe concentration in brass plating layer 구 분       division 실시예1Example 1 실시예2Example 2 실시예3Example 3 비교예1Comparative Example 1 비교예2Comparative Example 2 비교예3Comparative Example 3 시험
조건exam
Condition 도금층 Fe 농도(%)Plated layer Fe concentration (%) 00 22 0404 66 88 1010 Cu(%)Cu (%) 6565 6565 6565 6565 6565 6565 Zn(%)Zn (%) 35    35 35   35 35   35 35   35 35   35 35   35 시험결과Test result 밀착력Adhesion 우수Great 우수Great 우수Great 보통usually 나쁨Poor 나쁨Poor 외관Exterior 우수Great 우수Great 우수Great 보통usually 나쁨Poor 나쁨Poor

위의 표1에서와 같이, 황동 도금층 내의 Fe 농도가 본 발명의 범위, 즉 4% 이내를 벗어나서 그 보다 큰 농도를 보인 비교예1 내지 3 시편의 경우에는 외관 품질과 도금밀착성이 불량한 것으로 관찰되었다.
As shown in Table 1, in the case of the specimens of Comparative Examples 1 to 3, in which the Fe concentration in the brass plating layer was within the range of the present invention, that is, within the range of 4% or less, .

Claims (4)

강선의 표면에 아연 함유량이 30∼45%이고 구리 함유량이 55∼70%인 황동 도금층이 0.5∼2.0㎛ 두께로 형성되고, 상기 황동 도금층 성분 중 Fe 농도가 4% 이내인 것을 특징으로 하는 금도금 스프링용 황동도금 강선. Wherein a brass plating layer having a zinc content of 30 to 45% and a copper content of 55 to 70% on the surface of the steel wire is formed to a thickness of 0.5 to 2.0 탆, and a Fe concentration in the brass plating layer component is within 4% Brass plated steel wire for. 제1항에 있어서, 상기 강선의 화학조성은, 질량%로 C 0.50∼1,0%, Si 0.05∼0.50%, Mn 0.1∼1,5%, P 0.05% 이하, S 0.05% 이하이며, 잔부가 Fe 및 불가피한 불순물로 이루어짐을 특징으로 하는 금도금 스프링용 황동도금 강선.  The steel wire according to claim 1, wherein the chemical composition of the steel wire is 0.50 to 1.0% of C, 0.05 to 0.50% of Si, 0.1 to 1.5% of Mn, 0.05% or less of P and 0.05% And the additional iron and unavoidable impurities. The brass plated steel wire for a gold-plated spring. 소재 와이어 로드를 2.0∼4.0mm 직경으로 1차 건식 신선하는 단계와, 1차 신선된 강선의 열처리에 이어 0.5∼1.5mm 직경으로 2차 건식 신선하는 단계와, 2차 신선된 강선의 표면에 구리 함유량이 55∼70%이고 아연 함유량이 30∼45%이 되도록 구리와 아연 도금층을 순차적으로 형성하고 열확산으로 2.0∼4.0㎛ 황동 도금층을 형성하는 단계와, 최종 선경이 0.01∼1.0㎜이고 황동 도금층의 두께가 0.5∼2.0㎛가 되도록 3차 신선하는 단계로 이루어짐을 특징으로 하는 금도금 스프링용 황동도금 강선의 제조방법.  A step of first dry-drawing the material wire rod with a diameter of 2.0 to 4.0 mm, a step of secondarily dry-drawing the wire rod with a diameter of 0.5 to 1.5 mm following the heat treatment of the first-drawn steel wire, Forming a copper and zinc plating layer sequentially so that the content is 55 to 70% and the zinc content is 30 to 45%, and forming a brass plating layer of 2.0 to 4.0 mu m by thermal diffusion; and a step of forming a brass plating layer having a final wire diameter of 0.01 to 1.0 mm And a third step of drawing the brass plated steel wire to a thickness of 0.5 to 2.0 占 퐉. 제3항에 있어서, 상기 황동 도금층 성분 중 Fe 농도가 4% 이내인 것을 특징으로 하는 금도금 스프링용 황동도금 강선의 제조방법.

The method for manufacturing a brass plated steel wire for a gold plating spring according to claim 3, wherein the Fe concentration in the brass plating layer component is within 4%.

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