EP0608466B1 - Steel wire for automatic coiling and production process thereof - Google Patents

Steel wire for automatic coiling and production process thereof Download PDF

Info

Publication number
EP0608466B1
EP0608466B1 EP93107018A EP93107018A EP0608466B1 EP 0608466 B1 EP0608466 B1 EP 0608466B1 EP 93107018 A EP93107018 A EP 93107018A EP 93107018 A EP93107018 A EP 93107018A EP 0608466 B1 EP0608466 B1 EP 0608466B1
Authority
EP
European Patent Office
Prior art keywords
weight
steel wire
wire
less
plating
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.)
Revoked
Application number
EP93107018A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0608466A1 (en
Inventor
Susumu C/O Itami Works Of Yamamoto
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=12427710&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0608466(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0608466A1 publication Critical patent/EP0608466A1/en
Application granted granted Critical
Publication of EP0608466B1 publication Critical patent/EP0608466B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C9/00—Cooling, heating or lubricating drawing material

Definitions

  • the present invention relates to a steel wire for automatic coiling and a production process thereof.
  • a wire obtained by drawing a stainless steel wire having Ni (nickel) plating on the surface thereof has been used for improving the lubricating property at the drawing step and the subsequent steps such as a coiling step.
  • Ni nickel
  • Such a conventional wire having Ni plating is excellent in various points as compared to a conventional surface-coated wire such as lead-plated wires and wires treated with oxalates.
  • the stainless steel wire is inferior in the heat conductivity, has a toughness, and shows severe work hardening, the stainless steel wire is inferior to carbon steel wire in workability upon drawing and workability in the subsequent steps. Accordingly, the stainless steel wire has disadvantages in that the lubricating property upon drawing is insufficient, the working speed in the subsequent step (e.g., a coiling step) is insufficient, and there is difficulties in constantly obtaining products having a uniform shape.
  • An object of the present invention is to provide a process for producing a steel wire for automatic coiling which has an excellent lubricating property in a drawing step and subsequent steps.
  • Another object of the present invention is to provide a steel wire for automatic coiling having an excellent lubricating property in a drawing step and subsequent steps.
  • the present invention relates to a process of producing a steel wire for automatic coiling, said process comprising the steps of:
  • the present invention also relates to a steel wire for automatic coiling comprising a steel wire containing
  • the surface roughness of the steel wire after the final drawing is from 0.8 s (0.6 to 0.9 ⁇ m) to 12 s (9 to 15 ⁇ m) according to JIS B601 and B659.
  • the surface roughness of the starting wire and the plating conditions composition and pH of plating solution, temperature, electrical current, stirring, etc.
  • the thickness of the Ni plating before drawing is from 1 to 5 ⁇ m, and preferably about 3 ⁇ m. If it is too thick, the strength of the wire is reduced.
  • Examples of the synthetic resin containing a halogen include polyethylene chloride, polytrifluorochloroethylene and polytetrafluoroethylene.
  • the method for coating the synthetic resin on the wire is not particularly limited, and a dip coating method is preferably employed because of easiness of operation.
  • the thickness of the synthetic resin coated layer preferably from 0.1 to 1 ⁇ m after drawing.
  • a die used for drawing the wire is not particularly limited, and examples thereof include WC alloy dies, diamond dies and sintered diamond dies, each having a die angle of from 12 to 15°.
  • the conditions of drawing are not particularly limited as long as the reduction of cross-sectional area is at least 60%, preferably from 75 to 85%, with adjusting the surface roughness thereof in the range of from 0.8 to 12 s.
  • the drawing speed is generally from 300 to 1,000 m/min.
  • a lubricant is generally used when the wire is drawn.
  • a lubricant mainly composed of calcium stearate containing molybdenum disulfide and lime is generally used as a lubricant.
  • the thickness of the Ni plating after drawing i.e., that of the steel wire for automatic coiling of the present invention, is from 0.3 to 1.7 ⁇ m, and preferably about 1 ⁇ m.
  • the steel wire of the present invention is used for a spring, it is necessary that the tensile strength thereof is at least 160 kgf/mm 2 .
  • the stainless steel wires used were ATST 304, 316, and 631 and the compositions thereof are shown in Table 1 below. The content of the ingredient in Table 1 are shown in terms of percent by weight. The balance was iron.
  • Sample D Comparative Example
  • Sample D was obtained by applying electrolytic polishing to the steel wire after providing Ni plating to reduce the surface roughness.
  • Each sample was drawn to a wire having a diameter of 1.0 mm and the life of the final die and the surface roughness of the wire after drawing were determined.
  • the drawing was carried out by a straight type continuous wire drawing machine using alloy dies and a calcium stearate lubricant.
  • the life of the die shown in Table 3 was the life of the final die at the drawing speed of 400 m/min.
  • Sample E Comparative Example
  • the surface was greatly roughened after the wire elongation and hence the steel wire is unsuitable in appearance for use as a high quality stainless steel material.
  • the ratio of the actual free length to the target free length of a spring is called "free length ratio" and the quality of a spring is determined by the free length ratio of the spring.
  • the free length ratio is allowable ⁇ 0.1% for a precise spring and ⁇ 0.05% for a super precise spring.
  • the percent defective of the above-produced springs for precise spring and super precise spring are shown in Table 5.
  • the friction resistance between a die and the wire upon drawing can be reduced and the life of the die can be prolonged.
  • the wire of the present invention since the friction resistance between a bending die and the wire can be reduced, and a lubricant enters the concaved portions on the surface of the wire, the lubricating property of the wire is increased and the coiling speed can be increased.
  • springs having a uniform shape, such as free length can constantly obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Electroplating Methods And Accessories (AREA)
EP93107018A 1993-01-29 1993-04-29 Steel wire for automatic coiling and production process thereof Revoked EP0608466B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP34922/93 1993-01-29
JP5034922A JPH06226330A (ja) 1993-01-29 1993-01-29 自動コイリング用鋼線及びその製造方法

Publications (2)

Publication Number Publication Date
EP0608466A1 EP0608466A1 (en) 1994-08-03
EP0608466B1 true EP0608466B1 (en) 1996-07-03

Family

ID=12427710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107018A Revoked EP0608466B1 (en) 1993-01-29 1993-04-29 Steel wire for automatic coiling and production process thereof

Country Status (7)

Country Link
EP (1) EP0608466B1 (enrdf_load_stackoverflow)
JP (1) JPH06226330A (enrdf_load_stackoverflow)
CN (1) CN1099320A (enrdf_load_stackoverflow)
DE (1) DE69303465T2 (enrdf_load_stackoverflow)
GB (1) GB2274613B (enrdf_load_stackoverflow)
HK (1) HK65296A (enrdf_load_stackoverflow)
TW (1) TW242586B (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2836607B2 (ja) * 1996-08-29 1998-12-14 住友電気工業株式会社 ステンレス鋼線及びその製造方法
FR2774671B1 (fr) * 1998-02-12 2000-03-17 Birambeau Perfectionnement aux meches de tire-bouchon
WO2005080624A1 (en) * 2004-02-13 2005-09-01 Nv Bekaert Sa Steel wire with metal layer and roughnesses
SE534779C2 (sv) * 2010-03-03 2011-12-20 Sandvik Intellectual Property Metod för att tillverka en trådprodukt av rostfritt stål
FR2963851B1 (fr) 2010-08-11 2017-04-21 Soc De Tech Michelin Procede de fabrication d'une antenne pour un dispositif electronique d'un pneumatique
FR2963852B1 (fr) 2010-08-11 2013-10-11 Soc Tech Michelin Antenne pour un dispositif electronique d'un pneumatique
WO2016195293A1 (ko) * 2015-05-29 2016-12-08 삼경금속 주식회사 듀플렉스 스테인레스 강
CN112210806B (zh) * 2020-08-13 2021-10-08 法尔胜泓昇集团有限公司 一种具有二硫化钼涂层的防腐钢丝及其制备工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3321944A (en) * 1964-12-31 1967-05-30 Air Reduction Surface finish for continuous electrode
GB1196013A (en) * 1967-09-19 1970-06-24 Ici Ltd Method of Drawing Wire
FR2194195A5 (enrdf_load_stackoverflow) * 1972-07-28 1974-02-22 Creusot Loire
FR2279488A1 (fr) * 1974-07-24 1976-02-20 Ugine Kuhlmann Procede de mise en oeuvre a froid des aciers inoxydables
DD148012A1 (de) * 1979-12-20 1981-05-06 Harri Weinhold Verfahren zum nassziehen von draht
JPS62200605A (ja) * 1986-02-27 1987-09-04 古河電気工業株式会社 耐加工性絶縁電線
JPH05329683A (ja) * 1991-12-03 1993-12-14 Kobe Steel Ltd ワイヤ送給及び伸線用潤滑剤

Also Published As

Publication number Publication date
GB2274613B (en) 1995-11-29
EP0608466A1 (en) 1994-08-03
GB9401743D0 (en) 1994-03-23
DE69303465T2 (de) 1996-10-31
TW242586B (enrdf_load_stackoverflow) 1995-03-11
JPH06226330A (ja) 1994-08-16
DE69303465D1 (de) 1996-08-08
HK65296A (en) 1996-04-26
CN1099320A (zh) 1995-03-01
GB2274613A (en) 1994-08-03

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